Functions of photovoltaic inverters

The transformer not only has the function of direct AC conversion, but also has the function of system fault protection to maximize the performance of solar cells. In summary, there are automatic operation and shutdown functions, maximum power tracking control function, separate operation function (for grid connected systems), automatic voltage adjustment function (for grid connected systems), DC detection function (for grid connected systems), and DC grounding detection function (for grid connected systems). Here is a brief introduction to the automatic operation and machine function, as well as the maximum power tracking control function.

1. Automatic operation and shutdown function: After sunrise in the morning, the solar radiation intensity gradually increases, and the output of the solar cell also increases. When the output power required for the inverter to work is reached, the inverter automatically starts running. After entering operation, the inverter constantly monitors the output of the solar cell module. As long as the output power of the solar cell module is greater than the output power of the inverter, the inverter will continue to operate; Until sunset, the inverter can operate even on cloudy and rainy days. When the output of the solar cell module decreases and the inverter output approaches 0, the inverter forms a standby state.

2 The output of the maximum power tracking control function solar cell module is dependent on the intensity of solar radiation and the temperature of the solar cell module itself The temperature of the chip varies. Additionally, due to the characteristic of the solar cell module that the voltage decreases with the increase of current, there is an optimal operating point for obtaining maximum power. The intensity of solar radiation is variable, and obviously the optimal operating point is also variable. Compared to these changes, always keep the operating point of the solar cell module at the maximum power point, and the system begins to obtain the maximum power output from the solar cell module. This control is the maximum power output Tracking control. The biggest feature of the inverter used in solar power generation systems is that it includes the function of Maximum Power Point Tracking (MPPT).