Seminar on Renewable Energy Technology implementation in Thailand Experience transfer from Europe co‐organised by the Delegation of the European Union to Thailand and the Department of Alternative Energy Development and Efficiency Ministry of Energy Efficiency, Ministry of Energy PV Performance: Impact to the grid M Titi S t h PhD Ms.Titiporn Sangpetch, PhD System Planning Division Electricity Generating Authority of Thailand (EGAT) October 4, 2012
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Seminar on Renewable Energy Technology implementation in Thailand
Experience transfer from Europe
co‐organised by the Delegation of the European Union to Thailand and the Department of Alternative Energy Development and
Efficiency Ministry of EnergyEfficiency, Ministry of Energy
PV Performance: Impact to the gridM Titi S t h PhDMs.Titiporn Sangpetch, PhD
System Planning DivisionElectricity Generating Authority of Thailand (EGAT)y g y ( )
October 4, 2012
OutlineOutline1. Introduction
2. Current status of Thailand’s ESI
3. Evolutionary challenges on renewable energy policies
4 EGAT’s practices for grid impact assessment4. EGAT s practices for grid impact assessment
5. PV performance and its impact to the grid
6. Proposed optimal path to integrating solar generation
4 October 2012 2
1 Introduction1. Introduction
• Reduction of CO2 Emission
• Growing demand for green energy from new and renewable
resources
• More distributed generations (DG) and integration ofMore distributed generations (DG) and integration of
intermittent renewable energy onto the power system
M i t i i th t ‘ li bl d t bl ’ i l• Maintaining the power system ‘reliable and stable’ in long-run
in use of high energy efficiency manner
4 October 2012 3
2 Current Status2. Current Status
DG
Generation Transmission Distribution CustomersSPP
(7%)IPP
(39.6%)EGAT(46.6%)
VSPP(<<1%)
Import(6.7%)
Generation
EGAT (100%)Transmission
PEA(68%)
MEA(30%)
Direct Customer(2%)
Distribution
Customers Customers
Note: Reference on 31 July 2012
4 October 2012 4
Note: Reference on 31 July 2012
2 Current StatusInstalled Capacity 32,184.7 MW
2. Current Status
((August August 20122012))
Peak Demand 26,121.1 MW ((26 26 April April 20122012))
Combine CycleCombine CycleThermal Thermal
Combine CycleCombine Cycle1177,,548548..00 MWMW
5555%%
88,,589589..77 MWMW2727%%
RE RE 55 622622 66 MWMW
Gas Turbine & DieselGas Turbine & Diesel 124124..44 MWMW 00..33%%
55,,622622..66 MWMW 1717%%
Renewable Energy Renewable Energy 55 622622 66 MWMW
of the year*Solar 14 0 27Solar 14 0 27Wind 12 2 2Biomass 30 15 36Biogas 22 7 0Municipal Solid Waste 43 32 36Mi i h dMini‐hydro 50 27 36
Note: System peak-time is at 14:00 -15:00 hr. during March – May of the year
284 October 2012
5 2 Impact to the Grid5.2 Impact to the Grid
• Impacts of high penetration of solar PV generationonto power grid
• voltage and power flow fluctuation
• Frequency fluctuation
• Difficulty of demand-supply management
4 October 2012 29
5 2 Impact to the Grid5.2 Impact to the Grid
Bus Voltage ( 115 kV Feeder)
120 0
122.0
124.0
Bus Voltage ( 115 kV Feeder)
114.0
116.0
118.0
120.0
kV
108.0
110.0
112.0
106.0
TIME Voltage (Before)
Voltage (After)
Example of voltage fluctuation – before and after having the transmission system reinforcement in order to improve the system voltages and to enhance system reliability.
Voltage (After)
4 October 2012 30
5 2 Impact to the Grid5.2 Impact to the Grid
30.0
40.0
MW (115 kV feeder from PV plant)
12.0
14.0
MVAR (115 kV Feeder from PV plant)
0.0
10.0
20.0
MW 6.0
8.0
10.0
MVA
R
40 0
-30.0
-20.0
-10.0
M
0.0
2.0
4.0
-40.0
TIME MW (Before)MW (After)
TIME MVAR (Before)MVAR (After)
Example of power fluctuation – before and after having the transmission system reinforcement in order to improve the system voltages and to enhance system reliability.
4 October 2012 31
6. Proposed optimal path to integrating the solar generationthe solar generation6.1 System criteria to follow6.2 Countermeasures to consider6.3 Methodology for long-term power system planning
324 October 2012
6 1 System criteria6.1 System criteria
• Economic efficiency
• Environmental compatibilityConsiderations
Environmental compatibility
• System reliability/ parameters:
– load demand in multiple yearsGen.
Adequacy1. Existence of sufficient facilities to satisfy Load D d
Security1. Ability of the system to respond to System Disturbances – load demand in multiple years
– adequacy of energy
– capacity credits of RE power plantsTrans.
Demand
2. To be associated with Static Conditions (not including system disturbances)
Disturbances
2. To be associated with dynamic conditions and transient behavior
3. System disturbances dealing with: capacity credits of RE power plants
– availability / outage rate
• Robustness of energy security
Dist.Gens+T&D = Loadallpoints
dealing with:• Loss of major Gen• Loss of Trans. Facilities
• Robustness of energy securitySystem reliability
334 October 2012
6 2 Countermeasures6.2 Countermeasures
• Improvement of load following capability • Reduction of minimum operation of existing and new thermal
/ hydro power plants
• Improvement of RE forecast
• Demand activation
• Utilization of energy storage, e.g.gy g , g– Hydro pumped storage power plant,
– Battery storage,y g ,
– Etc.
344 October 2012
6 3 Proposed methodology6.3 Proposed methodology
Data of eachobservation point
Available current and future load assets and other
Generation analysis includingload, assets, and other
conditions analysis, including smoothing effect
Load frequency control analysis and other
l i
Probabilistic production analysis, using Load Duration
C (LDC)
Time series load dispatch analysis, using Time Series Load
C
analysis
Curve (LDC) Curve
Generation and Transmission Operation Cost Operation
Ms. Titiporn Sangpetch, PhDSystem Planning DivisionElectricity Generating Authority of Thailandec c y Ge e a g u o y o a a dTel. +66 2436 3542 / E-mail: [email protected]