PNW Smart Grid Demonstration Project

Improve Power Quality & Reliabilty

Smart Grid >> Improve Power Quality & Reliability
Improve Power Quality Improve Electrical Power Quality and Reliability

The WSU PNW Smart Grid Demonstration Project scope includes three elements supporting this goal:

GAH 15kV ATS: Provide a 15kV Automatic Transfer Switch (ATS) on the electrical service to the new Global Animal Health (GAH) facility. This measure takes advantage of the availability of two nearby Avista circuits supplied from different Avista substations. A review by Avista indicated there were only two simultaneous power outages on these circuits in the last 5 years, with the over-lapping outage time in each instance being less than 5 seconds. If power is lost on one circuit, the ATS will automatically switch to the remaining circuit, providing a high level of service reliability and reducing the backup generator needs significantly.

IVVC Voltage Regulation/Conservation Voltage Reduction: Deploy Integrated Voltage-VAR Controls (IVVC) to improve electrical power quality. This measure includes the addition of switched capacitor banks on the 13.2kV distribution systems to improve power factor, and providing voltage signals from selected “End-of-Line” SEL-735 meters to the 13.2kV Voltage Regulators at the Avista Substations, allowing the Regulators to adjust based on the actual building voltages instead of an estimated voltage drop. This measure will allow the campus building voltages to be stabilized closer to the nominal system voltage.

CASP Substation Automation: Integrate an automated outage response system at the WSU College Avenue Steam Plant (CASP) substation. The CASP substation has double-ended switchgear with the two sections supplied from two diverse Avista electrical circuits, creating a situation similar to that at GAH as discussed above. If power is lost on one of the circuits, the new system will isolate the substation from the failed circuit, close a tie breaker, and re-energize some of the feeders that lost power, up to the capacity of the remaining circuit. When power is restored to the failed Avista circuit, the automated system will reconfigure the switchgear back to the normal arrangement with closed transition switching to avoid additional outages on the feeders that were previously re-energized from the second circuit.

WSU Benefits
  • The Global Animal Health automatic transfer switch and the CASP Automation measures both maximize use of existing power system resources for backup power, reducing the significant impacts that outages cause to the campus core mission
  • The IVVC measure will improve the quality of power on the campus systems while reducing power costs 1-2% annually ($110,000-$220,000)
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