Voltage and Transient Security Assessment in ERCOT Operations

This chapter looks at the Voltage and Transient stability considerations in the daily operations of the ERCOT system. We review the Voltage Stability assessments conducted as part of real-time operations and the need in ERCOT for a “system strength” metric. The Weighted Short Circuit Ratio (WSCR) proposed by ERCOT for this purpose is presented in detail. We also review the Transient Stability assessments conducted in real-time operations at ERCOT, starting with the West–North Interface and going through recent developments such as Transient Event Metrics in performing such assessments in daily operations.