Voltage regulation method and system for power distribution area, electronic device and storage medium

Abstract

The application provides a voltage regulation method and system for a power distribution area, electronic equipment and a storage medium. The voltage regulation method for the power distribution area comprises the following steps: obtaining a detection value of three-phase voltage of a power grid of the power distribution area and a first time; matching the detection value of the three-phase voltage with a first voltage range; when the detection value of the three-phase voltage does not match the first voltage range, controlling charging and discharging of an energy storage device connected with the power grid of the power distribution area according to the detection value of the three-phase voltage, a maximum voltage value in the first voltage range and a minimum voltage value in the first voltage range; and when the detection value of the three-phase voltage matches the first voltage range, controlling charging and discharging of the energy storage device according to the first time and a remaining power amount of the energy storage device. According to the relationship between the detection value of the three-phase voltage and the voltage range, the energy storage device is controlled to perform different work, so that automatic management of three-phase voltage of the power distribution area is realized without transformer expansion or line reconstruction, and manual monitoring and intervention are not needed.

Description

Technical Field

[0001] This invention relates to the field of power system distribution network technology, and more specifically, to a voltage regulation method and system, electronic equipment and storage medium for a distribution substation. Background Technology

[0002] With the advancement of new urbanization, electricity demand in rural areas has experienced explosive growth, posing a severe challenge to the power supply systems of transformer substations. During peak load periods, especially during the summer when air conditioning is used intensively, the voltage at the end of some substations is significantly lower than the standard value, causing problems such as household appliances failing to start and lighting flickering, directly impacting residents' quality of life. This phenomenon stems from the inherent characteristics of the substation power supply network: transformer capacity and line design are usually based on historical load forecasts, making it difficult to adapt to the intermittent access of modern distributed energy sources (such as photovoltaic power generation) and rapid load fluctuations. Traditional solutions, such as transformer expansion or line upgrades, can alleviate the problem locally, but they suffer from drawbacks such as high cost, long development cycles, and poor adaptability, failing to dynamically respond to load changes. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] Therefore, the first aspect of the present invention proposes a voltage regulation method for a distribution radio station area.

[0005] A second aspect of the invention provides a voltage regulation system for a distribution radio station.

[0006] A third aspect of the present invention provides an electronic device.

[0007] A fourth aspect of the present invention provides a storage medium.

[0008] In view of this, according to a first aspect of the present invention, a voltage regulation method for a distribution substation is proposed, comprising: acquiring the detected values ​​of the three-phase voltages of the substation power grid and a first time; matching the detected values ​​of the three-phase voltages with a first voltage range; when the detected values ​​of the three-phase voltages do not match the first voltage range, controlling the charging and discharging of an energy storage device connected to the substation power grid according to the detected values ​​of the three-phase voltages, the maximum voltage value in the first voltage range, and the minimum voltage value in the first voltage range; and when the detected values ​​of the three-phase voltages match the first voltage range, controlling the charging and discharging of the energy storage device according to the first time and the remaining power of the energy storage device.

[0009] The voltage regulation method for a distribution substation provided by this invention mainly includes: firstly, acquiring the detected values ​​of the three-phase voltage of the substation power grid and a first time, where the first time refers to the current time. Then, matching the detected values ​​of the three-phase voltage with a first voltage range, where the first voltage range is determined by the voltage values ​​of the three-phase voltage when the substation power grid is operating normally. When the detected values ​​of the three-phase voltage do not match the first voltage range, i.e., when the detected values ​​of the three-phase voltage are not within the first voltage range, it indicates that the three-phase voltage of the substation power grid is abnormal. Then, based on the detected values ​​of the three-phase voltage, the maximum voltage value in the first voltage range, and the minimum voltage value in the first voltage range, the charging and discharging of the energy storage device connected to the substation power grid is controlled. Specifically, when the three-phase voltage is abnormal, the detected values ​​of the three-phase voltage are compared with the maximum and minimum voltage values ​​in the first voltage range to determine the abnormal information of the three-phase voltage, and then the charging or discharging of the energy storage device connected to the substation power grid is controlled based on the abnormal information of the three-phase voltage. When the detected three-phase voltage values ​​match the first voltage range, indicating that the three-phase voltage is normal, the energy storage device is controlled to charge or discharge based on the first time and the remaining power of the energy storage device. It is understandable that due to user habits and distributed photovoltaic (PV) integration, low or high grid voltage situations may occur at certain times of the day. Therefore, it is necessary to control the energy storage device to pre-discharge or charge before these specific time periods to ensure sufficient power to handle low or high grid voltage situations. Thus, when the three-phase voltage is within the first voltage range, the energy storage device is controlled to charge or discharge based on the current time and the remaining power of the energy storage device. This invention, by controlling the energy storage device to perform different operations based on the relationship between the detected three-phase voltage values, the maximum voltage value, and the minimum voltage value when the three-phase voltage is in an abnormal state, achieves automatic management of the three-phase voltage in the distribution area without the need for transformer expansion or line modification, and without manual monitoring and intervention. Meanwhile, this invention ensures that the energy storage device has sufficient energy to handle situations where the grid voltage is low or high by controlling the energy storage device to perform different tasks according to the current first time when the three-phase voltage is normal.

[0010] In some technical solutions, optionally, the step of matching the detected values ​​of the three-phase voltage with the first voltage range includes: determining the voltage detection value of each phase of the three-phase voltage based on the detected values ​​of the three-phase voltage; matching the voltage detection value of each phase of the three-phase voltage with the first voltage range respectively; determining that the three-phase voltage does not match the first voltage range when the voltage detection value of any one phase of the three-phase voltage does not match the first voltage range; and determining that the three-phase voltage matches the first voltage range when the voltage detection values ​​of all phases of the three-phase voltage match the first voltage range.

[0011] In this technical solution, the step of matching the detected values ​​of the three-phase voltage with a first voltage range includes: firstly, determining the voltage detection value of each phase of the three-phase voltage based on the detected values ​​of the three-phase voltage, that is, obtaining the voltage detection values ​​of phase A, phase B, and phase C of the three-phase voltage respectively. Then, matching the voltage detection value of each phase of the three-phase voltage with the first voltage range, that is, matching the voltage detection values ​​of phase A, phase B, and phase C with the first voltage range respectively. If any one of the voltage detection values ​​of phase A, phase B, and phase C is not within the first voltage range, then it is determined that the three-phase voltage does not match the first voltage range. When the voltage detection values ​​of phase A, phase B, and phase C are all within the first voltage range, then it is determined that the three-phase voltage matches the first voltage range. By matching the voltage detection value of each phase of the three-phase voltage with the first voltage range, the accuracy of the detection is ensured, and the problem of three-phase voltage imbalance can also be determined.

[0012] In some technical solutions, optionally, the step of controlling the charging and discharging of an energy storage device connected to the distribution grid based on the detected values ​​of the three-phase voltages, the maximum voltage value in the first voltage range, and the minimum voltage value in the first voltage range includes: determining the detected value of the first phase voltage when the detected values ​​of the three-phase voltages do not match the first voltage range, wherein the first phase voltage is the voltage of the phase in the three-phase voltages that does not match the first voltage range; controlling the first phase of the distribution grid to charge the energy storage device when the detected value of the first phase voltage is greater than the maximum voltage value, wherein the first phase corresponds to the first phase voltage; and controlling the energy storage device to discharge the first phase of the distribution grid when the detected value of the first phase voltage is less than the minimum voltage value.

[0013] In this technical solution, the steps of controlling the charging and discharging of the energy storage device connected to the power grid in the distribution area based on the detected values ​​of the three-phase voltages, the maximum voltage value in the first voltage range, and the minimum voltage value in the first voltage range include: when the three-phase voltages do not match the first voltage range, firstly, the detected value of the first phase voltage is determined based on the detected values ​​of the three-phase voltages. The first phase voltage is the voltage of the phase in the three-phase voltage range that does not match the first voltage range; that is, it is first determined which phase voltage does not match the first voltage range, i.e., which phase is abnormal. After obtaining the detected value of the first phase voltage, i.e., the voltage detection value of the abnormal phase, the detected value of the first phase voltage is compared with the maximum voltage value and the minimum voltage value respectively. When the detected value of the first phase voltage is greater than the maximum voltage value, it indicates that this phase has a high voltage condition. Then, the first phase of the power grid in the distribution area is controlled to charge the energy storage device. The first phase corresponds to the first phase voltage; that is, the phase with the higher voltage in the power grid in the distribution area is controlled to supply electrical energy to the energy storage device to reduce the voltage of the phase with the higher voltage. When the detected value of the first phase voltage is less than the minimum voltage value, it indicates that a low-voltage situation has occurred in this phase. The energy storage device is then controlled to discharge the first phase of the power grid in the distribution area. The first phase corresponds to the first phase voltage; that is, the energy storage device only discharges the phase in the power grid experiencing a low-voltage situation to increase the voltage of the abnormal phase. Controlling the energy storage device to discharge the first phase of the power grid means controlling the energy storage device to supply electrical energy to the first phase of the power grid. In this invention, when the voltage of one or more phases (A / B / C) of the power grid is below standard, the energy storage device is controlled to charge or discharge the substandard phase individually. This achieves the goal of independent regulation of the three-phase voltage without interference, and even if single-phase high voltage and single-phase low voltage occur simultaneously, the grid voltage can be effectively managed.

