Power control method and device of power system, power system, storage medium and program product

Abstract

The invention discloses a power control method and device of a power system, the power system, a storage medium and a program product, and belongs to the field of power systems. The power control method of the electric power system comprises the steps that a first control module obtains a direct current side power response expected value corresponding to target electric power conversion equipment in at least one electric power conversion equipment; determining a target alternating current signal corresponding to the target power conversion equipment according to a direct current side power response expected value corresponding to the target power conversion equipment, the actual electric signal of the alternating current coupling point and a first electric signal reference value of the alternating current coupling point; and based on the target alternating current signal, controlling the working state of the target power conversion equipment so as to adjust the power supply relationship between the power conversion equipment. According to the power control method of the electric power system, each electric power conversion device can reach a balance state.

Description

Technical Field

[0001] The present application belongs to the field of power systems, and in particular, relates to a power control method, device, power system, storage medium and program product of a power system. Background Art

[0002] With the development of renewable energy technology, photovoltaic equipment, energy storage equipment, photoelectric storage equipment, and AC / DC charging equipment have been widely used. However, with the increase in the types and number of controllable devices, the freedom and constraints of system control have increased accordingly, and the complexity of energy scheduling has also increased exponentially. In the related technology, for off-grid operation scenarios, the commonly used energy scheduling method is mainly to enumerate each scenario to determine the current operating status of each device, and then allocate power on this basis; this method needs to list all scenarios, with low energy utilization, low control efficiency and high complexity. It is difficult to include various boundary conditions and is not real-time, which affects the scheduling effect and the accuracy and economy of energy scheduling of the power system in off-grid operation scenarios. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a power control method, device, power system, storage medium and program product of a power system, so that each power conversion device reaches a balanced state.

[0004] In a first aspect, the present application provides a power control method for an electric power system, wherein the electric power system comprises at least one electric power conversion device and a first control module electrically connected to the electric power conversion device, wherein each of the electric power conversion devices is respectively connected to an AC coupling point; each of the electric power conversion devices comprises a first converter and at least one DC module, wherein the electric power conversion device is used to be connected to an external device via the AC coupling point; each of the DC modules in the same electric power conversion device is respectively connected to the first converter via a DC coupling point; the method comprises: The first control module obtains an expected DC side power response value corresponding to a target power conversion device in the at least one power conversion device; Determine a target AC electric signal corresponding to the target power conversion device according to an expected value of a DC side power response corresponding to the target power conversion device, an actual electric signal at the AC coupling point, and a first electric signal reference value at the AC coupling point; Based on the target AC power signal, the working state of the target power conversion device is controlled to adjust the power supply relationship between the power conversion devices.

[0005] According to the power control method of the power system of the present application, the target AC signal for adjusting the first converter of the power conversion device is determined by the expected value of the DC side power response corresponding to the target power conversion device and the first electrical signal reference value of the AC coupling point to control the first converter, so as to adjust the power supply relationship between the power conversion devices so that the power conversion devices reach a balanced state.

[0006] In a second aspect, the present application provides a power control device for an electric power system, wherein the electric power system comprises at least one electric power conversion device, each of which is respectively connected to an AC coupling point; each of the electric power conversion devices comprises a first converter and at least one DC module, and the electric power conversion device is used to be connected to an external device via the AC coupling point; each of the DC modules in the same electric power conversion device is respectively connected to the first converter via a DC coupling point; the device comprises: A first processing module, configured to obtain an expected DC side power response value corresponding to a target power conversion device in the at least one power conversion device; A second processing module, configured to determine a target AC electric signal corresponding to the target power conversion device according to an expected DC side power response value corresponding to the target power conversion device, an actual electric signal at the AC coupling point, and a first electric signal reference value at the AC coupling point; The third processing module is used to control the working state of the target power conversion device based on the target AC power signal to adjust the power supply relationship between the power conversion devices.

[0007] According to the power control device of the power system of the present application, the target AC signal for adjusting the first converter of the power conversion device is determined by the expected value of the DC side power response corresponding to the target power conversion device and the first electrical signal reference value of the AC coupling point to control the first converter, so as to adjust the power supply relationship between the power conversion devices so that the power conversion devices reach a balanced state.

[0008] In a third aspect, the present application provides a power system, comprising: a first control module; At least one power conversion device, each of the power conversion devices is connected to an AC coupling point; each of the power conversion devices includes a first converter and at least one DC module, and the power conversion device is used to connect to an external device via the AC coupling point; each of the DC modules is connected to the first converter via a DC coupling point, and the first control module is connected to each of the first converters; The electric power system operates according to the power control method for the electric power system as described in the first aspect.

[0009] In a fourth aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the power control method of the power system as described in the first aspect above.

[0010] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the power control method of the power system as described in the first aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 It is one of the flow charts of the power control method of the power system provided in the embodiment of the present application; Figure 2 It is one of the structural schematic diagrams of the power system provided in the embodiment of the present application; Figure 3 This is the second structural diagram of the power system provided in the embodiment of the present application; Figure 4 This is the third structural diagram of the power system provided in the embodiment of the present application; Figure 5 This is a second flow chart of a power control method for a power system provided in an embodiment of the present application; Figure 6 This is a third flow chart of a power control method for an electric power system provided in an embodiment of the present application; Figure 7 This is a fourth flow chart of a power control method for an electric power system provided in an embodiment of the present application; Figure 8 This is the fourth structural diagram of the power system provided in the embodiment of the present application; Fig. 9 It is one of the result schematic diagrams of the power control method of the power system provided in the embodiment of the present application; Fig.10 This is the second result schematic diagram of the power control method of the power system provided in the embodiment of the present application; Fig.11 This is the third result schematic diagram of the power control method of the power system provided in the embodiment of the present application; Fig.12 This is the fourth result schematic diagram of the power control method of the power system provided in the embodiment of the present application; Fig.13 This is the fifth result schematic diagram of the power control method of the power system provided in the embodiment of the present application; Fig.14This is the sixth result schematic diagram of the power control method of the power system provided in the embodiment of the present application; Fig.15 This is the seventh result schematic diagram of the power control method of the power system provided in the embodiment of the present application; Fig.16 This is the eighth result schematic diagram of the power control method of the power system provided in the embodiment of the present application; Fig.17 This is the ninth result schematic diagram of the power control method of the power system provided in the embodiment of the present application; Fig.18 This is the tenth result schematic diagram of the power control method of the power system provided in the embodiment of the present application; Fig.19 This is the eleventh result schematic diagram of the power control method of the power system provided in the embodiment of the present application; Fig. 20 This is the twelfth result schematic diagram of the power control method of the power system provided in the embodiment of the present application; Fig.21 This is the thirteenth result schematic diagram of the power control method of the power system provided in the embodiment of the present application; Fig. 22 is a schematic diagram of the structure of a power control device for an electric power system provided in an embodiment of the present application; Fig.23 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0013] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0014] In the following, in combination with the accompanying drawings, the power control method of the power system, the power control device of the power system, the electronic device and the readable storage medium provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0015] The power control method of the electric power system may be applied to a terminal, and may be specifically executed by hardware or software in the terminal.

[0016] In the following various embodiments, a terminal including a display and a touch-sensitive surface is described. However, it should be understood that the terminal may include one or more other physical user interface devices such as a physical keyboard, a mouse and a joystick.

[0017] The power control method for an electric power system provided in an embodiment of the present application, the execution subject of the power control method for an electric power system may be an electronic device or a functional module or functional entity in an electronic device that can implement the power control method for an electric power system. The electronic devices mentioned in the embodiment of the present application include but are not limited to mobile phones, tablet computers, computers, cameras, and wearable devices, etc. The power control method for an electric power system provided in an embodiment of the present application is described below using an electronic device as an example of the execution subject.

[0018] like Figure 1 As shown, the power control method of the power system includes: step 110, step 120 and step 130.

[0019] The power control method of the power system can be applied to off-grid operation scenarios.

[0020] Step 110: obtaining an expected DC side power response value corresponding to a target power conversion device in at least one power conversion device; In this step, the power system includes at least one power conversion device, and each power conversion device is connected to an AC coupling point, such as Figure 2 As shown in point A.

[0021] Each power conversion device includes a first converter and at least one DC module. The first converter is connected to the DC module. The power conversion device is used to be connected to an external device via an AC coupling point.

[0022] The external device may be an electrical device, such as an electrical load; or may be a third-party power generation device, such as a third-party inverter or a power generation load.

[0023] like Figure 4 As shown, each DC module in the same power conversion device is connected to the first converter via a DC coupling point B respectively.

[0024] In some embodiments, the DC module may include a DC converter and power generation equipment, power consumption equipment or energy storage equipment connected to the DC converter, wherein the power generation equipment may be photovoltaic equipment, wind power generation equipment or other new energy power generation equipment, power consumption equipment may be charging piles, and energy storage equipment may be energy storage batteries.

[0025] Different from the categories of devices connected to DC converters, DC modules also have multiple corresponding categories. The categories of DC modules can be: power generation equipment, power consumption equipment or energy storage equipment, etc.

[0026] The categories of the DC modules included in the power conversion equipment are different, and their own categories may also be different. It can be understood that the power conversion equipment can be a pure storage module, a pure optical module, a photovoltaic storage module, a photovoltaic storage and charging module or other combination modules, etc., which can be specifically set according to actual needs, and this application does not limit it here; for example, when the power conversion equipment includes a first converter and one or more photovoltaic devices, the power conversion equipment is a pure optical module; when the power conversion equipment includes a first converter and one or more energy storage devices, the power conversion equipment is a pure storage module; when the power conversion equipment includes a first converter, a photovoltaic device and an energy storage device, the power conversion equipment can be a photovoltaic storage module.

[0027] The target power conversion device may be any device among all the power conversion devices included in the power system.

[0028] The expected value of the DC side power response corresponding to the target power conversion device is the expected response power corresponding to the target power conversion device at the DC coupling point. In the following, Px_dc represents the expected value of the DC side power response of the x-th power conversion device, and x is a positive integer. It can be understood that the expected values ​​of the DC side power response corresponding to different power conversion devices may be the same or different; the expected values ​​of the DC side power response of the same power conversion device at different times may also be different.

[0029] The expected value of the DC side power response corresponding to the target power conversion device may be expressed as the sum of the expected values ​​of the sub-DC side power responses corresponding to the DC modules included in the target power conversion device.

[0030] In some embodiments, step 110 may include: Determine the expected value of the sub-DC side power response corresponding to each DC module according to the type of each DC module included in the target power conversion device; Based on the sum of the expected values ​​of the sub-DC side power responses corresponding to each DC module, the expected value of the DC side power response corresponding to the target power conversion device is determined.

[0031] In this embodiment, the categories of DC modules may include: energy storage equipment, power generation equipment, and power consumption equipment, etc.

[0032] An electric power conversion device may include one DC module or multiple DC modules. The multiple DC modules included may be DC modules of the same category, such as pure storage modules or pure power generation equipment, etc.; the multiple DC modules included may also be DC modules of different categories, such as energy storage + power generation equipment, energy storage + power consumption equipment, power generation + power consumption equipment, and energy storage + power generation + power consumption equipment, etc.

[0033] When calculating the expected value of the DC side power response corresponding to the target power conversion device, the expected value of the sub-DC side power response corresponding to each DC module included therein should be calculated first, and then the expected values ​​of the sub-DC side power responses should be summed. It should be noted that the sub-DC side power response expected value and the DC side power response expected value are both vectors, including magnitude and direction, where the discharge direction is positive and the charging direction is negative.

[0034] For different types of DC modules, the methods for determining the corresponding expected values ​​of the sub-DC side powers are different.

[0035] In some embodiments, the expected value of the sub-DC side power response corresponding to the DC module can be determined based on at least one of the type of the DC module, the performance parameters of the DC module, the power scheduling of the DC module, and the charging request power corresponding to the DC module.

