Development of a state variable-based static compensator model

The development and implementation of a static VAr (volt-ampere reactive) compensator (SVC) model for digital transient simulation packages are described. The SVC model consists of a 12-pulse thyristor controlled reactor (TCR) with a thyristor switched capacitor (TSC). The equations for the circuit are obtained in state variable form using graph theory techniques and result in accurate, numerically stable solutions. The switching of the TSC capacitors has been modeled in a novel manner that saves on storage and computation time. The method of interfacing the model to a power system transients program is discussed. The transients program can be used to model large power systems external to the SVC model. A demonstration of the use of the SVC model in a power system simulation with the EMTDC packager is presented.<>