Power system studies and modelling for the Kayenta 230 kV substation advanced series compensation

The Western Area Power Administration (WAPA) requires additional power flow capability between Shiprock substation in New Mexico and Glen Canyon power plant in Arizona. To increase power flow capability, it was decided to series compensate the transmission line by 72% at the existing Kayenta substation. The compensation will consist of two 55 ohm segments. Siemens, in association with Nokia, proposed to install the main capacitor segments but to divide the east 55 ohm bank into a 40 ohm section and an innovative flexible AC transmission device (FACTS) consisting of a thyristor controlled reactor (TCR) in parallel with a 15 ohm capacitor section. The FACTS device is known as an advanced series compensator (ASC). The authors present a discussion of the theoretical aspects of the ASC as well as ASC modelling considerations