[0036] In this embodiment, the category of each DC module can be determined first, and then the corresponding calculation method can be selected according to the category. In some embodiments, when calculating the expected value of the sub-DC side power response, the first AC side scheduling parameter value must also be comprehensively considered. The first AC side scheduling parameter value is determined based on the actual electrical signal of the AC coupling point and the first electrical signal reference value. The specific determination method will be described in the following embodiments and will not be elaborated here.

[0037] In some embodiments, according to the types of the DC modules included in the target power conversion device, determining the expected sub-DC side power response value corresponding to each DC module may include: In the case where the DC module is a power generation device, the maximum power generation corresponding to the power generation device is determined as the expected value of the sub-DC side power response corresponding to the power generation device; In the case where the DC module is an electric device, the charging request power corresponding to the electric device is determined as the sub-DC side power response expected value corresponding to the electric device; In the case where the DC module is an energy storage device, the expected value of the sub-DC side power response corresponding to the energy storage device is determined according to the types of other DC modules connected to the energy storage device and the first AC side scheduling parameter value.

[0038] In this embodiment, when the DC module is a power generation device, the expected value of the sub-DC side power response is the maximum power expected to be output, that is, the maximum power generation power, which is a positive value; taking the photovoltaic module as an example, it can be the expected maximum photovoltaic power output.

[0039] In the case where the DC module is an electrical device, such as a charging pile, the expected value of the sub-DC side power response may be a charging request power of the electrical device connected to the charging pile, and the charging request power is a negative value.

[0040] In the case where the DC module is an energy storage device, the expected value of the sub-DC side power response can be the energy storage scheduling power expected to respond within the allowable range of the performance parameters and under balanced distribution, which can be specifically determined according to the types of other DC modules connected to the energy storage device and the first AC side scheduling parameter value.

[0041] In some embodiments, when the DC module is an energy storage device, determining the expected value of the sub-DC side power response corresponding to the energy storage device according to the types of other DC modules connected to the energy storage device and the first AC side scheduling parameter value may include: When all other DC modules connected to the energy storage device are energy storage devices, or there are no other devices connected to the energy storage device, determine the expected value of the sub-DC side power response corresponding to the energy storage device according to the absolute value of the maximum charge and discharge power corresponding to the energy storage device, the absolute value of the first AC side scheduling parameter value, and the charge and discharge state corresponding to the maximum charge and discharge power; In the case where the other DC modules connected to the energy storage device include at least one of a power generation device and a power consumption device, determining the energy storage scheduling power corresponding to the energy storage device according to the first AC side scheduling parameter value and the expected value of the sub-DC side power response corresponding to each target module; Based on the energy storage dispatching power corresponding to the energy storage device, the charging and discharging state corresponding to the energy storage dispatching power, and the maximum charging and discharging power corresponding to the energy storage device, the expected value of the sub-DC side power response corresponding to the energy storage device is determined.

[0042] In this embodiment, the target module is a power generation device and / or a power consumption device connected to the energy storage device. The expected value of the sub-DC side power response corresponding to the power generation device is the maximum power generation power, and the expected value of the sub-DC side power response corresponding to the power consumption device is the charging request power.

[0043] When the target power conversion device is a pure storage device, the expected value of the sub-DC side power response corresponding to the energy storage device can be determined based on the absolute value of the maximum charge and discharge power corresponding to the energy storage device, the absolute value of the first AC side scheduling parameter value, and the charge and discharge state corresponding to the maximum charge and discharge power.

[0044] If the absolute value of the maximum charge and discharge power is less than the absolute value of the first AC side scheduling parameter value, the expected value of the sub-DC side power response should be determined as the maximum charge and discharge power; if the absolute value of the maximum charge and discharge power is greater than the absolute value of the first AC side scheduling parameter value, the expected value of the sub-DC side power response should be determined as the first AC side scheduling parameter value.

[0045] In the case where the target power equipment is a hybrid module of energy storage equipment and other types of equipment, it should be comprehensively determined in combination with the first AC side scheduling parameter value.

[0046] It can be understood that, for a hybrid module including an energy storage device, the energy storage scheduling power = the first AC side scheduling parameter value + the expected sub-DC side power response value corresponding to each target module; wherein the expected sub-DC side power response value corresponding to each target module may be positive or negative.

[0047] After obtaining the energy storage dispatch power, the expected value of the sub-DC side power response corresponding to the energy storage device is determined based on the absolute value of the energy storage dispatch power and the absolute value of the maximum charge and discharge power. If the absolute value of the maximum charge and discharge power is less than the absolute value of the energy storage dispatch power, the expected value of the sub-DC side power response should be determined as the maximum charge and discharge power; if the absolute value of the maximum charge and discharge power is greater than the absolute value of the energy storage dispatch power, the expected value of the sub-DC side power response should be determined as the energy storage dispatch power.

[0048] Among them, the maximum charging and discharging power includes: maximum charging power and maximum discharging power, the maximum charging power is negative, and the maximum discharging power is positive.

[0049] The maximum discharge power of the energy storage device represents the maximum discharge power comprehensively obtained based on the current energy storage device within the allowable range of performance parameters and under balanced distribution; the maximum charging power of the energy storage device represents the maximum charging power comprehensively obtained based on the current energy storage device within the allowable range of performance parameters and under balanced distribution.

[0050] After obtaining the expected sub-DC side power response value corresponding to the energy storage device, the expected sub-DC side power response value is summed with the expected sub-DC side power response values ​​corresponding to other target modules to obtain the expected DC side power response value corresponding to the target power conversion device.

[0051] The specific method for determining the expected value of the DC side power response of the DC coupling point of a certain power conversion device is described below.

[0052] 1. If the power conversion equipment is a pure storage equipment: The expected DC side power response value of the DC coupling point is the current ability of the energy storage device to respond to the first AC side scheduling parameter value.

[0053] 1) When the first AC side scheduling parameter value is the discharge direction: When the absolute value of the maximum discharge power of the energy storage device is less than the absolute value of the first AC side scheduling parameter value, the expected value of the DC side power response of the DC coupling point is equal to the maximum discharge power; When the absolute value of the maximum discharge power of the energy storage device is greater than the absolute value of the first AC side scheduling parameter value, the expected value of the DC side power response of the DC coupling point is equal to the first AC side scheduling parameter value; 2) When the first AC side scheduling parameter value is charging direction: When the absolute value of the maximum charging power of the energy storage device is less than the absolute value of the first AC side scheduling parameter value, the expected value of the DC side power response of the DC coupling point is equal to the maximum charging power; When the absolute value of the maximum charging power of the energy storage device is greater than the absolute value of the first AC side scheduling parameter value, the expected value of the DC side power response of the DC coupling point is equal to the first AC side scheduling parameter value.

[0054] 2. If the power conversion equipment is a pure optical device: The expected value of the DC side power response at the DC coupling point is the maximum output power of the power generation equipment in the current state.

[0055] 3. If the power conversion equipment is a photovoltaic storage device: The expected value of the DC side power response at the DC coupling point is the maximum output power of the current power generation equipment.

[0056] The expected value of the power response of the sub-DC side corresponding to the power generation equipment is: maximum power generation; Energy storage dispatch power = first AC side dispatch parameter value - absolute value of maximum power generation; 1) When the energy storage dispatch power is in the discharge direction: a. When the absolute value of the maximum discharge power of the energy storage device is less than the absolute value of the energy storage dispatch power, The expected value of the sub-DC side power response corresponding to the energy storage device = the maximum discharge power; The expected value of the DC side power response = the expected value of the sub-DC side power response corresponding to the power generation equipment + the expected value of the sub-DC side power response corresponding to the energy storage equipment = the absolute value of the maximum power generation + the absolute value of the maximum discharge power of the energy storage equipment; b. When the absolute value of the maximum discharge power of the energy storage device is greater than the absolute value of the energy storage dispatch power, The expected value of the sub-DC side power response corresponding to the energy storage device = the energy storage dispatching power; The expected value of the DC side power response = the expected value of the sub-DC side power response corresponding to the power generation equipment + the expected value of the sub-DC side power response corresponding to the energy storage equipment = the absolute value of the maximum power generation + the first AC side scheduling parameter value - the absolute value of the maximum power generation = the first AC side scheduling parameter value; 2) When the energy storage dispatch power is in the charging direction: a. When the absolute value of the maximum charging power of the energy storage device is less than the absolute value of the energy storage dispatching power, The expected value of the DC side power response corresponding to the energy storage device = the maximum charging power; The expected value of the DC side power response = the expected value of the sub-DC side power response corresponding to the power generation equipment + the expected value of the sub-DC side power response corresponding to the energy storage equipment = the absolute value of the maximum power generation power - the absolute value of the maximum charging power of the energy storage equipment; b. When the absolute value of the maximum charging power of the energy storage device is greater than the absolute value of the energy storage dispatching power, The expected value of the sub-DC side power response corresponding to the energy storage device = the energy storage dispatching power; The expected value of the DC side power response = the expected value of the sub-DC side power response corresponding to the power generation equipment + the expected value of the sub-DC side power response corresponding to the energy storage equipment = the absolute value of the maximum power generation + the first AC side scheduling parameter value - the absolute value of the maximum power generation = the first AC side scheduling parameter value.

[0057] 4. If the power conversion equipment is a pure storage device + power consumption equipment: The expected value of the DC side power response of the DC coupling point is the current ability of the energy storage device to respond to the first AC side scheduling parameter value and the power-consuming device.

[0058] The expected value of the DC side power response corresponding to the power-consuming device is: charging request power; Energy storage dispatch power = first AC side dispatch parameter value + absolute value of charging request power; 1) When the energy storage dispatch power is in the discharge direction: a. When the absolute value of the maximum discharge power of the energy storage device is less than the absolute value of the energy storage dispatch power, The expected value of the sub-DC side power response corresponding to the energy storage device = the maximum discharge power; The expected value of the DC side power response = the expected value of the sub-DC side power response corresponding to the electric device + the expected value of the sub-DC side power response corresponding to the energy storage device = - the absolute value of the charging request power + the absolute value of the maximum discharge power of the energy storage device; b. When the absolute value of the maximum discharge power of the energy storage device is greater than the absolute value of the energy storage dispatch power, The expected value of the sub-DC side power response corresponding to the energy storage device = the energy storage dispatching power; The expected DC side power response value = the expected sub-DC side power response value corresponding to the electric device + the expected sub-DC side power response value corresponding to the energy storage device = - the absolute value of the charging request power + the first AC side scheduling parameter value + the absolute value of the charging request power = the first AC side scheduling parameter value; 2) When the energy storage dispatch power is in the charging direction: a. When the absolute value of the maximum charging power of the energy storage device is less than the absolute value of the energy storage dispatching power, The expected value of the DC side power response corresponding to the energy storage device = the maximum charging power; The expected value of the DC side power response = the expected value of the sub-DC side power response corresponding to the electric device + the expected value of the sub-DC side power response corresponding to the energy storage device = - the absolute value of the charging request power - the absolute value of the maximum charging power of the energy storage device; b. When the absolute value of the maximum charging power of the energy storage device is greater than the absolute value of the energy storage dispatching power, The expected value of the sub-DC side power response corresponding to the energy storage device = the energy storage dispatching power; The expected value of the DC side power response = the expected value of the sub-DC side power response corresponding to the electric device + the expected value of the sub-DC side power response corresponding to the energy storage device = - the absolute value of the charging request power + the first AC side scheduling parameter value + the absolute value of the charging request power = the first AC side scheduling parameter value.

[0059] 5. If the power conversion equipment is a photovoltaic storage device + power consumption equipment: The expected value of the DC side power response of the DC coupling point is: the maximum output power of the power generation equipment in the current state together with the energy storage equipment responds to the first AC side scheduling parameter value and the charging capability of the power consumption equipment.

