Transformer area voltage regulation system

Abstract

The embodiment of the invention discloses a transformer area voltage regulation system. The system comprises an energy storage device, a bidirectional converter, a controller and a voltage sensor, the energy storage device is installed in a transformer area, the bidirectional converter is located between the energy storage device and a transformer area power grid of the transformer area, the bidirectional converter is connected with the energy storage device and the transformer area power grid, and the voltage sensor is installed in the transformer area power grid. The controller is in communication connection with the energy storage device, the bidirectional converter and the voltage sensor, and the voltage sensor is used for monitoring the transformer area voltage of the transformer area power grid and sending the monitored transformer area voltage value to the controller; and the controller is used for controlling the district power grid to charge the energy storage device through the bidirectional converter or controlling the energy storage device to supply power to the district power grid through the bidirectional converter based on the received district voltage value. According to the technical scheme provided by the embodiment of the invention, the voltage stability of the transformer area can be ensured.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of power transmission, and in particular to a substation voltage regulation system. Background Art

[0002] In recent years, with the vigorous promotion of renewable energy, photovoltaic power generation has been widely used in power supply in substations.

[0003] However, the intermittent and random nature of photovoltaic power generation will lead to increased fluctuations in the voltage in the substation. It should be emphasized that excessively high substation voltage will damage the electrical equipment in the substation, while too low substation voltage will affect the normal operation of the electrical equipment in the substation.

[0004] Therefore, how to ensure the stability of the voltage in the substation is crucial. Summary of the invention

[0005] The embodiment of the present invention provides a substation voltage regulation system to ensure the stability of substation voltage.

[0006] According to one aspect of the present invention, a substation voltage regulation system is provided, which may include: an energy storage device, a bidirectional converter, a controller and a voltage sensor, wherein the energy storage device is installed in the substation, the bidirectional converter is located between the energy storage device and the substation power grid of the substation, the bidirectional converter is connected to the energy storage device and the substation power grid respectively, the voltage sensor is installed in the substation power grid, and the controller is connected to the energy storage device, the bidirectional converter and the voltage sensor for communication; wherein,

[0007] The voltage sensor is used to monitor the voltage of the power grid in the substation area and send the monitored voltage value to the controller;

[0008] The controller is used to control the substation grid to charge the energy storage device through the bidirectional converter based on the received substation voltage value, or control the energy storage device to supply power to the substation grid through the bidirectional converter.

[0009] The technical solution of the embodiment of the present invention includes: an energy storage device, a bidirectional converter, a controller and a voltage sensor, wherein the energy storage device is installed in the substation, the bidirectional converter is located between the energy storage device and the substation power grid of the substation, the bidirectional converter is connected to the energy storage device and the substation power grid respectively, the voltage sensor is installed in the substation power grid, and the controller is respectively connected to the energy storage device, the bidirectional converter and the voltage sensor, wherein the voltage sensor is used to monitor the substation voltage of the substation power grid, and send the monitored substation voltage value to the controller to monitor the substation voltage in real time to ensure that the substation voltage can be adjusted in time later; the controller is used to control the substation power grid to charge the energy storage device through the bidirectional converter based on the received substation voltage value, or control the energy storage device to supply power to the substation power grid through the bidirectional converter, and the controller can reasonably control the charging and power supply behavior of the energy storage device and accurately adjust the substation voltage. The above technical solution can ensure the stability of the substation voltage by controlling the charging and power supply behavior of the energy storage device through the controller based on the monitored substation voltage.

[0010] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 is a structural block diagram of a substation voltage regulation system provided according to an embodiment of the present invention;

[0013] Figure 2 is a structural block diagram of another substation voltage regulation system provided according to an embodiment of the present invention;

[0014] Figure 3 It is a device circuit diagram of a substation voltage regulation system which is a specific example of another substation voltage regulation system provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0016] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. The situations of "target", "original", etc. are similar and will not be repeated here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0017] Figure 1 1 is a structural block diagram of a substation voltage regulation system provided by an embodiment of the present invention. This embodiment is applicable to the case of regulating substation voltage.

