Multi-port flexible interconnection device and power mutual aid method

Abstract

The invention relates to the technical field of power control, in particular to a multi-port flexible interconnection device which comprises a container, a PCS chamber, a transformer chamber and an electric control cabinet, the PCS chamber, the transformer chamber and the electric control cabinet are installed in the container, the PCS chamber is arranged on the left side of an integrated box, the electric control cabinet is arranged on the right side of the integrated box, and the transformer chamber is arranged between the PCS chamber and the electric control cabinet. A multi-port energy router is arranged in the PCS room, an isolation transformer is arranged in the transformer room, the multi-port energy router is in communication connection with the isolation transformer, the isolation transformer is in communication connection with the electric control cabinet, the electric control cabinet is connected with the multiple sets of transformer areas, and efficient interconnection of power grids of the multiple transformer areas is achieved through multiple ports. The multi-port energy router carries out power dispatching and intelligent control on a plurality of transformer areas through an isolation transformer and an electric control cabinet, so that flexible energy distribution among the transformer areas is realized, and the power energy density is improved; the flexible interconnection device disclosed by the invention is integrated in a container, so that the waste of space resources is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power control, and particularly relates to a multi-port flexible interconnection device and a power interconnection method. BACKGROUND

[0002] With the accelerated transformation of new energy structure and the vigorous development of the power market, distributed energy and energy storage devices are massively connected to the power grid, resulting in extremely complex load characteristics of the power grid. The problem of uneven load distribution in the distribution network is increasingly prominent. Some areas are heavily loaded and face severe overload risks, while adjacent areas may be lightly loaded and the capacity is not fully utilized. In the face of such situations, the traditional solution usually relies on simple power grid capacity expansion, but this method has high investment costs, long construction periods, and is limited by site conditions, making it difficult to implement. Therefore, it is of great significance to realize load balancing and energy optimal allocation through interconnection and supply between areas, which can alleviate the great pressure of power grid upgrading and reconstruction.

[0003] The flexible interconnection device of the prior art is mostly fixed AC port, and the AC port is less, which makes it difficult to realize efficient interconnection of multi-area power grids, cannot adapt to the honeycomb distribution network structure, and the power unit cannot be adjusted, so the power output cannot be flexibly changed according to the actual load change, and the power range has great limitations. In addition, the existing flexible interconnection device is not reasonably integrated with the transformer, and the power energy density is low, resulting in waste of space resources. SUMMARY

[0004] Based on the above problems existing in the prior art, the purpose of the embodiments of the present application is to provide a multi-port flexible interconnection device and a power interconnection method.

[0005] The technical scheme adopted by the present application to solve its technical problems is: In a first aspect, the present application provides a multi-port flexible interconnection device, comprising a container, a PCS chamber, a transformer chamber and an electric control cabinet installed in the container, the PCS chamber is arranged on the left side of the container, the electric control cabinet is arranged on the right side of the container, and the transformer chamber is arranged between the PCS chamber and the electric control cabinet, a multi-port energy router is arranged in the PCS chamber, an isolation transformer is arranged in the transformer chamber, the multi-port energy router is in communication connection with the isolation transformer, the isolation transformer is in communication connection with the electric control cabinet, the electric control cabinet is connected with a plurality of groups of areas, and the multi-port energy router performs power scheduling and intelligent control on the plurality of areas through the isolation transformer and the electric control cabinet to realize flexible energy distribution between the plurality of areas.

[0006] Further, the multi-port energy router adopts a modular layered architecture, including a power unit module and a port expansion module, the power unit module adopts a modular design with a uniform size, and the port expansion module is configured with three alternating current ports by default, and can be expanded to four alternating current ports through an expansion interface board.

[0007] Further, the power unit module includes a plurality of groups of power units, each of which integrates an independent drive circuit, a power conversion circuit, and a signal sampling circuit, and the power unit internally includes an IGBT module, and by replacing the IGBT module of different current levels, a power range of 50kW~200kW can be continuously adjusted.

[0008] Further, each alternating current port is equipped with an independent filter circuit, a grid-connected contactor, a circuit breaker, and an interface circuit to ensure that there is no electrical interference between the ports.

[0009] Further, the power unit module adopts a topology conversion mechanism.

[0010] Further, the transformer chamber is internally provided with a layer plate, which is arranged at the middle position of the transformer chamber and is fixed by bolts, and the upper space and the lower space of the layer plate can both place the isolation transformer.

