A microgrid cluster system based on single grid-connected power line connection and dynamic networking

Abstract

The present invention belongs to the field of microgrid technology, and specifically relates to a microgrid cluster system based on single grid-connected power line connection and dynamic networking. Aiming at the distributed renewable energy application scenario of building multiple microgrid systems in one area, according to the main technical characteristics and networking characteristics of the microgrid and from the perspective of optimizing the top-level design, a single grid-connected power line L is used to connect with multiple decentralized independent microgrid systems through the grid access point LC and the grid switch GK, and the grid switch GK and the microgrid energy management system SEMS are controlled by the microgrid cluster energy management and control system GEMS to complete the dynamic networking and form the microgrid cluster system GM, realizing the dynamic connection of multiple decentralized independent microgrid systems and being able to flexibly and effectively control the overall operation and resource sharing of the microgrid cluster system, providing a feasible solution for the safe, reliable and efficient networking of the microgrid cluster system, which is beneficial to the application and development trend of distributed renewable energy.

Description

Technical Field

[0001] The present invention belongs to the technical field of microgrids, and in particular relates to a microgrid cluster system based on single grid-connected power line connection and dynamic networking. Background Art

[0002] The widespread application of new energy, especially distributed renewable energy, and the uncertainty and volatility of distributed renewable energy have added great challenges to the smooth operation of the power grid. Local microgrids connect distributed renewable energy, energy storage, and loads together for local balance and nearby consumption, which is one of the effective methods for the efficient application of distributed renewable energy.

[0003] Since distributed renewable energy has a relatively low energy density and is suitable for decentralized installation and on-site application, especially in areas with relatively developed agriculture, industry, commerce and education where centralized sites are relatively scarce, and the application of distributed new energy microgrid systems is a process of gradual increase and development, the phenomenon of building multiple microgrid systems in one region has begun to emerge. It is necessary to study the overall operation and resource sharing of a microgrid cluster system composed of multiple decentralized microgrids connected together, which is also a development trend of distributed renewable energy applications. The microgrid cluster system is a complex system, and there is currently no mature and effective construction method and operation control method. Summary of the invention

[0004] In order to connect multiple scattered microgrids to form a microgrid cluster system and effectively control the overall operation and resource sharing of the microgrid cluster system, the present invention proposes a method for the composition and operation control of a microgrid cluster system from the perspective of optimizing the top-level design based on the main technical characteristics and networking characteristics of the microgrid, so as to achieve full autonomy and controlled sharing of each microgrid system.

[0005] The present invention specifically discloses a microgrid cluster system based on single grid-connected power line connection and dynamic networking, characterized in that: there are two or more independent microgrid systems M, each independent microgrid system M has one and only one grid-connected access point LC connected to a single grid-connected power line L, each grid-connected access point LC of each independent microgrid system M is connected to the single grid-connected power line L through a grid-connected switch GK dynamically controlled by a microgrid cluster energy management and control system GEMS, dynamically forming a microgrid cluster system GM, and each independent microgrid system M has its own microgrid energy management system SEMS and is controlled by the microgrid cluster energy management and control system GEMS, and electric energy interaction between each microgrid system M is performed through a single grid-connected power line L, characterized in that:

[0006] Step 1: The microgrid cluster energy management and control system GEMS connects and communicates with each independent microgrid system M through the cluster communication network GN, which has its own microgrid energy management system SEMS, confirms each microgrid system M connected to the dynamic networking of the microgrid cluster system GM, and registers the capacity value of each microgrid system M to interact with the outside world;

[0007] Step 2: The microgrid cluster energy management and control system GEMS monitors in real time whether there are two or more microgrid systems M applying for connection to a single grid-connected power line L (5) through its own microgrid energy management system SEMS;

[0008] Step 3: No, continue monitoring;

[0009] Step 4: Yes, compare the interactive energy capacity values ​​of all microgrid systems M that apply to be connected to a single grid-connected power line L and select the microgrid with the largest capacity to connect to the single grid-connected power line L first, and set the grid connection point to zero power, and then connect the other microgrid systems M one by one to the single grid-connected power line L and set the grid connection point to zero power, forming a microgrid cluster system GM dynamic networking and operation;

