The requirements needing for solar energy inverter

The requirements needing for solar energy inverter




Through the solar photovoltaic technology to convert solar radiation into electrical energy is now on the market the most effective is also the most potential for development of renewable energy technologies. Now, ordinary solar PV systems are composed of many closely linked to the composition of solar panels. The panels first division series, and then the series of different batteries in parallel together to form photovoltaic arrays.



At present, China photovoltaic power generation system is mainly DC system will soon be issued by the solar power to recharge the battery while the battery power directly to the load, such as the northwest region of China use more solar household lighting systems, as well as away from the grid for the microwave station power system are DC system. Such a system is simple, low cost, but because of the different load DC voltage (eg 12V, 24V, 48V, etc.), it is difficult to achieve the system standardization and interoperability, in particular electricity for civilian use, as most of the exchange of the load, to DC power photovoltaic power supply is difficult to enter the market as a commodity. PV grid will eventually run, and this must be a mature market model, the exchange of photovoltaic power generation system in the future will become the mainstream of photovoltaic power generation.



Solar Power Inverter is a power electronic circuits, solar panels can convert the DC voltage AC voltage to drive home appliances, lighting and electrical tools, communication load, the whole solar system, a critical component. Inverter has two basic functions: one is to complete the DC / AC current converter connected to the grid, on the other hand is to identify the best operating point in order to optimize the efficiency of solar photovoltaic systems. For a given solar radiation, temperature and battery type, solar photovoltaic systems have a unique corresponding optimal voltage and current, so that the largest photovoltaic system to produce energy. Therefore, in applications in solar power inverter must meet the following basic requirements:

1. Requires a high efficiency. As the current high prices of solar cells, in order to maximize the use of solar cells, to improve system efficiency, we must try to improve inverter efficiency.

2. Requires a higher reliability. Photovoltaic power generation system is currently used in remote areas, many power plants unattended and maintenance, which requires inverter circuit with a reasonable structure, rigorous selection of components and requested inverter with various protection features such as input DC reverse polarity protection, output short circuit protection exchange, thermal, overload protection and so on.

3. Require DC input voltage to adapt to a wide range of terminal voltage due to solar cells with the load and sunlight intensity changes, although the solar cell battery voltage plays an important role, but because of the battery voltage with the remaining battery capacity and internal resistance changes in volatility, especially when the aging battery terminal voltage when the change of its large range, such as the 12V battery, its terminal voltage can be varied between 10V ~ 16V, which requires to be in a larger inverter DC input voltage assurance that the work, and to ensure that the exchange of the output voltage stability.

4. In the medium and large-capacity photovoltaic power generation system, the inverter power output should be less distortion sine wave. This is because in the middle and large-capacity systems, the use of a square wave power supply, the output will contain more harmonics, high harmonics will result in additional losses, many of photovoltaic power generation system load for the communications or instrumentation These devices have high requirements for power quality, among others, large-capacity photovoltaic power generation system and network run-time, in order to avoid contamination with the public electricity grid, also called sine-wave inverter output current.



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