双馈发电机组机端电压故障衰减特性

Attenuation Characteristics of Fault Generator Voltage of Doubly Fed Induction Generator

随着环境污染和能源问题的日渐加重,风能作为一种清洁能源备受大家青睐。为了提高大规模风电并网的电力系统运行的安全可靠性,研究双馈风电机组DFIG的电压故障特性至关重要。基于DFIG的五阶二轴模型,针对故障发生、撬棒电阻立刻投入这一工况,推导出了DFIG故障电压的近似表达式,得出其正比于转子磁链。于是从转子磁链入手,分析出了故障电压的衰减特性,得出若撬棒电阻阻值越小,转差越小,故障电压衰减越缓慢的结论,最后通过仿真进一步验证了推导的正确性。

With the environmental pollution and energy issues becoming serious,wind as a kind of clean energy attract our attention. In order to improve the safety and reliability of the power system with large scale wind power been connected,it is very important to study the fault characteristics of DFIG. Based on the DFIG five order two axis model,this paper derived the approximate expression of DFIG fault voltage,which is proportional to the rotor flux. So the attenuation characteristics of fault voltage is analyzed based on the rotor flux. The smaller the crowbar resistance and the slip are,the slower the fault voltage decays. The correctness of the theoretical analysis is validated by simulation.