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60252CONSTRAINTS08/12/2017 12:18:10 PM
Updated generator combinations for SA system strength
AEMO MARKET NOTICE
Updated generator combinations for SA system strength
AEMO is continuing to investigate system strength requirements in South Australia.
Through this work, AEMO has identified three additional generator combinations which meet minimum system strength requirements in South Australia.
These new combinations are:
LOW_11 - 1 x Torrens Island A units + all Pelican Point units
LOW_12 - 3 x Torrens Island A units + 1 x Torrens Island B units + 1 x Pelican Point GT/ST units
LOW_13 - 1 x Torrens Island A units + 3 x Torrens Island B units + Osborne GT/ST
The limit on non-synchronous generation in South Australia when only a minimum strength requirement is met has also now been increased from 1200 to 1295 MW for the new and existing combinations. The limit for higher levels of synchronous generation has also been increased from 1700 to 1870 - Heywood (Vic to SA) transfers.
For more information refer to the updated limits advice:
http://www.aemo.com.au/-/media/Files/Electricity/NEM/Security_and_Reliability/Congestion-Information/2017/Transfer-Limit-Advice---South-Australian-System-Strength.pdf
The advice also includes a guide as to which generator combinations are required to satisfy N-1 operational conditions.
The ID of the constraint equation which manages this limit has now changed from S_WIND_1200_AUTO to S_NIL_STRENGTH_1 and S_NIL_STRENGTH_2.
AEMO are continuing to investigate system strength requirements in South Australia. A further update to this advice is expected by late January 2018.
Ben Blake
AEMO Operations
Updated generator combinations for SA system strength
AEMO is continuing to investigate system strength requirements in South Australia.
Through this work, AEMO has identified three additional generator combinations which meet minimum system strength requirements in South Australia.
These new combinations are:
LOW_11 - 1 x Torrens Island A units + all Pelican Point units
LOW_12 - 3 x Torrens Island A units + 1 x Torrens Island B units + 1 x Pelican Point GT/ST units
LOW_13 - 1 x Torrens Island A units + 3 x Torrens Island B units + Osborne GT/ST
The limit on non-synchronous generation in South Australia when only a minimum strength requirement is met has also now been increased from 1200 to 1295 MW for the new and existing combinations. The limit for higher levels of synchronous generation has also been increased from 1700 to 1870 - Heywood (Vic to SA) transfers.
For more information refer to the updated limits advice:
http://www.aemo.com.au/-/media/Files/Electricity/NEM/Security_and_Reliability/Congestion-Information/2017/Transfer-Limit-Advice---South-Australian-System-Strength.pdf
The advice also includes a guide as to which generator combinations are required to satisfy N-1 operational conditions.
The ID of the constraint equation which manages this limit has now changed from S_WIND_1200_AUTO to S_NIL_STRENGTH_1 and S_NIL_STRENGTH_2.
AEMO are continuing to investigate system strength requirements in South Australia. A further update to this advice is expected by late January 2018.
Ben Blake
AEMO Operations
58845CONSTRAINTS19/07/2017 05:03:02 PM
Constraint invoked to manage power system security in SA region
AEMO ELECTRICITY MARKET NOTICE
Refer to market notices 58785
Constraint Invocation to manage power system security in SA Region
In order to maintain sufficient fault levels in SA and hence a secure operating state, the following constraint set was invoked at 1500hrs which operates in both Dispatch and Pre-Dispatch:
S_WIND_1200_AUTO
This constraint equation automates the process of applying the 1200 MW limit on the wind farms. If there is enough synchronous generation online it will be "swamped" out by adding 10000 to the right-hand side, otherwise the 1200 MW limit will be applied.
Ben Blake
AEMO Operations
Refer to market notices 58785
Constraint Invocation to manage power system security in SA Region
In order to maintain sufficient fault levels in SA and hence a secure operating state, the following constraint set was invoked at 1500hrs which operates in both Dispatch and Pre-Dispatch:
S_WIND_1200_AUTO
This constraint equation automates the process of applying the 1200 MW limit on the wind farms. If there is enough synchronous generation online it will be "swamped" out by adding 10000 to the right-hand side, otherwise the 1200 MW limit will be applied.
