Multi-zone-area flexible interconnection device and method with distributed resource management and control capability

Abstract

The invention belongs to the field of power systems, and particularly discloses a multi-zone-area flexible interconnection device and method with distributed resource management and control capability, and the device comprises a main circuit module, an energy storage module, a communication module and a coordination control terminal. The main circuit module comprises a DC bus, a plurality of VSC converters, a DC / DC converter and a DC capacitor used for stabilizing the voltage of the DC bus. The coordination control terminal, each current converter, the power distribution network main station and the distributed power supply of each power distribution area are in communication connection with the communication module; and the coordination control terminal is used for receiving a scheduling instruction issued by the power distribution network master station, and controlling the output of the distributed power supply in the power distribution area based on the total difference of the active power of the power loss area and the output margin of the distributed power supply in response to the scheduling instruction under the condition that the power loss area appears. According to the invention, the method can achieve the flexible management and control of the distributed resources in the power distribution area, and supports the continuous power supply of a power-losing load under the condition of power-losing of a power grid fault.

Description

Technical Field

[0001] The present application belongs to the field of power systems, and more specifically, to a multi-station flexible interconnection device and method with distributed resource management and control capabilities. Background Art

[0002] In recent years, distributed photovoltaic and energy storage have been connected to the distribution system on a large scale, becoming an important part of the new distribution system. There are great uncertainties on both the load side and the power supply side of the distribution network, and the difficulty of balancing the source-load power and energy has increased. Some distribution networks are facing the problems of insufficient power supply capacity in different zones and low power supply recovery level after faults. Flexible interconnection of multiple distribution stations is a new technical method applied to the access of large-scale distributed resources (power sources). By deploying flexible interconnection devices between stations, energy mutual assistance and resource sharing between different stations can be flexibly realized, and the adaptability of the stations to the access of large-scale distributed resources can be improved.

[0003] However, the flexible interconnection system of multiple distribution substations still has the following problems: (1) It is difficult for a large number of distributed resources such as photovoltaics and energy storage to respond to the main distribution network station and is difficult to manage; (2) Due to the lack of control over distributed resources, the potential of backup power supply of distributed resources in the event of a power grid failure is yet to be explored. How to achieve flexible control over distributed resources in distribution substations and support continuous power supply to the power-lost load in the event of a power grid failure is a technical problem that needs to be solved in this field. Summary of the invention

[0004] In view of the defects of the prior art, the purpose of this application is to achieve flexible control of distributed resources in the distribution station area and support continuous power supply to the power-lost load in the event of a power grid failure.

[0005] To achieve the above-mentioned purpose, in a first aspect, the present application provides a multi-station flexible interconnection device with distributed resource management and control capabilities, the device comprising: a main circuit module, an energy storage module, a communication module and a coordination control terminal; The main circuit module includes a DC bus, multiple VSC converters, a DC / DC converter, and a DC capacitor for stabilizing the DC bus voltage; The DC capacitor and the DC side of the VSC converter are connected to the DC bus, the AC side of the VSC converter is connected to the AC feeder of the corresponding distribution station area, one DC side of the DC / DC converter is connected to the DC bus, and the other DC side of the DC / DC converter is connected to the energy storage module, which is used to maintain the stability of the DC bus voltage; Coordinate the communication connection of the control terminal, each converter, the distribution network master station and the distributed power sources in each distribution station area to the communication module; The coordination control terminal is used to receive the dispatching instructions issued by the distribution network master station through the communication module, and respond to the dispatching instructions to control the output of the distributed power sources in each distribution station area through the communication module; The coordination control terminal is also used to determine the total active power difference in the lost station area and the output margin of the distributed power sources in each distribution station area when a lost station area occurs, and to control the output of the distributed power sources in the distribution station area based on the total active power difference in the lost station area and the output margin of the distributed power sources.

[0006] In a possible implementation manner, the coordination control terminal is specifically used for (the above-mentioned determination of the total active power difference in the radio station loss area specifically includes) determining the total active power difference by the following formula: ; in, Indicates the number of the lost station area. is the total active power difference required in the radio-lost area (active power difference command value), is the frequency at the grid connection point in the lost radio area collected by the sensor, is the rated frequency of the lost station area, is the proportional coefficient of active power control, is the integral coefficient of active power control, represents the Laplace operator.

