The Research On Paralleling Control Technique Of Inverters Based On Power Shairng

Parallel inverter technology is widely applied to power systems, powertransmission, power electronics and other fields, in order to improve the capacity ofinverters. Relative to the large capacity inverter with independent operation, theparallel inverters system with parallel forms has high reliability, safety, flexibility andredundancy.The purpose of this topic is to realize the parallel systems of multiple invertersbased on the power sharing control. In parallel inverters, the direct cause of systemcirculation is difference of each inverter’s output voltage. Aiming at the problem, thisthesis studied the method adjusting output voltage of each inverter unit. This methodcan realize that the output voltage of each unit equal in amplitude, frequency, andphase so that the goals of parallel circulating current restrain and parallel inverterscan be achieved. Then, the thesis designs the structure of parallel inverter system.Aiming at the problem on detecting power fast and accurate, the powercalculation methods are discussed, and the power detection method was investigatedin which the output current is replaced by inductance current. On the Matlab/Simulinkplatform, the correctness and feasibility of the control strategy is validated. Thecorrectness and feasibility of the control strategy is validated. Finally, the parallelinverter system experimental platform is built, and experiment verification is carriedout.The simulation and experimental results indicate that, the power sharing controlstrategy of inverter parallel system in can inhibit circulation current of parallel systemwell. Then based on Matlab/Simulink simulation tool, the correctness and feasibilityof the inverters parallel system control strategy is validated by simulation.