What does a solar inverter do?

 

Inverter, also known as power regulator and power regulator, is an indispensable part of photovoltaic system. The main function of the PV inverter is to convert the DC power generated by the solar panel into the AC power used by household appliances. All the power generated by the solar panel can be output only after being processed by the inverter. [1] Through the full bridge circuit, the SPWM processor is generally used for modulation, filtering, boost, etc. to obtain sinusoidal AC power matching with the lighting load frequency, rated voltage, etc. for the use of the system end users. With inverter, DC battery can be used to provide AC power for electrical appliances.

The solar edge inverter not only has the DC/AC conversion function, but also has the function to maximize the development of solar cell function and system fault maintenance function. It can be summed up as active operation and shutdown, maximum power tracking and control, independent operation prevention (for grid connected system), active voltage regulation (for grid connected system), DC detection (for grid connected system), and DC grounding detection (for grid connected system). Here, we briefly introduce the functions of active operation and shutdown and maximum power tracking control.

1. Functions of active operation and shutdown: after sunrise in the morning, the solar radiation intensity gradually increases, and the output of solar cells also increases. When the output power required by the inverter task is reached, the solar edge inverters will start to operate actively. After entering into operation, the inverter will watch the output of the solar cell module at all times. As long as the output power of the solar cell module is greater than the output power required by the inverter task, the inverter will continue to operate; Until sunset, the inverter can operate even in rainy days. When the output of the solar cell module decreases and the output of the inverter approaches zero, the inverter will form a standby mode.

2. Maximum power tracking control function: the output of the solar cell panel changes with the solar radiation intensity and the temperature of the solar cell module itself (chip temperature). In addition, because the solar cell module has the feature that the voltage decreases with the increase of current, there is an optimal task point to obtain the maximum power. The solar radiation intensity is changing, and obviously the best task point is also changing. With respect to these changes, the task point of the solar cell module has always been at the maximum power point, and the system has always obtained the maximum power output from the solar cell module, which is called maximum power tracking control. The biggest feature of the inverter used in the solar power generation system is that it includes the function of maximum power point tracking (MPPT).