A black start method for a megawatt-level all-vanadium flow battery system device

Abstract

The invention relates to the technical field of energy storage batteries, in particular to a black start method for a megawatt-level all-vanadium flow battery system. The megawatt-level all-vanadium flow battery system mainly comprises a power conversion unit, all-vanadium flow battery unit, and black start unit. The power conversion unit comprises a PCS converter; The all-vanadium flow battery unit comprises a positive electrolyte storage tank, a negative electrolyte storage tank, a positive electrolyte circulating pump, a negative electrolyte circulating pump, a stack, a battery management system BMS, a frequency converter A, a frequency converter B, and a megawatt-level DC-DC converter, PLC, communication line; and the black start unit comprises a black start battery and a BMS module, acurrent sensor N, a data acquisition or control module U. The invention can realize that the all-vanadium liquid flow battery system can be started under any circumstances, and has the advantages that: the frequency converter drives the circulating pump to work, and the motor control and regulation can be optimized; The battery power required for the black start process is very small, and the megawatt-level liquid flow battery system can be started with minimum power.

Description

technical field [0001] The invention relates to the technical field of energy storage batteries, in particular to a black start method for a megawatt-level all-vanadium redox flow battery system. Background technique [0002] All-vanadium redox flow battery is a new type of energy storage equipment, which has outstanding advantages such as long service life, large energy storage scale, good battery uniformity, safety and reliability, and has become one of the preferred technologies for large-scale energy storage. Power generation and energy-saving technology and other fields have extremely broad application prospects. Compared with other non-flow battery systems, the remarkable feature of the all-vanadium flow battery system is that the flow battery needs to rely on the circulating pump to charge and discharge normally. After the system stops the circulation pump, it will not be self-starting without external power supply or backup battery. In addition, it is necessary to ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a black-start method for a megawatt-class all-vanadium redox flow battery system device to solve the problems of the prior art that there is no external battery or a backup battery that cannot be started, the power of the backup battery and the cycle Problems such as starting power coordination of pumps, etc.

Images