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118323CONSTRAINTS19/09/2024 04:20:22 PM
Update to system normal constraint equation in NSW for transient voltage stability in south-west NSW
AEMO ELECTRICITY MARKET NOTICE
Refer to market notice 92840.
Transgrid has advised AEMO of an update to the transient voltage stability limit in south-west NSW for loss of Darlington Point to Wagga (63) 330 kV line. The limit will include terms for the Darlington Point and Riverina BESS.
The following constraint equation will be updated with the above changes at 1100 hrs Friday 20th September 2024.
N::N_NIL_63
For full details on the formulation, the new constraint equation has now been loaded into AEMO's pre-production systems.
For further details on these constraint equation please contact ben.blake@aemo.com.au
Ben Blake
AEMO Operations
Refer to market notice 92840.
Transgrid has advised AEMO of an update to the transient voltage stability limit in south-west NSW for loss of Darlington Point to Wagga (63) 330 kV line. The limit will include terms for the Darlington Point and Riverina BESS.
The following constraint equation will be updated with the above changes at 1100 hrs Friday 20th September 2024.
N::N_NIL_63
For full details on the formulation, the new constraint equation has now been loaded into AEMO's pre-production systems.
For further details on these constraint equation please contact ben.blake@aemo.com.au
Ben Blake
AEMO Operations
118319GENERAL NOTICE19/09/2024 01:45:31 PM
Planned outage of Tailem Bend - South East 275 kV transmission line in the South Australia region beginning on 20/09/2024
AEMO ELECTRICITY MARKET NOTICE
The Tailem Bend - South East No 1 275 kV line in the South Australian (SA) region is planned to be out of service from 2100 hrs on 20/09/2024 to 0530 hrs on 21/09/2024.
A credible contingency event during this planned outage could cause synchronous separation of the SA region from the rest of the NEM.
During this planned outage:
- Power transfer will be restricted across the VIC - SA interconnector (Heywood interconnector); and
- Post contingent FCAS will be sourced within SA following Separation event.
Refer AEMO Network Outage Schedule (NOS) for further details.
AEMO Operations
The Tailem Bend - South East No 1 275 kV line in the South Australian (SA) region is planned to be out of service from 2100 hrs on 20/09/2024 to 0530 hrs on 21/09/2024.
A credible contingency event during this planned outage could cause synchronous separation of the SA region from the rest of the NEM.
During this planned outage:
- Power transfer will be restricted across the VIC - SA interconnector (Heywood interconnector); and
- Post contingent FCAS will be sourced within SA following Separation event.
Refer AEMO Network Outage Schedule (NOS) for further details.
AEMO Operations
118318RECLASSIFY CONTINGENCY19/09/2024 12:34:30 PM
Cancellation of a Non-Credible Contingency Event: Farrell-John Butters line and Farrell-Rosebery-Newton-Queenstown line in TAS1 due to Lightning.
AEMO ELECTRICITY MARKET NOTICE
Cancellation of reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits is no longer reasonably possible. There is no longer any lightning activity in the vicinity of the following lines. Accordingly its classification has reverted to a non-credible contingency event.
Region: TAS1
Lines: Farrell-John Butters and Farrell-Rosebery-Newton-Queenstown
Cancellation time: 19/09/2024 12:34
Constraint set(s) revoked:
NONE
Refer AEMO Electricity Market Notice 118317
Auto-generated on behalf of Manager NEM Real Time Operations
Cancellation of reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits is no longer reasonably possible. There is no longer any lightning activity in the vicinity of the following lines. Accordingly its classification has reverted to a non-credible contingency event.
Region: TAS1
Lines: Farrell-John Butters and Farrell-Rosebery-Newton-Queenstown
Cancellation time: 19/09/2024 12:34
Constraint set(s) revoked:
NONE
Refer AEMO Electricity Market Notice 118317
Auto-generated on behalf of Manager NEM Real Time Operations
118317RECLASSIFY CONTINGENCY19/09/2024 11:29:15 AM
Reclassification of a Non-Credible Contingency Event: Farrell-John Butters line and Farrell-Rosebery-Newton-Queenstown line in TAS1 due to Lightning.
AEMO ELECTRICITY MARKET NOTICE
Reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits to now be more likely and reasonably possible. Accordingly AEMO has reclassified it as a credible contingency event.
Region: TAS1
Lines: Farrell-John Butters and Farrell-Rosebery-Newton-Queenstown
Duration: 19/09/2024 11:29 until further notice
Constraint set(s) invoked:
NONE
Auto-generated on behalf of Manager NEM Real Time Operations
Reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits to now be more likely and reasonably possible. Accordingly AEMO has reclassified it as a credible contingency event.
