In order to reduce the damage of the ferromagnetic resonance overvoltage caused by resonance to the insulation of electrical equipment, this paper proposes a new type of distribution network device and control based on the reactive power compensation device and the reactive power compensation and harmonic elimination function integration. The method, through MATLAB/Simulink simulation software, verifies that the new control method can suppress the resonant overvoltage, and further analyzes and draws the conclusion based on the original reactive power compensation equipment by constructing a simple distribution network analog line and reactive power compensation equipment. By adding a zerosequence control path, a common mode voltage or a common mode current of a certain frequency and amplitude can be injected into the distribution network, thereby realizing the resonance overvoltage suppression function.