Power control method, control device, readable storage medium and energy storage converter

Abstract

The invention provides a power control method, a control device, a readable storage medium and an energy storage converter. The power control method comprises the steps of obtaining target control power of a power grid and a current power value of the power grid; determining target power of the energy storage converter based on the target control power and the current power value; obtaining the current operation power of the energy storage converter; and determining the working power of the energy storage component based on the target power and the current operation power. According to the power control method, the working power of the energy storage assembly is determined according to the actual working condition of the power grid, accurate control over the power on the power grid can be achieved, and therefore the control precision of the power on the power grid is improved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a power control method, a control device, a readable storage medium and an energy storage converter. Background Art

[0002] Household energy storage converters mostly calculate control work based on the law of conservation of energy, such as calculating power difference based on the law of conservation of energy, and calculating control power based on the power difference.

[0003] However, the control process of the energy storage converter also involves losses, wherein the losses include power damage of the positive electrode and error losses caused by calculation errors.

[0004] Among them, power loss is the energy lost in the form of heat, electromagnetic energy and other non-electric energy during the operation of the whole machine. This power loss is related to the inverter power, hardware component errors, whole machine assembly process, working environment and other conditions, and cannot be calculated in real time. The error loss caused by the calculation error means that the current / voltage sampling sensor itself has a certain error, which will indirectly lead to a certain deviation in the calculated power.

[0005] Obviously, the existence of utilization loss makes the power difference calculated under the energy conservation inaccurate, which makes the control accuracy of the energy storage converter relatively low. Summary of the invention

[0006] The present invention aims to at least solve the technical problem existing in the prior art or related art that the existence of utilization loss makes the power difference calculated under energy conservation inaccurate, resulting in relatively low control accuracy of the energy storage converter.

[0007] To this end, a first aspect of the present invention is to provide a power control method.

[0008] A second aspect of the present invention provides a power control device.

[0009] A third aspect of the present invention provides another power control device.

[0010] A fourth aspect of the present invention provides a readable storage medium.

[0011] A fifth aspect of the present invention is to provide an energy storage converter.

[0012] In view of this, according to the first aspect of the present invention, the present invention provides a power control method, including: obtaining a target control power of a power grid and a current power value of the power grid; determining a target power of an energy storage inverter based on the target control power and the current power value; obtaining the current operating power of the energy storage inverter; and determining the operating power of the energy storage component based on the target power and the current operating power.

[0013] The present invention proposes a power control method. By running the above power control method, the working power of the energy storage component can be controlled according to the target control power and current power value of the power grid. In this process, in the process of determining the working power of the energy storage component, it is necessary to use the target control power and current power value of the power grid to calculate the target power of the energy storage inverter, and then calculate the working power of the energy storage component according to the current operating power of the energy storage inverter and the calculated target power.

[0014] Compared with the method of directly using the energy conservation principle to calculate the working power of the energy storage component, the power control method proposed in the present invention determines the working power of the energy storage component according to the actual working conditions of the power grid, and can achieve accurate control of the power on the power grid, thereby improving the control accuracy of the power on the power grid.

[0015] In some technical solutions, optionally, the target control power of the power grid can be understood as the power that can be input or output at the grid port. Its specific value can be set by the user or by the default setting of the energy storage system where the energy storage inverter is located. Its specific value will not be repeated here.

[0016] In some technical solutions, if the target control power is greater than zero, it is considered that the grid supplies power to the energy storage inverter. Conversely, if the target control power is less than zero, it is considered that the energy storage inverter supplies power to the grid. When the energy storage inverter supplies power to the grid, it is considered that the energy storage inverter is currently selling electricity to the grid.

[0017] In some technical solutions, optionally, the current power value can be understood as the power value input or output at the connection point between the energy storage converter and the grid, that is, at the grid port during the actual operation of the energy storage converter.

[0018] In some technical solutions, the target power can be optionally understood as the inversion power that the energy storage inverter needs to achieve. When the energy storage inverter is working, the electric energy generated by the photovoltaic components can be inverted to supply power to the grid or to the load.

[0019] In some technical solutions, optionally, the energy storage component can be understood as a component that stores electrical energy, which can be a battery or a capacitor or other device that can store electrical energy.

[0020] Based on this, the working power of the energy storage component can also be understood as the charging power when the energy storage component is charged, or the discharging power when the energy storage component is discharged. The working power can be regarded as the charging power and the discharging power according to the actual working conditions of the energy storage component.

[0021] In addition, the power control method proposed in the present invention also has the following additional technical features.

[0022] In some technical schemes, optionally, the target power of the energy storage inverter is determined based on the target control power and the current power value, specifically including: determining a first power difference between the target control power and the current power value; inputting the first power difference into a first proportional-integral controller to obtain the target power determined by the first proportional-integral controller based on the first power difference.

[0023] In this technical solution, a first power difference is determined to determine power fluctuations from a power grid, and the first power difference is used as an input to a first proportional-integral controller, wherein the first proportional-integral controller performs a closed-loop control calculation upon receiving the first power difference to obtain a target power of the energy storage inverter.

[0024] Specifically, the first proportional integral controller applies proportional and integral control. Among them, PI control requires the use of calculation error, wherein the calculation error is also the first power difference in this application, which refers to the difference between the expected output and the actual output of the system.

