Independent MPPT PV Inverter System Design Based On

Energy is the mother of all industry. With the declining of fossil energy, thedevelopment of renewable energy sources is imperative. The solar power withadvantages such as zero pollution and large reserves becomes one of the hotspots ofnew energy studies. MPPT (Maximum power point tracking referred MPPT)technology is one of the key technologies of photovoltaic power generation, toimprove the efficiency of solar energy conversion, to maximize the use of solarenergy to improve the utilization of the investment recovery and cost. When thesolar cells maximize charging the battery, you need to convert DC to220V50HZ ACwhich household appliances require for. So the power inverter also becomes animportant part of the photovoltaic technology research.In this paper, a stand-alone photovoltaic power generation system is theresearch object. First, we make a simulation model of the PV array based on analysisof the photovoltaic cell characteristics by using MATLAB/SIMULINK, and thenintroduce the principle and classification of SPWM control technology in powerinverter, which provides a theoretical foundation of the MPPT algorithm simulationand inverter control.Compared the two MPPT control algorithms (duty cycle perturbation methodand fuzzy control method), which focuses on the MPPT control algorithm based onfuzzy control. The simulation results show that the fuzzy control method has betterdynamic and steady-state performance in rapidly changing environment. Accordingto the deficiencies of the fuzzy control method, a fuzzy neural network method is putforward, which generates new fuzzy inference system by the neural network training,so that the photovoltaic maximum power point tracking is more scientific.Boost circuit is as the main loop of the MPPT system. Its applicability is verifiedin MATLAB simulation. PIC16F716generates different PWM wave by using MPPTcontrol algorithm, so that it controls the Boost circuit of power switch conductionand off. The thesis designs sine wave inverters for photovoltaic systems, using theinverter design-"push-pull circuit+high frequency boost+full-bridge", which the hardware part is divided into the DC boost links and inverter link. The software part isthat PIC16F716generated the SPWM wave by using the equivalent areaprogramming to drive the FET, so that the power inverter output the quasi-sine wave.Finally the inverter is tested with a load, sine wave is generated by an oscilloscopeobservation, which has little degree of distortion and in line with the actualrequirements.