[0060] The expected value of the power response of the sub-DC side corresponding to the power generation equipment is: maximum power generation; The expected value of the DC side power response corresponding to the power-consuming device is: charging request power; The energy storage dispatching power is: the first AC side dispatching parameter value + the absolute value of the charging request power - the absolute value of the maximum generated power.

[0061] 1) When the energy storage dispatch power is in the discharge direction: a. When the absolute value of the maximum discharge power of the energy storage device is less than the absolute value of the energy storage dispatch power, The expected value of the sub-DC side power response corresponding to the energy storage device = the maximum discharge power; Expected DC side power response value = expected sub-DC side power response value corresponding to power generation equipment + expected sub-DC side power response value corresponding to power consumption equipment + expected sub-DC side power response value corresponding to energy storage equipment = absolute value of maximum power generation power - absolute value of charging request power + absolute value of maximum discharge power of energy storage equipment; b. When the absolute value of the maximum discharge power of the energy storage device is greater than the absolute value of the energy storage dispatch power, The expected value of the sub-DC side power response corresponding to the energy storage device = the energy storage dispatching power; The expected value of the DC side power response = the expected value of the sub-DC side power response corresponding to the power generation equipment + the expected value of the sub-DC side power response corresponding to the power consumption equipment + the expected value of the sub-DC side power response corresponding to the energy storage equipment = the absolute value of the maximum power generation power - the absolute value of the charging request power + the first AC side scheduling parameter value + the absolute value of the charging request power - the absolute value of the maximum power generation power = the first AC side scheduling parameter value; 2) When the energy storage dispatch power is in the charging direction: a. When the maximum charging power of the energy storage device is less than the energy storage dispatching power, The expected value of the DC side power response corresponding to the energy storage device = the maximum charging power; Expected DC side power response value = expected DC side power response value corresponding to power generation equipment + expected DC side power response value corresponding to power consumption equipment + expected DC side power response value corresponding to energy storage equipment = absolute value of maximum power generation power - absolute value of charging request power - absolute value of maximum charging power of energy storage equipment; b. When the maximum charging power of the energy storage device is greater than the energy storage dispatching power, The expected value of the sub-DC side power response corresponding to the energy storage device = the energy storage dispatching power; The expected value of the DC side power response = the expected value of the sub-DC side power response corresponding to the power generation equipment + the expected value of the sub-DC side power response corresponding to the power consumption equipment + the expected value of the sub-DC side power response corresponding to the energy storage equipment = the absolute value of the maximum power generation power - the absolute value of the charging request power + the first AC side scheduling parameter value + the absolute value of the charging request power - the absolute value of the maximum power generation power = the first AC side scheduling parameter value; 6. If the power conversion equipment is power generation equipment + power consumption equipment: The expected value of the DC side power response of the DC coupling point is: the maximum output power response of the power generation equipment in the current state to the first AC side scheduling parameter value and the charging capacity of the power consumption equipment.

[0062] The expected value of the power response of the sub-DC side corresponding to the power generation equipment is: maximum power generation; The expected value of the DC side power response corresponding to the power-consuming device is: charging request power; The expected value of the DC side power response = the expected value of the sub-DC side power response corresponding to the power generating equipment + the expected value of the sub-DC side power response corresponding to the power consuming equipment = the absolute value of the maximum power generation power - the absolute value of the charging request power.

[0063] It can be understood that, for each power conversion device, the expected value of the DC side power response of the corresponding DC coupling point is comprehensively determined based on the expected value of the sub-DC side power response of each DC module and the first AC side scheduling parameter value under the current working state of the power conversion device. In the actual execution process, it can be calculated by the first converter corresponding to the power conversion device.

[0064] Step 120, determining a target AC electric signal corresponding to the target power conversion device according to an expected value of a DC side power response corresponding to the target power conversion device, an actual electric signal at an AC coupling point, and a reference value of a first electric signal at an AC coupling point; In this step, the first electrical signal reference value is used to characterize the rated voltage or a voltage range within a certain range (such as ±10% or ±20%) above and below the rated voltage, and to characterize the voltage range in which external devices (such as loads, etc.) connected to the power system can work normally. The specific value can be based on user customization or corresponding settings according to the connected external devices, and this application does not limit it.

[0065] In some embodiments, the first electrical signal reference value may be determined based on a rated voltage of a power grid in an area where the power system is located, and is used to enable loads connected to the power system to operate normally.

[0066] For example, when the rated voltage of the power grid is 220V, the first electrical signal reference value may be set to 220V or 220V±2V, etc.

[0067] The actual electrical signal may include the amplitude, effective value or frequency of the actual voltage at the AC coupling point.

[0068] In the case where the actual electrical signal is the amplitude or effective value of the voltage, the first electrical signal reference value, the second electrical signal reference value, and the second electrical signal reference value of the AC coupling point can be set to the reference value corresponding to the amplitude or effective value of the voltage. In the case where the actual electrical signal is the frequency of the voltage, the first electrical signal reference value, the second electrical signal reference value, and the second electrical signal reference value of the AC coupling point can be set to the reference value corresponding to the frequency of the voltage.

[0069] The actual electrical signal is the amplitude, effective value or frequency of the voltage, etc., and the corresponding control logic is similar. The following description will be given taking the amplitude of the voltage as an example.

[0070] For the convenience of description, Upcc is used below to represent the actual electrical signal of the AC coupling point, U1_ref represents the first electrical signal reference value of the AC coupling point, Px_dc represents the expected value of the DC side power response of the x-th power conversion device, and Px_ac_1 represents the first AC side scheduling parameter value of the x-th power conversion device.

[0071] In some embodiments, step 120 may include: Determining a first AC side scheduling parameter value according to an actual electrical signal at the AC coupling point and a first electrical signal reference value; A target AC power signal corresponding to the target power conversion device is determined according to the first AC side scheduling parameter value and the expected value of the DC side power response corresponding to the target power conversion device.

[0072] In this embodiment, if Figure 5 As shown, by making a difference between the first electrical signal reference value and the actual electrical signal at the AC coupling point and performing PI control according to the difference, a first AC side scheduling parameter value for making the actual electrical signal at the AC coupling point follow the first electrical signal reference value can be obtained.

[0073] It can be understood that, for a single-machine system, the first AC side scheduling parameter value corresponding to the AC coupling point is the first AC side scheduling parameter value corresponding to the power conversion device; for a multi-machine parallel system, each power conversion device can still be treated as an independent individual, and the first control signal can be determined based on the actual electrical signal of the AC coupling point and the first electrical signal reference value; the first AC side scheduling parameter value corresponding to the target power conversion device is determined based on the first control signal and the first converter parameter corresponding to the target power conversion device.

[0074] Then, the target AC power signal is determined according to the magnitude relationship between the first AC side scheduling parameter value corresponding to the target power conversion device and the DC side power response expected value corresponding to the target power conversion device.

[0075] In some embodiments, determining a target AC power signal corresponding to the target power conversion device according to the first AC side scheduling parameter value and the expected DC side power response value corresponding to the target power conversion device may include: When the absolute value of the difference between the first AC side scheduling parameter value and the expected value of the DC side power response is less than a first threshold, determining the target AC power signal as the first AC side scheduling parameter value; When the absolute value of the difference between the first AC side scheduling parameter value and the DC side power response expected value is not less than the first threshold, the target AC power signal is determined as the DC side power response expected value.

[0076] In this embodiment, the absolute value of the difference between the first AC side scheduling parameter value and the DC side power response expected value can be expressed as the absolute value of the difference or ratio. The first threshold is a smaller value, such as 0 or a positive number close to 0.

[0077] When the absolute value of the difference between the first AC side scheduling parameter value and the expected value of the DC side power response is less than the first threshold, it can be approximately considered that the first AC side scheduling parameter value is equal to the expected value of the DC side power response; when the absolute value of the difference between the first AC side scheduling parameter value and the expected value of the DC side power response is not less than the first threshold, it is considered that the first AC side scheduling parameter value is not equal to the expected value of the DC side power response.

[0078] When the first AC side scheduling parameter value is approximately equal to the expected value of the DC side power response, the target power conversion device can be controlled to continue operating according to the first AC side scheduling parameter value.

[0079] When the first AC side scheduling parameter value is not equal to the DC side power response expected value, the target power conversion device should be controlled to operate according to the DC side power response expected value.

[0080] The specific method for determining the expected value of the DC side power response has been described in the above embodiment and will not be repeated here.

[0081] In the present application, each power conversion device in a single-machine scenario or a parallel scenario can be independently controlled according to the above-mentioned control method; in the parallel scenario, each power conversion device operates according to its own determined target AC power signal, thereby achieving overall balanced control.

[0082] According to the power control method of the power system provided in the embodiment of the present application, the target AC signal for adjusting the first converter of the power conversion device is determined by the expected value of the DC side power response corresponding to the target power conversion device and the value of the first AC side scheduling parameter of the AC coupling point to control the first converter, so as to adjust the power supply relationship between the power conversion devices so that the power conversion devices reach a balanced state.

[0083] Step 130: Based on the target AC power signal, control the working state of the target power conversion device to adjust the power supply relationship between the power conversion devices.

[0084] In this step, the working state includes the charging and discharging state and the charging and discharging power, etc. The charging and discharging state includes the charging state or the discharging state.

[0085] It should be noted that, for each power conversion device, the corresponding target AC power signal can be calculated by using steps 110 to 120, and then the power conversion device can be independently controlled according to the target AC power signal.

[0086] According to the power control method of the power system provided in the embodiment of the present application, the target AC signal for adjusting the first converter of the power conversion device is determined by the expected value of the DC side power response corresponding to the target power conversion device and the first electrical signal reference value of the AC coupling point to control the first converter, so as to adjust the power supply relationship between the power conversion devices so that the power conversion devices reach a balanced state.

[0087] In some embodiments, determining the first AC side scheduling parameter value according to the actual electrical signal at the AC coupling point and the first electrical signal reference value may include: Determining a first control signal according to an actual electrical signal at the AC coupling point and a first electrical signal reference value; According to the first converter parameter corresponding to the target power conversion device, the first control signal is converted into a first AC side scheduling parameter value for adjusting the first converter.

[0088] In this embodiment, the first converter parameters may include: the parallel rated capacity corresponding to the target power conversion device, the local device rated capacity, the local device rated current, the local device maximum current, the local device rated voltage, and the local device maximum voltage.

[0089] The first control signal may be expressed as different parameter categories such as power, voltage, and current. In the actual implementation process, the corresponding conversion formula may be selected for conversion according to different parameter categories of the first control signal to obtain the first AC side scheduling parameter value.

[0090] For example, when the first control signal is power, the conversion can be performed using the following conversion formula: The first AC side dispatch parameter value = the first control signal ÷ the sum of the parallel rated capacities * the rated capacity of the local equipment.

[0091] For another example, when the first control signal is a voltage, the conversion can be performed using the following conversion formula: The first AC side dispatch parameter value = the first control signal / the sum of the parallel rated capacity * the local equipment rated capacity * K1; Here, K1 represents a coefficient for converting voltage into power, including but not limited to the rated current of the local device, the maximum current of the local device, etc.

[0092] For example, when the first control signal is a current, the conversion can be performed using the following conversion formula: The first AC side dispatch parameter value = the first control signal / the sum of the parallel rated capacity * the local equipment rated capacity * K2; Here, K2 represents a coefficient for converting current into power, including but not limited to the rated voltage of the local device, the maximum voltage of the local device, etc.

[0093] In some embodiments, determining the first control signal according to the actual electrical signal at the AC coupling point and the first electrical signal reference value may include: A first control signal is generated according to a first difference between the actual electrical signal and a first electrical signal reference value.

[0094] In this embodiment, the first control signal can be obtained by controlling the difference between the actual electrical signal at the AC coupling point and the first electrical signal reference value using a PI control algorithm, so that the actual electrical signal at the AC coupling point can track the first electrical signal reference value.

[0095] Of course, in other embodiments, other control algorithms may also be used to determine the first control signal according to the actual electrical signal at the AC coupling point and the first electrical signal reference value, which is not limited in the present application.

