Research On Parallel Control Of 1MHz Voltage Inverter

Parallel inverter is widely used,it has a wide range of applications in electric vehicles,large computer systems' power supply,communication system's power supply,banking system's power supply and so on.In this paper,the method of repetitive control and PID control is adopted to eliminate the parasitic oscillation of inverter.The repetitive control is helpful to eliminate the periodic disturbance,and the PID control has a good effect on the random interference of the inverter.In this paper,through the synthesis of the two control methods,a very good result on eliminating disturbance is obtained.For the problem of inverter's current imbalance,a value is given at the end of one inverter,and its output serves as input to another inverter,so the current balance of the two inverters is adjusted by this method.Besides,the two inverters are given the same value,so the two inverters are to be stable at the same value.Lastly,we take the average value of the two inverters as the input of the two inverters,so the two inverters are quickly stabilized on the average value.For the control of a single inverter,this paper uses the loop control method,the expert PID algorithm is introduced,and the regulation error is converted to duty cycle pulse,so inverter's loop control is formed.Finally,this paper designs the FPGA voltage conversion circuit,completes the FPGA expert PID programming,the principle block diagram of current balance of the two inverters is designed,and the phase control is added to the block diagram,so finally,the current and phase of the two control loops are formed.