摘要
我国风电在实现跨越式发展的同时,也给电网稳定性带来了很大冲击,因此系统对于风机并网的要求越来越高,这其中最具挑战性的就是低电压穿越特性(LVRT)。首先介绍了双馈异步发电机的基本特点、低压穿越问题和我国电网规程对该特性的要求。最后详细分析了目前国内外主要的LVRT实现技术,并对不同的方案对比分析,指出Crowbar电路、基于励磁控制和附加设备的LVRT技术以及变桨距角调节系统应该配合使用,才能达到更好的控制目标。
Wind power in our country has been developed rapidly, but it also brought serious impacts on power system stability. Therefore, more strict requirements are requested for wind power integration to the system. Among these, low voltage ride-through （LVRT） is regarded as the most challenging. So the characteristics of doubly-fed induction generator, low voltage ride-through and the requirements of grid codes in our country are introduced in this paper. And then. key LVRT technologies and the differences be- tween them are analyzed in detail. According to the comparison, it is concluded that to achieve a better control quality, the Crowbar circuit and the LVRT technology based on excitation control and additional equipments, as well as the pitch angle control system should cooperate with each other.
出处
《东北电力技术》
2012年第12期1-5,共5页
Northeast Electric Power Technology
