摘要
为解决变速恒频风机运行中转子侧功率变化频繁,直流母线电压波动剧烈的问题,对双PWM变换器控制策略进行了研究。结合双馈电机的特点,得出了母线负载电流的计算方法,并分析了负载电流前馈策略的不足。提出了一种基于动态功率前馈的新型协调控制策略,特点在于选择控制电压节点作为前馈补偿点,避免了电流环的迟延,并且将双馈电机动态信息整合进入网侧变换器的控制当中。最后建立双PWM励磁的风电机组模型进行仿真验证,结果表明新策略极大改善了直流母线动态特性,因此降低了对变换器中电解电容容量的要求,提高了机组的可靠性。
As rotor-slde power changes frequently during variable-speed constant-frequent （VSCF） wind generation operating, which causes dc-bus voltage fluctuation,the dual PWM converters control strategy is researched. Combined with the doubly-fed induction generator （DFIG） characteristics, the load current is obtained. Based on analyzing of load current feed forward strategy, a novel coordinated control strategy is proposed, in which a feed-forward compensation is injected at control voltage node to avoid the current control loop delay, as well as the DFIG dynamic information is fully utilized by converter control system. Finally, The wind generation system model with dual PWM converters is established, simulation result indicates that the novel strategy improved the dc-bus dynamic characteristics. Therefore, the electrolytic capacitor capacity can be reduced, which enhance the wind generation system reliability effectively.
出处
《华北电力技术》
CAS
2008年第1期1-5,共5页
North China Electric Power
基金
国家自然科学基金项目(50677021)
教育部重点项目(105049)
