Weak power grid flexible power distribution area power control method and device thereof

Abstract

This application provides a method and apparatus for power control of flexible distribution transformer substations in weak current grids, belonging to the field of power electronics technology. The method includes: acquiring a first output power of a first substation, and determining whether the first output power is within an allowable output power range; if the first output power is not within the allowable output power range, adjusting the first output power so that the first output power is within the allowable output power range. This application can solve the problem of power distribution system downtime caused by excessively long power supply lines in weak current grids.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and more specifically, to a method and apparatus for power control of flexible distribution substations in weak power grids. Background Technology

[0002] With the development of power technology, more and more electrical appliances have entered people's lives, such as televisions and air conditioners. Generally, the power is transmitted to people's homes by the power distribution network to power these appliances so that they can work.

[0003] In related technologies, the distribution network adopts AC power distribution, typically using a closed-loop design and separate operation mode to supply power to each flexible distribution area separately. Generally, in order to control the power of each flexible distribution area, the power flow control coefficient of each distribution area is first calculated based on the average load rate and rated capacity of the distribution transformer in each area. Then, the power flow control command value of each distribution area is calculated based on the power flow control coefficient. Finally, the power flow control active power of the AC (alternating current) / DC (direct current) converter in each distribution area is adjusted according to the power flow control command value to achieve the purpose of controlling the power of each distribution area.

[0004] However, this approach does not take into account the impact of line voltage drop on equipment operation and protection characteristics when flexible distribution zones are interconnected. Therefore, there is a possibility that the AC input voltage overvoltage protection or undervoltage protection may be triggered, which could lead to the shutdown of the entire power distribution system. Summary of the Invention

[0005] The purpose of this application is to provide a method, apparatus, and computer equipment for power control of flexible distribution transformer areas in weak power grids. This method can solve the problem of power distribution system downtime caused by excessively long power supply lines in weak power grids exceeding the normal operating range. Furthermore, it ensures the reliability and practicality of the power control method for flexible distribution transformer areas in weak power grids.

[0006] The embodiments of this application are implemented as follows:

[0007] A first aspect of this application provides a power control method for flexible distribution transformer substations in a weak power grid, applied to a processing device in a flexible substation interconnection system, the method comprising:

[0008] Obtain the first output power of the first unit area and determine whether the first output power is within the allowable output power range;

[0009] If the first output power is not within the allowable output power range, then adjust the first output power so that the first output power is always within the allowable output power range.

[0010] Optionally, the allowable output power range is calculated based on the resistance of the first line, the input voltage of the first energy storage converter corresponding to the first transformer area, the resistance of the second line, and the input voltage of the second energy storage converter corresponding to the second transformer area. The first line is the line between the input terminal of the first energy storage converter and the output terminal of the first transformer, and the second line is the line between the input terminal of the second energy storage converter and the output terminal of the second transformer.

[0011] Optionally, before determining whether the first output power is within the allowable output power range, the method further includes:

[0012] The allowable output power range is obtained based on the resistance value of the first line, the input voltage of the first energy storage converter, the maximum allowable voltage of the first energy storage converter, the minimum allowable voltage of the first energy storage converter, the resistance value of the second line, the input voltage of the second energy storage converter, the maximum allowable voltage of the second energy storage converter, and the minimum allowable voltage of the second energy storage converter.

[0013] Optionally, obtaining the allowable output power range based on the resistance value of the first line, the input voltage of the first energy storage converter, the maximum allowable voltage of the first energy storage converter, the minimum allowable voltage of the first energy storage converter, the resistance value of the second line, the input voltage of the second energy storage converter, the maximum allowable voltage of the second energy storage converter, and the minimum allowable voltage of the second energy storage converter includes:

[0014] The maximum allowable output power of the first transformer substation is determined by the resistance value of the first line, the input voltage of the first energy storage converter, and the maximum allowable voltage of the first energy storage converter. The minimum allowable output power of the first transformer substation is determined by the resistance value of the first line, the input voltage of the first energy storage converter, and the minimum allowable voltage of the first energy storage converter.

[0015] The maximum allowable output power of the second transformer substation is determined by the resistance value of the second line, the input voltage of the second energy storage converter, and the maximum allowable voltage of the second energy storage converter; the minimum allowable output power of the second transformer substation is determined by the resistance value of the second line, the input voltage of the second energy storage converter, and the minimum allowable voltage of the second energy storage converter.

[0016] The maximum value between the minimum allowable output power of the first transformer area and the minimum allowable output power of the second transformer area is taken as the minimum value of the allowable output power range, and the minimum value between the maximum allowable output power of the first transformer area and the maximum allowable output power of the second transformer area is taken as the maximum value of the allowable output power range.

[0017] Optionally, adjusting the first output power includes:

[0018] If the first output power is greater than the maximum value of the allowed output power range, then the first output power is adjusted to a first target power that is less than or equal to the maximum value of the allowed output power range;

[0019] If the first output power is less than the minimum value of the allowable output power range, then the first output power is adjusted to a second target power that is greater than or equal to the minimum value of the allowable output power range.

[0020] Optionally, the method further includes:

[0021] The resistance value of the first line is determined based on the line length, cross-sectional area, and conductor resistivity of the first line.

[0022] The impedance value of the second line is determined based on the line length, cross-sectional area, and conductor resistivity of the second line.

[0023] Optionally, after obtaining the first output power of the first unit area and determining whether the first output power is within the allowable output power range, the method further includes:

[0024] If the first output power is within the allowable output power range, then the first output power is used as the actual output power control value of the first station area.

[0025] Optionally, the maximum allowable voltage of the first energy storage converter is 1.2 times the rated voltage of the first energy storage converter, and the minimum allowable voltage of the first energy storage converter is 0.75 times the rated voltage of the first energy storage converter.

[0026] The maximum allowable voltage of the second energy storage converter is 1.2 times the rated voltage of the second energy storage converter, and the minimum allowable voltage of the second energy storage converter is 0.75 times the rated voltage of the second energy storage converter.

[0027] A second aspect of this application provides a power control device for flexible distribution transformer substations in a weak power grid, applied to a flexible substation interconnection system, the device comprising:

[0028] The acquisition module is used to acquire the first output power of the first unit area and determine whether the first output power is within the allowable output power range.

[0029] The determining module is used to adjust the first output power when the first output power is not within the allowable output power range, so that the first output power is always within the allowable output power range.

