DC solid state circuit breaker and broken circuit control method

Abstract

The invention discloses a DC solid state circuit breaker, which comprises a thyristor switch module, a commutation circuit, a crowbar circuit and a controller, wherein the commutation circuit is a T source impedance network; the crowbar circuit is composed of a controllable power electronic switch and a resistor R in series connection; the controllable power electronic switch control signal output end of the controller is connected with the control signal input end of the controllable power electronic switch; the thyristor control signal output end of the controller is connected with the control signal input end of the thyristor switch module; and the thyristor switch module, the commutation circuit and the crowbar circuit are in series connection. The method of the invention can solve problems such as time delay caused as the traditional circuit breaker has a slow breaking speed, detection, judgment, control and the like are needed for short circuit protection, ensures the DC system to be reliably cut off in the case of failure, and enhances reliability of the system.

Description

technical field [0001] The invention relates to the technical field of power switches, in particular to a DC solid state circuit breaker and a circuit breaker control method. Background technique [0002] In recent years, the application of DC power system in high-voltage direct current transmission system (HVDC), ship power system, rail transit and other fields has continued to expand, making the demand for DC power transmission and distribution system equipment continue to grow. As the key protection equipment of the system, DC circuit breakers have Wide application prospects. [0003] Since the current of the DC system does not have a natural zero-crossing point, the requirements for the circuit breaker used in the AC and DC systems are significantly different. Taking the DC system of a ship as an example, when a short-circuit fault occurs in the DC system, the current rise rate can reach more than 20A / μs , the peak current reaches more than 110kA, the traditional mechan...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a DC solid-state circuit breaker and a circuit breaker control method, the circuit breaker and circuit breaker control method can solve the traditional circuit breaker slow breaking speed, need detection, judgment, control, etc. for short circuit protection and cause delays and other problems , to ensure reliable shutdown of the DC system in the event of a fault, enhancing system reliability

Images