WE M Re for m Pr og r a m Co mmunic a tio ns a nd Co ntro l Re - - PowerPoint PPT Presentation

WE M Re for m Pr

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Co mmunic a tio ns a nd Co ntro l Re q uire me nts

WRIG – 29 October 2020

Ag e nda

5/11/2020 Example footer text 2

• 1. Principles
• 2. Preliminary Analysis
• 3. Linear Ramping
• 4. Fast Start Facilities
• 5. Sent-Out to As-Generated Conversion
• 6. Invoking Network Constraints

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.

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

L ine a r Ra mping

• Achieve smooth, linear ramps between dispatch targets with minimal
• vershoot, 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.

L ine a r Ra mping E xa mple

80 85 90 95 100 105 110 115 120 125 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

MW

AGC Ramping (machine ramp rate 15 MW/min)

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)

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

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

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.

F a st Sta rt F a c ility Dispa tc h E xa mple

T1 T1 T2 T2 T3 T3 T4 T4

5 10 15 20 25 30 35 40 45 50 5 10 15 20 25 30 35 40 45 50 55 60

MW Time (minutes)

First Pass (FSIP not applied) Second Pass (FSIP applied) Minimum Loading Shutdown profile

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
• nes?
• For these facilities, do you have a preference in which point is used by AEMO to signal a

fast-start dispatch?

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.

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?

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

Re a ltime Co nstra ints E xa mple 1 – Ba sic dispa tc h

System Cost: $1,000 Gen ener erator Paym yment GA $1,000 GB $0

Re a ltime Co nstra ints E xa mple 2 – Pe a k dispa tc h

System Cost: $2,500 Gen ener erator Paym yment GA $3,000 GB $1,000

Re a ltime Co nstra ints E xa mple 3 – Ne two rk c o nstra int

System Cost: $2,700 Gen ener erator Paym yment GA $2,600 GB $1,400

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

?

Ne two rk Outa g e Co nstra ints Pre -dispa tc h / PASA

Outage Schedule Constraint Equation Database Network ratings + SCADA mapping WEMDE Published Market Data Realtime Offline Pre-Dispatch / PASA Market Outcomes Outage Approval

AEMO Planning Engineer AEMO Controller

Forced Outage

Ne two rk Outa g e Co nstra ints Co ng e stio n I nfo rma tio n Re so urc e

Outage Schedule Constraint Equation Database Network ratings + SCADA mapping WEMDE Published Market Data Constraint Library Congestion Reporting Congestion Information Resource Realtime Offline Congestion Outcomes

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”.