Cooperation protection method of UPFC device and electric power system

Abstract

The invention discloses a cooperation protection method of a UPFC device and an electric power system. The body of the UPFC device is divided into a parallel-side alternating current protection area,a series-side alternating current protection area, an inverter and a direct current protection area. An above uncovered system protection area is set to be the uncovered system protection area. Parallel transformer protection is performed on the parallel-side alternating current protection area. Series transformer protection is performed on the series-side alternating current protection area. A blocking valve and a mode of tripping off a condition of taking an adjacent low-voltage switch as a main portion are performed on the inverter and the direct current protection area. For the uncovered system protection area, short lead protection is adopted to combine with line protection, and the line protection is moved to a position where the UPFC device does not cover. By using the method, a power failure range caused by a UPFC fault is reduced, a protection dead area is avoided, the operation stability of the UPFC device is increased, fault processing time is shortened, and the operation mode of the UPFC device is flexible.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for using UPFC to cooperate with the protection of an electric power system. Background technique [0002] The Unified Power Flow Controller (Unified Power Flow Controller, hereinafter referred to as UPFC) is a new type of power flow control device composed of a parallel-compensated STATCOM and a series-compensated SSSC. It can separately or simultaneously realize the functions of several different FACTS components such as parallel compensation, series compensation and shifting only by changing the control law. [0003] The research on the protection of the UPFC equipment body in the prior art is relatively mature. But the application of UPFC in the power grid is only in the trial stage. Since there are many devices in UPFC, how to improve the stable operation of UPFC in the power system remains to be studied continuously. [0004] Such as figure 1 As shown, ...

AI Technical Summary

Problems solved by technology

Based on this logic, UPFC failure or maintenance will inevitably lead to the start of line protection action, cut off the entire line, and affect the stable operation of the overall power grid

[0007] In view of the complexity and diversity of UPFC devices and the special variability of wiring, the system treats UPFC devices as a single conventional power component, which will cause many disadvantages and reduce the reliability of power grid operation.

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