[0011] Further, the electric control cabinet includes a mounting plate, a circuit breaker, a fuse, a surge protection device, and a dual power supply switching device.

[0012] In a second aspect, the present application provides a power mutual assistance method, comprising: Step S1, assembling intelligent electric meters on isolation transformers corresponding to a plurality of target areas, and uploading real-time load power of the target areas to a multi-port energy router through RS485 communication respectively; Step S2, calculating real-time load rates of the target areas based on the real-time load power; Step S3, performing descending order sorting according to the real-time load rates, and calculating a difference between a maximum load rate and a minimum load rate; Step S4, presetting a load rate difference threshold, judging whether the difference exceeds the load rate difference threshold, when the difference exceeds the load rate difference threshold, determining to trigger a power mutual assistance process, otherwise, maintaining the current state and not starting mutual assistance; Step S5, calculating a total load rate of the plurality of target areas, and based on the total load rate, calculating a difference between an actual load rate of each target area and the total load rate.

[0013] Further, the step S5 further includes judging working states of the target areas based on the difference respectively, and outputting power according to the working states, and the working states include rectification and inversion states.

[0014] Further, the load rate difference threshold is adjusted to 15% to 25% according to the actual operation demand of the power distribution network.

[0015] The beneficial effects of the present application are: the present application provides a multi-port flexible interconnection device, including a container, a PCS chamber, a transformer chamber and an electric control cabinet installed in the container, the PCS chamber is arranged on the left side of the integrated box, the electric control cabinet is arranged on the right side of the integrated box, and the transformer chamber is arranged between the PCS chamber and the electric control cabinet, a multi-port energy router is arranged in the PCS chamber, an isolation transformer is arranged in the transformer chamber, the multi-port energy router is in communication connection with the isolation transformer, the isolation transformer is in communication connection with the electric control cabinet, the electric control cabinet is connected with a plurality of groups of transformer areas, efficient interconnection of multiple transformer area power grids is realized through multiple ports, the multi-port energy router realizes power scheduling and intelligent control of multiple transformer areas through the isolation transformer and the electric control cabinet, so as to realize flexible energy distribution among multiple transformer areas and improve power energy density. The flexible interconnection device of the present application integrates the PCS chamber, the transformer chamber and the electric control cabinet into one container, reduces the waste of space resources, and is equipped with a multi-port energy router in the PCS chamber, so as to realize efficient interconnection of multiple transformer area power grids through multiple ports, realize flexible energy distribution among multiple transformer areas, and improve power energy density. BRIEF DESCRIPTION OF DRAWINGS

[0016] The present application will be further described below in combination with the drawings and examples.

[0017] Figure 1 is a structural schematic diagram of the flexible interconnection device of embodiment 1 of the present application; Figure 2 is a structural internal connection schematic diagram of the flexible interconnection device of embodiment 1 of the present application; Figure 3 is a structural schematic diagram of the buffer sealing device of embodiment 1 of the present application; Figure 4 is a topological structure schematic diagram of the structure of the flexible interconnection device of embodiment 1 of the present application; Figure 5 is a flow schematic diagram of the power interconnection method of embodiment 2 of the present application; Figure 6 is a detailed flow schematic diagram of the power interconnection method of embodiment 2 of the present application.