[0014] In some technical solutions, optionally, the step of charging the energy storage device with the first phase of the control area power grid includes: increasing the charging power of the energy storage device by a first preset step size and obtaining the detection value of the first phase voltage; when the detection value of the first phase voltage is less than the maximum voltage value and the detection value of the first phase voltage is greater than the second voltage value, continuing to increase the charging power of the energy storage device by a second preset step size, wherein the second preset step size is less than the first preset step size; when the detection value of the first phase voltage is less than the second voltage value and the detection value of the first phase voltage is greater than the third voltage value, maintaining the charging power of the energy storage device; and when the detection value of the first phase voltage is less than the third voltage value and the detection value of the first phase voltage is greater than the fourth voltage value, decreasing the charging power of the energy storage device.

[0015] In this technical solution, the steps for controlling the first phase of the control area power grid to charge the energy storage device include: firstly, controlling the energy storage device to start charging the first phase of the control area power grid, and gradually increasing the charging power of the energy storage device according to a first preset step size to reduce the voltage of the first phase. Here, the preset step size refers to the increase in charging power per unit time. While increasing the charging power of the energy storage device, it is also necessary to acquire the detected value of the first phase voltage in real time. When the detected value of the first phase voltage is less than the maximum voltage value and greater than the second voltage value, the charging power of the energy storage device is further increased according to a second preset step size. Here, the second preset step size is less than the first preset step size; that is, when the first phase voltage drops to between the maximum and second voltage values, the rate of increase in charging power is reduced, and the charging power of the energy storage device continues to increase, causing the first phase voltage to continue to decrease. When the detected value of the first phase voltage is less than the second voltage value and greater than the third voltage value, the current charging power of the energy storage device is maintained. In other words, when the first-phase voltage drops to between the second and third voltage values, the charging power of the energy storage device is no longer increased, allowing the first-phase voltage to be maintained within the current voltage range. When the detected value of the first-phase voltage is less than the third voltage value and greater than the fourth voltage value, the charging power of the energy storage device is reduced. That is, when the first-phase voltage drops to between the third and fourth voltage values, the charging power of the energy storage device begins to decrease, causing the first-phase voltage to rise, ultimately ensuring that when the charging power is zero, the first-phase voltage is maintained between the third and second voltage values. This invention, by controlling the charging power of the energy storage device based on the detected value of the first-phase voltage when a high-voltage situation occurs, maintains the first-phase voltage between the second and third voltage values, thereby completing the high-voltage management of the power grid in the distribution area using the energy storage device.

[0016] In some technical solutions, optionally, the step of controlling the energy storage device to discharge the first phase of the power grid includes: increasing the discharge power of the energy storage device by a third preset step size and obtaining the detection value of the first phase voltage; when the detection value of the first phase voltage is greater than the minimum voltage value and less than the fifth voltage value, continuing to increase the discharge power of the energy storage device by a fourth preset step size, wherein the fourth preset step size is less than the third preset step size; maintaining the discharge power of the energy storage device when the detection value of the first phase voltage is greater than the fifth voltage value and less than the sixth voltage value; and reducing the discharge power of the energy storage device when the detection value of the first phase voltage is greater than the sixth voltage value and less than the seventh voltage value.

[0017] In this technical solution, the steps for controlling the energy storage device to discharge the first phase of the power grid include: firstly, controlling the energy storage device to start discharging the first phase of the power grid, and gradually increasing the discharge power of the energy storage device according to a third preset step size to increase the voltage of the first phase. Here, the preset step size refers to the amount of power reduction per unit time. While increasing the discharge power of the energy storage device, it is also necessary to acquire the detected value of the first phase voltage in real time. When the detected value of the first phase voltage is greater than the minimum voltage value and less than the fifth voltage value, the discharge power of the energy storage device is further increased according to a fourth preset step size. Here, the fourth preset step size is less than the fifth preset step size; that is, when the first phase voltage increases to between the minimum voltage value and the fifth voltage value, the rate of increase in discharge power is reduced, and the discharge power of the energy storage device continues to increase, causing the first phase voltage to continue to increase. When the detected value of the first phase voltage is greater than the fifth voltage value and less than the sixth voltage value, the current discharge power of the energy storage device is maintained. In other words, when the first phase voltage increases to between the fifth and sixth voltage values, the discharge power of the energy storage device is no longer increased, allowing the first phase voltage to be maintained within the current voltage range. When the detected value of the first phase voltage is greater than the sixth voltage value and less than the seventh voltage value, the discharge power of the energy storage device is reduced. That is, when the first phase voltage increases to between the sixth and seventh voltage values, the discharge power of the energy storage device begins to decrease, causing the first phase voltage to drop. Ultimately, when the discharge power is zero, the first phase voltage can be maintained between the fifth and sixth voltage values. The seventh voltage value can be equal to the fourth voltage value, and both the seventh and fourth voltage values ​​can be the voltage values ​​when the first phase voltage is operating normally. This invention, by controlling the discharge power of the energy storage device based on the detected value of the first phase voltage when a low-voltage situation occurs, maintains the first phase voltage between the fifth and sixth voltage values, thereby completing the low-voltage management of the power grid in the distribution area using the energy storage device.

[0018] In some technical solutions, optionally, the step of controlling the charging and discharging of the energy storage device based on the first time and the remaining power of the energy storage device includes: acquiring historical data of the power grid in the distribution area; determining the low-voltage governance preparation time period, low-voltage governance time period, high-voltage governance preparation time period, and high-voltage governance time period of the energy storage device based on the historical data; and controlling the charging and discharging of the energy storage device based on the low-voltage governance preparation time period, low-voltage governance time period, high-voltage governance preparation time period, high-voltage governance time period, the first time, and the remaining power of the energy storage device.

[0019] In this technical solution, the steps of controlling the charging and discharging of the energy storage device based on the first time and the remaining power of the energy storage device include: First, acquiring historical data of the power grid in the distribution area, including the time periods during which high-voltage and low-voltage conditions occurred in the distribution area over the past few days. Then, predicting the low-voltage and high-voltage governance periods for the energy storage device on that day based on the historical data. During the low-voltage governance period, the energy storage device may need to perform low-voltage governance; during the high-voltage governance period, the energy storage device may need to perform high-voltage governance. Simultaneously, since the energy storage device needs to ensure sufficient energy for charging or discharging during high-voltage or low-voltage governance, the time period before the low-voltage governance period is designated as the low-voltage governance preparation period, and the time period before the high-voltage governance period is designated as the high-voltage governance preparation period. During the low-voltage governance preparation period, the energy storage device may need to charge to ensure sufficient energy for discharging during the low-voltage governance period. During the high-voltage governance preparation period, the energy storage device may need to discharge to ensure charging during the high-voltage governance period. After determining the low-voltage treatment preparation period, low-voltage treatment period, high-voltage treatment preparation period, and high-voltage treatment period, the charging and discharging of the energy storage device is controlled based on the remaining power of the energy storage device and which of the above time periods it is in at the moment. By determining the low-voltage treatment preparation period, low-voltage treatment period, high-voltage treatment preparation period, and high-voltage treatment period of the energy storage device based on historical data, the operating status of the energy storage device can be predicted.

[0020] In some technical solutions, optionally, the steps of controlling the charging and discharging of the energy storage device based on the low-voltage governance preparation period, the low-voltage governance period, the high-voltage governance preparation period, the high-voltage governance period, the first time, and the remaining power of the energy storage device include: controlling the energy storage device to charge when the first time is within the low-voltage governance preparation period and the remaining power of the energy storage device is less than a first power; controlling the energy storage device to discharge when the first time is within the high-voltage governance preparation period and the remaining power of the energy storage device is greater than a second power, wherein the first power is greater than the second power; and controlling the energy storage device not to charge or discharge when the first time is within the high-voltage governance period or the low-voltage governance period.

