Market Notices

101028CONSTRAINTS16/08/2022 11:57:21 AM

Update to Vic to NSW voltage collapse limit

AEMO ELECTRICITY MARKET NOTICE

Refer to Market Notice 82819

AEMO has completed a comprehensive review of the system normal voltage stability limit for loss of all APD potlines for flows from Victoria to New South Wales. The revised limit is the result of latest network configuration, comprehensive generation/load patterns, and recent commissioned generators in Victoria and southern NSW which could potentially mean higher transfers into NSW under some generation/load scenarios.

The revised constraint equation includes generators in southern NSW, north-west Victoria and hydro generation at Mt. Beauty on the left-hand side as well as VIC1-NSW1 and Murraylink. Full details on the limits advice are to be published on 18/08/2022 on the AEMO website: https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/congestion-information-resource/limits-advice

The constraint is most likely to bind when there is low Vic demands and high transfers to NSW. When it binds it will restrict Vic to NSW transfers and southern NSW units.

This revised limit will be implemented to the following constraint equation at 1000 hrs Thursday 18th August 2022.
V^^N_NIL_1

For further details on this constraint equation please contact terry.liu@aemo.com.au


Terry Liu
AEMO Operations
     
101018CONSTRAINTS16/08/2022 09:23:02 AM

Update to System strength requirements in North Queensland

AEMO ELECTRICITY MARKET NOTICE

Refer to market notice 93841

AEMO and Powerlink are continuing to investigate system strength requirements in North Queensland.
Due to reduced numbers of Gladstone units online, the system normal equations have been revised to include below combination.

-If Stanwell >=2, Stanwell + Calllide >=3, Gladstone >= 1, Stanwell + Callide + Gladstone >= 7, Kareeya >=2, Haughton Syncon status = ON, North Queensland load >=250 MW,
Ross+FNQ load >=100 MW, limit Mt Emerald Windfarm to 80% and no limit to other solar farms.

A revision to the constraint equations will be implemented at 1100 hrs on Tuesday 16th August 2022.

The new combinations will be published in a limits advice document on AEMO's website on Wednesday 17th August 2022.
For more information refer to the new limits advice: https://www.aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/congestion-information-resource/limits-advice

This advice contains all the combinations for Queensland for system normal cases.

The constraint equations in the Q-NIL set of the form below will be modified:

Q_NIL_STRGTH_CLRSF
Q_NIL_STRGTH_COLSF
Q_NIL_STRGTH_DAYSF
Q_NIL_STRGTH_HAMSF
Q_NIL_STRGTH_HAUSF
Q_NIL_STRGTH_HAYSF
Q_NIL_STRGTH_KEP
Q_NIL_STRGTH_KIDSF
Q_NIL_STRGTH_MEWF
Q_NIL_STRGTH_RUGSF
Q_NIL_STRGTH_RRSF
Q_NIL_STRGTH_SMSF
Q_NIL_STRGTH_WHTSF

AEMO Operations
     
99413CONSTRAINTS24/06/2022 01:18:44 PM

Update to SA to Victoria limits for Para SVC outage

AEMO ELECTRICITY MARKET NOTICE

AEMO has been working with ElectraNet on a review of the oscillatory stability limits for the Para SVC outage for flows from South Australia to Victoria.

From that review the these limits from SA to Vic have been increased by 50 MW. The limit on Heywood has changed to 470 MW and for Heywood + Murraylink to 620 MW when the oscillatory stability monitoring is in service. If oscillatory monitoring is not in service the 50 MW increase will not apply.

The revised constraints were implemented in the constraint set S-PA_VC1 at 1300 hrs Friday 24th June 2022:
S:VS_PASVC_570OSC_AT
S:VS_PA_SVC_620
S:V_PASVC_420OSC_AT
S:V_PA_SVC_470
SV_470_DYN

AEMO and ElectraNet are continuing their studies on the limits for the Para SVC outage to determine if further increases can be made.

For further details on this this change please contact ben.blake@aemo.com.au

Ben Blake
AEMO Operations
     
95690CONSTRAINTS01/04/2022 09:00:20 AM

Update to Vic to NSW transient stability limit

AEMO ELECTRICITY MARKET NOTICE

AEMO has completed a comprehensive review of the system normal transient stability limit for loss of a Hazelwood to South Morang 500 kV line for flows from Victoria to New South Wales. The revised limit takes into account a larger range of inertias, demands, interconnector flows and many different plants online. The revised limit is generally lower than the existing limit due to lower demands and inertias in the Victorian system since the last review back in 2016. However, it is expected the revised limit will normally be under-cut by the Victorian export voltage collapse limit for loss of all APD potlines.

