Title: Modelling and validation of differential relay using real time digital simulator
Authors: Vamsi K. Vijapurapu; Anurag K. Srivastava; Noel N. Schulz
Siemens Industry, Inc., 60 Colony Square, Pittsburgh, PA, USA
The School of Electrical Engineering and Computer Science, Washington State University, P.O. Box 642752, 102 Spokane Street, Pullman, WA, USA
Department of Electrical and Computer Engineering, Kansas State University, 2077, Rathbone Hall, Manhattan, KS, USA
Abstract: The differential relay is often used as a protective device for transformer and bus protection. This paper focuses on the design, testing and validation of a differential protection scheme using a real time digital simulator (RTDS). Hardware-in-the-loop (HIL) simulation has been done using the commercial differential relay hardware and the RTDS system. Simulation results obtained using developed software relay model were compared with simulation results of HIL to validate the basic functionality performance of the relay model. The developed model has increased flexibility and can be used to develop an advanced relay model with a dynamic pickup value for a system with frequent critical topological changes. Developed relay model and HIL hardware setup can also be used for power system education. Contributions of this paper is to develop a framework for model validation using HIL and real time simulation interface to be used in further power system research and education.
Keywords: HIL; hardware-in-the-loop; simulation techniques; complex systems; real-time systems; embedded systems; RTDS; real time digital simulator; differential relays; bus protection; relay modelling; model validation; shipboard power systems; SEL-487B; Schweitzer Engineering Laboratories; protective devices; transformer protection; differential protection; software relay models; functionality performance; dynamic values; pickup values; topological changes; simulation interfaces; energy technology; energy policy.
Int. J. of Energy Technology and Policy, 2012 Vol.8, No.3/4/5/6, pp.305 - 322
Date of acceptance: 18 Sep 2012
Available online: 13 Feb 2013