[0025] In the process of proportional control, the error (i.e., the first power difference) is multiplied by the proportional gain to obtain a proportional control term, wherein the proportional control term makes the output of the first proportional-integral controller proportional to the error. The larger the error, the larger the output of the first proportional-integral controller, which means that the first proportional-integral controller regulates the system more actively.

[0026] For integral control, the error (ie, the first power difference) is multiplied by the integral gain, and the result is added to the previous integral accumulation to obtain an integral control term, which can eliminate the steady-state error so that the system achieves the desired output in steady state.

[0027] When the first proportional-integral controller performs PI control, the proportional control term and the integral control term are added together as the output of the first proportional-integral controller to obtain the target power.

[0028] In this process, when operating according to the target power output by the first proportional-integral controller, the current power value approaches the target control power, thereby reducing the power fluctuation at the grid port.

[0029] In some technical solutions, optionally, the power control method also includes: obtaining a first limiting power, where the first limiting power is the limiting power of the energy storage inverter; based on the target power being less than or equal to the first limiting power, keeping the target power unchanged; based on the target power being greater than the first limiting power, using the first limiting power as the updated target power.

[0030] In this technical solution, the first limited power is compared with the obtained target power to obtain the magnitude relationship between the two, and after knowing the magnitude relationship, the calculated target power is processed.

[0031] In this process, when the target power is greater than the first power limit, the target power is limited to not exceed the first power limit. Obviously, the energy storage inverter cannot operate in excess of the first power limit, so that the energy storage inverter can operate under relatively safe parameters, thereby improving the reliability of the energy storage inverter.

[0032] In some technical solutions, optionally, the working power of the energy storage component is determined based on the target power and the current operating power, specifically including: determining a second power difference between the target power and the current operating power; inputting the second power difference into a second proportional-integral controller to obtain the working power determined by the second proportional-integral controller based on the second power difference.

[0033] In this technical solution, the second power difference is determined in order to determine the power fluctuation from the energy storage inverter, and the second power difference is used as the input of the second proportional-integral controller, and is input into the second proportional-integral controller, wherein the second proportional-integral controller performs a closed-loop control calculation upon receiving the second power difference to obtain the working power of the energy storage component.

[0034] In this process, the energy storage component can be controlled to operate according to the working power output by the second proportional integral controller, so that the current power value of the power grid approaches the target control power, thereby reducing the power fluctuation at the grid port.

[0035] In some technical solutions, optionally, the power control method also includes: obtaining a second limiting power, which is the limiting power of the energy storage component; based on the working power being less than or equal to the second limiting power, keeping the working power unchanged; based on the working power being greater than the second limiting power, using the second limiting power as the updated working power.

[0036] In this technical solution, the second limited power is compared with the obtained working power to obtain the magnitude relationship between the two, and after knowing the magnitude relationship, the calculated working power is processed.

[0037] In this process, when the working power is greater than the second limiting power, the working power is limited to not exceed the second limiting power. Obviously, the energy storage component cannot operate in excess of the second limiting power. For the energy storage component, whether it is charging the energy storage component or controlling the discharge of the energy storage component, when its working power is limited, the heat generation power of the energy storage component during operation can be reduced. At the same time, the service life of the energy storage component can be extended, thereby improving the reliability of the energy storage component.

[0038] In some technical solutions, optionally, the operating power includes discharging power or charging power. When the current operating power is greater than the load power, the power control method further includes: reducing the discharging power or increasing the charging power.

[0039] In this technical solution, when the current operating power is greater than the load power, it can be understood that the energy storage inverter supplies power to the grid. At this time, the inverter power of the energy storage inverter exceeds the load power. Obviously, there is surplus electric energy generated by the photovoltaic component. By reducing the discharge power of the energy storage component, the output power of the energy storage component can be reduced. At this time, the surplus electric energy generated by the photovoltaic component can be utilized to make full use of green resources.

[0040] Similarly, without the need for energy storage components to output power, the surplus electricity generated by the photovoltaic components can be stored in the energy storage components by increasing the charging power. Obviously, in this process, full utilization of green resources can be achieved.

[0041] In the above technical solution, in the self-generation and self-use mode, the dependence of the energy storage converter on the power grid can be reduced while improving the utilization rate of green resources.

[0042] In some technical solutions, optionally, the operating power includes discharging power or charging power. When the current operating power is less than the load power, the power control method further includes: increasing the discharging power or reducing the charging power.

[0043] In this technical solution, if the current operating power is less than the load power, obviously, power is taken from the grid to supply power to the load. At this time, the distribution of generated power is not enough to meet the power demand of the load.

[0044] In order to meet the power requirements of the load, if the power generation power of the photovoltaic module is less than the load power, the discharge power can be increased so that the energy storage component can provide more electrical energy to the load, thereby reducing the dependence of the energy storage inverter on the power grid in the self-generation and self-use mode, while improving the utilization rate of green resources.

[0045] Similarly, if the power generation power of the photovoltaic module is greater than the load power, the surplus power of the photovoltaic module will be stored in the energy storage component. By reducing the charging power, more power can be allocated to the load, thereby meeting the power supply needs of the load.

[0046] In this process, in the self-generation and self-use mode, the energy storage inverter can reduce its dependence on the power grid while improving the utilization rate of green resources.

[0047] In some technical solutions, optionally, the value of the target control power is greater than or equal to zero.

