摘要
为了减少SVG系统的低次谐波含量、提高其补偿容量,并避免传统的SVG系统采用的复杂的多重化结构和开关器件的串并联带来的均压均流问题,文中提出了一种新的SVG系统结构。该系统基于瞬时无功理论,采用电流控制电压源的控制策略,借助特殊变压器,利用空间电压矢量法产生触发信号,实现多目的补偿。仿真与实验结果表明,该系统可以很好地补偿系统的无功和谐波电流,并且在发生单相接地故障时仍能发挥补偿作用。
In order to reduce the low-order harmonic and increase the compensation capacity, a new configuration of the SVG system has been proposed in this paper, without using the multi-inverter or the series-connected devices technique which always be used in the traditional SVG system. However, a multi-inverter usually has a complex configuration and it is also very difficult to make the voltage and current of each device equal in the series-connected devices technique. Based on the instantaneous reactive power theory and the current controlled Voltage Source eontrol strategy, the SVG system operates for the multi-compensation, by using the special transformer, and the driving pulse is generated based on the space voltage vector PWM. The simulated and experimental results show that good compensation of the reactive and harmonic current can be gotten no matter if there will he single-phase earth fault or not.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2011年第6期16-21,共6页
Proceedings of the CSU-EPSA
基金
国家自然科学基金资助项目(51077044)
教育部留学回国人员科研启动基金(20091341)
关键词
无功补偿
逆变器
变压器
空间电压矢量
单相接地故障
compensate reactive power
inverter
transformer
space vector pulse width modulation
singlephase earth fault
