Design And Simulation Of Inverter Parallel System Based On Strategy Of Droop Control

Today mankind a lot of non-renewable energy exploitation, use, making the wholesociety inevitably face increasingly serious energy crisis and the ecological crisis.Countries in the world have been in studying distributed generation based onrenewable energy in which control of parallel inverter system is a key technology. Inthis paper, it is made the single-phase inverter parallel system as the research object,focusing on a parallel system control strategy, from the system topology, systemparameters, the minimum circulation control, and inverter control has done a detailedanalysis, and it is verified by simulation and experiment.In this paper has made a overall research from the inverter system components,the classification of the parallel system, the main circuit topology, the filter circuit andnetwork control, and the control strategy of the parallel system and other aspects.Various forms of the inverter in parallel were carried out a detailed analysis. Invertersin Parallel Operation without interconnection line are quite suitable for grid-connectedinverter decentralized distributed generation systems. Droop control is a commonlyused control mode in wireless Parallel systems. The traditional droop control strategyhas been improved and used three closed-loop control systems. It has a distinctivefeature in improving the micro-grid stability and limiting the maximum over current.Built a circuit simulation model, the results show that the control method has betteroutput characteristics.The impact of circulation in the system cannot be ignored, and sometimes it willmake the switch over-current protection action and the greater harm is that theprotected switch will trip which will make serious damage. To this problem, this paperhas improved the traditional droop control and the minimum circulation control(MCC) is proposed. By correcting the calculated active and reactive power, it canachieve the purpose of decoupling and adjusting for each frequency of the inverterand the voltage amplitude to realize the state of minimum circulation system. It isverified by simulation and experiment which have proved the Feasibility of thealgorithm.