[0030] A third aspect of this application provides a flexible distribution substation interconnection system, the flexible distribution substation interconnection system including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the power control method for flexible distribution substations in a weak power grid as described in the first aspect.

[0031] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the power control method for flexible distribution substations in a weak power grid as described in the first aspect.

[0032] The beneficial effects of the embodiments of this application include:

[0033] This application provides a method for power control of a flexible distribution transformer area in a weak power grid. The method obtains the first output power of the first transformer area and determines whether the first output power is within the allowable output power range. If the first output power is not within the allowable output power range, the method adjusts the first output power so that the first output power is within the allowable output power range.

[0034] By acquiring the first output power of the first transformer substation and determining whether it falls within the allowable output power range—which is calculated based on the resistance, voltage, resistance, and voltage of the first and second lines—the problem of the impact of line voltage drop on equipment operation and protection characteristics in the case of interconnected flexible transformer substations can be solved. Furthermore, by adjusting the first output power when it is not within the allowable range, ensuring it falls within that range, the first transformer substation, including the constant power source, will not trigger the AC input voltage overvoltage or undervoltage protection in the flexible transformer substation interconnection system, thus ensuring its normal operation. This solves the problem of power distribution system downtime caused by excessively long power supply lines in weak current grids exceeding the normal operating range. Additionally, it ensures the accuracy, reliability, and practicality of the power control method for flexible distribution substations in weak current grids. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of the flexible distribution transformer interconnection system provided in the embodiments of this application;

[0037] Figure 2 A flowchart illustrating the first type of power control method for flexible distribution substations in a weak power grid provided in this application embodiment;

[0038] Figure 3 A flowchart illustrating the second type of power control method for flexible distribution substations in weak power grids provided in this application embodiment;

[0039] Figure 4 A flowchart illustrating the third type of flexible distribution substation power control method for weak grids provided in this application embodiment;

[0040] Figure 5 A flowchart of the fourth type of flexible distribution substation power control method for weak grids provided in the embodiments of this application;

[0041] Figure 6 A schematic diagram of the structure of a flexible distribution substation power control device for a weak power grid provided in this application embodiment;

[0042] Figure 7 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0045] In related technologies, power distribution networks using AC distribution typically employ a closed-loop design and separate operation to supply power to each flexible distribution area. Generally, to control the power of each flexible distribution area, the power flow control coefficient for each area is calculated based on the average load rate and rated capacity of the distribution transformers. Then, the power flow control command value for each area is calculated based on the power flow control coefficient. Finally, the active power of the AC / DC converters in each area is adjusted according to the power flow control command value to achieve the goal of controlling the power of each area. However, this approach does not consider the impact of line voltage drop on the equipment operation and protection characteristics when flexible distribution areas are interconnected. Therefore, there is a possibility of triggering AC input voltage overvoltage or undervoltage protection, leading to the shutdown of the entire power distribution system. Furthermore, this approach does not consider the impact of large-scale voltage variations in weak grids on equipment uptime, making it difficult to guarantee the reliability of the power distribution system.

[0046] To address this issue, this application provides a power control method for flexible distribution transformer substations in weak current grids. The method involves acquiring the first output power of the substation and determining whether the first output power falls within the allowable output power range. If the first output power is not within the allowable range, the method adjusts the first output power to ensure it falls within the allowable range. This method can solve the problem of power distribution system downtime caused by excessively long power supply lines in weak current grids.

[0047] This application uses a power control method for flexible distribution substations in a weak power grid, applied in a power distribution system, as an example for illustration. However, it does not imply that this application's embodiments can only be applied to power control of flexible distribution substations in weak power grids within a power distribution system.

[0048] Figure 1 This is a schematic diagram of a flexible distribution transformer interconnection system provided in an embodiment of this application. Figure 1 As shown in the illustration, this application uses a power distribution system corresponding to a first transformer substation and a second transformer substation as an example for explanation. However, this does not mean that the power control method for flexible distribution substations in a weak grid provided in this application can only be applied to a flexible interconnected distribution system corresponding to a first transformer substation and a second transformer substation.

[0049] This flexible distribution transformer interconnection system corresponds to at least two distribution transformer areas. See Figure 1 The power distribution system corresponds to a first transformer substation A1 and a second transformer substation A2. The system includes a processing device B, a first converter C1, a second converter C2, and multiple voltage detection devices. The power distribution system can also be a system that interconnects the AC sides of the first transformer substation A1 and the second transformer substation A2 via two back-to-back AC / DC converters.

[0050] The first converter C1 corresponds to the first transformer area A1, and the second converter C2 corresponds to the second transformer area A2.

[0051] The first distribution area A1 includes the first transformer T1 and multiple circuit breakers.

[0052] The input terminal of the first transformer T1 is connected to the power grid through circuit breaker QS1.

[0053] The output terminal of the first transformer T1 is connected to the first terminal of the circuit breaker QS3 via the circuit breaker QS2. The second terminal of the circuit breaker QS3 is connected to the first terminal of the first converter C1. The second terminal of the first converter C1 is connected to the second transformer substation A2 via the circuit breaker QS4.

[0054] The output terminal of the first transformer T1 is also connected to the first terminals of circuit breakers QS5, QS6, QS7 and QS8 respectively via circuit breaker QS2. The second terminals of circuit breakers QS5, QS6, QS7 and QS8 are respectively used to connect to the load.

[0055] The output terminal of the first transformer T1 is also connected to the processing equipment B through the voltage detection device V1.

[0056] The first terminal of the first converter C1 is also connected to the processing device B via the voltage detection device V2.

[0057] The second distribution area A2 includes the second transformer T2 and multiple circuit breakers.

[0058] The input terminal of the second transformer T2 is connected to the power grid via circuit breaker QS9.

[0059] The output terminal of the second transformer T2 is connected to the first terminal of the circuit breaker QS11 via the circuit breaker QS10. The second terminal of the circuit breaker QS11 is connected to the first terminal of the second converter C2. The second terminal of the second converter C2 is connected to the first transformer substation A1 via the circuit breaker QS12.

[0060] The output terminal of the second transformer T2 is also connected to the first terminals of circuit breakers QS13, QS14, QS15 and QS16 respectively via circuit breaker QS10. The second terminals of circuit breakers QS13, QS14, QS15 and QS16 are respectively used to connect to the load.