[0018] Legend: 1. Container; 2. PCS room; 3. Transformer room; 4. Electrical control cabinet; 5. Transformer area 1; 6. Transformer area 2; 7. Transformer area 3; 21. Multi-port energy router; 22. Air inlet; 23. Air outlet; 24. Fan unit; 25. Buffer sealing device; 211. Exhaust vent; 31. Isolation transformer; 32. Shelf; 33. Axial flow fan; 41. Mounting plate; 42. Circuit breaker; 43. Fuse; 44. Surge protection device; 45. Dual power supply switching device. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 like Figures 1-2 As shown, this embodiment provides a multi-port flexible interconnection device 100, including an integrated box 1, a PCS (Power Conversion System) compartment 2, a transformer compartment 3, and an electrical control cabinet 4 installed inside the integrated box 1. The PCS compartment 2 is located on the left side of the integrated box 1, the electrical control cabinet 4 is located on the right side of the integrated box 1, and the transformer compartment 3 is located between the PCS compartment 2 and the electrical control cabinet 4. A 50kW multi-port energy router 21 is installed in the PCS compartment 2. The multi-port energy router 21 has an exhaust vent 211 on its side. The multi-port energy router 21 can be flexibly adjusted from two ports to four ports, and the power level can be flexibly configured from 50kW to 200kW, with a maximum energy density of 187kW / m³. Several sets of isolation transformers 31 are installed in the transformer compartment 3. The multi-port energy router 21 is communicatively connected to the isolation transformers 31, and the isolation transformers 31 are connected to the electrical control cabinet 4. The control cabinet 4 is connected to several distribution areas via communication. In this embodiment, the multi-port energy router 21 has three ports, which are respectively connected to three isolation transformers 31. Each isolation transformer 31 corresponds to the voltage adaptation and electrical isolation requirements of a distribution area. The three isolation transformers 31 are then simultaneously connected to the control cabinet 4, which in turn connects to three distribution areas corresponding to the isolation transformers 31: distribution area 1 (5), distribution area 2 (6), and distribution area 3 (7), achieving flexible interconnection and power sharing among the three distribution areas. In other words, in this embodiment, the multi-port energy router 21 completes power dispatching and intelligent control of the three distribution areas through the isolation transformers 31 and the control cabinet 4, thereby realizing flexible energy distribution between the distribution areas. The connection diagram is shown below. Figure 2 As shown.

[0021] As an optional embodiment, the lower part of the front surface of the cabinet door of the PCS room 2 is provided with an air inlet hole 22, and a filter screen is arranged at the air inlet hole 22 to filter some impurities. At the back of the PCS room 2, an air outlet 23 is opened at a position corresponding to the air outlet 211 of the multi-port energy router 21. A fan assembly 24 including a fan and a wind guide cover is arranged at the air outlet 23. The fan sucks the hot air in the PCS room 2 outward. The hot air in the PCS room 2 is continuously discharged through the air outlet 23 from inside to outside, so as to ensure that the multi-port energy router 21 in the PCS room 2 is at the most suitable working temperature. In addition, a buffer sealing device 25 is arranged between the air outlet 211 of the multi-port energy router 21 and the air outlet 23. As shown in Figure 3 , the buffer sealing device 25 is used to absorb the vibration generated by the working of the multi-port energy router 21, prevent the thermal expansion and cold contraction from causing a gap between the air outlet 211 and the air outlet 23, and cause some hot air to leak from the gap, which remains in the PCS room 2 and affects the heat dissipation effect of the PCS room 2.

[0022] As an optional embodiment, as shown in Figure 1 , a layer plate 32 is arranged in the transformer room 3. The layer plate 32 is arranged at the middle position of the transformer room 3 and is fixed by bolts. The upper space and the lower space of the layer plate 32 can each place an isolation transformer 31. Each space can accommodate two isolation transformers 31. The two isolation transformers 31 are installed side by side in each space. The bottom of the isolation transformer 31 installed in the lower space of the layer plate 32 is fixed to the bottom of the transformer room 3 and the container 1 by bolts. At most four isolation transformers 31 can be placed in the transformer room 3, which meets the flexible interconnection requirement of the four ports of the multi-port energy router 21 connecting four distribution areas. A 225kW axial flow fan 33 is also arranged in the upper space of the layer plate 32. The axial flow fan 33 is used for heat dissipation to the outside of the container 1. The axial flow fan 33 can be adjusted according to the actual power to meet the actual heat dissipation requirement of the isolation transformer 31, so as to achieve the effect of blocking common mode interference and isolating the ground loop.

[0023] As an optional embodiment, as shown in Figure 1As shown, the electric control cabinet 4 includes a mounting plate 41, a circuit breaker 42, a fuse 43, a surge protection device 44 and a dual power switching device 45, the circuit breaker 42, the fuse 43, the surge protection device 44 and the dual power switching device 45 are all mounted on the mounting plate 41, the circuit breaker 42 is mounted at the bottom of the mounting plate 41, the surge protection device 44, the dual power switching device 45 and the fuse 43 are sequentially arranged and mounted at the upper part of the mounting plate 41, the external incoming line connected with the electric control cabinet 4 uniformly enters from the bottom of the electric control cabinet 4, and then is connected with the circuit breaker 42 at the lowermost position, the electric control cabinet 4 internally adopts a modular design, the circuit breaker 42, the fuse 43, the surge protection device 44 and the dual power switching device 45 can be uniformly and previously mounted on the mounting plate 41, and then are uniformly integrated with the cabinet body of the container 1, thereby improving the production efficiency.