[0018] See also Figure 1 The substation voltage regulation system of the embodiment of the present invention includes: an energy storage device 11, a bidirectional converter 12, a controller 13 and a voltage sensor 14, wherein the energy storage device 11 is installed in the substation, the bidirectional converter 12 is located between the energy storage device 11 and the substation power grid of the substation, the bidirectional converter 12 is connected to the energy storage device 11 and the substation power grid respectively, the voltage sensor 14 is installed in the substation power grid, and the controller 13 is respectively connected to the energy storage device 11, the bidirectional converter 12 and the voltage sensor 14 in communication; wherein,

[0019] The voltage sensor 14 is used to monitor the substation voltage of the substation power grid and send the monitored substation voltage value to the controller 13;

[0020] The controller 13 is used to control the substation grid to charge the energy storage device 11 through the bidirectional converter 12 or control the energy storage device 11 to supply power to the substation grid through the bidirectional converter 12 based on the received substation voltage value.

[0021] The energy storage device 11 can be understood as a device for storing electric energy, which can store and release electric energy to the power grid of the substation, such as a battery pack, etc. Optionally, the energy storage device 11 is installed at a preset installation location based on safety specifications and standards to improve safety.

[0022] The bidirectional converter 12 can be understood as a power electronic device that can realize bidirectional energy conversion between AC and DC. The bidirectional converter 12 can be used to convert the AC in the substation grid into DC to charge the energy storage device 11, and convert the DC in the energy storage device 11 into AC to supply power to the substation grid, thereby realizing the mutual flow of electric energy between the substation grid and the energy storage device 11.

[0023] The voltage sensor 14 can be understood as a sensor for monitoring the substation voltage of the substation power grid. The voltage sensor 14 can be installed at key nodes of the substation power grid to ensure accurate monitoring of the substation voltage.

[0024] The controller 13 can be understood as a device for controlling the charging and power supply of the energy storage device 11. The controller 13 can determine the charging or power supply operation of the energy storage device 11 based on the received station voltage value, and control the energy storage device 11 to charge or power supply based on the bidirectional converter 12.

[0025] The voltage sensor 14 is installed in the substation power grid to monitor the substation voltage of the substation power grid, and the monitored substation voltage value is sent to the controller 13. The controller 13 controls the substation power grid to charge the energy storage device 11 through the bidirectional converter 12 according to the received substation voltage value, or controls the energy storage device 11 to supply power to the substation power grid through the bidirectional converter 12 to maintain the stability of the substation voltage.

[0026] The technical solution of the embodiment of the present invention includes: an energy storage device, a bidirectional converter, a controller and a voltage sensor, wherein the energy storage device is installed in the substation, the bidirectional converter is located between the energy storage device and the substation power grid of the substation, the bidirectional converter is connected to the energy storage device and the substation power grid respectively, the voltage sensor is installed in the substation power grid, and the controller is respectively connected to the energy storage device, the bidirectional converter and the voltage sensor, wherein the voltage sensor is used to monitor the substation voltage of the substation power grid, and send the monitored substation voltage value to the controller to monitor the substation voltage in real time to ensure that the substation voltage can be adjusted in time later; the controller is used to control the substation power grid to charge the energy storage device through the bidirectional converter based on the received substation voltage value, or control the energy storage device to supply power to the substation power grid through the bidirectional converter, and the controller can reasonably control the charging and power supply behavior of the energy storage device and accurately adjust the substation voltage. The above technical solution can ensure the stability of the substation voltage by controlling the charging and power supply behavior of the energy storage device through the controller based on the monitored substation voltage.

[0027] An optional technical solution, the energy storage device includes: an energy storage battery, a charge state determination module, a charging stop module and a power supply stop module: the energy storage battery is used to store electric energy; the charge state determination module is used to determine the charge state of the energy storage battery based on the change of electric energy in the energy storage battery; the charging stop module is used to stop charging the energy storage battery when the charge state is greater than or equal to a preset maximum charge value; the power supply stop module is used to stop supplying power to the energy storage battery when the charge state is less than or equal to a preset minimum charge value.

[0028] The energy storage battery can be understood as a chemical battery that stores electrical energy and can convert electrical energy into chemical energy. Optionally, there can be multiple energy storage batteries to increase the storage capacity of electrical energy.

[0029] The state of charge determination module can be understood as a module that determines the state of charge of the energy storage battery based on the change of the electric energy in the energy storage battery, for example, determining that the state of charge of the energy storage battery is 70%, etc. The energy storage situation inside the energy storage battery can be determined by the state of charge. Optionally, the ampere-hour integration method can be used to calculate the state of charge by accumulating the integral of the current of the energy storage battery.

