Voltage stability control method and device for multi-path power supply system and energy storage system

Abstract

The invention provides a voltage stability control method and device for a multi-path power supply system and an energy storage system, and belongs to the technical field of power supply. The method comprises the following steps: acquiring operation parameters of an energy storage battery, actual operation voltage of each to-be-supported voltage node and preset voltage of each to-be-supported voltage node; according to the operation parameters of the energy storage battery, the actual operation voltage of each to-be-supported voltage node, the preset voltage of each to-be-supported voltage node and the power distribution proportion of the energy storage battery to each power module, determining a target power set value of each power module; and controlling each power module to output target power to each to-be-supported voltage node according to the target power set value. The power demand and the capacity demand of the energy storage device are not increased on the premise of ensuring the voltage stability of the direct current power supply system, so that the construction cost of the direct current power supply system is reduced.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a voltage stabilization control method, device and energy storage system for a multi-channel power supply system. Background Art

[0002] With the rapid development of the new energy industry, photovoltaic systems and energy storage batteries have been widely used. Among them, the electrical signals generated by photovoltaic systems and energy storage batteries are all DC signals. The current DC power supply system is widely used in rail transportation, data centers and other fields. The current DC power supply system is generally composed of multiple power supply systems with different voltages. In order to improve the power supply reliability of the DC power supply system, energy storage devices will be added to the current DC power supply system.

[0003] In the related art, a plurality of voltage stabilizing devices are usually added to the DC power supply system, and each voltage system with a different voltage is provided with a voltage stabilizing device that matches it. Each voltage stabilizing device outputs a corresponding operating power according to the voltage difference between a preset target voltage value and an actual voltage value at a voltage access point of each power supply system, so that the actual voltage value at the voltage access point of each power supply system is close to the preset target voltage value, thereby maintaining the voltage stability of the DC power supply system.

[0004] However, when maintaining the voltage stability of the DC power supply system based on relevant technologies, it is necessary to configure corresponding voltage stabilization devices for power supply systems with different voltages, which increases the power and capacity requirements of the DC power supply system for the additional energy storage devices, thereby increasing the construction cost of the DC power supply system. Summary of the invention

[0005] The purpose of the present application is to provide a voltage stabilization control method, device and energy storage system for a multi-power supply system, which can achieve the effect of ensuring the voltage stability of the DC power supply system without increasing the power demand and capacity demand of the energy storage device, thereby reducing the construction cost of the DC power supply system.

[0006] The embodiment of the present application is implemented as follows:

[0007] In a first aspect of an embodiment of the present application, a voltage stabilization control method for a multi-power supply system is provided, the method being applied to a controller in a voltage stabilization control device, the voltage stabilization control device comprising: a controller, an energy storage battery and a plurality of power modules that are communicatively connected to the controller, wherein one end of each power module is connected to the energy storage battery, and the other end of each power module is connected to a plurality of voltage nodes to be supported in each power supply system, the method comprising:

[0008] Obtaining the operating parameters of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, and the preset voltage of each voltage node to be supported;

[0009] Determine the target power setting value of each power module according to the operating parameters of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, the preset voltage of each voltage node to be supported, and the power allocation ratio of the energy storage battery to each power module;

[0010] Control each power module to output target power to each voltage node to be supported according to the target power setting value.

[0011] As a possible implementation, the operating parameters of the energy storage battery include: charge parameters and actual operating power. According to the operating parameters of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, the preset voltage of each voltage node to be supported, and the power allocation ratio of the energy storage battery to each power module, the target power setting value of each power module is determined, including:

[0012] Determine the target power setting of the energy storage battery according to the charge parameters of the energy storage battery and the preset operating power of the energy storage battery;

[0013] Determine the operating power deviation of the energy storage battery according to the target power setting of the energy storage battery and the actual operating power of the energy storage battery;

[0014] The target power setting value of each power module is determined according to the operating power deviation of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, the preset voltage of each voltage node to be supported and the power allocation ratio of the energy storage battery to each power module.

[0015] As a possible implementation method, according to the charge parameters of the energy storage battery and the preset operating power of the energy storage battery, the target power setting amount of the energy storage battery is determined, including:

[0016] Determine the charge deviation of the energy storage battery according to the actual charge running amount indicated by the charge parameter of the energy storage battery and the charge limit of the energy storage battery, the charge limit includes: an upper charge limit and a lower charge limit;

[0017] The target power setting amount of the energy storage battery is determined according to the charge deviation, the preset charge correction step length and the preset operating power of the energy storage battery.

[0018] As a possible implementation manner, the charge deviation of the energy storage battery is determined according to the actual charge operation amount indicated by the charge parameter of the energy storage battery and the charge limit of the energy storage battery, including:

[0019] Calculating a first difference between the actual charged running amount and the upper limit of the charged state, and performing a limiting process on the first difference to obtain the first difference after limiting;

[0020] Calculating a second difference between the actual charged running amount and the lower limit of the charged state, and performing a limiting process on the second difference to obtain a second difference after limiting;

[0021] Calculating a first sum between the first difference after clipping and the second difference after clipping;

[0022] A charge deviation between the actual charge running quantity and the charge limit value is determined based on the first sum value.

[0023] As a possible implementation method, the operating power deviation of the energy storage battery is determined according to the target power given amount of the energy storage battery and the actual operating power of the energy storage battery, including:

[0024] Calculating a third difference between the actual operating power of the energy storage battery and the target power given amount of the energy storage battery;

[0025] Calculating a second sum between the third difference and a given amount of historical power of the energy storage battery;

[0026] Based on the second sum, the operating power deviation of the energy storage battery is determined.

