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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
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
110341POWER SYSTEM EVENTS21/10/2023 03:40:53 AM
Update - Non-credible contingency event - QLD region - 21/10/2023
AEMO ELECTRICITY MARKET NOTICE.
Update - Non-credible contingency event - QLD region - 21/10/2023
Refer AEMO Electricity Market Notice 110340
At 0208 hrs the Ross No 2 275kV 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 - QLD region - 21/10/2023
Refer AEMO Electricity Market Notice 110340
At 0208 hrs the Ross No 2 275kV 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
110340POWER SYSTEM EVENTS21/10/2023 02:56:51 AM
Update Non-credible contingency event - QLD region - 21/10/2023
AEMO ELECTRICITY MARKET NOTICE.
Update Non-credible contingency event - QLD region - 21/10/2023
Refer to market notice 110339.
At 0133 hrs the Ross No 2 275kV Bus tripped.
AEMO did not instruct load shedding.
AEMO has been advised of disconnection of 218 MW bulk electrical load.
The 132kV network between Clare South and Tully has been disconnected
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
Update Non-credible contingency event - QLD region - 21/10/2023
Refer to market notice 110339.
At 0133 hrs the Ross No 2 275kV Bus tripped.
AEMO did not instruct load shedding.
AEMO has been advised of disconnection of 218 MW bulk electrical load.
The 132kV network between Clare South and Tully has been disconnected
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
110339POWER SYSTEM EVENTS21/10/2023 02:18:43 AM
Non-credible contingency event - QLD region - 21/10/2023
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - QLD region - 21/10/2023
At 0133 hrs the Ross No 2 275kV 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 - QLD region - 21/10/2023
At 0133 hrs the Ross No 2 275kV 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
110331POWER SYSTEM EVENTS19/10/2023 02:47:35 PM
Non-credible contingency event - VIC region - 19/10/2023
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - VIC region - 19/10/2023
At 1437 hrs the Moorabool No.2 500kV 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 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
Non-credible contingency event - VIC region - 19/10/2023
At 1437 hrs the Moorabool No.2 500kV 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 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
110291POWER SYSTEM EVENTS17/10/2023 09:20:16 AM
Update - Non-credible contingency event - SA region - 17/10/2023
AEMO ELECTRICITY MARKET NOTICE.
Update - Non-credible contingency event - SA region - 17/10/2023
Refer AEMO Electricity Market Notice 110289
At 0845 hrs the Penola_W Kincraig 132kV line 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 - 17/10/2023
Refer AEMO Electricity Market Notice 110289
At 0845 hrs the Penola_W Kincraig 132kV line 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
110289POWER SYSTEM EVENTS17/10/2023 08:25:17 AM
Non-credible contingency event - SA region - 17/10/2023
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - SA region - 17/10/2023
At 0711 hrs the Penola_W Kincraig 132kV line offloaded at one end only, during switching for planned outage of Kincraig No.1 132/33/11kV transformer.
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 - 17/10/2023
At 0711 hrs the Penola_W Kincraig 132kV line offloaded at one end only, during switching for planned outage of Kincraig No.1 132/33/11kV transformer.
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