[0096] In some embodiments, determining a target AC power signal corresponding to the target power conversion device according to the first AC side scheduling parameter value and the expected DC side power response value corresponding to the target power conversion device may include: Determining a target AC power signal based on the first AC side scheduling parameter value and the DC side power response expected value; An upper limit and / or a lower limit threshold is set for the target AC power signal to correct the target AC power signal.

[0097] In this embodiment, the specific method for determining the target AC power signal based on the first AC side scheduling parameter value and the DC side power response expected value has been described in the above embodiment and will not be repeated here.

[0098] In some embodiments, the determined target AC power signal may be threshold-limited according to upper and lower thresholds to further maintain the normal operation of the power system.

[0099] The upper and lower thresholds may be user-defined or adaptively adjusted according to actual application scenarios. In some embodiments, the upper and lower thresholds may include at least one of a second electrical signal reference value and a third electrical signal reference value.

[0100] The second electrical signal reference value is greater than the first electrical signal reference value, and the first electrical signal reference value is greater than the third electrical signal reference value.

[0101] In some embodiments, the second electrical signal reference value may be a maximum power value for the system to work normally; and the third electrical signal reference value may be a minimum power value for the system to work normally.

[0102] In some embodiments, the second electrical signal reference value may be determined based on a sampling error of the first converter and / or a maximum electrical signal of an external device connected to the power system under normal operating conditions.

[0103] In this embodiment, the external device may be an electrical device or a power generation device.

[0104] The second electrical signal reference value may be a maximum electrical signal of an external device connected to the power system under normal operating conditions, or a value close to the maximum electrical signal of an external device connected to the power system under normal operating conditions.

[0105] Alternatively, the second electrical signal reference value may be determined based on a sampling error of the first converter, so that an absolute value of a difference between the second electrical signal reference value and the first electrical signal reference value can at least cover a sampling error of the first converter with respect to the AC voltage.

[0106] It should be noted that no matter how the second electrical signal reference value is determined, it is necessary to ensure that the first electrical signal reference value is smaller than the second electrical signal reference value.

[0107] In some embodiments, the third electrical signal reference value is determined based on a sampling error of the first converter and / or a minimum electrical signal of an external device connected to the power system in a normal operating state.

[0108] In this embodiment, the external device may be an electrical device or a power generation device.

[0109] The third electrical signal reference value may be a minimum electrical signal of an external device connected to the power system in a normal operating state, or a value close to the minimum electrical signal of an external device connected to the power system in a normal operating state.

[0110] Alternatively, the third electrical signal reference value may be determined based on a sampling error of the first converter, so that an absolute value of a difference between the third electrical signal reference value and the first electrical signal reference value can at least cover a sampling error of the first converter with respect to the AC voltage.

[0111] It should be noted that no matter how the third electrical signal reference value is determined, the first electrical signal reference value must be greater than the third electrical signal reference value.

[0112] In some embodiments, the first electrical signal reference value, the second electrical signal reference value, and the third electrical signal reference value may be dynamically changing values.

[0113] In some embodiments, at least one of the first electrical signal reference value, the second electrical signal reference value, and the third electrical signal reference value may be set accordingly according to the operating time period of the power system and / or the type of external equipment connected to the power system.

[0114] In this embodiment, the external device may be an electrical device or a power generation device, such as an electrical load or a third-party inverter.

[0115] In the actual implementation process, different fixed values ​​within the range can be set according to different time periods set by the power system user; or, according to the change of the external device type, a first electrical signal reference value adapted to it, and a second electrical signal reference value and a third electrical signal reference value linked thereto can be set accordingly.

[0116] It should be noted that no matter how the electrical signal reference values ​​are changed, it is necessary to ensure that the second electrical signal reference value is greater than the first electrical signal reference value, and the first electrical signal reference value is greater than the third electrical signal reference value.

[0117] In some embodiments, limiting the upper and / or lower thresholds of the target AC power signal and correcting the target AC power signal may include: When the target AC power signal is greater than the second AC power signal, the target AC power signal is updated to the second AC power signal.

[0118] In this embodiment, the second AC electric signal is determined based on the actual electric signal and a second electric signal reference value of the AC coupling point, and the second electric signal reference value is greater than the first electric signal reference value.

[0119] In some embodiments, the second AC electrical signal is determined based on the actual electrical signal and a second electrical signal reference value at the AC coupling point, and may include: The second alternating current electric signal is determined according to the actual electric signal at the alternating current coupling point and the second electric signal reference value.

[0120] In some embodiments, determining the second AC electrical signal according to the actual electrical signal at the AC coupling point and the second electrical signal reference value may include: Determining a second control signal according to an actual electrical signal at an AC coupling point and a second electrical signal reference value; According to the first converter parameter corresponding to the target power conversion device, the second control signal is converted into a second alternating current signal for regulating the first converter.

[0121] In this embodiment, if Figure 5 As shown, the second control signal can be obtained by PI control according to the difference between the actual electrical signal at the AC coupling point and the second electrical signal reference value U2_REF; then, combined with the first converter parameter corresponding to the target power conversion device, the second control signal is converted into a second AC signal for adjusting the first converter, such as Figure 6As shown, according to the category corresponding to the second control signal, whether it is power, voltage or current, the corresponding conversion method is selected to convert it into a second AC signal. The specific conversion formula is similar to the conversion method of the first control signal, and this application will not elaborate on it here.

[0122] like Figure 7 As shown, when the target AC power signal is greater than the second AC power signal, it is considered that the target AC power signal exceeds the maximum threshold for the normal operation of the system, and the target AC power signal is updated to the second AC power signal, so that the target power conversion device operates according to the second AC power signal, that is, operates at the maximum output capacity maintained under normal working conditions.

[0123] In some embodiments, limiting the upper and / or lower thresholds of the target AC power signal and correcting the target AC power signal may include: When the target AC power signal is smaller than the third AC power signal, the target AC power signal is updated to the third AC power signal.

[0124] In this embodiment, the third AC electric signal is determined based on the actual electric signal and a third electric signal reference value of the AC coupling point, and the third electric signal reference value is smaller than the first electric signal reference value.

[0125] In some embodiments, the third AC electrical signal is determined based on the actual electrical signal and a third electrical signal reference value at the AC coupling point, and may include: A third alternating current electric signal is determined according to the actual electric signal at the alternating current coupling point and the third electric signal reference value.

[0126] In some embodiments, determining the third AC electrical signal according to the actual electrical signal at the AC coupling point and the third electrical signal reference value may include: determining a third control signal according to an actual electrical signal at the AC coupling point and a third electrical signal reference value; According to the first converter parameter corresponding to the target power conversion device, the third control signal is converted into a third alternating current signal for regulating the first converter.

[0127] In this embodiment, if Figure 5 As shown, the third control signal can be obtained by PI control according to the difference between the actual electric signal at the AC coupling point and the reference value of the second electric signal; then, combined with the first converter parameter corresponding to the target power conversion device, the third control signal is converted into a third AC electric signal for adjusting the first converter, such as Figure 6 As shown, according to the category corresponding to the third control signal, whether it is power, voltage or current, the corresponding conversion method is selected to convert it into a third AC signal. The specific conversion formula is similar to the conversion method of the first control signal, and this application will not elaborate on it here.

[0128] like Figure 7 As shown, when the target AC power signal is less than the third AC power signal, it is considered that the target AC power signal is lower than the minimum threshold for the normal operation of the system, and the target AC power signal is updated to the third AC power signal, so that the target power conversion device operates according to the third AC power signal, that is, operates with the minimum output capacity to maintain normal working conditions.

[0129] According to the power control method of the power system provided in the embodiment of the present application, by limiting the upper and / or lower threshold values ​​of the target AC power signal, it is possible to ensure that the operating parameters of each power conversion device are maintained within a normal range while ensuring the balanced operation of each power conversion device, thereby reducing the impact and damage to the equipment and improving the stability of operation.

[0130] In some embodiments, step 130 may include: Based on the target AC electric signal and the actual electric signal of the controlled point corresponding to the AC coupling point, the target power conversion device is closed-loop controlled.

[0131] In this embodiment, PI control may be performed on the target power conversion device according to the difference between the target AC power signal and the actual power signal.

[0132] In some embodiments, the controlled point may be an AC coupling point; or the controlled point may be Figure 8 As shown at the midpoint C, there is a line loss between the AC coupling point and the actual controlled point, wherein the actual electrical signal corresponding to point C can be approximately regarded as the sampling value of the first converter itself.

[0133] It is understandable that the selection of controlled points may result in different ways of acquiring the corresponding actual electrical signals.

[0134] In some embodiments, when the controlled point is an AC coupling point, an actual electrical signal is obtained according to a gateway sampling signal; When the controlled point is a non-AC coupling point, the actual electrical signal is obtained according to the AC side sampling signal of the power conversion device.

[0135] In this embodiment, if the controlled point is an AC coupling point, the gateway device can directly obtain the sampling value at the AC coupling point, and determine the sampled gateway sampling signal as the actual electrical signal.

[0136] If the controlled point is Figure 8 The point shown by the midpoint C can use the AC side sampling signal of each power conversion device (such as the sampling value of the first converter itself) as the actual electrical signal corresponding to the controlled point.

[0137] As the number of parallel machines increases, the distance between the AC coupling point and the physical position of each first converter will increase, which will lead to an increase in the line loss between the AC coupling point and the actual controlled point C. Through the above sampling method, a more accurate actual electrical signal can be obtained.

[0138] According to the power control method of the electric power system provided in the embodiment of the present application, the corresponding actual electrical signal collection method is selected according to the actual position of the controlled point, which can reduce the influence of the cable line loss between the AC coupling point and the actual controlled point when they are not the same point on the control result, improve the control precision and accuracy, thereby better maintaining the balanced and stable operation of the system, and has high control flexibility and adaptability.

[0139] In some embodiments, In the case where the power system includes a power conversion device, the actual electrical signal is obtained according to the AC side sampling signal of the power conversion device and / or the gateway sampling signal; In the case where the power system includes multiple power conversion devices, the actual electric signal is obtained according to the AC side sampling signal of at least one power conversion device, the average value of the AC side sampling signals of each power conversion device and the gateway sampling signal.

[0140] In this embodiment, for a single machine scenario, the AC side sampling signal of the power conversion device can be directly used as the actual electrical signal corresponding to the controlled point, or the gateway sampling signal collected by the gateway device can be determined as the actual electrical signal.

[0141] For multi-machine scenarios, the gateway sampling signal collected by the gateway device can be determined as the actual electrical signal; or the AC side sampling signal of a certain power conversion device itself can be used as the actual electrical signal of the controlled point.

[0142] In some embodiments, for multi-machine scenarios, the AC side sampling signals of some or all of the power conversion devices included in the power system can be averaged, and the obtained average value can be determined as the actual electrical signal to further improve the authenticity of the actual electrical signal, thereby improving control accuracy.

[0143] The following description will be made by taking the power system as a single-machine system as an example.

[0144] In a single-machine scenario, the power system includes a power conversion device, which is connected to an external device, which can be a load or a third-party power generation device.

[0145] In a single-machine scenario, the power of the third-party power generation equipment and / or load is Pload, the first AC side scheduling parameter value corresponding to the power conversion equipment is = Pac_1, Pac_1 = Pload, and the relationship between the first AC side scheduling parameter value P ac_1 and the DC side power response expected value Pdc includes the following situations: Single machine scenario 1, Pac_1=Pdc When the external device is an electric device, such as a load, it means that the DC side power output capacity of the power conversion device is just enough to supply power to the load. At this time, the target AC power signal is determined as the first AC side scheduling parameter value, so that the power conversion device adjusts the output of the first converter according to the first AC side scheduling parameter value, so that the voltage reference Uref_device at the AC coupling point mapped to the target power conversion device is equal to the first electrical signal reference value Uref_1.