Ben Blake
AEMO Operations
55470CONSTRAINTS25/10/2016 04:11:14 PM
Change to FCAS Regulation constraint equations for managing time error
AEMO ELECTRICITY MARKET NOTICE
Change to FCAS Regulation constraint equations for managing time error
AEMO is changing the way the FCAS constraint equations work for automatically increasing the regulation when the time error exceeds 1.5s in the Mainland. Currently the regulation is required from all NEM regions when there is a Mainland (NSW, Qld, SA and Victoria) time error.
The change to be made is to set the FCAS regulation requirements for Mainland regions only when there is a Mainland time error exceedance.
The FCAS requirements from all NEM regions of 120 MW lower regulation and 130 MW raise regulation has not changed.
The calculation for the regulation is detailed in SO_OP3715, section 19.
This change will take effect at 1700 hrs on 25 October 2016.
Ben Blake
AEMO Operations
Change to FCAS Regulation constraint equations for managing time error
AEMO is changing the way the FCAS constraint equations work for automatically increasing the regulation when the time error exceeds 1.5s in the Mainland. Currently the regulation is required from all NEM regions when there is a Mainland (NSW, Qld, SA and Victoria) time error.
The change to be made is to set the FCAS regulation requirements for Mainland regions only when there is a Mainland time error exceedance.
The FCAS requirements from all NEM regions of 120 MW lower regulation and 130 MW raise regulation has not changed.
The calculation for the regulation is detailed in SO_OP3715, section 19.
This change will take effect at 1700 hrs on 25 October 2016.
Ben Blake
AEMO Operations
55352MARKET SUSPENSION12/10/2016 11:23:59 AM
Review of spot prices in other NEM regions that have had actual flows towards South Australia
For the duration of the market suspension in South Australia, AEMO has reviewed prices in other regions as required by the National Electricity Rules.
Spot prices in other NEM regions that have had actual flow towards South Australia must be capped in accordance with clause 3.14.5(m).
AEMO has completed the review for suspended periods on 11/10/2016 and outlined the results at AEMO's website: http://www.aemo.com.au/Media-Centre/Prices-in-South-Australia
These prices will be updated in the Market and Settlement Systems as soon as practicable.
Manager Market Monitoring and Change
Spot prices in other NEM regions that have had actual flow towards South Australia must be capped in accordance with clause 3.14.5(m).
AEMO has completed the review for suspended periods on 11/10/2016 and outlined the results at AEMO's website: http://www.aemo.com.au/Media-Centre/Prices-in-South-Australia
These prices will be updated in the Market and Settlement Systems as soon as practicable.
Manager Market Monitoring and Change
55349MARKET SUSPENSION11/10/2016 10:36:54 PM
Resumption of Spot Market - South Australia Region - Tuesday, 11 October 2016
AEMO ELECTRICITY MARKET NOTICE
Resumption of Spot Market - South Australia Region - Tuesday, 11 October 2016
Update to Market Notice 55343
AEMO confirms that the Spot Market in the South Australia region resumed operation from 2230 hrs on Tuesday, 11 October 2016.
The following Constraint sets have been revoked at 2230 hrs 11/10/16
Constraint set I-SVML_000
Constraint set I-SV_000
Constraint set I-SV_000_DYN
Constraint set F-ESTN_ISLE
Manager NEM Real Time Operations
Resumption of Spot Market - South Australia Region - Tuesday, 11 October 2016
Update to Market Notice 55343
AEMO confirms that the Spot Market in the South Australia region resumed operation from 2230 hrs on Tuesday, 11 October 2016.
The following Constraint sets have been revoked at 2230 hrs 11/10/16
Constraint set I-SVML_000
Constraint set I-SV_000
Constraint set I-SV_000_DYN
Constraint set F-ESTN_ISLE
Manager NEM Real Time Operations
55343MARKET SUSPENSION11/10/2016 06:26:32 PM
Resumption of Spot Market - South Australia region - 11 October 2016
AEMO ELECTRICITY MARKET NOTICE
Resumption of Spot Market - South Australia - 11 October 2016
Update to Market Notice 55249
AEMO has been notified that the Ministerial direction issued on 29 September 2016 under the Essential Services Act 1981 (SA) to suspend the market in the South Australia region has been revoked.
