A Real-Time Synchrophasor-Based Zone-3 Supervision of Distance Relays Under Load Encroachment Condition
A Real-Time Synchrophasor-Based Zone-3 Supervision of Distance Relays Under Load Encroachment Condition
复制标题
负载侵入条件下基于同步相量的距离继电器 Zone-3 实时监控
作者：
Anmol Dwivedi;Mallikarjuna Balimidi;Diptak Pal;M. J. B. Reddy;D. Mohanta
本文提出了一种防止距离保护第三区域元件在负荷侵入时误动的实时监测保护算法。建议的监督算法控制的备份区（区3）的距离继电器的操作，通过分析从位于整个电力系统网络的相量测量单元（PMU）获得的同步相量数据。区域3元件固有的较高延迟时间和与PMU相关联的向中央控制中心传送信息的延迟的组合使得该算法适合于输电线路保护。通过对400 km超高压输电线路的实验室模型进行大量的实时实验，并在系统保护控制中心的LabVIEW平台上实现保护算法，验证了该方法的优越性。PMU已实现使用美国国家仪器公司（NI）紧凑型可重构输入输出嵌入式控制器，和同步相量估计算法部署使用LabVIEW现场可编程门阵列软件。从实验装置获得的结果验证了所提出的算法的实时实现的可行性。
This paper deals with the implementation of a real-time supervisory protection algorithm to avert the mal-operation of third zone element of distance relays during load encroachment. The proposed supervisory algorithm controls the operation of the backup zone (Zone-3) of distance relays by analyzing the synchrophasor data obtained from the phasor measurement units (PMUs) located throughout the power system network. The combination of the inherently higher delay time of Zone-3 element and the latency associated with PMUs to communicate information to the central control center makes the algorithm suitable for transmission line protection. The superiority of the proposed method is verified by conducting extensive real-time experiments on a laboratory model for a 400-km extra high voltage transmission line and implementing the protection algorithm on the LabVIEW platform at the System Protection and Control Centre. PMUs have been realized using National Instruments (NI) Compact Reconfigurable Input–Output embedded controllers, and the synchrophasor estimation algorithm is deployed using LabVIEW field-programmable gate array software. The results obtained from the experimental setup validate the viability of the proposed algorithm for the real-time implementation.