[0010] Step 5: The microgrid cluster energy management and control system GEMS monitors whether there is a microgrid system M applying for external energy exchange. If not, continue monitoring;

[0011] Step 6: If yes, determine whether:

[0012] The total amount of interactive energy applied for is ≥ the sum of the interactive energy capacity values ​​of the remaining microgrid systems M that have not applied for interactive energy;

[0013] Step 7: No, the microgrid cluster energy management and control system GEMS generates and issues an instruction to allow interactive energy and continues monitoring;

[0014] Step 8: If yes, the excess interactive energy is calculated and subtracted, and a new interactive energy instruction is generated and sent to the corresponding microgrid system M that applies for the interactive energy. The microgrid system M that applies for the interactive energy executes the new interactive energy instruction;

[0015] Step 9: The microgrid cluster energy management and control system GEMS monitors and regulates in real time and maintains:

[0016] The total amount of interactive energy applied for is ≤ the sum of the interactive energy capacity values ​​of the remaining microgrid systems M that have not applied for interactive energy;

[0017] At the same time, the microgrid cluster energy management and control system GEMS goes to step 5;

[0018] It is characterized in that the first microgrid system M1 in each microgrid system M of the microgrid cluster system GM is connected to the first grid-connected switch GK1 through the first grid-connected access point LC1, and the first grid-connected switch GK1 is connected to a single grid-connected power line L connected to the public power grid; the second microgrid system M2 in each microgrid system M is connected to the second grid-connected switch GK2 through the second grid-connected access point LC2, and the second grid-connected switch GK2 is connected to a single grid-connected power line L connected to the public power grid; the i-th microgrid system Mi in each microgrid system M is connected to the i-th grid-connected switch GKi through the i-th grid-connected access point LCi, and the i-th grid-connected switch GKi is connected to a single grid-connected power line L connected to the public power grid; the n-th microgrid system Mn in each microgrid system M The nth grid-connected switch GKn is connected through the nth grid-connected access point LCn, and the nth grid-connected switch GKn is connected to a single grid-connected power line L connected to the public power grid; and the microgrid cluster energy management and control system GEMS is respectively connected to the first grid-connected switch GK1, the second grid-connected switch GK2, the i-th grid-connected switch GKi, and the n-th grid-connected switch GKn through the cluster communication network GN, and realizes dynamic networking by controlling their opening and closing to form a microgrid cluster system GM, and at the same time, the energy of the microgrid cluster system GM is controlled by the connected first microgrid energy management system SEMS1, the second microgrid energy management system SEMS2, the i-th microgrid energy management system SEMSi, and the n-th microgrid energy management system SEMSn;

[0019] It is characterized in that the first microgrid power supply, the first microgrid energy storage system, and the first microgrid load of the first microgrid system M1 in each microgrid system M of the microgrid cluster system GM are respectively connected to the first microgrid system power line through the first microgrid power supply networking switch, the first microgrid energy storage networking switch, and the first microgrid load networking switch, and the first microgrid energy management system SEMS1 is respectively connected to the first microgrid power supply, the first microgrid energy storage system, the first microgrid load and the first microgrid power supply networking switch, the first microgrid energy storage networking switch, and the first microgrid load networking switch through the first microgrid communication network to form an independent first microgrid system M1;

[0020] The second microgrid power supply, the second microgrid energy storage system, and the second microgrid load of the second microgrid system M2 in each microgrid system M of the microgrid cluster system GM are respectively connected to the second microgrid system power line through the second microgrid power supply networking switch, the second microgrid energy storage networking switch, and the second microgrid load networking switch, and the second microgrid energy management system SEMS2 is respectively connected to the second microgrid power supply, the second microgrid energy storage system, the second microgrid load and the second microgrid power supply networking switch, the second microgrid energy storage networking switch, and the second microgrid load networking switch through the second microgrid communication network to form an independent second microgrid system M2;

