Distributed control method for isolated microgrid
A distributed control and distributed controller technology, applied in the direction of electrical components, circuit devices, single-network parallel feeding arrangements, etc., can solve the problems of low accuracy of autonomous control power distribution, poor reliability and scalability, and unreliable centralized control. Advanced issues, to achieve the effect of plug and play, less communication lines and traffic, and high reliability
Active Publication Date: 2019-01-01
SOUTHEAST UNIV
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Problems solved by technology
Although the centralized method has high adjustment accuracy, due to the existence of a central controller, the reliability and scalability are poor
Autonomous control is based on local information control, without communication network, high robustness, but low power allocation accuracy
[0004] The distributed control method utilizes a sparse communication network, and there is no central controller, which overcomes the disadvantages of low reliability of centralized control and low precision of autonomous control power distribution
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[0036] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.
[0037] 1. The present invention discloses a distributed control method for an isolated microgrid, which is suitable for an AC microgrid whose line impedance is mainly resistive.
[0038] (1) Add a distributed sparse communication network based on the original microgrid control architecture, such as figure 1 As shown, the network is characterized in that each node has the same status, there is no dominant node, only adjacent nodes communicate, and there are fewer communication lines.
[0039] (2) Each distributed power supply is equipped with a distributed controller, which uses the sparse communication network to exchange voltage and frequency information with neighboring controllers, and obtains the average voltage and average frequency of the entire network through a consensus algorithm, and outputs it to the secondary controller Perform secondary...
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The present invention proposes a distributed control method for an isolated microgrid, which allocates a distributed controller for each distributed power source, only needs to exchange voltage and frequency information between adjacent controllers, and uses the consensus algorithm to evaluate and obtain the average value of the entire network. Voltage and frequency information are used for secondary optimization control. By optimizing the reference voltage and frequency of droop control, the output active power of each distributed power supply is accurately allocated in proportion to the rated capacity, and the system voltage regulation and frequency regulation are carried out; Compared with this method, the sparse communication network without central nodes can realize the "plug and play" of distributed power supply, and the proportional control of power can be realized only by exchanging voltage information, with fewer communication lines and communication traffic. The communication line requirement is low, and the reliability of the method is high.
Description
Technical field [0001] The invention belongs to the technical field of micro-grid and inverter control and optimization, and relates to a distributed control method for an isolated micro-grid. Background technique [0002] When the microgrid operates in isolation and autonomously, multiple distributed power sources often operate in parallel through power electronic devices to improve the reliability of system power supply. The coordinated control strategy among distributed power sources not only affects the stability of the system, but also affects the operating efficiency of the system. Therefore, the problem of multi-machine parallel coordinated control of isolated microgrids has attracted widespread attention. [0003] Isolated microgrids generally adopt a hierarchical control architecture, and the primary control usually adopts droop control to realize basic voltage and frequency adjustment, so that the distributed power supply has the function of "plug and play". Due to the ...
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IPC IPC(8): H02J3/46H02J13/00
CPCH02J13/0079H02J3/46Y04S10/12Y02E40/70Y04S10/50
Inventor 吴在军苏晨吕振宇窦晓波胡敏强
Owner SOUTHEAST UNIV