[0021] In this technical solution, the steps of controlling the charging and discharging of the energy storage device based on the low-voltage governance preparation time period, the low-voltage governance time period, the high-voltage governance preparation time period, the high-voltage governance time period, the first time, and the remaining power of the energy storage device include: matching the first time with the low-voltage governance preparation time period, the low-voltage governance time period, the high-voltage governance preparation time period, and the high-voltage governance time period respectively; and matching the remaining power of the energy storage device with the first power and the second power respectively, wherein the first power is greater than the second power, the first power is close to the maximum power that the energy storage device can hold, and the second power is close to the minimum power that the energy storage device can hold. When the first time is within the low-voltage governance preparation time period and the remaining power of the energy storage device is less than the first power, the energy storage device is controlled to charge to increase the power of the energy storage device, ensuring that the energy storage device has sufficient power to discharge during low-voltage governance; and when the remaining power of the energy storage device increases to be greater than or equal to the first power, the energy storage device is controlled to stop charging. When the first timeframe falls within the high-voltage governance preparation period, and the remaining charge of the energy storage device is greater than the second charge level, the energy storage device is controlled to discharge to reduce its charge level. This ensures that the energy storage device has sufficient capacity to receive power from the distribution grid during high-voltage governance. When the remaining charge of the energy storage device decreases to less than or equal to the second charge level, the energy storage device stops discharging. When the first timeframe falls within the high-voltage governance period or the low-voltage governance period, it can be understood that the detected three-phase voltage values ​​are within the first voltage range, meaning the three-phase voltage is in a normal state. Since it is predicted that the energy storage device may perform high-voltage or low-voltage governance during the high-voltage or low-voltage governance period, to maintain the three-phase voltage in a normal state and ensure that the energy storage device has sufficient energy for high-voltage or low-voltage governance afterward, the energy storage device is controlled not to charge or discharge when the first timeframe falls within the high-voltage governance period or the low-voltage governance period. By controlling the energy storage device to pre-charge or pre-discharge, it maintains an appropriate energy reserve state before the time when it may need to participate in voltage governance.

[0022] According to a second aspect of the present invention, a voltage regulation system for a distribution substation is provided, comprising: a first acquisition module for acquiring the detected values ​​of the three-phase voltages of the substation power grid and a first time; a first matching module for matching the detected values ​​of the three-phase voltages with a first voltage range; a first processing module for controlling the charging and discharging of an energy storage device connected to the substation power grid based on the detected values ​​of the three-phase voltages, the maximum voltage value in the first voltage range, and the minimum voltage value in the first voltage range when the detected values ​​of the three-phase voltages do not match the first voltage range; and a second processing module for controlling the charging and discharging of the energy storage device based on the first time and the remaining power of the energy storage device when the detected values ​​of the three-phase voltages match the first voltage range.

[0023] The voltage regulation system for a distribution substation provided by this invention mainly includes: a first acquisition module, a first matching module, a first processing module, and a second processing module. The first acquisition module first acquires the detected values ​​of the three-phase voltages of the substation power grid and a first time, where the first time refers to the current time. Subsequently, the first matching module matches the detected values ​​of the three-phase voltages with a first voltage range, where the first voltage range is determined by the voltage values ​​of the three-phase voltages when the substation power grid is operating normally. When the detected values ​​of the three-phase voltages do not match the first voltage range, i.e., when the detected values ​​of the three-phase voltages are not within the first voltage range, it indicates that the three-phase voltages of the substation power grid are abnormal. The first processing module then controls the charging and discharging of the energy storage device connected to the substation power grid based on the detected values ​​of the three-phase voltages, the maximum voltage value within the first voltage range, and the minimum voltage value within the first voltage range. Specifically, when the three-phase voltage is abnormal, the detected values ​​of the three-phase voltages are compared with the maximum and minimum voltage values ​​within the first voltage range to determine the abnormal information, and then the energy storage device connected to the substation power grid is controlled to charge or discharge based on the abnormal information. When the detected three-phase voltage values ​​match the first voltage range (i.e., the detected three-phase voltage values ​​are within the first voltage range), it indicates that the three-phase voltage is normal. The second processing module then controls the charging and discharging of the energy storage device based on the first time and the remaining power of the energy storage device. It is understandable that due to user habits and distributed photovoltaic (PV) integration, low or high grid voltage conditions are likely to occur at certain times of the day. Therefore, it is necessary to control the energy storage device to pre-discharge or charge before these specific time periods to ensure that the energy storage device has sufficient power to handle low or high grid voltage conditions. Therefore, when the three-phase voltage is within the first voltage range, the charging or discharging of the energy storage device is controlled based on the current time and the remaining power of the energy storage device. This invention, by controlling the energy storage device to perform different operations based on the relationship between the detected three-phase voltage values, the maximum voltage value, and the minimum voltage value when the three-phase voltage is in an abnormal state, achieves automatic management of the three-phase voltage in the distribution area without the need for transformer expansion or line modification, and without manual monitoring and intervention. Meanwhile, this invention ensures that the energy storage device has sufficient energy to handle situations where the grid voltage is low or high by controlling the energy storage device to perform different tasks according to the current first time when the three-phase voltage is normal.

[0024] According to a third aspect of the present invention, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the voltage regulation method for a distribution station as described above.

[0025] The electronic device provided by the present invention, when the processor executes the computer program, implements the steps of the voltage regulation method of the above-mentioned distribution radio area, and can achieve the technical effects of any of the above technical solutions, which will not be repeated here.

[0026] According to a fourth aspect of the invention, a storage medium is provided on which a computer program is stored, which, when executed by a processor, implements the steps of the voltage regulation method for a distribution station as described above.

[0027] The storage medium provided by this invention, when the computer program is executed by the processor, implements the steps of the voltage regulation method of the above-mentioned distribution radio station, and can achieve the technical effects of any of the above technical solutions, which will not be elaborated here.

[0028] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0030] Figure 1 One of the schematic flowcharts of a voltage regulation method for a distribution radio station area according to an embodiment of the present invention is shown;

[0031] Figure 2 The diagram illustrates a step in a voltage regulation method for a distribution substation according to an embodiment of the present invention, which involves matching the detected values ​​of the three-phase voltage with a first voltage range.

[0032] Figure 3 The diagram illustrates a step in a voltage regulation method for a distribution substation according to an embodiment of the present invention, which involves controlling the charging and discharging of an energy storage device connected to the substation power grid based on the detected value of the three-phase voltage, the maximum voltage value in a first voltage range, and the minimum voltage value in the first voltage range.

[0033] Figure 4 This is a flowchart illustrating the step of charging the first relative energy storage device of the control area power grid in a voltage regulation method for a distribution area according to an embodiment of the present invention.

[0034] Figure 5 This diagram illustrates a step in controlling the energy storage device to discharge to the first phase of the power grid in a voltage regulation method for a distribution substation according to an embodiment of the present invention.

[0035] Figure 6 A flowchart illustrating the steps of controlling the charging and discharging of an energy storage device based on a first time and the remaining power of the energy storage device in a voltage regulation method for a distribution substation according to an embodiment of the present invention is shown.

[0036] Figure 7 The diagram illustrates a step in a voltage regulation method for a distribution substation according to an embodiment of the present invention, which involves controlling the charging and discharging of an energy storage device based on a low-voltage governance preparation period, a low-voltage governance period, a high-voltage governance preparation period, a high-voltage governance period, a first time, and the remaining power of the energy storage device.

[0037] Figure 8 One of the schematic diagrams illustrating the principle of a voltage regulation method for a distribution radio station according to an embodiment of the present invention is shown;

[0038] Figure 9 This is a second schematic diagram illustrating the principle of a voltage regulation method for a distribution radio station according to an embodiment of the present invention;

[0039] Figure 10 The third schematic diagram illustrates the principle of a voltage regulation method for a distribution radio station according to an embodiment of the present invention;

[0040] Figure 11 A second schematic flowchart of a voltage regulation method for a distribution radio station area according to an embodiment of the present invention is shown;

[0041] Figure 12 A schematic block diagram of a voltage regulation system for a distribution radio station area according to an embodiment of the present invention is shown;

[0042] Figure 13 A schematic block diagram of an electronic device according to an embodiment of the present invention is shown. Detailed Implementation

[0043] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0044] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0045] Figure 1 A schematic flowchart of a voltage regulation method for a distribution station area according to an embodiment of the present invention is shown. The voltage regulation method for the distribution station area includes:

[0046] Step 102: Obtain the detected values ​​and first time of the three-phase voltage of the power grid in the distribution area;

[0047] Step 104: Match the detected values ​​of the three-phase voltage with the first voltage range;

[0048] Step 106: When the detected value of the three-phase voltage does not match the first voltage range, control the charging and discharging of the energy storage device connected to the power grid in the distribution area according to the detected value of the three-phase voltage, the maximum voltage value in the first voltage range, and the minimum voltage value in the first voltage range.

[0049] Step 108: When the detected value of the three-phase voltage matches the first voltage range, control the charging and discharging of the energy storage device according to the first time and the remaining power of the energy storage device.