[0061] The output terminal of the second transformer T2 is also connected to the processing equipment B via the voltage detection device V4.

[0062] The first terminal of the second converter C2 is also connected to the processing device B via the voltage detection device V3.

[0063] Optionally, if the load of the first transformer zone A1 is large, that is, if the reverse power of the first transformer zone A1 is large, then in order to achieve load balancing between the first transformer T1 in the first transformer zone A1 and the second transformer T2 in the second transformer zone A2, it is necessary to control the output power of the second transformer zone A2 to flow to the first transformer zone A1. In other words, the first transformer zone A1 increases its power, and the second transformer zone A2 decreases its power. Then, the power output of the first converter C1 is positive power, and the power output of the second converter C2 is negative power. Conversely, if the load of the second transformer zone A2 is large, that is, if the reverse power of the second transformer zone A2 is large, then in order to achieve load balancing, it is necessary to flow the output power of the first transformer zone A1 to the second transformer zone A2. In other words, the first transformer zone A1 decreases its power, and the second transformer zone A2 increases its power. Then, the power output of the first converter C1 is negative power, and the power output of the second converter C2 is positive power. This embodiment of the application does not limit this.

[0064] Optionally, the power grid can be a 10kV power grid, a 100kV power grid, or a power grid of other voltage levels. This application does not limit this.

[0065] Optionally, the first transformer T1 and the second transformer T2 can be step-down transformers used to reduce the voltage of the power grid to 220V or other voltage levels.

[0066] Optionally, a circuit breaker refers to a switching device capable of closing, carrying, and interrupting current under normal circuit conditions and capable of closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. Naturally, the circuit breaker in the power distribution system provided in this application can also be replaced by other switching devices capable of performing a closing function. This application does not limit this.

[0067] Optionally, the first converter C1 and the second converter C2 can be electrical devices that convert the electrical energy output from the first transformer T1 and the second transformer T2 into AC / DC power. Specifically, both the first converter C1 and the second converter C2 can be power conversion systems (PCS). The PCS includes an AC / DC converter and a control unit. The PCS can receive control commands from the processing device B via communication and can charge, discharge, and regulate the active and reactive power of the power grid using dual closed-loop control and / or pulse modulation methods according to the control commands, thereby improving the dynamic performance of the system and achieving current-limiting protection or power-limiting protection. This application does not limit this aspect.

[0068] Optionally, the PCS can also be connected to an energy storage battery and a load. The PCS can be used to control the power grid to charge the energy storage battery, or to control the energy storage battery to discharge in order to supply power to the load connected to the PCS. This application does not limit this aspect.

[0069] Optionally, the energy storage battery can be a battery or battery pack of any voltage level, or a battery or battery pack of a voltage level compatible with the PCS. This application does not limit this aspect.

[0070] Optionally, the first converter C1 can be a device that has the function of charging the energy storage battery with constant AC power and controlling the energy storage battery with constant AC power discharge, i.e., an AC constant power source, so as to achieve the purpose of stabilizing AC power.

[0071] Optionally, the second converter C2 can be a device that has the function of charging the energy storage battery with DC constant voltage and controlling the discharge of the energy storage battery with DC constant voltage, i.e., a DC constant voltage source, so as to achieve the purpose of stabilizing the DC bus voltage.

[0072] In order to achieve load balancing between the first distribution area A1 and the second distribution area A2, one of the first converters C1 and the second converter C2 needs to output positive power and the other converter needs to output negative power. The output power of the first converter C1 and the second converter C2 can refer to the power transferred between the first distribution area A1 and the second distribution area A2. In the embodiments of this application, controlling the power of the flexible distribution area of ​​the weak grid can refer to controlling the output power of the constant power source, that is, controlling the output power of the first converter C1.

[0073] Optionally, such as Figure 1 As shown, in the first transformer area A1, if the operating power of the first converter C1 increases, the input voltage of the first converter C1 can gradually increase. Conversely, in the second transformer area A2, if the operating power of the second converter C2 increases, the input voltage of the second converter C2 can gradually decrease. This application does not limit this aspect.

[0074] Optionally, the output terminal of the first transformer T1 can also be provided with more outgoing terminals through circuit breaker QS2, which can be used as backup outgoing terminals and connected to other loads. These terminals can also serve as backup outgoing terminals for loads connected to circuit breakers QS5, QS6, QS7, and QS8 in case of failure or power outage for maintenance, ensuring uninterrupted power supply to these loads. The number of outgoing terminals from the output terminal of the first transformer T1 through circuit breaker QS2 can be set according to actual conditions. This application embodiment does not limit this.

[0075] Alternatively, the load can be any possible electrical device.

[0076] Optionally, voltage detection device V1 is used to detect the voltage at the output terminal of the first transformer T1, and voltage detection device V2 is used to detect the voltage at the first terminal of the first converter C1.

[0077] Optionally, the processing device B can calculate or determine the voltage drop between the output terminal of the first transformer T1 and the first terminal of the first converter C1 based on the voltage detected by the voltage detection devices V1 and V2, and then determine the voltage on the line between the output terminal of the first transformer T1 and the first terminal of the first converter C1.

[0078] Optionally, voltage detection device V3 is used to detect the voltage at the output terminal of the second transformer T2, and voltage detection device V4 is used to detect the voltage at the first terminal of the second converter C2.

[0079] Optionally, the processing device B can calculate or determine the voltage drop between the output terminal of the second transformer T2 and the first terminal of the second converter C2 based on the voltage detected by the voltage detection devices V3 and V4, and then determine the voltage on the line between the output terminal of the second transformer T2 and the first terminal of the second converter C2.

[0080] Optionally, processing device B can be a microcontroller unit (MCU). Alternatively, processing device B can also be a processing device installed in the interconnection controller between the two transformer substations, or a processing device installed in the first converter C1 and / or the second converter C2, such as a power storage converter monitoring unit (PSCU) installed in the first converter C1 and / or the second converter C2. This application embodiment does not limit this. Specifically, processing device B can be used to determine / calculate parameters such as voltage, power, and impedance (resistance value) in the first transformer substation A1 and the second transformer substation A2. Processing device B can also be used to adjust the output power and / or voltage of the first transformer substation A1 and the second transformer substation A2. This application embodiment does not limit this.

[0081] The following is a detailed explanation of the power control method for flexible distribution substations in weak power grids provided in the embodiments of this application.

