Analyze of Transient Current Characteristics of Hybrid DC Circuit Breaker in 500 kV VSC-HVDC Grid

doi:10.12204/j.issn.1000-7229.2022.10.005

Abstract

Abstract:

DC circuit breaker(DCCB)is an effective means to solve the problem of DC side fault clearing of VSC-HVDC grid, and hybrid DCCB is currently one of the most mature technical routes. The development speed of the DC side fault of VSC-HVDC grid is fast and its process is complex. The study of the transient current (TC) characteristics of hybrid DCCBs in this case has important reference value for the design and development of DCCBs. Considering the real control and protection logic of VSC-HVDC grid after short-circuit fault and the action sequence of AC breakers and DCCBs, this paper analyzes the time-varying characteristics of the paths of the TC of DCCBs, deduces the expression of each development stage of TC, proposes the typical waveform of TC stress of each branch of DCCB. It provides a basis for the selection and the parallel number design of IGBT devices in DCCB. At the same time. Aiming at the problems that the TC stress of the main branch of the DCCB is severe and there is no effective improvement method, a TC suppression method of DCCB based on damping resistors in converter station is proposed. The results of electro-magnetic transient simulation show that the proposed method can effectively suppress the TC of the main branch of DCCB after faults.

Key words: VSC-HVDC grid, hybrid DC circuit breaker, transient current, suppression method

CLC Number:

TM773

WEN Weibing, WEI Zheng, LAI Jiaxiang, SHI Yan, YANG Yong, WANG Jialong. Analyze of Transient Current Characteristics of Hybrid DC Circuit Breaker in 500 kV VSC-HVDC Grid[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(10): 48-57.

Figures/Tables 24

Fig.1 Topology of hybrid DC circuit breaker

Fig.2 Schematic diagram of currents of each branch and voltage of hybrid DCCB

Fig.3 Framework of the 4 sides VSC-HVDC grid

Fig.4 Main circuit of positive pole of station 1

Fig.5 Equivalent circuit after fault of single converter inducing transient current in DCCB

Fig.6 Equivalent circuit of VSC-HVDC grid when 0≤t≤Tb

Fig.7 Schematic diagram of DCCB transient current in case of DCCB acting normally

Fig.8 Action sequence in the case of DCCB failure

Fig.9 Equivalent circuits after the fault of VSC_HVDC grid in case of DCCB failure

Fig.10 Schematic diagram of DCCB transient current in case of DCCB failure

Fig.11 Working mode of the new damping resistances

Fig.12 Fault equivalent circuits with new damping resistances when T4<t≤T5

Table 1 Main parameters of each converter station of the VSC-HVDC grid in PSCAD model

Table 2 Action time of protection and equipments ms

Fig.13 Simulation result of DCCB transient current in case of DCCB acting normally

Fig.14 Simulation result of DCCB transient current in case of DCCB failure

Fig.15 Influence of the value of Lp on DCCB transient current in the case of DCCB acting normally

Fig.16 Influence of the value of Lp on DCCB transient current in case of DCCB failure

Table 3 Influence of Lp on current stress in DCCB

Fig.17 Influence of the value of I0_DCB on DCCB transient current in case of DCCB acting normally

Fig.18 Influence of the value of I0_DCB on DCCB transient current in case of DCCB failure

Table 4 Influence of I0_DCB on current stress in DCCB

Fig.19 Influence of the value of Rb on DCCB transient current in case of DCCB failure

Table 5 Influence of the value of Rb on current stress in DCCB main branch

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