[0007] In a possible implementation, the coordination control terminal is specifically used for (the above-mentioned determination of the output margin of the distributed power source in each distribution station area specifically includes) determining the output margin by the following formula: ; ; in, Indicates In the distribution area The output margin of the energy storage converter of a distributed power source, Indicates In the distribution area The rated capacity of the energy storage converter of a distributed power source is and Respectively represent In the distribution area The actual active power and reactive power values ​​of the energy storage converters of the distributed power sources, Indicates In the distribution area The output margin of the photovoltaic inverter of a distributed power source, Indicates In the distribution area The maximum output value of the photovoltaic inverter of a distributed power source, and Respectively represent In the distribution area The actual active power value and reactive power value of the photovoltaic inverter of each distributed power source.

[0008] In a possible implementation, the coordination control terminal is specifically used for (controlling the output of the distributed power source in the distribution station area based on the total active power difference in the lost station area and the output margin of the distributed power source, including): Based on the output margin of distributed power in each distribution area, determine the total output margin of distributed power in each distribution area and the sum of the output margin of distributed power in all distribution areas. ; Total distributed generation output margin in the power outage area Greater than or equal to the total active power difference in the lost station area In the case of power outage, control the output of distributed power sources in the area where the power is out of service; Or, the total difference in active power in the area where the station is lost Greater than the total distributed generation output margin in the power outage area , and the total active power difference in the lost station area Less than the sum of the output margins of distributed power sources in all distribution areas Under the circumstances, control the output of distributed power sources in each distribution station area; Or, the total difference in active power in the area where the station is lost Greater than or equal to the sum of the output margins of distributed power sources in all distribution areas In the case of a power outage, part of the load in the power outage area is removed until the total active power difference in the power outage area is met. Less than the sum of the output margins of distributed power sources in all distribution areas ; The sum of the output margins of distributed power sources in all distribution areas Determined by the following formula: ; in, Indicates the number of the lost station area. Indicates The total distributed power output margin of each distribution station area, Indicates the number of distribution station areas.

[0009] In a possible implementation, the coordination control terminal is specifically used for (the above-mentioned determination of the total distributed power output margin of each distribution substation based on the output margin of the distributed power in each distribution substation area specifically includes) determining the total distributed power output margin of the corresponding distribution substation area by the following formula: ; in, Indicates The number of distributed power sources in each distribution area, Indicates In the distribution area The output margin of the photovoltaic inverter of a distributed power source, Indicates In the distribution area The output margin of the energy storage converter of a distributed power source.

[0010] In a possible implementation, the total distributed generation output margin in the power outage area Greater than or equal to the total active power difference in the lost station area In the case of a power outage, the coordination control terminal is specifically used for (the above-mentioned control of the output of the distributed power source in the power outage area, including) determining the output of the distributed power source in the power outage area by the following formula: ; in, , Indicates that the coordination control terminal sends In the distribution area The power command value issued by the photovoltaic inverter of each distributed power source, Indicates In the distribution area The output margin of the photovoltaic inverter of a distributed power source, Indicates In the distribution area The actual value of the active power of the photovoltaic inverter of each distributed power source, Indicates that the coordination control terminal sends In the distribution area The power command value issued by the energy storage converter of each distributed power source, Indicates In the distribution area The output margin of the energy storage converter of a distributed power source, Indicates In the distribution area The actual value of the active power of the energy storage converter of a distributed power source.

[0011] In one possible implementation, the total active power difference in the lost station area is Greater than the total distributed generation output margin in the power outage area , and the total active power difference in the lost station area Less than the sum of the output margins of distributed power sources in all distribution areas In the case of, the coordination control terminal is specifically used for (the above-mentioned control of the output of distributed power sources in each distribution substation area, including) determining the output of distributed power sources in each distribution substation area through the following formula: ; in, Indicates that the coordination control terminal sends In the distribution area The power command value issued by the photovoltaic inverter of each distributed power source, Indicates In the distribution area The output margin of the photovoltaic inverter of a distributed power source, Indicates In the distribution area The actual value of the active power of the photovoltaic inverter of each distributed power source, Indicates that the coordination control terminal sends In the distribution area The power command value issued by the energy storage converter of each distributed power source, Indicates In the distribution area The output margin of the energy storage converter of a distributed power source, Indicates In the distribution area The actual value of the active power of the energy storage converter of a distributed power source.

