The utility model relates to the technical field of
coal-fired power
plant power
system emergency power supply, and particularly relates to a
coal-fired power
plant high reliability emergency power supply
system based on all-
vanadium liquid
flow battery, which comprises an all-
vanadium liquid
flow battery system, a bidirectional converter, a grid-connected
circuit breaker, an intelligent
microgrid controller and a safety protection device. The all-
vanadium liquid
flow battery system comprises an electric
pile, positive and negative
electrolyte storage tanks, a
circulating pump and a battery
management system. The
direct current output end of the all-vanadium liquid flow
battery system is connected to the
direct current side of the bidirectional converter, and the
alternating current side of the bidirectional converter is connected to the 380V power distribution section of the power
plant through the grid-connected
circuit breaker. The system cooperates with the auxiliary power to operate normally and assists in peak regulation. When a fault occurs, the intelligent
microgrid controller triggers seamless switching to an off-grid mode within 50 milliseconds, and independently carries the key load. The utility model solves the problems of slow switching and low reliability of traditional emergency power supply, is
environmentally friendly and safe, and is modular in design, which facilitates expansion and maintenance and is suitable for emergency power supply of key equipment in
coal-fired power plants.