The Functional Role Of Solar Inverters

The inverter not only has the function of direct AC conversion, but also has the function of maximizing the functionality of solar cells and maintaining system faults. It can be summarized as active operation and shutdown function, maximum power tracking control function, anti independent operation function (for grid connected systems), active 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 functions of active operation and shutdown, as well as the maximum power tracking control function.
1. Active 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 task is reached, the inverter starts to operate actively. After entering operation, the inverter will constantly monitor the output of the solar cell module. As long as the output power of the solar cell module is greater than the output power required for the inverter task, 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 mode.
2. Maximum power tracking control function: The output of solar cell modules changes with the intensity of solar radiation and the temperature of the solar cell module itself (chip temperature). Due to the characteristic that the voltage of solar cell components decreases with the increase of current, there is an optimal task point for obtaining maximum power. The intensity of solar radiation is changing, and clearly the optimal task point is also changing. Regarding 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. This control is called maximum power 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).