电网故障下直驱永磁风力发电机组机侧变流器改进控制策略  

Improved machine-side converter control strategy of direct-drive permanent magnet synchronous generator for wind power system during grid failures

作　　者：王海鑫[1] 杨俊友[1] 李欣[1] 邢作霞[1] 崔嘉[1] 李连富 王宇帆[3] 李春来[4] 

机构地区：[1]沈阳工业大学电气工程学院,辽宁沈阳110870 [2]中电投东北电力有限公司,辽宁沈阳110181 [3]东北电力大学自动化工程学院,吉林吉林132012 [4]国网青海省电力公司电力科学研究院,青海西宁810008

出　　处：《可再生能源》2015年第11期1632-1639,共8页Renewable Energy Resources

基　　金：国家自然科学基金(51075281);沈阳市科技计划项目(160325);中电投科技项目(CPINEDCSJ-201408-18);辽宁省特聘教授专项基金(辽教发[2012]145号);光伏等多类型能源微网多模式运行控制策略研究(2014-Z-Y34A);青海省光伏发电并网技术重点实验室(2014-Z-Y34A)

摘　　要：文章对电网电压跌落时的直驱永磁同步风力发电机组的低电压穿越过程进行深入研究,在电网电压跌落时,通过分析发电机机侧变流器最大风能跟踪控制策略,提出一种补偿q轴电流参考值抑制直流母线电压的新方法,并加入弱磁控制,使发电机输出功率迅速有效降低,进而维持机侧与网侧变流器的功率平衡及母线电压稳定。电网持续故障且超出规定时间时,为风电机组增加了卸荷电路,保证机组安全退出运行。分析结果验证了所提方案的正确性和有效性。In order to enhance operational ability of direct-driven permanent magnet synchronous generator （DPMSG） during grid failures,the low voltage ride through of DPMSG was deeply re- searched. The control strategy of maximum wind-power tracking of machine-side converter was analyzed. A new method of compensating current reference of q-axis was proposed to restrain DC bus voltage under grid voltage drops meanwhile the weakening field control was used, which reduced gen- erator output power and balanced the power between machine-side converter and grid-side converter. An unloading circuit was added to ensure that the DPMSG ceases operation safely at the case of con- tinuous grid failure and beyond the prescribed time. Simulation results demonstrate the correctness and practicability of the proposed method.

关 键 词：直驱永磁风力发电机 电流补偿 电压跌落 低电压穿越 

分 类 号：TM615[电气工程—电力系统及自动化]