This paper describes a method of developing wide-band multi-port system equivalents for use with real-time digital power system simulators. The proposed equivalent combines a frequency dependent network equivalent (FDNE) for the high frequency electromagnetic transients and a transient stability analysis (TSA) type simulation block for the electromechanical transients. The frequency dependent characteristic for FDNE is obtained by curve-fitting frequency domain admittance characteristics using the vector fitting method. The paper also introduces an approach for approximating the frequency dependent characteristic of large power networks from readily available typical power-flow data. The paper shows how the TSA algorithm can be adapted to a real-time platform. The validity of this method is confirmed with examples, including the study of a multi in-feed HVDC system based network.
X. Lin, A. M. Gole and M. Yu, "A Wide-Band Multi-Port System Equivalent for Real-Time Digital Power System Simulators," in IEEE Transactions on Power Systems, vol. 24, no. 1, pp. 237-249, Feb. 2009, doi: 10.1109/TPWRS.2008.2007000.
KEYWORDS: Dynamic equivalent, electromagnetic transient, frequency dependent network equivalent, power system simulation, real-time digital simulator, transient stability.