[0050] The voltage regulation method for a distribution substation provided by this invention mainly includes: firstly, acquiring the detected values ​​of the three-phase voltage of the substation power grid and a first time, where the first time refers to the current time. Then, matching the detected values ​​of the three-phase voltage with a first voltage range, where the first voltage range is determined by the voltage values ​​of the three-phase voltage when the substation power grid is operating normally. When the detected values ​​of the three-phase voltage do not match the first voltage range, i.e., when the detected values ​​of the three-phase voltage are not within the first voltage range, it indicates that the three-phase voltage of the substation power grid is abnormal. Then, based on the detected values ​​of the three-phase voltage, the maximum voltage value in the first voltage range, and the minimum voltage value in the first voltage range, the charging and discharging of the energy storage device connected to the substation power grid is controlled. That is, when the three-phase voltage is abnormal, the detected values ​​of the three-phase voltage are compared with the maximum and minimum voltage values ​​in the first voltage range, respectively. When the detected values ​​of the three-phase voltage are less than the minimum voltage value, it indicates that the three-phase voltage of the substation power grid is low. Then, the energy storage device connected to the substation power grid is controlled to discharge to compensate for the three-phase voltage and bring it back to a normal state. When the detected value of the three-phase voltage is less than the maximum voltage value, it indicates that the three-phase voltage output by the power grid in the distribution area is under high voltage. In this case, the energy storage device connected to the power grid in the distribution area is controlled to charge in order to consume the three-phase voltage and reduce the three-phase voltage to a normal state.

[0051] When the detected three-phase voltage values ​​match the first voltage range (i.e., the detected values ​​are within the first voltage range), it indicates that the three-phase voltage is normal. Then, the energy storage device's charging and discharging is controlled based on the first time and the remaining power of the energy storage device. It's understandable that due to user habits and distributed photovoltaic (PV) integration, certain periods of the day may experience low or high grid voltage. Therefore, it's necessary to pre-discharge or charge the energy storage device before these specific periods to ensure sufficient power to handle low or high grid voltage situations. So, when the detected three-phase voltage values ​​match the first voltage range, it can be determined whether the current time is before a period prone to low or high grid voltage. If it's before a period prone to low grid voltage, the energy storage device is charged based on its remaining power to ensure sufficient energy for discharge in the event of low grid voltage. Conversely, if it's before a period prone to low grid voltage, the energy storage device is discharged based on its remaining power to ensure sufficient energy for charging in the event of high grid voltage.

[0052] This invention achieves automatic three-phase voltage management in a distribution area without the need for transformer expansion or line modifications, by controlling the energy storage device to perform different functions based on the relationship between the detected, maximum, and minimum three-phase voltage values ​​when the three-phase voltage is abnormal. Simultaneously, when the three-phase voltage is normal, the invention ensures that the energy storage device has sufficient energy to handle situations of low or high grid voltage.

[0053] Figure 2 A flowchart illustrating the step of matching the detected three-phase voltage values ​​with a first voltage range in a voltage regulation method for a distribution substation according to an embodiment of the present invention is shown; wherein, the step of matching the detected three-phase voltage values ​​with the first voltage range includes:

[0054] Step 202: Determine the voltage detection value of each phase in the three-phase voltage based on the detected values ​​of the three-phase voltage;

[0055] Step 204: Match the voltage detection value of each phase of the three-phase voltage with the first voltage range;

[0056] Step 206: When the voltage detection value of any one phase of the three-phase voltage does not match the first voltage range, determine that the three-phase voltage does not match the first voltage range;

[0057] Step 208: When the voltage detection values ​​of all phases in the three-phase voltage match the first voltage range, it is determined that the three-phase voltage matches the first voltage range.

[0058] In this embodiment, the step of matching the detected values ​​of the three-phase voltage with a first voltage range includes: firstly, determining the voltage detection value of each phase of the three-phase voltage based on the detected values ​​of the three-phase voltage, that is, obtaining the voltage detection values ​​of phase A, phase B, and phase C of the three-phase voltage respectively. Then, matching the voltage detection value of each phase of the three-phase voltage with the first voltage range, that is, matching the voltage detection values ​​of phase A, phase B, and phase C with the first voltage range respectively. If any one of the voltage detection values ​​of phase A, phase B, and phase C is not within the first voltage range, then it is determined that the three-phase voltage does not match the first voltage range. When the voltage detection values ​​of phase A, phase B, and phase C are all within the first voltage range, then it is determined that the three-phase voltage matches the first voltage range. By matching the voltage detection value of each phase of the three-phase voltage with the first voltage range, the accuracy of the detection is ensured, and the problem of three-phase voltage imbalance can also be determined.

[0059] Figure 3 This diagram illustrates a step in a voltage regulation method for a distribution substation according to an embodiment of the present invention: controlling the charging and discharging of an energy storage device connected to the substation power grid based on detected three-phase voltage values, the maximum voltage value within a first voltage range, and the minimum voltage value within a first voltage range. The step of controlling the charging and discharging of the energy storage device connected to the substation power grid based on detected three-phase voltage values, the maximum voltage value within a first voltage range, and the minimum voltage value within a first voltage range includes:

[0060] Step 302: When the detected value of the three-phase voltage does not match the first voltage range, determine the detected value of the first phase voltage, wherein the first phase voltage is the voltage of the phase in the three-phase voltage that does not match the first voltage range;

[0061] Step 304: When the detected value of the first phase voltage is greater than the maximum voltage value, the first phase of the control area power grid is charged to the energy storage device, wherein the first phase corresponds to the first phase voltage;

[0062] Step 306: When the detected value of the first phase voltage is less than the minimum voltage value, control the energy storage device to discharge the first phase of the power grid in the distribution area.

[0063] In this embodiment, the steps of controlling the charging and discharging of the energy storage device connected to the power grid in the distribution area based on the detected values ​​of the three-phase voltages, the maximum voltage value in the first voltage range, and the minimum voltage value in the first voltage range include: when the three-phase voltages do not match the first voltage range, firstly, determining the detected value of the first phase voltage based on the detected values ​​of the three-phase voltages, wherein the first phase voltage is the voltage of the phase in the three-phase voltages that does not match the first voltage range, that is, firstly determining which phase voltage in the three-phase voltages does not match the first voltage range, i.e., which phase in the three-phase voltages is abnormal. After obtaining the detected value of the first phase voltage, i.e., the voltage detected value of the abnormal phase, the detected value of the first phase voltage is compared with the maximum voltage value and the minimum voltage value respectively. When the detected value of the first phase voltage is greater than the maximum voltage value, it indicates that this phase has a high voltage condition, and the first phase of the power grid in the distribution area is controlled to charge the energy storage device, wherein the first phase corresponds to the first phase voltage, i.e., the phase with higher voltage in the power grid in the distribution area is controlled to supply electrical energy to the energy storage device to reduce the voltage of the phase with higher voltage. When the detected value of the first phase voltage is less than the minimum voltage value, it indicates that a low-voltage situation has occurred in this phase. The energy storage device is then controlled to discharge the first phase of the power grid in the distribution area. The first phase corresponds to the first phase voltage; that is, the energy storage device only discharges the phase in the power grid experiencing a low-voltage situation to increase the voltage of the abnormal phase. Controlling the energy storage device to discharge the first phase of the power grid means controlling the energy storage device to supply electrical energy to the first phase of the power grid. In this invention, when the voltage of one or more phases (A / B / C) of the power grid is below standard, the energy storage device is controlled to charge or discharge the substandard phase individually. This achieves the goal of independent regulation of the three-phase voltage without interference, and even if single-phase high voltage and single-phase low voltage occur simultaneously, the grid voltage can be effectively managed.

[0064] Figure 4 The diagram illustrates a step in a voltage regulation method for a distribution substation according to an embodiment of the present invention: charging a first relative energy storage device of the control substation power grid. The step of charging the first relative energy storage device of the control substation power grid includes:

[0065] Step 402: Increase the charging power of the energy storage device according to the first preset step size, and obtain the detection value of the first phase voltage;

[0066] Step 404: When the detected value of the first phase voltage is less than the maximum voltage value and the detected value of the first phase voltage is greater than the second voltage value, the charging power of the energy storage device is increased by a second preset step size, wherein the second preset step size is less than the first preset step size.

[0067] Step 406: When the detected value of the first phase voltage is less than the second voltage value and the detected value of the first phase voltage is greater than the third voltage value, maintain the charging power of the energy storage device;

[0068] Step 408: When the detected value of the first phase voltage is less than the third voltage value and the detected value of the first phase voltage is greater than the fourth voltage value, reduce the charging power of the energy storage device.

