Market Notices

75226CONSTRAINTS06/04/2020 09:50:11 AM

Update to system strength requirements in North Queensland

AEMO ELECTRICITY MARKET NOTICE

Refer to market notice 74987

AEMO and Powerlink are continuing to investigate system strength requirements in North Queensland. A revision to the requirements will be implemented at 1300 hrs today.

The revised minimum generator combinations and limits are:
1 - 3 x Stanwell, 1 x Callide B, 1 x Callide C, 3 x Gladstone, 10 x Total Stanwell+Callide+Gladstone, 4 x Kareeya, 2 x Barron Gorge: 100% output
2 - 3 x Stanwell, 1 x Callide B, 1 x Callide C, 3 x Gladstone, 10 x Total Stanwell+Callide+Gladstone, 4 x Kareeya, 1 x Barron Gorge: 80% output
3 - 3 x Stanwell, 1 x Callide B, 1 x Callide C, 3 x Gladstone, 10 x Total Stanwell+Callide+Gladstone, 2 x Kareeya, 1 x Townsville GT: 80% output
4 - 3 x Stanwell, 1 x Callide B, 1 x Callide C, 3 x Gladstone, 10 x Total Stanwell+Callide+Gladstone, 2 x Kareeya, 1 x Barron Gorge: 70% output
5 - 3 x Stanwell, 1 x Callide B, 1 x Callide C, 3 x Gladstone, 10 x Total Stanwell+Callide+Gladstone, 4 x Kareeya: 70% output

The following new combination will also be implemented:
4H - 3 x Stanwell, 1 x Callide B, 1 x Callide C, 3 x Gladstone, 10 x Total Stanwell+Callide+Gladstone, 2 x Kareeya, 1 x Barron Gorge, 50% or less output at Mt Emerald: 100% output for Haughton solar farm. This new limit takes into account the current physical limitation on generation from Sun Metals Solar Farm.

If these combinations are not met all three generators have a limit of 0 MW and 0 inverters.

The constraint equations are: Q_NIL_STRGTH_MEWF, Q_NIL_STRGTH_HAUSF, Q_NIL_STRGTH_SMSF.

For further details please contact James Lindley at james.lindley@aemo.com.au or Simon Taylor at businessdevelopment@powerlink.com.au

Ben Blake
AEMO Operations
74987CONSTRAINTS19/03/2020 01:03:38 PM

Revised System Strength limits in North Queensland

AEMO ELECTRICITY MARKET NOTICE

AEMO and Powerlink are continuing to investigate system strength requirements in North Queensland.

Through this work, AEMO and Powerlink have identified the need, depending on power system conditions, to constrain the output of three generators in North Queensland to maintain power system security.

The constraint equation is expected to limit generation from the three generators depending on power system conditions. The generators are Mt Emerald Wind Farm, Haughton Solar Farm and Sun Metals Solar Farm.

The constraint equations are: Q_NIL_STRGTH_MEWF, Q_NIL_STRGTH_HAUSF, Q_NIL_STRGTH_SMSF. These will be implemented at 1500hrs EST today.

The minimum generator combinations and limits are:
1 - 3 x Stanwell, 1 x Callide B, 1 x Callide C, 4 x Gladstone, 10 x Total Stanwell+Callide+Gladstone, 4 x Kareeya, 2 x Barron Gorge: 100% output
2 - 3 x Stanwell, 1 x Callide B, 1 x Callide C, 4 x Gladstone, 10 x Total Stanwell+Callide+Gladstone, 4 x Kareeya, 1 x Barron Gorge: 80% output
3 - 3 x Stanwell, 1 x Callide B, 1 x Callide C, 4 x Gladstone, 10 x Total Stanwell+Callide+Gladstone, 2 x Kareeya, 1 x Townsville GT: 80% output
4 - 3 x Stanwell, 1 x Callide B, 1 x Callide C, 4 x Gladstone, 10 x Total Stanwell+Callide+Gladstone, 2 x Kareeya, 1 x Barron Gorge: 70% output
5 - 3 x Stanwell, 1 x Callide B, 1 x Callide C, 4 x Gladstone, 10 x Total Stanwell+Callide+Gladstone, 4 x Kareeya: 70% output

If these combinations are not met all three generators have a limit of 0 MW and 0 inverters.

For further details please contact James Lindley at james.lindley@aemo.com.au or Simon Taylor at businessdevelopment@powerlink.com.au

Ben Blake
AEMO Operations
71869CONSTRAINTS17/12/2019 05:59:11 PM

Increase in Heywood from SA to Vic limit from 500 to 550 MW

AEMO ELECTRICITY MARKET NOTICE

As a part of the Heywood Interconnector upgrade the increase in the upper transfer limit from SA to Victoria is dependent on the commissioning of the over frequency generation scheme (OFGS). The OFGS has now been commissioned AEMO has completed and detailed analysis of power system limits at higher transfers.

AEMO will increase the Heywood limit from SA to Vic (from the current 500 MW) to 550 MW and the combined (Heywood and Murraylink) SA to Vic limit from 650 to 700 MW at 1000 hrs on 18 Dec 2019.