[0012] In a possible implementation, the coordinated control terminal is further used to determine the power command corresponding to each VSC converter by using the following formula: ; ; ; ; in, Indicates that the coordination control terminal sends The power command issued by each VSC converter, , Indicates the number of the distribution station area where no power failure occurs. Indicates The number of distributed power sources in each distribution area, Indicates Rated capacity of each VSC converter.

[0013] In a second aspect, the present application provides a coordinated control method, applied to the device described in the first aspect or any possible implementation manner of the first aspect, the method comprising: Receive the dispatching instructions issued by the distribution network master station through the communication module, and respond to the dispatching instructions to control the output of distributed power sources in each distribution station area through the communication module; In the event of a lost power area, the total active power difference in the lost power area and the output margin of the distributed power sources in each distribution area are determined, and based on the total active power difference in the lost power area and the output margin of the distributed power sources, the output of the distributed power sources in the distribution area is controlled.

[0014] In a possible implementation, the output of the distributed power source in the distribution area is controlled based on the total active power difference in the lost station area and the output margin of the distributed power source, including: Based on the output margin of distributed power in each distribution area, determine the total output margin of distributed power in each distribution area and the sum of the output margin of distributed power in all distribution areas. ; Total distributed generation output margin in the power outage area Greater than or equal to the total active power difference in the lost station area In the case of power outage, control the output of distributed power sources in the area where the power is out of service; Or, the total active power difference in the lost station area Greater than the total distributed generation output margin in the power outage area , and the total active power difference in the lost station area Less than the sum of the output margins of distributed power sources in all distribution areas Under the circumstances, control the output of distributed power sources in each distribution station area; Or, the total active power difference in the lost station area Greater than or equal to the sum of the output margins of distributed power sources in all distribution areas In the case of a power outage, part of the load in the power outage area is removed until the total active power difference in the power outage area is met. Less than the sum of the output margins of distributed power sources in all distribution areas ; The sum of the output margins of distributed power sources in all distribution areas Determined by the following formula: ; in, Indicates the number of the lost station area. Indicates The total distributed power output margin of each distribution station area, Indicates the number of distribution station areas.

[0015] In general, the above technical solutions conceived by this application have the following beneficial effects compared with the prior art: (1) By installing a coordination control terminal inside the flexible interconnected equipment, it can respond to the main station of the distribution network upward and manage multiple distributed power sources connected to the interconnected substation downward. The output of multiple distributed power sources can be controlled through the communication module, thereby improving the management efficiency of distributed resources in the distribution network and realizing flexible control of distributed resources in the distribution substation area.

[0016] (2) In the event of a power outage due to a power grid failure (when a power distribution area is lost), the coordinated control terminal can automatically determine the total active power difference in the power distribution area based on the collected voltage and current, as well as the output margin of the distributed power sources in each distribution area, calculate the power dispatching instructions required for the interconnected areas, and then distribute power based on the output margin of each distributed power source and send it to the distributed power sources in the area for execution. This fully utilizes the backup power supply characteristics of the distributed power sources, supports the continuous power supply of the loads in the power distribution area, and improves the operational reliability of the flexible interconnected distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall structural diagram of a multi-distribution station area flexible interconnection device provided in an embodiment of the present application; Figure 2 is a control structure diagram of a VSC converter provided in an embodiment of the present application; Figure 3 is a control structure diagram of a DC / DC converter provided in an embodiment of the present application; Figure 4 It is a grid voltage waveform diagram constructed by a flexible interconnection device of multiple distribution stations after a sudden failure of distribution station area 1 provided in an embodiment of the present application; Figure 5 It is a grid frequency waveform diagram constructed by a flexible interconnection device of multiple distribution stations after a sudden failure of distribution station area 1 provided in an embodiment of the present application; Figure 6 It is an output power waveform diagram of distributed photovoltaic and energy storage in distribution area 1 under the coordinated control of the flexible interconnection device of multiple distribution areas after a sudden failure of distribution area 1 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0020] In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more than two. For example, multiple processing units refer to two or more processing units, etc.; multiple elements refer to two or more elements, etc.

