摘要
研究了基于DC-Link保护回路的直驱风机在电网故障状态下的低电压穿越特性。研究了国家标准GB/T19963-2011对风机低电压穿越能力的要求。结合直驱永磁风力发电机组(PMSG)风机运行原理,构建了PMSG在PSCAD环境下的系统控制模型。结合电网三相对称短路故障,对加装和未加装DC-Link保护回路的PMSG的LVRT特性进行了分析和比较。仿真结果不仅证明了所用系统模型是合理的,控制策略是有效可行的,而且还表明加装DC-Link保护回路的PMSG具备较为优越的低电压穿越特性。
The low voltage ride through（LVRT） characteristics of permanent magnet synchronous generator（PMSG）based on DC-Link protection circuit during grid faults were studied. The demands of Chinese new national grid code GB/T 19963-2011 for LVRT characteristics of wind turbine were analyzed. Combined with the operating theory of PMSG wind turbine, system control model of PMSG was built under PSCAD conditions. The LVRT characteristics of PMSG with and without DC-Link protection circuit were analyzed and compared throurh three-phase symmetrical short-circuit faults on grid side. Simulation results show that the models and control methods are correct and valid,and show that PMSG equipped with DC-Link protection circuit has predominant LVRT capability.
出处
《电源技术》
CAS
CSCD
北大核心
2014年第5期906-908,980,共4页
Chinese Journal of Power Sources
