Stability Analysis of Switching System in Space Power Supply

In order to maintain the stability of the bus voltage, the space power supply switches between the discharge circuit module, the charging circuit module and the shunt circuit module according to the change of the solar cell and the load, and the switching transition process can be approximately equivalent to the dead zone model. In this paper, the system is modeled by the small-signal modeling method, and according to the average dwell time method, we can find the average dwell time index which can make the system stable. Then we calculate the real-time dwell time index of the system by Markov analysis method, and compare with the average dwell time index to judge the stability of the system. Finally, the effectiveness of the proposed method is proved by simulation.