[0021] The i-th microgrid power supply, the i-th microgrid energy storage system, and the i-th microgrid load of the i-th microgrid system Mi in each microgrid system M of the microgrid cluster system GM are respectively connected to the i-th microgrid system power line through the i-th microgrid power supply networking switch, the i-th microgrid energy storage networking switch, and the i-th microgrid load networking switch, and the i-th microgrid energy management system SEMSi is respectively connected to the i-th microgrid power supply, the i-th microgrid energy storage system, the i-th microgrid load and the i-th microgrid power supply networking switch, the i-th microgrid energy storage networking switch, and the i-th microgrid load networking switch through the i-th microgrid communication network to form an independent i-th microgrid system Mi;

[0022] The nth microgrid power supply, the nth microgrid energy storage system, and the nth microgrid load of the nth microgrid system Mn in each microgrid system M of the microgrid cluster system GM are respectively connected to the power line of the nth microgrid system through the nth microgrid power supply networking switch, the nth microgrid energy storage networking switch, and the nth microgrid load networking switch, and the nth microgrid energy management system SEMSn is respectively connected to the nth microgrid power supply, the nth microgrid energy storage system, the nth microgrid load and the nth microgrid power supply networking switch, the nth microgrid energy storage networking switch, and the nth microgrid load networking switch through the nth microgrid communication network to form an independent nth microgrid system Mn.

[0023] The microgrid cluster system based on a single grid-connected power line connection and dynamic networking is characterized in that the capacity value of each microgrid system M for external interactive energy is the basic information reported by each microgrid system M to the microgrid cluster energy management and control system GEMS through the microgrid energy management system SEMS and at least includes the maximum power value of the external interactive energy and the maximum electrical quantity value of the primary interactive energy.

[0024] The present invention discloses a microgrid cluster system based on a single grid-connected power line connection and dynamic networking. Aiming at a distributed renewable energy application scenario in which multiple microgrid systems are built in one area, according to the main technical characteristics and networking characteristics of the microgrid and from the perspective of optimizing the top-level design, a single grid-connected power line L is used to connect with multiple decentralized independent microgrid systems through a grid access point LC and a grid switch GK respectively, and the grid switch GK and the microgrid energy management system SEMS are controlled by a microgrid cluster energy management and control system GEMS to complete dynamic networking and form a microgrid cluster system GM, thereby realizing dynamic connection of multiple decentralized independent microgrid systems and being able to flexibly and effectively control the overall operation and resource sharing of the microgrid cluster system, providing a feasible solution for the safe, reliable and efficient networking of the microgrid cluster system, and being beneficial to the application and development trend of distributed renewable energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1The present invention is a flow chart of networking and energy control of a microgrid cluster system based on a single grid-connected power line connection and dynamic networking.

[0026] Figure 2 The present invention is a principle block diagram of a microgrid cluster system and its composition based on a single grid-connected power line connection and dynamic networking.

[0027] Figure 3 This is a principle block diagram of the first microgrid system M1.

[0028] Figure 4 This is a principle block diagram of the second microgrid system M2.

[0029] Figure 5 This is the principle block diagram of the i-th microgrid system Mi.

[0030] Figure 6 This is the principle block diagram of the nth microgrid system Mn. DETAILED DESCRIPTION

[0031] As an implementation example, a microgrid cluster system for optimizing the control of network source storage and load under grid-connected constraints is described in conjunction with the accompanying drawings. However, the described embodiment is a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The technology and solutions of the present invention are not limited to the contents given in this embodiment example.

[0032] like Figure 1 As shown, a microgrid cluster system based on single grid-connected power line connection and dynamic networking is characterized in that: it consists of two or more independent microgrid systems M, each independent microgrid system M has one and only one grid-connected access point LC connected to a single grid-connected power line L (5), each grid-connected access point LC of each independent microgrid system M is connected to the single grid-connected power line L (5) through a grid-connected switch GK dynamically controlled by a microgrid cluster energy management and control system GEMS (6), dynamically forming a microgrid cluster system GM (1), and each independent microgrid system has its own microgrid energy management system SEMS and is controlled by the microgrid cluster energy management and control system GEMS (6), and electric energy interaction between each microgrid system M is carried out through the single grid-connected power line L (5), and its characteristics are:

[0033] Step 1: The microgrid cluster energy management and control system GEMS (6) connects and communicates with each independent microgrid system M having its own microgrid energy management system SEMS through the cluster communication network GN (7), confirms each microgrid system M connected to the dynamic networking of the microgrid cluster system GM (1) and registers the capacity value of each microgrid system M to interact with the outside world;