[0024] As an optional embodiment, the multi-port energy router adopts a modular layered architecture, including a power unit module and a port expansion module, the power unit module adopts a modular design with a uniform size, each power unit integrates an independent drive circuit, a power conversion circuit and a signal sampling circuit, the power unit internally includes an IGBT module, by replacing different current level IGBT modules, a continuous adjustment of a power range of 50kW~200kW can be realized; meanwhile, the power unit module also supports assembly switching of a two-level topology (T type) and a three-level topology (NPC), and is suitable for different grid voltage levels and load characteristics; the basic configuration of the port expansion module is three alternating current ports, which can be expanded to four alternating current ports through an increased expansion interface board, each alternating current port is equipped with an independent filter circuit, a grid-connected contactor, a circuit breaker and an interface circuit, to ensure that there is no electrical interference between the ports.

[0025] In the embodiment, the power unit module adopts a topology conversion mechanism, in the case that the external size of the power unit module does not change, the topology structure is adjusted according to the actual power, the power unit module is mutually converted between the two-level and the three-level, the power unit module is usually a two-level topology, and the three-level topology is adopted when the energy conversion efficiency and the harmonic requirement are higher.

[0026] As an optional embodiment, as shown in FIG. 6, the multi-port energy router 1 includes a power unit module 2 and a port expansion module 3, the power unit module 2 is connected with the port expansion module 3, the power unit module 2 is connected with the port expansion module 3 through a bus, the power unit module 2 is connected with the port expansion module 3 through a bus, and the power unit module 2 is connected with the port expansion module 3 through a bus. Figure 4The topology of the flexible interconnection device 100 of the embodiment is shown, which includes an alternating current part and a power distribution part. The multi-port energy router 21 includes three ports, connecting three transformer areas: transformer area one 5, transformer area two 6 and transformer area three 7. The alternating current part structures of the three transformer areas are consistent. Take transformer area one 5 as an example for illustration. The power grid side 1 represents the external power grid access point of the transformer area one 5. The circuit breaker is used to turn on and off the electrical connection between the transformer area one 5 and the flexible interconnection device 100, and quickly cut off the circuit in case of failure to ensure safety. The isolation transformer 31 is used to realize electrical isolation, block common mode interference and ground loop, and complete voltage transformation at the same time. The grounding protection branch includes a fuse and a grounding device, which is used for overcurrent protection and grounding fault protection of the power grid side 1. The connection logic of the alternating current part is power grid side 1-circuit breaker-isolation transformer-power distribution part, forming an energy transmission channel between the transformer area one 5 and the flexible interconnection device 100. The power distribution part is the core carrier of the multi-port energy router 21, which realizes power mutual aid (power compensation) and topology conversion between the three transformer areas. The filter is used to suppress the harmonics generated by the power conversion, and to ensure the quality of the grid-connected current. The input current and the filtered current are used to monitor the transformer area input current and the filtered current, and to provide data support for the control algorithm. The grid-connected contactor is used to control the on-off of the transformer area and the power unit module. It is closed during grid connection and opened during shutdown. The reactor is used to suppress current surges, stabilize the DC bus voltage of the power unit module, and participate in harmonic filtering at the same time. The power unit module (power module in the figure) includes a plurality of power units. The power unit is a power electronic conversion unit including an IGBT module. The power unit module is the core component of topology conversion, which realizes the bidirectional conversion of alternating current and direct current, and is used to realize the energy interaction between the energy storage battery and the power grid, enhance the power regulation flexibility of the flexible interconnection device, and realize the energy interaction between the energy storage battery and the power grid. The pre-charging branch includes a pre-charging resistor and a power distribution circuit breaker. When the flexible interconnection device starts, the pre-charging resistor is used to limit the impact current, and then the power distribution circuit breaker is closed to protect the power unit module.

[0027] In the connection logic of the whole topology of the embodiment, take transformer area one 5 as an example for power mutual aid of transformer area two 6. The power of transformer area one 5 is overloaded, and the power of transformer area two 6 is insufficient. Transformer area one 5 provides power mutual aid for transformer area two 6. The energy path is power grid side 1 of transformer area one 5-alternating current part #1 (circuit breaker-isolation transformer)-power distribution part (filter-input current-grid-connected contactor-reactor-power module)-PCS (or directly through another side power module)-reactor-grid-connected contactor-current monitoring-filter-alternating current part #2 (isolation transformer-circuit breaker)-power grid side 2 of transformer area two 6. The topology of the embodiment realizes flexible interconnection and intelligent power scheduling between multiple transformer areas through alternating current access of three transformer areas and power distribution conversion, and is the electrical implementation carrier of the multi-port energy router technical solution.