[0048] According to a second aspect of the present invention, the present invention provides a power control device, comprising: a first acquisition unit, used to acquire a target control power of a power grid and a current power value of the power grid; a first determination unit, used to determine a target power of an energy storage inverter based on the target control power and the current power value; a second acquisition unit, used to acquire the current operating power of the energy storage inverter; and a second determination unit, used to determine the operating power of the energy storage component based on the target power and the current operating power.

[0049] The present invention proposes a power control device that can control the working power of an energy storage component according to the target control power and current power value of a power grid. In this process, in the process of determining the working power of the energy storage component, it is necessary to use the target control power and current power value of the power grid to calculate the target power of the energy storage inverter, and then calculate the working power of the energy storage component according to the current operating power of the energy storage inverter and the calculated target power.

[0050] Compared with the method of directly using the energy conservation principle to calculate the working power of the energy storage component, the power control method proposed in the present invention determines the working power of the energy storage component according to the actual working conditions of the power grid, and can achieve accurate control of the power on the power grid, thereby improving the control accuracy of the power on the power grid.

[0051] In some technical solutions, optionally, the target control power of the power grid can be understood as the power that can be input or output at the grid port. Its specific value can be set by the user or by the default setting of the energy storage system where the energy storage inverter is located. Its specific value will not be repeated here.

[0052] In some technical solutions, if the target control power is greater than zero, it is considered that the grid supplies power to the energy storage inverter. Conversely, if the target control power is less than zero, it is considered that the energy storage inverter supplies power to the grid. When the energy storage inverter supplies power to the grid, it is considered that the energy storage inverter is currently selling electricity to the grid.

[0053] In some technical solutions, optionally, the current power value can be understood as the power value input or output at the connection point between the energy storage converter and the grid, that is, at the grid port during the actual operation of the energy storage converter.

[0054] In some technical solutions, the target power can be optionally understood as the inversion power that the energy storage inverter needs to achieve. When the energy storage inverter is working, the electric energy generated by the photovoltaic components can be inverted to supply power to the grid or to the load.

[0055] In some technical solutions, optionally, the energy storage component can be understood as a component that stores electrical energy, which can be a battery or a capacitor or other device that can store electrical energy.

[0056] Based on this, the working power of the energy storage component can also be understood as the charging power when the energy storage component is charged, or the discharging power when the energy storage component is discharged. The working power can be regarded as the charging power and the discharging power according to the actual working conditions of the energy storage component.

[0057] In addition, the power control device proposed by the present invention also has the following additional technical features.

[0058] In some technical solutions, optionally, the first determination unit is specifically used to: determine a first power difference between the target control power and the current power value; input the first power difference to a first proportional-integral controller to obtain a target power determined by the first proportional-integral controller based on the first power difference.

[0059] In this technical solution, a first power difference is determined to determine power fluctuations from a power grid, and the first power difference is used as an input to a first proportional-integral controller, wherein the first proportional-integral controller performs a closed-loop control calculation upon receiving the first power difference to obtain a target power of the energy storage inverter.

[0060] Specifically, the first proportional integral controller applies proportional and integral control. Among them, PI control requires the use of calculation error, wherein the calculation error is also the first power difference in this application, which refers to the difference between the expected output and the actual output of the system.

[0061] In the process of proportional control, the error (i.e., the first power difference) is multiplied by the proportional gain to obtain a proportional control term, wherein the proportional control term makes the output of the first proportional-integral controller proportional to the error. The larger the error, the larger the output of the first proportional-integral controller, which means that the first proportional-integral controller regulates the system more actively.

[0062] For integral control, the error (ie, the first power difference) is multiplied by the integral gain, and the result is added to the previous integral accumulation to obtain an integral control term, which can eliminate the steady-state error so that the system achieves the desired output in steady state.

[0063] When the first proportional-integral controller performs PI control, the proportional control term and the integral control term are added together as the output of the first proportional-integral controller to obtain the target power.

[0064] In this process, when operating according to the target power output by the first proportional-integral controller, the current power value approaches the target control power, thereby reducing the power fluctuation at the grid port.

[0065] In some technical solutions, optionally, the first determination unit is also used to: obtain a first limiting power, where the first limiting power is the limiting power of the energy storage inverter; based on the target power being less than or equal to the first limiting power, keep the target power unchanged; based on the target power being greater than the first limiting power, use the first limiting power as the updated target power.

[0066] In this technical solution, the first limited power is compared with the obtained target power to obtain the magnitude relationship between the two, and after knowing the magnitude relationship, the calculated target power is processed.

[0067] In this process, when the target power is greater than the first power limit, the target power is limited to not exceed the first power limit. Obviously, the energy storage inverter cannot operate in excess of the first power limit, so that the energy storage inverter can operate under relatively safe parameters, thereby improving the reliability of the energy storage inverter.

[0068] In some technical solutions, optionally, the second determination unit is used to: determine a second power difference between the target power and the current operating power; input the second power difference to a second proportional-integral controller to obtain an operating power determined by the second proportional-integral controller based on the second power difference.

[0069] In this technical solution, the second power difference is determined in order to determine the power fluctuation from the energy storage inverter, and the second power difference is used as the input of the second proportional-integral controller, and is input into the second proportional-integral controller, wherein the second proportional-integral controller performs a closed-loop control calculation upon receiving the second power difference to obtain the working power of the energy storage component.