[0082] Figure 2 This application provides a flowchart of a power control method for flexible distribution transformer substations in a weak power grid. This method can be applied to processing equipment in a flexible substation interconnection system, which can be the aforementioned flexible substation interconnection distribution system, and the processing equipment can be the aforementioned processing equipment B. See also... Figure 2 This application provides a method for power control of flexible distribution transformer substations in weak power grids, including:

[0083] Step 1001: Obtain the first output power of the first substation and determine whether the first output power is within the allowable output power range.

[0084] Optionally, the first station area can be the first station area A1 mentioned above.

[0085] Optionally, the first output power can be the output power of the first energy storage converter, or it can be used to indicate the output power of the first distribution area. The first energy storage converter can be the first converter C1 mentioned above. That is, the first energy storage converter can be used as the AC constant power source of the flexible distribution area interconnection power distribution system. Then the final output power value of the flexible distribution area interconnection power distribution system can be the first output power.

[0086] The first output power can be the power output by the flexible distribution network interconnection system according to the load, or the power that the flexible distribution network interconnection system needs to output as set by relevant technicians or users, or the power actually output by the flexible distribution network interconnection system.

[0087] Optionally, the first output power may be the dispatch power output from the first distribution area to the second distribution area.

[0088] For example, when the power of the first station area is increased and the power of the second station area is decreased, the first output power can be positive power, while when the power of the first station area is decreased and the power of the second station area is increased, the first output power can be negative power.

[0089] Optionally, the allowable output power range can be calculated based on the resistance of the first line, the input voltage of the first energy storage converter, the resistance of the second line, and the input voltage of the second energy storage converter.

[0090] Optionally, the first line is the line between the input terminal of the first energy storage converter and the output terminal of the first transformer.

[0091] Optionally, the second line is the line between the input terminal of the second energy storage converter and the output terminal of the second transformer.

[0092] The first energy storage converter can be the first converter C1 mentioned above, and the first transformer can be the first transformer T1 mentioned above. The second energy storage converter can be the second converter C2 mentioned above, and the second transformer can be the second transformer T2 mentioned above.

[0093] It is worth noting that since the allowable output power range is calculated based on the resistance of the first line, the input voltage of the first energy storage converter, the resistance of the second line, and the input voltage of the second energy storage converter, determining whether the first output power is within the allowable output power range facilitates subsequent operations and solves the problem of the impact of line voltage drop on equipment operation protection characteristics when interconnecting various flexible distribution areas. This also ensures the accuracy, reliability, and practicality of the method.

[0094] Step 1002: If the first output power is not within the allowable output power range, adjust the first output power so that the first output power is within the allowable output power range.

[0095] Optionally, the first output power not being within the allowable output power range may mean that the first output power is greater than the maximum value of the allowable output power range or that the first output power is less than the minimum value of the allowable output power range.

[0096] It is worth noting that since the first output power is the output power of the first energy storage converter, and the first energy storage converter can be used as an AC constant power source, the first output power can be used as the final output power value of the flexible distribution transformer interconnection system. If the first output power is not within the allowable output power range, the first output power can be adjusted to make it within the allowable output power range. In this way, it can be ensured that the actual output power of the first distribution transformer will not trigger the overvoltage protection or undervoltage protection of the first distribution transformer or the flexible distribution transformer interconnection system.

[0097] This can solve the problem of power distribution system downtime caused by excessively long power supply lines in weak power grids exceeding the normal operating range.

[0098] In this embodiment of the application, the first output power of the first station area is obtained, and it is determined whether the first output power is within the allowable output power range. If the first output power is not within the allowable output power range, the first output power is adjusted so that the first output power is within the allowable output power range.

[0099] By acquiring the first output power of the first transformer substation and determining whether it falls within the allowable output power range—which is calculated based on the resistance, voltage, resistance, and voltage of the first and second lines—the problem of the impact of line voltage drop on equipment operation and protection characteristics in the case of interconnected flexible transformer substations can be solved. Furthermore, by adjusting the first output power when it is not within the allowable range, ensuring it falls within that range, the first transformer substation, including the constant power source, will not trigger the AC input voltage overvoltage or undervoltage protection in the flexible transformer substation interconnection system, thus ensuring its normal operation. This solves the problem of power distribution system downtime caused by excessively long power supply lines in weak current grids exceeding the normal operating range. Additionally, it ensures the accuracy, reliability, and practicality of the power control method for flexible distribution substations in weak current grids.

[0100] In one possible approach, the method may further include:

[0101] Obtain the second output power of the second transformer area.

[0102] Optionally, the second output power can be the output power of the second energy storage converter, or it can be used to indicate the output power of the second distribution area. The second energy storage converter can be the second converter C2 mentioned above, that is, the second energy storage converter can be used as the DC constant voltage source of the flexible distribution area interconnection power distribution system.

[0103] For example, when the power of the first station area is increased and the power of the second station area is decreased, the second output power can be negative power, while when the power of the first station area is decreased and the power of the second station area is increased, the second output power can be positive power.

[0104] The first output power and the second output power can be obtained directly through the corresponding power detection equipment, and this application embodiment does not limit this.

[0105] One possible method for determining the first voltage of the first line based on the input voltage of the first energy storage converter and the output voltage of the first transformer includes:

[0106] The difference between the output voltage of the first transformer and the input voltage of the first energy storage converter is determined as the first voltage.

[0107] It is worth noting that, due to, as Figure 1As shown, in order to achieve load balancing between the first transformer in the first distribution area and the second transformer in the second distribution area, it is necessary to control the output power of the second distribution area to flow to the first distribution area. That is, the power output of the first converter is positive power, so the voltage drop on the first converter is in the same direction as the current. In this way, the voltage drop on the first line can be accurately calculated, that is, the value of the first voltage can be calculated.

[0108] One possible method for determining the second voltage of the second line based on the input voltage of the second energy storage converter and the output voltage of the second transformer in the second distribution area includes:

[0109] The difference between the input voltage of the second energy storage converter and the output voltage of the second transformer is determined as the second voltage.

[0110] It is worth noting that, due to, as Figure 1 As shown, to achieve load balancing between the first transformer in the first distribution area and the second transformer in the second distribution area, it is necessary to control the output power of the second distribution area to flow to the first distribution area. In other words, the power output of the second converter is negative power, so the voltage drop on the second converter is in the opposite direction to the current. In this way, the voltage drop on the second line can be accurately calculated, that is, the value of the second voltage can be calculated.