[0034] Step 2: The microgrid cluster energy management and control system GEMS (6) monitors in real time whether there are two or more microgrid systems M applying for connection to a single grid-connected power line L (5) through their own microgrid energy management system SEMS;

[0035] Step 3: No, continue monitoring;

[0036] Step 4: Yes, compare the capacity values ​​of the interactive energy of all microgrid systems M that apply to be connected to the single grid-connected power line L(5) and select the microgrid with the largest capacity to connect to the single grid-connected power line L(5) first, and set the grid connection point to zero power, and then connect the other microgrid systems M one by one to the single grid-connected power line L(5) and set the grid connection point to zero power, so as to form a dynamic network of the microgrid cluster system GM(1) and operate;

[0037] Step 5: The microgrid cluster energy management and control system GEMS (6) monitors whether there is a microgrid system M applying for external energy exchange, if not, continues monitoring;

[0038] Step 6: If yes, determine whether the following is satisfied: the total amount of interactive energy applied for ≥ the sum of the interactive energy capacity values ​​of the remaining microgrid systems M that have not applied for interactive energy;

[0039] Step 7: No, the microgrid cluster energy management and control system GEMS (6) generates and issues an instruction to allow interactive energy and continues monitoring;

[0040] Step 8: If yes, the excess interactive energy is calculated and subtracted, and a new interactive energy instruction is generated and sent to the corresponding microgrid system M that applies for the interactive energy. The microgrid system M that applies for the interactive energy executes the new interactive energy instruction;

[0041] Step 9: The microgrid cluster energy management and control system GEMS (6) monitors and controls in real time and maintains: the total amount of applied interactive energy ≤ the sum of the interactive energy capacity values ​​of the remaining microgrid systems M that have not applied for interactive energy;

[0042] At the same time, the microgrid cluster energy management and control system GEMS (6) goes to step 5;

[0043] like Figure 2As shown, a microgrid cluster system based on single grid-connected power line connection and dynamic networking, the microgrid cluster system GM (1) is characterized in that: the first microgrid system M1 (11) in each microgrid system M is connected to the first grid-connected switch GK1 (31) through the first grid-connected access point LC1 (21), and the first grid-connected switch GK1 (31) is connected to the single grid-connected power line L (5) connected to the public power grid (8); the second microgrid system M2 (12) in each microgrid system M The second grid-connected switch GK2 (32) is connected via the second grid-connected access point LC2 (22), and the second grid-connected switch GK2 (32) is connected to a single grid-connected power line L (5) connected to the public power grid (8); the i-th microgrid system Mi (1i) in each microgrid system M is connected to the i-th grid-connected switch GKi (3i) via the i-th grid-connected access point LCi (2i), and the i-th grid-connected switch GKi (3i) is connected to the single grid-connected power line L (5) connected to the public power grid (8); each The nth microgrid system Mn (1n) in the microgrid system M is connected to the nth grid-connected switch GKn (3n) through the nth grid-connected access point LCn (2n), and the nth grid-connected switch GKn (3n) is connected to a single grid-connected power line L (5) connected to the public power grid (8); and the microgrid cluster energy management and control system GEMS (6) is respectively connected to the first grid-connected switch GK1 (31), the second grid-connected switch GK2 (32), the i-th grid-connected switch GKi (3i), and the n-th grid-connected switch GKn (3n) through the cluster communication network GN (7) and realizes dynamic networking to form a microgrid cluster system GM (1) by controlling their opening and closing, and at the same time, the energy of the microgrid cluster system GM (1) is controlled by the connected first microgrid energy management system SEMS1 (41), the second microgrid energy management system SEMS2 (42), the i-th microgrid energy management system SEMSi (4i), and the n-th microgrid energy management system SEMSn (4n);

