晶闸管投切电容器的盲区及减小盲区的控制策略

Dead Zone of Thyristor Switching Capacitor and Control Strategies for Reducing Dead Zone

晶闸管投切电容器(thyristor switched capacitor,TSC)的补偿效果取决于电容器的容量与电容器组的编码方式,为了减小TSC的控制盲区,防止投切振荡,提高TSC系统的稳定性与可靠性,比较了不同的电容器编码方式的优缺点,研究使用等差编码方式减小控制盲区的最优电容器组的编码方式。结果表明等差制编码式的控制盲区小于等比制编码式(二进制编码)的控制盲区。因此,采用合理的等差编码方式能有效提高TSC系统的性能,有利于降低投切振荡的可能性,提高无功补偿的精度与可靠性。

Compensation effect of thyristor switching capacitor （TSC） depends on capacity of the capacitor and coding mode of capacitor bank, in order to reduce controlling dead zone of TSC and improve stability and reliability of TSC system, this paper compares merits and demerits of different coding modes of capacitor banks and studies optimal coding mode for reduc- ing controlling dead zone by using equidifferent coding mode. Results indicate that the controlling dead zone of equidifferent coding mode is smaller than that of equal ratio coding mode. Therefore, it is proved that reasonable equidifferent coding mode could effectively improve performance of TSC system, favorably reduce probability of throw-switch oscillation and im- prove precision and reliability of reactive power compensation.