[0028] This embodiment provides a multi-port flexible interconnection device 100. This flexible interconnection device 100 integrates the PCS room 2, transformer room 3, and electrical control cabinet 4 into a container 1, reducing the waste of space resources. A multi-port energy router 21 is equipped in the PCS room 2, which realizes efficient interconnection of multiple transformer area power grids through multiple ports, realizes flexible energy distribution between multiple transformer areas, and improves power energy density. Through a unified size design and power unit modules that are replaceable with IGBT modules, it realizes a wide range of power regulation from 50 to 200 kW and supports topology conversion to adapt to different operating conditions. The multi-port energy router 21 adopts a basic 3-port configuration and can be expanded to a maximum of 4 ports to meet the interconnection needs of multiple areas in a cellular distribution network and solve the limitations of traditional 2-port devices.

[0029] Example 2 like Figure 5 As shown, this embodiment provides a power mutual assistance method, which is implemented based on the structure of the multi-port flexible interconnection device in Embodiment 1 above. The multi-port energy router 21 is equipped with three ports, connecting three transformer substations, including: Step S1: Install smart meters on the isolation transformers 31 corresponding to the three distribution areas. Use RS485 communication to upload the real-time load power of the isolation transformers 31 of each of the three distribution areas to the multi-port energy router 21, and calculate the real-time load rate. The load power of the three distribution areas is expressed as follows: , , The real-time load rate is expressed as follows: , , Taking transformer area 15 as an example, calculate the real-time load rate. , This is the rated power of the 5th transformer substation.

[0030] Step S2: Sort the load rates L of the three transformer areas by size and calculate the maximum load rate. and minimum load rate The difference.

[0031] Step S3: Set a preset load rate difference threshold. Determine if the difference exceeds the load rate difference threshold. If the difference exceeds the threshold, trigger the power mutual assistance process; otherwise, maintain the current state and do not initiate mutual assistance. The preset load rate difference threshold is 20%, which can be adjusted according to actual conditions. At that time, the flexible interconnect device 100 begins to perform power mutual assistance.

[0032] Step S4: Calculate the total load factor of the three transformer areas. , , which is the arithmetic mean of the load rates of the three transformer substations. is the core reference to determine whether the power energy of a single substation is surplus or shortage. If the load rate of a substation is lower than , it indicates that the capacity is not fully utilized and energy can be output; if it is higher than , it indicates that the load pressure is large and energy needs to be supplemented, providing a unified reference standard for subsequent power direction judgment.

[0033] Step S5, respectively calculate the difference between the actual load rate and the total load rate of each substation, respectively represented as , , , , , .

[0034] In this embodiment, step S5 further includes: respectively judging the working state of a single substation for the three substations, the working state including rectification and inversion state, and outputting power according to the working state, as shown in Figure 6 , the judgment logic is as follows: Substation 1 5: if , the load rate of substation 1 5 is lower than the total load rate, the power energy of substation 1 5 is surplus, the working state is rectification state, and the power input to the flexible interconnection device 100 is , , is the rated power of substation 1 5; if , the load rate of substation 1 5 is higher than the total load rate, the power energy of substation 1 5 is shortage, the working state is inversion state, and the power input to the flexible interconnection device 100 is , , is the rated power of substation 1 5.

[0035] Similarly, substation 2 6: if , the load rate of substation 2 6 is lower than the total load rate, the power energy of substation 2 6 is surplus, the working state is rectification state, and the power input to the flexible interconnection device 100 is , , is the rated power of substation 2 6; if , the load rate of substation 2 6 is higher than the total load rate, the power energy of substation 2 6 is shortage, the working state is inversion state, and the power input to the flexible interconnection device 100 is , , is the rated power of substation 2 6.

[0036] Similarly, substation 3 7: if If the load rate of transformer substation 37 is lower than the total load rate, transformer substation 37 has excess power and operates in rectification mode, inputting power to the flexible interconnect device 100. , , This is the rated power of transformer substation 3-7; like If the load factor of transformer substation 37 is higher than the total load factor, transformer substation 37 will experience a power shortage and will operate in inverter mode, inputting power to the flexible interconnect device 100. , , This is the rated power of the third-generation power supply in the substation.

