Design Of Solar Energy Inverter Used In Household

Energy is the living and developing basement of human,important physical security for the sustainable development of social econmy.With the energy running out,more and more people favor renewable energy sources represent by solar energy because it can protect environment and will never run out.Considering that it's difficult for herdsman in the northwest area and watch-out in jumping-off area to use electricity,and there are abundant solar energy resorce in those area,so we design 500 W households inverter system using solar energy.Considering the high price of the solar energy batteries,according to the U-I performance characteristics of solar energy batteries,charge and discharge control strategy was proposed based on solar energy household-use inverting power supply maximum power track technology(MPPT).In order to boost the reliability of the whole system,the paper add anti-interfere measures like digital filtering algorithm and watch-dog into the software realization of charge and discharge control.In the after polar raising-pressure and inverting part,applying the technoloy of pull_push high frequency inverting,and utilizing TL494 to construct electricity pressure stable circirt controlled by PI.At DC/AC part,the paper first analyse theoretically the SPWM method,and analyse SPWM control mathod based on software.At last,the paper proposed the way of realizing hardware SPWM control based on dsPIC30F2020 MCU to construct high frequency triangle basic wave 50Hz sine modulation wave.The paper theoretically deep-analysed the shape-chosen of the instrument according to pratical project needs,and finished the protection under any special circumstance(counerfix of charging batteries,input over pressure,under pressure,over input,output short circuit,overheat etc.At last,according to those theoretical research,an independent 500W solar energy household-use inverting power supply was made,all kind of testing have been practiced on its capability,the results turned out that the whole capability and indexes have reached the design requests.