New fixed frequency AC current controller for a single phase voltage source inverter

The performance of AC current supplies depends on the characteristic of the current controller technique. In this paper, we propose a new AC current control method with constant switching frequency. This controller is a hybrid controller using both sliding mode control and peak current control. The sliding mode controller generates robustness properties according to the load parameter variations and the peak controller method ensures rapid dynamic response and a fixed switching frequency, well adapted to the current tracking issues like harmonic filtering. In addition, its implementation is relatively simple. To explain the irregular current comportment not foreseen by the high frequency average model a mathematical analysis adapted to chaos theory is developed. Both simulations and experimental results are given to validate theoretical modeling.