Effects of Dynamic Reactive Power Compensation on Wind Farm Transient Voltage and Its Control Strategy Research

doi:10.3969/j.issn.1000-7229.2015.08.020

Abstract

Abstract:

In recent years, large-scale wind turbine tripping accidents occur frequently, causing a serious threat to the security and stability of power grid. Its necessary to study the mechanism of these accidents and propose strategy to prevent more accidents. This paper firstly analyzed the high voltage problem of wind machines with dynamic reactive power compensation devices during grid fault, and put forward simulation to study the impact of SVC （static var compensator） response time on the transient voltage characteristics of wind farms. The results point out that the adjustment lag of SVC transient reactive power is the main factor leading to wind turbine tripping accidents caused by high voltage under fault. Then the reactive power coordination control strategy was proposed for wind farms during grid fault, which through coordinating SVC and wind turbines reactive power output, could peremptorily lock SVC when the fault occurred and put crowbar into operation to protect circuit, and then make SVC back into operation with a certain time delay after the fault clearance, so as to improve the fault crossing ability of wind turbines. The simulation results show that the proposed control strategy can effectively suppress wind turbine high-voltage tripping accidents caused under fault.

Key words: wind farms, reactive power control strategy, static var compensator （SVC）, response time, high voltage offline

CLC Number:

TM 614

LYU Qingjie, XU Zheng, LI Hui, XIAO Jinyu, WANG Shuai. Effects of Dynamic Reactive Power Compensation on Wind Farm Transient Voltage and Its Control Strategy Research[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(8): 122-129.

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