[0030] The preset maximum charge value can be understood as the preset maximum charge value of the energy storage battery. When it exceeds the preset maximum charge value, the energy storage battery is too saturated, affecting the life and performance of the energy storage battery. The preset minimum charge value can be understood as the preset minimum charge value of the energy storage battery. When it is lower than the preset minimum charge value, the energy storage battery will be too low, affecting the life and performance of the energy storage battery.

[0031] The state of charge determination module determines the state of charge of the energy storage battery based on the change of electric energy in the energy storage battery. When the state of charge is greater than or equal to the preset maximum charge value, the charging stop module stops charging the energy storage battery. When the state of charge is less than or equal to the preset minimum charge value, the power supply stop module stops supplying power to the energy storage battery.

[0032] The above technical solution can ensure that the state of charge of the energy storage battery will not be too high or too low, thereby extending the service life of the energy storage battery.

[0033] On this basis, optionally, there are multiple energy storage batteries, and the energy storage device further includes: a charge balancing module, which is used to balance the charge states corresponding to the multiple energy storage batteries based on a preset cycle.

[0034] Among them, there may be multiple data of energy storage batteries. When charging or supplying power, the charge states of multiple energy storage batteries may be different due to differences in battery model and position. In order to ensure that the charge states of each energy storage battery are consistent and improve the overall performance and service life of the energy storage device, a charge equalization module may be used to adopt passive equalization or active equalization technology to equalize the charge states corresponding to the multiple energy storage batteries based on a preset period, such as one week.

[0035] The above technical solution can improve the overall performance and service life of the energy storage device by balancing the charge states of multiple energy storage batteries.

[0036] Another optional technical solution is that the substation voltage regulation system also includes a timer, which is communicated with the energy storage device and the bidirectional converter respectively; the timer is used to control the substation power grid to charge the energy storage device through the bidirectional converter based on a preset charging time period; the timer is also used to control the energy storage device to supply power to the substation power grid through the bidirectional converter based on a preset power supply time period.

[0037] Among them, the timer can be understood as a device that is respectively connected to the energy storage device and the bidirectional converter in communication, and can charge or supply power to the energy storage device at a fixed time. Since the user's power consumption and the photovoltaic power generation in the substation grid are both periodic, for example, the power consumption is high in the evening, while the photovoltaic power generation is low. Therefore, in the evening time period, such as 18:00-22:00, the timer can be set to set the energy storage device bidirectional converter to supply power to the substation grid; in the afternoon, the photovoltaic power generation is high, while the power consumption is low. Therefore, in the afternoon time period, such as 13:00-16:00, the timer can be set to set the substation grid to charge the energy storage device through the bidirectional converter.

[0038] The above technical solution can set a specific charging time period and power supply time period through a timer.

[0039] Another optional technical solution is that the substation voltage regulation system also includes a communication module, wherein the communication module is respectively connected to the voltage sensor and the energy storage device for communication; the communication module is used to send the substation voltage value and the status data of the energy storage device to the remote monitoring terminal that manages the substation power grid.

[0040] The status data may be understood as data reflecting the operating status of the energy storage device, such as the charge status of the energy storage battery in the energy storage device and fault information of the energy storage device.

[0041] The communication module can be understood as a module that is connected to the voltage sensor and the energy storage device for communication, and can obtain the voltage value and status data of the substation area, and send the voltage value and status data of the substation area to the remote monitoring terminal that manages the power grid of the substation area. The voltage value and status data of the substation area can be obtained through the communication module and sent to the remote monitoring terminal.

[0042] The above technical solution can realize remote monitoring and management of energy storage devices and substation voltages through the communication module, reducing operation and maintenance costs and improving operation and maintenance efficiency.

[0043] Figure 2 It is a structural block diagram of another substation voltage regulation system provided by an embodiment of the present invention. This embodiment is optimized based on the above-mentioned technical solutions. In this embodiment, optionally, the controller includes: a charging control module and a power supply control module; wherein the charging control module is used to control the substation power grid to charge the energy storage device through a bidirectional converter when the substation voltage value is greater than or equal to the preset maximum voltage; the power supply control module is used to control the energy storage device to supply power to the substation power grid through a bidirectional converter when the substation voltage value is less than or equal to the preset minimum voltage. Among them, the explanations of the terms that are the same or corresponding to the above-mentioned embodiments are not repeated here.

