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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: Protected event advice - South Australia region
AEMO has identified that the conditions of the following protected event are no longer met.
Protected event: the loss of multiple transmission elements causing generation disconnection in the South Australia region during periods where destructive wind conditions are forecast by the Bureau of Meteorology.
Cancellation: 08/08/2019 23:55 hrs
Constraint set(s) revoked: I-VS_250
Refer AEMO Electricity Market Notices 69177
Manager NEM Real Time Operations
Protected event advice - South Australia region.
AEMO has identified that the conditions of the following protected event will be met from the time specified in this notice.
Protected event: the loss of multiple transmission elements causing generation disconnection in the South Australia region during periods where destructive wind conditions are forecast by the Bureau of Meteorology.
Duration: 08/08/2019 12:00 hrs until further notice
AEMO will take action to manage the power system for the impact of the protected event.
Constraint set(s) invoked: I-VS_250
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
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 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
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 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