[0021] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0022] (1) Flexible interconnected device structure with distributed resource management capabilities: The overall structure of the flexible interconnection device with distributed resource management capabilities is as follows: Figure 1 As shown. It mainly includes a main circuit module, an energy storage module, a communication module and a coordinated control terminal. Among them, the main circuit module contains 2 VSCs (Voltage Source Converters), 1 DC / DC (DC-DC) converter, a DC capacitor for stabilizing the DC bus voltage and multiple electrical sensors. The DC sides of the three converters are connected to the same 750V DC bus, and the AC sides of the VSC converters are respectively connected to the AC feeders of two distribution stations (station area 1 and station area 2). The energy storage module is connected to the DC bus through a DC / DC converter. On the one hand, the communication module can establish a two-way communication connection between the coordinated control terminal and the main station of the distribution network, and on the other hand, it can realize the two-way information interaction between the coordinated control terminal and multiple distributed photovoltaics and energy storage connected to stations 1 and 2. In addition, the communication module is also used to realize the communication connection between the coordinated control terminal and the three converters. The coordinated control terminal is the control layer of the flexible interconnected device. On the one hand, it receives dispatching instructions from the main station of the distribution network. On the other hand, it can spontaneously determine the operating mode of the equipment through the electrical information collected by multiple sensors (one is the operating mode when there is no fault and power outage, and the other is the operating mode when a fault and power outage occur). It also calculates the power dispatching instructions required by the substation based on the collected voltage and current, and sends them to the distributed resources in each substation for execution through the communication module.

[0023] The above-mentioned flexible interconnection device can be expanded to flexible interconnection and distributed resource management and control of more distribution station sections by increasing the number of VSC converters connected to the DC bus according to actual operation needs.

[0024] (2) Overall control structure of equipment: (2-1) VSC converter control strategy: like Figure 2 As shown in the figure, the VSC converter adopts the classic virtual synchronous generator control and has the ability to connect to the grid and independently build a microgrid. Its active and reactive power control can be expressed as: (1); in, is the fictitious inertia coefficient; is the damping coefficient; is the internal potential rotation angular frequency of the VSC converter; is the rated angular frequency; It is the potential phase angle inside the VSC converter output by the active power control link; It is the potential amplitude inside the VSC converter output by the reactive power control link; It is the integral coefficient of the reactive power control link; , They are the active power and reactive power reference command values ​​issued by the coordinated control terminal to the VSC converter; , They are respectively the active power and reactive power actually output by the VSC converter; represents the Laplace operator.

[0025] (2-2) Energy storage DC / DC converter control: The energy storage module is connected to the DC bus of the equipment through a DC / DC converter, such as Figure 3 As shown, constant DC voltage control is used to maintain the stability of the DC bus voltage of the equipment. The DC / DC converter adopts voltage outer loop-current inner loop control: (2); (3); in, and They are the rated value and actual value of the DC voltage of the device; It is the inner loop current reference value output by the voltage outer loop; and The proportional and integral coefficients of the outer loop control respectively; is the actual value of the current flowing through the inductor of the DC / DC converter; is the duty cycle of the DC / DC converter; and The proportional and integral coefficients of the inner loop control respectively; represents the Laplace operator.

[0026] (3) Distributed resource management strategy: First, based on the electrical operation information collected by the flexible interconnection device, when the coordinated control terminal monitors the substation ( ) When the voltage or frequency decreases at the grid connection point (under normal circumstances, the voltage and frequency should be within the corresponding preset range), it is judged that the substation The side grid fails and loses power. At this time, the coordination control terminal calculates the substation area The total active power difference is: (4); in, For Taiwan The required active power difference command value; Area collected by the sensor Frequency at the grid connection point; For distribution area Rated frequency; and The proportional and integral coefficients of active power control respectively.

