Field test results for a 3-phase 12.47 kV 1 MVA power router

Abstract

The increasing load, increasing level of penetration of renewable energy and limited investment in transmission infrastructure have significantly increased the need for a smart, dynamically controllable grid. The authors have previously proposed a power flow control device to maximize asset utilization, improve reliability, and reduce congestion. The proposed “power router” is realized by augmenting an LTC-like transformer with a fractionally-rated direct AC converter. The paper will discuss the field test results of a 12.47 kV, 1 MVA three-phase power router installed on a 12.47 kV feeder. Description of the test feeder, the power router configuration, protection peripherals and initial test results are presented. The test results verify the power router design to address key design challenges associated with utility-grade equipment that includes requirement for high reliability and availability, long life in excess of 20 years with limited or no maintenance schedule, rugged and often harsh operating environment, high BIL ratings and high fault-handling capabilities.