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106175CONSTRAINTS01/03/2023 11:54:17 AM
Update to system strength requirements 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 Kaban wind farm in Far North Queensland, the system normal equations have been revised to include following combinations.
-If Stanwell >=2, Stanwell + Calllide >=3, Gladstone >= 1, Stanwell + Callide + Gladstone >= 7, Kareeya >=0, Haughton Syncon status = ON/OFF, North Queensland load >=250 MW,
Ross+FNQ load >=100 MW, limit Kaban Windfarm to 100% (with Haughton Syncon ON), 0% (with Haughton Syncon Syncon OFF) and no limit to other NQLD Plants.
A revision to the constraint equations will be implemented at 1400 hrs on Wednesday 1st March 2023.
The new 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. Additional information has been included in the limit advice to clarify the requirement to disconnect all inverters/turbines under certain system conditions.
The constraint equation in the Q-NIL set of the form below will be modified:
Q_NIL_STRGTH_XXXX
Q_NIL_STRGTH_XXXX_I
AEMO Operations
Refer to market notice 102074
AEMO and Powerlink are continuing to investigate system strength requirements in North Queensland.
Due to commissioning of Kaban wind farm in Far North Queensland, the system normal equations have been revised to include following combinations.
-If Stanwell >=2, Stanwell + Calllide >=3, Gladstone >= 1, Stanwell + Callide + Gladstone >= 7, Kareeya >=0, Haughton Syncon status = ON/OFF, North Queensland load >=250 MW,
Ross+FNQ load >=100 MW, limit Kaban Windfarm to 100% (with Haughton Syncon ON), 0% (with Haughton Syncon Syncon OFF) and no limit to other NQLD Plants.
A revision to the constraint equations will be implemented at 1400 hrs on Wednesday 1st March 2023.
The new 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. Additional information has been included in the limit advice to clarify the requirement to disconnect all inverters/turbines under certain system conditions.
The constraint equation in the Q-NIL set of the form below will be modified:
Q_NIL_STRGTH_XXXX
Q_NIL_STRGTH_XXXX_I
AEMO Operations
105936CONSTRAINTS17/02/2023 05:07:05 PM
Changes to Murraylink Very Fast Runback and constraints in Victoria
AEMO ELECTRICITY MARKET NOTICE
The Murraylink Very Fast Runback (VFRB) scheme is being modified to increase the capacity of the network due to the increase in generation in the area. The scheme will be changed so Murraylink VFRB can be activated / de-activated depending on the time of day on the monitored 220kV lines in north-west Victoria.
The changes to the scheme will be activated and constraint equaiton modified at 1200hrs Monday 20th February 2023. The following system normal constraint equations will be modified:
V^^V_NIL_KGTS
V^^V_NIL_KGTS_2
V>>SML_NIL_7A
V>>SML_NIL_7B
V>>SML_NIL_7C
V>>V_NIL_13
V>>V_NIL_14
V>>V_NIL_20
V>>V_NIL_21
V>>V_NIL_22
V>>V_NIL_23
V>>V_NIL_24
V>>V_NIL_25
V>>V_NIL_26
V>>V_NIL_26_1
V>>V_NIL_26A
V>>V_NIL_26A_1
For full details on the factors on constraint equations and all the constrint equation changes - these have now been loaded into AEMO's pre-production systems.
Ben Blake
AEMO Operations
The Murraylink Very Fast Runback (VFRB) scheme is being modified to increase the capacity of the network due to the increase in generation in the area. The scheme will be changed so Murraylink VFRB can be activated / de-activated depending on the time of day on the monitored 220kV lines in north-west Victoria.
The changes to the scheme will be activated and constraint equaiton modified at 1200hrs Monday 20th February 2023. The following system normal constraint equations will be modified:
V^^V_NIL_KGTS
V^^V_NIL_KGTS_2
V>>SML_NIL_7A
V>>SML_NIL_7B
V>>SML_NIL_7C
V>>V_NIL_13
V>>V_NIL_14
V>>V_NIL_20
V>>V_NIL_21
V>>V_NIL_22
V>>V_NIL_23
V>>V_NIL_24
V>>V_NIL_25
V>>V_NIL_26
V>>V_NIL_26_1
V>>V_NIL_26A
V>>V_NIL_26A_1
For full details on the factors on constraint equations and all the constrint equation changes - these have now been loaded into AEMO's pre-production systems.
