| In recent years, the world's increasing emphasis on ecological sustainability of development, started to take a series of measures to reduce pollution and carbon emissions of sulfur, in which new energy development and utilization is of most concern. It mainly reflected depth development of solar, wind and ocean energy and other sustainable natural energy.the trend begins that the sustainable generating system gradually replaced polluting coal-fired power. The electric power system needs to go through the power conversion devices to supply users. The inverter is a power conversion device in the main part of the AC power, which is widely used in industrial and civil fields.With the power generation and electrical equipment, increasing the capacity of the power conversion devices, reliability and security requirements have become more sophisticated, and power electronics deepening the theory of supply requirements to meet the user to provide a guarantee.Parallel operation of three-phase inverter can achieve high capacity and redundant power supply, and with high reliability, power system design has become the preferred solution, and will become an important trend in the future development of inverter technology.It is presented in this paper that, with three-phase inverter as the research object,the topology of three-phase inverter was firstly analyzed. And mathematical models were built in abc and dqO coordinate system. The model of inverter was decoupled in two-phase rotating coordinate system. The double-loop control strategy of the inverter was highlightedly researched based on space voltage vector modulation, then the parameters of the system were designed. The simulation model of the inverter control system was established in Simulink. And simulation results showed system has good static and dynamic characteristics under rated resistive load, no-load and dynamic load conditions. Secondly, the topology of three-phase inverter parallel system was analyzed.The main cause of the circulation and the impact on the size of circulation by filter parameters were researched. The instantaneous current sharing control strategies and preemptive control phase synchronization were focused. The simulation model of three-phase inverter parallel system control system was established in Simulink. With two parameters significantly different condition between two inverters, the parallel circulation was compared before and after flow control part. Simulation results show that after adding all current links, system can be controlled at a relatively low level circulation, thus ensuring reliable and stable operation of parallel systems. Finally, in this paper, TMS320F28335 TI's DSP as the controller model was designed hardware and software of parallel three-phase inverter control system, and conducted the actual testing, experimental results proved that the correctness and effectiveness of the control strategy and experimental design described in this paper. |
PDF Full Text Request