中文摘要：

提出了一种基于广域测量系统（WAMS）的后备距离保护新方案。该方案利用WAMS传递对端系统阻抗信息,并利用序分量网络建立电流关系式。联立频域方程,推导出包含3个未知量的线性测距方程,利用矩阵束算法提取的工频量与高频量求解故障距离。所提方案充分利用共享信息,不受系统频率波动与振荡以及对端系统阻抗未知造成的影响,提高了保护的可靠性与耐受过渡电阻的能力,求解过程简单、快速,适用于单回线和双回线模型。在EMTP中进行仿真,仿真结果验证了所提方案的正确性和有效性。

英文摘要：

A backup distance protection scheme based on WAMS（Wide Area Measurement System） is proposed,which transmits the impedance information of far-end system via WAMS and constructs the current relationship formula with the sequence component network. With the simultaneous frequency-domain equations,a linear fault location equation with three unknown coefficients is deduced,and with the fundamental-frequency and high-frequency components extracted by the matrix pencil method,the fault distance is obtained. The proposed scheme makes full use of the shared information and,unaffected by the frequency fluctuation,the system oscillation and the unknown far-end system impedance,it enhances the reliability and transition resistance enduring ability of protection. Its solving process is simple and fast, suitable for both single-and dual-loop line models. Simulation is carried out with EMTP and results show the accuracy and effectiveness of the proposed scheme.