Ben Blake
AEMO Operations
102740PROTECTED EVENT30/10/2022 09:03:51 PM
Cancellation: Protected event advice - South Australia region.
AEMO ELECTRICITY MARKET NOTICE.
AEMO has identified that the conditions of the following protected event are no longer met.
Protected event: the loss of multiple transmission elements causing generation disconnection in the South Australia region during periods where destructive wind conditions are forecast by the Bureau of Meteorology.
Cancellation: 2100 hrs 30/10/2022
Constraint set revoked: I-VS_250
Refer AEMO Electricity Market Notice 102723
Manager NEM Real Time Operations
AEMO has identified that the conditions of the following protected event are no longer met.
Protected event: the loss of multiple transmission elements causing generation disconnection in the South Australia region during periods where destructive wind conditions are forecast by the Bureau of Meteorology.
Cancellation: 2100 hrs 30/10/2022
Constraint set revoked: I-VS_250
Refer AEMO Electricity Market Notice 102723
Manager NEM Real Time Operations
102074CONSTRAINTS05/10/2022 01:28:35 PM
Update to system strength requirements in North Queensland
AEMO ELECTRICITY MARKET NOTICE
Refer to market notice 101018
AEMO and Powerlink are continuing to investigate system strength requirements in North Queensland.
Due to commissioning of Kaban wind farm in Far North Queensland, the system normal equations have been revised.
A revision to the constraint equations will be implemented at 1530 hrs on Wednesday 5th October 2022.
The new 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 equation in the Q-NIL set of the form below will be modified:
Q_NIL_STRGTH_XXXX
Q_NIL_STRGTH_XXXX_I
AEMO Operations
Refer to market notice 101018
AEMO and Powerlink are continuing to investigate system strength requirements in North Queensland.
Due to commissioning of Kaban wind farm in Far North Queensland, the system normal equations have been revised.
A revision to the constraint equations will be implemented at 1530 hrs on Wednesday 5th October 2022.
The new 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 equation in the Q-NIL set of the form below will be modified:
Q_NIL_STRGTH_XXXX
Q_NIL_STRGTH_XXXX_I
AEMO Operations
101368CONSTRAINTS26/08/2022 10:59:09 AM
New Victorian system normal voltage stability limit
AEMO ELECTRICITY MARKET NOTICE
AEMO has identified a new voltage collapse issue in south-west Victoria. The voltage collapse occurs in the south-west region for loss of the Haunted Gully to Moorabool 500 kV line with simultaneous trip of both APD potlines as per Market Notice 91405.
The limit will manage flow towards Moorabool on the cut-set of Haunted Gully to Moorabool and Mortlake to Moorabool 500 kV lines.
The new constraint equation includes generators in south-west Victoria on the left-hand side as well as Heywood interconnector. Full details on the limits advice are to be published on 30th August 2022 on the AEMO website: https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/congestion-information-resource/limits-advice
The following constraint equation will be implemented and added to constraint set V-NIL at 1000 hrs on Tuesday 30th August 2022:
V^^V_NIL_SWVIC
For full details on the factors this constraint equation has now been loaded into AEMO's pre-production systems.
For further details on this constraint equation please contact terry.liu@aemo.com.au
Terry Liu
AEMO Operations
AEMO has identified a new voltage collapse issue in south-west Victoria. The voltage collapse occurs in the south-west region for loss of the Haunted Gully to Moorabool 500 kV line with simultaneous trip of both APD potlines as per Market Notice 91405.
The limit will manage flow towards Moorabool on the cut-set of Haunted Gully to Moorabool and Mortlake to Moorabool 500 kV lines.
The new constraint equation includes generators in south-west Victoria on the left-hand side as well as Heywood interconnector. Full details on the limits advice are to be published on 30th August 2022 on the AEMO website: https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/congestion-information-resource/limits-advice
The following constraint equation will be implemented and added to constraint set V-NIL at 1000 hrs on Tuesday 30th August 2022:
V^^V_NIL_SWVIC
For full details on the factors this constraint equation has now been loaded into AEMO's pre-production systems.
