The inverter not only has the function of DC-AC conversion, but also has the function of maximizing the performance of the solar cell and the function of system failure protection. In summary, there are automatic operation and shutdown function, maximum power tracking control function, anti-independent operation function (for grid-connected system), automatic voltage adjustment function (for grid-connected system), DC detection function (for grid-connected system), DC grounding detection Function (for grid-connected system). Here is a brief introduction to the automatic operation and shutdown functions and 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 by the
inverter task is reached, the inverter starts to operate automatically. After entering the operation, the inverter will take care of the output of the solar cell module all the time. 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; The inverter can also run on rainy days. When the output of the solar cell module becomes smaller and the output of the inverter is close to 0, the
inverter will form a standby state.
2. Maximum power tracking control function: The output of the solar cell module 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 characteristics that the voltage decreases with the increase of the current, there is an optimal task point where the maximum power can be obtained. The intensity of solar radiation is changing, and so is the apparent optimal mission point. Regarding these changes, the task point of the solar cell module is always at the maximum power point, and the system has always obtained the maximum power output from the solar cell module. This control is the maximum power tracking control. The biggest feature of
inverters for solar power systems is that they include the function of maximum power point tracking (MPPT).
