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电网技术  2014 

利用高低频电流幅值比的VSC-HVDC输电线路全线速动保护新原理

DOI: 10.13335/j.1000-3673.pst.2014.05.043, PP. 1402-1407

Keywords: 电压源换流器型直流输电,单端电流,高频电流分量,低频电流分量,电流分量幅值比,继电保护

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Abstract:

VSC-HVDC(voltagesourceconverterHVDC)控制系统复杂,故障承受能力差,研究适用于VSC-HVDC系统的高性能保护十分必要。对VSC-HVDC直流输电系统结构及边界特性的分析发现,输电线路两侧的大电容,因其对高频信号呈现低阻抗的特性,使得输电线路区内、外故障时,直流线路两端保护安装处感受到的电流信号频率成分存在差异。利用此特点,提出一种仅利用单端电流量的VSC-HVDC输电线路全线速动保护新原理,该原理采用高、低频电流的幅值比来区分直流线路的区内、外故障,该比值在区外故障时小,区内故障时大。本原理能够实现区内、外故障的判别,对采样频率要求不高,动作速度快,受过渡电阻影响小。利用PSCAD进行故障分析,大量仿真结果表明,该原理能可靠区分直流输电线路的区内、外故障。

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