Research On House-hold Photovoltaic Power Generation System Based On Bi-directional DC/DC Converter

With the developing of the global economic, energy problem is becoming increasingly acute. More and more countries are beginning to pay attention on energy utilization and conversion efficiency. Solar energy is clean, quiet and inexhaustible. So, photovoltaic industry developed quickly all over the world. Especially, the independent photovoltaic power generation system which supplies the power for the remote users has become the point of photolatic research field in our country.There're a lot of advantages for China to develop the independent photolatic power generation system. Now in china, the areas without electricity are located in the western regions and the southeastern islands. With the rich solar radiation and the long annual average sunshine time, the photovoltaic generation systems in these areas are efficient. Of course, the cost of photolatic power generation decreased significantly. So, the decentralized power generation technology has been widely used in the remote areas where need power urgently. In these areas, the independent photovoltaic generation technology is becoming dominant than the conventional power grid technology gradually.The independent photolatic power generation transforms solar energy into electric through the solar panels. One part was transformed to the AC load, such as television, refrigerator and so on. Another part gets through the bi-directional DC/DC converter for battery charging. And battery supplied energy to the load when the solar generation system stopped supplying the energy.In this paper, we analized the characteristics of solar cells. After introducing several different ways of realizing maximum power point tracking, we did research on the bi-directional DC/DC converter and battery charge and discharge management. In the end, we designed a set of household independent photovoltaic power generation system with TMS320F2812 as the control core. In the intelligent control system, we realized the MPPT by the way of incremental conductance algorithm, and implanted high efficiency battery chare and discharge control strategy to realize the power intelligent management. In the end, the waveform analysis of experiments and simulation were shown. Results proved that the system can achieve performance index required.