[0027] As a possible implementation method, according to the operating power deviation of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, the preset voltage of each voltage node to be supported, and the power allocation ratio of the energy storage battery to each power module, the target power setting value of each power module is determined, including:

[0028] Determine the voltage regulation coefficient of each voltage node to be supported according to the operating power deviation of the energy storage battery, the actual operating power of each power module and the power allocation ratio of the energy storage battery to each power module;

[0029] Determine a target voltage setting value of each voltage node to be supported according to a voltage adjustment coefficient of each voltage node to be supported, a preset voltage of each voltage node to be supported, and a voltage threshold range of each voltage node to be supported;

[0030] The target power setting value of each power module is determined according to the target voltage set value of each voltage node to be supported, the actual operating voltage of each voltage node to be supported, the actual operating power of each power module and the power allocation ratio of the energy storage battery to each power module.

[0031] As a possible implementation method, the voltage regulation coefficient of each voltage node to be supported is determined according to the operating power deviation of the energy storage battery, the actual operating power of each power module, and the power allocation ratio of the energy storage battery to each power module, including:

[0032] Determine the operating power proportion of each power module based on the actual operating power of each power module, the actual operating power of the energy storage battery, and the power allocation ratio of the energy storage battery to each power module;

[0033] The voltage regulation coefficient of each voltage node to be supported is determined according to the operating power proportion of each power module and the operating power deviation of the energy storage battery.

[0034] As a possible implementation method, according to the target voltage set value of each voltage node to be supported, the actual operating voltage of each voltage node to be supported, the actual operating power of each power module and the power allocation ratio of the energy storage battery to each power module, the target power setting value of each power module is determined, including:

[0035] Determine the voltage difference of each voltage node to be supported according to the actual operating voltage of each voltage node to be supported and the target voltage given amount of each voltage node to be supported;

[0036] Determining voltage correction parameters of each voltage node to be supported according to the voltage difference of each voltage node to be supported and a preset voltage adjustment step;

[0037] The target power setting value of each power module is determined according to the voltage correction parameters of each voltage node to be supported, the actual operating power of each power module, the power threshold range of each power module, the allocation ratio of the energy storage battery to each power module and the rated power of the energy storage battery.

[0038] According to a second aspect of an embodiment of the present application, a voltage stabilization control device is provided, the voltage stabilization control device comprising: a controller, and an energy storage battery and a plurality of power modules in communication with the controller;

[0039] The controller is used to execute the steps of the voltage stabilization control method of the multi-power supply system described in the first aspect above.

[0040] According to a third aspect of an embodiment of the present application, an energy storage system is provided, which includes the voltage stabilization control device described in the second aspect above, wherein a controller is respectively communicated with an energy storage battery and a plurality of power modules, wherein one end of each power module is connected to the energy storage battery, and the other end of each power module is respectively connected to a voltage node to be supported in each power supply system.

[0041] The beneficial effects of the embodiments of the present application include:

[0042] The embodiment of the present application provides a voltage stability control method for a multi-power supply system, which obtains the operating parameters of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, and the preset voltage of each voltage node to be supported in real time; according to the operating parameters of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, the preset voltage of each voltage node to be supported, and the power allocation ratio of the energy storage battery to each power module, the target power setting value of each power module is determined; the system controller controls each power module to output the corresponding target power to each voltage node to be supported according to the target power setting value, so that the voltage of each voltage node to be supported is balanced. Among them, each power supply system shares a voltage support device, and the controller in the voltage support device controls each power module and the energy storage battery to provide voltage support for each voltage node to be supported. In this way, it can achieve the effect of not increasing the power demand and capacity demand of the energy storage device under the premise of ensuring the voltage stability of the DC power supply system, thereby reducing the construction cost of the DC power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A schematic diagram of the line topology of an existing multi-channel power supply system;

[0045] Figure 2 A schematic diagram of the structure of a voltage stabilization control device for a multi-power supply system provided in an embodiment of the present application;

[0046] Figure 3 A flowchart of a first voltage stabilization control method for a multi-power supply system provided in an embodiment of the present application;

[0047] Figure 4 A flowchart of parameter initialization provided in an embodiment of the present application;

[0048] Figure 5 A flow chart of a second voltage stabilization control method for a multi-power supply system provided in an embodiment of the present application;

[0049] Figure 6 A schematic diagram of a voltage stabilization control loop of a multi-power supply system provided in an embodiment of the present application;

[0050] Figure 7A flowchart of a third voltage stabilization control method for a multi-power supply system provided in an embodiment of the present application;

[0051] Figure 8 A schematic diagram of a control loop for the operating power of an energy storage battery provided in an embodiment of the present application;

[0052] Fig. 9 A flowchart of a fourth voltage stabilization control method for a multi-power supply system provided in an embodiment of the present application;

[0053] Fig.10 A flowchart of a fifth voltage stabilization control method for a multi-power supply system provided in an embodiment of the present application;

[0054] Fig.11 A schematic diagram of a control loop for a voltage setting value of a voltage node to be supported provided in an embodiment of the present application;

[0055] Fig.12 A flowchart of a sixth voltage stabilization control method for a multi-power supply system provided in an embodiment of the present application;

[0056] Fig.13 A schematic diagram of a control loop for a power setting value of a power module provided in an embodiment of the present application;

[0057] Fig.14 A core algorithm flow chart of a voltage stabilization control method for a multi-power supply system provided in an embodiment of the present application;

[0058] Fig.15 A schematic diagram of the structure of an energy storage battery provided in an embodiment of the present application.

[0059] Description of the drawings: 10: voltage stabilization control device; 101: controller; 102: energy storage battery; 103: power module; 20: energy storage system. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0061] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0062] At present, it is common to add multiple voltage stabilization devices to the DC power supply system, and each voltage system with different voltages is equipped with a voltage stabilization device that matches it. Each voltage stabilization device outputs a corresponding operating power according to the voltage difference between the preset target voltage value and the actual voltage value of the voltage access point of each power supply system, so that the actual voltage value of the voltage access point of each power supply system is close to the preset target voltage value, thereby maintaining the voltage stability of the DC power supply system. However, this solution requires that each power supply system with different voltages be equipped with a corresponding voltage stabilization device, which increases the power and capacity requirements of the DC power supply system for the added energy storage device, thereby increasing the construction cost of the DC power supply system.

