A microgrid cluster dynamic networking system based on the structure of a single networking connection point

Abstract

The present invention belongs to the technical field of microgrids, and particularly relates to a dynamic networking system for a microgrid cluster constructed based on a single networking connection point structure. For the overall operation resource sharing of a microgrid cluster system formed by connecting multiple dispersed microgrids, which is the application development trend of distributed renewable energy applications, the present invention realizes connecting multiple dispersed microgrids to form a microgrid cluster system and effectively controlling the overall operation and resource sharing of the microgrid cluster system. According to the main technical characteristics and networking features of the microgrid, from the perspective of optimizing the top-level design, the present invention proposes a single networking connection point structure for the microgrid cluster system, as well as an access power control method for dynamic networking and an energy interaction method for application, evaluation, and regulation, realizing the full autonomy and controlled sharing of each microgrid system; providing a feasible solution for the dynamic networking system of the microgrid cluster.

Description

Technical Field

[0001] The present invention belongs to the technical field of microgrids, and particularly relates to a microgrid cluster dynamic networking system based on a single networking connection point structure. Background Art

[0002] With the wide application of new energy, especially distributed renewable energy, the uncertainty and volatility of distributed renewable energy generation have posed great challenges to the stable 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. Since the energy density of distributed renewable energy is relatively low, it is particularly suitable for decentralized installation and local application. Especially in relatively developed urban areas, the shortage of concentrated sites in agriculture, industry, commerce, and education, 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 a region has begun to emerge. It is necessary to study the overall operation resource sharing of a microgrid cluster system composed of multiple decentralized microgrids connected together. This is also a development trend of the application of distributed renewable energy. The microgrid cluster system is a complex system, and currently, there is no mature and effective way to form a microgrid cluster system and operation control method. Summary of the Invention

[0003] In order to connect multiple decentralized microgrids to form a microgrid cluster system and effectively control the overall operation and resource sharing of the microgrid cluster system, according to the main technical characteristics, networking, and operation characteristics of the microgrid, the present invention proposes a microgrid cluster system based on a single networking connection point structure from the perspective of optimizing the top-level design, realizing full autonomy and controlled sharing of each microgrid system; its characteristics are:

[0004] Two or more independent microgrid systems form a microgrid cluster. Each independent microgrid sets one and only one connection point connected to the external power line 11. The single connection points of each independent microgrid are respectively connected to the external power line 11 through controlled switches. Each independent microgrid system has its own microgrid energy management system SEMS and is under the control of the microgrid cluster energy management and control system GEMS13, and electric energy interaction between each microgrid is carried out through the external power line 11.

[0005] The characteristics of each microgrid system are composed of a microgrid single-node connected controlled switch, a microgrid connection power line, a microgrid new energy power source, a microgrid rotor power source, a microgrid energy storage system, a microgrid load device, a microgrid power line of the microgrid power support line, a microgrid cluster communication network, and a microgrid energy management system SEMS.

[0006] The dynamic networking operation control method of the microgrid cluster system based on a single networking connection point structure is as follows:

[0007] 1) The microgrid cluster energy management and control system GEMS13 communicates with each independent microgrid system through the microgrid cluster communication network 12, and each microgrid system has its own microgrid energy management system SEMS to make contact and confirm each microgrid system participating in the microgrid cluster networking;

[0008] 2) The microgrid cluster energy management and control system GEMS13 monitors in real time whether two or more microgrid systems apply to connect to the external power line 11 through their own microgrid energy management systems SEMS;

[0009] 3) No, continue to monitor;

[0010] 4) Yes, compare the two-way interactive power capabilities of each microgrid applying to connect to the external power line 11 and select the microgrid with the largest capability to connect to the external power line 11 first, set the grid connection point to zero power, then connect the other microgrid systems to the external power line 11 one by one and set the grid connection point to zero power to form a dynamic networking system for the microgrid cluster and run;

[0011] 5) The microgrid cluster energy management and control system GEMS13 monitors whether a microgrid system applies for external interactive power. No, continue to monitor;

[0012] 6) Yes, then determine whether it satisfies:

[0013] The total amount of applied interactive power ≥ the sum of the two-way interactive power capabilities of the other microgrids that have not applied for interactive power;

[0014] 7) No, the microgrid cluster energy management and control system GEMS13 issues an instruction to allow interactive power and continues to monitor;

[0015] 8) Yes, then calculate and subtract the excess interactive power and form a new interactive power instruction to be allocated to the corresponding microgrid systems that have applied for interactive power, and each microgrid system that has applied for interactive power executes the new interactive power instruction;

[0016] 9) The microgrid cluster energy management and control system GEMS13 monitors, regulates and maintains in real time:

[0017] The total amount of applied interactive power ≤ the sum of the two-way interactive power capabilities of the other microgrids that have not applied for interactive power;

[0018] When the interactive power application of the microgrid system is completed, or a new application occurs and the application changes, go to 5).