[0044] like Figure 3 As shown, the microgrid cluster system GM (1), the first microgrid system M1 (11) in each microgrid system M is characterized in that: the first microgrid power supply (112), the first microgrid energy storage system (113), and the first microgrid load (114) are connected to the first microgrid system power line (118) through the first microgrid power supply networking switch (115), the first microgrid energy storage networking switch (116), and the first microgrid load networking switch (117), respectively, and the first microgrid energy management system SEMS1 (41) is connected to the first microgrid power supply (112), the first microgrid energy storage system (113), the first microgrid load (114) and the first microgrid power supply networking switch (115), the first microgrid energy storage networking switch (116), and the first microgrid load networking switch (117) through the first microgrid communication network (111), respectively, to form an independent first microgrid system M1 (11);

[0045] like Figure 4 As shown, the microgrid cluster system GM (1), the second microgrid system M2 (12) in each microgrid system M is characterized in that: the second microgrid power supply (122), the second microgrid energy storage system (123), and the second microgrid load (124) are connected to the second microgrid system power line (128) through the second microgrid power supply networking switch (125), the second microgrid energy storage networking switch (126), and the second microgrid load networking switch (127), respectively, and the second microgrid energy management system SEMS2 (42) is connected to the second microgrid power supply (122), the second microgrid energy storage system (123), the second microgrid load (124) and the second microgrid power supply networking switch (125), the second microgrid energy storage networking switch (126), and the second microgrid load networking switch (127) through the second microgrid communication network (121), respectively, to form an independent second microgrid system M2 (12);

[0046] like Figure 5 As shown, the microgrid cluster system GM (1), the i-th microgrid system Mi (1i) in each microgrid system M is characterized in that: the i-th microgrid power supply (1i2), the i-th microgrid energy storage system (1i3), and the i-th microgrid load (1i4) are respectively connected to the i-th microgrid system power line (1i8) through the i-th microgrid power supply networking switch (1i5), the i-th microgrid energy storage networking switch (1i6), and the i-th microgrid load networking switch (1i7), and the i-th microgrid energy management system SEMSi (4i) is respectively connected to the i-th microgrid power supply (1i2), the i-th microgrid energy storage system (1i3), the i-th microgrid load (1i4) and the i-th microgrid power supply networking switch (1i5), the i-th microgrid energy storage networking switch (1i6), and the i-th microgrid load networking switch (1i7) through the i-th microgrid communication network (1i1), thereby forming an independent i-th microgrid system Mi (1i);

[0047] like Figure 6As shown, the microgrid cluster system GM (1), the nth microgrid system Mn (1n) in each microgrid system M is characterized in that: the nth microgrid power supply (1n2), the nth microgrid energy storage system (1n3), and the nth microgrid load (1n4) are connected to the nth microgrid system power line (1n8) through the nth microgrid power supply networking switch (1n5), the nth microgrid energy storage networking switch (1n6), and the nth microgrid load networking switch (1n7), respectively, and the nth microgrid energy management system SEMSn (4n) is connected to the nth microgrid power supply (1n2), the nth microgrid energy storage system (1n3), the nth microgrid load (1n4) and the nth microgrid power supply networking switch (1n5), the nth microgrid energy storage networking switch (1n6), and the nth microgrid load networking switch (1n7) through the nth microgrid communication network (1n1), respectively, to form an independent nth microgrid system Mn (1n).

[0048] The microgrid cluster system based on a single grid-connected power line connection and dynamic networking is characterized in that the capacity value of each microgrid system M for external interactive energy is the basic information reported by each microgrid system M to the microgrid cluster energy management and control system GEMS (6) through the microgrid energy management system SEMS and at least includes the maximum power value of the external interactive energy and the maximum electrical quantity value of the primary interactive energy.

[0049] The present invention discloses a microgrid cluster system based on a single grid-connected power line connection and dynamic networking. Aiming at a distributed renewable energy application scenario in which multiple microgrid systems are built in one area, according to the main technical characteristics and networking characteristics of the microgrid and from the perspective of optimizing the top-level design, a single grid-connected power line L is used to connect with multiple decentralized independent microgrid systems through a grid access point LC and a grid switch GK respectively, and the grid switch GK and the microgrid energy management system SEMS are controlled by a microgrid cluster energy management and control system GEMS to complete dynamic networking and form a microgrid cluster system GM, thereby realizing dynamic connection of multiple decentralized independent microgrid systems and being able to flexibly and effectively control the overall operation and resource sharing of the microgrid cluster system, providing a feasible solution for the safe, reliable and efficient networking of the microgrid cluster system, and being beneficial to the application and development trend of distributed renewable energy.

