Trading Operations in the Philippine WESM
Philippine Electricity Market Corporation
Objectives Familiarize the participant with the WESM operations. Describe the responsibilities of the different entities involved, specifically the Trading Participants, the Market Operator, and the System Operator. Provide an overview of the scheduling and dispatch in WESM Establish the WESM Timetable Show an illustration of the dispatch implementation
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Introduction A clear definition and delineation of responsibilities are necessary to ensure the reliable operation of the grid, especially with the Market Operator (MO) and the System Operator (SO) being two separate entities – Dispatch Protocol Issue 6.0 As a result, the WESM Manual on the Dispatch Protocol was formulated after rigorous discussions between MO and SO The Dispatch Protocol Clearly establishes the WESM Timetable for the execution of specific processes (WESM Rules 3.4.2 and 10.4.8.1) Establish scheduling and dispatch procedures to be followed in Normal Conditions Emergency Conditions that should be consistent with the WESM Timetable and features of the MMS 3
Scheduling and Dispatch Procedures Prior to WESM Operations Scheduling and dispatch of generating facilities were the sole responsibility of SO SO was also responsible in demand forecasting Generating facilities were required to submit daily nominations of capacities they want to be scheduled for dispatch on the following day Regardless of contractual commitments of generating units, the SO shall prepare a day-ahead generating schedule using the nominations considering system conditions and requirements such as (1) load forecasts, (2) weather forecasts, (3) reliability and security standards, and (4) scheduled outages Week-ahead nominations were also required by SO
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Scheduling and Dispatch Procedures Prior to WESM Operations Nomination of available capacities
1 2 3 4
System Operator Forecast of demand Scheduling - forecast (load and weather) - security and reliability - scheduled outages
Day –Ahead Schedules Energy and Reserve
The Day-Ahead schedules shall be implemented by SO subject to changes at real-time (forecast error, tripping, etc.)
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Scheduling and Dispatch upon Establishment of WESM Operations WESM was established as the trading platform of energy transactions in grids with WESM operations (Luzon and Visayas) WESM was also established as the central platform for the scheduling and dispatch of generating facilities with WESM operations SO is still responsible in the dispatch of generating units at realtime MO has the responsibility of forecasting demand, and prepares a Security Constrained Economic Dispatch (SCED) schedule of generators and loads based on the hourly demand bids and generation offers. MO also maintains a Market Network Model (MNM) which shall be used by the Market Dispatch Optimization Model (MDOM), which shall be able to consider transmission constraints and losses 6
Responsibilities in WESM’s Scheduling and Dispatch The Market Operator (MO), System Operator (SO), and Trading Participants (TPs) are the three entities involved in the scheduling and dispatch of generating facilities in WESM
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MO Responsibilities in Scheduling and Dispatch Maintenance of the Market Network Model (MNM) in coordination with the SO Generation of dispatch schedules using the MDOM Transmittal of dispatch schedules to the SO for implementation
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SO Responsibilities in Scheduling and Dispatch Submission of overriding constraints to ensure the reliable operation of the grid Outage Schedule - List of Equipment (e.g. generators, lines, transformers, breakers, etc.) that will be out of service for a certain defined period. Contingency List - List of Equipment enlisted for contingency analysis (As Per Grid Code: N-1 Contingency Requirement). Security Limits - List of Generators and Branch Groups that will have its limits overridden for security purposes (e.g. MRU/testing/commissioning). Transmission Limits - list of transmission capacities of lines and transformers to be consider in the scheduling process Implementation of the dispatch schedules provided by MO Issuance of deviation report to MO (actual vs. schedule) 9
TP Responsibilities in Scheduling and Dispatch Submission of bids and offers to WESM consistent with the WESM Timetable Comply to the dispatch instructions of SO
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Scheduling and Dispatch upon Establishment of WESM Operations
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WESM Timetable Trading activities in WESM operate at different time frames Week Ahead Projection (WAP) Day Ahead Projection (DAP) Hour-Ahead or Real-Time Dispatch (RTD) Real-Time Ex-post (RTX)
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WESM Timetable: WAP The Week-Ahead Projection (WAP) gives indicative hourly dispatch schedules and spot prices for the next seven days Its results serve as a guide to the following entities Participants when bidding transactions in the market for the next seven days SO in the determination of the cost impact of planned outages It considers the following information, which shall be used by the Market Management System (MMS) to generate schedules Demand bids and energy offers from Trading Participants Demand forecasts Outage Schedules Security Limits Latest available system snapshot 13
WESM Timetable: WAP WAP is executed every day to produce results for the next seven days
Execution of WAP at Day D D-1
D
D+1
D+2
Study Period of WAP at Day D (From D+1 to D+7) D+3
D+4
D+5
TRADING DAYS
D+6
D+7
D+8
D+9
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WESM Timetable: WAP WAP is executed at 0900H of each trading day …
4
5
6
7
Prior to 0900H, the following activities are made for D+1 to D+7 Gathering of weather forecasts Preparation of demand forecasts Submission or revision of bids and offers
8
9
TRADING HOURS
10
11
12
13
14
15
WAP Results and Analysis Coordination with SO
WAP Execution
The latest information provided by SO prior to 0900H shall be used System Snapshot Outage Schedule Security Limit Transmission Limit Contingency List
