Design and Simulation of High Voltage DC Circuit Breaker Based on Voltage Source Inverter Assisted Oscillation

According to the characteristics of voltage source converter-based high-voltage dc (VSC-HVDC) transmission systems, this paper analyzes the shortcomings of existing high-voltage DC circuit breakers, and based on this, proposes a high-voltage DC circuit breaker topology using voltage source inverter to assist current oscillation. This circuit breaker has the advantages of fast breaking speed, low on state loss, and low cost. Based on the proposed topology structure, the working principles of each stage of the circuit breaker were analyzed, and parameter design methods for various parts of the circuit breaker, such as oscillation inductance, oscillation capacitance, energy storage capacitance, and lightning arrester, were provided. Based on the design parameters, a simulation model was established on the PSCAD/EMTDC simulation platform to analyze the working performance of the circuit breaker when breaking a 10kA short circuit current at a 10 kV voltage level. The results indicate that the circuit breaker can reliably break short-circuit current and achieve effective isolation of short-circuit faults.