[0111] In one possible implementation, see [link to relevant documentation]. Figure 3 Before determining whether the first output power is within the permissible output power range, the method further includes:

[0112] Step 1003: Based on the resistance value of the first line, the input voltage of the first energy storage converter, the maximum allowable voltage of the first energy storage converter, the minimum allowable voltage of the first energy storage converter, the resistance value of the second line, the input voltage of the second energy storage converter, the maximum allowable voltage of the second energy storage converter, and the minimum allowable voltage of the second energy storage converter, the allowable output power range is obtained.

[0113] In this way, the allowable output power range can be accurately determined, which can solve the problem of the impact of line voltage drop on the equipment operation and protection characteristics when the interconnection of various flexible distribution areas is not considered.

[0114] In one possible implementation, see [link to relevant documentation]. Figure 4 Based on the resistance value of the first line, the input voltage of the first energy storage converter, the maximum allowable voltage of the first energy storage converter, the minimum allowable voltage of the first energy storage converter, the resistance value of the second line, the input voltage of the second energy storage converter, the maximum allowable voltage of the second energy storage converter, and the minimum allowable voltage of the second energy storage converter, the allowable output power range is obtained, including:

[0115] Step 1004: Determine the maximum allowable output power of the first transformer area by using the resistance value of the first line, the input voltage of the first energy storage converter, and the maximum allowable voltage of the first energy storage converter; and determine the minimum allowable output power of the first transformer area by using the resistance value of the first line, the input voltage of the first energy storage converter, and the minimum allowable voltage of the first energy storage converter.

[0116] Optionally, the maximum permissible voltage of the first energy storage converter can be preset. Generally, the maximum permissible voltage of the first energy storage converter can be set to 1.2 times its rated voltage. Alternatively, the maximum permissible voltage of the first energy storage converter can be set according to the voltage value that triggers the overvoltage protection of the first transformer area. For example, if the minimum voltage value that triggers the overvoltage protection of the first transformer area is 10V, then the maximum permissible voltage of the first energy storage converter can be set to 9.9V. Of course, it can also be set to other possible voltage values. This application does not limit this.

[0117] Optionally, the maximum permissible output power of the first transformer substation may refer to the maximum power that the first transformer substation can output to the load, the maximum power that the first converter can output, or the maximum output power that will not trigger the overvoltage protection of the first transformer substation. This application embodiment does not limit this.

[0118] Optionally, the minimum allowable voltage of the first energy storage converter can be preset. Generally, the minimum allowable voltage of the first energy storage converter can be set to 0.75 times its rated voltage. Alternatively, the minimum allowable voltage of the first energy storage converter can be set according to the voltage value that triggers the undervoltage protection of the first transformer area. For example, if the maximum voltage value that triggers the undervoltage protection of the first transformer area is 5V, then the minimum allowable voltage of the first energy storage converter can be set to 5.1V. Of course, it can also be set to other possible voltage values. This application does not limit this.

[0119] Optionally, the minimum allowable output power of the first transformer substation may refer to the minimum power that the first transformer substation can output to the load, the minimum power that the first converter can output, or the minimum output power that will not trigger the undervoltage protection of the first transformer substation. This application embodiment does not limit this.

[0120] In this way, the maximum and minimum allowable output power of the first transformer area can be accurately determined, that is, the allowable output power range of the first transformer area can be determined, which facilitates subsequent operations.

[0121] Step 1005: Determine the maximum allowable output power of the second transformer area by using the resistance value of the second line, the input voltage of the second energy storage converter, and the maximum allowable voltage of the second energy storage converter; and determine the minimum allowable output power of the second transformer area by using the resistance value of the second line, the input voltage of the second energy storage converter, and the minimum allowable voltage of the second energy storage converter.

[0122] Optionally, the maximum permissible voltage of the second energy storage converter can be preset. Generally, the maximum permissible voltage of the second energy storage converter can be set to 1.2 times the rated voltage of the first energy storage converter. Alternatively, the maximum permissible voltage of the second energy storage converter can be set according to the voltage value that triggers the overvoltage protection of the second transformer area. For example, if the minimum voltage value that triggers the overvoltage protection of the second transformer area is 20V, then the maximum permissible voltage of the second energy storage converter can be set to 19V. Of course, it can also be set to other possible voltage values. This application does not limit this.

[0123] Optionally, the maximum permissible output power of the second transformer substation may refer to the maximum power that the second transformer substation can output to the load, the maximum power that the second converter can output, or the maximum output power that will not trigger the overvoltage protection of the second transformer substation. This application does not limit this specific power.

[0124] Optionally, the minimum allowable voltage of the second energy storage converter can be preset. Generally, the minimum allowable voltage of the second energy storage converter can be set to 0.75 times its rated voltage. Alternatively, the minimum allowable voltage of the second energy storage converter can be set according to the voltage value that triggers the undervoltage protection of the second transformer area. For example, if the maximum voltage value that triggers the undervoltage protection of the second transformer area is 10V, then the minimum allowable voltage of the second energy storage converter can be set to 9V. Of course, it can also be set to other possible voltage values. This application does not limit this.

[0125] Optionally, the minimum allowable output power of the second transformer substation may refer to the minimum power that the second transformer substation can output to the load, the minimum power that the second converter can output, or the minimum output power that will not trigger the undervoltage protection of the second transformer substation. This application embodiment does not limit this.

[0126] In this way, the maximum and minimum allowable output power of the second transformer area can be accurately determined, that is, the allowable output power range of the second transformer area can be determined, which facilitates subsequent operations.

[0127] Step 1006: Take the maximum value of the minimum allowable output power of the first station area and the minimum allowable output power of the second station area as the minimum value of the allowable output power range, and take the minimum value of the maximum allowable output power of the first station area and the maximum allowable output power of the second station area as the maximum value of the allowable output power range.

[0128] Optionally, the operation of taking the maximum value of the minimum allowable output power of the first substation area and the minimum allowable output power of the second substation area as the minimum value of the allowable output power range can be specifically as follows: compare the minimum allowable output power of the first substation area and the minimum allowable output power of the second substation area, and select the larger of the minimum allowable output power of the first substation area and the minimum allowable output power of the second substation area as the minimum value of the allowable output power range.

