摘要
新的电网规则要求风力发电系统具有低电压穿越能力,直驱式风电系统通过增加Crowbar保护电路,可以极大地提高其故障穿越能力。基于对适用于直驱式风电系统Crowbar保护电路的总结,对常用的Crow-bar保护方案进行了分类,对其工作原理和实现方法进行了详细说明,并讨论了各自的优缺点。分析表明,直流侧Crowbar保护电路是优选方案,具有较低的成本和较高的可靠性;串联辅助变换器Crowbar保护电路补偿性能好,响应速度快,具有良好的应用前景。
New power grid regulation requires WTG systems have low voltage fidethrough （LVRT） capability. By adding Crowbar protection circuits, the fault ride through capability of direct drive WTG systems can be greatly improved. This paper summarizes Crowbar protection circuits, categorizes commonly used for Crowbar protection schemes, elaborates on their principles and realizations, as well as discusses their own advantages and disadvantages. Analysis shows that Crow circuits are preferred in DC side and have low cost and high reliability; series auxiliary converter Crowbar circuits have favorable compensation performance, fast response and good prospects.
出处
《电力建设》
2007年第9期44-47,共4页
Electric Power Construction
基金
中国博士后科学基金项目
项目编号:20060390092
关键词
直驱式风电系统
变速恒频
电网电压跌落
低电压穿越
CROWBAR电路
direct- drive WTG system
variable speed constant frequency
grid voltage drop
low vohage ride through
Crowbar circuit