[0027] Then, the coordination control terminal calculates the photovoltaic and energy storage output power based on the transmission of the communication module. Output margin of each distributed power source in an interconnected area and the output margin of distributed photovoltaics : (5); (6); in, For Taiwan ( ) indivual( ) Output margin of energy storage converter; For Taiwan Middle Rated capacity of each energy storage converter; and Taiwan Middle The actual value of the current output active power and reactive power of each energy storage converter; For Taiwan Middle Output margin of each photovoltaic inverter; For Taiwan Middle The maximum output value of each photovoltaic inverter; and Taiwan Middle The actual value of active power and reactive power currently output by each photovoltaic inverter.

[0028] Next, the total distributed power output margin from area 1 to area m is obtained : (7); in, Indicates The number of distributed power sources in a distribution station area.

[0029] In order to give full play to the backup power function of distributed power sources, the coordinated control terminal sends power instructions to distributed power sources in multiple interconnected areas to support the power loss load based on the power difference calculated by formula (4) and formula (7) and the output margin of distributed power sources in each area. Taking the flexible interconnection device containing two VSC converters as an example, the distributed resource control strategy is as follows: (3-1) ; At this time, the radio station area The internal distributed power output margin is greater than the required active power difference, that is, the continuous power supply of the power failure load can be supported by only increasing the output of the internal distributed power supply in the substation. The power command value of each distributed power source in the system is sent to the substation through the communication module. The distributed power sources within the system issue power instructions.

[0030] (8); in, , To coordinate the control terminal to the station area Middle The power command value issued by each photovoltaic inverter; For Taiwan Middle The actual value of the active power currently output by each photovoltaic inverter; To coordinate the control terminal to the station area Middle The power command value issued by each energy storage converter; For Taiwan Middle The actual value of the active power currently output by the energy storage converter.

[0031] (3-2) ; At this time, the radio station area The internal distributed power output margin is less than the required active power difference, and the distributed power output in the two areas needs to be increased to support the continuous power supply of the power failure load. The coordination control terminal calculates the power command value of each distributed power source in area 1 and area 2 respectively, and sends the command through the communication module.

[0032] (9); in, ( ).

[0033] Considering the internal power balance constraints of the equipment, the power instructions issued by the coordinated control terminal to the two VSC converters must meet the following requirements: (10); in, , They are power instructions issued by the coordinated control terminal to the VSC1 and VSC2 converters, with the flow toward the AC grid as the positive direction.

[0034] Assume that the lost station area is station area 1, that is, Since the power transmitted between interconnected stations needs to be transmitted through the flexible interconnection device, the power command issued by the coordinated control terminal to the distributed power source in station area 2 must also meet the capacity constraint of the VSC2 converter: (11); in, is the rated capacity of the VSC2 converter.

[0035] Similarly, the power command sent by the coordinated control terminal to area 1 also needs to meet the converter capacity constraint: (12); in, is the rated capacity of the VSC1 converter.

[0036] (3-3) ; At this time, the radio station area The power shortage in the area is greater than the power that can be generated by all distributed power sources in area 1 and area 2. Partial load within until the , and then according to the above The control method in this case ensures the power support of important loads in the substation.

[0037] When the equipment contains 3 or more VSC converters to achieve multi-terminal area interconnection, the above control ideas are still valid. It is only necessary to distribute the total active power difference according to the ratio of the output margin of the distributed power sources in multiple areas and meet the capacity constraints of multiple converters and the power balance constraints within the equipment.

[0038] This application is in Figure 1 The proposed scheme was verified in the system shown in the figure. After the unplanned power outage of feeder 1, the flexible interconnection device of multiple distribution substations coordinated the distributed photovoltaic and energy storage in feeder 1 to jointly build and maintain the frequency and voltage process diagram of feeder 1. At 2s, a sudden fault occurred in distribution substation 1, resulting in an unplanned power outage in the distribution substation. At the moment of the fault transient, the flexible interconnection device of multiple distribution substations provided fast frequency and voltage support, see Figure 4 , Figure 5 After that, the coordination control terminal of the device quickly calculates the power required by feeder 1 and issues power adjustment instructions to the distributed power converter in feeder 1 according to the power margin of the distributed resources connected to feeder 1 and feeder 2, so as to give full play to the backup power supply capacity of distributed resources and realize independent networking operation of the substation. The output power waveform of distributed photovoltaic and energy storage in substation 1 is as follows: Figure 6 shown.

