Research Of Photovoltaic Inverter Based On DSP28335

With the rapid development of social economy,increasment of energy consumption,and the burning of fossil fuels have brought serious environmental pollution.Therefore,it is a great significance for the sustainable development of human beings to study the utilization of new energy sources.Solar energy as a renewable clean energy,with its inexhaustible,wide range of use,no pollution and other advantages has become a research hotspot of modern new energy,thus,off grid three-phase photovoltaic inverter is studied and designed in this paper.In this paper,the independent photovoltaic power generation system is composed of photovoltaic cell array,boost converter,storage battery,three-phase full bridge inverter and other components.In order to make full use of PV array power,the output characteristics of photovoltaic cells,and three kinds of control methods of the disturbance observation method,incremental conductance method and voltage feedback method of the maximum power point tracking(MPPT)were analyzed.Finally,the maximum power output of PV array is obtained by the disturbance observation method.In view of the independent photovoltaic power generation system,the battery charging and discharging control method is determined when the photovoltaic power generation needs the storage battery to supply power to the load.The three-phase full bridge inverter adopts the double closed loop control strategy based on the feedforward decoupling current inner loop and the external voltage loop,and uses the SVPWM algorithm to generate the PWM wave of the inverter power switch.The simulation model is built in the Simulink environment and the results show that the perturbation observation method can well follow the maximum power point of the PV array and inverter output stable waveform.Finally,using the main control chip of TI's TMS320F28335 designed control circuit,which including the design of driving circuit design,sampling and CCS5.5 compiler environment based on maximum power tracking procedures,inverter control procedures,battery charge and discharge procedures.In this paper,the experimental platform is based on the circuit design of hardware and software,the experimental design of the photovoltaic inverter power supply is analyzed,and the rationality of the design is further verified.