[0129] Furthermore, if the minimum allowable output power of the first station area is equal to the minimum allowable output power of the second station area, then either the minimum allowable output power of the first station area or the minimum allowable output power of the second station area can be used as the minimum value of the allowable output power range.

[0130] Optionally, the operation of taking the minimum value between the maximum allowable output power of the first substation and the maximum allowable output power of the second substation as the maximum value of the allowable output power range can be specifically as follows: compare the maximum allowable output power of the first substation and the maximum allowable output power of the second substation, and select the smaller of the maximum allowable output power of the first substation and the maximum allowable output power of the second substation as the maximum value of the allowable output power range.

[0131] Furthermore, if the maximum allowable output power of the first transformer area and the maximum allowable output power of the second transformer area are equal, then either the maximum allowable output power of the first transformer area or the maximum allowable output power of the second transformer area can be used as the maximum value of the allowable output power range.

[0132] It is worth noting that if the minimum of the maximum allowable output power of the first substation area and the maximum allowable output power of the second substation area is less than the maximum of the minimum allowable output power of the first substation area and the minimum allowable output power of the second substation area, that is, if the maximum value of the determined allowable output power range is less than the minimum value of the determined allowable output power range, then it can be characterized that the power flow direction of the first substation area and the second substation area is incorrect.

[0133] In this situation, a prompt message can be generated to alert relevant technicians that the power flow direction of the first and second substations is incorrect. This message can be displayed on a screen connected to the system or sent to the corresponding terminal device or server so that relevant technicians can adjust the relevant parameters of the system in a timely manner.

[0134] For example, since load balancing is required between the first and second transformer substations, the first converter in the first substation may output positive or negative power depending on actual needs; that is, the first output power may be positive or negative. Similarly, the second converter in the second substation may also output positive or negative power depending on actual needs; that is, the second output power may be positive or negative. In this case, the maximum value between the negative power output by the first converter in the first substation and the negative power output by the second converter in the second substation can be taken as the minimum value of the allowable output power range, while the minimum value between the positive power output by the first converter in the first substation and the positive power output by the second converter in the second substation can be taken as the maximum value of the allowable output power range.

[0135] For example, the maximum possible negative power of the first output power and the maximum possible negative power of the second output power can be compared, and the smaller absolute value of the maximum negative power of the first output power and the maximum possible negative power of the second output power can be taken as the minimum value of the allowable output power range. Similarly, the maximum possible positive power of the first output power and the maximum possible positive power of the second output power can be compared, and the smaller absolute value of the maximum possible negative power of the first output power and the maximum possible negative power of the second output power can be taken as the maximum value of the allowable output power range.

[0136] For example, the maximum possible negative power of the first output power is -100W (watts), and the maximum possible negative power of the second output power is -80W. Since the absolute value of -80W is less than the absolute value of -100W, the maximum possible negative power of the second output power can be taken as the minimum value of the allowable output power range. Similarly, the maximum possible positive power of the first output power is 100W (watts), and the maximum possible positive power of the second output power is 200W. Since the absolute value of 100W is less than the absolute value of 200W, the maximum possible positive power of the first output power can be taken as the maximum value of the allowable output power range. The embodiments described herein are merely illustrative and do not represent that the power control method for flexible distribution transformer substations in weak power grids provided in this application can only calculate the allowable output power range in this manner.

[0137] By calculating the allowable output power range in this way, the first output power, the resistance of the first line, the first line, the second output power, the resistance of the second line, and the voltage drop on the second line can be correlated. This allows for accurate determination of the allowable output power range, enabling better control of the output power of the first and second transformer substations, as well as the final output power of the flexible transformer substation interconnection system. Furthermore, any errors in determining the allowable output power range can be promptly communicated to relevant technical personnel. This resolves the issue of neglecting to consider the impact of line voltage drops on equipment operation and protection characteristics in flexible transformer substation interconnection scenarios, thereby ensuring the accuracy, reliability, and practicality of the method.

[0138] In one possible implementation, see [link to relevant documentation]. Figure 5 After acquiring the first output power of the first substation and determining whether the first output power is within the allowable output power range, the method further includes:

[0139] Step 1007: If the first output power is within the allowable output power range, then the first output power is used as the actual output power control value of the first station area.

[0140] Optionally, the actual output power control value of the first unit area can be a reference value for the processing device B to control the output power of the first unit area. In other words, the actual output power control value of the first unit area can be the actual output power of the first unit area.

[0141] Furthermore, since the first energy storage converter in the first transformer substation is an AC constant power source, the actual output power control value of the first transformer substation can also be used as the final output target control value of the flexible transformer substation interconnection power distribution system. This application does not limit this aspect.

[0142] Furthermore, if both the first output power and the second output power are within the permissible output power range, it indicates that the AC input voltage overvoltage protection or undervoltage protection in the flexible transformer interconnection system will not be triggered. In other words, the fact that both the first output power and the second output power are within the permissible output power range indicates that both the first transformer area and the second transformer area can operate normally.

[0143] It is worth noting that by determining that both the first and second output powers are within the allowable output power range, and using these first and second output powers as the actual output power control values ​​for the first and second transformer substations respectively, it can be ensured that neither the first nor the second transformer substation will trigger the AC input voltage overvoltage or undervoltage protection in the flexible transformer substation interconnection system. This ensures that both the first and second transformer substations can operate normally, thus guaranteeing the reliability and practicality of the method.

[0144] In one possible implementation, adjusting the first output power includes:

[0145] If the first output power is greater than the maximum value of the allowable output power range, then the first output power is adjusted to a first target power that is less than or equal to the maximum value of the allowable output power range.

[0146] If the first output power is less than the minimum value of the allowable output power range, then the first output power is adjusted to a second target power that is greater than or equal to the minimum value of the allowable output power range.

[0147] Optionally, the first target power and the second target power may be set in advance by relevant technical personnel, or they may be calculated by the aforementioned processing equipment based on the current actual parameters of the flexible transformer interconnection system. This application embodiment does not limit this.

[0148] Optionally, the value of the first target power is less than or equal to the maximum value of the allowable output power range, and the value of the first target power is greater than or equal to the minimum value of the allowable output power range.

[0149] Generally, the difference between the first target power and the maximum value of the allowable output power range will not be too large. The purpose of adjusting the first output power to the first target power is to leave a certain power margin.