Claims

1. A microgrid cluster system based on single grid-connected power line connection and dynamic networking, comprising two or more independent microgrid systems M, each independent microgrid system M having one and only one grid-connected access point LC connected to a single grid-connected power line L (5), each grid-connected access point LC of each independent microgrid system M being connected to the single grid-connected power line L (5) through a grid-connected switch GK dynamically controlled by a microgrid cluster energy management and control system GEMS (6), dynamically forming a microgrid cluster system GM (1), and each independent microgrid system M having its own microgrid energy management system SEMS and being controlled by the microgrid cluster energy management and control system GEMS (6), and performing power exchange between each microgrid system M through the single grid-connected power line L (5), wherein: Step 1: The microgrid cluster energy management and control system GEMS (6) connects and communicates with each independent microgrid system M having its own microgrid energy management system SEMS through the cluster communication network GN (7), confirms each microgrid system M connected to the dynamic networking of the microgrid cluster system GM (1) and registers the capacity value of each microgrid system M to interact with the outside world; Step 2: The microgrid cluster energy management and control system GEMS (6) monitors in real time whether there are two or more microgrid systems M applying for connection to a single grid-connected power line L (5) through their own microgrid energy management system SEMS; Step 3: No, continue monitoring; Step 4: Yes, compare the capacity values ​​of the interactive energy of all microgrid systems M that apply to be connected to the single grid-connected power line L(5) and select the microgrid with the largest capacity to connect to the single grid-connected power line L(5) first, and set the grid connection point to zero power, and then connect the other microgrid systems M one by one to the single grid-connected power line L(5) and set the grid connection point to zero power, so as to form a dynamic network of the microgrid cluster system GM(1) and operate; Step 5: The microgrid cluster energy management and control system GEMS (6) monitors whether there is a microgrid system M applying for external energy exchange, if not, continues monitoring; Step 6: If yes, determine whether: The total amount of interactive energy applied for is ≥ the sum of the interactive energy capacity values ​​of the remaining microgrid systems M that have not applied for interactive energy; Step 7: No, the microgrid cluster energy management and control system GEMS (6) generates and issues an instruction to allow interactive energy and continues monitoring; Step 8: If yes, the excess interactive energy is calculated and subtracted, and a new interactive energy instruction is generated and sent to the corresponding microgrid system M that applies for the interactive energy. The microgrid system M that applies for the interactive energy executes the new interactive energy instruction; Step 9: The microgrid cluster energy management and control system GEMS (6) monitors and controls in real time and maintains: The total amount of interactive energy applied for is ≤ the sum of the interactive energy capacity values ​​of the remaining microgrid systems M that have not applied for interactive energy; At the same time, the microgrid cluster energy management and control system GEMS (6) goes to step 5; The invention is characterized in that, in each microgrid system M of the microgrid cluster system GM (1), the first microgrid system M1 (11) is connected to the first grid-connected switch GK1 (31) through the first grid-connected access point LC1 (21), and the first grid-connected switch GK1 (31) is connected to a single grid-connected power line L (5) connected to the public power grid (8); the second microgrid system M2 (12) in each microgrid system M is connected to the second grid-connected power line L (5) through the second grid-connected access point LC2 (22). The first microgrid system Mi (1i) in each microgrid system M is connected to the first grid-connected switch GKi (3i) through the first grid-connected access point LCi (2i), and the second grid-connected switch GK2 (32) is connected to the single grid-connected power line L (5) connected to the public power grid (8); the nth microgrid system Mi (1i) in each microgrid system M is connected to the first grid-connected switch GKi (3i) through the first grid-connected access point LCi (2i), and the nth microgrid system Mi (1i) in each microgrid system M is connected to the first grid-connected switch GKi (3i) through the first grid-connected access point LCi (2i). Mn (1n) is connected to the nth grid-connected switch GKn (3n) through the nth grid-connected access point LCn (2n), and the nth grid-connected switch GKn (3n) is connected to a single grid-connected power line L (5) connected to the public power grid (8); and the microgrid cluster energy management and control system GEMS (6) is respectively connected to the