Current-Limiting Hybrid High Voltage DC Circuit Breaker with Reclosing Function

doi:10.12204/j.issn.1000-7229.2022.10.004

Abstract

Abstract:

DC circuit breaker is the core equipment for the stable operation of the DC transmission system. In order to design a DC circuit breaker which can solve DC fault detection and isolation and has reclosing function, a kind of current-limiting hybrid high voltage DC circuit breaker with reclosing function (RFL-HDCCB) is proposed. RFL-HDCCB topology utilizes the symmetry of current-limiting branch, which not only realizes the bi-directional fault-current breaking function, but also can complete the reclosing function. Whether it is a transient failure or a permanent failure, the recloser function can be realized to restore the normal power supply of the system. By studying and analyzing the working principle of RFL-HDCCB in stages, the parameters of RFL-HDCCB are designed, and finally, the PSCAD software is used to build the system simulation model for verification. The simulation shows that, compared with the traditional circuit breaker, the proposed HVDC circuit breaker with RFL-HDCCB topology can not only effectively reduce the rise rate of fault current and reduce the energy consumption requirements of lightning arrester, but also reduce the breaking pressure of mechanical switch, and has obvious current-limiting capacity, which reflects the rationality of the proposed scheme.

Key words: DC circuit breaker, reclosing, current limiting capacity, energy consumption of arrester, fault clearance

CLC Number:

TM561

ZHANG Baoge, JIAO Yuemin, PING Shanyan, WU Boxiang. Current-Limiting Hybrid High Voltage DC Circuit Breaker with Reclosing Function[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(10): 37-47.

Figures/Tables 14

Fig.1 Topological structure of RFL-HDCCB

Fig.2 Pre-charge circuit diagram of Capacitor C

Fig.3 Diagram of normal closing sequence

Fig.4 Diagram of normal closing circuit

Fig.5 Relationship between C、idc and UC

Fig.6 Relationship between RL and iL

Fig.7 Relationship between L and idc

Table 1 Simulation parameters

Fig.8 Simulation waveform

Fig.9 Comparison of fault current and lightning arrester absorb energy under different schemes

Fig.10 Voltage waveform of T1, T2

Table 2 Comparison of three schemes

Fig.A1 Fault current path diagram

Fig.A2 Reclosing path diagram

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