Stability analysis of the shunt regulator in PCU with describing function method

Due to the nonlinearity of the switching process in DC-DC converters, the stability analysis with traditional linear modelling for DC-DC converters are invalid sometimes, especially in the transition interval from stable region to unstable region. In this paper, describing function method is firstly adopted in switching process modelling of DC-DC converters. Further, a new model based on describing function method for switching process is proposed to investigate the stability of the DC-DC converters. A boost converter is taken as an example in this paper, its traditional linear model and the proposed model with describing function method are both established, and the stability analysis based on these two kinds of models are carried out, respectively. Different stability analysis results are obtained according to the two kinds of models for the same boost converter with same circuit parameters and control parameters. According to the simulation and experimental results, it can be concluded that the stability analysis based on the proposed model with describing function method is more accurate and effective in the transition interval from stable region to unstable region, which provide a new stability analysis way for DC-DC converters.

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“…So the stability of the system can be determined by determining the positional relationship between the two curves [17][18].…”

Section: B the Nonlinear Model Based On Describing Function Of The Bmentioning

confidence: 99%

“…SIMULATION AND EXPERIMENTAL VERIFICATION FOR STABILITY ANALYSI S In this paper, MATLAB is used to draw the Nyquist curve [17], and PSIM is used to simulate the boost circuit. The results are validated by experiment.…”

Section: The Describing Function Derivation Of the Swaitching Prmentioning

confidence: 99%