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111253POWER SYSTEM EVENTS14/11/2023 11:37:28 AM
Update - Non-credible contingency event - SA region - 14/11/2023
AEMO ELECTRICITY MARKET NOTICE.
Update - Non-credible contingency event - SA region - 14/11/2023
Refer AEMO Electricity Market Notice 111252
At 1124 hrs the Para 275kV West Left Bus was returned to service.
The cause of this non-credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
Update - Non-credible contingency event - SA region - 14/11/2023
Refer AEMO Electricity Market Notice 111252
At 1124 hrs the Para 275kV West Left Bus was returned to service.
The cause of this non-credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
111252POWER SYSTEM EVENTS14/11/2023 11:09:55 AM
Non-credible contingency event - SA region - 14/11/2023
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - SA region - 14/11/2023
At 1045hrs the Para 275kV West Left Bus tripped
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
Non-credible contingency event - SA region - 14/11/2023
At 1045hrs the Para 275kV West Left Bus tripped
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
110690POWER SYSTEM EVENTS03/11/2023 09:19:19 AM
Update - Non-credible contingency event - VIC region - 03/11/2023
AEMO ELECTRICITY MARKET NOTICE.
Update - Non-credible contingency event - VIC region - 03/11/2023
Refer AEMO Electricity Market Notice 110687
At 0845 hrs the Mount Beauty No.2 220kV bus was returned to service.
The cause of this non-credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
Update - Non-credible contingency event - VIC region - 03/11/2023
Refer AEMO Electricity Market Notice 110687
At 0845 hrs the Mount Beauty No.2 220kV bus was returned to service.
The cause of this non-credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
110687POWER SYSTEM EVENTS03/11/2023 04:37:33 AM
Non-credible contingency event - VIC region - 03/11/2023
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - VIC region - 03/11/2023
At 0412 hrs the Mount Beauty No.2 220kV bus tripped.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
Non-credible contingency event - VIC region - 03/11/2023
At 0412 hrs the Mount Beauty No.2 220kV bus tripped.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
110678CONSTRAINTS02/11/2023 12:08:31 PM
Updated Victorian system normal voltage oscillation limit
AEMO ELECTRICITY MARKET NOTICE
AEMO has completed a comprehensive review on voltage oscillation issue in south-west Victoria with consideration of wider asynchronous generators in the area. The voltage oscillation occurs in the south-west region when Heywood interconnector flow is higher than 500 MW from South Australia to Victoria.
The limit will manage the total MW output from Stockyard Hill, Dundonnell and Macarthur wind farms during period when flow on Heywood interconnector higher than 500 MW towards Victoria.
The new constraint equation includes asynchronous generators in south-west Victoria on the left-hand side. This limit is to replace the existing south-west Victoria voltage oscillation limit. Full details on the limits advice are to be published shortly on the AEMO website: https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/congestion-information-resource/limits-advice
The following changes will be implemented at 1000 hrs on Friday 3rd November 2023
? Constraint equation will be removed from constraint set V-NIL:
V_SHWF_FLT_286
? Constraint equation will be implemented and added to constraint set V-NIL:
V_SH_DD_MAC_FLT_965
For full details on the formulation, the new constraint equation has now been loaded into AEMO's pre-production systems.
For further details on this change please contact terry.liu@aemo.com.au
Terry Liu
AEMO Operations
AEMO has completed a comprehensive review on voltage oscillation issue in south-west Victoria with consideration of wider asynchronous generators in the area. The voltage oscillation occurs in the south-west region when Heywood interconnector flow is higher than 500 MW from South Australia to Victoria.
The limit will manage the total MW output from Stockyard Hill, Dundonnell and Macarthur wind farms during period when flow on Heywood interconnector higher than 500 MW towards Victoria.
The new constraint equation includes asynchronous generators in south-west Victoria on the left-hand side. This limit is to replace the existing south-west Victoria voltage oscillation limit. Full details on the limits advice are to be published shortly on the AEMO website: https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/congestion-information-resource/limits-advice
The following changes will be implemented at 1000 hrs on Friday 3rd November 2023
? Constraint equation will be removed from constraint set V-NIL:
V_SHWF_FLT_286
? Constraint equation will be implemented and added to constraint set V-NIL:
V_SH_DD_MAC_FLT_965
For full details on the formulation, the new constraint equation has now been loaded into AEMO's pre-production systems.
