The efficiency of 1 photovoltaic inverter has higher requirements. Because the 2011 solar cell prices high, in order to maximize the use of solar cells, improve the efficiency of the system, must try to improve the efficiency of the inverter.
Reliability requirements of 2 photovoltaic inverter with high. In 2012 the photovoltaic power generation system is mainly used in remote areas, many power plant unattended operation and maintenance, this requires the inverter circuit structure with a reasonable, strict selection of components, and requested the inverter has various protection functions, such as the input DC reverse polarity protection, AC output short circuit protection, overheating, overload protection.
3 photovoltaic inverter DC input voltage requirements are applicable to a wide range, because the solar battery terminal voltage with load and sunshine intensity, although the voltage of the solar cell battery plays an important role, but due to the voltage of the battery and the fluctuation change with the residual capacity and internal resistance of battery, especially when the battery aging its change range the terminal voltage of the battery is very large, such as 12V, the terminal voltage can be changed in the 10V ~ 16V, which requires the inverter must ensure the normal work of the DC a wide range of input voltage, and ensure the stability of the AC output voltage.
4 photovoltaic inverter in photovoltaic power generation system, large capacity, output inverter for smaller distortion sine wave. This is because, in large capacity system, if the use of square wave power supply, the harmonic component of the output will be contained more, higher harmonics will generate additional loss, many photovoltaic power system load for the communication equipment or instrument, these devices have higher requirements on power quality of grid connected photovoltaic power generation system, when in operation, large capacity when, in order to avoid the power pollution and public power grid, also asked the sine wave inverter output current.
