Inverters not only have direct-to-alternating power conversion functions, but also have the function of limiting the functions of solar cells and system fault maintenance. Summed up active operation and shutdown function, maximum power tracking control function, anti-self-operation function (for grid system), active voltage adjustment function (for grid system), DC detection function (for grid system), DC grounding detection Function (for grid system use). Here we briefly introduce active operation and shutdown functions and maximum power tracking control functions.
1. Active operation and shutdown function: After sunrise in the morning, the solar radiation intensity is gradually strengthened, and the output of the solar cell is also increased. After reaching the output power required by the inverter task, the inverter automatically starts operation. After entering the operation, the inverter will monitor the output of the solar cell module every moment, and only if 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; until sunset, even if it stops Rainy days, inverters can also operate. When the output of the solar cell module becomes smaller and the output of the inverter approaches zero, the inverter constitutes a standby mode.
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 characteristic that the voltage decreases with the increase of the 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. In relation to these changes, the task point of the solar cell module is always at the maximum power point, and the system always obtains the maximum power output from the solar cell module. This moderation is the maximum power tracking control. The biggest feature of inverters used in solar power systems is the inclusion of maximum power point tracking (MPPT).