摘要
在电网电压不对称时,直驱型永磁同步风电机组采用对称控制方法将造成直流侧电压的波动。根据风电机组变流器输出瞬时功率与直流电容电压波动之间的关系,提出一种保持网侧变流器输出功率恒定的控制策略。讨论了风电机组并网对系统不平衡度的影响,以及网侧变流器控制系统的实现。仿真结果表明,电网电压不对称时该控制策略能够保证直流电容电压保持恒定,三相输出电流为正弦波形。
when network voltage is asymmetrical,direct-driven PMSM under the symmetrical control policy can cause the current fluctuation on direct current（DC） side.Based on the relationship between transient output capacity of wind generator unit converter and DC capacitor voltage fluctuation,a control policy to keep the output capacity of converter on network side constant is proposed.Influence of wind generator unit connection to the network on system unbalance is discussed,implementation of converter control system on network side is presented.The simulation shows that,when network voltage is asymmetrical,this control policy can keep the DC capacitor voltage constant,and 3-phase output current wave is sinusoidal.
出处
《供用电》
2011年第6期48-52,共5页
Distribution & Utilization
关键词
风力发电
电压不对称
输出功率恒定
电压波动
wind generation
asymmetrical voltage
constant output capacity
voltage fluctuation
