Filter by category
Filter by Date
New system normal constraint equation in NSW for voltage collapse at Balranald
TransGrid has advised AEMO of a new voltage collapse limit in south west NSW, which is required to prevent voltage collapse at Balranald following a loss of a 220 kV line in north-west Victoria (either Bendigo to Kerang, Kerang to Wemen or Buronga to Red Cliffs lines). The limit applies to pre-contingent flow on Balranald to Darlington Point (X5) 220 kV line. The constraint equation is likely to bind when there is high generation in south-west NSW.
The constraint equation includes generators in south-west NSW and north-west Victoria on the left-hand side as well as Murraylink and VIC1-NSW1.
The following constraint equation will be implemented at 1000 hrs Friday 20th November 2020.
N^^N_NIL_3
For full details on the factors this constraint equation has now been loaded into AEMO's pre-production systems.
For further details on this new constraint equation please contact ben.blake@aemo.com.au
Ben Blake
AEMO Operations
Update to system strength requirements in North Queensland
Refer to market notice 78616
AEMO and Powerlink are continuing to investigate system strength requirements in North Queensland.
Following recent control setting changes at Mt Emerald wind farm the system strength limits on Mt Emerald wind farm, Sun Metals Solar farm and Haughton Soar Farm have been revised.
A revision to the constraint equations will be implemented at 0900 hrs Friday 13th November 2020.
The new combinations are 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 equations in the Q-NIL set of the form below will be modified:
Q_NIL_STRGTH_HAUSF
Q_NIL_STRGTH_MEWF
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
Mya San
AEMO Operations
New system normal constraint equations for thermal overload in south west Victoria
AEMO has reviewed the thermal limits in south west Vic with the recent addition of new generators in the area. With a further increase in generation capacity in south west Victoria AEMO has identified potential thermal issues on the south west Victorian 500 kV network. AEMO will implement three new constraint equations which will manage loading on the Haunted Gully to Moorabool, Mortlake to Moorabool and Moorabool to Sydenham lines for other 500 kV line trips in south-west Victoria. These constraint equations are unlikely to bind until there is a further increase in generation in south-west Victoria.
The constraint equations include generators in western Victoria and the Heywood and Murraylink interconnectors on the left-hand side.
The following constraint equations will be implemented at 1000 hrs 30th October 2020.
V>>V_NIL_15
V>>V_NIL_16
V>>V_NIL_17
For full details on the factors these constraint equations have now been loaded into AEMO's pre-production systems.
For further details on these new constraint equations please contact ben.blake@aemo.com.au
Ben Blake
AEMO Operations
West Murray issue and limit on Murraylink
Refer to market notice 77189
Following further technical assessment of the issues impacting grid performance and operational stability in the West Murray region AEMO has identified that limiting the flow on the Murraylink interconnector from SA to Vic is no longer required.
The constraint set I-SVML_095 will be revoked at 1200 hrs on 15th Octber 2020.
Ben Blake
AEMO Operations
Update to Vic to NSW voltage collapse limit
Refer to market notice 77600
AEMO has completed work on a revised system normal voltage stability limit at Victoria for flows from Victoria to New South Wales. This limit is to manage voltage collapse around Murray for the loss of all APD potlines.
The constraint equation includes generators in south-west NSW and north-west Victoria on the left-hand side as well as VIC1-NSW1. Full details on the limits advice are published on the AEMO website: https://www.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 generation.
This revised limit will be implemented to the following constraint equation at 1000 hrs Friday 9th October 2020.
V^^N_NIL_1
For further details on this constraint equation please contact terry.liu@aemo.com.au
Terry Liu
AEMO Operations
Update to system strength requirements in North Queensland
Refer to market notice 77646
AEMO and Powerlink are continuing to investigate system strength requirements in North Queensland.
A revision to the constraint equations will be implemented at 0900 hrs Friday 9th October 2020.
The new combinations are 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 equations in the Q-NIL set of the form below will be modified:
Q_NIL_STRGTH_XXX
For further details please contact James Lindley at james.lindley@aemo.com.au or Simon Taylor at businessdevelopment@powerlink.com.au
Mya San
AEMO Operations
New constraint for UFLS in South Australia
As part of a suite of recommendations to restore under frequency load shedding (UFLS) capability and mitigate risks, AEMO is updating and expanding existing network constraints to keep power flows across the Heywood interconnector within limits that allow South Australia's UFLS to operate effectively if needed.
The following constraint equation will be added to the South Australian system normal set at 1100 hrs Friday 9th October 2020.
V_S_HEYWOOD_ULFS
A fact sheet on the new constraint equation is available here: https://aemo.com.au/-/media/files/initiatives/der/2020/heywood-ufls-constraints-fact-sheet.pdf
Support Information:
For further details on this constraint equation please contact the AEMO Information and Support Hub supporthub@aemo.com.au or call 1300 236 600.
Ben Blake
AEMO Operations
Update to system strength requirements in North Queensland
Refer to market notice 76608
Powerlink have revised the strength requirements in North Queensland. AEMO has updated the related constraint equations and these will be implemented at 1000 hrs Friday 11th September 2020.
The new and revised combinations are now published in a limits advice document on AEMO's website: 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 and replaces all the previous advice.
The constraint equations in the Q-NIL set of the form below will be modified:
Q_NIL_STRGTH_XXX
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
Update to Vic to NSW voltage collapse limit
Refer to market notice 63893
AEMO is currently revising the existing voltage collapse constraint equation for Victoria to NSW transfers for the simultaneous loss of all APD potlines. The existing equation requires a review for record low Victorian demands and high transfers to NSW. To reduce the instances of AEMO invoking discretionary limits while this review is being completed an offset of 250 MW will be applied to the existing constraint equation.
This change will occur at 1400 hrs 9th September 2020.
The following constraint equation will be modified:
V^^N_NIL_1
For further details on this new constraint equation please contact ben.blake@aemo.com.au
Ben Blake
AEMO Operations