随着并网规则的日益严格,保证风力发电机组在电网电压短时跌落时不解列,已成为一个强制性问题.此处首先研究了双馈感应电机(DFIG)在电网电压跌落时定子电流的电磁暂态过渡过程,并对其进行了仿真频谱分析,进而提出考虑定子励磁电流动态过渡过程的DFIG低电压穿越(LVRT)控制策略,并与传统矢量控制策略进行仿真对比分析,改进控制策略可有效抑制转子侧冲击电流,提高系统不间断运行能力.最后,通过实验证明了所用控制方案的可行性与有效性.%With the grid-connected rules is increasingly severe,it has become a mandatory problem that ensuring the wind power unit is not out-of-step under grid voltage dip.The electromagnetic transient process is firstly analysed un der grid voltage dip,the simulation spectrum analysis is done,and the low voltage ride through(LVRT) control strate gy based on considering stator electromagnetic transient process is proposed.The simulation analysis shows that the improved control strategy can restrain the rotor current impact effectively, increase the uninterrupted operation ability of doubly-fed induction generator (DFIG) under grid voltage dip.Finally ,the experimental results verify the feasibility and effectiveness of the proposed control strategy.
展开▼
