Island stability control method of flexible DC applied to electromagnetic looped network

Abstract

The invention discloses an island stability control method of flexible DC applied to an electromagnetic looped network. The control method relates to coordination control and action sequence cooperation of the flexible DC and a second defense line and a third defense line. The method comprises the steps of firstly, estimating an active balance of a system on the basis of the frequency changing rate at a fault island moment, judging and confirming implementation of stability control measures of the flexible DC and the second defense line according to the active balance and complementing an implementation deviation of the second defense line measure by use of the characteristic that island frequency voltage can be dynamically regulated by the flexible DC in a bidirectional manner; and finally restoring the stability of an island system through the coordination control of the flexible DC and the third defense line for the condition that the stability of the system still cannot be restored after the coordination control of the second defense line and the flexible DC. By the island stability control method, the quantity of implementing measures of the second defense line and the third defense line is reduced and the implementing measures of the second defense line and the third defense line are continuous and controllable, so that the island frequency voltage stability and the operating economy are improved.

Description

technical field [0001] The invention belongs to the technical field of power system operation control, and in particular relates to an island stability control method that is directly applied to an electromagnetic ring network. Background technique [0002] The operation mode of the electromagnetic ring network makes it difficult to control the flow distribution of the high-voltage and low-voltage sides, and cannot make full use of the transmission capacity of the high-voltage side lines. It will also cause problems such as large short-circuit current of the busbar and difficult protection adjustment. In addition, when the high-voltage side is interrupted by a fault, the power flow transfer will cause the low-voltage side line to be overloaded, the voltage of some stations will drop, and even voltage collapse and generator power angle instability will occur. The "Guidelines for the Safety and Stability of Electric Power Systems" clearly points out that: With the gradual cons...

AI Technical Summary

Problems solved by technology

At present, there are few applications and researches on the coordinated control measures of flexible DC and stable control in the electromagnetic ring network.

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