[0146] At the AC coupling point, the actual electric signal Upcc is closed-loop controlled with the first electric signal reference value Uref_1 as a voltage reference, and Upcc is controlled to be Uref_1, so that the power output of the first converter is balanced with the power of the electric device.

[0147] When the external device is a power generation device, such as a third-party inverter, it means that the DC side power absorption capacity of the power conversion device is just enough to absorb the power of the third-party inverter. At this time, the target AC signal is determined as the first AC side scheduling parameter value, so that the power conversion device adjusts the output of the first converter according to the first AC side scheduling parameter value, so that the voltage reference Uref_device at the AC coupling point mapped to the target power conversion device = the first electrical signal reference value Uref_1: At the AC coupling point, the actual electric signal Upcc is closed-loop controlled with the first electric signal reference value Uref_1 as a voltage reference, and Upcc is controlled to be Uref_1, so that the power input of the first converter and the power of the electric device are balanced.

[0148] Single machine scenario 2, Pac_1 <Pdc When the external device is an electric device, such as a load, it means that the expected output power of the DC side of the power conversion device is greater than the power of the load. Possible reasons include but are not limited to: The power conversion equipment includes photovoltaic equipment, and the maximum PV power is greater than Pac_1 and the sum of all rechargeable powers on the DC side; specifically, it may include: (a) For pure light equipment: the expected value of the power response on the DC side = the maximum power generation power > Pac_1; (b) For the photovoltaic storage equipment, the expected value of the power response on the DC side = the maximum power generation power - the maximum charging power of the energy storage device > Pac_1, indicating that the PV power can charge the energy storage device at full power while meeting Pac_1, and there is still surplus photovoltaic power; (c) For the photovoltaic storage charging equipment, the expected value of the power response on the DC side = the maximum power generation power - the charging request power - the maximum charging power of the energy storage device > Pac_1, indicating that the PV power can charge the charging device and the energy storage device at full power while meeting Pac_1, and there is still surplus photovoltaic power. (d) For the photovoltaic charging equipment, the expected value of the power response on the DC side = the maximum power generation power - the charging request power > Pac_1, indicating that the PV power can charge the charging device at full power while meeting Pac_1, and there is still surplus photovoltaic power.

[0149] For the above situation, the target AC power signal may be determined as the expected value of the DC side power response to increase the power of the load, so that the power of the first converter and the power of the external device are balanced as much as possible.

[0150] In some embodiments, the upper limit of the target AC signal can also be set to maximize the control power of the first converter on the basis that the external device can operate normally, so that more output is made for high DC expected power and less output is made for low DC expected power, so as to achieve energy distribution between devices. At the AC coupling point, it is reflected in the closed-loop control of Upcc with the second electrical signal reference value Uref_2 as the voltage reference, while limiting the inverter output, raising Upcc to Uref_2, increasing the load power, and the first converter responding to the second AC signal Pac_2 to achieve balance with the load power. The inverter output is adjusted according to the second control reference to adjust the voltage expected reference value, that is, Uref_device=Uref_2.

[0151] In the case where the external device is a power generation device, it means that the sum of the maximum charging powers of the DC-side rechargeable devices is less than the total PV power, that is, the power input capacity of the power conversion device is insufficient to absorb the power of the power generation device. Possible reasons include but are not limited to: Specifically, it may include: (a) For pure light equipment: DC-side power response expected value = maximum power generation > Pac_1; (b) For photovoltaic storage devices, DC-side power response expected value = maximum power generation - maximum charging power of energy storage device > Pac_1, indicating that the energy storage device is charged at full power, and there is still photovoltaic power remaining including external devices; (c) For photovoltaic storage charging devices, DC-side power response expected value = maximum power generation - charging request power - maximum charging power of energy storage device > Pac_1, indicating that the charging device and the energy storage device are charged at full power at the same time, and there is still photovoltaic power remaining including external devices. (d) For photovoltaic charging devices, DC-side power response expected value = maximum power generation - charging request power > Pac_1, indicating that the charging device is charged at full power, and there is still photovoltaic power remaining including external devices. (e) For the charging and storage device, the expected value of the DC side power response = charging request power - maximum charging power of the energy storage device > Pac_1, which means that the charging device and the energy storage device are charged at full power at the same time, and there is still surplus photovoltaic power of the external device.

[0152] For the above situation, the target AC power signal may be determined as the expected value of the DC side power response to reduce the power of the external power generation device so that the power of the first converter and the power of the external device are balanced as much as possible.

[0153] In some embodiments, the target AC power signal can also be capped to maximize the control power of the first converter while ensuring that the external device can operate normally. This is reflected at the AC coupling point as a closed-loop control of Upcc using Uref_2 as a voltage reference, raising Upcc to Uref_2, and reducing the power of the power generation equipment. The first converter responds to the second AC power signal Pac_2 and reaches a balance with the load power; that is, Uref_device=Uref_2.

[0154] Single machine scenario 3, Pac_1>Pdc When the external device is an electric device, such as a load, it means that the expected output power of the DC side of the power conversion device is less than the power of the load. Possible reasons include but are not limited to: The sum of the maximum power generation and all the dischargeable powers on the DC side is greater than the sum of the loads on the DC side and the AC side; specifically, it may include: (a) For a pure photovoltaic device: the expected value of the DC side power response = the maximum power generation < Pac_1; (b) For a photovoltaic and energy storage device, the expected value of the DC side power response = the maximum power generation + the maximum discharge power of the energy storage device < Pac_1, indicating that the sum of the PV power and the maximum discharge power of the energy storage is less than Pac_1; (c) For a photovoltaic, energy storage and charging device, the expected value of the DC side power response = the maximum power generation - the charging request power + the maximum discharge power of the energy storage device < Pac_1, indicating that the sum of the PV power and the maximum discharge power of the energy storage is less than the sum of the charging power of the charging pile and Pac_1; (d) For a pure energy storage device, the expected value of the DC side power response = the maximum discharge power of the energy storage device < Pac_1, indicating that the maximum discharge power of the energy storage is less than Pac_1; (e) For a photovoltaic and charging device, the expected value of the DC side power response = the maximum power generation - the charging request power < Pac_1, indicating that the PV power is less than the sum of the charging power of the charging pile and Pac_1; (f) For an energy storage and charging device, the expected value of the DC side power response = the maximum discharge power of the energy storage device - the charging request power < Pac_1, indicating that the maximum discharge power of the energy storage is less than the sum of the charging power of the charging pile and Pac_1.

[0155] For the above cases, the target AC signal can be determined as the expected value of the DC side power response to reduce the load power and make the power of the first converter and the power of the external device as balanced as possible.

[0156] In some embodiments, a lower limit can be set for the target AC signal to minimize the control power of the first converter as much as possible on the basis that the external device can operate normally. At the AC coupling point, it is embodied as a closed-loop control of Upcc with the third AC signal Uref_3 as the voltage reference. While reducing Upcc to Uref_3, the load power is reduced, and the inverter responds to the third AC signal Pac_3 to balance with the load power; that is: Uref_device = Uref_3.

[0157] In the case where the external device is a power generation device, it means that the expected input power of the power conversion device is greater than the power of the power generation device. The possible reasons include, but are not limited to: The total PV power is less than the sum of all dischargeable powers on the DC side and the sum of the DC side load powers; specifically, it may include: (a) For a photovoltaic energy storage charging device, the expected value of the DC side power response = the maximum power generation - the charging request power + the maximum discharge power of the energy storage device < Pac_1, indicating that the sum of the total PV power including the power generation device and the maximum discharge power of the energy storage is less than the charging power of the charging pile; (b) For a photovoltaic charging device, the expected value of the DC side power response = the maximum power generation - the charging request power < Pac_1, and the total PV power including the power generation device is less than the charging power of the charging pile; (c) For an energy storage charging device, the expected value of the DC side power response = the maximum discharge power of the energy storage device - the charging request power < Pac_1, indicating that the sum of the total PV power including the power generation device and the maximum discharge power of the energy storage is less than the charging power of the charging pile.

[0158] For the above situations, the target AC signal is determined as the expected value of the DC side power response to increase the power generation of the external device and make the power of the first converter as balanced as possible with the power of the external device.

[0159] In some embodiments, the lower limit of the target AC signal can be limited to increase the control power of the first converter as much as possible on the basis that the external device can operate normally. At the AC coupling point, it is manifested as a closed-loop control of Upcc with the third AC signal Uref_3 as the voltage reference. While reducing Upcc to Uref_3, the output of the power generation device is increased, and its own power input is reduced. The first converter responds to the third AC signal Pac_3 and reaches balance with the power of the power generation load; at this time: Uref_device = Uref_3.

[0160] In some embodiments, in the case where there are multiple power conversion devices in the power system, the multiple power conversion devices can be regarded as a whole and equivalent to a power conversion device. The magnitude of its power and the power of the external device determine the grid connection point voltage (controlled to one of Uref_1, Uref_2, Uref_3), and also determine the total power output of the inverter (one of Pac_1, Pac_2, Pac_3). On this basis, since the devices in different operating states are equivalent to a closed-loop control of Upcc with different voltage references at the AC coupling point, the power distribution between devices is realized, and the balanced control in the multi-machine scenario is achieved.

[0161] Next, taking the multi-machine scenario as an example, the implementation effect of the method of the present application will be described.

[0162] Take two parallel machines as an example, that is, two power conversion devices are respectively connected to the AC coupling point and connected to the external device through the AC coupling point. The two power conversion devices are represented by device 1 and device 2 below, wherein the first AC side scheduling parameter value corresponding to device 1 is P1_ac, the first AC side scheduling parameter value corresponding to device 2 is P2_dc, and the second AC side scheduling parameter value corresponding to device 1 and device 2 as a whole is P1_ac+P2_ac; the DC side power response expected value corresponding to device 1 is P1_dc, the DC side power response expected value corresponding to device 2 is P2_dc, the AC power corresponding to the external device is Pload, and P1_ac+P2_ac=Pload.

[0163] By determining the relationship between the first AC side scheduling parameter value corresponding to each power conversion device and the expected value of the DC side power response corresponding to the power conversion device, the target AC power signal corresponding to each power conversion device can be obtained respectively through the above steps 110 to 130. When the power conversion devices are operating according to the corresponding target AC power signals, the voltage references mapped to the AC coupling points of devices 1 and 2 are represented as Uref_device_1 and Uref_device_2 respectively.

[0164] Fig. 9 A variety of situations are exemplified, and each situation is described in detail below.

[0165] 1. The power conversion equipment operates according to its corresponding target AC power signal, and the voltage reference mapped to the AC coupling point is as follows: the voltage reference corresponding to one of the devices is the first electrical signal reference value Uref_1, and the voltage reference corresponding to the other device is the second electrical signal reference value Uref_2, such as parallel situation 4 and parallel situation 5.

[0166] The following is explained using the example of Uref_device_1=Uref_1; Uref_device_2=Uref_2.

[0167] 1) When the external device is an electric device, at the AC coupling point, device 1 uses Uref_1 as a voltage reference to perform closed-loop control on Upcc, and device 2 uses Uref_2 as a voltage reference to perform closed-loop control on Upcc. Since Uref_2>Uref_1, device 2 can output power first.