[0150] For example, the first target power can be set to 99%, 95%, 90% or other possible values ​​of the maximum value of the allowable output power range, and this application embodiment does not limit this.

[0151] Optionally, the value of the second target power is greater than or equal to the minimum value of the allowable output power range, and the value of the second target power is less than or equal to the minimum value of the allowable output power range.

[0152] Generally, the difference between the second target power and the minimum value of the allowable output power range will not be too large. The purpose of adjusting the first output power to the second target power is to leave a certain power margin.

[0153] For example, the second target power can be set to 1.01 times, 1.05 times, 1.1 times or other possible values ​​of the minimum value of the allowable output power range, and the embodiments of this application do not limit this.

[0154] In one possible approach, adjusting the first output power may further include:

[0155] If the first output power is less than the minimum value of the allowable output power range, then the first output power is adjusted to the minimum value of the allowable output power range.

[0156] Optionally, if the first output power is not within the allowable output power range, the first output power can also be adaptively adjusted according to other possible rules. This application does not limit this aspect.

[0157] It is worth noting that by adjusting the first output power differently under various circumstances, it can be ensured that the actual output power of the first transformer substation is within the allowable output power range. This also ensures that the actual output power of the first transformer substation will not trigger the overvoltage or undervoltage protection of the flexible transformer substation interconnection system. This solves the problem of the power distribution system operating beyond its normal operating range due to excessively long power supply lines in weak current grids, which could lead to system shutdown. Furthermore, adjusting the first output power to either the first target power or the second target power provides a certain power margin for the power distribution system. This avoids the power distribution system operating at the critical state of the allowable output power range for extended periods, thereby improving the stability and safety of the power distribution system.

[0158] In one possible implementation, the method may further include:

[0159] The resistance value of the first line is determined based on the line length, cross-sectional area, and conductor resistivity.

[0160] For example, if the length of the first line is L1, the cross-sectional area of ​​the first line is S1, and the resistivity of the conductor of the first line is ρ1, then the resistance value R1 of the first line can be calculated according to the line impedance calculation formula R=ρ·L / S.

[0161] For example, assuming the first circuit is made of copper, then the resistivity ρ1 of the conductor of the first circuit is 1.75 × 10^(-8) ohm-meters (Ω·m), the length L1 of the first circuit is 1000 meters (m), and the cross-sectional area S1 of the first circuit is 0.000001 square meters (m²). 2 Therefore, according to R=ρ·L / S, the resistance R1 of the first circuit can be calculated as 1.75×10^(-8)×1000 / 0.000001=17.5Ω.

[0162] The impedance value of the second line is determined based on the line length, cross-sectional area, and conductor resistivity.

[0163] For example, if the length of the second line is L2, the cross-sectional area of ​​the second line is S2, and the conductor resistivity of the second line is ρ2, then the resistance of the second line can be calculated according to the line impedance calculation formula R=ρ·L / S.

[0164] For example, assuming the second line is made of aluminum, then the conductor resistivity ρ2 of the second line is 2.83 × 10^(-8) ohm-meters (Ω·m), the line length L2 is 2000 meters (m), and the cross-sectional area of ​​the second line is S2, which is 0.000001 square meters (m²). Then, according to R = ρ·L / S, the resistance R2 of the second line can be calculated as 2.83 × 10^(-8) × 2000 / 0.000001 = 56.6 Ω.

[0165] In this way, the resistance values ​​of the first and second lines can be accurately calculated, thus ensuring the accuracy and practicality of the method.

[0166] In one possible implementation, the method may further include:

[0167] If the first output power is greater than or equal to the minimum value of the allowable output power range and less than or equal to the maximum value of the allowable output power range, then the first output power is determined to be within the allowable output power range.

[0168] This allows for accurate determination of whether the first output power falls within the permissible output power range, enabling precise execution of different operations for varying situations. This ensures the reliability and practicality of the method.

[0169] In one possible implementation, if the first output power is within the allowable output power range, then the first output power is used as the actual output power control value for the first transformer area, specifically including:

[0170] If the first output power is within the allowable output power range, then the first output power can be used as the actual output power control value of the first station area.

[0171] In this way, the actual output power control value of each unit can be accurately determined, thus ensuring the accuracy and practicality of the method.

[0172] To ensure that the actual power output of the second transformer substation does not trigger the overvoltage or undervoltage protection of the second substation or the flexible transformer substation interconnection system, this application embodiment also provides a possible approach. The method further includes:

[0173] Obtain the second output power of the second station area and determine whether the second output power is within the allowable output power range.

[0174] If the second output power is not within the allowable output power range, then adjust the second output power so that the second output power is always within the allowable output power range.

[0175] If the second output power is not within the allowable output power range, adjusting the second output power to bring it within the allowable range ensures that the actual output power of the second transformer substation will not trigger the overvoltage or undervoltage protection of the second substation or the flexible transformer substation interconnection distribution system. This solves the problem of distribution system downtime caused by excessively long power supply lines in weak current grids exceeding the normal operating power range.

[0176] One possible way to adjust the second output power includes:

[0177] If the second output power is greater than the maximum value of the allowable output power range, then the second output power is adjusted to a third target power that is less than or equal to the maximum value of the allowable output power range.

[0178] If the second output power is less than the minimum value of the allowable output power range, then the second output power is adjusted to a fourth target power that is greater than or equal to the minimum value of the allowable output power range.

[0179] Optionally, the third target power and the fourth target power may be equal to the values ​​of the first target power and the second target power, respectively. This application embodiment does not limit this.

[0180] Optionally, the value of the third target power is less than or equal to the maximum value of the allowable output power range, and the value of the third target power is greater than or equal to the minimum value of the allowable output power range. The value of the fourth target power is greater than or equal to the minimum value of the allowable output power range, and the value of the fourth target power is less than or equal to the minimum value of the allowable output power range.

[0181] In one possible approach, adjusting the second output power may also include:

[0182] If the second output power is greater than the maximum value of the allowable output power range, then the second output power is adjusted to the maximum value of the allowable output power range.

[0183] It is worth noting that by adjusting the second output power differently under various circumstances, it can be ensured that the actual output power of the second transformer substation is within the allowable output power range. This also ensures that the actual output power of the second transformer substation will not trigger the overvoltage or undervoltage protection of the flexible transformer substation interconnection system. Furthermore, adjusting the second output power to the third or fourth target power can provide a certain power margin for the power distribution system. This avoids the power distribution system operating at the critical state of the allowable output power range for extended periods, thereby improving the stability and safety of the power distribution system.

