Design And Study Of The Photovoltaic Three-phase Inverter

At present, the fossil fuels become reduced gradually; the world must find new alternative energy sources. As a renewable clean energy, the solar energy is concerned by every country. Now the important direction of the field on new energy development and utilization is solar photovoltaic power generation. The three-phase photovoltaic inverter provides a usefully tool for the solar energy application.This paper designs main structure of the inverter in the photovoltaic power generation system, and gives the detailed design process of DC/DC circuit and DC/AC bridge inverter circuit. According to the main circuit schematic and the actual system indictors to design main circuit parameters and give the design program of the sampling circuit. The system uses PE-EXPERTII platform as the control core of the system. The platform is based on the high-speed control system of high number of floating-point DSP(TMS320VC33-150MHZ), it can achieve the variety control and multi-channel PWM output.On the basis of the hardware, according to the design requirement of the various parts, debug the photovoltaic power generation system, including the boost circuit with constant voltage control, the joint debugging of boost circuit and DC/AC circuit and the constant voltage constant circuit synchronous debugging of the whole system.At last, on the basis of PV three-phase inverter, research on the disturbance observation disturbance step selected to select to suitable disturbance step and disturbance cycle of disturbance observation method. Use disturbance observation method and the instantaneous scanning method to research the output of maximum power tracking of solar cell power during the condition of whether using the shadow and the different shadow sizes. Compared to the disturbance observation method, the instantaneous scanning method is more suitable for solar cell maximum power point tracking under the condition of partial shade...