For further details on this constraint equation please contact terry.liu@aemo.com.au
Terry Liu
AEMO Operations
101028CONSTRAINTS16/08/2022 11:57:21 AM
Update to Vic to NSW voltage collapse limit
AEMO ELECTRICITY MARKET NOTICE
Refer to Market Notice 82819
AEMO has completed a comprehensive review of the system normal voltage stability limit for loss of all APD potlines for flows from Victoria to New South Wales. The revised limit is the result of latest network configuration, comprehensive generation/load patterns, and recent commissioned generators in Victoria and southern NSW which could potentially mean higher transfers into NSW under some generation/load scenarios.
The revised constraint equation includes generators in southern NSW, north-west Victoria and hydro generation at Mt. Beauty on the left-hand side as well as VIC1-NSW1 and Murraylink. Full details on the limits advice are to be published on 18/08/2022 on the AEMO website: https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/congestion-information-resource/limits-advice
The constraint is most likely to bind when there is low Vic demands and high transfers to NSW. When it binds it will restrict Vic to NSW transfers and southern NSW units.
This revised limit will be implemented to the following constraint equation at 1000 hrs Thursday 18th August 2022.
V^^N_NIL_1
For further details on this constraint equation please contact terry.liu@aemo.com.au
Terry Liu
AEMO Operations
Refer to Market Notice 82819
AEMO has completed a comprehensive review of the system normal voltage stability limit for loss of all APD potlines for flows from Victoria to New South Wales. The revised limit is the result of latest network configuration, comprehensive generation/load patterns, and recent commissioned generators in Victoria and southern NSW which could potentially mean higher transfers into NSW under some generation/load scenarios.
The revised constraint equation includes generators in southern NSW, north-west Victoria and hydro generation at Mt. Beauty on the left-hand side as well as VIC1-NSW1 and Murraylink. Full details on the limits advice are to be published on 18/08/2022 on the AEMO website: https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/congestion-information-resource/limits-advice
The constraint is most likely to bind when there is low Vic demands and high transfers to NSW. When it binds it will restrict Vic to NSW transfers and southern NSW units.
This revised limit will be implemented to the following constraint equation at 1000 hrs Thursday 18th August 2022.
V^^N_NIL_1
For further details on this constraint equation please contact terry.liu@aemo.com.au
Terry Liu
AEMO Operations
101018CONSTRAINTS16/08/2022 09:23:02 AM
Update to System strength requirements in North Queensland
AEMO ELECTRICITY MARKET NOTICE
Refer to market notice 93841
AEMO and Powerlink are continuing to investigate system strength requirements in North Queensland.
Due to reduced numbers of Gladstone units online, the system normal equations have been revised to include below combination.
-If Stanwell >=2, Stanwell + Calllide >=3, Gladstone >= 1, Stanwell + Callide + Gladstone >= 7, Kareeya >=2, Haughton Syncon status = ON, North Queensland load >=250 MW,
Ross+FNQ load >=100 MW, limit Mt Emerald Windfarm to 80% and no limit to other solar farms.
A revision to the constraint equations will be implemented at 1100 hrs on Tuesday 16th August 2022.
The new combinations will be published in a limits advice document on AEMO's website on Wednesday 17th August 2022.
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 of the form below will be modified:
Q_NIL_STRGTH_CLRSF
Q_NIL_STRGTH_COLSF
Q_NIL_STRGTH_DAYSF
Q_NIL_STRGTH_HAMSF
Q_NIL_STRGTH_HAUSF
Q_NIL_STRGTH_HAYSF
Q_NIL_STRGTH_KEP
Q_NIL_STRGTH_KIDSF
Q_NIL_STRGTH_MEWF
Q_NIL_STRGTH_RUGSF
Q_NIL_STRGTH_RRSF
Q_NIL_STRGTH_SMSF
Q_NIL_STRGTH_WHTSF
AEMO Operations
Refer to market notice 93841
AEMO and Powerlink are continuing to investigate system strength requirements in North Queensland.
Due to reduced numbers of Gladstone units online, the system normal equations have been revised to include below combination.
