Research and Verification of LVRT Control Techniques for Direct-Drive Wind Turbines

doi:10.11930/j.issn.1004-9649.2013.11.100.4

Abstract

Abstract: With large-scale wind power integration in the power grid, the new grid codes for wind power integration require the wind turbines to have the capability of low voltage ride through(LVRT). For direct-drive wind turbine units, the DC bus chopper resistance is applied to limit the over-voltage in the current transformer when voltage falls, and an improved current control strategy is adopted to restrain the over-current. In this way, the LVRT operation of a permanent magnet synchronous generator (PMSG) is achieved. In this paper, the design of the chopper resistance is optimized based on the mathematic model of the grid side converter (GSC) and an improved current control strategy is proposed to regulate the over current of the GSC under grid voltage drop. In the end, the LVRT capability is tested on a 1.5 MW permanent magnet synchronous generator wind turbine to validate the correctness of the proposed design techniques.

Key words: wind power, low voltage ride through, control strategy, testing, direct-drive permanent magnet synchronous generator, chopper resistance

CLC Number:

TM614

ZHENG Xiang-yu, SHEN Wei-cheng, LI Cheng, LIU Xiu-liang, LI Zhen. Research and Verification of LVRT Control Techniques for Direct-Drive Wind Turbines[J]. Electric Power, 2013, 46(11): 100-104.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2013.11.100.4

https://www.electricpower.com.cn/EN/Y2013/V46/I11/100

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