Design Of PV Inverter System Based On The Concept Of Microgrid

With the increasing depletion of fossil fuels and the growing problem of environmental pollution, people pay more and more attention on the use of new energy sources. Solar, with its many advantages, come out ahead in the development and utilization of new energy. There are several ways to apply the solar energy. Solar power has become a major application. In this paper,a kind of photovoltaic inverter is introduced, which is designed based on the concept of microgrid.The system, whose kernel component is the photovoltaic inverter,can work on grid-connected mode or run independently according to the external situation. Article focuses on the key technologies of the system, including the design and control of bi-directional DC-DC converter circuit, design and control of PWM rectifier,maximum power point tracking technology, as well as the anti-island. The paper describes the main components of the system. At last, the prototype was produced and tested. Test result has proved feasibility of circuit topology structure and controlling scheme and shown correctness of system parameters.