基于相关系数分析的六相输电线路故障选相

Fault Phase Selection for Six-phase Transmission Lines Based on Correlation Coefficient Analysis

六相输电系统具有功率传输密度大、线路走廊窄、相间电压低等优点,受到越来越多的重视。文中在六相输电系统六序分量基础上,提出一种基于相关分析的六相输电线路故障选相法。采用六序分量法进行故障分析,有效消除互感,得到六序分量间电流特征;利用相关分析法迅速、准确地识别六序电流量间的相位关系,区分故障类型、确定故障相别。RTDS仿真测试表明,该选相方法不受分布电容和过渡电阻的影响,在各种运行方式和故障情况下都能够准确选相。

Six-phase transmission system gains more and more attention as it can effectively improve power transmission density with a narrow line corridor, and can lower phase to phase voltage. Based on correlation a- nalysis and six-sequence component, a new method of fault selection for six-phase transmission lines was proposed on in the paper. , which can effectively eliminate mutual inductance, and get the current characteristics between six sequence components. The method of correlation analysis is used to identify phase relationship between six sequence components quickly＇ and accurately to recognize fault types and determine fault phases. RTDS simulation tests show that the proposed method can overcome the disadvantages of distributed capacitance and transition resistances, and can correctly select phase at any kind of operation mode and fault condition.