[0039] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A multi-zone flexible interconnection device with distributed resource management and control capabilities, characterized in that: include: Main circuit module, energy storage module, communication module and coordination control terminal; The main circuit module includes a DC bus, multiple VSC converters, a DC / DC converter, and a DC capacitor for stabilizing the DC bus voltage; The DC capacitor and the DC side of the VSC converter are connected to the DC bus, the AC side of the VSC converter is connected to the AC feeder of the corresponding distribution station area, one DC side of the DC / DC converter is connected to the DC bus, and the other DC side of the DC / DC converter is connected to the energy storage module, which is used to maintain the stability of the DC bus voltage; Coordinate the communication connection of the control terminal, each converter, the distribution network master station and the distributed power sources in each distribution station area to the communication module; The coordination control terminal is used to receive the dispatching instructions issued by the distribution network master station through the communication module, and respond to the dispatching instructions to control the output of the distributed power sources in each distribution station area through the communication module; The coordination control terminal is also used to determine the total active power difference in the lost station area and the output margin of the distributed power sources in each distribution station area when a lost station area occurs, and to control the output of the distributed power sources in the distribution station area based on the total active power difference in the lost station area and the output margin of the distributed power sources.

2. The multi-zone flexible interconnection device with distributed resource management and control capability according to claim 1, characterized in that: The coordination control terminal is specifically used to determine the total active power difference through the following formula: ； in, Indicates the number of the lost station area. is the total difference in active power required in the area where the radio station was lost, is the frequency at the grid connection point in the lost radio area collected by the sensor, is the rated frequency of the lost station area, is the proportional coefficient of active power control, is the integral coefficient of active power control, represents the Laplace operator.

3. The multi-zone flexible interconnection device with distributed resource management and control capability according to claim 1, characterized in that: The coordinated control terminal is specifically used to determine the output margin through the following formula: ； ； in, Indicates In the distribution area The output margin of the energy storage converter of a distributed power source, Indicates In the distribution area The rated capacity of the energy storage converter of a distributed power source is and Respectively represent In the distribution area The actual active power and reactive power values ​​of the energy storage converters of the distributed power sources, Indicates In the distribution area The output margin of the photovoltaic inverter of a distributed power source, Indicates In the distribution area The maximum output value of the photovoltaic inverter of a distributed power source, and Respectively represent In the distribution area The actual active power value and reactive power value of the photovoltaic inverter of each distributed power source.

4. The multi-zone flexible interconnection device with distributed resource management and control capability according to claim 1, characterized in that: The coordination control terminal is specifically used for: Based on the output margin of distributed power in each distribution area, determine the total output margin of distributed power in each distribution area and the sum of the output margin of distributed power in all distribution areas. ; Total distributed generation output margin in the power outage area Greater than or equal to the total active power difference in the lost station area In the case of power outage, control the output of distributed power sources in the area where the power is out of service; Or, the total difference in active power in the area where the station is lost Greater than the total distributed generation output margin in the power outage area , and the total active power difference in the lost station area Less than the sum of the output margins of distributed power sources in all distribution areas Under the circumstances, control the output of distributed power sources in each distribution station area; Or, the total difference in active power in the area where the station is lost Greater than or equal to the sum of the output margins of distributed power sources in all distribution areas In the case of a power outage, part of the load in the power outage area is removed until the total active power difference in the power outage area is met. Less than the sum of the output margins of distributed power sources in all distribution areas ; The sum of the output margins of distributed power sources in all distribution areas Determined by the following formula: ； in, Indicates the number of the lost station area. Indicates The total distributed power output margin of each distribution station area, Indicates the number of distribution station areas.

5. The multi-zone flexible interconnection device with distributed resource management and control capability according to claim 4, characterized in that: The coordination control terminal is specifically used to determine the total distributed power output margin of the corresponding distribution station area through the following formula: ； in, Indicates The number of distributed power sources in each distribution area, Indicates In the distribution area The output margin of the photovoltaic inverter of a distributed power source, Indicates In the distribution area The output margin of the energy storage converter of a distributed power source.