[0037] This embodiment provides a power balancing method based on the multi-port flexible interconnection device provided in Embodiment 1. This power balancing method collects load data from multiple transformer substations via RS485 communication, determines the operating status of each substation based on a load rate difference threshold and the total load rate, and outputs power according to the operating status. This can achieve load balancing for up to four substations within a power range of 50-200kW, effectively mitigating heavy load risks and improving grid stability. Simultaneously, it adapts to modular hardware design to reduce expansion and maintenance costs.

[0038] Example 3 This embodiment relates to a computer-readable storage medium storing a computer program. When executed by a processor, the computer program implements the power mutual assistance method of Embodiment 1 described above.

[0039] That is, those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0040] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of the present invention. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A multi-port flexible interconnect device, comprising: The container is provided with a PCS chamber, a transformer chamber and an electric control cabinet, the PCS chamber is arranged on the left side of the container, the electric control cabinet is arranged on the right side of the container, and the transformer chamber is arranged between the PCS chamber and the electric control cabinet, a multi-port energy router is arranged in the PCS chamber, an isolation transformer is arranged in the transformer chamber, the multi-port energy router is in communication connection with the isolation transformer, the isolation transformer is in communication connection with the electric control cabinet, the electric control cabinet is connected with a plurality of groups of transformer areas, and the multi-port energy router is used for power scheduling and intelligent control of the plurality of transformer areas through the isolation transformer and the electric control cabinet, so that energy flexible distribution among the plurality of transformer areas is realized.

2. The multi-ported flexible interconnect device of claim 1, wherein, The multi-port energy router adopts a modular layered architecture, and comprises power unit modules and port expansion modules, the power unit modules adopt a unified size modular design, and the port expansion modules are provided with three AC ports, and can be expanded to four AC ports through an expansion interface board.

3. The multi-ported flexible interconnect device of claim 2, wherein, The power unit module comprises a plurality of groups of power units, each power unit is integrated with an independent drive circuit, a power conversion circuit and a signal sampling circuit, the power unit internally comprises an IGBT module, and the power range of 50kW-200kW can be continuously adjusted by replacing the IGBT modules of different current levels.

4. The multi-ported flexible interconnect device of claim 2, wherein, Each AC port is provided with an independent filter circuit, a grid-connected contactor, a circuit breaker and an interface circuit, so as to ensure that there is no electrical interference among the ports.

5. The multi-ported flexible interconnect device of claim 4, wherein, The power unit module adopts a topology conversion mechanism.

6. The multi-ported flexible interconnect device of claim 4, wherein, The transformer chamber is internally provided with a layer plate, the layer plate is arranged at a middle position of the transformer chamber and is fixed by bolts, and the upper space and the lower space of the layer plate can both place the isolation transformer.

7. The multi-ported flexible interconnect device of claim 1, wherein, The electric control cabinet comprises a mounting plate, a circuit breaker, a fuse, a surge protection device and a dual-power switching device.

8. A method of power sharing for a multi-port flexible interconnect device as claimed in any one of claims 1 to 7, wherein, Comprise: Step S1, assembling intelligent electric meters on isolation transformers corresponding to a plurality of target transformer areas, and uploading real-time load powers of the target transformer areas to a multi-port energy router through RS485 communication respectively; Step S2, calculating real-time load rates of the target transformer areas based on the real-time load powers; Step S3, performing descending order sorting according to the real-time load rates, and calculating a difference value between a maximum load rate and a minimum load rate; Step S4, presetting a load rate difference threshold value, judging whether the difference value exceeds the load rate difference threshold value, when the difference value exceeds the load rate difference threshold value, determining that a power mutual aid process is triggered, otherwise, maintaining a current state and not starting mutual aid; Step S5, calculating a total load rate of the plurality of target transformer areas, and calculating a difference value between an actual load rate of each target transformer area and the total load rate based on the total load rate.

9. The method of claim 8, wherein, The step S5 further comprises judging working states of the target transformer areas based on the difference value, and outputting power according to the working states, and the working states comprise rectification and inversion states.

10. The method of claim 9, wherein, The load rate difference threshold value is adjusted to 15%-25% according to actual operation requirements of a power distribution network.

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