The conventional active ferroresonance elimination device has a relatively large jump in the harmonic elimination process, and the hysteresis effect is obvious, which greatly reduces the effect of real-time tracking. In view of this, we propose an active voltage transformer(VT) ferromagnetic elimination method based on PID control. Based on the analysis of the ferroresonance elimination resistance matching algorithm, the matching principle of the ferroresonance elimination resistance in different situations is deduced, and the ferroresonance elimination control system based on the PID control strategy is constructed. Through the slow energy consumption process, the rapid energy consumption process 1 and 2, the resistance value is dynamically adjusted to adjust the current of the tertiary winding, so that the tertiary winding is not overloaded, and can prevent the ferromagnetic resonance of the VT in an active way at the fastest speed, and can be flexibly and dynamically adjusted, without jumps, and will not cause new resonances.