Research Of Digital Inverter Based On Double Loop PID Control

With the rapid development of microelectronic technology and power electronic technology,the application field of inverter technology has reached an unprecedented broad.This allows users to have more strict requirements for power,so people began to pay more attention to the research of high quality and low cost inverter.Compared with other methods,the switching device has high efficiency when switching the electric energy.Due to the rapid development of semiconductor technology,the cost of digital signal processing chips are declining,so the application of digital control is also expanding.Firstly,this paper introduces the development of the inverter power,and explains the advantages,development trend of the digital inverter.The advantages and disadvantages of various inverter power sources such as PID control and repetitive control are analyzed and the development trend of compound control is put forward.Secondly,according to the circuit structure and working principle of the inverter,the mathematical model of the digital inverter is obtained,and the simulation is carried out.The influence of the digital process on the performance of the whole system is introduced,and the factors that affect the whole system are analyzed.The double loop PID control of current-voltage has fast response and fast dynamic response to the error.Repetitive control can accumulate the error signal periodically until the error is completely eliminated,but the rapidity of the system cannot meet the requirements.Therefore,this paper establishes a compound control strategy based on current-voltage double loop PID control and repetitive control.Through the simulation experiment proved that double loop PID control and repetitive control of the parallel system can take the advantages of the two control strategies.Finally,build the experimental platform of TMS320F2812 digital inverter,the results show that the designed controller can meet the requirement of the experiment.After analyzing and verificating of each part,the waveform shows the system is feasible.