Analysis of a circuit exhibiting ferroresonance

This study investigates a low-pass circuit featuring saturation. The describing function method is used to linearize the model. One commonly encountered low-pass device is the RLC filter, which is frequently used in power electronic applications to smooth the wave forms of the circuit variables. However, in case the values of the variables pertaining to the inductance exceed those of the rated, the corner frequency of the filter may change drastically. This is due to the nonlinear phenomenon ferroresonance. A systematic procedure for the analysis is presented that with reasonable accuracy accommodates most inductors represented by nonlinear magnetization curves. The results of the study show the importance of considering saturation in the design process of the aforementioned filter and how the bandwidth of the same is influenced by the circuit parameters