6. The multi-zone flexible interconnection device with distributed resource management and control capability according to claim 4, characterized in that: Total distributed generation output margin in the power outage area Greater than or equal to the total active power difference in the lost station area In the case of a power outage, the coordinated control terminal is specifically used to determine the output of the distributed generation in the power outage area through the following formula: ； in, , Indicates that the coordination control terminal sends In the distribution area The power command value issued by the photovoltaic inverter of each distributed power source, Indicates In the distribution area The output margin of the photovoltaic inverter of a distributed power source, Indicates In the distribution area The actual value of the active power of the photovoltaic inverter of each distributed power source, Indicates that the coordination control terminal sends In the distribution area The power command value issued by the energy storage converter of each distributed power source, Indicates In the distribution area The output margin of the energy storage converter of a distributed power source, Indicates In the distribution area The actual value of the active power of the energy storage converter of a distributed power source.

7. The multi-zone flexible interconnection device with distributed resource management and control capability according to claim 4, characterized in that: Total active power difference in the lost station area Greater than the total distributed generation output margin in the power outage area , and the total active power difference in the lost station area Less than the sum of the output margins of distributed power sources in all distribution areas In the case of , the coordinated control terminal is specifically used to determine the output of distributed power sources in each distribution station area through the following formula: ； in, Indicates that the coordination control terminal sends In the distribution area The power command value issued by the photovoltaic inverter of each distributed power source, Indicates In the distribution area The output margin of the photovoltaic inverter of a distributed power source, Indicates In the distribution area The actual value of the active power of the photovoltaic inverter of each distributed power source, Indicates that the coordination control terminal sends In the distribution area The power command value issued by the energy storage converter of each distributed power source, Indicates In the distribution area The output margin of the energy storage converter of a distributed power source, Indicates In the distribution area The actual value of the active power of the energy storage converter of a distributed power source.

8. The multi-zone flexible interconnection device with distributed resource management and control capability according to claim 7, characterized in that: The coordinated control terminal is also used to determine the power command corresponding to each VSC converter through the following formula: ； ； ； ； in, Indicates that the coordination control terminal sends The power command issued by each VSC converter, , Indicates the number of the distribution station area where no power failure occurs. Indicates The number of distributed power sources in each distribution area, Indicates Rated capacity of each VSC converter.

9. A coordinated control method, characterized in that: Applied to a multi-zone flexible interconnection device with distributed resource management and control capabilities as claimed in any one of claims 1 to 8, the method comprising: Receive the dispatching instructions issued by the distribution network master station through the communication module, and respond to the dispatching instructions to control the output of distributed power sources in each distribution station area through the communication module; In the event of a lost power area, the total active power difference in the lost power area and the output margin of the distributed power sources in each distribution area are determined, and based on the total active power difference in the lost power area and the output margin of the distributed power sources, the output of the distributed power sources in the distribution area is controlled.

10. The coordinated control method according to claim 9, characterized in that: The control of the output of the distributed power source in the distribution area based on the total active power difference in the lost station area and the output margin of the distributed power source includes: Based on the output margin of distributed power in each distribution area, determine the total output margin of distributed power in each distribution area and the sum of the output margin of distributed power in all distribution areas. ; Total distributed generation output margin in the power outage area Greater than or equal to the total active power difference in the lost station area In the case of power outage, control the output of distributed power sources in the area where the power is out of service; Or, the total difference in active power in the area where the station is lost Greater than the total distributed generation output margin in the power outage area , and the total active power difference in the lost station area Less than the sum of the output margins of distributed power sources in all distribution areas Under the circumstances, control the output of distributed power sources in each distribution station area; Or, the total difference in active power in the area where the station is lost Greater than or equal to the sum of the output margins of distributed power sources in all distribution areas In the case of a power outage, part of the load in the power outage area is removed until the total active power difference in the power outage area is met. Less than the sum of the output margins of distributed power sources in all distribution areas ; The sum of the output margins of distributed power sources in all distribution areas Determined by the following formula: ； in, Indicates the number of the lost station area. Indicates The total distributed power output margin of each distribution station area, Indicates the number of distribution station areas.

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