[0044] For details, see Figure 2 The substation voltage regulation system of this embodiment includes: an energy storage device 21, a bidirectional converter 22, a controller 23 and a voltage sensor 24, wherein the energy storage device 21 is installed in the substation, the bidirectional converter 22 is located between the energy storage device 21 and the substation power grid of the substation, the bidirectional converter 22 is connected to the energy storage device 21 and the substation power grid respectively, the voltage sensor 24 is installed in the substation power grid, the controller 23 is respectively connected to the energy storage device 21, the bidirectional converter 22 and the voltage sensor 24 in communication, and the controller 23 includes a charging control module 231 and a power supply control module 232; wherein,

[0045] The voltage sensor 24 is used to monitor the substation voltage of the substation power grid and send the monitored substation voltage value to the controller 23;

[0046] The charging control module 231 is used to control the power grid in the control area to charge the energy storage device 21 through the bidirectional converter 22 when the voltage value in the area is greater than or equal to the preset maximum voltage;

[0047] The power supply control module 232 is used to control the energy storage device 21 to supply power to the power grid in the substation through the bidirectional converter 22 when the substation voltage value is less than or equal to the preset minimum voltage value.

[0048] Among them, the charging control module 231 can be understood as a module that controls the station area power grid to charge the energy storage device 21 through the bidirectional converter 22. When the station area voltage value is greater than or equal to the preset maximum voltage, the station area power grid can charge the energy storage device 21 through the bidirectional converter 22 with a certain charging power to reduce the station area voltage of the station area power grid.

[0049] The power supply control module 232 can be understood as a module that controls the energy storage device 21 to supply power to the substation power grid through the bidirectional converter 22. When the substation voltage value is less than or equal to the preset minimum voltage value, the energy storage device 21 can be controlled to supply power to the substation power grid through the bidirectional converter 22 to increase the substation voltage of the substation power grid.

[0050] The above technical solution can realize accurate control of charging and power supply by setting different control modules.

[0051] An optional technical solution, the charging control module includes: a target charging power calculation submodule and a charging control submodule; wherein the target charging power calculation submodule is used to calculate the target charging power based on the substation voltage value, the preset maximum voltage and the rated charging power of the energy storage device when the substation voltage value is greater than or equal to the preset maximum voltage; the charging control submodule is used to control the substation power grid to charge the energy storage device through a bidirectional converter based on the target charging power.

[0052] Among them, the target charging power calculation submodule can be understood as a module that calculates the charging power when the energy storage device is charged. Optionally, when the station voltage value is greater than or equal to the preset voltage maximum value, the target charging power calculation submodule can be used to calculate the target charging power based on the station voltage value, the preset voltage maximum value and the rated charging power of the energy storage device. Optionally, on the basis of not exceeding the rated charging power, the greater the difference between the station voltage value and the preset voltage maximum value, the greater the calculated target charging power, so as to quickly reduce the station voltage.

[0053] After the target charging power is calculated, the charging control submodule can control the control area power grid to charge the energy storage device through the bidirectional converter based on the target charging power.

[0054] The above technical solution charges the energy storage device based on the target charging power, which can better reduce the station voltage.

[0055] On this basis, optionally, a charging power calculation submodule is specifically used to: when the substation voltage value is greater than a preset maximum voltage value, calculate a first voltage difference between the substation voltage value and the preset maximum voltage value; multiply the first voltage difference by a preset first adjustment coefficient to obtain a first product result; multiply the first product result by the rated charging power of the energy storage device to obtain a target charging power.

[0056] Among them, the target charging power can be calculated by the following formula:

[0057] Pcharge=k*(Vactual-Vmax)*Prated

[0058] Among them, Pcharge is the target charging power, k is the adjustment coefficient (which can be adjusted and determined according to actual conditions), Vactual is the station voltage, Prated is the rated charging power of the energy storage device, and Vmax is the preset maximum voltage.

[0059] The above technical solution can calculate the target charging power in real time according to the station voltage.

