One of the challenges brought about by the large wind portfolio in ERCOT is the presence of high/low frequency oscillations from wind generators driven by control systems with a bad setting in real-time. To address this, a study was undertaken to mine archived synchrophasor data from installed PMUs located near wind generators for oscillations and identify location, frequency of oscillation and minimum energy level. This project was carried out for Electric Reliability Council of Texas (ERCOT) as a part of the CCET Discovery Across Texas Project Funded by DOE.
The study identified 10 previously unknown and unmonitored oscillatory modes that appear to be associated with wind production and control system design and settings.
The results of this study informed the configuration of real-time tools for monitoring of and alerting for these oscillations. The study also provided an opportunity to review specific oscillations with wind plant owners to validate models and determine plausible termination of these modes.