Study on Fault Transient Characteristics of DC Distribution Network Based on Hybrid Flexible Current Limiter

doi:10.11985/2020.04.008

Abstract

Abstract:

A hybrid flexible current limiting strategy based on bridge is proposed for the short circuit between poles in DC distribution network. The current limiter consists of a superconducting current limiter and a self-excited current limiter controlled by a rectifier. When the system operates normally, the bridge circuit bypasses the current limiting device of the middle branch, so the current limiting device has no effect on the operation of the system. When there is a short circuit between the poles in the system, the bridge type circuit will naturally switch the current limiting device into the system. The superconductivity increases the resistance value in the fault circuit. While the current limiting inductance in the self-excited current limiter forms a reverse clamping voltage in the fault circuit, which reduces the voltage in the discharge circuit. The clamping voltage can be changed in the control circuit to control the fault current. Finally, through the Matlab/Simulink simulation platform, the distribution network model is built to verify the feasibility and effectiveness of the proposed current limiting strategy.

Key words: DC distribution network, short circuit fault between poles, resistance type superconductor, self-excited current limiter

CLC Number:

TM561

LI Qingbo, LIN Jiahao. Study on Fault Transient Characteristics of DC Distribution Network Based on Hybrid Flexible Current Limiter[J]. Journal of Electrical Engineering, 2020, 15(4): 65-74.

Figures/Tables 22

References 24

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参数	数值
直流侧极间电压/V	750
直流母线电流/A	40.2
桥型电路直流偏压/V	1.5
超导失超阻值/Ω	2
限流电感/mH	200