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 power converters which has appropriate measures to cope with both nonlinearities and uncertainties-such as the saturation of control voltages, the accompanied time delay, inaccurate system parameters, etc. 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 a vector overmodulation scheme. Both simulation and experimental results have shown the validity of the proposed controller