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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 ,其结果验证了该补偿方法的有效性和必要性
The reason why the output voltage of SVG is seriously deteriorated in the dead zone of GTO is analyzed. An effective method to compensate the dead zone is proposed. This method does not need to judge the direction of system voltage and current in real time to change the law of dead zone in real time. SVG’s own operating characteristics, a method to determine the SVG output reactive direction (which can be achieved by simply determining the direction of the angle between the SVG output voltage and the system voltage), to set the dead band in both directions off-line Compensation angle correction value Δδ, so as to easily achieve the dead-zone compensation method. This method not only effectively reduces the distortion of the output voltage of the SVG, but also saves a lot of CPU runtime. Experiments on a ± 50 kvar SVG demonstrate the effectiveness and necessity of the compensation method