The Research Of Solar Photovoltaic Power Generation In Everyday Household System

Nowadays, Energy depletion and environmental pollution is a growing problem in the world. Therefore, the development of new energy has become the focus of attention of the community.As the origin of all energy on the earth, A kind of renewable energy Solar Energy with its many advantages such as rich, clean, safe, and so on has been extensively explored and get some development. Photovoltaic cells was based on the principle of photovoltaic effect, change the solar energy into the electrical energy directly. Has been paid more and more attention by the majority of society. This article describe how to directly build solar photovoltaic home systems with photovoltaic cells, chopper circuit, battery and inverter.Like the ordinary battery, when the Photovoltaic cells external load and its internal load is equivalent, its output power is maximum. Battery can store energy but photovoltaic cells cannot. This article in accordance with the characteristics of the photovoltaic battery, compared with the several commonly used ways of MPPT (Maximum Power Point Tracking, MPPT), improve the perturbation and observation method which is the most commonly used method. Reference The dynamic reference voltage of maximum power point, avoid miscalculation in the environment of light conditions change rapidly. At the same time, reduces the unnecessary disturbance too at maximum power point.This article uses SPWM technology to Design inverter, combined the advantages of single polarity modulation method with rule sampling method, put forward the single polarity rule sampling method to make the output waveform low harmonics as far as possible. And through the low-pass filter make it has a steady sine wave output. This paper also through the feedback by the output voltage sampling, adjust the amplitude of the triangle carrier wave of SPWM, control the output voltage stability, so that the load change can not affect the output within the scope of rated power.This article verify two methods above mentioned is feasibility through Simulink simulation. This article also through the PIC series single chip microcomputer (MCU) control the whole circuit:Detect whether the photovoltaic cells work at maximum power point, and output PWM waveform control the power switch of chopper circuit; And detect the output sine wave of inverter and control it;And protect the battery and the whole circuit.