Study of Modulated Hysteresis Regulator for a Single Phase Voltage Source Inverter

The performances of AC current supplies depend on the characteristics of its current controller [1]. In this paper, we study a large bandwidth ACcurrent controller combining the robustness properties of a hysteresis controller with constant switching frequency of PWM technique. A high frequency average model is proposed for this modulated hysteresis regulator to study its dynamic properties. A second approach of modelling, based on the construction of a 3-dimensional bifurcation diagram allows studying the nature of the cycle described by the state trajectory and proving that the system operates with a fixed switching frequency. Design rules of control parameters of this controller (for AC and DC applications) are explained and its robustness properties are tested by numerical simulations.

Keywords:

Hysteresis controller , robustness , modelling , bifurcation diagram , form function