The Research Of Low-power Photovoltaic Grid-connected Inverter

With coal, oil, natural gas and other traditional energy reserves and much pollution tothe environment, in order to alleviate the energy crisis and achieve sustainable developmentbetween environment and energy, nowadays countries around the world begin to developclean and renewable energy. PV as a new renewable energy sources, without pollution,abundant resources and many other advantages. The development of PV grid-connectedinverter solve battery energy storage solution in an independent photovoltaic powergeneration with the resulting energy loss, while reducing system complexity.On the basis of a reference project model of the PV array in this paper, the photovoltaicsimulation module is built in the Simulation environment. By comparing and analyzing theprinciples, occasions and the scope of maximum power point tracking (MPPT) algorithm,for many shortcomings of traditional algorithms we propose a fuzzy logic controller is appliedto the duty cycle perturbation and observation method, the formation of MPPT fuzzy controlfor the duty cycle perturbation new algorithm. The simulation model based on theconventional perturbation and observation method, the results show that the new algorithmcan quickly and accurately achieve the maximum power point tracking for photovoltaic cells,reducing system cost and losses. By designing the system hardware circuit works, includingpre-level Boost circuit and post-level inverter circuit and each computing device parametersand selection and design of the drive circuit, sample conditioning circuits, and other relatedcircuit protection circuit, and finally the paper introduces the method of generating SPWM(Sinusoidal Pulse Width Modulation) with DSP and the MPPT algorithm implemented insoftware, procedures and interference. Analyzing the waveform simulation of inverter outputto verify the feasibility of this research topic.Finally, the test results are given in hardware circuit, can be seen from the measured waveform basic circuit design can achieve a pre-task and verify the feasibility and rationalityof the design.