For the first time it has been possible to model a three-level Voltage Source Converter (VSC) and test the physical firing pulse controls using a Real Time Digital Simulator (RTDS®). The new RTDS model is more flexible and comprehensive than both earlier digital versions and analogue TNA models. This allows more tests to be conducted in a shorter time and provides a more detailed power system representation for the tests. Using the new system to test the controls also simplifies the recording of results since all signals can now be gathered by the RTDS Simulator.
For the case of Electric Arc Furnace (EAF) compensation, the new real time digital simulation has made it convenient and easy to demonstrate the flicker improvement factor provided by the actual VSC controls under realistic system conditions.
The paper compares results from off-line and real time RTDS simulations, as well as from field measurements taken at a full scale ABB SVC Light® installation. The good correlation between simulation results and field measurements give confidence to the digital modeling.
T. Larsson, J. Hasler, P. Forsyth, T. Maguire, Presented at IPST 2007, Lyon France, June 2007, Session 24 Paper No. 76
KEYWORDS: Power electronics, Power system simulation, Pulse Width Modulation, Real time simulator, Static VAR compensators.