[0168] When the actual electrical signal Upcc of the controlled point is controlled to Uref_2, it means that Pac_1 + Pac_2 < Pdc, where Pdc = P1_dc + P2_dc; the two parallel machines are equivalent to the single-machine case 2; at this time, device 1 has absorbed power to its maximum capacity, and device 2 is scheduled by the second control signal of the total dispatching unit, indicating that on the basis of meeting the sum of the load and the maximum absorbed power of device 1, device 2 still has a certain expected output power, that is, P2_out ≤ P2_dc; the power flow is as Fig.10 shown in Figure ① in the middle

[0169] When the actual electrical signal Upcc of the controlled point is controlled to Uref_1, it means that Pac_1 + Pac_2 = Pdc, and the two parallel machines are equivalent to the single-machine case 1; at this time, device 2 has output all the expected output power on the DC side, and device 1 is scheduled by the first control signal of the total dispatching unit. Specifically, when the output power of device 2 is greater than the load power, device 1 and the load power jointly absorb the output power of device 2. At this time, the power flow is as Fig.10 shown in Figure ② in the middle; when the output power of device 2 is less than the load power, the remaining load power to be provided is provided by device 1. At this time, the power flow is as Fig.10 shown in Figure ③ in the middle

[0170] 2) When the external device is a power generation device, at the AC coupling point, it is reflected that device 1 performs closed-loop control on Upcc with Uref_1 as the voltage reference, and device 2 performs closed-loop control on Upcc with Uref_2 as the voltage reference. Since Uref_2 > Uref_1, device 1 preferentially absorbs the power of the power generation device.

[0171] When the actual electrical signal Upcc of the controlled point is controlled to Uref_2, the two parallel machines are equivalent to the single-machine case 2. At this time, device 1 has absorbed power to its maximum capacity, and device 2 is scheduled by the second control signal of the total dispatching unit, indicating that together with the power generation device, it still has a certain expected output power; specifically, when the power generation load power is greater than the maximum power absorption capacity of device 1, device 2 assists in absorbing power. At this time, the power flow is as Fig.11 shown in Figure ① in the middle; when the power generation device power is less than the maximum power absorption capacity of device 1, device 2 outputs power as much as possible. At this time, the power flow is as Fig.11 shown in Figure ② in the middle When the actual electrical signal Upcc of the controlled point is controlled to Uref_1, the two parallel machines are equivalent to the single-machine case 1, and the two parallel machines are equivalent to the single-machine case 1; at this time, device 2 has output all the expected output power on the DC side, and device 1 is scheduled by the first control signal of the total dispatching unit. Device 1 absorbs the power generation load power and the expected output power of device 2. At this time, the power flow is as Fig.11 shown in Figure ③ in the middle

[0172] 2. The power conversion equipment operates according to its corresponding target AC power signal, and the voltage reference mapped to the AC coupling point is expressed as follows: the voltage reference corresponding to one of the devices is the first electrical signal reference value Uref_1, and the voltage reference corresponding to the other device is the third electrical signal reference value Uref_3, such as parallel scenario 6 and parallel scenario 7.

[0173] The following is explained using the example of Uref_device_1=Uref_1; Uref_device_2=Uref_3.

[0174] 1) When the external device is an electric device, at the AC coupling point, device 1 uses Uref_1 as a voltage reference to perform closed-loop control on Upcc, and device 2 uses Uref_3 as a voltage reference to perform closed-loop control on Upcc. Device 1 outputs power first.

[0175] When the actual electrical signal Upcc of the controlled point is controlled to Uref_3, the two parallel machines are equivalent to the single machine situation 3; at this time, device 1 has output power to the maximum extent possible, and device 2 accepts the scheduling of the third control signal of the general scheduling unit, which means that the output power of device 1 still does not meet the expected absorption power and load power of device 2; specifically, when the load power is greater than the maximum output power of device 1, the power flow is as follows Fig.12 As shown in Figure ①; when the load power is less than the maximum output power of device 1, by reducing Upcc to Uref_3, the load power is reduced, and the expected absorption power of device 2 is reduced, so that device 1 can do its best to meet the power of device 2 and the load, and achieve a balance. At this time, the power flow is as follows Fig.12 As shown in Figure ②; When the actual electrical signal Upcc of the controlled point is controlled to Uref_1, the two parallel machines are equivalent to the single machine situation 1; at this time, device 2 has absorbed all the expected absorption power on the DC side, and device 1 accepts the dispatch of the first control signal of the general dispatch unit, which means that device 1 can output the expected input power on the DC side of device 2 while meeting the load power, that is, device 1 supplies power to device 2 and the load to achieve balance. At this time, the power flow is as follows: Fig.12 As shown in Figure ③; 2) When the external device is a power generation device, at the AC coupling point, device 1 uses Uref_1 as a voltage reference to perform closed-loop control on Upcc, and device 2 uses Uref_3 as a voltage reference to perform closed-loop control on Upcc. Device 2 preferentially absorbs the power of the power generation device.

[0176] When the actual electrical signal Upcc of the controlled point is controlled to Uref_3, the two parallel machines are equivalent to the single machine situation 3. At this time, device 1 has output power to the maximum extent possible, and device 2 accepts the dispatch of the third control signal of the general dispatch unit, which means that device 1 and the power generation load have output power to the maximum extent possible, and still cannot meet the expected absorption power of the DC side of device 2. At this time, device 2 reduces Upcc to Uref_2, reduces the expected absorption power, and increases the power of device 1 and the power generation load, so that the power output of device 1 and the power generation load to the maximum extent possible can be balanced with the expected absorption power of device 2, as shown in the figure. Fig.13 As shown in Figure ①; When the actual electrical signal Upcc of the controlled point is controlled to Uref_1, the two parallel machines are equivalent to the single machine situation 1; at this time, device 2 has absorbed all the expected absorbed power on the DC side, and device 1 accepts the dispatch of the first control signal of the general dispatch unit. Specifically, when the power of the power generation equipment is less than the expected absorbed power of device 2, device 1 assists in providing the power required by device 2, such as Fig.13 As shown in Figure ②, when the power of the power generating equipment is greater than the power expected to be absorbed by equipment 2, equipment 1 absorbs the remaining power, such as Fig.13 As shown in Figure ③, balance is achieved.

[0177] 3. The power conversion equipment operates according to its corresponding target AC power signal, and the voltage reference mapped to the AC coupling point is expressed as follows: the voltage reference corresponding to one of the devices is the second electrical signal reference value Uref_2, and the voltage reference corresponding to the other device is the third electrical signal reference value Uref_3, such as parallel situation 8 and parallel situation 9.

[0178] The following is an example of Uref_device_1 = Uref_2; Uref_device_2 = Uref_3.

[0179] 1) When the external device is an electric device, at the AC coupling point, device 1 uses Uref_2 as the voltage reference to perform closed-loop control on Upcc, and device 2 uses Uref_3 as the voltage reference to perform closed-loop control on Upcc. Device 1 outputs power first.

[0180] When the actual electrical signal Upcc of the controlled point is controlled to Uref_1, the two parallel machines are equivalent to the single machine situation 1; at this time, both device 1 and device 2 reach their expected input or output power, and at the same time, they can also meet the load power and achieve balance; when the expected power flow direction of device 1 and device 2 is the same, the power distribution is as follows Fig.14 As shown in Figure ①; when the power flow direction of device 1 and device 2 is opposite, the power distribution is as follows Fig.14 As shown in Figure ②; When the actual electrical signal Upcc of the controlled point is controlled to Uref_2, the two parallel machines are equivalent to the single machine situation 2. At this time, device 2 has absorbed power to the maximum extent possible, and device 1 accepts the dispatch of the second control signal of the general dispatch unit. On the basis of satisfying the sum of the load and the maximum absorbed power of device 2, device 1 still has a certain expected output power. The power flow is as follows: Fig.14 As shown in Figure ③; When the actual electrical signal Upcc of the controlled point is controlled to Uref_3, the two parallel machines are equivalent to the single machine situation 3. At this time, device 1 has output power to the maximum extent possible, and device 2 accepts the dispatch of the third control signal of the general dispatch unit, indicating that the maximum output power of device 1 still does not meet the expected absorption power and load power of device 2; specifically, when the load power is greater than the maximum output power of device 1, the power flow is as follows: Fig.14 As shown in Figure ④; when the load power is less than the maximum output power of device 1, by reducing Upcc to Uref_3, the load power is reduced, and the expected absorption power of device 2 is reduced, so that device 1 can do its best to meet the power of device 2 and the load, and achieve a balance. At this time, the power flow is as follows Fig.14 As shown in Figure ⑤.

[0181] 2) When the external device is a power generation device, at the AC coupling point, device 1 uses Uref_2 as a voltage reference to perform closed-loop control on Upcc, and device 2 uses Uref_3 as a voltage reference to perform closed-loop control on Upcc. Device 2 preferentially absorbs the power of the power generation device.

[0182] When the actual electrical signal Upcc of the controlled point is controlled to Uref_1, the two parallel machines are equivalent to the single machine situation 1; at this time, both device 1 and device 2 reach their expected input or output power, and at the same time, they can also meet the load power and achieve balance; when the expected power flow direction of device 1 and device 2 is the same, the power distribution is as follows Fig.15 As shown in Figure ①; when the power flow direction of device 1 and device 2 is opposite, the power distribution is as follows Fig.15 As shown in Figure ②; When the actual electrical signal Upcc of the controlled point is controlled to Uref_2, the two parallel machines are equivalent to the single machine situation 2. At this time, device 2 has absorbed power to the maximum extent possible, and device 1 accepts the dispatch of the second control signal of the general dispatch unit, indicating that it still has a certain expected output power together with the power generation equipment; specifically, when the power generation load power is greater than the maximum power absorption capacity of device 2, device 1 assists in absorbing power. At this time, the power flow is as follows: Fig.15 As shown in Figure ③; when the power of the power generation equipment is less than the maximum power absorption capacity of equipment 1, equipment 2 outputs power as much as possible. At this time, the power flow is as follows Fig.15 As shown in Figure ④; When the actual electrical signal Upcc of the controlled point is controlled to Uref_3, the two parallel machines are equivalent to the single machine situation 3. At this time, device 1 has output power to the maximum extent possible, and device 2 accepts the dispatch of the third control signal of the general dispatch unit, which means that device 1 and the power generation equipment have output power to the maximum extent possible, and still cannot meet the expected absorption power of the DC side of device 2. At this time, device 2 reduces Upcc to Uref_2, reduces the expected absorption power, and increases the power of device 1 and the power generation equipment, so that the power output of device 1 and the power generation equipment to the maximum extent possible can be balanced with the expected absorption power of device 2, as shown in the figure. Fig.15 As shown in Figure ⑤.

[0183] 4. The power conversion device operates according to its corresponding target AC power signal, and the voltage reference mapped to the AC coupling point is the first electrical signal reference value Uref_1, that is, parallel situation 1: Uref_device_1=Uref_device_2=Uref_1.

[0184] 1) When the external device is an electrical device, the two parallel machines are equivalent to the single machine case 1, which means that the sum of the power output capabilities of device 1 and device 2 is sufficient to supply power to the load. At this time, both device 1 and device 2 accept the dispatch of the first control signal of the general dispatch unit. At the AC coupling point, it is reflected in the closed-loop control of Upcc with Uref_1 as the voltage reference. While controlling Upcc to Uref_1, the inverter power output and the load power are balanced; at this time, the power flow is as follows Fig.16 shown.

[0185] 2) When the external device is a power generation device, the two parallel machines are equivalent to the single machine case 1, which means that the sum of the power input capacity of device 1 and device 2 is sufficient to absorb the power of the power generation device. At this time, both device 1 and device 2 accept the dispatch of the first control signal of the general dispatch unit. At the AC coupling point, it is reflected in the closed-loop control of Upcc with Uref_1 as the voltage reference. While controlling Upcc to Uref_1, the inverter power input and the power of the power generation load are balanced; at this time, the power flow is as follows Fig.17 shown.

[0186] 5. The power conversion device operates according to its corresponding target AC power signal, and the voltage reference mapped to the AC coupling point is the second electrical signal reference value Uref_2, that is, parallel situation 2: Uref_device_1=Uref_device_2=Uref_2.

[0187] 1) When the external device is an electrical device, the two parallel machines are equivalent to the single machine case 2, which means that the sum of the expected output power of device 1 and device 2 is greater than the load power. At this time, both device 1 and device 2 accept the dispatch of the second control signal of the general dispatch unit. At the AC coupling point, it is reflected in the closed-loop control of Upcc with Uref_2 as the voltage reference, limiting the output of device 1 and device 2 while raising Upcc to Uref_2, increasing the load power, so that the inverter power output and the load power are balanced; at this time, the power flow is as follows Fig.18 As shown; 2) When the external device is a power generation device, the two parallel machines are equivalent to the single machine situation 2, which means that the power input capacity of device 1 and device 2 is insufficient to absorb the power of the power generation device. At this time, both device 1 and device 2 accept the dispatch of the third control signal of the general dispatch unit. At the AC coupling point, it is reflected in the closed-loop control of Upcc with Uref_2 as the voltage reference, raising Upcc to Uref_2, reducing the power of the power generation device, so that the inverter power output and the power of the power generation device are balanced; at this time, the power flow is as follows Fig.19 shown.

[0188] 6. The power conversion device operates according to its corresponding target AC power signal, and the voltage reference mapped to the AC coupling point is the third power signal reference value Uref_3, that is, parallel situation 3: Uref_device_1=Uref_device_2=Uref_3.

[0189] 1) When the external device is an electrical device, the two parallel machines are equivalent to the single machine case 3, which means that the sum of the output capacity of device 1 and device 2 is less than the load power. At this time, both device 1 and device 2 accept the dispatch of the third control signal of the general dispatch unit. At the AC coupling point, it is reflected in the closed-loop control of Upcc with Uref_3 as the voltage reference. While reducing Upcc to Uref_3, the load power is reduced, so that the power output of device 1 and device 2 at their maximum capacity is balanced with the load power; at this time, the power flow is as follows Fig. 20 As shown; 2) When the external device is a power generation device, the two parallel machines are equivalent to the single machine situation 3, which means that the expected input power of device 1 and device 2 is greater than the power of the power generation device. At this time, both device 1 and device 2 accept the dispatch of the third control signal of the general dispatch unit. At the AC coupling point, it is reflected in the closed-loop control of Upcc with Uref_3 as the voltage reference. While reducing Upcc to Uref_3, the output of the power generation device is increased and the power input of the power generation device is reduced, so that the inverter power input and the power of the power generation device are balanced; at this time, the power flow is as follows Fig.21 As shown; After many experiments and verifications by the inventor, by adopting the method provided by the present application, the larger the voltage control reference value equivalent to the AC coupling point, the priority is given to outputting power; conversely, the lower the voltage control reference value, the priority is given to absorbing power; thereby achieving energy distribution and energy transfer between devices, giving priority to outputting the desired output power, and giving priority to providing energy to devices that expect input power, thereby achieving balanced control.

[0190] The power control method of the power system provided in the embodiment of the present application can be executed by a power control device of the power system. In the embodiment of the present application, the power control device of the power system provided in the embodiment of the present application is described by taking the power control method of the power system executed by the power control device of the power system as an example.

[0191] An embodiment of the present application also provides a power control device for an electric power system.

[0192] like Fig. 22 As shown, the power system includes at least one power conversion device and a control module electrically connected to the power conversion device, and each power conversion device is respectively connected to an AC coupling point; each power conversion device includes a first converter and at least one DC module, and the power conversion device is used to connect to an external device via an AC coupling point; each DC module in the same power conversion device is respectively connected to the first converter via a DC coupling point; the power control device of the power system includes: a first processing module 2210, a second processing module 2220 and a third processing module 2230.

[0193] The first processing module 2210 is used to obtain an expected value of a DC side power response corresponding to a target power conversion device in at least one power conversion device; The second processing module 2220 is used to determine the target AC electric signal corresponding to the target power conversion device according to the expected value of the DC side power response corresponding to the target power conversion device, the actual electric signal at the AC coupling point and the reference value of the first electric signal at the AC coupling point; The third processing module 2230 is used to control the working state of the target power conversion device based on the target AC power signal to adjust the power supply relationship between the power conversion devices.

[0194] According to the power control device of the power system provided in the embodiment of the present application, the target AC signal for adjusting the first converter of the power conversion device is determined by the expected value of the DC side power response corresponding to the target power conversion device and the first electrical signal reference value of the AC coupling point to control the first converter, so as to adjust the power supply relationship between the power conversion devices so that the power conversion devices reach a balanced state.

[0195] In some embodiments, the second processing module 2220 may also be used to: Determining a first AC side scheduling parameter value according to an actual electrical signal at the AC coupling point and a first electrical signal reference value; A target AC power signal corresponding to the target power conversion device is determined according to the first AC side scheduling parameter value and the expected value of the DC side power response corresponding to the target power conversion device.

[0196] In some embodiments, the second processing module 2220 may also be used to: When the absolute value of the difference between the first AC side scheduling parameter value and the expected value of the DC side power response is less than a first threshold, determining the target AC power signal as the first AC side scheduling parameter value; When the absolute value of the difference between the first AC side scheduling parameter value and the DC side power response expected value is not less than the first threshold, the target AC power signal is determined as the DC side power response expected value.

[0197] In some embodiments, the second processing module 2220 may also be used to: Determine a target AC power signal based on the AC side scheduling parameter value and the DC side power response expected value; An upper limit and / or a lower limit threshold is set for the target AC power signal to correct the target AC power signal.

[0198] In some embodiments, the second processing module 2220 may also be used to: When the target AC signal is greater than the second AC signal, the target AC signal is updated to the second AC signal, the second AC signal is determined based on the actual electrical signal and a second electrical signal reference value of the AC coupling point, and the second electrical signal reference value is greater than the first electrical signal reference value.

[0199] In some embodiments, the second processing module 2220 may also be used to: When the target AC signal is smaller than the third AC signal, the target AC signal is updated to the third AC signal, the third AC signal is determined based on the actual electrical signal and a third electrical signal reference value of the AC coupling point, and the third electrical signal reference value is smaller than the first electrical signal reference value.

[0200] In some embodiments, the second processing module 2220 may also be used to: Determining a first control signal according to an actual electrical signal at the AC coupling point and a first electrical signal reference value; According to the first converter parameter corresponding to the target power conversion device, the first control signal is converted into a first AC side scheduling parameter value for adjusting the first converter.

[0201] In some embodiments, the second processing module 2220 may also be used to: A first control signal is generated according to a first difference between the actual electrical signal and a first electrical signal reference value.

[0202] In some embodiments, the third processing module 2230 may also be used to perform closed-loop control on the target power conversion device based on the target AC power signal and the actual electrical signal of the controlled point corresponding to the AC coupling point.

[0203] In some embodiments, the third processing module 2230 may also be used to: In the case where the power system includes a power conversion device, the actual electrical signal is obtained according to the AC side sampling signal of the power conversion device and / or the gateway sampling signal; In the case where the power system includes multiple power conversion devices, the actual electric signal is obtained according to the AC side sampling signal of at least one power conversion device, the average value of the AC side sampling signals of each power conversion device and the gateway sampling signal.

[0204] In some embodiments, the first processing module 2210 may also be used to: Determine the expected value of the sub-DC side power response corresponding to each DC module according to the type of each DC module included in the target power conversion device; Based on the sum of the expected values ​​of the sub-DC side power responses corresponding to each DC module, the expected value of the DC side power response corresponding to the target power conversion device is determined.

[0205] In some embodiments, the first processing module 2210 may also be used to: In the case where the DC module is a power generation device, the maximum power generation corresponding to the power generation device is determined as the expected value of the sub-DC side power response corresponding to the power generation device; In the case where the DC module is an electric device, the charging request power corresponding to the electric device is determined as the sub-DC side power response expected value corresponding to the electric device; In the case where the DC module is an energy storage device, the expected value of the sub-DC side power response corresponding to the energy storage device is determined according to the types of other DC modules connected to the energy storage device and the first AC side scheduling parameter value, wherein the first AC side scheduling parameter value is determined according to the actual electrical signal of the AC coupling point and the first electrical signal reference value.

[0206] In some embodiments, the first processing module 2210 may also be used to: When all other DC modules connected to the energy storage device are energy storage devices, or there are no other devices connected to the energy storage device, determine the expected value of the sub-DC side power response corresponding to the energy storage device according to the absolute value of the maximum charge and discharge power corresponding to the energy storage device, the absolute value of the first AC side scheduling parameter value, and the charge and discharge state corresponding to the maximum charge and discharge power; In the case where the other DC modules connected to the energy storage device include at least one of a power generation device and a power consumption device, the energy storage scheduling power corresponding to the energy storage device is determined according to the first AC side scheduling parameter value and the expected value of the sub-DC side power response corresponding to each target module; the target module is the power generation device and / or the power consumption device connected to the energy storage device; Based on the energy storage dispatching power corresponding to the energy storage device, the charging and discharging state corresponding to the energy storage dispatching power, and the maximum charging and discharging power corresponding to the energy storage device, the expected value of the sub-DC side power response corresponding to the energy storage device is determined.

[0207] In some embodiments, the first processing module 2210 may also be used to: The expected value of the sub-DC side power response corresponding to the DC module is determined according to at least one of the type of the DC module, the performance parameters of the DC module, the power scheduling of the DC module, and the charging request power corresponding to the DC module.

[0208] In some embodiments, the apparatus may further include a fourth processing module for determining a first electrical signal reference value based on a rated voltage of a power grid in an area where the power system is located, so as to enable an external device connected to the power system to operate normally.

[0209] In some embodiments, the fourth processing module may also be used to: The second electrical signal reference value is determined based on a sampling error of the first converter and / or a maximum electrical signal of an external device connected to the power system under normal operating conditions, and the first electrical signal reference value is smaller than the second electrical signal reference value.

[0210] In some embodiments, the fourth processing module may also be used to: The third electrical signal reference value is determined based on a sampling error of the first converter and / or a minimum electrical signal of an external device connected to the power system in a normal operating state, and the first electrical signal reference value is greater than the third electrical signal reference value.

[0211] In some embodiments, the fourth processing module may also be used to: According to the operating time period of the power system and / or the category of external equipment connected to the power system, at least one of the first electric signal reference value, the second electric signal reference value and the third electric signal reference value is set accordingly; wherein the second electric signal reference value is greater than the first electric signal reference value, and the first electric signal reference value is greater than the third electric signal reference value.

[0212] The power control device of the power system in the embodiment of the present application can be an electronic device, or a component in the electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal, or it can be other devices other than the terminal. Exemplarily, the electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted electronic device, a mobile Internet device (Mobile Internet Device, MID), an augmented reality (augmented reality, AR) / virtual reality (virtual reality, VR) device, a robot, a wearable device, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a netbook or a personal digital assistant (personal digital assistant, PDA), etc., and can also be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television (television, TV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application.

[0213] The power control device of the power system in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system, an IOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0214] The power control device of the power system provided in the embodiment of the present application can achieve Figures 1 to 21 To avoid repetition, the various processes implemented by the method embodiment are not described here.

[0215] An embodiment of the present application also provides a power system.

[0216] like Figure 2 As shown, the power conversion system includes: a first control module and at least one power conversion device.

[0217] Wherein, each power conversion device is connected to an AC coupling point respectively. Each power conversion device includes a first converter and at least one DC module, and the power conversion device is used to connect to an external device via the AC coupling point; each DC module is connected to the first converter via the DC coupling point respectively, and the first control module is connected to each first converter respectively.

[0218] The electric power system operates according to the power control method for the electric power system as described in any of the above embodiments.

[0219] According to the power system provided in the embodiment of the present application, the target AC signal for adjusting the first converter of the power conversion device is determined by the expected value of the DC side power response corresponding to the target power conversion device and the first electrical signal reference value of the AC coupling point to control the first converter, so as to adjust the power supply relationship between the power conversion devices so that the power conversion devices reach a balanced state.

[0220] In some embodiments, the DC module may include: a DC converter and a power generation device, a power consumption device or an energy storage device connected to the DC converter.

[0221] In some embodiments, the first control module may include a main control module and at least one sub-control module.

[0222] In this embodiment, the main control module is electrically connected to each sub-control module, and at least one sub-control module is arranged in a one-to-one correspondence with at least one power conversion device.

