What is the working environment of photovoltaic inverters?

Photovoltaic inverter is a power adjustment device composed of semiconductor devices, which is mainly used to convert DC power into AC power. It is generally composed of a boost circuit and an inverter bridge circuit.

1. Photovoltaic inverters require high efficiency. In order to maximize the utilization of solar cells and improve the efficiency of the system, it is necessary to try to improve the efficiency of the inverter.

2. Photovoltaic inverters require high reliability. Photovoltaic power generation systems are mainly used in remote areas, and many power stations are unattended and maintained, which requires the inverter to have a reasonable circuit structure, strict component selection, and requires the inverter to have various protection functions, such as input DC poles. Reverse polarity protection, AC output short circuit protection, overheating, overload protection, etc.

3. The photovoltaic inverter requires a wide range of DC input voltage. Since the terminal voltage of the solar cell varies with the load and the intensity of sunlight, although the battery plays an important role in the voltage of the solar cell, the voltage of the battery varies with the remaining voltage of the battery. The change of capacity and internal resistance fluctuates, especially when the battery is aging, its terminal voltage has a large range of change, such as a 12V battery, its terminal voltage can vary between 10V and 16V, which requires the inverter to be larger. The normal operation is guaranteed within the range of the DC input voltage, and the stability of the AC output voltage is guaranteed.

4. Photovoltaic inverter In medium and large-capacity photovoltaic power generation systems, the output of the inverter power supply should be a sine wave with less distortion. This is because in medium and large-capacity systems, if a square wave is used for power supply, the output will contain more harmonic components, and higher harmonics will generate additional losses. Many photovoltaic power generation systems are loaded with communication or instrumentation equipment. The equipment has high requirements on the quality of the power grid. When the medium and large-capacity photovoltaic power generation systems are connected to the grid, in order to avoid power pollution with the public power grid, the inverter is also required to output sine wave current.