The Parallel Inverter Technology Research Based On Repeated PI Control

In this ever-changing contemporary technological era, energy development andapplication has caught more and more community’s concern and attention. How to improvethe capacity and reliability of power supply has become the major focus of power sourceresearch, and distributed generation is also favored. Undoubtedly, inverter parallel technologycan improve power capacity while taking advantage of the parallel redundancy to ensure thereliability of electricity. the parallel method of no interconnection lines can meet therequirement of distributed generation. so this paper selects wireless parallel method as thefocus of this study, this will be the future of parallel power technology development trend.For the problems existed in non-interconnect line inverter parallel system, this paperhas improved the control strategy of parallel inverter in non-interconnect line system.repetitive control method and traditional PI double dual-loop combining method has beenbrought in. the second chapter introduces the composite control model, describing in detailthe design parameters of the repetitive controller and PI controller. This control method notonly improves the accuracy of system’s steady state control and dynamic response speed, butalso improves the nonlinear loading ability and parallel circulation characteristics byrepetitive control. The paper also describes the basic principles of PQ droop characteristicsand principles of circulation generation; it gives the methods of determining the droop factorand analyzes the advantage of the control method in this non-connective line parallel system.This paper has built a simulation model of parallel system in MATLAB/SIMULINK,including power calculation module which is the most complex and critical part, and it ispackaged into a subsystem for later calls. The simulation proves the superiority of duplicatePI composite control methods in non-connective line parallel system. some parameter’sprobable range or specific values are selected through the debug, the validity and superiorityof the design is finally proved.Finally, this paper gives the design proposal for the core hardware system based onDSP2812, including control module, protection module, isolation module and power supplymodule.