Inverters not only have the function of direct to alternating current conversion, but also have the function of maximizing the performance of solar cells and maintaining system faults. In summary, it has active operation and shutdown functions, maximum power tracking and control function, anti isolated 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 active operation and shutdown functions, as well as the maximum power tracking and control function.
1. Active operation and shutdown function: After sunrise in the morning, the intensity of solar radiation gradually increases, and the output of the solar cell also increases. When the required output power for the inverter task is reached, the inverter starts to operate actively. After entering operation, the inverter constantly monitors the output of the solar cell modules. As long as the output power of the solar cell modules is greater than the output power required for the inverter task, the inverter will continue to operate; Until sunset, the inverter can still operate even on rainy days. When the output of the solar cell module decreases and the output of the inverter approaches zero, the inverter enters standby mode.
2. Maximum power tracking control function: The output of solar cell modules varies with the intensity of solar radiation and the temperature of the solar cell module itself (chip temperature). Due to the characteristic of voltage decreasing with increasing current in solar cell modules, there exists an optimal task point for obtaining maximum power. The intensity of solar radiation is changing, and the optimal task point is also changing. Regarding these transformations, the task point of the solar cell module has always been at its maximum power point, and the system has been obtaining 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).
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