[0063] To this end, the embodiment of the present application provides a voltage stability control method for a multi-power supply system, by obtaining the operating parameters of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, and the preset voltage of each voltage node to be supported; according to the operating parameters of the energy storage battery, the power set quantity of the energy storage battery is corrected; according to the operating parameters and power set quantity of the energy storage battery, the preset voltage of the voltage node to be supported, and the actual operating power of each power module, the voltage set quantity of the voltage node to be supported is corrected; according to the voltage set quantity of the voltage node to be supported, the rated power of the energy storage battery, and the actual operating power of each power module, the target power setting value of each power module is adjusted; according to the target power setting value, the power module is controlled to output the target power to the voltage node to be supported. In this way, the power demand and capacity demand of the energy storage device are not increased under the premise of ensuring the voltage stability of the DC power supply system, thereby reducing the construction cost of the DC power supply system.

[0064] Figure 1 This is a schematic diagram of the line topology of an existing multi-channel power supply system, see Figure 1The main components of the line topology of the multi-way power supply system are: power supply, line impedance, load and energy storage device, wherein the power supply can generate a plurality of DC voltages UDC1, UDC2, ..., UDCm output power supply, the power supply can be one or more, and the power supply of each power supply system is relatively isolated; the line impedance Z1_1~Zm_1 is not an electronic device in the multi-way power supply system, the line impedance is the inherent property of the power supply line in the multi-way power supply system, due to the long power supply distance of the multi-way power supply system, when the load current passes through the line impedance, a certain voltage drop will be generated, and then the farther the distance between the load and the power supply, the lower the supply voltage of the voltage node where the load is located, and even exceeds the normal supply voltage range of the load; the load LD1_1~LDm_n refers to a general power supply load; the energy storage device is used to provide voltage support for the voltage nodes in the multi-way power supply system, and adjust the line voltage through the charging and discharging action of the energy storage device to achieve the effect of voltage stability, such as maintaining the supply voltage of the power supply line after the voltage node J or the voltage node k within the normal power supply range through the energy storage device.

[0065] The voltage stabilization control method and the voltage stabilization control device of the multi-power supply system provided in the embodiments of the present application are explained in detail below with reference to the accompanying drawings.

[0066] Figure 2 This is a schematic diagram of a voltage stabilization control device for a multi-power supply system provided by the present application, see Figure 2 A voltage stabilization control device 10 for a multi-power supply system provided in an embodiment of the present application is composed of a plurality of power modules ISO_DCDC1 to ISO_DCDCm, an energy storage battery BATTER, and a controller 101, wherein one end of each power module 103 is connected to the energy storage battery 102, and the other end of each power module 103 is respectively connected to a voltage node to be supported that needs voltage support in each power supply system, and each power module 103 and the energy storage battery 102 are both communicatively connected to the controller 101, and the controller 101 can take into account the charge operation state of the energy storage battery 102, the operating power of the energy storage battery 102, the voltage control range of each voltage node to be supported, and the power operation range of each power module 103 in real time, so that the voltage of each voltage node to be supported is stable and maintained within a reasonable working range, and ensure that each power module 103 and the energy storage battery 102 are operating within a normal operating power range.

[0067] Optionally, the voltage node to be supported is often set at a voltage node at two-thirds of each power supply system or at the rear one-third. The voltage node to be supported is used to indicate a voltage node of each power supply system that is prone to voltage imbalance. When voltage imbalance occurs at the voltage node to be supported, if there is surplus charge at the voltage node to be supported, the surplus charge can be transferred to the voltage node to be supported that is lacking in charge. At this time, there is no need for additional power supply from the energy storage battery 102; if the voltage nodes to be supported cannot be balanced with each other, power is supplied by the energy storage battery 102, and the power module 103 connected thereto outputs corresponding power to provide voltage support for the voltage node to be supported, so that the voltage of the voltage node to be supported is balanced.

[0068] It is worth noting that in a voltage stabilization control method for a multi-power supply system provided in an embodiment of the present application, priority is given to energy storage batteries not participating in the voltage support process of the voltage node to be supported, priority is given to load balancing between the voltage nodes to be supported, and when voltage balance cannot be achieved between the voltage nodes to be supported, energy storage batteries are introduced to power the power module, and then voltage support is provided to the voltage node to be supported via the power module.

[0069] Figure 3 This is a flow chart of a voltage stabilization control method for a multi-power supply system provided in the present application. This method can be applied to the controller in the above-mentioned voltage stabilization control device. Figure 3 The present application provides a voltage stabilization control method for a multi-power supply system, including:

[0070] S301, obtaining operating parameters of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, and the preset voltage of each voltage node to be supported.

[0071] Optionally, the controller in the voltage stabilization control device monitors in real time the actual operating voltage of the voltage node to be supported in each power supply system, the operating parameters of the energy storage battery and the actual operating power of each power module based on wireless communication technology.

[0072] Optionally, the operating parameters of the energy storage battery refer to some electrical parameter information generated by the energy storage battery during operation. The operating parameters of the energy storage battery include: actual charge of the energy storage battery, actual operating power and other electrical parameters, which are not specifically limited in this application.

[0073] Optionally, the actual operating power of each power module is used to indicate the operating power of each power module at the current moment or the output power to the voltage node to be supported by it, the actual operating voltage of each voltage node to be supported is used to indicate the voltage value of each voltage node to be supported at the current moment, and the preset voltage of the voltage node to be supported refers to the preset voltage that the voltage node to be supported needs to reach.

[0074] It is worth noting that when the voltage node to be supported connected to the power module does not need voltage support or charge transfer, the actual operating power of the power module connected to the voltage node to be supported may also be 0, and the power module is in a standby state.

[0075] S302, determining a target power setting value for each power module according to the operating parameters of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, the preset voltage of each voltage node to be supported, and the power allocation ratio of the energy storage battery to each power module.

