Challenges & Experiences in AMR Application to Support the
Philippine WESM
Emmanuel M. SotomilSr. Dept. Manager & HeadMetering Services Group
National Transmission Corporation
Renato B. AfurongMetering Unit HeadPhilippine Electricity MarketCorporation (PEMC)
Presentation Outline
� Overview of the Philippine WESM� Market Structure and Coverage� Supply – Demand Balancing� Metering Requirements� Meter Data Processing for Trading Settlements
� Challenges to TRANSCO as WESM MSP� The TRANSCO WESM Metering Project
� Project Milestones� Present State of TRANSCO’s Metering/AMR System� “Birth Pains” of the Metering/AMR System
� Other Valuable Experiences
Philippine Wholesale Electricity Spot Market (WESM)
� Established by the Philippine Department of Energy (DOE) in accordance with the Electric Power Industry Reform Act of 2001
� Philippine Electricity Market Corporation (PEMC) was created to develop and operate the WESM.
Philippine Wholesale Electricity Spot Market (WESM)
� WESM is the venue for buyers and sellers engage in the trading of electricity as a commodity.
� PEMC shall establish, maintain and govern an efficient, competitive, transparent and reliable market for the wholesale trade of electricity.
MARKET STRUCTUREOF PHILIPPINE WESM
� PEMC is the Market Operator (MO)� Regulator : Energy Regulatory Commission (ERC)� TRANSCO is Transmission Provider , System Operator ,
& default Metering Service Provider (MSP)� Sellers : Generation Companies (NPC, others)
Suppliers/Supply AggregatorsIPP Administrators
� Buyers : Distribution UtilitiesElectricity End-users/Load CustomersSuppliers/Supply Aggregators
� Other entities authorized by ERC according to Law.
WESM COVERAGE
Luzon – Commercial Operation June 2006
Visayas – Commercial Operation is set to start January 2008Trial Operation is on-going
Mindanao – Will follow after Visayas Commercial Operation
Initially, only entities connected to the Grids and with a capacity of 1MW and higher are admitted in the WESM.
DEMAND – SUPPLYBALANCING
Generation Companies
(GenCo’s)
Customers(DU’s, EC’s,
LC’s, Suppliers
and/or Aggregators)
OffersOffers BidsBids
Supply SideSupply Side Demand SideDemand Side
Price
P= /MWH
0.8
0.7
0.9
1.00
P
WESM METERING REQUIREMENTS
� Meters and Instrument Transformers Accuracy Class.
� Blondel’s Theorem Compliance of metering circuit.
� Meter Functionalities:� Load Profile Meter Data Memory
� Data Communication Ports for On-site & Remote Data Access using an AMR System or proprietary meter data retrieval software
� Connectivity to MSP’s AMR System for daily meter data retrieval and delivery to the MO
� Metering Facility Integrity Certification by the MSP
� Metering Facility Registration with the MO
DAILY METER DATA PROCESSINGT
radi
ng P
artic
ipan
ts MSP’s AMR System
1. Daily retrieval of previous day meter data by AMR: 12AM to 4AM
2. Meter Data Validation
3. Transmit meter data to M.O.: 6 - 8 AM
MO’s MDCSMARKET
MANAGEMENT SYSTEM
15-minute MDEF
MO’s Settlement System
Settlement Ready Data
MTRMTR
1. Receiving of Meter Data from MSP’s AMR System
2. Meter Data undergoes Validation, Estimation & Editing (VEE)
3. SSLA: Translation of Metered Energy to Market Trading Node
4. Posting of Settlement-Ready Meter Data in the Settlement System
VALIDATION, ESTIMATION & EDITING
ESTIMATION & EDITINGUse data from alternate meters or SCADA dataWhere no alternate meter or SCADA data is available:� Estimation based on interpolation between values
for short-duration cases of missing data� Use historical value for the same hour of the
previous day (weekdays)� Use historical value for the same day of previous
last week (weekends)
Missing meter data
If value is invalid, a Meter Trouble Report (MTR) is issued to the MSP.
Values Outside Min/Max Limits
For defective Main Meter, the Check or Alternate meter data is substituted.
Check or Alternate Meter
CORRECTIVE MEASURECHECK FOR:
METER TROUBLE REPORTING & RESOLUTION
� MO issues an MTR to the MSP for meters that failed the validation process
� MSP performs the following upon issuance of the MTR :
• Investigate the problem
• Perform repairs as required
• Provide substitute meter data
� MO estimates remain in place until MSP provides met er data acceptable to MO.