[0069] In this embodiment, the step of controlling the first phase of the control area power grid to charge the energy storage device includes: firstly, controlling the energy storage device to start charging the first phase of the control area power grid, and gradually increasing the charging power of the energy storage device according to a first preset step size to reduce the voltage of the first phase, wherein the preset step size refers to the increase in charging power per unit time. While increasing the charging power of the energy storage device, it is also necessary to obtain the detection value of the first phase voltage in real time. When the detection value of the first phase voltage is less than the maximum voltage value and greater than the second voltage value, the charging power of the energy storage device is further increased according to a second preset step size, wherein the second preset step size is less than the first preset step size. That is, when the first phase voltage drops to between the maximum voltage value and the second voltage value, the rate of increase in charging power is reduced, and the charging power of the energy storage device is further increased to continue reducing the first phase voltage. When the detection value of the first phase voltage is less than the second voltage value and greater than the third voltage value, the current charging power of the energy storage device is maintained. In other words, when the first-phase voltage drops to between the second and third voltage values, the charging power of the energy storage device is no longer increased, allowing the first-phase voltage to be maintained within the current voltage range. When the detected value of the first-phase voltage is less than the third voltage value and greater than the fourth voltage value, the charging power of the energy storage device is reduced. That is, when the first-phase voltage drops to between the third and fourth voltage values, the charging power of the energy storage device begins to decrease, causing the first-phase voltage to rise, ultimately ensuring that when the charging power is zero, the first-phase voltage is maintained between the third and second voltage values. This invention, by controlling the charging power of the energy storage device based on the detected value of the first-phase voltage when a high-voltage situation occurs, maintains the first-phase voltage between the second and third voltage values, thereby completing the high-voltage management of the power grid in the distribution area using the energy storage device.

[0070] Figure 5 A flowchart illustrating the step of controlling the energy storage device to discharge to the first phase of the power grid in a voltage regulation method for a distribution substation according to an embodiment of the present invention is shown; wherein, the step of controlling the energy storage device to discharge to the first phase of the power grid includes:

[0071] Step 502: Increase the discharge power of the energy storage device according to the third preset step size, and obtain the detection value of the first phase voltage;

[0072] Step 504: When the detected value of the first phase voltage is greater than the minimum voltage value and the detected value of the first phase voltage is less than the fifth voltage value, the discharge power of the energy storage device is increased by the fourth preset step size, wherein the fourth preset step size is less than the third preset step size.

[0073] Step 506: When the detected value of the first phase voltage is greater than the fifth voltage value and the detected value of the first phase voltage is less than the sixth voltage value, maintain the discharge power of the energy storage device;

[0074] Step 508: When the detected value of the first phase voltage is greater than the sixth voltage value and the detected value of the first phase voltage is less than the seventh voltage value, reduce the discharge power of the energy storage device.

[0075] In this embodiment, the step of controlling the energy storage device to discharge the first phase of the power grid includes: firstly, controlling the energy storage device to start discharging the first phase of the power grid, and gradually increasing the discharge power of the energy storage device according to a third preset step size to increase the voltage of the first phase, wherein the preset step size refers to the amount of reduction in discharge power per unit time. While increasing the discharge power of the energy storage device, it is also necessary to obtain the detection value of the first phase voltage in real time. When the detection value of the first phase voltage is greater than the minimum voltage value and less than the fifth voltage value, the discharge power of the energy storage device is further increased according to a fourth preset step size, wherein the fourth preset step size is less than the fifth preset step size. That is, when the first phase voltage increases to between the minimum voltage value and the fifth voltage value, the rate of increase in discharge power is reduced, and the discharge power of the energy storage device continues to increase, causing the first phase voltage to continue to increase. When the detection value of the first phase voltage is greater than the fifth voltage value and less than the sixth voltage value, the current discharge power of the energy storage device is maintained. In other words, when the first phase voltage increases to between the fifth and sixth voltage values, the discharge power of the energy storage device is no longer increased, allowing the first phase voltage to be maintained within the current voltage range. When the detected value of the first phase voltage is greater than the sixth voltage value and less than the seventh voltage value, the discharge power of the energy storage device is reduced. That is, when the first phase voltage increases to between the sixth and seventh voltage values, the discharge power of the energy storage device begins to decrease, causing the first phase voltage to drop. Ultimately, when the discharge power is zero, the first phase voltage can be maintained between the fifth and sixth voltage values. The seventh voltage value can be equal to the fourth voltage value, and both the seventh and fourth voltage values ​​can be the voltage values ​​when the first phase voltage is operating normally. This invention, by controlling the discharge power of the energy storage device based on the detected value of the first phase voltage when a low-voltage situation occurs, maintains the first phase voltage between the fifth and sixth voltage values, thereby completing the low-voltage management of the power grid in the distribution area using the energy storage device.

[0076] Figure 6A flowchart illustrating the step of controlling the charging and discharging of an energy storage device based on a first time and the remaining power of the energy storage device in a voltage regulation method for a distribution substation according to an embodiment of the present invention is shown; wherein, the step of controlling the charging and discharging of the energy storage device based on a first time and the remaining power of the energy storage device includes:

[0077] Step 602: Obtain historical data of the power grid in the distribution area;

[0078] Step 604: Determine the low-pressure treatment preparation period, low-pressure treatment period, high-pressure treatment preparation period, and high-pressure treatment period of the energy storage device based on historical data;

[0079] Step 606: Control the charging and discharging of the energy storage device based on the low-voltage treatment preparation time period, the low-voltage treatment time period, the high-voltage treatment preparation time period, the high-voltage treatment time period, the first time, and the remaining power of the energy storage device.

[0080] In this embodiment, the step of controlling the charging and discharging of the energy storage device based on the first time and the remaining power of the energy storage device includes: firstly, acquiring historical data of the power grid in the distribution area, including the time periods during which high-voltage and low-voltage conditions occurred in the distribution area power grid over the past few days. Then, based on the historical data, predicting the low-voltage and high-voltage governance periods for the energy storage device on that day. During the low-voltage governance period, the energy storage device may need to perform low-voltage governance; during the high-voltage governance period, the energy storage device may need to perform high-voltage governance. Simultaneously, since the energy storage device needs to ensure sufficient energy for charging or discharging during high-voltage or low-voltage governance, the time period before the low-voltage governance period is designated as the low-voltage governance preparation period, and the time period before the high-voltage governance period is designated as the high-voltage governance preparation period. During the low-voltage governance preparation period, the energy storage device may need to charge to ensure sufficient energy for discharging during the low-voltage governance period. During the high-voltage governance preparation period, the energy storage device may need to discharge to ensure charging during the high-voltage governance period. After determining the low-voltage treatment preparation period, low-voltage treatment period, high-voltage treatment preparation period, and high-voltage treatment period, the charging and discharging of the energy storage device is controlled based on the remaining power of the energy storage device and which of the above time periods it is in at the moment. By determining the low-voltage treatment preparation period, low-voltage treatment period, high-voltage treatment preparation period, and high-voltage treatment period of the energy storage device based on historical data, the operating status of the energy storage device can be predicted.

[0081] Figure 7This diagram illustrates a step in a voltage regulation method for a distribution substation according to an embodiment of the present invention: controlling the charging and discharging of an energy storage device based on a low-voltage governance preparation period, a low-voltage governance period, a high-voltage governance preparation period, a high-voltage governance period, a first time, and the remaining power of the energy storage device. The step of controlling the charging and discharging of the energy storage device based on the low-voltage governance preparation period, the low-voltage governance period, the high-voltage governance preparation period, the high-voltage governance period, the first time, and the remaining power of the energy storage device includes:

[0082] Step 702: Based on the fact that the first time is within the low-voltage governance preparation period and the remaining power of the energy storage device is less than the first power, control the energy storage device to charge;

[0083] Step 704: Based on the fact that the first time is within the high-voltage governance preparation period and the remaining power of the energy storage device is greater than the second power, control the energy storage device to discharge, wherein the first power is greater than the second power;

[0084] Step 706: Based on the first time being within the high-voltage governance period or the low-voltage governance period, control the energy storage device not to charge or discharge.

[0085] In this embodiment, the step of controlling the charging and discharging of the energy storage device based on the low-voltage governance preparation time period, the low-voltage governance time period, the high-voltage governance preparation time period, the high-voltage governance time period, the first time, and the remaining power of the energy storage device includes: matching the first time with the low-voltage governance preparation time period, the low-voltage governance time period, the high-voltage governance preparation time period, and the high-voltage governance time period respectively; and matching the remaining power of the energy storage device with the first power and the second power respectively, wherein the first power is greater than the second power, the first power is close to the maximum power that the energy storage device can hold, and the second power is close to the minimum power that the energy storage device can hold. When the first time is within the low-voltage governance preparation time period and the remaining power of the energy storage device is less than the first power, the energy storage device is controlled to charge to increase the power of the energy storage device, ensuring that the energy storage device has sufficient power to discharge during low-voltage governance; wherein, when the remaining power of the energy storage device increases to be greater than or equal to the first power, the energy storage device is controlled to stop charging. When the first timeframe falls within the high-voltage governance preparation period, and the remaining charge of the energy storage device is greater than the second charge level, the energy storage device is controlled to discharge to reduce its charge level. This ensures that the energy storage device has sufficient capacity to receive power from the distribution grid during high-voltage governance. When the remaining charge of the energy storage device decreases to less than or equal to the second charge level, the energy storage device stops discharging. When the first timeframe falls within the high-voltage governance period or the low-voltage governance period, it can be understood that the detected three-phase voltage values ​​are within the first voltage range, meaning the three-phase voltage is in a normal state. Since it is predicted that the energy storage device may perform high-voltage or low-voltage governance during the high-voltage or low-voltage governance period, to maintain the three-phase voltage in a normal state and ensure that the energy storage device has sufficient energy for high-voltage or low-voltage governance afterward, the energy storage device is controlled not to charge or discharge when the first timeframe falls within the high-voltage governance period or the low-voltage governance period. By controlling the energy storage device to pre-charge or pre-discharge, it maintains an appropriate energy reserve state before the time when it may need to participate in voltage governance.

