小型风力发电机组电压稳定性影响因素研究

Research on influencing factors of voltage stability for small wind turbines

以一系列小型风力发电机组为研究客体,拟主要应用DH5902数据采集分析系统对发电机电压信号数据采集,进而根据IEC标准和国家标准计算相关电压稳定性指标,研究预得到电压稳定性的主要影响因素,给予小型永磁风力发电机电压稳定性优化切实根据。研究显示:低转速超负荷运行可使永磁发电机电压波动和电压偏差程度显著升高,故限制转速是提升电压稳定性的有效举措;再者电压稳定性各指标受发电机绝缘老化和退磁影响复杂,可使得气隙磁场谐波含量增大而电压偏差恶化但电压波动减弱。

This study provides a series of small wind turbines as the research object. The data acquisition and a- nalysis system especially DH5902 are adapt to collect voltage data, and according to IEC standards and national standards the indexes of voltage stability are calculated. The study would give the influencing factors of voltage sta- bility, so that the practical basis can be provided for voltage stability improvement of small permanent magnet wind turbines. It shows that the low speed or overload operation could lead to voltage fluctuation and voltage deviation easily. Therefore, limited speed is reasonably necessary for voltage stability optimization. In addition, the insulation ageing and the demagnetization make the voltage stability indicators vary complicatedly, and make the harmonic con- tent of gap magnetic field increase, so that the voltage deviation has worsened and the voltage fluctuation has de- creased.