SITE-SPECIFIC LOSS ADJUSTMENT (SSLA)
� Load Customer’s Metering Points are required to be at the Market Trading Node (MTN)
� For Metering Points not located at the Market Trading Node: customer meter data measured at the metering point is translated to the MTN.
� The Adjusted Meter Data is inclusive of Line and Transformer Losses between the MTN and Metering Point.
M1
M2
MTN
Metering Point 1
Metering Point 2
Power Transformer
Outside the limit
Outside the limit
Manually Approved
Manually Approved
Within the limit (automatically
approved)
Within the limit (automatically
approved)
Validation
Estimation
& Editing
Validation, Estimation, & Editing
SETTLEMENT
CONVERT CD XLS(DEL & REC)
TO SQL
CALCULATE RTUFACTOR THEN
CONVERT TO SQL
SOURCE DATAPREPARATION
FOR SSLA
Y
Monthly Meter Data Process Flow
OK
COMPARISONOF MDW,
MDCS & CD
OK
COMPARISON GEN RTU AND
GEN CD
OK
M
T
R
EVALUATEMSP CD
DAILY MQFROM MDCS
DAILY MQFROM MDW
DAILY AVESNAPSHOT(GEN RTU)
N
Y
N
MSP RECONCILED CD
START
N
Y
N
OKCOMPARISON OF
SQL AND XLS(QC/SUMMARY)
SSLACALCULATION
CONVERT SSLA XLS TO SQL
OKCOMPARISON OF
RAW SSLA AND CD(QC/SUMMARY)
COMPARISON OF SQL AND XLS
(QC/SUMMARY)
UPLOAD
TO
MDW
N
N
Y
Y
Y
COMPARISON OF SQL AND XLS
(QC/SUMMARY)
OK
N
Y
OK
N
AGGREGATED MQ(FOR MARKET
FEES)
COMPARISON OF GEN DEL AND CD DEL
(QC/SUMMARY)
OK
AGGREGATED MQ(NODAL)
COMPARISON OF NODAL AND CD(QC/SUMMARY)
OKY
N
APPROVED
FOR
SETTLEMENT
ENERGY BALANCE
Y
N
METERING & AMR CHALLENGES OF PHILIPPINE WESM
In 2003, TRANSCO organized the Metering Services Groupto perform TRANSCO’s role as default WESM Metering Service Provider.
� No AMR System was in place.
� TRANSCO had NO AMR EXPERIENCE, but had SCADA experience since the mid-80’s.
� The NPC Plants, accounting for roughly 60% of total generation capacity, had no revenue metering facilities.
� Metering facilities of Grid-connected Load Customers and IPP’s were equipped with meters with Load Profile Data storage capability but less than 20% were AMR-ready.
METERING & AMR CHALLENGESOF PHILIPPINE WESM
TRANSCO undertook a WESM Metering Project that started in 2004, with the following components:1. Automated Meter Data Retrieval (AMR) System for all Grid-
connected metering points.2. Upgrading of revenue metering facilities of Customers:
� New, AMR-ready electronic meters� Meter communication links to the AMR System.
3. Revenue metering equipment for NPC power plants:
� Instrument transformers� AMR-ready electronic meters� Meter communication links to the AMR System
METERING POINTS BEFORE WESM METERING PROJECT
� Most of NPC and IPP Power Plants were served by TRANSCO’s PSTN Digital Telephone System.
� Customers’metering points are in receiving substations that are not served by TRANSCO’s phone system.
� GSM service reaches almost all sites.
REMARKS
0133. IPP Plants
0
145
0
166
160
376
AMR-Ready
Meters
METERING
POINTS
A. LUZON 1. Customers
C. MINDANAO 1. Customers
0252. NPC Plants
145886PHILIPPINES
0202. NPC Plants
0203. IPP Plants
0733. IPP Plants
0332. NPC Plants
B. VISAYAS 1. Customers
AREAS
TRANSCO WESM METERING PROJECT MILESTONES
� Decision on AMR Strategy was made in mid-2003, to use an industry-tested System designed for a multi-meter vendor situation and dial-up connection via PSTN & GSM links.
� Tenders for the AMR System and the first batch of AMR-ready electronic meters were issued in November 2003.
� The AMR System:
� November 2004: Hardware and software components were delivered.
� June 2005: Vendor completed the Luzon AMR Stationinstallation and testing, and training of AMR Station operating staff.
� April 2006: Luzon AMR Station was ready for service.
TRANSCO WESM METERING PROJECT MILESTONES
� AMR-Ready Electronic Meters:
� February 2005: First Batch of 582 Meters delivered.
� April 2005: Installation of AMR-Ready Meters on the 476 metering points in Luzon completed.
