Odessa Disturbance Event on June 4, 2022, (Odessa 2)
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Summary:
Event initiated by lightning arrestor fault on 345 kV level in Odessa area. The fault occurred on June 4, 2022, at 12:59:25 PM. Preliminary estimates are that a loss of 2,519 MW of thermal and IRR generation was experienced. The 1,666 MW of IRR generation loss was from 14 solar facilities and the other 853 MW was due to thermal generation loss. During the event, System Frequency declined to 59.706 Hz and recovered to 60 Hz in 1 min 20 sec. This event was Categorized as a NERC Cat 3 event (gen loss > 2000 MW). Most disturbing about this disturbance is that greater than two-thirds of the total loss of MWs was attributed to three OEM suppliers of equipment. Additionally, when compared to the 2021, Odessa Event (Odessa 1), greater than two-thirds of the MWs lost were also attributed to only three OEM suppliers.
Additional Discussion:
- Loss of 3 CC units within 2 different facilities
- 1st facility near Odessa where lightning arrestor fault occurred had 2 CC units trip/reduce output
- First CC generating ~333 MW tripped off with line to POI
- Second CC dropped ~210 MW immediately and ran back remaining ~287 MW over next 13 minutes
- 1st facility near Odessa where lightning arrestor fault occurred had 2 CC units trip/reduce output
- 2nd facility near Rio Grande Valley
- Tripped ~310 MW
- Root Cause unknown
- 14 facilities consisting of 19 units lost >10 MW
- Total estimated generation loss of 1,666 MW vs. 1,112 MW in Odessa event 2021
- Does not include generation that came back within 2 sec or fault clearing
- 9 of the 14 lost generation in Odessa event May 2021
- 8 identified in NERC Odessa Disturbance report (10 total facilities identified in report)
- Remaining 5 either in commissioning, offline, or rode through
ERCOT ACTIONS (short-term)
- 20 RFIs (requests for information) issued
- Due 6/24 @ 5PM – No extensions
- Reasons for inverter trips / MW reduction
- Protection and control function settings with setpoint and timing thresholds
- Corrective actions since Odessa 1
- PMU/DFR data requests issued
- All solar farms should have PMU data (ERCOT belief)
- NERC Brief (report)
