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Distributed control method for isolated micro grid

A distributed control and distributed controller technology, which is applied in the direction of electrical components, circuit devices, single-network parallel feeding arrangements, etc., can solve the problem of low accuracy of autonomous control power distribution, poor reliability and scalability, and unreliable centralized control. Advanced problems, to achieve the effect of low requirements, less communication lines and traffic, and high reliability

Active Publication Date: 2016-03-09
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

Method used

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  • Distributed control method for isolated micro grid
  • Distributed control method for isolated micro grid
  • Distributed control method for isolated micro grid

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Embodiment Construction

[0036] The specific embodiments of the present invention will be further described below in conjunction with 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 on the basis of the original microgrid control architecture, such as figure 1 As shown, the network is characterized by the fact that each node is equal, there is no dominant node, and only adjacent nodes communicate with each other, and there are fewer communication lines.

[0039] (2) Each distributed power supply is equipped with a distributed controller, which uses a sparse communication network to exchange voltage and frequency information with adjacent controllers, obtains the average voltage and average frequency of the entire network through a consensus algorithm, and outputs them to the secondary co...

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Abstract

The invention provides a distributed control method for an isolated micro grid. The method distributes a distributed controller for each distributed power supply, and only interactive voltage and frequency information between adjacent controllers are needed; a consistency algorithm evaluation is used to obtain average voltage and frequency of the whole network and is used for secondary optimal control; by optimizing reference voltage and frequency of droop control, each distributed power supply can output active power accurately according to a rated capacity proportional distribution, and system voltage regulation and frequency modulation are performed. Compared with the prior art, by using a sparse communication network without a center node, the method provided by the invention can realize the plug and play of the distributed power supply, and proportional control of power can be realized only through interactive voltage information; besides, the communication lines and communication traffics are less, the demand on the communication lines 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 independently and independently, multiple distributed power sources often operate in parallel through power electronic devices to improve the reliability of the 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 microgrid has received extensive attention. [0003] The isolated microgrid generally adopts a hierarchical control architecture, and the first-level control usually adopts droop control to realize basic voltage and frequency regulation, so that the distributed power supply has the function of "plug and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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
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