Optimal stability control method for transformer-linked three-phase boost chopper circuit

The boost converter system for the Electric Vehicle (EV) and the Hybrid Electric Vehicle (HEV) requires a compact and light weight performance. The transformer-linked three phase boost chopper circuit is a means to obtain this requirement. In our circuit, the size of the smoothing capacitor and each phase inductor are reduced by a third as compared with a single-phase boost chopper circuit. The purpose of this paper is to examine a stable control design for our proposed circuit. If a stable control design is performed using a frequency property, compared with the conventional control design method, the proposed boost chopper circuit can obtain a more stable operational performance. The frequency property of the proposal circuit was analyzed using a state-space averaging method. Similarly, the control system was designed using this frequency property. The results of the stable performance of the proposed boost chopper circuit is discussed along with our experimental results.