[0086] The voltage regulation method for distribution transformer substations provided by this invention is an intelligent control method for dynamic management of the terminal voltage of low-voltage distribution transformer substations (hereinafter referred to as "substations"). It is particularly suitable for solving voltage exceedance problems caused by load fluctuations, distributed energy access, and three-phase imbalance in scenarios such as rural power grids and old urban residential areas. The voltage regulation method for distribution transformer substations includes the following steps:

[0087] The first step is to obtain the three-phase voltage detection values ​​of the power grid in the low-voltage distribution area.

[0088] The second step is to compare the measured three-phase voltage values ​​of the distribution area's power grid with the nominal voltage values, and then determine the relationship between the two values, such as... Figure 8 As shown, the three-phase voltage detection values ​​are divided into 8 intervals, named Zones 1 to 8. The boundary points of each interval are calculated based on pre-set voltage management parameters. Different voltage management strategies are implemented in different intervals. Specifically, the low-voltage management strategy operates in Zones 1-4, and the high-voltage management strategy operates in Zones 5-8. The meanings of each interval are as follows: Zone 1 is the low-voltage management trigger interval. When the three-phase voltage detection value is in Zone 1, the low-voltage management strategy is triggered, which increases the discharge power of the energy storage device to increase the voltage. Zone 2 is the low-voltage management process interval, where the low-voltage management strategy continues to increase the discharge power of the energy storage device to increase the voltage. Zone 3 is the ideal effect interval for low-voltage management, where the low-voltage management strategy maintains the discharge power to preserve the voltage. Zone 4 is the low-voltage management transition interval, where the low-voltage management strategy reduces the discharge power to bring the voltage back to Zone 3. Zone 8 is the high-voltage management trigger interval. When the three-phase voltage detection value is in Zone 8, the high-voltage management strategy is triggered, which increases the charging power to decrease the voltage. Zone 7 represents the high-voltage regulation process; the strategy is to continue increasing charging power to reduce voltage. Zone 6 represents the ideal high-voltage regulation effect range; the strategy is to maintain charging power to preserve voltage. Zone 5 represents the high-voltage regulation transition range; the strategy is to reduce charging power to bring the voltage back to Zone 6.

[0089] at the same time, Figure 8The parameters are expressed as follows: The nominal grid voltage (U-rated Voltage) is the single-phase A / B / C voltage value when the grid is operating normally, in units of V, e.g., 230V. Low-voltage management trigger point (fl Low VolStart Point): Percentage (%) of the nominal grid voltage. When the single-phase A / B / C voltage value of the grid falls below this set value, the low-voltage management strategy is triggered. Low-voltage management stop point (fl Low Vol Stop Point): Percentage (%) of the nominal grid voltage. When the single-phase A / B / C voltage value of the grid exceeds this set value, the low-voltage management strategy is gradually terminated. Low-voltage management accuracy (fl Low Vol Accuracy): Percentage (%) of the nominal grid voltage. When the single-phase A / B / C voltage value of the grid is within the range [(fl Low Vol Stop Point - fl Low Vol Accuracy), fl Low Vol Stop Point], the current discharge power of the energy storage device remains unchanged. High-voltage regulation trigger point (fl High Vol Start Point): Percentage (%) of the grid nominal voltage. When the A / B / C single-phase voltage value of the grid exceeds this set value, the high-voltage regulation strategy is triggered. High-voltage regulation stop point (fl High Vol Stop Point): Percentage (%) of the grid nominal voltage. When the A / B / C single-phase voltage value of the grid falls below this set value, the high-voltage regulation strategy gradually ends. High-voltage regulation control accuracy (fl High Vol Accuracy): Percentage (%) of the grid nominal voltage. When the A / B / C single-phase voltage value of the grid is within the range [fl High Vol Stop Point, (fl High Vol Stop Point + fl High Vol Accuracy)], the current charging power of the energy storage device remains unchanged.

[0090] Assuming the parameter settings are as follows: fl Rated Voltage = 230 (V); fl Low Vol Start Point = 90 (%); fl Low Vol Stop Point = 98 (%); fl Low Vol Accuracy = 1 (%); fl High Vol Start Point = 110 (%); fl High Vol Stop Point = 102 (%); fl High Vol If Accuracy = 1 (%) and the nominal voltage of the power grid = 230V, then the interval for zone 1 is [negative infinity, 230 × 90%V]; the interval for zone 2 is [230 × 90%V, 230 × 97%V]; the interval for zone 3 is [230 × 97%V, 230 × 98%V]; the interval for zone 4 is [230 × 98%V, 230V]; the interval for zone 5 is [230V, 230 × 102%V]; the interval for zone 6 is [230 × 102%V, 230 × 103%V]; the interval for zone 7 is [230 × 103%V, 230 × 110%V]; and the interval for zone 8 is [230 × 110%V, positive infinity].

[0091] When the single-phase voltage of the transformer substation is less than or equal to 230 × 90% V, the low-voltage management strategy is triggered. This involves gradually increasing the discharge power of the corresponding single-phase voltage of the energy storage device, causing the voltage to gradually approach zones 2 and 3. When the voltage is in zone 3, it indicates that the energy storage device's power control is reasonable, and the discharge power of the corresponding single-phase voltage remains constant. When the voltage is in zone 4, the discharge power of the energy storage device is gradually reduced, causing the voltage to gradually return to zone 3.

[0092] When the single-phase voltage of the transformer substation exceeds or equals 230 × 110% V, the high-voltage management strategy is triggered. This involves gradually increasing the charging power of the corresponding single-phase voltage of the energy storage device, causing the voltage to gradually approach zones 7 and 6. When the voltage is in zone 6, it indicates that the energy storage device's power control is reasonable, and the charging power of the corresponding single-phase voltage remains constant. When the voltage is in zone 5, the charging power of the corresponding single-phase voltage is gradually reduced, causing the voltage to gradually return to zone 6.

[0093] The third step, as Figure 9 As shown, based on historical data analysis of the area, a 24-hour day is divided into four time periods, named Governance Preparation Zone 1, Governance Zone 1, Governance Preparation Zone 2, and Governance Zone 2. Each Governance Preparation Zone corresponds to a Governance Zone, and more Governance Preparation Zones and Governance Zones can be created based on governance needs. Figure 9In this context, the time periods [T1, T2] and [T3, T4] are the periods most likely to require voltage regulation based on historical data analysis. The purpose of Regulation Preparation Zone 1 and Regulation Preparation Zone 2 is to ensure that the energy storage device has sufficient energy to cope with potential voltage regulation needs during the [T1, T2] or [T3, T4] time periods before the arrival of time T1 or T3. For any given time period, the following three parameters are set: Discharge power of the energy storage device (fl Power): positive numbers represent discharge power, negative numbers represent charging power. Charging stop SOC (fl SocUP): Charging stops when the energy storage device reaches a SOC (State of Charge) equal to fl Soc UP. Discharge stop SOC (fl Soc Down): Discharging stops when the energy storage device reaches a discharge SOC equal to fl Soc Down.

[0094] like Figure 10As shown, the parameters for the [T0, T1] time period are set as follows: T0 = 00:00:00; T1 = 10:00:00; fl Power = 5 (kW, positive discharge); fl Soc UP = 95; fl Soc Down = 5. The parameters for the [T1, T2] time period are set as follows: T1 = 10:00:00; T2 = 15:00:00; fl Power = 0 (kW); fl Soc UP = 95; fl Soc Down = 5. The parameters for the [T2, T3] time period are set as follows: T2 = 15:00:00; T3 = 18:00:00; fl Power = -5 (kW, negative charge); fl Soc UP = 95; fl Soc Down = 5. The parameters for the [T3, T4] time periods are set as follows: T3 = 18:00:00; T4 = 22:00:00; fl Power = 0 (kW); fl Soc UP = 95; fl Soc Down = 5. The parameters for the [T4, T5] time periods are set as follows: T4 = 22:00:00; T5 = 23:59:59; fl Power = 5 (kW, upright); fl Soc UP = 95; fl Soc Down = 5. Among these, [T1, T2] = [10:00:00, 15:00:00] represents the time periods most likely to require high-pressure regulation based on historical data analysis. [T3, T4] = [18:00:00, 22:00:00] represents the time periods most likely to require low-pressure regulation based on historical data analysis. Based on all the parameters set above, between [00:00:00, 10:00:00], the energy storage device will ensure that the SOC value is adjusted to 5, providing sufficient charging margin for possible high-voltage regulation at [10:00:00, 15:00:00]; between [15:00:00, 18:00:00], the energy storage device will ensure that the SOC value is adjusted to 95, providing sufficient discharging margin for possible low-voltage regulation at [18:00:00, 22:00:00].

