电力电子技术（power electronic technology）.doc

电力电子技术（power electronic technology） At present, Chinas photovoltaic power generation system is mainly DC system is solar electricity to recharge the battery, and battery power to the load, such as Northwest China to use more solar microwave lighting system and off grid power supply system for DC system station. This system has the advantages of simple structure, low cost, but because of the different load DC voltage (such as 12V, 24V, 48V etc.), it is difficult to achieve the standardization and compatibility, especially the civil power, mostly due to AC load, photovoltaic power supply power supply DC is difficult to enter the market as a commodity. In addition, photovoltaic power generation will eventually achieve grid operation, which must adopt a mature market model, the future of AC photovoltaic power generation system will become the mainstream of photovoltaic power generation. Requirements of photovoltaic power generation system for Inverters The AC power output of photovoltaic power generation system, composed of photovoltaic array, charge discharge controller, battery and inverter part four (general grid power system can save battery), which is a key component of inverter. Photovoltaic power generation system requires higher inverter: 1. requirements have higher efficiency. Due to the high price of solar cells, we must try to improve the efficiency of the inverter in order to maximize the use of solar cells and improve the efficiency of the system. 2. requirements have higher reliability. At present, the photovoltaic power generation system is mainly used in remote areas, many power station unattended and maintenance, which requires the inverter circuit structure with a reasonable, strict screening of components, and the inverter has various protection functions, such as input DC reverse polarity protection, AC output short-circuit protection, overheating, overload protection etc.. 3. input DC voltage in a wide range, because the solar battery terminal volta