The working principle of a micro-inverter for photovoltaic systems
A micro-inverter performs individual Maximum Power Point Tracking (MPPT) for each photovoltaic module, then inverts the DC power and feeds it into the AC grid. Compared to centralized, string, and distributed inverters, micro-inverters are the smallest in size and power, typically with a power rating of less than 1 kW.
The advantages of micro-inverters include the ability to independently track the maximum power point for each module, improving overall system efficiency in the case of shading or performance differences between modules, while also ensuring the maximum safety of the solar power station.
The working principle of a micro-inverter is as follows:
- DC Input: The DC power generated by the photovoltaic panels is transmitted to the micro-inverter via cables.
- Maximum Power Point Tracking: Micro-inverters typically include an MPPT controller, which monitors the output voltage and current of the photovoltaic panels to ensure the maximum possible power is extracted from them.
- Inversion: The micro-inverter converts the DC power into AC power. During this process, it adjusts the output voltage and frequency to match the standard voltage and frequency of the household or commercial grid.
- Synchronization and Grid Connection: The micro-inverter must ensure that the generated AC power is synchronized with the grid. It also automatically stops operating in the event of grid instability or a power outage to ensure safety.
This concludes the introduction to the working principle of micro-photovoltaic inverters by Hengyuantai.