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Increase in Heywood from SA to Vic limit from 500 to 550 MW
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
Cancellation of Actual (LOR3) condition in the Vic region - 25/01/2019
Cancellation of Actual (LOR3) condition in the Vic region - 25/01/2019
The Actual LOR3 Condition in the Vic region advised in AEMO Electricity Market Notice No.66768 is cancelled at 1350 hrs 25/01/219.
Manager NEM Real Time Operations
Actual Lack Of Reserve Level 3 (LOR3) in the Vic region - 25/01/2019
Actual Lack Of Reserve Level 3 (LOR3) in the Vic region - 25/01/2019
Customer load shedding of non-interruptible load is occurring in the Vic region as a result of a shortfall of available capacity reserves.
An Actual LOR3 condition has been declared under clause 4.8.4(b) of the National Electricity Rules for the Vic region from 1100 hrs.
The Actual LOR3 condition is forecast to exist until 1500 hrs.
The load interrupted is 100 MW at 1100 hrs 25/01/2019. This may be varied during the actual LOR3 period.
Manager NEM Real Time Operations
Cancellation of Actual (LOR3) condition in the Vic region - 24/01/2019
Cancellation of Actual (LOR3) condition in the Vic region - 24/01/2019
The Actual LOR3 Condition in the Vic region advised in AEMO Electricity Market Notice No.66670 is cancelled at 2000 hrs 24/01/2019.
Manager NEM Real Time Operations
Actual Lack Of Reserve Level 3 (LOR3) in the Vic region - 24/01/2019
Actual Lack Of Reserve Level 3 (LOR3) in the Vic region - 24/01/2019
Customer load shedding of non-interruptible load is occurring in the Vic region as a result of a shortfall of available capacity reserves.
An Actual LOR3 condition has been declared under clause 4.8.4(b) of the National Electricity Rules for the Vic region from 1810 hrs.
The Actual LOR3 condition is forecast to exist until 1910 hrs.
The maximum load to be interrupted is 266MW at 1810 hrs 24/01/2019
Manager NEM Real Time Operations
Reclassification of QNI SPAR as a credible contingency
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
Updated generator combinations for SA system strength
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
New Victorian system normal voltage stability limit
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
Updated generator combinations for SA system strength
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