New Topology of Multi-port High-Voltage DC Circuit Breaker with Current-Limiting Function

doi:10.12204/j.issn.1000-7229.2021.11.002

Abstract

Abstract:

DC circuit breaker (DCCB) is the key equipment to ensure the safe and stable operation of DC power grid. For the existing DCCB, the cost is too high due to the large number of devices in operation, large current during short-circuit faults, and too much energy absorbed by the arrester. A power electronic multi-port HVDC circuit breaker (MP-DCCB) with current limiting is proposed. The performance of DCCB is studied by improving its topology. The working principle and fault breaking process of the new topology are analyzed theoretically. The relevant parameters and selection basis of the device are given. Finally, the corresponding simulation model is built and verified with PSCAD software. Compared with the conventional DCCB scheme, the fault current is reduced by 48.6%; the absorbed energy, turn-off current and turn-off time of the arrester are reduced by 54.8%, 52.4% and 0.8 ms, respectively. Therefore, the new MP-DCCB has good reliability and economy, and the simulation results verify that the new topology scheme of power electronic multi-port HVDC circuit breaker with current limiting can be applied to the DC power grid.

Key words: multi-port HVDC circuit breaker, current-limiting function, grounding branch, short-circuit fault, DC power grid

CLC Number:

TM72

ZHANG Baoge, SUN Rui. New Topology of Multi-port High-Voltage DC Circuit Breaker with Current-Limiting Function[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(11): 13-22.

Figures/Tables 13

Fig.1 MP-DCCB and fault location in a power system

Fig.2 Conventional two-port DCCB topology

Fig.3 New topology of MP-DCCB

Fig.4 Equivalent circuit outside MP-DCCB during a fault

Fig.5 Pre-charge current path of capacitor C1

Fig.6 Control timing of MP-DCCB

Fig.7 Breaking current path of MP-DCCB during a fault

Fig.8 The influence of capacitor C1 on power supply of thyristor and fault current i2

Fig.9 The influence of inductance LV on power supply of thyristor and fault current i2

Fig.10 Simulation diagram of MP-DCCB1

Fig.11 Performance comparison between new MP-DCCB and ABB solution

Table 1 Comparison of demand for element quantity between the new solution and ABB solution

Table 2 Comparison of demand for element quantity when circuit breaker protects n lines

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