16
17
18
19
…
Publish WAP Results in WEB
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WESM Timetable: DAP The Day-Ahead Projection (DAP) gives indicative hourly dispatch schedules and spot prices covering the succeeding hours of the day up to the end of the following day It allows the SO to prepare a more accurate contingency plan for the relevant intervals It considers the following information, which shall be used by the Market Management System (MMS) to generate schedules Demand bids and energy offers from Trading Participants Revisions of bids and offers for consideration in the DAP run can be done until a cut-off time (four hours prior to the trading hour) Demand forecasts Outage Schedules Security Limits Latest available system snapshot 16
WESM Timetable: DAP DAP is executed every four hours to produce results for the succeeding hours until the end of the following day …
4
0400H DAP
5
6
DAP Results Analysis Coordination with SO
7
8
9
0800H DAP
TRADING HOURS
10
11
12
13
1200H DAP
14
15
16
17
18
19
…
1600H DAP
DAP Results Analysis Coordination with SO is done up until 1 hour after the DAP execution
The latest information provided by SO prior to each DAP run shall be used The latest bids and offers shall be used. Submission or revision of bids and offers relevant to the succeeding hours can be made prior to the execution of the DAP run. Demand forecasts for each of the succeeding hours evaluated by the DAP run should be provided prior to its execution. Revisions may still be implemented prior to the DAP run
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WESM Timetable: DAP DAP Study Period DAP Run at Current Day “D”
Study Horizon From
To
0400H
0500H of D
2400H of D
0800H
0900H of D
2400H of D
1200H
1300H of D
2400H of D+1
1600H
1700H of D
2400H of D+1
2000H
2100H of D
2400H of D+1
2400H
0100H of D+1
2400H of D+1
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WESM Timetable: RTD The Hour-Ahead or Real-Time Dispatch publishes schedules that shall be implemented by SO, and spot prices that shall be used in the settlement of market transactions The RTD schedules are subject to the final screening of SO before a dispatch instruction is issued to a Trading Participant The dispatch schedule is the target MW loading of all Trading Participants at the end of a trading interval
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WESM Timetable: RTD RTD is executed every 55th minute of the hour RTD Execution for Trading Hour HH
The latest information provided by SO prior to each DAP run shall be used Gate Closure for bids and offers
40
50
HH-2
00
10
20
30
Target Interval HH
Trading Interval HH 40
HH-1
50 0 0 10
Transmit RTD Schedules and MOT to SO Publish results in WEB
20
30
40
HH
50
00
Dispatch Implementation for HH to meet Target Schedule
10
20
30
HH+1
40
20
WESM Timetable: RTX The Real-Time Ex-Post (RTX) represents the duration of the trading interval It is not used by the SO in the dispatch implementation since it is merely used for “price discovery”, in which its results represent the actual events that transpired for the duration of the trading interval Its results are used to settle imbalances in the market (schedule vs. actual)
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WESM Timetable: RTX RTX is executed every 1st minute of the hour
The latest information provided by SO prior to each DAP run shall be used
RTX Execution for Trading Hour HH
Trading Interval HH
40
50
00
HH-2
10
20
30
40
50 0 0 10 HH-1
20
30
40
50
00
HH
10
20
30
40
HH+1
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During Normal Conditions Majority of the day-to-day activities in the market fall under the category of normal conditions WESM Tasks during Normal System Condition Activities
Procedure in the Dispatch Protocol
Bids and Offers
Appendix A.1
Outage Scheduling
Appendix A.3
Demand Forecasting Contingency Planning
Pre-Dispatch Market Projections Real-Time Dispatch Schedule Dispatch Implementation System Status Report Post Dispatch Report
Market Information Publication Daily Operational Report
Appendix A.2 Appendix A.4 Appendix A.5 Appendix A.6
Appendix A.7 Appendix A.8
Responsible Group MO X X X X
Appendix A.9
X
Appendix A.11
X
Appendix A.10
SO
X
X X X X X
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During Emergency Conditions WESM Rules 6.3.1.1 states that an emergency condition is a situation which has an adverse effect on electricity supply or which poses a significant threat to system security Classification of Emergency Events Market Operations Market Failure Medium-term supply deficiency Effects of force majeure events
MMS Failure Communication network Breakdown Computer systems failure
Site-related Emergencies
System Operations System Failure Total system Collapse
Grid Islanding or Isolation Multiple forced Outages
Threat to system Security
EMS Failure Communication network Breakdown
Computer systems failure Site-related Emergencies
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During Emergency Conditions WESM Rules 6.3.1.1 states that an emergency condition is a situation which has an adverse effect on electricity supply or which poses a significant threat to system security WESM Tasks during Normal System Condition Activities
Procedure in the Dispatch Protocol
System Emergency and Restoration
MO
SO
--
X
X
--
X
Market Suspension and Intervention
Appendix B.2
Report and Documentation of Events
--
EMS Disaster Recovery Procedures
MMS Disaster Recovery Procedures
Responsible Group
--
X X
X X
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Sample Normal Dispatch Process FOR THE 0900H TARGET TRADING INTERVAL (08:01 AM UNTIL 09:00 AM) SUBMISSION OF ENERGY OFFERS
RTD WORKFLOW RUN FOR 0900H
SUBMISSION OF SO OVERRIDING CONSTRAINTS
7:00 AM
8:00 AM
9:00 AM
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Sample Normal Dispatch Process FOR THE 0900H TARGET TRADING INTERVAL (08:01 AM UNTIL 09:00 AM) MERIT ORDER TABLE
RTD SCHEDULES
DEVIATIONS ARE REPORTED TO MO IN CONSIDERATION OF NON-COMPLIANCE AND MUST-RUN UNITS
SYSTEM OPERATOR
FOR IMPLEMENTATION
FINAL DISPATCH INSTRUCTIONS WILL COME FROM SO
FOR INFORMATION TRADING PARTICIPANTS C
A B
D
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End of Presentation