The following constraint sets will be revoked:
I-SV_500_TEST
I-SVS_650_TEST


The following constraint sets will be invoked:
I-SV_550_TEST
I-SVS_700_TEST

For more information on the increase:
ElectraNet 2019 APR: https://www.electranet.com.au/what-we-do/network/regulated-network-reports-and-studies/
Inter-network test program: https://www.aemo.com.au/media/Files/Electricity/Consultations/2015/HYTS%20interconnector%20upgrade%20internetwork.pdf

Ben Blake
AEMO Operations
65417CONSTRAINTS15/11/2018 01:43:40 PM

Reclassification of QNI SPAR as a credible contingency

AEMO MARKET NOTICE


After 25th August 2018 AEMO reclassified the loss of NSW to Qld (QNI) interconnected as a credible contingency when lightning is nearby (as per SO_OP_3715 section 11.4). The limits on QNI under this reclassification are based on the available FCAS in Queensland and NSW - normally the limit is between 300-400 MW in either direction.

Following an investigation TransGrid and Powerlink have made setting changes to the auto reclose settings on QNI and provided AEMO with a new reclassification limit on QNI. Now under similar conditions to 25th August the tripped single phases on QNI would reclose and NSW and Qld is not expected to separate.

The new limit of 850 MW will be activated at 1400 hrs November 15th 2018 for use in future reclassifications of QNI for a single phase fault on both circuits.

Constraint Set:
I-QNI_ONE_PHASE_N-2

Ben Blake
AEMO Operations
64203CONSTRAINTS13/09/2018 03:50:30 PM

Updated generator combinations for SA system strength

AEMO MARKET NOTICE

AEMO is continuing to investigate system strength requirements in South Australia.

AEMO has identified 14 additional combinations which meet minimum system strength requirements in South Australia.

New combinations:
LOW_39 - 1 x Pelican Point GT + ST + either Quarantine 5 or Dry Creek 1-3 + Mintaro
LOW_40 - 1 x Pelican Point GT + ST + Quarantine 5 + Dry Creek 1-3
LOW_41 - 2 x Pelican Point GT + ST + Osborne GT & ST
LOW_42 - 2 x Pelican Point GT + ST + Mintaro
LOW_43 - 2 x Pelican Point GT + ST + either Quarantine 5 or Dry Creek 1-3
LOW_44 - 4 x Torrens Island A unit + 1 x Pelican Point GT + ST
LOW_45A - 4 x Torrens Island A unit + Mintaro
LOW_45B - 4 x Torrens Island B unit + Mintaro
LOW_46 - 3 x Torrens Island A unit + 1 x Pelican Point GT + ST + Mintaro
LOW_47 - 3 x Torrens Island A unit + either Quarantine 5 or Dry Creek 1-3 + Mintaro
LOW_48A - 1 x Torrens Island A unit + Osborne GT & ST + either Quarantine 5 or Dry Creek 1-3 + Mintaro
LOW_48B - 1 x Torrens Island B unit + Osborne GT & ST + either Quarantine 5 or Dry Creek 1-3 + Mintaro
LOW_49 - 1 x Torrens Island A unit + 1 x Torrens Island B unit + Quarantine 5 + Dry Creek 1-3 + Mintaro
LOW_50 - 2 x Torrens Island A unit + Quarantine 5 + Dry Creek 1-3 + Mintaro

Replaced combinations:
LOW_25 - 3 x Torrens Island B unit + either Quarantine 5 or Dry Creek 1-3 + Mintaro
LOW_26 - 1 x Torrens Island A unit + 1 x Torrens Island B unit + Osborne GT & ST + Mintaro
LOW_30 - 2 x Torrens Island A unit + Osborne GT & ST + Mintaro
LOW_35 - 1 x Pelican Point GT + ST + Osborne GT & ST + Mintaro

Removed combinations:
LOW_23B
LOW_32
HIGH_14

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 October 2018.

Ben Blake
AEMO Operations
63893CONSTRAINTS15/08/2018 08:27:04 AM

New Victorian system normal voltage stability limit

AEMO ELECTRICITY MARKET NOTICE

A new Victorian system normal constraint equation has been implemented on 15 August 2018 at 0825 hrs. This constraint equation is to manage voltage stability for loss of all APD potlines for transfers from Victoria to NSW. This will most likely limit Victoria to NSW flows under light load conditions.

The new constraint equation is :
V^^N_NIL_1


Terry Liu
AEMO Operations
63440CONSTRAINTS12/07/2018 02:53:06 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 two additional generator combinations which meet minimum system strength requirements in South Australia.

The new combinations are:
HIGH_13 2 x Torrens Island A unit + 3 x Torrens Island B unit + 1 x Pelican Point GT + ST
HIGH_14 2 x Torrens Island A unit + 4 x Torrens Island B unit + 1 x Pelican Point GT + ST

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

NEM Real Time Operations Manager
63389CONSTRAINTS06/07/2018 05:06:50 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 an additional generator combination which meets minimum system strength requirements in South Australia.

The new combination is:
LOW_38 - 4 x Torrens Island B unit + 1 x Torrens Island A unit

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 July 2018.

Ben Blake
AEMO Operations
63281CONSTRAINTS28/06/2018 04:36:26 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 two additional generator combinations which meet minimum system strength requirements in South Australia.

The new combination is:
LOW_36 - 4 x Torrens Island B unit + Osborne GT & ST
LOW_37 - 4 x Torrens Island B unit + either Quarantine 5 or Dry Creek 1-3

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 July 2018.

Ben Blake
AEMO Operations
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