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58845CONSTRAINTS19/07/2017 05:03:02 PM
Constraint invoked to manage power system security in SA region
AEMO ELECTRICITY MARKET NOTICE
Refer to market notices 58785
Constraint Invocation to manage power system security in SA Region
In order to maintain sufficient fault levels in SA and hence a secure operating state, the following constraint set was invoked at 1500hrs which operates in both Dispatch and Pre-Dispatch:
S_WIND_1200_AUTO
This constraint equation automates the process of applying the 1200 MW limit on the wind farms. If there is enough synchronous generation online it will be "swamped" out by adding 10000 to the right-hand side, otherwise the 1200 MW limit will be applied.
Ben Blake
AEMO Operations
Refer to market notices 58785
Constraint Invocation to manage power system security in SA Region
In order to maintain sufficient fault levels in SA and hence a secure operating state, the following constraint set was invoked at 1500hrs which operates in both Dispatch and Pre-Dispatch:
S_WIND_1200_AUTO
This constraint equation automates the process of applying the 1200 MW limit on the wind farms. If there is enough synchronous generation online it will be "swamped" out by adding 10000 to the right-hand side, otherwise the 1200 MW limit will be applied.
Ben Blake
AEMO Operations
55470CONSTRAINTS25/10/2016 04:11:14 PM
Change to FCAS Regulation constraint equations for managing time error
AEMO ELECTRICITY MARKET NOTICE
Change to FCAS Regulation constraint equations for managing time error
AEMO is changing the way the FCAS constraint equations work for automatically increasing the regulation when the time error exceeds 1.5s in the Mainland. Currently the regulation is required from all NEM regions when there is a Mainland (NSW, Qld, SA and Victoria) time error.
The change to be made is to set the FCAS regulation requirements for Mainland regions only when there is a Mainland time error exceedance.
The FCAS requirements from all NEM regions of 120 MW lower regulation and 130 MW raise regulation has not changed.
The calculation for the regulation is detailed in SO_OP3715, section 19.
This change will take effect at 1700 hrs on 25 October 2016.
Ben Blake
AEMO Operations
Change to FCAS Regulation constraint equations for managing time error
AEMO is changing the way the FCAS constraint equations work for automatically increasing the regulation when the time error exceeds 1.5s in the Mainland. Currently the regulation is required from all NEM regions when there is a Mainland (NSW, Qld, SA and Victoria) time error.
The change to be made is to set the FCAS regulation requirements for Mainland regions only when there is a Mainland time error exceedance.
The FCAS requirements from all NEM regions of 120 MW lower regulation and 130 MW raise regulation has not changed.
The calculation for the regulation is detailed in SO_OP3715, section 19.
This change will take effect at 1700 hrs on 25 October 2016.
Ben Blake
AEMO Operations
54609CONSTRAINTS25/07/2016 01:18:19 PM
Updates to Victorian system normal stability constraint equations
AEMO ELECTRICITY MARKET NOTICE
The Victorian system normal constraint equations that determine Victorian export limits based on transient stability and voltage stability at Heywood for Victoria to South Australia flows will be updated to a revised formulation on 25 July 2016 after 1330 hrs. This revised formulation models the effects of higher flows on Victoria to SA on Heywood and the new series capacitors at Black Range.
The changes are to the following constraint equations :
V::N_NIL_V1
V::N_NIL_V2
V::N_NIL_Q1
V::N_NIL_Q2
V::N_NIL_S1
V::N_NIL_S2
V::N_NIL_SD
V^S_HYCP
Ben Blake
AEMO Operations
The Victorian system normal constraint equations that determine Victorian export limits based on transient stability and voltage stability at Heywood for Victoria to South Australia flows will be updated to a revised formulation on 25 July 2016 after 1330 hrs. This revised formulation models the effects of higher flows on Victoria to SA on Heywood and the new series capacitors at Black Range.
The changes are to the following constraint equations :
V::N_NIL_V1
V::N_NIL_V2
V::N_NIL_Q1
V::N_NIL_Q2
V::N_NIL_S1
V::N_NIL_S2
V::N_NIL_SD
V^S_HYCP
Ben Blake
AEMO Operations