[0076] Optionally, the power distribution ratio of the energy storage battery to each power module is a distribution ratio preset by the controller, and the power distribution ratio is usually set as an equal proportional coefficient.

[0077] Optionally, the controller calculates the target power setting value corresponding to each power module based on the real-time operating parameters of the energy storage battery, the actual operating power of each power module at the current moment, the actual operating voltage of each voltage node to be supported at the current moment, the preset voltage expected to be achieved by each voltage node to be supported, and the power allocation ratio of the energy storage battery to each power module.

[0078] S303 , controlling each power module to output a target power to each voltage node to be supported according to a target power setting value.

[0079] Optionally, the controller controls the power module to operate at the operating power indicated by the target power setting value according to the target power setting value, so that the power module outputs the target power to the voltage node to be supported. The control instruction refers to a control signal sent by the controller to the power module, and the power module responds to the control instruction sent by the controller to provide the target power to the voltage node to be supported, and the target power refers to the power indicated by the target power setting value.

[0080] In an embodiment of the present application, the operating parameters of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, and the preset voltage of each voltage node to be supported are obtained in real time; the target power setting value of each power module is determined according to the operating parameters of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, the preset voltage of each voltage node to be supported, and the power allocation ratio of the energy storage battery to each power module; the system controller controls each power module to output the corresponding target power to each voltage node to be supported according to the target power setting value, so that the voltage of each voltage node to be supported is balanced. Among them, each power supply system shares a voltage support device, and the controller in the voltage support device controls each power module and the energy storage battery to provide voltage support for each voltage node to be supported. In this way, it is possible to achieve the effect of not increasing the power demand and capacity demand of the energy storage device while ensuring the voltage stability of the DC power supply system, thereby reducing the construction cost of the DC power supply system.

[0081] In an optional implementation manner, before voltage support is performed on the voltage node to be supported, parameters of each power module, energy storage battery and each voltage node to be supported in the voltage stabilization control device need to be initialized. Figure 4 A flowchart of parameter initialization provided for this application, see Figure 4In a parameter initialization process provided in an embodiment of the present application, the correction boundary of the state of charge of the energy storage battery [Soc_bat_lmt1, Soc_bat_lmt2] is used to limit the correction range of the state of charge of the energy storage battery, Soc_bat_lmt1 is used to indicate the lower limit of the charge of the energy storage battery, Soc_bat_lmt2 is used to indicate the upper limit of the charge of the energy storage battery, and the charge correction step length SocErrStep_bat_set of the energy storage battery is used to indicate the amplitude of a single charge correction of the energy storage battery. The energy storage battery is adjusted based on the charge limit value and the charge correction step length of the energy storage battery. The initial state of charge can effectively avoid the problem of overcharging or over-discharging of the energy storage battery; the energy storage target power Pow_bat_set of the energy storage battery is used to indicate the preset operating power of the energy storage battery, the power adjustment step PowErrStep_bat_set of the energy storage battery is used to indicate the amplitude of the single operation power adjustment of the energy storage battery, and the rated power Pow_bat_rate of the energy storage battery is used to indicate the normal operating power of the energy storage battery. The initial operating power of the energy storage battery is adjusted based on the preset operating power, rated power and power adjustment step of the energy storage battery; the preset voltage U of the voltage node to be supported pcc_dcdcm_set is used to indicate the preset voltage value of the voltage node to be supported, the voltage adjustment step size UdcErrStep_dcdcm_set of the voltage node to be supported is used to indicate the amplitude of the single voltage adjustment of the voltage node to be supported, the voltage range of the voltage node to be supported [Udcm_pcc_lmt1, Udcm_pcc_lmt2] is used to indicate the normal working range of the voltage node to be supported, Udcm_pcc_lmt1 is used to indicate the voltage lower limit of the voltage node to be supported, and Udcm_pcc_lmt2 is used to indicate the voltage The voltage of the voltage node to be supported is initialized according to the preset voltage value, voltage adjustment step and voltage range of the voltage node to be supported; the power range of the power module [Pow_dcdcm_lmt1, Pow_dcdcm_lmt2] is used to indicate the normal operating power range of the power module, Pow_dcdcm_lmt1 is used to indicate the lower limit of the operating power of the power module, and Pow_dcdcm_lmt2 is used to indicate the upper limit of the operating power of the power module. The operating power of the power module is initialized based on the power range of the power module to prevent the power module from exceeding the operating power limit.

[0082] Among them, it is determined whether the remaining power of the energy storage battery is in a normal charge state at the current moment according to the charge limit of the energy storage battery, and the current charge state of the energy storage battery is corrected according to the charge correction step length of the energy storage battery, so that the energy storage battery is in a normal working charge range before the voltage stabilization control device provides voltage support for the voltage nodes to be supported of each power circuit in the multi-way power supply system; according to the preset operating power of the energy storage battery and the rated power of the energy storage battery, and according to the power adjustment step length of the energy storage battery, the operating power of the energy storage battery is adjusted, so that the operating power of the energy storage battery is in a normal state before the voltage stabilization control device provides voltage support for the voltage nodes to be supported of each power circuit in the multi-way power supply system. within the working power range; the voltage range of the voltage node to be supported is used to indicate the voltage range for normal operation of the voltage node to be supported, and the operating voltage of the voltage node to be supported is adjusted according to the preset voltage value of the voltage node to be supported and the voltage range of the voltage node to be supported, and according to the voltage adjustment step of the voltage node to be supported, so that the operating voltage of the voltage node to be supported is within the normal voltage range; the power range of the power module is used to indicate the normal operating power range of the power module, and the operating power of the power module is initialized according to the power range of the power module, so that the power module is within the normal operating power range before the voltage stabilization control device provides voltage support for the voltage nodes to be supported of each power supply circuit in the multi-way power supply system.

[0083] For a possible implementation, see Figure 5 The operating parameters of the energy storage battery include: charge parameters and actual operating power. The operation of step S302 may specifically be:

[0084] S501. Determine a target power setting of the energy storage battery according to a charge parameter of the energy storage battery and a preset operating power of the energy storage battery.

