The inverter not only has the function of direct AC conversion, but also has the function of carrying out the solar battery function and the system fault maintenance function to the maximum extent. In summary, there are active operation and shutdown functions, maximum power tracking control function, anti-standalone operation function (for grid-connected systems), active voltage adjustment function (for grid-connected systems), DC detection function (for grid-connected systems), and DC ground detection. Function (for grid-connected system). Here we briefly introduce the active running and stopping functions and the maximum power tracking control function.
1. Active operation and shutdown functions: 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 take care of the output of the solar cell module at any time. 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 run; The inverter can also work in rainy days. When the output of the solar cell module becomes small and the inverter output approaches 0, the inverter will form a standby mode.
2. Maximum power tracking control function: The output of the solar cell module is changed 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 characteristic that the voltage decreases with increasing current, there is an optimal task point for obtaining the maximum power. The intensity of solar radiation is changing, and obviously the best task point is also changing. Related to these changes, the task point of the solar cell module has been at the maximum power point, and the system has always obtained the maximum power output from the solar cell module. This kind of control is the maximum power tracking control. The biggest feature of the inverter used in solar power generation system is to include the function of maximum power point tracking (MPPT).
