Market Notices

82186RECLASSIFY CONTINGENCY15/01/2021 09:33:20 PM

Reclassification of a Non-Credible Contingency Event: Eildon PS - Mt Beauty No.1 220 kV line and Eildon PS - Mt Beauty No.2 220 kV line in VIC1 due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

Reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits to now be more likely and reasonably possible. Accordingly AEMO has reclassified it as a credible contingency event.

Region: VIC1

Lines: Eildon PS - Mt Beauty No.1 220 kV and Eildon PS - Mt Beauty No.2 220 kV

Duration: 15/01/2021 21:33 until further notice

Constraint set(s) invoked:
NONE

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82185RECLASSIFY CONTINGENCY15/01/2021 08:50:45 PM

Reclassification of a Non-Credible Contingency Event: Lismore - Dunoon 9U6 132kV line and Lismore - Dunoon 9U7 132kV line in NSW1 due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

Reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits to now be more likely and reasonably possible. Accordingly AEMO has reclassified it as a credible contingency event.

Region: NSW1

Lines: Lismore - Dunoon 9U6 132kV and Lismore - Dunoon 9U7 132kV

Duration: 15/01/2021 20:50 until further notice

Constraint set(s) invoked:
NONE

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82184POWER SYSTEM EVENTS15/01/2021 06:48:36 PM

Update - Non-credible contingency event - NSW region -15/01/2021

AEMO ELECTRICITY MARKET NOTICE.

Update - Non-credible contingency event - NSW region -15/01/2021

Refer AEMO ELECTRICITY MARKET NOTICE MN 82166

At 1833 hrs the Glenn Innes - Tenterfield (96R) 132 kV Line was returned to service.

At 0947 hrs the Tenterfield - Lismore tee Casino (96L) 132 kV Line was returned to service.

The cause of this non-credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.

AEMO will not reclassify this event as a credible contingency event.

Manager NEM Real Time Operations
     
82183RECLASSIFY CONTINGENCY15/01/2021 06:42:20 PM

Reclassification of a Non-Credible Contingency Event: Hazelwood - Rowville No.1 220kV line and Hazelwood - Rowville No.2 220kV line in VIC1 due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

Reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits to now be more likely and reasonably possible. Accordingly AEMO has reclassified it as a credible contingency event.

Region: VIC1

Lines: Hazelwood - Rowville No.1 220kV and Hazelwood - Rowville No.2 220kV

Duration: 15/01/2021 18:42 until further notice

Constraint set(s) invoked:
V-HWRO_R_N-2 Constraint set contains the following interconnector(s) on the left hand side:
NONE


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82182RECLASSIFY CONTINGENCY15/01/2021 06:05:00 PM

Cancellation of a Non-Credible Contingency Event: Hazelwood - Rowville No.1 220kV line and Hazelwood - Rowville No.2 220kV line in VIC1 due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

Cancellation of reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits is no longer reasonably possible. There is no longer any lightning activity in the vicinity of the following lines. Accordingly its classification has reverted to a non-credible contingency event.

Region: VIC1

Lines: Hazelwood - Rowville No.1 220kV and Hazelwood - Rowville No.2 220kV

Cancellation time: 15/01/2021 18:04

Constraint set(s) revoked:
V-HWRO_R_N-2 Constraint set contains the following interconnector(s) on the left hand side:
NONE


Refer AEMO Electricity Market Notice 82171

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82181RECLASSIFY CONTINGENCY15/01/2021 05:27:30 PM

Reclassification of a Non-Credible Contingency Event: Bulli Creek - Dumaresq 8L 330KV line and Bulli Creek - Dumaresq 8M 330KV line in QLD1 due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

Reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits to now be more likely and reasonably possible. Accordingly AEMO has reclassified it as a credible contingency event.

Region: QLD1

Lines: Bulli Creek - Dumaresq 8L 330KV and Bulli Creek - Dumaresq 8M 330KV

Duration: 15/01/2021 17:27 until further notice

Constraint set(s) invoked:
I-QNI_ONE_PHASE_N-2 Constraint set contains the following interconnector(s) on the left hand side:
NSW1-QLD1


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82180RECLASSIFY CONTINGENCY15/01/2021 05:19:55 PM

Cancellation of a Non-Credible Contingency Event: Goonyella - Nth Goonyella T- Stoney Creek 7122 132 kV line and Goonyella - Newlands No. 7155 132 kV line in QLD1 due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

Cancellation of reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits is no longer reasonably possible. There is no longer any lightning activity in the vicinity of the following lines. Accordingly its classification has reverted to a non-credible contingency event.

Region: QLD1

Lines: Goonyella - Nth Goonyella T- Stoney Creek 7122 132 kV and Goonyella - Newlands No. 7155 132 kV

Cancellation time: 15/01/2021 17:19

Constraint set(s) revoked:
NONE

Refer AEMO Electricity Market Notice 82177

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82179GENERAL NOTICE15/01/2021 05:17:49 PM

Optimisations to Automatic Generation Control (AGC) operation

AEMO ELECTRICITY MARKET NOTICE

As detailed in Market Notice 80959, from 9-17 December AEMO undertook adjustments to AGC area tuning in the mainland regions to better cater for changes to frequency conditions that have occurred over the last few months. These changes involved altering AGC's behaviour to better utilise available Regulation FCAS resources. Changes to AGC parameters covered AGC deadbands, minor adjustments to gains, changes to make integral ACE more persistent and enablement of basepoint adjustment.

On Monday 18 January AEMO will revert the changes to the AGC basepoint adjustment. This reversion may also involve minor adjustments to other AGC paraments as necessary for stable operation, but all other major parameters are intended to remain unchanged.

This work will not change Regulation FCAS constraint equations or individual generator AGC tuning.

Details of this AGC tuning will be reported as usual in AEMO's weekly frequency reports:
https://aemo.com.au/en/energy-systems/electricity/national-electricity-market-nem/system-operations/ancillary-services/frequency-and-time-deviation-monitoring

For further queries on AGC changes contact Matthew.Holmes@aemo.com.au

AEMO Operations
     
82178RECLASSIFY CONTINGENCY15/01/2021 04:39:55 PM

Cancellation of a Non-Credible Contingency Event: Tungatinah - New Norfolk tee Meadowbank 1 110KV line and Tungatinah - New Norfolk tee Meadowbank 2 110KV line in TAS1 due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

Cancellation of reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits is no longer reasonably possible. There is no longer any lightning activity in the vicinity of the following lines. Accordingly its classification has reverted to a non-credible contingency event.

Region: TAS1

Lines: Tungatinah - New Norfolk tee Meadowbank 1 110KV and Tungatinah - New Norfolk tee Meadowbank 2 110KV

Cancellation time: 15/01/2021 16:39

Constraint set(s) revoked:
T-TU_MB_NN_N-2 Constraint set contains the following interconnector(s) on the left hand side:
NONE


Refer AEMO Electricity Market Notice 82176

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