Design Of Single-phase Single-stage Isolated Of Line Frequency Grid-connected Photovoltaic Inverter

With the developing of the industry society, energy crisis and environmental pollution have become the two severe tasks that human being must confront. How to maintain the increasing energy supply of industry society? How to protect our surviving environment? Green new energy represented with photovoltaic power generation develops a best-of-both solution for us. As one of the new energy, PV power generation has become the main technique of the new energy techniques by virtue of the PV cell and power electronics techniques'continuous improving as well as the governments'powerful support to new energy.The paper mainly researches the single-phase single-stage power-frequency isolated grid-connected PV power generation system. From the cost, reliability and efficiency perspective, this paper carry depth research to control strategy's design and system hardware's implementation.The paper firstly introduces single-stage power conversion theory and PWM converter's theory, designs a global VSI control strategy based on input power feed forward element and grid voltage feed forward element and simulated by simulink software; introduces the implementation of the system hardware in detail, designs the main circuit based on IPM module and controller founded on TMS320F2808, and gives the corresponding electric schematic diagrams; elaborates the algorithm implementation for each controlling unit,and emphatically expounds the design for islanding protection strategy, puts forward a islanding protection strategy based on inter-harmonics impedance detection, designs the corresponding process flow diagram for each controlling unit's algorithm implementation; on this basis, the paper carries the grid connected experiment base on the prototype.