[0070] In this process, the energy storage component can be controlled to operate according to the working power output by the second proportional integral controller, so that the current power value of the power grid approaches the target control power, thereby reducing the power fluctuation at the grid port.

[0071] In some technical solutions, optionally, the second determination unit is also used to: obtain a second limiting power, where the second limiting power is the limiting power of the energy storage component; based on the working power being less than or equal to the second limiting power, keep the working power unchanged; based on the working power being greater than the second limiting power, use the second limiting power as the updated working power.

[0072] In this technical solution, the second limited power is compared with the obtained working power to obtain the magnitude relationship between the two, and after knowing the magnitude relationship, the calculated working power is processed.

[0073] In this process, when the working power is greater than the second limiting power, the working power is limited to not exceed the second limiting power. Obviously, the energy storage component cannot operate in excess of the second limiting power. For the energy storage component, whether it is charging the energy storage component or controlling the discharge of the energy storage component, when its working power is limited, the heat generation power of the energy storage component during operation can be reduced. At the same time, the service life of the energy storage component can be extended, thereby improving the reliability of the energy storage component.

[0074] In some technical solutions, optionally, the operating power includes discharging power or charging power, and the second determination unit is further used to: when the current operating power is greater than the load power, reduce the discharging power or increase the charging power.

[0075] In this technical solution, when the current operating power is greater than the load power, it can be understood that the energy storage inverter supplies power to the grid. At this time, the inverter power of the energy storage inverter exceeds the load power. Obviously, there is surplus electric energy generated by the photovoltaic component. By reducing the discharge power of the energy storage component, the output power of the energy storage component can be reduced. At this time, the surplus electric energy generated by the photovoltaic component can be utilized to make full use of green resources.

[0076] Similarly, without the need for energy storage components to output power, the surplus electricity generated by the photovoltaic components can be stored in the energy storage components by increasing the charging power. Obviously, in this process, full utilization of green resources can be achieved.

[0077] In the above technical solution, in the self-generation and self-use mode, the dependence of the energy storage converter on the power grid can be reduced while improving the utilization rate of green resources.

[0078] In some technical solutions, optionally, the operating power includes discharging power or charging power, and the second determination unit is further used to: increase the discharging power or reduce the charging power when the current operating power is less than the load power.

[0079] In this technical solution, if the current operating power is less than the load power, obviously, power is taken from the grid to supply power to the load. At this time, the distribution of generated power is not enough to meet the power demand of the load.

[0080] In order to meet the power requirements of the load, if the power generation power of the photovoltaic module is less than the load power, the discharge power can be increased so that the energy storage component can provide more electrical energy to the load, thereby reducing the dependence of the energy storage inverter on the power grid in the self-generation and self-use mode, while improving the utilization rate of green resources.

[0081] Similarly, if the power generation power of the photovoltaic module is greater than the load power, the surplus power of the photovoltaic module will be stored in the energy storage component. By reducing the charging power, more power can be allocated to the load, thereby meeting the power supply needs of the load.

[0082] In this process, in the self-generation and self-use mode, the energy storage inverter can reduce its dependence on the power grid while improving the utilization rate of green resources.

[0083] In some technical solutions, optionally, the value of the target control power is greater than or equal to zero.

[0084] According to the third aspect of the present invention, the present invention provides a power control device, including a processor and a memory, the memory storing programs or instructions that can be run on the processor, and when the programs or instructions are executed by the processor, the steps of any of the power control methods described above are implemented.

[0085] According to a fourth aspect of the present invention, the present invention provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of any of the power control methods described above are implemented.

[0086] According to a fifth aspect of the present invention, the present invention provides an energy storage converter, comprising: any power control device as described above; and / or a readable storage medium as described above.

[0087] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0089] Figure 1 A schematic diagram of a power control method according to an embodiment of the present invention is shown;

[0090] Figure 2 A schematic diagram of an energy system in a related technical solution is shown:

[0091] Figure 3 The schematic diagram of the power control method in the embodiment of the present invention is shown:

[0092] Figure 4 A schematic block diagram of a power control device in an embodiment of the present invention is shown;

[0093] Figure 5 A schematic block diagram of another power control device in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0094] In order to more clearly understand the above aspects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0095] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0096] In one embodiment of the present application, Figure 1 As shown, a power control method is provided, comprising:

[0097] Step 102, obtaining the target control power of the power grid and the current power value of the power grid;

[0098] Step 104, determining the target power of the energy storage converter based on the target control power and the current power value;

[0099] Step 106, obtaining the current operating power of the energy storage converter;

[0100] Step 108: determining the operating power of the energy storage component based on the target power and the current operating power.

[0101] The present invention proposes a power control method. By running the above power control method, the working power of the energy storage component can be controlled according to the target control power and current power value of the power grid. In this process, in the process of determining the working power of the energy storage component, it is necessary to use the target control power and current power value of the power grid to calculate the target power of the energy storage inverter, and then calculate the working power of the energy storage component according to the current operating power of the energy storage inverter and the calculated target power.

[0102] like Figure 2 As shown in the relevant technical solution, the controller in the energy storage converter in the energy storage system is connected to the power grid or programmable AC power supply, DC power supply or photovoltaic module, energy storage system and optional AC load. It uses the power difference of energy conservation to calculate the power difference, and the power control of the grid port is not accurate enough.

[0103] Compared with the method of directly using the energy conservation principle to calculate the working power of the energy storage component, the power control method proposed in the present invention determines the working power of the energy storage component according to the actual working conditions of the power grid, and can achieve accurate control of the power on the power grid, thereby improving the control accuracy of the power on the power grid.

[0104] In this embodiment, the power fluctuation at the power grid port can be controlled to a single digit, and will not change with different machines and environments.

[0105] In some embodiments, optionally, the target control power of the power grid can be understood as the power that can be input or output at the power grid port, and its specific value can be set by the user or by the default setting of the energy storage system where the energy storage inverter is located. Its specific value will not be repeated here.

[0106] In some embodiments, if the target control power is greater than zero, it is considered that the grid supplies power to the energy storage inverter. Conversely, if the target control power is less than zero, it is considered that the energy storage inverter supplies power to the grid. When the energy storage inverter supplies power to the grid, it is considered that the energy storage inverter is currently selling electricity to the grid.

[0107] In some embodiments, optionally, the current power value can be understood as the power value input or output at the connection point between the energy storage converter and the grid, that is, at the grid port during the actual operation of the energy storage converter.

[0108] In some embodiments, optionally, the target power can be understood as the inversion power that the energy storage inverter needs to achieve. When the energy storage inverter is working, the electric energy generated by the photovoltaic components can be inverted to supply power to the grid or to the load.

[0109] In some embodiments, optionally, the energy storage component can be understood as a component that stores electrical energy, which can be a battery, or a capacitor or other device that can store electrical energy.

[0110] Based on this, the working power of the energy storage component can also be understood as the charging power when the energy storage component is charged, or the discharging power when the energy storage component is discharged. The working power can be regarded as the charging power and the discharging power according to the actual working conditions of the energy storage component.

[0111] In some embodiments, optionally, the target power of the energy storage inverter is determined based on the target control power and the current power value, specifically including: determining a first power difference between the target control power and the current power value; inputting the first power difference into a first proportional-integral controller to obtain the target power determined by the first proportional-integral controller based on the first power difference.

[0112] In this embodiment, a first power difference is determined to determine power fluctuations from a power grid, and the first power difference is used as an input to a first proportional-integral controller, wherein the first proportional-integral controller performs a closed-loop control calculation upon receiving the first power difference to obtain a target power of the energy storage inverter.

[0113] Specifically, the first proportional integral controller applies proportional and integral control. Among them, PI control requires the use of calculation error, wherein the calculation error is also the first power difference in this application, which refers to the difference between the expected output and the actual output of the system.

[0114] In the process of proportional control, the error (i.e., the first power difference) is multiplied by the proportional gain to obtain a proportional control term, wherein the proportional control term makes the output of the first proportional-integral controller proportional to the error. The larger the error, the larger the output of the first proportional-integral controller, which means that the first proportional-integral controller regulates the system more actively.

[0115] For integral control, the error (ie, the first power difference) is multiplied by the integral gain, and the result is added to the previous integral accumulation to obtain an integral control term, which can eliminate the steady-state error so that the system achieves the desired output in steady state.

[0116] When the first proportional-integral controller performs PI control, the proportional control term and the integral control term are added together as the output of the first proportional-integral controller to obtain the target power.

[0117] In this process, when operating according to the target power output by the first proportional-integral controller, the current power value approaches the target control power, thereby reducing the power fluctuation at the grid port.

[0118] In some embodiments, optionally, the power control method also includes: obtaining a first limiting power, where the first limiting power is the limiting power of the energy storage converter; based on the target power being less than or equal to the first limiting power, keeping the target power unchanged; based on the target power being greater than the first limiting power, using the first limiting power as the updated target power.

[0119] In this embodiment, the first limit power is compared with the obtained target power to obtain the magnitude relationship between the two, and after knowing the magnitude relationship, the calculated target power is processed.

[0120] In this process, when the target power is greater than the first power limit, the target power is limited to not exceed the first power limit. Obviously, the energy storage inverter cannot operate in excess of the first power limit, so that the energy storage inverter can operate under relatively safe parameters, thereby improving the reliability of the energy storage inverter.

[0121] In some embodiments, optionally, the operating power of the energy storage component is determined based on the target power and the current operating power, specifically including: determining a second power difference between the target power and the current operating power; inputting the second power difference into a second proportional-integral controller to obtain the operating power determined by the second proportional-integral controller based on the second power difference.

[0122] In this embodiment, the second power difference is determined to determine the power fluctuation from the energy storage inverter, and the second power difference is used as an input to the second proportional-integral controller, wherein the second proportional-integral controller performs a closed-loop control calculation upon receiving the second power difference to obtain the working power of the energy storage component.

[0123] In this process, the energy storage component can be controlled to operate according to the working power output by the second proportional integral controller, so that the current power value of the power grid approaches the target control power, thereby reducing the power fluctuation at the grid port.

[0124] In some embodiments, optionally, the power control method also includes: obtaining a second limiting power, where the second limiting power is the limiting power of the energy storage component; based on the working power being less than or equal to the second limiting power, keeping the working power unchanged; based on the working power being greater than the second limiting power, using the second limiting power as the updated working power.

[0125] In this embodiment, the second limit power is compared with the obtained working power to obtain the magnitude relationship between the two, and after knowing the magnitude relationship, the calculated working power is processed.

[0126] In this process, when the working power is greater than the second limiting power, the working power is limited to not exceed the second limiting power. Obviously, the energy storage component cannot operate in excess of the second limiting power. For the energy storage component, whether it is charging the energy storage component or controlling the discharge of the energy storage component, when its working power is limited, the heat generation power of the energy storage component during operation can be reduced. At the same time, the service life of the energy storage component can be extended, thereby improving the reliability of the energy storage component.

[0127] In some embodiments, optionally, the operating power includes discharging power or charging power. When the current operating power is greater than the load power, the power control method further includes: reducing the discharging power or increasing the charging power.

[0128] In this embodiment, when the current operating power is greater than the load power, it can be understood that the energy storage inverter supplies power to the grid. At this time, the inverter power of the energy storage inverter exceeds the load power. Obviously, there is surplus electric energy generated by the photovoltaic component. By reducing the discharge power of the energy storage component, the output power of the energy storage component can be reduced. At this time, the surplus electric energy generated by the photovoltaic component can be utilized to make full use of green resources.

[0129] Similarly, without the need for energy storage components to output power, the surplus electricity generated by the photovoltaic components can be stored in the energy storage components by increasing the charging power. Obviously, in this process, full utilization of green resources can be achieved.

[0130] In the above embodiment, in the self-generation and self-use mode, the dependence of the energy storage converter on the power grid can be reduced while improving the utilization rate of green resources.

[0131] In some embodiments, optionally, the operating power includes discharging power or charging power. When the current operating power is less than the load power, the power control method further includes: increasing the discharging power or reducing the charging power.

[0132] In this embodiment, if the current operating power is less than the load power, obviously, power is taken from the grid to supply power to the load. At this time, the distribution of generated power is not enough to meet the power demand of the load.

[0133] In order to meet the power requirements of the load, if the power generation power of the photovoltaic module is less than the load power, the discharge power can be increased so that the energy storage component can provide more electrical energy to the load, thereby reducing the dependence of the energy storage inverter on the power grid in the self-generation and self-use mode, while improving the utilization rate of green resources.

[0134] Similarly, if the power generation power of the photovoltaic module is greater than the load power, the surplus power of the photovoltaic module will be stored in the energy storage component. By reducing the charging power, more power can be allocated to the load, thereby meeting the power supply needs of the load.

[0135] In this process, in the self-generation and self-use mode, the energy storage inverter can reduce its dependence on the power grid while improving the utilization rate of green resources.

[0136] In some embodiments, optionally, the value of the target control power is greater than or equal to zero.

[0137] In one embodiment, if Figure 3 As shown, the grid-side power difference Err (that is, the first power difference) is calculated according to the grid power control target (that is, the target control power in this application) and the current grid-side power (that is, the current power value in this application), and the PCS target power (that is, the target power in this application) is calculated based on the grid-side power difference Err, and the battery target power (that is, the working power in this application) is calculated according to the current PCS power (that is, the current operating power in this application) and the PCS target power.

[0138] Among them, the power conversion system (PCS) can control the charging and discharging process of the battery, perform AC / DC conversion, and directly supply power to AC loads when there is no power grid.

[0139] In one embodiment, Figure 4 As shown, the present invention provides a power control device 400, including: a first acquisition unit 402, used to acquire a target control power of a power grid and a current power value of the power grid; a first determination unit 404, used to determine a target power of an energy storage inverter based on the target control power and the current power value; a second acquisition unit 406, used to acquire the current operating power of the energy storage inverter; a second determination unit 408, used to determine the operating power of the energy storage component based on the target power and the current operating power.

[0140] The present invention proposes a power control device 400, which can control the working power of the energy storage component according to the target control power and current power value of the power grid. In this process, in the process of determining the working power of the energy storage component, it is necessary to use the target control power and current power value of the power grid to calculate the target power of the energy storage inverter, and then calculate the working power of the energy storage component according to the current operating power of the energy storage inverter and the calculated target power.

[0141] Compared with the method of directly using the energy conservation principle to calculate the working power of the energy storage component, the power control method proposed in the present invention determines the working power of the energy storage component according to the actual working conditions of the power grid, and can achieve accurate control of the power on the power grid, thereby improving the control accuracy of the power on the power grid.

[0142] In some embodiments, optionally, the target control power of the power grid can be understood as the power that can be input or output at the power grid port, and its specific value can be set by the user or by the default setting of the energy storage system where the energy storage inverter is located. Its specific value will not be repeated here.

[0143] In some embodiments, if the target control power is greater than zero, it is considered that the grid supplies power to the energy storage inverter. Conversely, if the target control power is less than zero, it is considered that the energy storage inverter supplies power to the grid. When the energy storage inverter supplies power to the grid, it is considered that the energy storage inverter is currently selling electricity to the grid.

[0144] In some embodiments, optionally, the current power value can be understood as the power value input or output at the connection point between the energy storage converter and the grid, that is, at the grid port during the actual operation of the energy storage converter.

[0145] In some embodiments, optionally, the target power can be understood as the inversion power that the energy storage inverter needs to achieve. When the energy storage inverter is working, the electric energy generated by the photovoltaic components can be inverted to supply power to the grid or to the load.

