Research And Design Of Combined Photovoltaic Power Generation System Based On UPS Model

With the rapid development of photovoltaic industry in China, the capacity and reliability of the inverter are also higher and higher. Parallel operation of inverters is an important way to expand the power supply capacity and improve the reliability of power supply system. If a photovoltaic system and urban power through static transfer switch to select the power supply, and supply power to load by UPS mode, both to in certain level admiral city electric power system as storage system, but also can avoid the inverse power transmission of city electric effect, at the same time it can improve the reliability of the load supply.Firstly according to the present situation of the background of the multi photovoltaic power system by analysis of UPS mode, photovoltaic power generation system principle, inverter and other technology, constructs the scheme of multi photovoltaic system. Analyze the key issues and then analyze the control technology and capacity technology. Then focuses on the various modules of the system, such as solar controller, inverter module and monitor module, the solar control module mainly carries on the design from the charge, discharge, sampling, MCU electric, auxiliary power and solar radiation slope calculation; inverter module mainly time boost circuit and after class inverter circuit two aspects to carry on the design; monitor module mainly from monitoring system based technologies, RS-485 communication, address allocation, storage unit and display unit design. Finally, the system of the solar control,inverter, monitor module, and then carry out the whole system debug.The advantages of this system are the design and debugging of the sub –modules, parallel control technology of multiple inverters, improve the versatility and flexibility of the inverter, make the system design, installation, and combination more convenient, can further improve the reliability of the system.