[0223] In some embodiments, the sub-control module may be a first converter in the power conversion device, or may be a controller in the first converter, etc.

[0224] The main control module can be an external control module independent of each power conversion device, such as Figure 2 The general dispatching unit shown in FIG. 1 may also be arranged inside any power conversion device, such as Figure 3 shown.

[0225] In the actual execution process, the execution logic of the main control module is as follows Figure 5 As shown, it is used to determine the first control signal, the second control signal and the third control signal according to the actual electrical signal of the AC coupling point and the first electrical signal reference value, the second electrical signal reference value and the third electrical signal reference value.

[0226] The execution logic of the sub-control module is as follows: Figure 6 and Figure 7 As shown, it is used to convert the first control signal into a first AC side scheduling parameter value for adjusting the first converter, convert the second control signal into a second AC signal for adjusting the first converter, and convert the third control signal into a third AC signal for adjusting the first converter according to the first converter parameter corresponding to the target power conversion device; determine the target AC signal corresponding to the target power conversion device to control the first converter according to the first AC side scheduling parameter value and the expected value of the DC side power response corresponding to the target power conversion device, and use the second AC signal and the third AC signal to limit the upper and lower thresholds of the target AC signal.

[0227] The specific control logic has been described in the above embodiments and will not be repeated here.

[0228] In some embodiments, Fig.23 As shown, an embodiment of the present application also provides an electronic device 2300, including a processor 2301, a memory 2302, and a computer program stored in the memory 2302 and executable on the processor 2301. When the program is executed by the processor 2301, each process of the power control method embodiment of the above-mentioned power system is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0229] It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above.

[0230] An embodiment of the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the various processes of the power control method embodiment of the above-mentioned power system are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0231] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0232] An embodiment of the present application also provides a computer program product, including a computer program, which implements the power control method of the above-mentioned power system when executed by a processor.

[0233] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0234] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the power control method embodiment of the above-mentioned power system, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0235] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0236] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0237] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0238] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

[0239] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0240] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A power control method for an electric power system, characterized in that: The power system includes at least one power conversion device and a first control module electrically connected to the power conversion device, and each of the power conversion devices is respectively connected to an AC coupling point; each of the power conversion devices includes a first converter and at least one DC module, and the power conversion device is used to connect to an external device via the AC coupling point; Each of the DC modules in the same power conversion device is connected to the first converter via a DC coupling point; the method comprises: The first control module obtains an expected DC side power response value corresponding to a target power conversion device in the at least one power conversion device; Determine a target AC electric signal corresponding to the target power conversion device according to an expected value of a DC side power response corresponding to the target power conversion device, an actual electric signal at the AC coupling point, and a first electric signal reference value at the AC coupling point; Based on the target AC power signal, the working state of the target power conversion device is controlled to adjust the power supply relationship between the power conversion devices.

2. The power control method of the electric power system according to claim 1, characterized in that: The step of determining a target AC electric signal corresponding to the target power conversion device according to an expected DC side power response value corresponding to the target power conversion device, an actual electric signal at the AC coupling point, and a first electric signal reference value at the AC coupling point comprises: Determining a first AC side scheduling parameter value according to an actual electrical signal at the AC coupling point and the first electrical signal reference value; A target AC power signal corresponding to the target power conversion device is determined according to the first AC side scheduling parameter value and the expected value of the DC side power response corresponding to the target power conversion device.

3. The power control method of the electric power system according to claim 2, characterized in that: The step of determining a target AC power signal corresponding to the target power conversion device according to the first AC side scheduling parameter value and the expected DC side power response value corresponding to the target power conversion device comprises: When the absolute value of the difference between the first AC side scheduling parameter value and the DC side power response expected value is less than a first threshold, determining the target AC power signal as the first AC side scheduling parameter value; When the absolute value of the difference between the first AC side scheduling parameter value and the DC side power response expected value is not less than a first threshold, the target AC power signal is determined as the DC side power response expected value.

4. The power control method of the electric power system according to claim 2, characterized in that: The step of determining a target AC power signal corresponding to the target power conversion device according to the first AC side scheduling parameter value and the expected DC side power response value corresponding to the target power conversion device comprises: Determining the target AC power signal based on the AC side scheduling parameter value and the DC side power response expected value; An upper limit and / or a lower limit threshold is set for the target AC power signal to correct the target AC power signal.

5. The power control method of the electric power system according to claim 4, characterized in that: The step of limiting the upper limit and / or lower limit threshold of the target AC power signal and correcting the target AC power signal includes: When the target AC signal is greater than a second AC signal, the target AC signal is updated to the second AC signal, wherein the second AC signal is determined based on the actual electrical signal and a second electrical signal reference value of the AC coupling point, and the second electrical signal reference value is greater than the first electrical signal reference value.

6. The power control method of the electric power system according to claim 4, characterized in that: The step of limiting the upper limit and / or lower limit threshold of the target AC power signal and correcting the target AC power signal includes: When the target AC power signal is smaller than a third AC power signal, the target AC power signal is updated to the third AC power signal, wherein the third AC power signal is determined based on the actual electrical signal and a third electrical signal reference value of the AC coupling point, and the third electrical signal reference value is smaller than the first electrical signal reference value.

7. The power control method of the electric power system according to claim 2, characterized in that: The determining, according to the actual electrical signal of the AC coupling point and the first electrical signal reference value, a first AC side scheduling parameter value comprises: Determining a first control signal according to the actual electrical signal at the AC coupling point and the first electrical signal reference value; According to the first converter parameter corresponding to the target power conversion device, the first control signal is converted into the first AC side scheduling parameter value for adjusting the first converter.

8. The power control method of the electric power system according to claim 7, characterized in that: The step of determining the first control signal according to the actual electrical signal at the AC coupling point and the first electrical signal reference value comprises: The first control signal is generated according to a first difference between the actual electrical signal and the first electrical signal reference value.

9. The power control method of the electric power system according to any one of claims 1 to 8, characterized in that: The controlling the working state of the target power conversion device based on the target AC power signal includes: Based on the target AC power signal and the actual electrical signal of the controlled point corresponding to the AC coupling point, the target power conversion device is closed-loop controlled.

10. The power control method of the electric power system according to claim 9, characterized in that: In the case where the power system includes one power conversion device, the actual electrical signal is obtained according to an AC side sampling signal and / or a gateway sampling signal of the power conversion device; In the case where the power system includes a plurality of the power conversion devices, the actual electrical signal is obtained according to an AC side sampling signal of at least one of the power conversion devices, an average value of the AC side sampling signals of the power conversion devices, and a gateway sampling signal.

11. The power control method of the electric power system according to any one of claims 1 to 8, characterized in that: The obtaining of the expected DC side power response value corresponding to the target power conversion device in the at least one power conversion device includes: Determining the expected value of the sub-DC side power response corresponding to each DC module according to the type of each DC module included in the target power conversion device; Based on the sum of the expected values ​​of the sub-DC side power responses corresponding to the DC modules, the expected value of the DC side power response corresponding to the target power conversion device is determined.

12. The power control method of the electric power system according to claim 11, characterized in that: The step of determining the expected sub-DC side power response value corresponding to each DC module according to the type of each DC module included in the target power conversion device includes: In the case where the DC module is a power generation device, the maximum power generation corresponding to the power generation device is determined as the expected value of the sub-DC side power response corresponding to the power generation device; In the case where the DC module is an electric device, the charging request power corresponding to the electric device is determined as the sub-DC side power response expected value corresponding to the electric device; In the case where the DC module is an energy storage device, the expected value of the sub-DC side power response corresponding to the energy storage device is determined according to the types of other DC modules connected to the energy storage device and the first AC side scheduling parameter value, wherein the first AC side scheduling parameter value is determined according to the actual electrical signal of the AC coupling point and the first electrical signal reference value.

13. The power control method of the electric power system according to claim 12, characterized in that: In the case where the DC module is an energy storage device, determining the expected value of the sub-DC side power response corresponding to the energy storage device according to the types of other DC modules connected to the energy storage device and the first AC side scheduling parameter value includes: When all other DC modules connected to the energy storage device are energy storage devices, or there are no other devices connected to the energy storage device, determine the expected value of the sub-DC side power response corresponding to the energy storage device according to the absolute value of the maximum charge and discharge power corresponding to the energy storage device, the absolute value of the first AC side scheduling parameter value, and the charge and discharge state corresponding to the maximum charge and discharge power; In the case where other DC modules connected to the energy storage device include at least one of the power generation device and the power consumption device, the energy storage scheduling power corresponding to the energy storage device is determined according to the first AC side scheduling parameter value and the expected value of the sub-DC side power response corresponding to each target module; the target module is the power generation device and / or the power consumption device connected to the energy storage device; Based on the energy storage dispatching power corresponding to the energy storage device, the charge and discharge state corresponding to the energy storage dispatching power, and the maximum charge and discharge power corresponding to the energy storage device, the expected value of the sub-DC side power response corresponding to the energy storage device is determined.

14. The power control method of the electric power system according to claim 11, characterized in that: The expected value of the sub-DC side power response corresponding to the DC module is determined according to at least one of the type of the DC module, the performance parameters of the DC module, the power scheduling of the DC module, and the charging request power corresponding to the DC module.

15. The power control method of the electric power system according to any one of claims 1 to 8, characterized in that: The first electrical signal reference value is determined based on the rated voltage of the power grid in the area where the power system is located, and is used to enable external equipment connected to the power system to operate normally.

16. The power control method of the electric power system according to any one of claims 1 to 8, characterized in that: The second electrical signal reference value is determined based on a sampling error of the first converter and / or a maximum electrical signal of an external device connected to the power system under normal operating conditions, and the first electrical signal reference value is smaller than the second electrical signal reference value.

17. The power control method of the electric power system according to any one of claims 1 to 8, characterized in that: The third electrical signal reference value is determined based on a sampling error of the first converter and / or a minimum electrical signal of an external device connected to the power system under normal operating conditions, and the first electrical signal reference value is greater than the third electrical signal reference value.

18. The power control method of the electric power system according to any one of claims 1 to 8, characterized in that: According to the operating time period of the power system and / or the category of external equipment connected to the power system, at least one of the first electric signal reference value, the second electric signal reference value and the third electric signal reference value is set accordingly; wherein the second electric signal reference value is greater than the first electric signal reference value, and the first electric signal reference value is greater than the third electric signal reference value.

19. A power control device for an electric power system, characterized in that: The power system includes at least one power conversion device, each of which is connected to an AC coupling point; each of the power conversion devices includes a first converter and at least one DC module, and the power conversion device is used to connect to an external device via the AC coupling point; Each of the DC modules in the same power conversion device is connected to the first converter via a DC coupling point; the device comprises: A first processing module, configured to obtain an expected DC side power response value corresponding to a target power conversion device in the at least one power conversion device; A second processing module, configured to determine a target AC electric signal corresponding to the target power conversion device according to an expected DC side power response value corresponding to the target power conversion device, an actual electric signal at the AC coupling point, and a first electric signal reference value at the AC coupling point; The third processing module is used to control the working state of the target power conversion device based on the target AC power signal to adjust the power supply relationship between the power conversion devices.

20. A power system, characterized in that: include: a first control module; At least one power conversion device, each of the power conversion devices is connected to an AC coupling point respectively; Each of the power conversion devices comprises a first converter and at least one DC module, and the power conversion device is used to be connected to an external device via the AC coupling point; each of the DC modules is respectively connected to the first converter via the DC coupling point, and the first control module is respectively connected to each of the first converters; The power system operates according to the power control method for a power system according to any one of claims 1-18.

21. The power system according to claim 20, characterized in that: The DC module comprises: DC converter; A power generation device, a power consumption device or an energy storage device connected to the DC converter.

22. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the power control method of the power system as described in any one of claims 1 to 18 is implemented.

23. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the power control method of the power system as claimed in any one of claims 1 to 18 is implemented.

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