[0146] In some embodiments, optionally, the energy storage component can be understood as a component that stores electrical energy, which can be a battery, or a capacitor or other device that can store electrical energy.

[0147] Based on this, the working power of the energy storage component can also be understood as the charging power when the energy storage component is charged, or the discharging power when the energy storage component is discharged. The working power can be regarded as the charging power and the discharging power according to the actual working conditions of the energy storage component.

[0148] In addition, the power control device proposed by the present invention also has the following additional technical features.

[0149] In some embodiments, optionally, the first determination unit 404 is specifically used to: determine a first power difference between the target control power and the current power value; input the first power difference to a first proportional-integral controller to obtain a target power determined by the first proportional-integral controller based on the first power difference.

[0150] In this embodiment, a first power difference is determined to determine power fluctuations from a power grid, and the first power difference is used as an input to a first proportional-integral controller, wherein the first proportional-integral controller performs a closed-loop control calculation upon receiving the first power difference to obtain a target power of the energy storage inverter.

[0151] Specifically, the first proportional integral controller applies proportional and integral control. Among them, PI control requires the use of calculation error, wherein the calculation error is also the first power difference in this application, which refers to the difference between the expected output and the actual output of the system.

[0152] In the process of proportional control, the error (i.e., the first power difference) is multiplied by the proportional gain to obtain a proportional control term, wherein the proportional control term makes the output of the first proportional-integral controller proportional to the error. The larger the error, the larger the output of the first proportional-integral controller, which means that the first proportional-integral controller regulates the system more actively.

[0153] For integral control, the error (ie, the first power difference) is multiplied by the integral gain, and the result is added to the previous integral accumulation to obtain an integral control term, which can eliminate the steady-state error so that the system achieves the desired output in steady state.

[0154] When the first proportional-integral controller performs PI control, the proportional control term and the integral control term are added together as the output of the first proportional-integral controller to obtain the target power.

[0155] In this process, when operating according to the target power output by the first proportional-integral controller, the current power value approaches the target control power, thereby reducing the power fluctuation at the grid port.

[0156] In some embodiments, optionally, the first determination unit 404 is also used to: obtain a first limiting power, where the first limiting power is the limiting power of the energy storage converter; based on the target power being less than or equal to the first limiting power, keep the target power unchanged; based on the target power being greater than the first limiting power, use the first limiting power as the updated target power.

[0157] In this embodiment, the first limit power is compared with the obtained target power to obtain the magnitude relationship between the two, and after knowing the magnitude relationship, the calculated target power is processed.

[0158] In this process, when the target power is greater than the first power limit, the target power is limited to not exceed the first power limit. Obviously, the energy storage inverter cannot operate in excess of the first power limit, so that the energy storage inverter can operate under relatively safe parameters, thereby improving the reliability of the energy storage inverter.

[0159] In some embodiments, optionally, the second determination unit 408 is used to: determine a second power difference between the target power and the current operating power; input the second power difference to the second proportional-integral controller to obtain an operating power determined by the second proportional-integral controller based on the second power difference.

[0160] In this embodiment, the second power difference is determined to determine the power fluctuation from the energy storage inverter, and the second power difference is used as an input to the second proportional-integral controller, wherein the second proportional-integral controller performs a closed-loop control calculation upon receiving the second power difference to obtain the working power of the energy storage component.

[0161] In this process, the energy storage component can be controlled to operate according to the working power output by the second proportional integral controller, so that the current power value of the power grid approaches the target control power, thereby reducing the power fluctuation at the grid port.

[0162] In some embodiments, optionally, the second determination unit 408 is further used to: obtain a second limiting power, where the second limiting power is the limiting power of the energy storage component; based on the working power being less than or equal to the second limiting power, keep the working power unchanged; based on the working power being greater than the second limiting power, use the second limiting power as the updated working power.

[0163] In this embodiment, the second limit power is compared with the obtained working power to obtain the magnitude relationship between the two, and after knowing the magnitude relationship, the calculated working power is processed.

[0164] In this process, when the working power is greater than the second limiting power, the working power is limited to not exceed the second limiting power. Obviously, the energy storage component cannot operate in excess of the second limiting power. For the energy storage component, whether it is charging the energy storage component or controlling the discharge of the energy storage component, when its working power is limited, the heat generation power of the energy storage component during operation can be reduced. At the same time, the service life of the energy storage component can be extended, thereby improving the reliability of the energy storage component.

[0165] In some embodiments, optionally, the operating power includes discharging power or charging power, and the second determining unit 408 is further used to: when the current operating power is greater than the load power, reduce the discharging power or increase the charging power.

[0166] In this embodiment, when the current operating power is greater than the load power, it can be understood that the energy storage inverter supplies power to the grid. At this time, the inverter power of the energy storage inverter exceeds the load power. Obviously, there is surplus electric energy generated by the photovoltaic component. By reducing the discharge power of the energy storage component, the output power of the energy storage component can be reduced. At this time, the surplus electric energy generated by the photovoltaic component can be utilized to make full use of green resources.

[0167] Similarly, without the need for energy storage components to output power, the surplus electricity generated by the photovoltaic components can be stored in the energy storage components by increasing the charging power. Obviously, in this process, full utilization of green resources can be achieved.

[0168] In the above embodiment, in the self-generation and self-use mode, the dependence of the energy storage converter on the power grid can be reduced while improving the utilization rate of green resources.

