Market Notices

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 ten additional generator combinations which meet minimum system strength requirements in South Australia.

The new combinations:
LOW_18B - 1 x Torrens Island A units + 3 x Torrens Island B units + either Quarantine 5 or Dry Creek 1-3
LOW_23A - 2 x Torrens Island A units + 1 x Torrens Island B units + Osborne GT & ST + Mintaro
LOW_23B - 1 x Torrens Island A units + 2 x Torrens Island B units + Osborne GT & ST + Mintaro
LOW_24 - 2 x Torrens Island A units + 1 x Torrens Island B units + either Quarantine 5 or Dry Creek 1-3 + Mintaro
LOW_25 - 2 x Torrens Island B units + Quarantine 5 + Dry Creek 1-3 + Mintaro
LOW_26 - 1 x Torrens Island A units + 1 x Torrens Island B units + Osborne GT & ST + either Quarantine 5 or Dry Creek 1-3 + Mintaro
LOW_27 - 1 x Torrens Island A units + 2 x Torrens Island B units + either Quarantine 5 or Dry Creek 1-3 + Mintaro
LOW_28 - 1 x Torrens Island A units + 3 x Torrens Island B units + Mintaro
LOW_29 - 3 x Torrens Island B units + Osborne GT & ST + Mintaro
LOW_30 - 2 x Torrens Island A units + Osborne GT & ST + either Quarantine 5 or Dry Creek 1-3 + Mintaro

The following combinations have been relabelled:
LOW_18 is now LOW_18A
LOW_17A is now LOW_17
LOW_20A is now LOW_20

For more information refer to the updated limits advice:
https://www.aemo.com.au/-/media/Files/Electricity/NEM/Security_and_Reliability/Congestion-Information/2018/Transfer-Limit-Advice---South-Australian-System-Strength.pdf

A further update to this advice is planned before the end of June 2018.

Ben Blake
AEMO Operations

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 two additional generator combination which meet minimum system strength requirements in South Australia.

The new combinations are:
LOW_17B - 3 x Torrens Island B units + Osborne GT & ST + either Quarantine 5 or Dry Creek 1-3
LOW_20B - 1 x Torrens Island A units + 2 x Torrens Island B units + Osborne GT & ST + either Quarantine 5 or Dry Creek 1-3

The following combinations have been relabelled:
LOW_17 (3 x Torrens Island A units + Osborne GT & ST + either Quarantine 5 or Dry Creek 1-3) is now LOW_17A
LOW_20 (2 x Torrens Island A units + 1 x Torrens Island B units + Osborne GT & ST + either Quarantine 5 or Dry Creek 1-3) is now LOW_20A
LOW_22 (1 x Torrens Island B unit + Osborne GT & ST + Quarantine 5 + Dry Creek 1-3) is now LOW_22B
LOW_23 (1 x Torrens Island A unit + Osborne GT & ST + Quarantine 5 + Dry Creek 1-3) is now LOW_22A

For more information refer to the updated limits advice:
https://www.aemo.com.au/-/media/Files/Electricity/NEM/Security_and_Reliability/Congestion-Information/2018/Transfer-Limit-Advice---South-Australian-System-Strength.pdf

A further update to this advice is planned before the end of May 2018.

Ben Blake
AEMO Operations

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 five additional generator combinations which meet minimum system strength requirements in South Australia.

The new combinations are:

LOW_19 - 1 x Torrens Island A unit + 2 x Torrens Island B units + Quarantine 5 + Dry Creek 1-3

LOW_20 - 2 x Torrens Island A units + 1 x Torrens Island B unit + Osborne GT & ST + either Quarantine 5 or Dry Creek 1-3

LOW_21 - 2 x Torrens Island A units + 2 x Torrens Island B units + either Quarantine 5 or Dry Creek 1-3

LOW_22 - 1 x Torrens Island B unit + Osborne GT & ST + Quarantine 5 + Dry Creek 1-3

LOW_23 - 1 x Torrens Island A unit + Osborne GT & ST + Quarantine 5 + Dry Creek 1-3

For more information refer to the updated limits advice:

http://www.aemo.com.au/-/media/Files/Electricity/NEM/Security_and_Reliability/Congestion-Information/2018/Transfer-Limit-Advice---South-Australian-System-Strength.pdf

Manager NEM Real Time Operations

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 two additional generator combinations which meet minimum system strength requirements in South Australia.

The new combinations are:

LOW_17 - 3 x Torrens Island A units + Osborne GT & ST + either Quarantine 5 or Dry Creek 1-3

LOW_18 - 3 x Torrens Island A units + 1 x Torrens Island B unit + either Quarantine 5 or Dry Creek 1-3

For more information refer to the updated limits advice:

http://www.aemo.com.au/-/media/Files/Electricity/NEM/Security_and_Reliability/Congestion-Information/2018/Transfer-Limit-Advice---South-Australian-System-Strength-(1).pdf

Sujeewa Rajapakse
AEMO Operations

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 one additional generator combination which meet minimum system strength requirements in South Australia.

This new combination is:
LOW_5B - 2 x Torrens Island A units + 3 x Torrens Island B units

Note: LOW_5 (3 x Torrens Island A units + 2 x Torrens Island B units) has been relabelled as LOW_5A

For more information refer to the updated limits advice:
https://www.aemo.com.au/-/media/Files/Electricity/NEM/Security_and_Reliability/Congestion-Information/2018/Transfer-Limit-Advice---South-Australian-System-Strength.pdf

A further update to this advice is planned by early May 2018.

Ben Blake
AEMO Operations

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

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

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

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