AEMO is satisfied that there is no other reason to continue the suspension, and declares that the spot market operation in the South Australia region is to resume in accordance with chapter 3 of the National Electricity Rules at 2230 hrs on 11/10/16.
Manager NEM Real Time Operations
Resumption of Spot Market - South Australia - 11 October 2016
Update to Market Notice 55249
AEMO has been notified that the Ministerial direction issued on 29 September 2016 under the Essential Services Act 1981 (SA) to suspend the market in the South Australia region has been revoked.
AEMO is satisfied that there is no other reason to continue the suspension, and declares that the spot market operation in the South Australia region is to resume in accordance with chapter 3 of the National Electricity Rules at 2230 hrs on 11/10/16.
Manager NEM Real Time Operations
55332MARKET SUSPENSION11/10/2016 09:55:28 AM
Review of spot prices in other NEM regions that have had actual flows towards South Australia
For the duration of the current market suspension in South Australia, AEMO continues to review prices in other regions as required by the National Electricity Rules.
Spot prices in other NEM regions that have had actual flow towards South Australia must be capped in accordance with clause 3.14.5(m).
AEMO has completed the review for suspended periods on 10/10/2016 and outlined the results below:
Dispatch Interval Region Original RRP Revised RRP
10/10/2016 05:15 VIC1 30.63418 28.80401
10/10/2016 05:50 VIC1 35.43131 29.24736
10/10/2016 06:00 VIC1 48.27542 29.33514
These prices will be updated in the Market and Settlement Systems as soon as practicable.
Manager Market Monitoring and Change
Spot prices in other NEM regions that have had actual flow towards South Australia must be capped in accordance with clause 3.14.5(m).
AEMO has completed the review for suspended periods on 10/10/2016 and outlined the results below:
Dispatch Interval Region Original RRP Revised RRP
10/10/2016 05:15 VIC1 30.63418 28.80401
10/10/2016 05:50 VIC1 35.43131 29.24736
10/10/2016 06:00 VIC1 48.27542 29.33514
These prices will be updated in the Market and Settlement Systems as soon as practicable.
Manager Market Monitoring and Change
55320MARKET SUSPENSION10/10/2016 01:18:39 PM
Review of spot prices in other NEM regions that have had actual flows towrds South Australia
For the duration of the current market suspension in South Australia, AEMO continues to review prices in other regions as required by the National Electricity Rules.
Spot prices in other NEM regions that have had actual flow towards South Australia must be capped in accordance with clause 3.14.5(m).
AEMO has completed the review for suspended periods on 09/10/2016 and determined that no price revision is required in the other regions.
Manager Market Monitoring and Change
Spot prices in other NEM regions that have had actual flow towards South Australia must be capped in accordance with clause 3.14.5(m).
AEMO has completed the review for suspended periods on 09/10/2016 and determined that no price revision is required in the other regions.
Manager Market Monitoring and Change
55289MARKET SUSPENSION09/10/2016 03:44:03 PM
Review of spot prices in other NEM regions that have had actual flows towards South Australia
For the duration of the current market suspension in South Australia, AEMO continues to review prices in other regions as required by the National Electricity Rules.
Spot prices in other NEM regions that have had actual flow towards South Australia must be capped in accordance with clause 3.14.5(m).
AEMO has completed the review for suspended periods on 07/10/2016 and 08/10/2016, and outlined the results at AEMO's website: http://www.aemo.com.au/Media-Centre/Prices-in-South-Australia
These prices will be updated in the Market and Settlement Systems as soon as practicable.
Manager Market Monitoring and Change
Spot prices in other NEM regions that have had actual flow towards South Australia must be capped in accordance with clause 3.14.5(m).
AEMO has completed the review for suspended periods on 07/10/2016 and 08/10/2016, and outlined the results at AEMO's website: http://www.aemo.com.au/Media-Centre/Prices-in-South-Australia
These prices will be updated in the Market and Settlement Systems as soon as practicable.
Manager Market Monitoring and Change