A current‐limiting DC circuit breaker with power flow control capability

Abstract

Power flow controller (PFC), fault current limiter (FCL) and DC circuit breaker (DCCB) are important equipment in the DC grid. There are a large number of power electronic components in these equipment, resulting in high cost. In order to reduce the use of additional components, a current‐limiting DC circuit breaker with power flow control capability is proposed here, which integrates the PFC, FCL, and DCCB into one equipment. Further, the main breaker in the proposed circuit breaker is shared by all lines connected to a DC bus to reduce cost. The topology and operating principle of the circuit breaker are introduced. Theoretical analysis and parameter design are carried out. Besides, the proposed circuit breaker is verified in PSCAD/EMTDC. Finally, the performance and cost are compared with existing schemes. The simulation results show that the proposed circuit breaker can effectively realize power flow control, current limiting and fault isolation at a lower cost.

Research on strength and fatigue model of circuit breaker energy storage spring based on SVM algorithm

“…[1]. In response to the above issues, in order to increase the mechanical reliability of circuit breakers, it is urgent to analyze the motion characteristics and stress distribution of the circuit breaker operating mechanism [2][3]. Among them, reference [5] proposes a vibration signal based method for detecting the fatigue degree of high-voltage circuit breaker springs, which is one of the more common methods.…”

A versatile series‐parallel‐connected bidirectional DC power flow controller for HVDC and MVDC system

“…The IDCPFC has simple topology, small switching stress and lower losses. Nevertheless, the limitations are obvious that it can only be applied to multiple lines at the same time and cannot simultaneously increase or decrease the power flow of those regulated lines [19][20][21][22][23][24][25]. For dc transformer type DCPFC, the drawback is that it has to apply a huge number of devices to deal with a high-power throughput.…”