The revised constraint equation includes generators in southern NSW and generation in Victoria on the left-hand side as well as interconnectors. Full details on the limits advice are to be published on 04/04/2022 on the AEMO website: https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/congestion-information-resource/limits-advice

This revised limit will be implemented to the Victorian system normal constraint set V-NIL at 1000 hrs Tuesday 5th April 2022, with the following changes:

Constraint equations to remove:
- V::N_NIL_V
- V::N_NIL_S
- V::N_NIL_Q1
- V::N_NIL_Q2
Constraint equations to add:
- V::N_NIL_V1
- V::N_NIL_V2
- V::N_NIL_O1
- V::N_NIL_O2

These constraint equation changes have already been applied in AEMO's PreProduction systems.

For further details on the constraint equations please contact terry.liu@aemo.com.au

Terry Liu
AEMO Operations
93862CONSTRAINTS14/01/2022 04:02:41 PM

Updated generator combinations for SA

AEMO MARKET NOTICE

Refer to market notice 92769

AEMO has published new generator combinations for South Australia:
- 1 for four synchronous condenser operation
- 9 for two synchronous condenser operation

Details on the new combinations and conditions for their use is in the updated limits advice (which was published earlier today):
https://www.aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/congestion-information-resource/limits-advice

For further details please contact ben.blake@aemo.com.au

Ben Blake
AEMO Operations
93841CONSTRAINTS13/01/2022 01:22:58 PM

Update to System strength requirements in North Queensland

AEMO ELECTRICITY MARKET NOTICE

Refer to market notice 89836

AEMO and Powerlink are continuing to investigate system strength requirements in North Queensland.
Due to commissioning of Haughton syncon, the system normal equations have been revised.

A revision to the constraint equations will be implemented at 0900hrs on Friday 14th January 2022.

The new combinations have now published in a limits advice document on AEMO's website: For more information refer to the new limits advice: https://www.aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/congestion-information-resource/limits-advice

This advice contains all the combinations for Queensland for system normal cases.

The constraint equation in the Q-NIL set of the form below will be modified:

Q_NIL_STRGTH_CLRSF
Q_NIL_STRGTH_COLSF
Q_NIL_STRGTH_DAYSF
Q_NIL_STRGTH_HAMSF
Q_NIL_STRGTH_HAUSF
Q_NIL_STRGTH_HAYSF
Q_NIL_STRGTH_KEP
Q_NIL_STRGTH_KIDSF
Q_NIL_STRGTH_MEWF
Q_NIL_STRGTH_RUGSF
Q_NIL_STRGTH_RRSF
Q_NIL_STRGTH_SMSF
Q_NIL_STRGTH_WHTSF


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

AEMO Operations
92840CONSTRAINTS01/12/2021 11:21:45 AM

Update to system normal constraint equation in NSW for voltage collapse at Darlington Point

AEMO ELECTRICITY MARKET NOTICE

Refer to Market Notice 90954

TransGrid has advised AEMO of a revision to the Darlington Point to Wagga (63) 330 kV line voltage collapse limit due to changes in a control scheme in the area. With this change the current voltage collapse limit will be replaced by a transient voltage limit - and allow for increased flows on 63 line.

AEMO has reviewed the limit advice and will make the following constraint equation changes at 1300 hrs Wednesday 1st December 2021:
Add - N::N_NIL_63
Remove - N^^N_NIL_2

The limit is for pre-contingent flow on 63 line. The constraint equation includes generators in south-west NSW and north-west Victoria on the left-hand side as well as Murraylink.


Ben Blake
AEMO Operations
92769CONSTRAINTS26/11/2021 04:04:18 PM

Updated generator combinations for SA for four synchronous condenser operation

AEMO MARKET NOTICE

Refer to market notice 92718

AEMO has published 15 new generator combinations for four synchronous condenser operation in South Australia.

These new 15 combinations (as well as the 6 published previously) apply under system normal, risk of islanding and SA island conditions.

For more details on the new combinations please refer to the updated limits advice (which was been published today):
https://www.aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/congestion-information-resource/limits-advice

For further details please contact ben.blake@aemo.com.au

Ben Blake
AEMO Operations
92718CONSTRAINTS25/11/2021 04:33:15 PM

Update to system strength limit advice for SA - four synchronous condenser operation

AEMO ELECTRICITY MARKET NOTICE

Refer to market notice 91942

AEMO and ElectraNet have been working on moving to four synchronous condenser operation in South Australia. Due to current market and power system conditions AEMO is moving to four synchronous condenser operation for system normal conditions as of 1900hrs 25th November 2021.

Refer to the six generator combinations in Table 3 of the current limits advice (v39) here:
https://www.aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/congestion-information-resource/limits-advice

Further SA generator combinations will be published tomorrow.

SA operation factsheet:
https://www.aemo.com.au/-/media/files/electricity/nem/security_and_reliability/congestion-information/sa-operation-with-minimum-2-synchronous-generators-aemo-factsheet.pdf?la=en

For further details please contact ben.blake@aemo.com.au

Ben Blake
AEMO Operations
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