[0095] If, due to unforeseen circumstances, no high-voltage regulation occurs between [10:00:00, 15:00:00], or if the SOC of the energy storage device falls below 95% after high-voltage regulation, the energy storage device's charge will be compensated between [15:00:00, 18:00:00]. If high-voltage regulation occurs between [10:00:00, 15:00:00], and the SOC of the energy storage device reaches 95% after high-voltage regulation, the energy storage device will no longer be charged between [15:00:00, 18:00:00].

[0096] If, due to unforeseen circumstances, no low-voltage regulation occurs between [18:00:00, 22:00:00], or if the SOC of the energy storage device falls below 5 after low-voltage regulation, then the energy storage device will discharge until its SOC equals 5 between [22:00:00, 23:59:59] and [00:00:00, 10:00:00]. If low-voltage regulation occurs between [18:00:00, 22:00:00], and the SOC of the energy storage device has reached 5 after low-voltage regulation, then the energy storage device will no longer discharge between [22:00:00, 23:59:59] and [00:00:00, 10:00:00].

[0097] Figure 11 A second schematic flowchart of a voltage regulation method for a distribution radio station area according to an embodiment of the present invention is shown; wherein, the voltage regulation method for the distribution radio station area includes:

[0098] Step 1102: Obtain the system time;

[0099] Step 1104: Three-phase voltage detection of the power grid in the transformer substation;

[0100] Step 1106: Voltage determination;

[0101] Step 1108: Determine the single-phase voltage range from zone 1 to zone 8. If the result is zone 1, triggering low-voltage treatment, proceed to step 1110. If the result is normal and no treatment is needed, proceed to step 1112. If the result is zone 8, triggering high-voltage treatment, proceed to step 1114.

[0102] Step 1110: Low voltage treatment (adjust voltage to zone 3);

[0103] Step 1112: Execute the local planning curve;

[0104] Step 1114: High voltage treatment (adjust voltage to zone 6).

[0105] In this embodiment, the voltage regulation method for the distribution substation includes: first, acquiring the current system time value, which can be used for time determination in the local planning curve; then, collecting the three-phase voltage detection values ​​of the substation power grid; and then, based on the collected three-phase voltage detection values, determining the range of a single-phase voltage using the method described in the second step above. If a phase voltage is determined to be in zone 1, the low-voltage management function is triggered, and the control actions from zone 1 to zone 4 described in the second step above are executed. If a phase voltage is determined to be in zone 6, the high-voltage management function is triggered, and the control actions from zone 5 to zone 8 described in the second step above are executed. If none of the three-phase voltage detection values ​​of the substation power grid are determined to be in zone 1 or zone 6, it indicates that the grid voltage is normal and no management is required. At this time, the energy storage device is controlled to charge and discharge according to the local planning curve, i.e., using the method described in the third step above, to prepare conditions for the next voltage management.

[0106] Figure 12 A schematic block diagram of a voltage regulation system for a distribution substation according to an embodiment of the present invention is shown; wherein, the voltage regulation system 120 for the distribution substation includes:

[0107] The first acquisition module 1202 is used to acquire the detected value and first time of the three-phase voltage of the power grid in the distribution area;

[0108] The first matching module 1204 is used to match the detected values ​​of the three-phase voltage with a first voltage range;

[0109] The first processing module 1206 is used to control the charging and discharging of the energy storage device connected to the power grid in the distribution area based on the detected value of the three-phase voltage, the maximum voltage value in the first voltage range, and the minimum voltage value in the first voltage range when the detected value of the three-phase voltage does not match the first voltage range.

[0110] The second processing module 1208 is used to control the charging and discharging of the energy storage device based on the first time and the remaining power of the energy storage device when the detected value of the three-phase voltage matches the first voltage range.

[0111] The voltage regulation system 120 for a distribution substation provided by this invention mainly includes: a first acquisition module 1202, a first matching module 1204, a first processing module 1206, and a second processing module 1208. The first acquisition module 1202 first acquires the detected values ​​of the three-phase voltages of the distribution substation power grid and a first time, where the first time refers to the current time. Subsequently, the first matching module 1204 matches the detected values ​​of the three-phase voltages with a first voltage range, where the first voltage range is determined by the voltage values ​​of the three-phase voltages when the distribution substation power grid is operating normally. When the detected three-phase voltage values ​​do not match the first voltage range (i.e., the detected three-phase voltage values ​​are not within the first voltage range), it indicates an anomaly in the three-phase voltage of the power grid. The first processing module 1206 then controls the charging and discharging of the energy storage device connected to the power grid based on the detected three-phase voltage values, the maximum voltage value within the first voltage range, and the minimum voltage value within the first voltage range. Specifically, when an anomaly occurs in the three-phase voltage, the detected three-phase voltage values ​​are compared with the maximum and minimum voltage values ​​within the first voltage range. If the detected three-phase voltage value is less than the minimum voltage value, it indicates a low-voltage situation in the three-phase power grid. The energy storage device connected to the power grid is then controlled to discharge to compensate for the three-phase voltage and bring it back to normal. If the detected three-phase voltage value is less than the maximum voltage value, it indicates a high-voltage situation in the three-phase power grid. The energy storage device connected to the power grid is then controlled to charge to consume the three-phase voltage and reduce it to normal.

[0112] When the detected three-phase voltage values ​​match the first voltage range (i.e., the detected three-phase voltage values ​​are within the first voltage range), it indicates that the three-phase voltage is normal. The second processing module 1208 then controls the charging and discharging of the energy storage device based on the first time and the remaining power of the energy storage device. It is understandable that due to user habits and distributed photovoltaic access, low or high grid voltage situations are likely to occur during certain specific time periods of the day. Therefore, it is necessary to control the energy storage device to pre-discharge or charge before these specific time periods to ensure that the energy storage device has sufficient power to handle situations where low or high grid voltage occurs. Therefore, when the detected three-phase voltage values ​​match the first voltage range, it can be determined whether the current time is before a period prone to low or high grid voltage. If it is before a period prone to low grid voltage, the energy storage device is charged based on its remaining power to ensure that it has sufficient energy to discharge in the event of low grid voltage. If this occurs before a period when low grid voltage is likely to occur, the energy storage device will be controlled to discharge based on its remaining power to ensure that it has enough energy to recharge when high grid voltage occurs.

[0113] This invention achieves automatic three-phase voltage management in a distribution area without the need for transformer expansion or line modifications, by controlling the energy storage device to perform different functions based on the relationship between the detected, maximum, and minimum three-phase voltage values ​​when the three-phase voltage is abnormal. Simultaneously, when the three-phase voltage is normal, the invention ensures that the energy storage device has sufficient energy to handle situations of low or high grid voltage.

[0114] In some embodiments, optionally, the first matching module 1204 is specifically configured to determine the voltage detection value of each phase of the three-phase voltage based on the detected values ​​of the three-phase voltage; match the voltage detection value of each phase of the three-phase voltage with a first voltage range respectively; determine that the three-phase voltage does not match the first voltage range when the voltage detection value of any one phase of the three-phase voltage does not match the first voltage range; and determine that the three-phase voltage matches the first voltage range when the voltage detection values ​​of all phases of the three-phase voltage match the first voltage range.

[0115] In some embodiments, optionally, the first processing module 1206 is specifically configured to: determine the detected value of the first phase voltage when the detected value of the three-phase voltage does not match the first voltage range, wherein the first phase voltage is the voltage of the phase in the three-phase voltage that does not match the first voltage range; control the first phase of the power grid in the control area to charge the energy storage device when the detected value of the first phase voltage is greater than the maximum voltage value, wherein the first phase corresponds to the first phase voltage; and control the energy storage device to discharge the first phase of the power grid in the control area when the detected value of the first phase voltage is less than the minimum voltage value.

