Research On Deadbeat Digital Control Technique For PWM Inverters

With the extensive application of computer, information technology, processing technology, Internet's rapid development in various fields of high-end inverter increasing technical requirements, not only to high-quality output voltage waveform, so all Control the application of technology in all areas of concern by the people.This paper mainly studies PWM inverter, given the variety of digital control technology, the deadbeat control with fast transient corresponding control and high accuracy can track command value,control method is used in the current inner deadbeat digital voltage outer loop control technology ,the entire system to the inverter as a controlled objectwe calculate these control parameters based on pole-assignment method. Among them, the outer capacitor voltage, inductance current, are proportional part of the inner control To avoid modulation limitation caused by the sampling and calculating time of digital processor, design of state observer is brought in.Based on theoretical analysis and simulation results, carried out on a prototype digital observer double loop deadbeat control experiments, Simulation results show that the control system has both good steady state performance,then have fast response, can meet the performance requirements of the power inverter. Experimental results show that the control system output waveform with no load steady-state error is small, the waveform distortion is small, however, resistive load increases, the voltage in a short period of time can not be maintained near the specified value.