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Research and Verification of LVRT Control Techniques for Direct-Drive Wind Turbines
Author(s): ZHENG Xiang-yu, SHEN Wei-cheng, LI Cheng, LIU Xiu-liang, LI Zhen
Pages: 100-
104
Year: 2013
Issue:
11
Journal: Electric Power
Keyword: wind power; low voltage ride through; control strategy; testing; direct-drive permanent magnet synchronous generator; chopper resistance;
Abstract: 随着风电大规模接入电网,新的并网规范要求风力发电机组必须具有低电压穿越能力.针对直驱式风电机组,采用直流母线卸荷电阻限制电压跌落时变流器直流环节产生的过电压,并通过改进电流控制策略抑制变流器过电流,从而实现永磁同步发电机风电机组的低电压穿越运行.在网侧变流器数学模型的基础上进行了卸荷电阻的优化设计,提出了电网电压跌落故障时网侧变流器的改进电流控制策略,最后在1.5 MW级永磁同步发电机风电机组上进行现场低电压穿越能力测试,实测验证了所提出方法的正确性.
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