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WE M Re for m Pr og r a m Co mmunic a tio ns a nd Co ntro l Re q uire me nts WRIG 29 October 2020 1. Principles Ag e nda 2. Preliminary Analysis 3. Linear Ramping 4. Fast Start Facilities 5. Sent-Out to As-Generated Conversion 6.

  1. WE M Re for m Pr og r a m Co mmunic a tio ns a nd Co ntro l Re q uire me nts WRIG – 29 October 2020

  2. 1. Principles Ag e nda 2. Preliminary Analysis 3. Linear Ramping 4. Fast Start Facilities 5. Sent-Out to As-Generated Conversion 6. Invoking Network Constraints Example footer text 5/11/2020 2

  3. Princ iple s • Require minimal changes to existing SCADA infrastructure. • Re-use existing SCADA points for new market features where possible. • Look to “ramp” planned outage constraints into/out of service over a period of time to minimise impact.

  4. Pre limina ry Ana lysis • Facilities that meet the existing Communication and Control Requirements will not require any new SCADA points. • Potential exception: Fast Start Facilities • However, Facilities may need to undergo commissioning to tune linear ramping via AGC. • Some existing SCADA points may be de-commissioned (no longer required) • e.g. ramp rate setpoints

  5. L ine a r Ra mping • Achieve smooth, linear ramps between dispatch targets with minimal overshoot, or as close as possible. • AGC system will combine linear basepoint ramping with any regulation signals if the facility is enabled for Regulation Raise or Lower. • Dispatch Engine constraints will prevent a facility for being dispatched for a Regulation Raise/Lower quantity and new basepoint that is unachievable at the facility’s ramp rate. • Question for participants: are there any of your facilities that require an exemption from linear ramping? If so, please explain why.

  6. L ine a r Ra mping E xa mple AGC Ramping (machine ramp rate 15 MW/min) 125 120 115 110 105 MW 100 95 90 85 80 7:59:31 8:00:14 8:00:58 8:01:41 8:02:24 8:03:07 8:03:50 8:04:34 8:05:17 8:06:00 Previous interval market dispatch point New market dispatch point DI setpoint (current market) AGC basepoint Desired MW setpoint Actual MW (current market) Actual MW (new market)

  7. F a st Sta rt • Quick overview of principles • Explain NEM process • WEM options • Re-use forward looking dispatch instruction points • Require new Fast Start SCADA point

  8. F a st Sta rt I nfle xib ility Pro file Wher ere: T1, T2, T3, T4 ≥ 0 T1 + T2 ≤ 30 mins T1, T2, T3, T4 ≤ 60 mins MR 7.4.38 MR 7.4.40

  9. NE M Pro c e ss • Two-step process to determine Fast Start Facility dispatch • Step one run ignores FSIP • Step two applies FSIP based on results of first run, and re-runs • Fast Start is not an “ahead” commitment process. • If pre-dispatch indicates a Facility will likely receive a dispatch in 10 minutes time, it will not receive the start signal until the interval itself. • Fast Start Facilities can opt to commit earlier as per any other facility, and rebid to ensure appropriate quantities clear for ramp and minimum running period.

  10. F a st Sta rt F a c ility Dispa tc h E xa mple First Pass (FSIP not applied) Second Pass (FSIP applied) Minimum Loading Shutdown profile 50 45 40 35 30 MW 25 20 15 10 5 0 0 5 10 15 20 25 30 35 40 45 50 55 60 Time (minutes) T3 T3 T4 T4 T1 T1 T2 T2

  11. F a st Sta rt SCADA Re q uire me nts • Existing NEM approach uses the analogue MW setpoint at a high value to indicate start/stop (4001 for start, 4004 for stop). • Does not require any additional SCADA points, but would require reconfiguration of facility control systems. • Alternative approach could use existing/new points to indicate starts and stops (e.g. re-purposing existing lookahead setpoints). • Different approaches may work for different facilities. • AEMO seeks feedback from participants on the following items: • Are you considering registering any of you facilities as Fast Start Facilities? If so, which ones? • For these facilities, do you have a preference in which point is used by AEMO to signal a fast-start dispatch?

  12. Se nt-o ut to As-Ge ne ra te d Dispa tc h T a rg e t Co nve rsio ns • Clause 7.6.17(b) requires AEMO to document this process. • Alternatively, participant can do the conversion at their end. • In either case, compliance is to the sent-out target (clause 7.10.1). • For participants who currently receive as-generated Dispatch Targets, we can work with either approach.

  13. Se nt-o ut to As-Ge ne ra te d Dispa tc h T a rg e t Co nve rsio ns • Proposed approach would be for participants to provide an equation which can be encoded within AEMO’s Energy Management System (EMS). • This equation could be piece-wise to account for multiple operating modes if required. • The equation can consist of fixed parameters, or data available to AEMO via the SCADA system, including: • Operating mode (if relevant) • Mills in service • Local ambient temperature (if available) • MW measurement of auxiliary load(s) • AEMO would document the process for altering and updating this equation in the relevant procedure, and how the logic will work where SCADA is bad/unavailable. • AEMO seeks feedback on the following questions: • Are you considering applying for AEMO to perform an sent-out to as-generated conversion of Dispatch Instructions for any of your facilities? If so, which ones? • For these facilities, do you believe existing telemetry is sufficient to perform this calculation?

  14. Ne two rk Outa g e Co nstra ints in Dispa tc h

  15. Re a ltime Co nstra ints E xa mple 1 – Ba sic dispa tc h Gen ener erator Paym yment System Cost: $1,000 G A $1,000 G B $0

  16. Re a ltime Co nstra ints E xa mple 2 – Pe a k dispa tc h Gen ener erator Paym yment System Cost: $2,500 G A $3,000 G B $1,000

  17. Re a ltime Co nstra ints E xa mple 3 – Ne two rk c o nstra int Gen ener erator Paym yment System Cost: $2,700 G A $2,600 G B $1,400

  18. Re a ltime Co nstra ints E xa mple 4 – Ne two rk o uta g e c o nstra int ?

  19. Ne two rk Outa g e Co nstra ints Pre -dispa tc h / PASA Network ratings Constraint Outage + WEMDE Equation Schedule SCADA mapping Database Published Outage Approval Forced Outage Market Pre-Dispatch Market Data / PASA Outcomes AEMO Planning AEMO Controller Realtime Engineer Offline

  20. Ne two rk Outa g e Co nstra ints Co ng e stio n I nfo rma tio n Re so urc e Network ratings Constraint Outage + WEMDE Equation Schedule SCADA mapping Database Published Market Data Constraint Congestion Congestion Library Reporting Outcomes Realtime Congestion Information Resource Offline

  21. F e e db a c k Re q ue ste d • Are there any of your facilities that you believe require an exemption from linear ramping? If so, please provide details. • Are you considering registering any of your facilities as Fast Start Facilities? If so, which ones? • For these facilities, do you have a preference as to which point is used by AEMO to signal a fast-start dispatch? • Are you considering applying for AEMO to perform a sent-out to as-generated conversion of Dispatch Instructions for any of your facilities? If so, which ones? • For these facilities, do you believe existing telemetry is sufficient to perform this calculation? Please send any responses to wrig@energy.wa.gov.au with the subject: “20201029 WRIG Responses”.

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