Control circuit of electrical secondary side of unified power flow controller

The invention relates to the field of electrical equipment control, and specifically relates to a control circuit of an electrical secondary side of a unified power flow controller. According to the invention, an anti-tripping loop is arranged in a tripping loop, a circuit breaker operating mechanism can lock the tripping loop when a series transformer breaks down until a tripping signal is recovered, and the circuit breaker is prevented from tripping again after being closed by the protection action. Two sets of closing coils and two sets of tripping coils are designed at the same time, the anti-tripping loops are respectively designed in the two sets of tripping loops, and a three-phase inconsistent protection circuit is designed in a closing loop, so that the closing reliability of thecircuit breaker can be improved, the conditions of closing rejection and wrong opening of the circuit breaker can be avoided, the closing of a bypass circuit breaker can be effectively ensured, and aseries transformer incomin