[0019] The present invention proposes a dynamic networking system for a microgrid cluster based on a single networking connection point structure. For the overall operation resource sharing of a microgrid cluster system formed by connecting multiple dispersed microgrids, which is the application development trend of distributed renewable energy applications, it realizes connecting multiple dispersed microgrids to form a microgrid cluster system and effectively controlling the overall operation and resource sharing of the microgrid cluster system. According to the main technical characteristics and networking features of the microgrid, from the perspective of optimizing the top-level design, the present invention proposes a single networking connection point structure of a microgrid cluster system, as well as an access power control method for dynamic networking and an energy interaction method for application, evaluation, and regulation, achieving full autonomy and controlled sharing of each microgrid system; providing a feasible solution for the dynamic networking system of the microgrid cluster. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a control flowchart of a control method for a dynamic networking system of a microgrid cluster based on a single networking connection point structure.

[0021] Figure 2 It is a schematic block diagram of the principle of a dynamic networking system of a microgrid cluster based on a single networking connection point structure, where: external power line 11, microgrid cluster communication network 12, microgrid cluster energy management and control system GEMS 13, first microgrid single-node connection controlled switch 211, first microgrid connection power line 221, first microgrid power line 231, first microgrid SEMS1 energy management system 241, first microgrid communication network 251, first microgrid new energy power supply 311, first microgrid rotor power supply 321, first microgrid energy storage unit system 331, first microgrid load 341, nth microgrid single-node connection controlled switch 21n, nth microgrid connection power line 22n, nth microgrid power line 23n, nth microgrid SEMSn energy management system 24n, nth microgrid communication network 25n, nth microgrid new energy power supply 31n, nth microgrid rotor power supply 32n, nth microgrid energy storage unit system 33n, nth microgrid load 34n. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] As an example of implementation, a dynamic networking system of a microgrid cluster based on a single networking connection point structure is described in conjunction with the accompanying drawings. However, the described embodiments are part of the embodiments of the present invention applied to a dynamic networking system of a microgrid cluster based on a single networking connection point structure of type A, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention. The technology and solutions of the present invention are not limited to the content given in this example of implementation.

[0023] Such as Figure 1As shown in the figure, a dynamic networking system for a microgrid cluster based on a single networking connection point is provided to achieve full autonomy and controlled sharing of each microgrid system. Its characteristics are as follows:

[0024] Two or more independent microgrid systems form a microgrid cluster. Each independent microgrid sets one and only one connection point connected to the external power line 11. The single connection points of each independent microgrid are respectively connected to the external power line 11 through controlled switches. Each independent microgrid system has its own microgrid energy management system (SEMS) and is under the control of the microgrid cluster energy management and control system (GEMS13), and electrical energy interaction between each microgrid is carried out through the external power line 11.

[0025] As Figure 2 shown, the characteristics of each microgrid system are composed of the first microgrid single-node connected controlled switch 211, the first microgrid connected power line 221, the first microgrid power line 231, the first microgrid SEMS1 energy management system 241, the first microgrid communication network 251, the first microgrid new energy power source 311, the first microgrid rotor power source 321, the first microgrid energy storage unit system 331, the first microgrid load 341, the nth microgrid single-node connected controlled switch 21n, the nth microgrid connected power line 22n, the nth microgrid power line 23n, the nth microgrid SEMSn energy management system 24n, the nth microgrid communication network 25n, the nth microgrid new energy power source 31n, the nth microgrid rotor power source 32n, the nth microgrid energy storage unit system 33n, and the nth microgrid load 34n. Among them:

[0026] The first microgrid single-node connected controlled switch 211 is connected to the first microgrid power line 231 through the first microgrid connected power line 221. The first microgrid power line 231 is respectively connected to the first microgrid new energy power source 311, the first microgrid rotor power source 321, the first microgrid energy storage unit system 331, and the first microgrid load 341. The first microgrid SEMS1 energy management system 241 is respectively connected to the first microgrid new energy power source 311, the first microgrid rotor power source 321, the first microgrid energy storage unit system 331, and the first microgrid load 341 through the first microgrid communication network 251; the nth microgrid single-node connected controlled switch 21nn, the nth microgrid connected power line 22n, the nth microgrid power line 23n, the nth microgrid SEMSn energy management system 24n, the nth microgrid communication network 25n, the nth microgrid new energy power source 31n, the nth microgrid rotor power source 32n, the nth microgrid energy storage unit system 33n, and the nth microgrid load 34n;

[0027] The single-node connection controlled switch 21n of the nth microgrid is connected to the nth microgrid power line 23n through the nth microgrid connection power line 22n. The nth microgrid power line 23n is respectively connected to the nth microgrid new energy power source 31n, the nth microgrid rotor power source 32n, the nth microgrid energy storage unit system 33n, and the nth microgrid load 34n. The nth microgrid SEMSn energy management system 24n is respectively connected to the nth microgrid new energy power source 31n, the nth microgrid rotor power source 32n, the nth microgrid energy storage unit system 33n, and the nth microgrid load 34n through the nth microgrid communication network 25n;

[0028] The dynamic networking operation control method of the microgrid cluster system based on the single networking connection point structure is as follows:

[0029] 1) The microgrid cluster energy management and control system GEMS13 contacts the microgrid energy management systems SEMSn of each independent microgrid system through the microgrid cluster communication network 12 to confirm the microgrid systems participating in the microgrid cluster networking;

