PWM Inverter Resonant Double Loop Digital Control Technology Based On Research

With high quality power equipment for the power and the growing demand for power quality, high-performance PWM Inverter more and more people are concerned about. Digital control of a variety of methods have emerged, a strong impetus to the development of inverter control technology.This paper mainly studies PWM inverter, due to the traditional PI controller can not achieve DC AC signal output without static error, according to internal model principle, resonant controller includes the mathematical model of the AC signal can be a very good track sinusoidal instructions. The inner current loop proportional controller can speed up the current track and speed, therefore this paper, the proportion of resonance control technology. Resonant controller and analyze the impact on the system parameters to be determined. In order to overcome the use of high frequency, small computer finite word length, resulting in a larger quantization error and limit cycle oscillation and other issues, the introduction of the Delta operator, resonant controller in favor of the realization of actual control.Based on theoretical analysis and simulation results, carried out on a prototype digital controller with the resonant double loop control experiment, simulation results show that the control system has good steady state performance, strong harmonic suppression can be better meet the performance requirements of the power inverter.