[0085] Optionally, the actual operating power of the energy storage battery is used to indicate the operating power or output power of the energy storage battery at the current moment, and the charge parameter of the energy storage battery is used to indicate the actual charge operating capacity of the energy storage battery. The actual charge operating capacity of the energy storage battery can be represented by SOC. When SOC=0, it indicates that the energy storage battery in the energy storage battery is fully discharged; when SOC=1, it indicates that the energy storage battery in the energy storage battery is fully charged; the actual charge operating capacity of the energy storage battery is used to indicate the ratio of the current remaining power of the energy storage battery in the energy storage battery to the power of the energy storage battery in the fully charged state. The actual charge operating capacity of the energy storage battery is usually expressed as a percentage, and the actual charge operating capacity of the energy storage battery is between 0% and 100%, such as the actual charge operating capacity of the energy storage battery is 60%.

[0086] It is worth noting that when the energy storage battery does not participate in the voltage supporting process of the voltage node to be supported, the actual operating power of the energy storage battery may be 0, that is, the energy storage battery stops operating.

[0087] Optionally, the preset operating power of the energy storage battery refers to the pre-set operating power of the energy storage battery, and the target power set amount is the operating power that the energy storage battery needs to provide, calculated by the controller based on the actual charge parameters, charge limit, charge correction step and preset operating power of the energy storage battery, and the controller controls the operating state of the energy storage battery based on the target power set amount.

[0088] S502: Determine an operating power deviation of the energy storage battery according to a target power setting of the energy storage battery and an actual operating power of the energy storage battery.

[0089] Optionally, the operating power deviation of the energy storage battery is used to indicate the degree of deviation between the actual operating power of the energy storage battery at the current moment and the operating power indicated by the calculated target power given amount.

[0090] Optionally, the operating power deviation of the energy storage battery may be determined according to a comparison result between the target power setting amount of the energy storage battery and the actual operating power of the energy storage battery.

[0091] S503, determining a target power setting value for each power module according to the operating power deviation of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, the preset voltage of each voltage node to be supported, and the power allocation ratio of the energy storage battery to each power module.

[0092] In an optional implementation, Figure 6 A schematic diagram of a voltage stabilization control loop of a multi-power supply system provided in this application, see Figure 6 The voltage stabilization control loop provided in the embodiment of the present application preferentially calculates the voltage deviation between the target voltage set value Udcm_ref of the voltage node to be supported and the actual operating voltage Udcm_bak of the voltage node to be supported, and then controls the power module DCDCm through the PI control loop to provide the target power for the voltage node to be supported Udcm_pcc according to the power indicated by the target power setting value. Among them, the controller sends a control instruction to the power module DCDCm according to the calculated target power setting value. After receiving the control instruction, the power module DCDCm injects the target power into the voltage node to be supported Udcm_pcc, and adjusts the voltage of the Zm impedance through the power supply circuit, thereby achieving voltage stability of the voltage node to be supported.

[0093] It is worth noting that the target voltage given quantity Udcm_ref of the voltage node to be supported is adjusted to realize the control of the target power setting value Pm_set of the power module DCDCm, which generally presents a negative correlation. When the target voltage given quantity Udcm_ref of the voltage node to be supported increases, the target power setting value Pm_set of the power module DCDCm will decrease, and the target power setting value Pm_set mainly shows a reverse decreasing trend; the power interaction between each power module DCDCm in the voltage stability control device and each voltage node Udcm_pcc to be supported in the multi-channel power supply system will flow through the energy storage battery BATTER, and the operating power of the energy storage battery BATTER is the sum of the operating powers of each power module DCDCm in the voltage stability control device; when it is necessary to adjust the operating power of the energy storage battery BATTER, it can be achieved by adjusting the target voltage given quantity Udcm_ref of the voltage node to be supported.

[0094] For a possible implementation, see Figure 7 The operation of step S501 may specifically be:

[0095] S701. Determine a charge deviation of the energy storage battery according to an actual charge operation amount indicated by a charge parameter of the energy storage battery and a charge limit of the energy storage battery. The charge limit includes an upper charge limit and a lower charge limit.

[0096] Optionally, the charge limit of the energy storage battery includes an upper charge limit and a lower charge limit of the energy storage battery. The charge limit of the energy storage battery is used to indicate the range of normal charging and discharging of the energy storage battery. When the actual state of charge of the energy storage battery exceeds the lower charge limit, it indicates that the energy storage battery is in an over-discharge state; when the actual state of charge of the energy storage battery exceeds the upper charge limit, it indicates that the energy storage battery is in an overcharge state. According to the actual state of charge and the charge limit of the energy storage battery, it can be determined whether the current remaining power of the energy storage battery is in a normal remaining power range or a safe remaining power range.

[0097] Optionally, the actual charged running capacity is used to indicate the remaining power of the energy storage battery at the current moment. The actual charged running capacity indicated by the actual charge state of the energy storage battery can be 10%, 40%, 60%, etc., and this application does not make specific limitations on this.

[0098] Optionally, the charge limit of the energy storage battery is used to indicate the safe remaining power of the energy storage battery when it is operating normally. The lower charge limit of the energy storage battery may be %, 10%, etc., and the upper charge limit of the energy storage battery may be 80%, 90%, etc., which is not specifically limited in this application. It is worth noting that the lower charge limit of the energy storage battery is less than the upper charge limit of the energy storage battery.

[0099] Optionally, the charge deviation is used to indicate a deviation between an actual charge running capacity of the energy storage battery and an upper charge limit and a deviation between an actual charge running capacity of the energy storage battery and a lower charge limit.

[0100] S702: Determine a target power setting of the energy storage battery according to the charge deviation, the preset charge correction step length, and the preset operating power of the energy storage battery.

[0101] Optionally, the preset charge correction step size is used to indicate the amplitude of each correction of the charge state of the energy storage battery, that is, the charge correction speed of the energy storage battery. For example, if the charge correction step size of the energy storage battery is 10%, the charge state of the energy storage battery increases or decreases by 10% each time the charge state is corrected.

[0102] In a possible implementation, the operation of step S501 may specifically be:

[0103] Calculating a first difference between the actual charged running amount and the upper limit of the charged state, and performing a limiting process on the first difference to obtain the first difference after limiting;

[0104] Calculating a second difference between the actual charged running amount and the lower limit of the charged state, and performing a limiting process on the second difference to obtain a second difference after limiting;

[0105] Calculating a first sum between the first difference after clipping and the second difference after clipping;

[0106] A charge deviation between the actual charge running quantity and the charge limit value is determined based on the first sum value.

[0107] Optionally, the second difference is limited according to a power threshold range of the energy storage battery, so that the limited second difference is within a safe operating range of the energy storage battery.

[0108] In an optional implementation, Figure 8 A schematic diagram of a control loop for the operating power of an energy storage battery provided in this application, see Figure 8In the control loop of the operating power of the energy storage battery provided in the embodiment of the present application, the charge deviation between the actual state of charge of the energy storage battery and the charge limit of the energy storage battery is judged based on the actual state of charge SOC_bat_run of the energy storage battery and the charge limit [Soc_bat_lmt1, Soc_bat_lmt2] of the energy storage battery, and the charge deviation is limited, and then the product of the charge deviation after the limit processing and the charge adjustment step SocErrStep_bat_set of the energy storage battery is calculated, and then the product and the preset operating power Pow_bat_set of the energy storage battery are calculated to achieve the target power set amount Pow_bat_ref of the corrected energy storage battery. Among them, when the actual state of charge SOC_bat_run of the energy storage battery is higher than the upper charge limit Soc_bat_lmt2 of the energy storage battery, the target power given amount Pow_bat_ref of the energy storage battery decreases; when the actual state of charge SOC_bat_run of the energy storage battery is lower than the lower charge limit Soc_bat_lmt1 of the energy storage battery, the target power given amount Pow_bat_ref of the energy storage battery increases.

[0109] It is worth noting that the charge adjustment step SocErrStep_bat_set of the energy storage battery is generally a positive value.

[0110] In a possible implementation, the operation of step S502 may specifically be:

[0111] Calculating a third difference between the actual operating power of the energy storage battery and the target power given amount of the energy storage battery;

[0112] Calculating a second sum between the third difference and a given amount of historical power of the energy storage battery;

[0113] Based on the second sum, the operating power deviation of the energy storage battery is determined.

[0114] Optionally, the historical power setting of the energy storage battery is used to indicate the target power setting of the energy storage battery calculated by the controller most recently, that is, the last target power setting of the energy storage battery.

[0115] For a possible implementation, see Fig. 9 The operation of step S503 may specifically be:

[0116] S901. Determine a voltage regulation coefficient of each voltage node to be supported according to an operating power deviation of an energy storage battery, an actual operating power of each power module, and a power allocation ratio of the energy storage battery to each power module.

[0117] Optionally, the voltage regulation coefficient refers to the coefficient product of the preset voltage of the voltage node to be supported, and the controller calculates the voltage regulation coefficient of the voltage node to be supported based on the operating power deviation of the energy storage battery, the actual operating power of each power module, and the power allocation ratio of the energy storage battery to each power module.

[0118] S902 : Determine a target voltage setting value of each voltage node to be supported according to a voltage adjustment coefficient of each voltage node to be supported, a preset voltage of each voltage node to be supported, and a voltage threshold range of each voltage node to be supported.

[0119] Optionally, the voltage threshold range is used to indicate the voltage operating range of each voltage node to be supported when working normally. The target voltage set value of the voltage node to be supported is calculated by the controller based on the voltage regulation coefficient of the voltage node to be supported, the preset voltage of the voltage node to be supported and the voltage threshold range of the voltage node to be supported. The controller controls the energy storage battery and each power module associated with the voltage node to be supported to provide voltage support for the voltage node to be supported based on the target voltage set value, so that the voltage of the voltage node to be supported finally reaches the voltage value indicated by the target voltage set value.

[0120] Optionally, when the actual operating voltage Udcm_pcc_run of the voltage node to be supported is higher than the target voltage given value Udcm_pcc_ref of the voltage node to be supported, the target power setting value Pow_dcdcm_set of the power module increases; when the actual operating voltage Udcm_pcc_run of the voltage node to be supported is lower than the target voltage given value Udcm_pcc_ref of the voltage node to be supported, the target power setting value Pow_dcdcm_set of the power module decreases.

[0121] It is worth noting that the preset voltage regulation step UdcErrStep_dcdcm_set is generally a positive value.

[0122] S903, determining a target power setting value for each power module according to the target voltage set value of each voltage node to be supported, the actual operating voltage of each voltage node to be supported, the actual operating power of each power module, and the power allocation ratio of the energy storage battery to each power module.

[0123] For a possible implementation, see Fig.10 The operation of step S901 may specifically be:

[0124] S1001. Determine the operating power proportion of each power module according to the actual operating power of each power module, the actual operating power of the energy storage battery, and the power allocation ratio of the energy storage battery to each power module.

[0125] Optionally, the operating power proportion refers to the proportion of the power provided by each power module in the target power injected into the voltage node to be supported.

[0126] S1002: Determine a voltage regulation coefficient of each voltage node to be supported according to the operating power proportion of each power module and the operating power deviation of the energy storage battery.

[0127] Optionally, a voltage regulation coefficient of a preset voltage of the voltage node to be supported is calculated according to the operating power proportion of each power module in the target power injected into the voltage node to be supported and the operating power deviation of the energy storage battery.