[0030] 2) The microgrid cluster energy management and control system GEMS13 monitors in real time whether two or more microgrid systems apply to connect to the external power line 11 through their own microgrid energy management systems SEMSn;

[0031] 3) No, continue to monitor;

[0032] 4) Yes, compare the two-way interaction power capabilities of each microgrid applying to connect to the external power line 11, select the microgrid with the largest capability to connect to the external power line 11 first, set the grid connection point to zero power, and then connect other microgrid systems to the external power line 11 one by one and set the grid connection point to zero power to form a microgrid cluster dynamic networking system and operate;

[0033] 5) The microgrid cluster energy management and control system GEMS13 monitors whether there is a microgrid system applying for external interaction power. No, continue to monitor;

[0034] 6) Yes, then judge whether it satisfies:

[0035] The total amount of applied interaction power ≥ the sum of the two-way interaction power capabilities of the other microgrids that have not applied for interaction power;

[0036] 7) No, the microgrid cluster energy management and control system GEMS13 issues an instruction to allow interaction power and continues to monitor;

[0037] 8) Yes, then calculate and subtract the excess interaction power and form a new interaction power instruction to be distributed to the corresponding microgrid systems applying for interaction power, and each microgrid system applying for interaction power executes the new interaction power instruction;

[0038] 9) The microgrid cluster energy management and control system GEMS13 monitors, regulates, and maintains in real time:

[0039] The total amount of applied interactive power ≤ the sum of the two-way interactive power capabilities of the other microgrids that have not applied for interactive power;

[0040] When the interactive power application of the microgrid system is completed, or a new application is generated, or the application changes, go to 5).

[0041] The present invention proposes a dynamic networking system for a microgrid cluster based on a single networking connection point structure. For the overall operation resource sharing of a microgrid cluster system formed by connecting multiple dispersed microgrids, which is the application development trend of distributed renewable energy applications, it realizes connecting multiple dispersed microgrids to form a microgrid cluster system and effectively controls the overall operation and resource sharing of the microgrid cluster system. According to the main technical characteristics and networking features of the microgrid, from the perspective of optimizing the top-level design, the present invention proposes a single networking connection point structure of the microgrid cluster system, as well as an access power control method for dynamic networking and an energy interaction method for application, evaluation, and regulation, realizing the full autonomy and controlled sharing of each microgrid system; providing a feasible solution for the dynamic networking system of the microgrid cluster.

Claims

1. A microgrid cluster system based on a single networking connection point structure realizes full autonomy and controlled sharing of each microgrid system; its characteristics are as follows: Two or more independent microgrid systems form a microgrid cluster. Each independent microgrid sets one and only one connection point connected to the external power line 11. The single connection points of each independent microgrid are respectively connected to the external power line 11 through controlled switches. Each independent microgrid system has its own microgrid energy management system SEMS and is under the control of the microgrid cluster energy management and control system GEMS13, and electrical energy interaction between each microgrid is carried out through the external power line 11. Among them, the characteristics of each microgrid system are composed of a microgrid single-node connected to a controlled switch, a microgrid connected to a power line, a microgrid new energy power source, a microgrid rotor power source, a microgrid energy storage system, a microgrid load device, a microgrid power line of a microgrid power support line, a microgrid cluster communication network, and a microgrid energy management system SEMS. The dynamic networking operation control method of the microgrid cluster system based on a single networking connection point structure is as follows: 1) The microgrid cluster energy management and control system GEMS13 contacts with the microgrid energy management system SEMS of each independent microgrid system through the microgrid cluster communication network 12 to confirm each microgrid system participating in the microgrid cluster networking. 2) The microgrid cluster energy management and control system GEMS13 monitors in real time whether two or more microgrid systems apply to connect to the external power line 11 through their own microgrid energy management system SEMS. 3) If not, continue to monitor. 4) If so, compare the two-way interaction power capabilities of each microgrid applying to connect to the external power line 11 and select the microgrid with the largest capability to access the external power line 11 first, and set the grid connection point to zero power. Then, connect other microgrid systems to the external power line 11 one by one and set the grid connection point to zero power to form a microgrid cluster dynamic networking system and operate. 5) The microgrid cluster energy management and control system GEMS13 monitors whether a microgrid system applies for external interaction power. If not, continue to monitor. 6) If so, then determine whether it satisfies: The total amount of applied interaction power ≥ the sum of the two-way interaction power capabilities of the remaining microgrids that have not applied for interaction power; 7) If not, the microgrid cluster energy management and control system GEMS13 issues an instruction to allow interaction power and continues to monitor. 8) If so, calculate and subtract the excess interaction power and form a new interaction power instruction to be distributed to the corresponding microgrid systems applying for interaction power. Each microgrid system applying for interaction power executes the new interaction power instruction. 9) The microgrid cluster energy management and control system GEMS13 monitors and regulates in real time and maintains: The total amount of applied interaction power ≤ the sum of the two-way interaction power capabilities of the remaining microgrids that have not applied for interaction power; When the interaction power application of the microgrid system is completed or a new application and the application changes occur, go to 5).

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