Black-start circuit structure of low-voltage energy storage system and control method

Abstract

The invention relates to the technical field of power electronics, and particularly discloses a black-start circuit structure of a low-voltage energy storage system and a control method. The black-start circuit structure comprises a mains supply module, an energy storage battery module, a control module, an alternating current-direct current conversion module, a direct current-direct current conversion module, an isolation module and an output module connected with a load, wherein the input end of the control module is connected with the mains supply module and the energy storage battery module, the output end of the control module is connected with the alternating current-direct current conversion module and the direct current-direct current conversion module, the input end of the isolation module is connected with the alternating current-direct current conversion module and the direct current-direct current conversion module, and the output end of the isolation module is connected with the output module. By means of the mode, electricity can be directly taken from the energy storage battery module to serve as a black-start power source, a UPS does not need to be used, the black-start time is prolonged, the maintenance cost is reduced, and the installation space is saved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a black-start circuit structure and a control method of a low-voltage energy storage system. Background technique [0002] With the wide application of renewable new energy sources such as photovoltaics, and the demand for higher power supply reliability in industry and commerce, microgrid technology has developed rapidly. Renewable energy is greatly affected by the meteorological environment and has the disadvantage of intermittent operation. As an energy storage system, the energy storage system overcomes the time or local difference between the energy supply and demand of new energy power generation. It is a microgrid. important parts of. [0003] The black start of the energy storage system refers to the normal start-up operation of the entire energy storage system through the internal components of the energy storage system without relying on the help of other pow...

AI Technical Summary

Problems solved by technology

However, the battery inside the UPS generally has a small capacity, and the backup time is short. There is a disadvantage that the UPS cannot be started due to power consumption and power feeding when it is not connected to the mains for a long time.

If a battery with a larger capacity is used, the cost will be higher, and the larger equipment will occupy the installation space, which will also increase the cost, and the cycle life of the battery is short, so it needs to be checked regularly to see if it needs to be replaced, which increases the maintenance cost

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