摘要
由于电网中电压凹陷发生的时间不多,动态电压恢复器(DVR)通常都处于备用状态。为了提高动态电压恢复器的效率,提出了静止坐标下的谐振控制器,避开复杂的坐标变换方法简单地检测出指定次数的谐波。应用这种静止坐标下的谐振控制器对指定次数的谐波电压进行闭环控制,使DVR具备补偿谐波电压的功能,而对基本DVR的电压凹陷补偿性能的影响很小。还提出了应用δ算子实现谐振控制的途径,提高了DVR的效率。通过M ATLAB仿真表明该方法可以消除指定次数谐波的绝大部分。
Dynamic voltage restorer always keeps a standby status since vohage sags are rarely happened in power systems. To improve the efficiency of DVR, a stationary frame resonance controller is proposed. Through analyzing its frequency response, selected harmonics are easily detected without complicated transform. Using this resonance controller to take a closed loop control to selected harmonic voltage makes DVR with a function of harmonic voltage compensation,which has little influence on DC link voltage. A way of realizing resonance controller using δ operator is presented to improve digital filter performance. Simulation results show that the proposed method can reduce most selected harmonics.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2006年第5期31-36,共6页
Proceedings of the CSU-EPSA
关键词
谐波电压
动态电压恢复器
谐振控制器
harmonic voltage
dynamic voltage restorer （DVR）
resonance controller
