The unofficial ERCOT peak for October was 59,193 MW. There were six frequency events in October. PMU data indicates the ERCOT system transitioned well in each case. There were four instances where Responsive Reserves were deployed, all of which were the result of frequency events. There were seventeen RUC commitments in October. Seven in the Northern region, seven in the Southern region and three in the Coastal region. All were due to local congestion. The level of reportable SCED congestion decreased in October. This congestion was due primarily to planned outages and area load/gen patterns. There were thirteen days of activity on the Generic Transmission Constraints (GTCs) in October. This included one day of activity on the Laredo GTC, nine on the Zorillo Ajo GTC and three on the Valley Import GTC. – There were no significant system events for the month of October. ERCOT Applications performed well throughout the month. There were no ERCOT related application performance issues. The ERCOT Interconnection experienced six frequency events in October, all of which resulted from Resource trips. The average event duration was approximately 0:04:42. When analyzing frequency events, ERCOT evaluates PMU data according to industry standards. Events with an oscillating frequency of less than 1 Hz are considered to be inter-area, while higher frequencies indicate local events. Industry standards specify that damping ratio for inter-area oscillations should be 3.0% or greater. All events listed below indicate the ERCOT system met these standards and transitioned well after each disturbance. Reported frequency events will include both frequency events where frequency was outside the range of 60±0.1 Hz as well as those determined to be Frequency Measurable Events (FME) as defined by BAL-001-TRE-1. Delta Frequency is defined as the difference between the and post-perturbation frequency. The Duration of Event is defined as the time it takes for the frequency to recover to lesser/greater of the frequency at the time of the frequency event (t(0) or for low/high-frequency events, respectively. Further details on FMEs can “A-point”) be found in the MIS posted BAL-001-TRE-1 PDCWG Unit Performance reports. A summary of the frequency events is provided below: Delta Max/Min Duration Date and Time PMU Data Comments Frequency Frequency of Event
The unofficial ERCOT peak for October was 59,193 MW. There were six frequency events in October. PMU data indicates the ERCOT system transitioned well in each case. There were four instances where Responsive Reserves were deployed, all of which were the result of frequency events. There were seventeen RUC commitments in October. Seven in the Northern region, seven in the Southern region and three in the Coastal region. All were due to local congestion. The level of reportable SCED congestion decreased in October. This congestion was due primarily to planned outages and area load/gen patterns. There were thirteen days of activity on the Generic Transmission Constraints (GTCs) in October. This included one day of activity on the Laredo GTC, nine on the Zorillo – Ajo GTC and three on the Valley Import GTC. There were no significant system events for the month of October. ERCOT Applications performed well throughout the month. There were no ERCOT related application performance issues. The ERCOT Interconnection experienced six frequency events in October, all of which resulted from Resource trips. The average event duration was approximately 0:04:42. When analyzing frequency events, ERCOT evaluates PMU data according to industry standards. Events with an oscillating frequency of less than 1 Hz are considered to be inter-area, while higher frequencies indicate local events. Industry standards specify that damping ratio for inter-area oscillations should be 3.0% or greater. All events listed below indicate the ERCOT system met these standards and transitioned well after each disturbance. Reported frequency events will include both frequency events where frequency was outside the range of 60±0.1 Hz as well as those determined to be Frequency Measurable Events (FME) as defined by BAL-001-TRE-1. Delta Frequency is defined as the difference between the and post-perturbation frequency. The Duration of Event is defined as the time it takes for the frequency to recover to lesser/greater of the frequency at the time of the frequency event (t(0) or “A-point”) for low/high-frequency events, respectively. Further details on FMEs can be found in the MIS posted BAL-001-TRE-1 PDCWG Unit Performance reports. A summary of the frequency events is provided below: Date and Time Delta Frequency Max/Min Frequency Duration of Event PMU Data Comments
05._October_15_ERCOT_Operations_Report_Public.docx