摘要
直接电流控制在应用于并联型电能质量控制器的控制系统时,电流环跟踪存在很大误差,但是补偿效果好。对此现象进行分析:电流跟踪误差由电源电压引起,是与电源电压同相位的有功电流,不影响无功和谐波电流的补偿效果;电流跟踪误差影响系统动态过程,产生冲击电流。提出一种启动过程放电来抑制冲击电流的方法。仿真和实验验证了对电流跟踪误差的分析结论的正确性,也验证了抑制动态冲击电流方法的正确性,完善了电流环的工程设计方法。
In practical applications of shunt power quality controllers with direct current control, very often a quite significant command-tracking error exists in the current control loop while the actual output current of the converter is still satisfactory. Analysis and design considerations were carried out to investigate this confusing issue. The control error is caused by the influence of the source voltage. The error is an active current. The current tracking error produces over-shoot current in the dynamic process. A method of discharging the DC side voltage was presented to suppress the over-shoot current. Both simulation investigations and hardware experimental results were finally provided to verify the analysis and specification. Based on the conclusions, the understanding of the current loop is more clearly, and the design of the current loop is more optimal.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第34期57-62,共6页
Proceedings of the CSEE
基金
"十一五"国家科技支撑计划重点项目(2007BAA12B03)~~
关键词
电能质量
电压型变流器
直接电流控制
跟踪误差
power quality
voltage source converter
direct current control
tracking error
