Distance Relay-Based Phasor Measurements for Protection of Transmission Lines with UPFC.

Document Type : Research Studies

Authors

1 professor in Electric Engineering Dept. Faculty of Engineering, Univ., Egypt

2 master degree program in Electric Engineering Dept. Faculty of engineering, Mansoura Univ., Egypt

Abstract

The Flexible AC Transmission System (FACTS) devices are used in modern electric power system to increase the capacity of the transmission lines and dynamic/transient stability limits. However, the FACTS devices cause mal-operation of the protective relays. So, the protective relaying schemes of transmission lines must be modified for achieving grid security and integrity. This paper studies the influence of the reactive power compensation on the performance of the Mho distance relays used to protect transmission lines. It deals with UPFC impact on the Mho distance relay using analytical and simulation techniques. Then, an adaptive Mho relay is developed in MATLAB/Simulink environment based on Phasor Measurement Units (PMUs). The developed Mho relay is used to exclude the effect of the UPFC in the fault loop. The performance of the adaptive relay is compared with the conventional Mho relay. The results prove the reliability and viability of the proposed adaptive relay. 

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