Micro Inverter Power Supply Control Technology Research

In recent years, the conventional energy shortage and environmental pollution are aggravating, new energy development and utilization of gradually become the focus of attention. Micro grid system can not only exert the advantages of distributed power supply, as the economic benefit is brought by the electric power system and users, it can further improve the flexibility and controllability of the power system operation.Researching work of this paper mainly revolves around dual mode inverter power supply, compared the single stage type with the multistage topology analysis, select DC-DC-AC multistage as the topology of the inverter power supply. In order to get low THD grid current, this paper analyzes three kinds of filter performance and comparison, finally the LC filter is suitable for the dual mode inverter power.In independent mode, inverter power supply not only for local load power but also supply to ensure their stable operation, so select current inner loop adjustment and voltage loop adjustment of voltage type control mode. Grid pattern making by the output current of inverter power supply tracking grid voltage, and output current of the burr is less, so select the current hysteresis control mode. Last two modes in the Matlab/Simulink simulation model, through the simulation results, the dual mode inverter power supplys in the independence, interconnection of two kinds of working mode can run and work in independent mode to provide ac voltage to guarantee the normal work load, the grid work mode for power grid transmission or absorption of energy improve energy utilization.Phenomena in the study of the island,which in order to solve the detection methods are not active detection area this problem, an improved method after the island detection and the positive half cycle frequency disturbance, finally, the simulation results that it is concluded the negative effects of the method of power grid is small, and it also have the ability to quickly and efficiently detect the island phenomenon.On two mode switching load voltage in the process of mutation and generate large voltage,it impacts current of power grids, by phase-locked technology realizing the synchronous tracking of power grid voltage frequency, phase, and proposes a kind of adaptation in the process of the dual mode switch seamlessly switch control method, modeling in Matlab/Simulink, the simulation results of the method can effectively realize the inverter power supply in the process of two mode switch seamlessly.