Analysis of a filter circuit for nonlinear loads

A capacitor is connected in parallel with a saturated core coil assembly (a nonlinear load) to reduce the magnetizing current. A linear reactor is connected in series with supply to reduce the distortion in supply current. This typical reactor capacitor filter system has been analyzed by an iterative procedure based on harmonic equivalent circuits. The analysis presented here predicts the harmonic resonance points of the circuit with good accuracy. The technique is applicable, in general, to any nonlinear load.