Microgrid wide-area current protecting system and method based on multi-Agent technology

Abstract

A microgrid wide-area current protecting system and method based on the multi-Agent technology belongs to the technical field of microgrid protection. The system is composed of an intelligent electronic equipment layer, an area control and protection coordinating layer and a central processing layer, wherein the intelligent electronic equipment layer is composed of intelligent electronic devices (IED) configured on every breaker in a microgrid, and every IED comprises a state monitoring Agent, a measuring Agent, an network topology Agent and a protecting Agent; the area control and protection coordinating layer comprises an area control Agent and a protection coordinating Agent; the central processing layer comprises a central processing Agent. According to the microgrid wide-area current protecting system and method based on the multi-Agent technology, the microgrid current protecting range is divided through an improved taboo fusion breadth searching algorithm, gives full play to the advantage of a taboo algorithm capable of eliminating local optimization, makes full use of the advantages of wide search range and high efficiency of a breadth search algorithm and overcomes refusal operation and maloperation of the IEDs through a method of enlarging the current protecting range, thereby being capable of accurately and rapidly cutting off faults inside the microgrid.

Description

Technical field [0001] The invention belongs to the technical field of micro-grid protection, in particular to a micro-grid wide-area current protection system and method based on multi-Agent technology. Background technique [0002] The microgrid provides effective technical means for the full application of distributed power by constructing a miniature low-voltage power distribution system composed of a series of distributed power (DG), energy storage systems and loads. At the same time, the relatively complex electrical characteristics inside the microgrid: the direction of the internal flow of the microgrid is not fixed, and there are two operating modes of the microgrid: grid-connected and isolated. The bidirectional power flow characteristics of the microgrid make it difficult to achieve the selectivity of microgrid protection; grid-connected operation and island operation are faced with a large difference in short-circuit fault current. In addition, the "plug and pla...

AI Technical Summary

Problems solved by technology

However, the research on these microgrid protection methods is limited to a specific microgrid structure model, which is not extensive, and for wide-area current protection, the range of receiving fault information is not as large as possible. The reasons are as follows: First, relay protection The rapidity requirements make it insufficient time to receive and process a wide range of fault information; second, the fault disturbance only affects a limited local area, and the fault information in this range is crucial to fault judgment, while the information outside the fault is not. It is too important, so how to divide the scope of protection is a problem that needs further research

And there is also the problem of how the IED associated with the intelligent electronic device (IED) acts when it refuses to move or malfunctions

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