Deployment of Traveling-Wave Relays (TWRs) in AC power systems promises enhancement of transmission system capacity and improvement of system stability margins by reducing the fault clearing time. As compared to traditional phasor-based relays, TWRs have more advanced hardware platforms and communication means to carry out Traveling-Wave (TW)-based protection algorithms. These algorithms are based on high-frequency responses of power systems after inception of a fault. A closed-loop scheme, where TWRs are interfaced with the realistically emulated system response prior and subsequent
to the fault detection, is necessary for rigorous testing prior to installation. Closed-loop TWR Testing (TWRT) is enabled by real-time simulation of accurate power system models using a simulation time-step in the microsecond range. This paper presents a Control Hardware-In-the-Loop (CHIL) simulation to
verify the stability margin enhancement of power systems with the use of TWRs. It elaborates modeling requirements of power system components in TW studies and presents two case studies on single-machine and multi-machine power systems. The CHIL simulation studies are conducted by connecting commercially available TWRs with a Digital Real-Time Simulator (DRTS). This paper (i) proposes a CHIL approach for TWRT for AC systems and (ii) verifies that TWRs improve the Transient Stability (TS)
of power systems.
R. Mirzahosseini, S. Arunprasanth, E. Tara, U. Samarasekera, Y. Zhang, presented at the International Conference on Power Systems Transients 2019 (IPST 2019)
KEYWORDS: Traveling-Wave Relay Testing, CHIL, Real-Time Simulation, Transient Stability