Researchon The Control Technology Of Parallel Single Phase Inverter System Based On Proportional Resonant Control

In order to ensure stability and good reliability of a power supply system. Powerinverters working in parallel are required. It is easier to expand and maintain.Nowadays, it isone of the vital region in power electronics. Generally, it can be divided into two types:paralleled-inverter with control interconnection and paralleled-inverter without controlinterconnection. As the latter has less parallel interconnection, better anti-interferenceperformance and higher degree of modularity. In this thesis, the wireless parallel invertersystem was presented. Also it is studied in theory and validated by experiment and simulation.On the basis of the mathematic model of the pole-assignment inverters, it is easy to getthe transfer function. Design the output filter and choose the suitable parameters. In fact, twokinds of double-loops control inverter are analyzed. The results show that proportional andresonant controller is better in controlling AC signal compared with PID controller.In the following part of this paper, the mathematical model of the two inverter parallelsystem is established,then calculate the active and negative power on the condition ofθ=0、θ=90andθ=0θ=90, finally give a droop method.Finally, a small signal model which based on the time-varying phasor of this System isbuilt. Refer to the transient process of the droop regulating. Therefore, the parameters of theparallel system can be designed more accurate.Based on MATLAB/simulink simulation model, the validity of the control method andparameters choose are proved. The result shows that this system has faster response, stabilityoutput and strong ability of current distribution.