摘要
提出了一种基于不对称级联型多电平逆变器(ACMI)的动态电压恢复器(DVR)及其控制策略。该DVR在结构上采用不对称级联型多电平逆变器,易于实现装置的大容量化;控制策略上先采用跌落前电压补偿法,然后平缓过渡到同相位电压补偿法,在这种控制策略下,系统电压发生幅值和相位跳变时,能够保证负载电压平滑无突变,减小了对相位突变敏感负荷的影响,补偿效果接近跌落前电压补偿法,而所需补偿的能量与同相位电压补偿法接近。Matlab仿真试验验证了该系统结构和控制策略的实用性、有效性。
This paper presents a dynamic voltage restorer （DVR） based on asymmetry cascade multilevel inverter （ACMI） and its control strategy. The asymmetry cascade multilevel inverter is used in this DVR, so the capacity of the DVR can be made very large. The control strategy is based on a combination of pre-sag phase compensation and post-sag phase compensation. Once a sag event occurs, the phase will therefore slowly shift from the pre-sag phase to the post-sag phase, so the voltage as seen by the load will be smooth without any sudden jump. This gives the benefit of the load which is sensitive to the voltage phase. The effect of the DVR is close to the pre-sag phase compensation, but the consumption of energy is close to the post-sag phase compensation. The practicability and validity of the structure and control strategy are confirmed by MATLAB simulation.
出处
《继电器》
CSCD
北大核心
2007年第13期49-52,60,共5页
Relay
