Research on Ferromagnetic Resonance Principle and Harmonic Elimination Measures in Distribution Network

摘要

In the ungrounded neutral network, the ferromagnetic resonance caused by the saturation of the electromagnetic voltage transformer is more likely to occur. The ferromagnetic resonance seriously threatens the safe and stable operation of the power grid and can be maintained for a long time. in this paper, the mechanism of the generation of ferromagnetic resonance in the ungrounded neutral network is first studied, the transient mechanism of the formation of ferromagnetic resonance is analyzed, and through the Krylov and Bogoliubov algorithm, the approximate solution of the transient voltage and transient excitation current of the primary side of the voltage transformer is obtained, The damping harmonic elimination is proved to be a more effective method of harmonic elimination. then the ferromagnetic resonance model of the distribution network is built, and the correctness of the theoretical analysis is verified by three typical harmonic elimination measures. The simulation results show that the damping harmonic elimination method is more effective and faster than the method of destroying the resonant parameters.