[0060] Another optional technical solution, the power supply control module includes: a target power supply power calculation submodule and a power supply control submodule; wherein the target power supply power calculation submodule is used to calculate the target power supply power based on the substation voltage value, the preset minimum voltage value and the rated power supply power of the energy storage device when the substation voltage value is less than or equal to the preset minimum voltage value; the power supply control submodule is used to control the energy storage device to supply power to the substation power grid through a bidirectional converter based on the target power supply power.

[0061] Among them, the target power supply power calculation submodule can be understood as a module that calculates the power supply power when the energy storage device supplies power to the substation power grid. Optionally, when the substation voltage value is less than or equal to the preset minimum voltage value, the target power supply power can be calculated by the target power supply power calculation submodule based on the substation voltage value, the preset minimum voltage value and the rated power supply power of the energy storage device. Optionally, on the basis of not exceeding the rated power supply, the greater the difference between the preset maximum voltage and the substation voltage value, the greater the calculated target power supply power, thereby quickly increasing the substation voltage.

[0062] After the target power supply power is calculated, the power supply control submodule can control the energy storage device to supply power to the substation grid through the bidirectional converter based on the target power supply power.

[0063] The above technical solution, based on the target power supply power, uses the energy storage device to supply power to the substation grid, which can better improve the substation voltage.

[0064] On this basis, optionally, the target power supply power calculation submodule is specifically used to: when the substation voltage value is less than the preset minimum voltage value, calculate the second voltage difference between the preset minimum voltage value and the substation voltage value; multiply the second voltage difference by the preset second adjustment coefficient to obtain a second product result; multiply the product result by the rated power supply power of the energy storage device to obtain the target power supply power.

[0065] The target power supply can be calculated by the following formula:

[0066] Pdischarge=k'*(Vmin-Vactual)*Prated'

[0067] Among them, Pdischarge is the target power supply, k' is the adjustment coefficient, Vactual is the station voltage, Vmin is the preset minimum voltage, and Prated' is the rated power supply of the energy storage device.

[0068] The above technical solution can calculate the target power supply power in real time according to the substation voltage.

[0069] In order to better understand the above-mentioned technical solutions as a whole, the following is an exemplary description of them in combination with specific examples. Figure 3 This is the device circuit diagram of the area voltage regulation system. The specific steps are as follows:

[0070] Step 1: Installation of the voltage regulation system in the substation

[0071] 1. Hardware Installation

[0072] Select a suitable location in the substation to install equipment such as energy storage batteries, bidirectional converters and controllers, and ensure that the installation of the equipment complies with relevant safety regulations and standards.

[0073] Install voltage sensors at key nodes in the substation to ensure accurate monitoring of the substation voltage.

[0074] Connect the communication module to ensure smooth communication with external systems and set timers.

[0075] 2. Software Configuration

[0076] According to the actual situation of the substation, set the parameters of the controller, including the preset maximum voltage (Vmax), the preset minimum voltage (Vmin), the rated charging power and the rated supply power, etc.

[0077] Install remote monitoring and management software, and configure related parameters, such as communication protocol and data collection frequency.

[0078] Step 2: Monitoring and judging the voltage in the substation area

[0079] 1. Use voltage sensors to monitor the substation voltage in real time at a certain sampling frequency (e.g. 10 times per second).

[0080] 2. Voltage judgment: Compare the real-time collected substation voltage value with Vmax and Vmin. If the voltage is higher than Vmax, the substation voltage is judged to be too high; if the voltage is lower than Vmin, the substation voltage is judged to be too low.

[0081] Step 3: Charging control and power supply control of energy storage device

[0082] 1. Charging control

[0083] When the station area voltage is higher than Vmax and the state of charge (SOC) of the energy storage device has not reached the upper limit value SOCmax, the control station area power grid charges the energy storage device through the bidirectional converter with the calculated target charging power.

[0084] 2. Power supply control

[0085] When the substation voltage is lower than Vmin and the SOC of the energy storage device is greater than the lower limit SOCmin, the energy storage device is controlled to supply power to the substation grid through the bidirectional converter with the calculated target power supply.

[0086] Step 4: End Condition

[0087] 1. The low-voltage substation energy storage device management system (i.e., substation voltage regulation system) is instructed to stop operating.

[0088] 2. If an abnormal situation occurs, such as voltage sensor failure, energy storage device failure, etc., which causes the low-voltage area energy storage device management system to fail to operate normally, an alarm should be issued in time and corresponding fault handling measures should be taken.