[0128] Fig.11 A schematic diagram of a control loop for a voltage setting value of a voltage node to be supported provided by the present application, see Fig.11 In the control loop of the voltage setting value of the voltage node to be supported provided in the embodiment of the present application, the power deviation between the actual operating power Pow_bat_run of the energy storage battery at the current moment and the target power given amount Pow_bat_ref of the energy storage battery at the current moment is preferentially calculated; the operating power deviation Pow_bat_err between the power deviation between the actual operating power and the target power given amount and the target power given amount Pow_bat_ref1 of the energy storage battery at the previous moment before the current moment is calculated; the actual operating power Pow_dcdcm_run of each power module DCDCm providing voltage support for the voltage node to be supported is calculated, and the actual operating power of each power module DCDCm is calculated by ABS. The absolute value of the rate is taken to obtain the absolute value of the operating power |Pow_dcdcm_run| of each power module DCDCm, and then the power proportion of the absolute value of the operating power of each power module DCDCm in the power injected into the voltage node to be supported is calculated, and the operating power is reallocated to each power module DCDCm according to the proportional distribution coefficient; the product of the operating power deviation Pow_bat_err of the energy storage battery and the reallocated operating power of each power module DCDCm is calculated, and then the sum of the product and the preset voltage Upcc_dcdcm_set of the voltage node to be supported is calculated, and the sum after the limiting processing is used as the target voltage given quantity Udcm_pcc_ref of the voltage node to be supported. Among them, when the actual operating power Pow_bat_run of the energy storage battery at the current moment is higher than the target power given amount Pow_bat_ref of the energy storage battery, the target voltage given amount Udcm_pcc_ref of the voltage node to be supported increases; when the actual operating power Pow_bat_run of the energy storage battery at the current moment is lower than the target power given amount Pow_bat_ref of the energy storage battery, the target voltage given amount Udcm_pcc_ref of the voltage node to be supported decreases.

[0129] For a possible implementation, see Fig.12 The operation of step S903 may specifically be:

[0130] S1201. Determine a voltage difference of each voltage node to be supported according to an actual operating voltage of each voltage node to be supported and a target voltage setting of each voltage node to be supported.

[0131] Optionally, the voltage difference value is used to indicate the voltage difference between the actual operating voltage of the voltage node to be supported at the current moment and the calculated target voltage given value.

[0132] S1202: Determine a voltage correction parameter of each voltage node to be supported according to a voltage difference of each voltage node to be supported and a preset voltage adjustment step.

[0133] Optionally, the preset voltage adjustment step is used to indicate the single voltage adjustment amplitude of the voltage node to be supported; the voltage correction parameter is used to indicate the voltage adjustment parameter of the voltage node to be supported, and the voltage correction parameter may include: corrected voltage value, corrected voltage amplitude, etc., which is not specifically limited in this application.

[0134] S1203, determining a target power setting value for each power module according to the voltage correction parameter of each voltage node to be supported, the actual operating power of each power module, the power threshold range of each power module, the allocation ratio of the energy storage battery to each power module, and the rated power of the energy storage battery.

[0135] Optionally, the rated power of the energy storage battery is used to indicate the operating power of the energy storage battery when it is operating normally. If the actual operating power of the energy storage battery is greater than the rated power of the energy storage battery, the energy storage battery will be damaged. If the actual operating power of the energy storage battery is less than the rated power of the energy storage battery, the energy storage battery will not be able to operate normally.

[0136] Fig.13 A schematic diagram of a control loop for a power setting value of a power module provided in this application, see Fig.13In the control loop of the power setting value of the power module provided in the embodiment of the present application, the voltage deviation between the actual operating voltage Udcm_pcc_run of the voltage node to be supported and the target voltage given value Udcm_pcc_ref of the voltage node to be supported is calculated, and then the product of the voltage deviation and the voltage adjustment step UdcErrStep_dcdcm_set of the voltage node to be supported is calculated, and then the sum of the product and the actual operating power Pow_dcdcm_run of the power module is calculated, and the sum is limited based on the power range of the power module, and the limited sum is proportionally distributed to obtain the distribution ratio of the power module; the quotient of the rated power of the energy storage battery and the power ratio coefficient of the power module is calculated, and the product of the quotient and the limited sum is calculated, and the product is used as the target power setting value of the power module. Among them, the actual operating power Pow_dcdcm_run of each power module in the voltage stability control device flows through the energy storage battery BATTER, that is, it is necessary to compare the operating power sum of each power module with the rated power Pow_bat_rate of the energy storage battery. When the operating power sum of each power module exceeds the rated power Pow_bat_rate limit of the energy storage battery, the power proportion of each power module is readjusted according to the proportional coefficient to obtain the target power setting value Pow_dcdcm_set of the power module.

[0137] In an optional implementation, Fig.14 The core algorithm flow chart of the voltage stability control method of a multi-power supply system provided in this application is shown in Fig.14 In the voltage stabilization control core algorithm of the multi-power supply system provided in the embodiment of the present application, the actual state of charge of the energy storage battery, the actual operating power of the energy storage battery, the actual operating voltage of each voltage node to be supported, and the operating power of each power module are preferentially initialized; then the actual operating power of the energy storage battery is controlled, and then the target voltage set value of the voltage node to be supported is set, and finally the target power setting value of the power module is controlled, and the target power is injected into the voltage node to be supported via the power module, so that the voltage of the voltage node to be supported is stable.

[0138] Fig.15 is a schematic diagram of the structure of an energy storage system provided in an embodiment of the present application, see Fig.15 The energy storage system 20 includes: a voltage stabilization control device 10, the voltage stabilization control device 10 includes: a controller 101, an energy storage battery 102 and a plurality of power modules 103 which are communicatively connected to the controller, wherein one end of each power module 103 is connected to the energy storage battery 102, and the other end of each power module 103 is respectively connected to a voltage node to be supported in each power supply system, and the controller 101 is used to implement the steps in any of the above method embodiments.