For further details on this change please contact terry.liu@aemo.com.au
Terry Liu
AEMO Operations
110677CONSTRAINTS02/11/2023 10:53:49 AM
Update to voltage stability and system strength constraints in North Queensland
AEMO ELECTRICITY MARKET NOTICE
Refer to market notice 102074
AEMO and Powerlink are continuing to investigate system strength requirements in North Queensland.
Due to commissioning of new feeder 8905 (H13 Ross - H39 Woree) 275kV line in Far North Queensland, the system normal equations for system strength and voltage stability have been revised.
A revision to the constraint equations will be implemented at 1400 hrs on Thursday 2nd November 2023.
The new system strength combinations have now published in a limits advice document on AEMO's website. For more information refer to the new limits advice: https://www.aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/congestion-information-resource/limits-advice
This advice contains all the combinations for Queensland for system normal cases.
The constraint equations in the Q-NIL set below will be modified:
? Q_NIL_STRGTH_KBWF
? Q_NIL_STRGTH_KBWF
? Replace Q^NIL_FNQ_MEWF and Q^NIL_FNQ_WRSVC with new equation Q^NIL_FNQ_8905
AEMO Operations
Refer to market notice 102074
AEMO and Powerlink are continuing to investigate system strength requirements in North Queensland.
Due to commissioning of new feeder 8905 (H13 Ross - H39 Woree) 275kV line in Far North Queensland, the system normal equations for system strength and voltage stability have been revised.
A revision to the constraint equations will be implemented at 1400 hrs on Thursday 2nd November 2023.
The new system strength combinations have now published in a limits advice document on AEMO's website. For more information refer to the new limits advice: https://www.aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/congestion-information-resource/limits-advice
This advice contains all the combinations for Queensland for system normal cases.
The constraint equations in the Q-NIL set below will be modified:
? Q_NIL_STRGTH_KBWF
? Q_NIL_STRGTH_KBWF
? Replace Q^NIL_FNQ_MEWF and Q^NIL_FNQ_WRSVC with new equation Q^NIL_FNQ_8905
AEMO Operations
110560RESERVE NOTICE27/10/2023 08:20:02 PM
Cancellation of Actual (LOR2) condition in the SA region - 27/10/2023
AEMO ELECTRICITY MARKET NOTICE
Cancellation of Actual (LOR2) condition in the SA region - 27/10/2023
The Actual LOR2 Condition in the SA Region advised in AEMO Electricity Market Notice No.110559 is cancelled at 2015 hrs 27/10/2023.
Manager NEM Real Time Operations
Cancellation of Actual (LOR2) condition in the SA region - 27/10/2023
The Actual LOR2 Condition in the SA Region advised in AEMO Electricity Market Notice No.110559 is cancelled at 2015 hrs 27/10/2023.
Manager NEM Real Time Operations
110559RESERVE NOTICE27/10/2023 07:49:02 PM
Actual Lack Of Reserve Level 2 (LOR2) in the SA region - 27/10/2023
AEMO ELECTRICITY MARKET NOTICE
Actual Lack Of Reserve Level 2 (LOR2) in the SA region - 27/10/2023
An Actual LOR2 condition has been declared under clause 4.8.4(b) of the National Electricity Rules for the SA region from 1930 hrs.
The Actual LOR2 condition is not forecast in Pre Dispatch
The capacity reserve required is 480 MW
The minimum reserve available is 465 MW
AEMO is seeking an immediate market response.
An insufficient market response may require AEMO to implement a AEMO intervention event.
Manager NEM Real Time Operations
Actual Lack Of Reserve Level 2 (LOR2) in the SA region - 27/10/2023
An Actual LOR2 condition has been declared under clause 4.8.4(b) of the National Electricity Rules for the SA region from 1930 hrs.
The Actual LOR2 condition is not forecast in Pre Dispatch
The capacity reserve required is 480 MW
The minimum reserve available is 465 MW
AEMO is seeking an immediate market response.
An insufficient market response may require AEMO to implement a AEMO intervention event.
Manager NEM Real Time Operations
110349POWER SYSTEM EVENTS21/10/2023 08:40:56 PM
Non-credible contingency event - TAS region - 21/10/2023
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - TAS region - 21/10/2023
At 2029 hrs the Wadamana Tungatina No.1 and No.2 line tripped and auto reclosed.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
Non-credible contingency event - TAS region - 21/10/2023
At 2029 hrs the Wadamana Tungatina No.1 and No.2 line tripped and auto reclosed.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations