A GUIDE TO DATA REQUIREMENTS FOR
AUSTRALIAN WIND ENERGY
FORECASTING SYSTEM (AWEFS)
PREPARED BY:
Operational Forecasting
VERSION:
0.4
DATE:
11 February 2016
FINAL
Austra lian Energy Market Operator Ltd
NEW SOUTH WALES
ABN 94 072 010 327
QUEENSLAND
SOUTH AUSTRALIA
www.aemo.com.au
VICTORIA
[email protected]
AUSTRALIAN CAPITALTERRITORY
TASMANIA
A GUIDE TO DATA REQUIREMENTS FOR AUSTRALIAN WIND ENERGY FORECASTING
SYSTEM (AWEFS)
Contents
Overview .......................................................................................................... 1
Data supply requirements for wind farms ......................................................... 1
2.1
Step 1: Wind farm and Cluster standing data ............................................................. 1
2.2
Step 2: Wind farm SCADA to AEMO .......................................................................... 1
2.3
Step 3: Wind farm plant availability to AEMO ............................................................. 3
Appendix A - Rules relating to AWEFS modelling requirements ................................... 1
A GUIDE TO DATA REQUIREMENTS FOR AUSTRALIAN WIND ENERGY FORECASTING
SYSTEM (AWEFS)
Version Release History
VERSION
DATE
BY
CHANGES
0.1
02/05/2014
Abraham Yohannan
First Draft
0.2
27/05/2014
Abraham Yohannan
Tjaart Vanderwalt
Changes made following review.
0.3
29/05/2014
Abraham Yohannan
Tjaart Vanderwalt
Catherine Sage
Final review changes.
0.4
11/02/2016
Jack Fox
Fix broken links and clarify availability
submission.
A GUIDE TO DATA REQUIREMENTS FOR AUSTRALIAN WIND ENERGY FORECASTING
SYSTEM (AWEFS)
Glossary
a) In this document, a word or phrase in this style has the same meaning as given to that term in
the National Electricity Rules.
b) In this document, capitalised words or phrases or acronyms have the meaning set out opposite
those words, phrases, or acronyms in the table below.
c) Unless the context otherwise requires, this document will be interpreted in accordance with
Schedule 2 of the National Electricity Law.
Table 1
Glossary
Term
Meaning
5MPD
5 minute Pre-dispatch
AWEFS
Australian Wind Energy Forecasting System
ECM
Energy conversion model
EMMS
Electricity Market Management Systems
ESOO
Electricity Statement of Opportunities
MTPASA
Medium-term Projected Assessment of System Adequacy
MW
Megawatts
NEM
National Electricity Market
NEMDE
NEM Dispatch Engine
NER
National Electricity Rules
PASA
Projected Assessment of System Adequacy
POE
Probability of Exceedance
SCADA
Supervisory Control and Data Acquisition
SDC
Semi-dispatch Cap
STPASA
Short term Projected Assessment of System Adequacy
UIGF
Unconstrained Intermittent Generation Forecast
A GUIDE TO DATA REQUIREMENTS FOR AUSTRALIAN WIND ENERGY FORECASTING
SYSTEM (AWEFS)
Overview
This document details the wind farm data that AEMO requires to prepare the Australian Wind Energy
Forecasting System (AWEFS) for new or existing wind farms. It supplements AEMO’s Energy
Conversion Model Guidelines.
Under National Electricity Rules (NER) Rule Clause 3.7B(a)1, AEMO is required to prepare forecasts
of the available capacity of semi-scheduled generators to schedule sufficient generation in the
Dispatch process. AEMO is also required to prepare Unconstrained Intermittent Generation
Forecasts (UIGF)2 to be used in PASA processes for reserve assessment purposes. To meet these
requirements, the AWEFS was designed to produce wind generation forecasts for all semischeduled and non-scheduled wind farms for all market system processes (Dispatch, 5MPD, Predispatch, Short term PASA and Medium Term PASA).
Data supply requirements for wind farms
2.1
Step 1: Wind farm and Cluster standing data
As per Rule Clause 2.2.7 (c) (2), all wind generators connecting to the National Electricity Market
(NEM) are required to submit3 to AEMO, an Energy conversion model consisting of the wind farm
details, historical meteorological measurements and attributes of individual clusters4. The static data
and historical measurements provided as part of the Energy conversion model assist AEMO in
choosing and developing forecasting models for wind farms.
Energy conversion model validation is a mandatory step for all new wind farms before Registration
in the NEM is approved. The following guidelines may assist in ensuring a satisfactory and timely
validation of the Energy conversion model:
(1) All data items identified as ‘mandatory’ need to be completed/provided. Incomplete data
would result in delays with validation.
(2) The ‘Cluster definition guidelines’5 need to be considered while grouping clusters.
(3) The Energy conversion model should contain a separate ‘Cluster Standing Data’ section for
each cluster.
Energy conversion model validation is a time-consuming process taking four to six weeks. To avoid
further delays, AEMO recommends that the first draft of the Energy conversion model be submitted
to AEMO at least three months before applying for Registration.
2.2
Step 2: Wind farm SCADA to AEMO
Table 3 below lists all remote monitoring (SCADA) parameters required for modelling wind farms in
AWEFS.
1
Refer Appendix A - Rules relating to AWEFS modelling requirements
Unconstrained Intermittent Generation Forecasts (UIGF) is the forecast generation output of wind farms
without considering network limitations, economical decisions or the dispatch optimisation process.
3 Energy Conversion Models can be submitted for validation via [email protected]
4 A “cluster” corresponds to a group of wind turbines of similar type (same manufacturer model) and within a
reasonable geographic area.
5 ‘Cluster Definition Guidelines’ are provided in the Energy Conversion Model
2
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A GUIDE TO DATA REQUIREMENTS FOR AUSTRALIAN WIND ENERGY FORECASTING
SYSTEM (AWEFS)
Table 2 Remote monitoring (SCADA) parameters for modelling wind farms in AWEFS
SCADA item
Measured
from
Refresh Rate
Timeline of
Procurement
Mandatory?
Wind farm SCADA
Active Power
(MW)
Connection
Point
Instantaneous
24 hours prior to first
turbine energisation
Yes
Wind farm
control
system setpoint (MW
Setpoint)
Wind farm
control system
Instantaneous
24 hours prior to first
turbine energisation
Yes6
Number of
turbines ON
(actively
generating)
Wind farm
control system
Instantaneous
24 hours prior to first
turbine energisation
Yes
Number of
turbines
available for
generation
Wind farm
control system
Instantaneous
24 hours prior to first
turbine energisation
Yes
Meteorological SCADA
Wind-speed
(m/sec)
Anemometer in
Turbine
Nacelle (AND)
Meteorological
mast
Instantaneous or 1
minute average
After first turbine is
energised (Nacelle
measurement)
& After met mast is
commissioned (for met
mast measurement)
Yes
Wind
direction
(Degrees)
Anemometer in
Turbine
Nacelle (AND)
Meteorological
mast
Instantaneous or 1
minute average
After first turbine is
energised (Nacelle
measurement)
& After met mast is
commissioned (for met
mast measurement)
Yes
Ambient
Temperature
Anemometer in
Turbine
Nacelle (AND)
Meteorological
mast
Instantaneous
After first turbine is
energised (Nacelle
measurement)
& After met mast is
commissioned (for met
mast measurement)
Yes
The remote monitoring data is used to generateg forecasts in the Dispatch and 5 minute Pre-dispatch
(5MPD) timeframes.
Wind farms need to consider the following points when designing SCADA parameters:
(1) Wind farm control system set-point (MW Setpoint):
I.
Under normal conditions, when a wind farm is not constrained off or down-regulated,
the MW setpoint SCADA should reflect a value above the wind farm's registered
maximum capacity, but below 250% of it.
6
Following consultation in 2013. http://www.aemo.com.au/Consultations/National-ElectricityMarket/Open/Amendment-to-the-Energy-Conversion-Model-Guidelines
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A GUIDE TO DATA REQUIREMENTS FOR AUSTRALIAN WIND ENERGY FORECASTING
SYSTEM (AWEFS)
II.
During periods of down-regulation or when a wind farm is constrained off, the MW
set-point SCADA should reflect the setpoint applied in the wind farm's control system
to limit (down regulate) its output to at or below the level required by AEMO or the
NSP. The set-point could either be AEMO’s or the Wind farm’s setpoint value.
(2) Number of turbines ON (actively generating): This should indicate the number of wind
turbines that are actively generating at the wind farm at any given time.
(3) Number of turbines available for generation: This should indicate the number of turbines that
are available to generate at the wind farm. This includes:
I.
turbines that are actively generating.
II.
turbines available to generate, but not operating due to ambient conditions (high/low
wind speed, high temperature).
III.
turbines available to generate, but paused due to down-regulation (constrained off).
However, it should not include turbines under maintenance, repair, damage or being
manufactured.
The number of turbines available for generation SCADA should always indicate a value that
is equal to or greater than the number of turbines ON (actively generating).
The following guidelines may assist in ensuring compliance with AEMO’s remote monitoring
requirements:
(1) Meteorological SCADA (listed in Table 2) needs to be provided from the turbine nacelle
(measured from the nacelle of a turbine that reasonably represents the location of the wind
farm) and meteorological masts.
(2) All SCADA parameters need to be tested (in co-ordination with AEMO/TNSP/DNSP) prior to
commissioning, to ensure communication with AEMO’s Energy Management System is
functional.
(3) All SCADA parameters should be functional based on the ‘Timeline of Procurement’ listed in
Table 2. AEMO may not provide approval to commence commissioning tests without
sufficient SCADA visibility.
(4) Compliance with the Power System Data Communications Standard is required at all times.
(5) The MW setpoint SCADA should be designed to update automatically rather than manually.
2.3
Step 3: Wind farm plant availability to AEMO
Rule Clause 3.7B (b) requires wind farms to advise AEMO of their plant availability information. This
information is used to generate the forecasts for Pre-dispatch, Short term PASA and Medium term
PASA processes. The plant availability information is submitted via AEMO’s Electricity Market
Management Systems Web Portal.
The following table summarises the data that needs to be submitted via the web portal.
Table 3 Wind farm plant availability data
Data Items
Description
Number of turbines
unavailable in each Cluster
This information is used by AWEFS to determine the generation
capability of the wind farm.
Upper MW Limit
Any MW restriction (or limit) that would prevent the wind farm from
generating to its capability. The restriction could either be an internal
wind farm limitation or a limitation applied on the wind farm (by AEMO
or the NSP) due to network limitations.
The Turbines Unavailable and Upper MW Limit entered via AEMO’s EMMS Web Portal do not apply
to the Dispatch and 5 minute Pre-dispatch timeframes; to manage local limits in the Dispatch and 5
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A GUIDE TO DATA REQUIREMENTS FOR AUSTRALIAN WIND ENERGY FORECASTING
SYSTEM (AWEFS)
minute Pre-dispatch timeframes refer to the Guide to Intermittent Generation document on the
AEMO website.
A Guide to submitting the above information via the Web Portal is available at: Guide to Intermittent
Generation.
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A GUIDE TO DATA REQUIREMENTS FOR AUSTRALIAN WIND ENERGY FORECASTING
SYSTEM (AWEFS)
Appendix A - Rules relating to AWEFS modelling requirements
This section details the various rule requirements to be met by wind farm proponents, to enable
AEMO to model the wind farm in AWEFS.
Table 1 Rules relating to modelling wind farms in AWEFS
Rule Clause
Requirement
3.7B (a)
AEMO must prepare a forecast of the available capacity of each semischeduled generating unit (to be known as an unconstrained intermittent
generation forecast) in accordance with this rule 3.7B for the purposes of:
(1) the projected assessment of system adequacy process;
(2) dispatch; and
(3) pre-dispatch.
2.2.7 (c)
AEMO must approve a request for classification as a semi-scheduled
generating unit if it is satisfied that the output of the generating unit is
intermittent and that the person:
……
(2) has submitted an energy conversion model which contains the
information described in the guidelines referred to in paragraph (d);
(3) has adequate communications and telemetry to support the issuing of
dispatch instructions and the audit of responses.
S5.2.6.1
The remote monitoring quantities referred to under paragraph (a) that AEMO
may request include:
…
(b)(2)(iv) active power and reactive power for the generating system;
(b)(5) in respect of a wind farm type of generating system:
(i) wind speed;
(ii) wind direction;
(iii) ambient temperature; and
(b)(6) any other quantity that AEMO reasonably requires to discharge its
market and power system security functions as set out in Chapters 3 and 4.
(b)(8) if a wind farm type of generating system:
(i) number of units operating;
(ii) wind speed; and
(iii) wind direction,
3.7B (b)
A Semi-Scheduled Generator must:
(1) submit to AEMO, in accordance with the timetable, the plant
availability for each semi-scheduled generating unit for the purpose
of paragraph (a) as soon as the Semi-Scheduled Generator
becomes aware that the plant availability of the unit is at least 6MW
below or above the nameplate rating of the unit; and
(2) where the Semi-Scheduled Generator has submitted plant
availability in accordance with subparagraph (1), notify AEMO in
accordance with the timetable as soon as the Semi-Scheduled
Generator becomes aware of any changes to the plant availability of
that semi-scheduled generating unit until such time as the plant
availability of that semi-scheduled generating unit is no longer at
least 6MW below or above the nameplate rating of the unit.
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