Analysis and design of digital current controller for PWM converters

From the viewpoint of robust current control, it is important to design a digital current controller for PWM converters which has the appropriate measures to cope with both nonlinearities and uncertainties such as the saturation of control voltages, the accompanied time delay, the inaccurate system parameters and so on. As a solution, this paper suggests an intelligent current controller which consists of a proportional controller with very high gain, a conditional integrator, a delay compensation scheme, and the space vector PWM method using vector over-modulation scheme. The simulation and experimental results have shown the validity of the proposed controller.