Off-grid inverter and control method based on new energy and mains complementary power supply

Abstract

The invention discloses an off-grid inverter and a control method based on complementary power supply of new energy and commercial power. The inverter includes a battery, a controller, a new energy charging unit and a rectifier. The method includes: adjusting and controlling the power of the rectifier according to the detected charging current, so that the battery is charged in a constant current charging manner, or adjusting and controlling the power of the rectifier according to the detected charging voltage, so that the battery Charge with floating charge. By using the invention, the storage battery does not need to be frequently charged and discharged, and the quality and reliability of the inverter power supply can be improved, and the continuity and stability of the inverter power supply can be greatly improved. The present invention can be widely used in the field of inverters as an off-grid inverter and a control method based on complementary power supply of new energy and mains electricity.

Description

technical field [0001] The invention relates to the power supply technology of an inverter, in particular to an off-grid inverter based on complementary power supply of new energy and commercial power. Background technique [0002] The traditional solar off-grid inverter works as follows: solar energy charges the battery of the inverter and supplies power to the load through the output voltage of the inverter. If the solar power is less than the load power, the voltage of the battery of the inverter will decrease. When the battery When the voltage is lower than a certain value, such as 10.5V / cell, the off-grid inverter switches to the bypass, the utility power supplies power to the load through the bypass, and charges the battery through the rectifier. When the battery voltage returns to a specific voltage, such as 13V, the off-grid inverter switches from the bypass to the inverter to supply power to the load. In this process, there are some disadvantages as follows: the ba...

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Problems solved by technology

In this process, there are some disadvantages as follows: the battery will be charged and discharged frequently, which is easy to shorten the life of the battery; when the battery is under low voltage, the mains power is disconnected, so the backup time cannot be guaranteed; when the load is powered by bypass, the quality of power supply Not as stable as inverters

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