[0184] One possible approach is to obtain the second output power of the second substation area and determine whether the second output power is within the allowable output power range, the method further includes:

[0185] If the second output power is within the allowable output power range, then the second output power is used as the actual output power control value of the second station area.

[0186] The following describes the apparatus, equipment, and computer-readable storage medium used to implement the flexible distribution transformer area power control method for weak power grids provided in this application. The specific implementation process and technical effects are described above and will not be repeated below.

[0187] Figure 6 This is a schematic diagram of the structure of a power control device for a flexible distribution transformer area in a weak power grid, provided in an embodiment of this application. It is applied to a flexible distribution transformer interconnection system. (See also...) Figure 6 The device includes:

[0188] The acquisition module 201 can be used to acquire the first output power of the first station area and determine whether the first output power is within the allowable output power range.

[0189] Optionally, the allowable output power range can be calculated based on the resistance of the first line, the input voltage of the first energy storage converter, the resistance of the second line, and the input voltage of the second energy storage converter.

[0190] The determining module 202 can be used to adjust the first output power when the first output power is not within the allowable output power range, so that the first output power is always within the allowable output power range.

[0191] The above-described device is used to execute the method provided in the foregoing embodiments, and its implementation principle and technical effect are similar, so they will not be described again here.

[0192] These modules can be one or more integrated circuits configured to implement the above methods, such as one or more Application Specific Integrated Circuits (ASICs), one or more microcontrollers, or one or more Field Programmable Gate Arrays (FPGAs). Alternatively, when a module is implemented using processing element scheduler code, the processing element can be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. Furthermore, these modules can be integrated together as a system-on-a-chip (SOC).

[0193] Figure 7 This is a schematic diagram of a flexible distribution transformer interconnection system provided in an embodiment of this application. See also... Figure 7 The flexible distribution system includes a memory 301 and a processor 302. The memory 301 stores a computer program that can run on the processor 302. When the processor 302 executes the computer program, it implements the steps in any of the above method embodiments.

[0194] Optionally, the flexible distribution system may further include at least one converter and an interconnection control device. The steps in any of the above method embodiments can be implemented by executing a computer program through either the converter or the interconnection control device, or by cooperating with both the converter and the interconnection control device to execute the computer program. This application does not limit this approach.

[0195] Optionally, the converter may include the first converter and the second converter described above.

[0196] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, can implement the steps in the various method embodiments described above.

[0197] Optionally, this application also provides a program product, such as a computer-readable storage medium, including a program that, when executed by a processor, is used to perform any of the above-described embodiments of the flexible distribution substation power control method for weak power grids.

[0198] In the several embodiments provided by this invention, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0199] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0200] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0201] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute partial steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0202] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0203] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for power control of flexible distribution transformer substations in weak power grids, characterized in that, A processing device applied to a flexible distribution transformer interconnection system, wherein the flexible distribution transformer interconnection system includes at least two distribution transformer areas, the first distribution transformer area includes a first transformer and a first energy storage converter, and the second distribution transformer area includes a second transformer and a second energy storage converter; the method includes: Obtain the first output power of the first unit area and determine whether the first output power is within the allowable output power range; If the first output power is not within the allowable output power range, then adjust the first output power so that the first output power is within the allowable output power range; The process of determining whether the first output power is within the allowable output power range includes: The maximum allowable output power of the first transformer substation is determined by the resistance value of the first line, the input voltage of the first energy storage converter, and the maximum allowable voltage of the first energy storage converter. The minimum allowable output power of the first transformer substation is determined by the resistance value of the first line, the input voltage of the first energy storage converter, and the minimum allowable voltage of the first energy storage converter. The first line is the line between the input terminal of the first energy storage converter and the output terminal of the first transformer. The maximum allowable output power of the second transformer area is determined by the resistance value of the second line, the input voltage of the second energy storage converter, and the maximum allowable voltage of the second energy storage converter. The minimum allowable output power of the second transformer area is determined by the resistance value of the second line, the input voltage of the second energy storage converter, and the minimum allowable voltage of the second energy storage converter. The second line is the line between the input terminal of the second energy storage converter and the output terminal of the second transformer. The maximum value between the minimum allowable output power of the first transformer area and the minimum allowable output power of the second transformer area is taken as the minimum value of the allowable output power range, and the minimum value between the maximum allowable output power of the first transformer area and the maximum allowable output power of the second transformer area is taken as the maximum value of the allowable output power range.

2. The method for power control of flexible distribution transformer substations in weak power grids as described in claim 1, characterized in that, Adjusting the first output power includes: If the first output power is greater than the maximum value of the allowed output power range, then the first output power is adjusted to a first target power that is less than or equal to the maximum value of the allowed output power range; If the first output power is less than the minimum value of the allowable output power range, then the first output power is adjusted to a second target power that is greater than or equal to the minimum value of the allowable output power range.

3. The method for power control of flexible distribution transformer substations in weak power grids as described in claim 1, characterized in that, The method further includes: The resistance value of the first line is determined based on the line length, cross-sectional area, and conductor resistivity of the first line. The resistance value of the second line is determined based on the line length, cross-sectional area, and conductor resistivity of the second line.

4. The method for power control of flexible distribution transformer substations in weak power grids as described in any one of claims 1-3, characterized in that, After acquiring the first output power of the first unit area and determining whether the first output power is within the allowable output power range, the method further includes: If the first output power is within the allowable output power range, then the first output power is used as the actual output power control value of the first station area.

5. A power control device for a flexible distribution transformer area in a weak power grid, used to implement the power control method for a flexible distribution transformer area in a weak power grid as described in any one of claims 1-4, characterized in that, The device, applied to a flexible transformer interconnection system, includes: The acquisition module is used to acquire the first output power of the first unit area and determine whether the first output power is within the allowable output power range. The determining module is configured to adjust the first output power so that the first output power is within the allowable output power range when the first output power is not within the allowable output power range.

6. A flexible distribution system for interconnected transformer substations, characterized in that, include: A memory and a processor, wherein the memory stores a computer program that can run on the processor, and when the processor executes the computer program, it implements the steps of the method described in any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 1 to 4.

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