� April 2007: Second batch of 225 Meters delivered, to complete all the requirements for AMR-ready meters.
� Telephone Links:
� June 2006: Connectivity of Luzon metering facilities to the AMR System was achieved using PSTN and GSM links (80 PSTN + 394 GSM).
� September 2007: A batch of 325 GPRS-capable GSM Modems have been delivered.
THE TRANSCO AMR SYSTEM
Workstations Server
Switch
Firewall
RouterCentral AMR Station
WAN
Router
Firewall
WorkstationsServer
Switch
VisMin AMR Station
Workstations ServerSwitch
Firewall
RouterBackup AMR Station
Remote Metering Points
•GSMGSMGSMGSM•DTSDTSDTSDTS
•TELCOTELCOTELCOTELCO
•GSMGSMGSMGSM•DTSDTSDTSDTS
•TELCOTELCOTELCOTELCO
•GSMGSMGSMGSM•DTSDTSDTSDTS
•TELCOTELCOTELCOTELCO
•GSMGSMGSMGSM•DTSDTSDTSDTS
•TELCOTELCOTELCOTELCO
Workstations Serve
r
Switc
h
Firewal
l
Rout
er
PEMCMarket Operator
Luzon Visayas/Mindanao
Via dial-up
TransCo Billing System
NPC TOU Billing
Via E-mail
•GSMGSMGSMGSM•DTSDTSDTSDTS
•TELCOTELCOTELCOTELCO
•GSMGSMGSMGSM•DTSDTSDTSDTS
•TELCOTELCOTELCOTELCO
Present State of the TRANSCO AMR System
March 2008
� Tested and ready for installation.
� Installation to commence after construction of AMR Station Building.
3. National Back-up AMR Station
N/AAlready tested and in service since April 2007.
2. Vis/Min AMR StationTransCo-VisayasRegional Office, Cebu
N/A
ECD
In service to the WESM since April 2006.
Status/On-going Work
1. Luzon AMR StationTransCo Head Office
AMR Station
PRESENT STATE OF WESM METERING POINTS
Read by
AMRW/Tel. Link
w/AMR-Ready
Meters
METERING
POINTS
A. LUZON
C. MINDANAO
44501661. Customers
001252. NPC Plants
004133. IPP Plants
8816202. NPC Plants
8818203. IPP Plants
737373733. IPP Plants
3743743763761. Customers
333333332. NPC Plants
4949155
B. VISAYAS
1601. Customers
AREAS
“BIRTH PAINS” OF TRANSCO’sWESM METERING PROJECT
� High Failure Rate of AMR-ready Electronic Meters.
� Meters would fail within a few days from installation.
� A recall program that lasted at least 9 months was done by the meter manufacturer to change meters/modify meter electronics.
� AMR System – Meter Compatibility Issues
� Significant Meter Data Drop-out cases were initially experienced.
� Proprietary meter software was temporarily used for remote meter data retrieval until a new AMR Driver was developed by the AMR Supplier for the meter.
OTHER VALUABLE EXPERIENCES
Comparison of Telephone Connection between AMR System and Meters – Availability, Reliability and Cost
Approx. 8c/min.
$35 Fixed Subscription + Approx. 15c/min.
Not quantified
OPEXCAPEX
$350-400 per Meter
VERY GOODPractically
everywhere
GSM Cell Phone Service
BETTER THAN TRANSCO’s
Service limited to urban areas
PRIVATE PSTN
LOWGOODServes NPC Power Plants & most IPP’s
TRANSCO PSTN
COSTRELIABILITYAVAILABILITY
OTHER VALUABLE EXPERIENCES
� Duration for retrieving 4 – Channels of Meter Data: KWH Delivered, KWH Received, KVARH Delivered & KVARH Received at 15-Minute Interval:
� For first-time retrieval, the operation can take as long as 30 minutes and even longer for some meters.
� Succeeding retrieves last 2 – 6 minutes for 24-hour’s meter data depending on meter make.
� AMR Workstation Loading : For a 5-hour meter data retrieval window, 80 Meters/Workstation, with a 25% allowance for “retries”.
� Data Reject & Retrieval Failure Rate is down to <5%from 20-25% when the System was deployed in 2006.
CONCLUSIONS
� AMR System – Meter Compatibility is critical to avoid surprises in getting the system to work.
� Go with tried and tested meters whose bugs with an AMR System have been corrected.
� The meter’s load profile data log set-up can greatly affect duration and cost of meter data retrieval .
� Doing the work in-house preserves knowledge.
� With knowledge gained, TRANSCO and PEMC are better prepared to handle the metering and AMR challenges of the next phases of the WESM.
End of Presentation.Thank you!
