Planning Principles & Load Dispatching Natthajak Chomsiridechanan Medium-term Operation Planning Section Generation Operation Planning Department Power System Control and Operation Division [email protected]tel. 02-436-2183 IPP&SPP Seminar 16 November 2015 1
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• Reliable supply of electricity– Adequacy– Security (N-1)
• Quality Standard- Voltage- Frequency
• Reasonable Production cost• Environment Awareness
Operation Planning Objectives
3
• Long Term– Generation outage plan– Tariff calculation– Financial analysis & Budget– Fuel supply plan– Problem warning
• Medium Term– Energy resources planning for typical day and holiday season– Plant commissioning program Considerations– Determine Transmission Outage– Place secondary fuel orders in advance of desired delivery date
• Short Term– 48 periods plan for day ahead planning
Operation Planning Criteria
4
• 1-5 Years (Monthly Basis)• Economics (GDP)• EPPO data; Residential, Business, Industrial Growth• Historical Data (PEA, MEA and direct sales)
• Monthly Energy from Long Term forecasting• 1-4 Months (Daily Basis)• Historical Data (Pattern)• Long Holidays and Festivals
• 1 Day (Half-Hour Basis)• 5 Region – CAC, NEC, SAC, NAC, MAC• Weather Forecasting• Historical Data (Pattern)
Demand ForecastingLong Term
Medium Term
Short Term
5
Outage Scheduling• Light Load Days base on calendar year • Table of AP Weight base on marginal cost• Peak and Off-Peak in accordance with historical
Outage SchedulingPartially DispatchPeak and Off-Peak notice (Capacity Payment)Month ahead
10,000
12,000
14,000
16,000
18,000
20,000
22,000
24,000
0:00
2:
00
4:00
6:
00
8:00
10
:00
12:0
0 14
:00
16:0
0 18
:00
20:0
0 22
:00
0:00
MW
Weekday - Summer Weekday - Winter
10,000
12,000
14,000
16,000
18,000
20,000
22,000
24,000
0:00
2:
00
4:00
6:
00
8:00
10
:00
12:0
0 14
:00
16:0
0 18
:00
20:0
0 22
:00
0:00
MW
Sunday - Summer Sunday - Winter 8
SPP
Mechanism
Dispatch Plan
Dispatching Limitations
Must Run Unit
• System Securities (N-1)
Must Take
• Purchase Contract• Fuel Supply Contract
Irrigation• EGAT’s Hydro Generation
Dispatchable
• Efficiency & Fuel Price
TransmissionSystem
Capability
Minimum take
BB, SK,SNR, VRK, RPB, LTK
Cost Rank
26%
25%
7%
42%
Ratio of Total Capacity
58%
9
East Gas- Natural Gas Fields- Gas Separation Plant- LNG 760 MMSCFD (Up to 1000 MMSCFD in Q4 2016)
- Maximum Supply 1,300 MMSCFD- Wobbe Index 1160-1280 BTU/SCF
West Gas- Natural Gas Fields- Maximum Supply 1,260 MMSCFD- Heating Value >803 BTU/SCF- Partially Supply: Yadana+Yetagun or Yadana+Zawtika- Totally Shutdown in case of Yadana gas shortage
Limitation (Gas Supply)
10
Limitation (Gas Pipeline)
South BKK
Wangnoi
Bang Pakong
EPEC
C1,2
RPCL
North BKK
C3
TECO
GPSCGlowIPP
Myanmar Gas
SPP Navanakorn, Rangsit U-Thai
NongSaeng
Gulf Power
RB
SB+NBWest < 459 MMSCFDMix < 609 MMSCFD
SPP Nakhon Sawan
WN+GPG+EPEC+GNS+GUT
< 904 MMSCFD
SPP Korat
RA#6-NB,SB Non-EGAT 25 MMSCFD
BVW1-RA#6Non-EGAT 81 MMSCFD
RA#6
Common HeaderEast Gas
SBE < 220 MMSCFD
“Gas Pipeline Configuration from 23 Sep 2015 Onward” 11