Region: TAS1
Lines: Farrell-John Butters and Farrell-Rosebery-Newton-Queenstown
Duration: 19/09/2024 11:29 until further notice
Constraint set(s) invoked:
NONE
Auto-generated on behalf of Manager NEM Real Time Operations
118314NON-CONFORMANCE18/09/2024 12:50:20 PM
NON-CONFORMANCE Region SA1 Wednesday, 18 September 2024
AEMO ELECTRICITY MARKET NOTICE
NON-CONFORMANCE SA1 Region Wednesday, 18 September 2024
AEMO has declared the following units comprising an Aggregate Dispatch Group as non-conforming under clause 3.8.23 of the National Electricity Rules:
Units: TB2BG1, TB2BL1
Aggregate Dispatch Group: TB2HYB_ADG1
Duration: 18/09/2024 11:20 to 18/09/2024 12:50
Amount: 21 MW
Constraint: NC-S_TB2HYB_ADG1
Auto-generated on behalf of Manager NEM Real Time Operations
NON-CONFORMANCE SA1 Region Wednesday, 18 September 2024
AEMO has declared the following units comprising an Aggregate Dispatch Group as non-conforming under clause 3.8.23 of the National Electricity Rules:
Units: TB2BG1, TB2BL1
Aggregate Dispatch Group: TB2HYB_ADG1
Duration: 18/09/2024 11:20 to 18/09/2024 12:50
Amount: 21 MW
Constraint: NC-S_TB2HYB_ADG1
Auto-generated on behalf of Manager NEM Real Time Operations
118312RECLASSIFY CONTINGENCY18/09/2024 11:51:13 AM
Cancellation: Reclassification of non-credible contingency event due to existence of widespread abnormal condition - NEM region.
AEMO ELECTRICITY MARKET NOTICE.
AEMO considers the occurrence of a non-credible contingency event due to the widespread abnormal conditions advised in AEMO Electricity Market Notice 118311 is no longer reasonably possible and accordingly its classification has reverted to non-credible.
Cancellation time: 1145 hrs 18/09/2024.
No constraints were invoked during this event
Manager NEM Real Time Operations
AEMO considers the occurrence of a non-credible contingency event due to the widespread abnormal conditions advised in AEMO Electricity Market Notice 118311 is no longer reasonably possible and accordingly its classification has reverted to non-credible.
Cancellation time: 1145 hrs 18/09/2024.
No constraints were invoked during this event
Manager NEM Real Time Operations
118311RECLASSIFY CONTINGENCY18/09/2024 01:59:33 AM
Reclassification of non-credible contingency event due to existence of widespread abnormal condition/s - NEM regions
AEMO ELECTRICITY MARKET NOTICE.
AEMO has identified that a non-credible contingency event impacting the power system is more likely to occur and is considered reasonably possible because of the existence of widespread abnormal conditions namely Severe Space Weather Watch in the NEM regions.
AEMO has therefore reclassified the occurrence of a non-credible contingency event involving multiple plant due to these abnormal conditions as credible.
Duration: 0200 hrs 18/09/2024 until further notice
Need for further measures is being monitored and further measures may be implemented in line with the Power System Security Guidelines (SO_OP_3715).
Manager NEM Real Time Operations
AEMO has identified that a non-credible contingency event impacting the power system is more likely to occur and is considered reasonably possible because of the existence of widespread abnormal conditions namely Severe Space Weather Watch in the NEM regions.
AEMO has therefore reclassified the occurrence of a non-credible contingency event involving multiple plant due to these abnormal conditions as credible.
Duration: 0200 hrs 18/09/2024 until further notice
Need for further measures is being monitored and further measures may be implemented in line with the Power System Security Guidelines (SO_OP_3715).
Manager NEM Real Time Operations
118310NON-CONFORMANCE17/09/2024 03:00:15 PM
NON-CONFORMANCE Region SA1 Tuesday, 17 September 2024
AEMO ELECTRICITY MARKET NOTICE
NON-CONFORMANCE SA1 Region Tuesday, 17 September 2024
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MANNSF2
Duration: 17/09/2024 14:10 to 17/09/2024 15:00
Amount: 23 MW
Constraint: NC-S_MANNSF2
Auto-generated on behalf of Manager NEM Real Time Operations
NON-CONFORMANCE SA1 Region Tuesday, 17 September 2024
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MANNSF2
Duration: 17/09/2024 14:10 to 17/09/2024 15:00
Amount: 23 MW
Constraint: NC-S_MANNSF2
Auto-generated on behalf of Manager NEM Real Time Operations
118290RECLASSIFY CONTINGENCY16/09/2024 01:14:54 PM
Cancellation of Reclassification of a Non-Credible Contingency Event - QLD region - 30/04/2019
AEMO ELECTRICITY MARKET NOTICE
Cancellation of Reclassification of a Non-Credible Contingency Event: Nebo SVC and the Nebo No.2 275/132kV transformer - QLD region - 30/04/2019.
Refer AEMO Electricity Market Notice 68251
Based on advice from the participant, AEMO considers the simultaneous trip of the following elements is no longer reasonably possible. Accordingly its classification has reverted to a non-credible contingency event.
Region: QLD
Equipment: Nebo SVC and the Nebo No.2 275/132kV transformer
Cancellation time: 1315 hrs 16/09/2024
Constraint set(s) revoked: Nil
Manager NEM Real Time Operations
Cancellation of Reclassification of a Non-Credible Contingency Event: Nebo SVC and the Nebo No.2 275/132kV transformer - QLD region - 30/04/2019.
Refer AEMO Electricity Market Notice 68251
Based on advice from the participant, AEMO considers the simultaneous trip of the following elements is no longer reasonably possible. Accordingly its classification has reverted to a non-credible contingency event.
Region: QLD
Equipment: Nebo SVC and the Nebo No.2 275/132kV transformer
Cancellation time: 1315 hrs 16/09/2024
Constraint set(s) revoked: Nil
Manager NEM Real Time Operations