-If Stanwell >=2, Stanwell + Calllide >=3, Gladstone >= 1, Stanwell + Callide + Gladstone >= 7, Kareeya >=2, Haughton Syncon status = ON, North Queensland load >=250 MW,
Ross+FNQ load >=100 MW, limit Mt Emerald Windfarm to 80% and no limit to other solar farms.
A revision to the constraint equations will be implemented at 1100 hrs on Tuesday 16th August 2022.
The new combinations will be published in a limits advice document on AEMO's website on Wednesday 17th August 2022.
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 of the form below will be modified:
Q_NIL_STRGTH_CLRSF
Q_NIL_STRGTH_COLSF
Q_NIL_STRGTH_DAYSF
Q_NIL_STRGTH_HAMSF
Q_NIL_STRGTH_HAUSF
Q_NIL_STRGTH_HAYSF
Q_NIL_STRGTH_KEP
Q_NIL_STRGTH_KIDSF
Q_NIL_STRGTH_MEWF
Q_NIL_STRGTH_RUGSF
Q_NIL_STRGTH_RRSF
Q_NIL_STRGTH_SMSF
Q_NIL_STRGTH_WHTSF
AEMO Operations
99413CONSTRAINTS24/06/2022 01:18:44 PM
Update to SA to Victoria limits for Para SVC outage
AEMO ELECTRICITY MARKET NOTICE
AEMO has been working with ElectraNet on a review of the oscillatory stability limits for the Para SVC outage for flows from South Australia to Victoria.
From that review the these limits from SA to Vic have been increased by 50 MW. The limit on Heywood has changed to 470 MW and for Heywood + Murraylink to 620 MW when the oscillatory stability monitoring is in service. If oscillatory monitoring is not in service the 50 MW increase will not apply.
The revised constraints were implemented in the constraint set S-PA_VC1 at 1300 hrs Friday 24th June 2022:
S:VS_PASVC_570OSC_AT
S:VS_PA_SVC_620
S:V_PASVC_420OSC_AT
S:V_PA_SVC_470
SV_470_DYN
AEMO and ElectraNet are continuing their studies on the limits for the Para SVC outage to determine if further increases can be made.
For further details on this this change please contact ben.blake@aemo.com.au
Ben Blake
AEMO Operations
AEMO has been working with ElectraNet on a review of the oscillatory stability limits for the Para SVC outage for flows from South Australia to Victoria.
From that review the these limits from SA to Vic have been increased by 50 MW. The limit on Heywood has changed to 470 MW and for Heywood + Murraylink to 620 MW when the oscillatory stability monitoring is in service. If oscillatory monitoring is not in service the 50 MW increase will not apply.
The revised constraints were implemented in the constraint set S-PA_VC1 at 1300 hrs Friday 24th June 2022:
S:VS_PASVC_570OSC_AT
S:VS_PA_SVC_620
S:V_PASVC_420OSC_AT
S:V_PA_SVC_470
SV_470_DYN
AEMO and ElectraNet are continuing their studies on the limits for the Para SVC outage to determine if further increases can be made.
For further details on this this change please contact ben.blake@aemo.com.au
Ben Blake
AEMO Operations
96779PROTECTED EVENT05/06/2022 05:33:03 AM
Cancellation: Protected event advice - South Australia region.
AEMO ELECTRICITY MARKET NOTICE.
AEMO has identified that the conditions of the following protected event are no longer met.
Protected event: the loss of multiple transmission elements causing generation disconnection in the South Australia region during periods where destructive wind conditions are forecast by the Bureau of Meteorology.
Cancellation: 0530 hrs 05/06/2022
Constraint set revoked: I-VS_250
Refer AEMO Electricity Market Notice 96776
Manager NEM Real Time Operations
AEMO has identified that the conditions of the following protected event are no longer met.
Protected event: the loss of multiple transmission elements causing generation disconnection in the South Australia region during periods where destructive wind conditions are forecast by the Bureau of Meteorology.
Cancellation: 0530 hrs 05/06/2022
Constraint set revoked: I-VS_250
Refer AEMO Electricity Market Notice 96776
Manager NEM Real Time Operations