摘要
分析了 GTO死区存在严重恶化 SVG输出电压的原因 ;提出了一种有效的补偿死区的方法 ,该方法不需要实时判断系统电压和电流的方向来实时改变补偿死区的规律 ,而是根据 SVG自身的运行特点 ,提出一种判断 SVG输出无功的方向 (可通过简单地判断 SVG输出电压与系统电压之间的角度δ的方向来实现 ) ,即可离线设置两个方向上的死区补偿的角度修正值Δδ,从而方便地实现死区补偿的方法。该方法不仅有效地减小了 SVG输出电压的失真度 ,还可节省大量的 CPU运行时间 ;在± 50 0 kvar SVG上进行试验 。
Functions of the control system for a ±500 kvar SVG are described. The reasons for the voltage distortion caused by dead zone time of switch device GTOs of voltage source inverters in the ±500 kvar SVG are analyzed. Moreover, an effective method to compensate the dead zone for reducing its influence on the voltage distortion is proposed, that is according to the direction of δ (+δ or -δ), two sets of switch pulses with dead zone compensation are calculated in advance, thus the dead zone compensation can be realized correctly by the direction of δ in place of current and voltage. Finally, test results on the ±500 kvar SVG show that the dead zone compensation for GTO of the inverters is effective to the operation of the SVG.
出处
《电力系统自动化》
EI
CSCD
北大核心
2001年第9期28-30,63,共4页
Automation of Electric Power Systems