first grid-connected switch GK1 (31), the second grid-connected switch GK2 (32), the i-th grid-connected switch GKi (3i), and the n-th grid-connected switch GKn (3n) through the cluster communication network GN (7) and realizes dynamic networking to form a microgrid cluster system GM (1) by controlling their opening and closing, and at the same time, the energy of the microgrid cluster system GM (1) is controlled by the connected first microgrid energy management system SEMS1 (41), the second microgrid energy management system SEMS2 (42), the i-th microgrid energy management system SEMSi (4i), and the n-th microgrid energy management system SEMSn (4n); The invention is characterized in that, in each microgrid system M of the microgrid cluster system GM (1), the first microgrid power supply (112), the first microgrid energy storage system (113), and the first microgrid load (114) of the first microgrid system M1 (11) are connected to the first microgrid system power line (118) through the first microgrid power supply networking switch (115), the first microgrid energy storage networking switch (116), and the first microgrid load networking switch (117), respectively, and the first microgrid energy management system SEMS1 (41) is connected to the first microgrid power supply (112), the first microgrid energy storage system (113), the first microgrid load (114) and the first microgrid power supply networking switch (115), the first microgrid energy storage networking switch (116), and the first microgrid load networking switch (117) through the first microgrid communication network (111), respectively, to form an independent first microgrid system M1 (11); In each microgrid system M of the microgrid cluster system GM (1), the second microgrid power supply (122), the second microgrid energy storage system (123), and the second microgrid load (124) of the second microgrid system M2 (12) are connected to the second microgrid system power line (128) through the second microgrid power supply networking switch (125), the second microgrid energy storage networking switch (126), and the second microgrid load networking switch (127), respectively, and the second microgrid energy management system SEMS2 (42) is connected to the second microgrid power supply (122), the second microgrid energy storage system (123), the second microgrid load (124) and the second microgrid power supply networking switch (125), the second microgrid energy storage networking switch (126), and the second microgrid load networking switch (127) through the second microgrid communication network (121), respectively, to form an independent second microgrid system M2 (12); The i-th microgrid power supply (1i2), the i-th microgrid energy storage system (1i3), and the i-th microgrid load (1i4) of the i-th microgrid system Mi (1i) in each microgrid system M of the microgrid cluster system GM (1) are respectively connected to the i-th microgrid system power line (1i8) through the i-th microgrid power supply networking switch (1i5), the i-th microgrid energy storage networking switch (1i6), and the i-th microgrid load networking switch (1i7), and the i-th microgrid energy management system SEMSi (4i) is respectively connected to the i-th microgrid power supply (1i2), the i-th microgrid energy storage system (1i3), the i-th microgrid load (1i4) and the i-th microgrid power supply networking switch (1i5), the i-th microgrid energy storage networking switch (1i6), and the i-th microgrid load networking switch (1i7) through the i-th microgrid communication network (1i1), thereby forming an independent i-th microgrid system Mi (1i); In each microgrid system M of the microgrid cluster system GM (1), the nth microgrid power supply (1n2), the nth microgrid energy storage system (1n3), and the nth microgrid load (1n4) of the nth microgrid system Mn (1n) are respectively connected to the nth microgrid system power line (1n8) through the nth microgrid power supply networking switch (1n5), the nth microgrid energy storage networking switch (1n6), and the nth microgrid load networking switch (1n7), and the nth microgrid energy management system SEMSn (4n) is respectively connected to the nth microgrid power supply (1n2), the nth microgrid energy storage system (1n3), the nth microgrid load (1n4) and the nth microgrid power supply networking switch (1n5), the nth microgrid energy storage networking switch (1n6), and the nth microgrid load networking switch (1n7) through the nth microgrid communication network (1n1), thereby forming an independent nth microgrid system Mn (1n).

2. According to claim 1, a microgrid cluster system based on single grid-connected power line connection and dynamic networking is characterized in that: The capacity value of each microgrid system M for external interactive energy is the basic information reported by each microgrid system M to the microgrid cluster energy management system GEMS (6) through its own microgrid energy management system SEMS and at least includes the maximum power value of the external interactive energy and the maximum electric quantity value of the primary interactive energy.

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