This paper describes the method by which a large hardware-in-the-loop environment has been realized for 3-phase AC power systems. The environment allows an entire laboratory power network topology (generators, loads, controls, protection devices and switching) to be placed in the loop of a large power
network simulation. The system is realized by using a real-time power network simulator, which interacts with the hardware via indirect control of a large synchronous generator and by measuring currents flowing from its terminals. These measured currents are injected into the simulation via current sources to
close the loop. This paper describes the system architecture and, most importantly, the calibration methodologies which have been developed to overcome measurement and loop latencies. In particular a new phase advance calibration removes the requirement to add unwanted components into the simulated network to compensate for loop delay. The results of early commissioning experiments are demonstrated. The present system performance limits under transient conditions (approximately
0.25 Hz/s and 30 V/s to contain peak phase and voltage tracking errors within 5° and 1%) are defined mainly by the controllability of the synchronous generator.
A. J. Roscoe, A. Mackay, G. M. Burt and J. R. McDonald, "Architecture of a Network-in-the-Loop Environment for Characterizing AC Power-System Behavior," in IEEE Transactions on Industrial Electronics, vol. 57, no. 4, pp. 1245-1253, April 2010, doi: 10.1109/TIE.2009.2025242.
KEYWORDS: Power system simulation, Power system stability, Power system security, Power system protection, Calibration, Electric variables measurement, Real time systems, Digital control