[0089] The above specific examples can ensure the stability of the voltage in the substation area.

[0090] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A substation voltage regulation system, characterized in that: include: An energy storage device, a bidirectional converter, a controller and a voltage sensor, wherein the energy storage device is installed in a substation, the bidirectional converter is located between the energy storage device and the substation power grid of the substation, the bidirectional converter is connected to the energy storage device and the substation power grid respectively, the voltage sensor is installed in the substation power grid, and the controller is connected to the energy storage device, the bidirectional converter and the voltage sensor for communication respectively; wherein, The voltage sensor is used to monitor the area voltage of the area power grid and send the monitored area voltage value to the controller; The controller is used to control the substation grid to charge the energy storage device through the bidirectional converter, or control the energy storage device to supply power to the substation grid through the bidirectional converter based on the received substation voltage value.

2. The system according to claim 1, characterized in that The controller includes: a charging control module and a power supply control module; wherein, The charging control module is used to control the grid in the substation to charge the energy storage device through the bidirectional converter when the voltage value in the substation is greater than or equal to the preset maximum voltage; The power supply control module is used to control the energy storage device to supply power to the substation power grid through the bidirectional converter when the substation voltage value is less than or equal to a preset minimum voltage value.

3. The system according to claim 2, characterized in that The charging control module includes: a target charging power calculation submodule and a charging control submodule; wherein, The target charging power calculation submodule is used to calculate the target charging power based on the station voltage value, the preset voltage maximum value and the rated charging power of the energy storage device when the station voltage value is greater than or equal to the preset voltage maximum value; The charging control submodule is used to control the substation power grid to charge the energy storage device through the bidirectional converter based on the target charging power.

4. The system according to claim 3, characterized in that The target charging power calculation submodule is specifically used for: When the station voltage value is greater than a preset maximum voltage value, calculating a first voltage difference between the station voltage value and the preset maximum voltage value; Multiplying the first voltage difference by a preset first adjustment coefficient to obtain a first product result; The first product result is multiplied by the rated charging power of the energy storage device to obtain a target charging power.

5. The system according to claim 2, characterized in that The power supply control module includes: a target power supply calculation submodule and a power supply control submodule; wherein, The target power supply calculation submodule is used to calculate the target power supply based on the station voltage value, the preset voltage minimum value and the rated power supply of the energy storage device when the station voltage value is less than or equal to the preset voltage minimum value; The power supply control submodule is used to control the energy storage device to supply power to the substation area power grid through the bidirectional converter based on the target power supply power.

6. The system according to claim 5, characterized in that The target power supply calculation submodule is specifically used for: When the station voltage value is less than a preset minimum voltage value, calculating a second voltage difference between the preset minimum voltage value and the station voltage value; Multiplying the second voltage difference by a preset second adjustment coefficient to obtain a second product result; The product result is multiplied by the rated power supply power of the energy storage device to obtain the target power supply power.

7. The system according to claim 1, characterized in that The energy storage device includes: an energy storage battery, a state of charge determination module, a charging stop module and a power supply stop module: The energy storage battery is used to store electrical energy; The state of charge determination module is used to determine the state of charge of the energy storage battery based on the change of the electric energy in the energy storage battery; The charging stop module is used to stop charging the energy storage battery when the state of charge is greater than or equal to a preset maximum charge value; The power supply stopping module is used to stop the power supply of the energy storage battery when the charge state is less than or equal to a preset minimum charge value.

8. The system according to claim 7, characterized in that The energy storage battery is multiple, and the energy storage device further includes: The charge equalization module is used to equalize the charge states corresponding to the plurality of energy storage batteries based on a preset period.

9. The system according to claim 1, characterized in that Also includes a timer, wherein the timer is communicatively connected to the energy storage device and the bidirectional converter respectively; The timer is used to control the substation power grid to charge the energy storage device through the bidirectional converter based on a preset charging time period; The timer is also used to control the energy storage device to supply power to the substation power grid through the bidirectional converter based on a preset power supply time period.

10. The system according to claim 1, characterized in that Also includes a communication module, wherein the communication module is communicatively connected with the voltage sensor and the energy storage device respectively; The communication module is used to send the substation voltage value and the status data of the energy storage device to a remote monitoring terminal that manages the substation power grid.

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