一种抑制电压互感器铁磁谐振的新方法

摘要

Focus on the ferromagnetic resonance of PT which is the most common resonance in power system, a new method to suppress it is proposed： a thyristor is placed in the open-delta of secondary side of PT. When the ferromagnetic resonance of PT happens, the factors giving rise to ferromagnetic resonance of PT are destroyed by triggering the thyristor immediately, so that ferromagnetic resonance of PT can be suppressed effectively. Because of the controllable firing angle of thyristor, ferromagnetic resonance of PT is able to be restrained effectively without any damping resistor placed in the open-delta of secondary side of PT. This method is proved to be correct and effective by theoretical analysis and simulation.%针对PT铁磁谐振这种电力系统常见的谐振形式，提出一种新的抑制方法：在门二次开口角串人一晶闸管，当系统发生PT铁磁谐振时，控制晶闸管瞬时导通，从而打破造成PT铁磁谐振的条件，进而对产生的胛铁磁谐振进行有效抑制。由于电力电子开关器件晶闸管的导通时间可控，使得在PT二次开口角内不串人任何阻尼电阻的情况下既可对PT铁磁谐振进行有效抑制，理论分析和仿真实验都印证了该方法的有效性。