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61662CONSTRAINTS06/03/2018 04:12:38 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_14 - 2 x Torrens Island A units + 1 x Torrens Island B units + 1 x Pelican Point GT/ST units
LOW_15 - 1 x Torrens Island A units + 1 x Torrens Island B units + 1 x Pelican Point GT/ST units + Quarantine 5 / 3 x Dry Creek units
LOW_16 - 3 x Torrens Island A units + 1 x Pelican Point GT/ST units + Osborne GT/ST
Note: LOW_14 replaces LOW_12.
For more information refer to the updated limits advice:
https://www.aemo.com.au/-/media/Files/Electricity/NEM/Security_and_Reliability/Congestion-Information/2017/Transfer-Limit-Advice---South-Australian-System-Strength.pdf
A further update to this advice is planned by late April/May 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_14 - 2 x Torrens Island A units + 1 x Torrens Island B units + 1 x Pelican Point GT/ST units
LOW_15 - 1 x Torrens Island A units + 1 x Torrens Island B units + 1 x Pelican Point GT/ST units + Quarantine 5 / 3 x Dry Creek units
LOW_16 - 3 x Torrens Island A units + 1 x Pelican Point GT/ST units + Osborne GT/ST
Note: LOW_14 replaces LOW_12.
For more information refer to the updated limits advice:
https://www.aemo.com.au/-/media/Files/Electricity/NEM/Security_and_Reliability/Congestion-Information/2017/Transfer-Limit-Advice---South-Australian-System-Strength.pdf
A further update to this advice is planned by late April/May 2018.
Ben Blake
AEMO Operations
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
57400RESERVE NOTICE10/02/2017 06:26:34 PM
Cancellation - Actual Lack Of Reserve Level 3 (LOR3) in the NSW Region- 10-02-2017
AEMO ELECTRICITY MARKET NOTICE
Cancellation - Actual Lack Of Reserve Level 3 (LOR3) in the NSW Region- 10-02-2017
Refer Electricity Market Notice 57396
Customer load is no longer being interrupted in NSW Region.
The Actual LOR3 condition has been cancelled for the NSW region from 1805 hrs.
Manager NEM Real Time Operations
Cancellation - Actual Lack Of Reserve Level 3 (LOR3) in the NSW Region- 10-02-2017
Refer Electricity Market Notice 57396
Customer load is no longer being interrupted in NSW Region.
The Actual LOR3 condition has been cancelled for the NSW region from 1805 hrs.
Manager NEM Real Time Operations
57396RESERVE NOTICE10/02/2017 05:20:49 PM
Actual Lack Of Reserve Level 3 (LOR3) in the NSW Region- 10-02-2017
AEMO ELECTRICITY MARKET NOTICE
Actual Lack Of Reserve Level 3 (LOR3) in the NSW Region- 10-02-2017
Under the NER Cl 4.8.4(d), AEMO considers that Customer load is actually being interrupted in order to maintain or restore the security of the power system in NSW Region.
An Actual LOR3 condition has been declared for the NSW region from 1650 hrs.
The Actual LOR3 condition is forecast to exist until 1800 hrs
The maximum load to be interrupted is 310 MW at 1706 hrs 10/02/2017
Manager NEM Real Time Operations
Actual Lack Of Reserve Level 3 (LOR3) in the NSW Region- 10-02-2017
Under the NER Cl 4.8.4(d), AEMO considers that Customer load is actually being interrupted in order to maintain or restore the security of the power system in NSW Region.
An Actual LOR3 condition has been declared for the NSW region from 1650 hrs.
The Actual LOR3 condition is forecast to exist until 1800 hrs
The maximum load to be interrupted is 310 MW at 1706 hrs 10/02/2017
Manager NEM Real Time Operations
57284RESERVE NOTICE08/02/2017 07:08:16 PM
Cancellation of the Actual (LOR3) condition in the South Australia region - Wednesday, 8 February 2017
AEMO ELECTRICITY MARKET NOTICE
Cancellation of the Actual (LOR3) condition in the South Australia region - Wednesday, 8 February 2017
Refer AEMO Electricity Market Notice 57282
The Actual LOR3 condition in the South Australia Region Market Notice is cancelled at 1900 hrs Wednesday, 8 February 2017.
Manager NEM Real Time Operations
Cancellation of the Actual (LOR3) condition in the South Australia region - Wednesday, 8 February 2017
Refer AEMO Electricity Market Notice 57282
The Actual LOR3 condition in the South Australia Region Market Notice is cancelled at 1900 hrs Wednesday, 8 February 2017.
Manager NEM Real Time Operations
57282RESERVE NOTICE08/02/2017 06:11:12 PM
Actual Lack Of Reserve Level 3 (LOR3) in the South Australia Region - Wednesday, 8 February 2017.
AEMO ELECTRICITY MARKET NOTICE
Actual Lack Of Reserve Level 3 (LOR3) in the South Australia Region - Wednesday, 8 February 2017.
Under the NER Cl 4.8.4(d), AEMO considers that Customer load is actually being interrupted in order to maintain or restore the security of the power system in South Australia Region.
An Actual LOR3 condition has been declared for the South Australia region from 1803 hrs.
The Actual LOR3 condition is forecast to exist until 1930 hrs
The maximum load is being interrupted is 100 MW at 1803 hrs Wednesday, 8 February 2017
Manager NEM Real Time Operations
Actual Lack Of Reserve Level 3 (LOR3) in the South Australia Region - Wednesday, 8 February 2017.
Under the NER Cl 4.8.4(d), AEMO considers that Customer load is actually being interrupted in order to maintain or restore the security of the power system in South Australia Region.
An Actual LOR3 condition has been declared for the South Australia region from 1803 hrs.
The Actual LOR3 condition is forecast to exist until 1930 hrs
The maximum load is being interrupted is 100 MW at 1803 hrs Wednesday, 8 February 2017
Manager NEM Real Time 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
54609CONSTRAINTS25/07/2016 01:18:19 PM
Updates to Victorian system normal stability constraint equations
AEMO ELECTRICITY MARKET NOTICE
The Victorian system normal constraint equations that determine Victorian export limits based on transient stability and voltage stability at Heywood for Victoria to South Australia flows will be updated to a revised formulation on 25 July 2016 after 1330 hrs. This revised formulation models the effects of higher flows on Victoria to SA on Heywood and the new series capacitors at Black Range.
The changes are to the following constraint equations :
V::N_NIL_V1
V::N_NIL_V2
V::N_NIL_Q1
V::N_NIL_Q2
V::N_NIL_S1
V::N_NIL_S2
V::N_NIL_SD
V^S_HYCP
Ben Blake
AEMO Operations
The Victorian system normal constraint equations that determine Victorian export limits based on transient stability and voltage stability at Heywood for Victoria to South Australia flows will be updated to a revised formulation on 25 July 2016 after 1330 hrs. This revised formulation models the effects of higher flows on Victoria to SA on Heywood and the new series capacitors at Black Range.
The changes are to the following constraint equations :
V::N_NIL_V1
V::N_NIL_V2
V::N_NIL_Q1
V::N_NIL_Q2
V::N_NIL_S1
V::N_NIL_S2
V::N_NIL_SD
V^S_HYCP
Ben Blake
AEMO Operations