Based On The UPS Of Photovoltaic Power Generation System Research

Photovoltaic power generation systems convert solar energy into electrical energy, and then the power supply load into use, storage or grid. According to its relationship with the power grid, the existing photovoltaic power generation system can be divided into independent off-grid system and grid system. In off-grid photovoltaic power generation system, pv array for battery charging and supply power to the load when the power from the pv array is not enough to supply the user to use, battery as energy supplement. But the battery power supply ability is limited, not enough to meet the needs of the users of power for a long time. In a grid type photovoltaic power generation system, avoids this kind of circumstance happening, but increased the number of inverter, increase the cost.This paper combine the two systems of existing, with grid connection and photovoltaic power generation systems, UPS. UPS contains a bidirectional converter and battery. Ac power grid, the ordinary enabled UPS battery as backup power supply, battery power supply ability is limited, however, not for a long time to load power supply. In photovoltaic power generation system with UPS, power from the pv array through UPS inverter by the bidirectional converter into an alternating current supply load, side of battery. Such not only solved the important load of the normal power supply, ensure the power supply reliability; Also solve the problem of battery energy storage co., LTD., to extend the time of the emergency of UPS power supply; In addition, from the structure, less than the traditional grid photovoltaic power generation systems a inverter, also saves the cost.This paper studies the main contents include:first, introduce the structure and principle of the photovoltaic power generation system with UPS. The analysis of the bidirectional converter topology structure, working principle, on the basis of the double loop control strategy based on feedforward decoupling control, the different model of the rectifier inverter switch in order to achieve the purpose of energy bi-directional flow. Research mainly focuses on the two-way control of inverter and the hardware circuit design, mainly includes the control method of the research, the implementation of space vector, hardware circuit design and simulation.