The principle of new energy photovoltaic inverter

Are you familiar with the photovoltaic inverter? I believe that many friends are not very clear about it, with the development of China's photovoltaic industry, we will certainly have more opportunities to contact photovoltaic in the future, then, together to understand the principle of photovoltaic inverter it .

I. Working principle and characteristics.

Working principle: the core of the inverter device, is the inverter switch circuit, referred to as the inverter circuit. This circuit completes the function of the inverter through the conduction and shutdown of the power electronic switch.

Features.

(1) Requires high efficiency.

Due to the current high price of solar cells, in order to maximize the use of solar cells and improve the efficiency of the system, it is necessary to find ways to improve the efficiency of the inverter.

(2) Requires high reliability.

At present, PV power station 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 polarity reversal protection, AC output short circuit protection, overheating, overload protection, etc.

(3) The input voltage is required to have a wide adaptation range.

As the terminal voltage of the solar cell changes with the load and sunlight intensity. Especially when the battery is aging, its terminal voltage changes in a wide range, such as 12V battery, its terminal voltage may change between 10V ~ 16V, which requires the inverter to ensure normal operation in a wide range of DC input voltage.

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