Single-phase Photovoltaic Power Generation Inverter System And The Realization

Now, development of Photovoltaic power technology and industry is flourishing. Inverter system is the very important link in Photovoltaic power system. Its reliability directly affects the normal operation of Photovoltaic power system. This paper has done the simulation and experimental research about inverter system of Single-Phase Photovoltaic power system and the design of experimental Prototype.The Single-phase full-bridge and the isolation of output transformer topology is selected in main circuit of inverter system. The principle of main circuit and IGBT snubber circuit were detailly given. The simulation of the main circuit and IGBT snubber circuit were done. Finally, the design and debugging of main circuit and the production of PCB were completed and the experimental results were given.The simulation research and experimental analysis about voltage source-voltage control of independent Photovoltaic power system and voltage source-current control of grid Photovoltaic power system were given in control circuit of inverter system. A method of double-loop control was proposed. Double-loop controller can control the instantaneous and average of the output of main circuit at the same time. It has fast response speed and high control precision. The transfer Function of double-loop control system was derivated with main circuit model and the control parameters were optimizated according to the dynamic and steady performance of the system . The circuit model of double-loop control system was established using Matlab. The simulation results of the sudden increasing load and sudden dumping load at voltage source-voltage control. Theoretical analysis of PLL at voltage source-current control and simulation results of PLL with double-loop control system were given. In addition, control circuit has the function of the detection and treatment of fault, trigger control of fault, detection of power, detection of main circuit DC Bus and real-time display of system state. Finally, the design and debugging of control circuit were completed and the the experimental results were given.A novel design thinking was proposed in the design of driving circuit. It has the function of detection and treatment of fault about IGBT working conditions with the completment of isolation and enlargement of control signals. TLP250 and UC3845 is respectively the control chip of the isolation-enlargement and the treatment of fault. Finally, the design and debugging of driving circuit were completed and the experimental results were given. The topology of PFC+ Single-ended flyback was used in control power. The harmonic pollution of control power was greatly reduced with the control of Fairchild PFC chip FAN7530 and the green power was realized. The method of zero-pole compensation was applicated in the design of feedback circuit of Single-ended flybackpart. The gain of middle-frequency band and dynamic-steady performance of controlpower were improved. Finally, the design and debugging of control power were completed.Finally, the design and debugging of inverter system were completed based on four parts of simulation research and experiment analysis. The results prove that the inveter system operate stably and the performance meet the design requirements.