[0139] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0140] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A voltage stabilization control method for a multi-power supply system, characterized in that: The method is applied to a controller in a voltage stabilization control device, the voltage stabilization control device comprising: the controller, and an energy storage battery and a plurality of power modules that are communicatively connected to the controller, wherein one end of each of the power modules is connected to the energy storage battery, and the other end of each of the power modules is connected to a plurality of voltage nodes to be supported in each power supply system, the method comprising: Obtaining the operating parameters of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, and the preset voltage of each voltage node to be supported; Determine the target power setting value of each power module according to the operating parameters of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, the preset voltage of each voltage node to be supported, and the power allocation ratio of the energy storage battery to each power module; Each of the power modules is controlled to output a target power to each of the voltage nodes to be supported according to the target power setting value.

2. The voltage stabilization control method of a multi-power supply system according to claim 1, characterized in that: The operating parameters of the energy storage battery include: charge parameters and actual operating power. The target power setting value of each power module is determined according to the operating parameters of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, the preset voltage of each voltage node to be supported, and the power allocation ratio of the energy storage battery to each power module, including: Determining a target power setting amount of the energy storage battery according to the charge parameters of the energy storage battery and the preset operating power of the energy storage battery; Determining an operating power deviation of the energy storage battery according to a target power setting of the energy storage battery and an actual operating power of the energy storage battery; The target power setting value of each power module is determined according to the operating power deviation of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, the preset voltage of each voltage node to be supported and the power allocation ratio of the energy storage battery to each power module.

3. The voltage stabilization control method of a multi-power supply system according to claim 2, characterized in that: The step of determining a target power setting amount of the energy storage battery according to the charge parameter of the energy storage battery and the preset operating power of the energy storage battery includes: Determining a charge deviation of the energy storage battery according to an actual charge running amount indicated by a charge parameter of the energy storage battery and a charge limit of the energy storage battery, wherein the charge limit includes an upper charge limit and a lower charge limit; The target power setting amount of the energy storage battery is determined according to the charge deviation, the preset charge correction step length and the preset operating power of the energy storage battery.

4. The voltage stabilization control method for a multi-power supply system according to claim 3, characterized in that: The step of determining the charge deviation of the energy storage battery according to the actual charge running amount indicated by the charge parameter of the energy storage battery and the charge limit of the energy storage battery comprises: Calculating a first difference between the actual charged running amount and the upper charge limit, and performing a limiting process on the first difference to obtain a first difference after limiting; Calculating a second difference between the actual charged running amount and the charged lower limit, and performing a limiting process on the second difference to obtain a second difference after limiting; Calculating a first sum between the first difference after clipping and the second difference after clipping; A charge deviation between the actual charge running amount and the charge limit value is determined according to the first sum value.

5. The voltage stabilization control method for a multi-power supply system according to claim 2, characterized in that: The step of determining the operating power deviation of the energy storage battery according to the target power setting of the energy storage battery and the actual operating power of the energy storage battery includes: Calculating a third difference between the actual operating power of the energy storage battery and the target power given amount of the energy storage battery; Calculating a second sum between the third difference and a given amount of historical power of the energy storage battery; The operating power deviation of the energy storage battery is determined according to the second sum value.

6. The voltage stabilization control method for a multi-power supply system according to claim 2, characterized in that: The step of determining a target power setting value of each power module according to the operating power deviation of the energy storage battery, the actual operating power of each power module, the actual operating voltage of each voltage node to be supported, the preset voltage of each voltage node to be supported, and the power allocation ratio of the energy storage battery to each power module comprises: Determine the voltage regulation coefficient of each voltage node to be supported according to the operating power deviation of the energy storage battery, the actual operating power of each power module and the power allocation ratio of the energy storage battery to each power module; Determining a target voltage setting amount of each of the voltage nodes to be supported according to a voltage adjustment coefficient of each of the voltage nodes to be supported, a preset voltage of each of the voltage nodes to be supported, and a voltage threshold range of each of the voltage nodes to be supported; The target power setting value of each power module is determined according to the target voltage set value of each voltage node to be supported, the actual operating voltage of each voltage node to be supported, the actual operating power of each power module and the power allocation ratio of the energy storage battery to each power module.

7. The voltage stabilization control method for a multi-power supply system according to claim 6, characterized in that: The step of determining the voltage regulation coefficient of each voltage node to be supported according to the operating power deviation of the energy storage battery, the actual operating power of each power module, and the power allocation ratio of the energy storage battery to each power module includes: Determine the operating power proportion of each power module according to the actual operating power of each power module, the actual operating power of the energy storage battery, and the power allocation ratio of the energy storage battery to each power module; The voltage regulation coefficient of each voltage node to be supported is determined according to the operating power proportion of each power module and the operating power deviation of the energy storage battery.

8. The voltage stabilization control method for a multi-power supply system according to claim 6, characterized in that: The determining of the target power setting value of each power module according to the target voltage set value of each voltage node to be supported, the actual operating voltage of each voltage node to be supported, the actual operating power of each power module and the power allocation ratio of the energy storage battery to each power module includes: Determining a voltage difference of each of the voltage nodes to be supported according to an actual operating voltage of each of the voltage nodes to be supported and a target voltage given value of each of the voltage nodes to be supported; Determining a voltage correction parameter of each of the voltage nodes to be supported according to the voltage difference of each of the voltage nodes to be supported and a preset voltage adjustment step; The target power setting value of each power module is determined according to the voltage correction parameters of each voltage node to be supported, the actual operating power of each power module, the power threshold range of each power module, the allocation ratio of the energy storage system to each power module and the rated power of the energy storage battery.

9. A voltage stabilization control device, characterized in that: The voltage stabilization control device comprises: the controller, and an energy storage battery and a plurality of power modules which are communicatively connected to the controller; The controller is used to execute the steps of the method according to any one of claims 1 to 8.

10. An energy storage system, characterized in that: The energy storage system includes the voltage stabilization control device according to claim 9, and the controller is communicatively connected to the energy storage battery and multiple power modules respectively, wherein one end of each of the power modules is connected to the energy storage battery, and the other end of each of the power modules is respectively connected to the voltage nodes to be supported in each power supply system.

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