For the development of distributed power supply active distribution network\nsystem, the instability of the power supply side causes the system frequency to\nbe disturbed, and harmonics, voltage fluctuations, or ferromagnetic saturation\ncauses resonance and other series of power quality problems; what resulting\nin the over-voltage and over-current can easily damage components\nand threaten the system's safe and stable operation. In order to solve these\nproblems, this paper compares some harmonic detection and filtering methods,\ndevices and methods for suppressing resonance in recent years, and\ncombines the principle of resonance to design a nonlinear inductive circuit\nthat can suppress resonant overcurrent according to the characteristics of\nnonlinear inductors. Compared with the Resistance (R) series Induct Capacitance\n(LC) parallel circuit composed of common inductors, the circuit described\nin this paper is not affected by overcurrent, and the influence of\novervoltage is relatively greatly reduced. The simulate-on proves that this\ncircuit suppresses the effects of resonant overvoltage and overcurrent.
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