[0169] In some embodiments, optionally, the operating power includes discharging power or charging power, and the second determining unit 408 is further used to: increase the discharging power or reduce the charging power when the current operating power is less than the load power.

[0170] In this embodiment, if the current operating power is less than the load power, obviously, power is taken from the grid to supply power to the load. At this time, the distribution of generated power is not enough to meet the power demand of the load.

[0171] In order to meet the power requirements of the load, if the power generation power of the photovoltaic module is less than the load power, the discharge power can be increased so that the energy storage component can provide more electrical energy to the load, thereby reducing the dependence of the energy storage inverter on the power grid in the self-generation and self-use mode, while improving the utilization rate of green resources.

[0172] Similarly, if the power generation power of the photovoltaic module is greater than the load power, the surplus power of the photovoltaic module will be stored in the energy storage component. By reducing the charging power, more power can be allocated to the load, thereby meeting the power supply needs of the load.

[0173] In this process, in the self-generation and self-use mode, the energy storage inverter can reduce its dependence on the power grid while improving the utilization rate of green resources.

[0174] In some embodiments, optionally, the value of the target control power is greater than or equal to zero.

[0175] In one embodiment, if Figure 5 As shown, the present invention provides another power control device 500, including a processor 502 and a memory 504, wherein the memory 504 stores programs or instructions that can be run on the processor 502, and when the programs or instructions are executed by the processor, the steps of any of the power control methods described above are implemented.

[0176] Among them, the memory 504 can be used to store software programs and various data. The memory 504 mainly includes a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area can store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 504 may include a volatile memory or a non-volatile memory, or the memory may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM) and a direct memory bus random access memory (DRRAM). The memory in the embodiments of the present application includes but is not limited to these and any other suitable types of memory.

[0177] In one embodiment, the present invention provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of any of the power control methods described above are implemented.

[0178] In one embodiment, the present invention provides an energy storage converter, comprising: any power control device as described above; and / or a readable storage medium as described above.

[0179] The term "first" or "second" in the specification and claims of the present application may include one or more of the features explicitly or implicitly. In the textual description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0180] In the text description of the present invention, it is understood that, except for explicit provisions and limitations, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be fixed connection, detachable connection, or integral connection; it can be mechanical structure connection or electrical connection; it can be direct connection between the two, or indirect connection between the two through an intermediate medium, or it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0181] In the claims, specification and drawings of the present invention, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like 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 invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do 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.

[0182] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power control method, characterized in that: include: Obtaining the target control power of the power grid and the current power value of the power grid; Determining a target power of the energy storage converter based on the target control power and the current power value; Obtaining the current operating power of the energy storage converter; The operating power of the energy storage component is determined based on the target power and the current operating power.

2. The power control method according to claim 1, characterized in that: The determining the target power of the energy storage converter based on the target control power and the current power value specifically includes: Determining a first power difference between the target control power and the current power value; The first power difference is input into a first proportional-integral controller to obtain a target power determined by the first proportional-integral controller based on the first power difference.

3. The power control method according to claim 2, characterized in that: The power control method further comprises: Acquire a first limited power, where the first limited power is a limited power of the energy storage converter; Based on the target power being less than or equal to the first limit power, maintaining the target power unchanged; Based on the fact that the target power is greater than the first limit power, the first limit power is used as the updated target power.

4. The power control method according to claim 1, characterized in that: The determining the operating power of the energy storage component based on the target power and the current operating power specifically includes: Determine a second power difference between the target power and the current operating power; The second power difference is input into a second proportional-integral controller to obtain a working power determined by the second proportional-integral controller based on the second power difference.

5. The power control method according to claim 4, characterized in that: The power control method further comprises: Acquire a second limited power, where the second limited power is a limited power of the energy storage component; Based on the operating power being less than or equal to the second limiting power, maintaining the operating power unchanged; Based on the fact that the operating power is greater than the second limited power, the second limited power is used as the updated operating power.

6. The power control method according to any one of claims 1 to 5, characterized in that: The working power includes discharging power or charging power. When the current operating power is greater than the load power, the power control method further includes: Reduce the discharging power or increase the charging power.

7. The power control method according to any one of claims 1 to 5, characterized in that: The working power includes discharging power or charging power. When the current operating power is less than the load power, the power control method further includes: Increase the discharging power or decrease the charging power.

8. The power control method according to any one of claims 1 to 5, characterized in that: The value of the target control power is greater than or equal to zero.

9. A power control device, characterized in that: include: A first acquisition unit, used for acquiring a target control power of the power grid and a current power value of the power grid; A first determining unit, configured to determine a target power of the energy storage converter based on the target control power and the current power value; A second acquisition unit, used to acquire the current operating power of the energy storage converter; The second determining unit is used to determine the operating power of the energy storage component based on the target power and the current operating power.

10. A power control device, characterized in that: The method comprises a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the power control method according to any one of claims 1 to 8 are implemented.

11. A readable storage medium, characterized in that: The readable storage medium stores a program or an instruction, and when the program or the instruction is executed by a processor, the steps of the power control method according to any one of claims 1 to 8 are implemented.

12. An energy storage converter, characterized in that: include: The power control device as claimed in claim 9 or 10; and / or The readable storage medium as claimed in claim 11.

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