Koji Temma

Managing fault-induced delayed voltage recovery in Metro Atlanta with the Barrow County SVC

Georgia Transmission Corporation (GTC) commissioned the Barrow County Static Var Compensator (SVC) with a continuous rating of 0 to +260 Mvar in June of 2008. This paper presents the northern Metro Atlanta Georgia area transmission system, the requirements for voltage and var support, the dynamic performance study used to verify performance of the SVC, and provides an overview of the SVC design and control strategy, including the SVCs response to an actual power system disturbance. The Barrow County SVC is connected to the 230 kV bus at the Winder Primary Substation to effectively manage the exposure to fault-induced delayed voltage recovery (FIDVR), where the system voltage remains low (≪80%) for several seconds following a disturbance and potentially leading to voltage collapse. The SVC configuration includes two thyristor-switched capacitors for rapid insertion of reactive power following a disturbance to decrease voltage recovery time and control the systems dynamic performance.

Dynamic voltage support with the rector SVC in California’s San Joaquin Valley

Southern California Edison (SCE) commissioned the rector static Var compensator (SVC) with a continuous rating of -120 to +200 Mvar in June of 2007. This paper presents the big creek corridor portion of the San Joaquin Valley transmission system, the requirements for voltage and var support, the planning and dynamic performance studies used in rating and verifying performance of the SVC, and provides an overview of the SVC design and control strategy. The rector SVC is connected to the 230 kV bus at SCEs Rector substation for dynamic var support to meet the transient voltage dip reliability requirements of the Western Electricity Coordinating Council (WECC), and to enhance local and remote steady-state voltage control. The SVC configuration includes six thyristor valve controlled/switched branches, six harmonic filter branches, and employs coordinated control of a local 230 kV mechanically switched capacitor (MSC) bank to ensure sufficient dynamic vars remain available for system disturbances.