[0116] In some embodiments, optionally, the first processing module 1206 is further configured to increase the charging power of the energy storage device by a first preset step size and obtain a detection value of the first phase voltage; when the detection value of the first phase voltage is less than the maximum voltage value and the detection value of the first phase voltage is greater than the second voltage value, continue to increase the charging power of the energy storage device by a second preset step size, wherein the second preset step size is less than the first preset step size; when the detection value of the first phase voltage is less than the second voltage value and the detection value of the first phase voltage is greater than the third voltage value, maintain the charging power of the energy storage device; when the detection value of the first phase voltage is less than the third voltage value and the detection value of the first phase voltage is greater than the fourth voltage value, decrease the charging power of the energy storage device.

[0117] In some embodiments, optionally, the first processing module 1206 is further configured to increase the discharge power of the energy storage device by a third preset step size and obtain the detection value of the first phase voltage; when the detection value of the first phase voltage is greater than the minimum voltage value and less than the fifth voltage value, continue to increase the discharge power of the energy storage device by a fourth preset step size, wherein the fourth preset step size is less than the third preset step size; when the detection value of the first phase voltage is greater than the fifth voltage value and less than the sixth voltage value, maintain the discharge power of the energy storage device; when the detection value of the first phase voltage is greater than the sixth voltage value and less than the seventh voltage value, decrease the discharge power of the energy storage device.

[0118] In some embodiments, optionally, the second processing module 1208 is specifically used to acquire historical data of the power grid in the distribution area; determine the low-voltage governance preparation time period, low-voltage governance time period, high-voltage governance preparation time period and high-voltage governance time period of the energy storage device based on the historical data; and control the charging and discharging of the energy storage device based on the low-voltage governance preparation time period, low-voltage governance time period, high-voltage governance preparation time period, high-voltage governance time period, first time and the remaining power of the energy storage device.

[0119] Optionally, in some embodiments, the second processing module 1208 is further configured to: control the energy storage device to charge when the first time is within the low-voltage governance preparation period and the remaining power of the energy storage device is less than the first power; control the energy storage device to discharge when the first time is within the high-voltage governance preparation period and the remaining power of the energy storage device is greater than the second power, wherein the first power is greater than the second power; and control the energy storage device not to charge or discharge when the first time is within the high-voltage governance period or the low-voltage governance period.

[0120] Figure 13 A schematic block diagram of an electronic device according to an embodiment of the present invention is shown; wherein, the electronic device 130 includes a memory 1302, a processor 1304, and a computer program stored in the memory 1302 and executable on the processor 1304, wherein the processor 1304 executes the computer program to implement the steps of the voltage regulation method of the distribution station area as described above.

[0121] The electronic device 130 provided by the present invention, when the processor 1304 executes the computer program, implements the steps of the voltage regulation method of the above-mentioned distribution radio area, and can achieve the technical effects of any of the above embodiments, which will not be repeated here.

[0122] One embodiment of the present invention provides a storage medium storing a computer program that, when executed by a processor, implements the steps of the voltage regulation method for a distribution radio station as described above.

[0123] The storage medium provided by the present invention, when the computer program is executed by the processor, implements the steps of the voltage regulation method of the above-described distribution radio area, and can achieve the technical effects of any of the above embodiments, which will not be repeated here.

[0124] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance, unless otherwise expressly specified and limited. The terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can mean a fixed connection, a detachable connection, or an integral connection; it can mean a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0125] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0126] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A voltage regulation method for a distribution radio area, characterized in that, include: Obtain the detected values ​​of the three-phase voltage of the power grid in the distribution area and the first-time data; The detected values ​​of the three-phase voltages are matched with the first voltage range; When the detected value of the three-phase voltage does not match the first voltage range, the energy storage device connected to the power grid of the distribution area is controlled to charge and discharge according to the detected value of the three-phase voltage, the maximum voltage value in the first voltage range, and the minimum voltage value in the first voltage range. When the detected value of the three-phase voltage matches the first voltage range, the energy storage device is controlled to charge and discharge according to the first time and the remaining power of the energy storage device.

2. The voltage regulation method for a distribution radio area according to claim 1, characterized in that, The step of matching the detected values ​​of the three-phase voltages with the first voltage range includes: The voltage detection value of each phase in the three-phase voltage is determined based on the detected values ​​of the three-phase voltage; The voltage detection value of each phase of the three-phase voltage is matched with the first voltage range; When the voltage detection value of any one phase of the three-phase voltage does not match the first voltage range, it is determined that the three-phase voltage does not match the first voltage range. When the voltage detection values ​​of all phases in the three-phase voltage match the first voltage range, it is determined that the three-phase voltage matches the first voltage range.

3. The voltage regulation method for a distribution radio area according to claim 2, characterized in that, The step of controlling the charging and discharging of the energy storage device connected to the power grid based on the detected three-phase voltage values, the maximum voltage value in the first voltage range, and the minimum voltage value in the first voltage range includes: Determine the detected value of the first phase voltage, wherein the first phase voltage is the voltage of the phase among the three phase voltages that does not match the first voltage range; When the detected value of the first phase voltage is greater than the maximum voltage value, the first phase of the distribution grid is controlled to charge the energy storage device, wherein the first phase corresponds to the first phase voltage; When the detected value of the first phase voltage is less than the minimum voltage value, the energy storage device is controlled to discharge the first phase of the power grid in the distribution area.

4. The voltage regulation method for a distribution station area according to claim 3, characterized in that, The step of controlling the first phase of the power grid in the distribution area to charge the energy storage device includes: The charging power of the energy storage device is increased by a first preset step size, and the detection value of the first phase voltage is obtained; When the detected value of the first phase voltage is less than the maximum voltage value and the detected value of the first phase voltage is greater than the second voltage value, the charging power of the energy storage device continues to increase according to the second preset step size, wherein the second preset step size is less than the first preset step size. When the detected value of the first phase voltage is less than the second voltage value and the detected value of the first phase voltage is greater than the third voltage value, the charging power of the energy storage device is maintained. When the detected value of the first phase voltage is less than the third voltage value and the detected value of the first phase voltage is greater than the fourth voltage value, the charging power of the energy storage device is reduced.

5. The voltage regulation method for a distribution radio area according to claim 3, characterized in that, The step of controlling the energy storage device to discharge to the first phase of the power grid includes: The discharge power of the energy storage device is increased by a third preset step size, and the detection value of the first phase voltage is obtained; When the detected value of the first phase voltage is greater than the minimum voltage value and the detected value of the first phase voltage is less than the fifth voltage value, the discharge power of the energy storage device continues to increase according to the fourth preset step size, wherein the fourth preset step size is less than the third preset step size. When the detected value of the first phase voltage is greater than the fifth voltage value and the detected value of the first phase voltage is less than the sixth voltage value, the discharge power of the energy storage device is maintained. When the detected value of the first phase voltage is greater than the sixth voltage value and the detected value of the first phase voltage is less than the seventh voltage value, the discharge power of the energy storage device is reduced.

6. The voltage regulation method for a distribution substation according to any one of claims 1 to 5, characterized in that, The step of controlling the charging and discharging of the energy storage device based on the first time and the remaining power of the energy storage device includes: Obtain historical data of the power grid in the aforementioned distribution area; The low-pressure treatment preparation period, low-pressure treatment period, high-pressure treatment preparation period, and high-pressure treatment period of the energy storage device are determined based on the historical data. The energy storage device is charged and discharged according to the low-voltage treatment preparation period, the high-voltage treatment preparation period, the high-voltage treatment period, the first time, and the remaining power of the energy storage device.

7. The voltage regulation method for a distribution radio area according to claim 6, characterized in that, The step of controlling the charging and discharging of the energy storage device based on the low-voltage governance preparation time period, the low-voltage governance time period, the high-voltage governance preparation time period, the high-voltage governance time period, the first time, and the remaining power of the energy storage device includes: When the first time is within the low-pressure treatment preparation period and the remaining power of the energy storage device is less than the first power, the energy storage device is controlled to charge. When the first time is within the high-voltage governance preparation period and the remaining power of the energy storage device is greater than the second power, the energy storage device is controlled to discharge, wherein the first power is greater than the second power. When the first time period falls within the high-pressure treatment period or the low-pressure treatment period, the energy storage device is controlled not to charge or discharge.

8. A voltage regulation system for a distribution radio area, characterized in that, include: The first acquisition module is used to acquire the detected value and first time of the three-phase voltage of the power grid in the distribution area; The first matching module is used to match the detected value of the three-phase voltage with a first voltage range; The first processing module is used to control the charging and discharging of the energy storage device connected to the power grid area based on the detected value of the three-phase voltage, the maximum voltage value in the first voltage range, and the minimum voltage value in the first voltage range when the detected value of the three-phase voltage does not match the first voltage range. The second processing module is used to control the charging and discharging of the energy storage device based on the first time and the remaining power of the energy storage device when the detected value of the three-phase voltage matches the first voltage range.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the voltage regulation method for the distribution radio area as described in any one of claims 1 to 7.

10. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the voltage regulation method for the distribution radio area as described in any one of claims 1 to 7.

Images