Mae Hong Son PV ProjectMae Hong Son PV ProjectMae Hong Son PV ProjectMae Hong Son PV Project

May 2004May 2004

Research and Research and Development OfficeDevelopment Office

Electricity Generating Auth Electricity Generating Auth ority of Thailand ority of Thailand

EPPOEPPO EGAT

OutlineOutline

• IntroductionIntroduction

• Existing Existing ppower ower ssupply and upply and ddemandemand

• Scope of worksScope of works

• SpecificationsSpecifications

• System OperationSystem Operation

• Benefit of projectBenefit of project

Introduction of Mae Hong Son PV ProjectIntroduction of Mae Hong Son PV Project

- Area 12,681- Area 12,681 kmkm22.. (1,268,100 acre)(1,268,100 acre) - Mountain and forest- Mountain and forest ~~ 7 788 % % of total area of total area- 9- 9 NN ational forest reserv ational forest reserveses- 7- 7 PP ermanent forest bou ermanent forest boundariesndaries- 4- 4 WW ild life sanctuaries ild life sanctuaries- 3- 3 NN ational parks ational parks- 3- 3 FF orest parks orest parks- 4- 4 AArboretumsrboretums- Population 230,000 (in 1- Population 230,000 (in 1997997

Outline of Power SupplyOutline of Power Supply1.1. Mae Hong Son is the only one province where electricity can nMae Hong Son is the only one province where electricity can n

ot be directly transferred from EGAT ot be directly transferred from EGAT HVHV transmission lines transmission lines

(115 kV)(115 kV) , except PEA's distribution lines , except PEA's distribution lines (22 kV)(22 kV)

2.2. EGAT’s plan of 115 kV transmission linesEGAT’s plan of 115 kV transmission lines was terminated was terminated becbec

ause of forest reservation reasonause of forest reservation reason

3.3. The power plants are rather small so electricity supply will be lThe power plants are rather small so electricity supply will be l

ess than the future demandess than the future demand

4.4. Mae Hong Son is the forest reservation area for the main Mae Hong Son is the forest reservation area for the main

purpose of tourismpurpose of tourism

5.5. EGAT EGAT installinstalleded 6 6 units of 1,000units of 1,000 k kWW Diesel Power Plants to Diesel Power Plants to

support the demand in this areasupport the demand in this area

:- Power Demand in the future will increase at the rate of 6-8 % :- Power Demand in the future will increase at the rate of 6-8 %

per year.per year.

:- In 1998/1999 the Japan International Cooperation Agency :- In 1998/1999 the Japan International Cooperation Agency (JICA) provided EGAT with their experts to process the(JICA) provided EGAT with their experts to process the FSFS of PV Power in Mae Hong Son province.of PV Power in Mae Hong Son province.

::- - As a result of all above, EGAT’s plan to build PV power plantsAs a result of all above, EGAT’s plan to build PV power plants of 500 of 500 kW and 1kW and 1.75 .75 MMW in Muang District (1st Phase).W in Muang District (1st Phase).

Outline of Power Outline of Power DemandDemand

Mae Sa Nga Dam

Mok Cham PaeMae Hong Son

EGAT diesel power plantPha Bong DamPEA diesel power plant

Mae Sa Riang

Mae Yuam

PEA diesel power plant

Mae Rim

Mae Taeng

Chom Thong

HodOm Koi

Pang Ma Pha

Pai

Myanmar

Chiang MaiCMB

CMA

22 kV line, 150 km.3MW

22 kV line (DEDP) 130 km.5 MW

22 kV line (PEA) 150 km.1 MW

Pai 500 kW.

Khun Yuam 250 kW.

Mae Hong Son 1 1,750 kW.

Mae Hong Son 2 500 kW.

Mae Sa Riang 1,000 kW.

Mae La Luang

Mae La Noi

Khun Yuam

Pang Ma Pha 750 kW.

Province

District

Village

Diesel power plant

22 kV distribution line

Dam

N

Mae Hong Son Distribution Line

Map

Power Plant in Mae Hong Son AreaPower Plant in Mae Hong Son Area

Existing Power Supply and DemandExisting Power Supply and Demand

Zone A :- Hydro Plant 4,700 kWp. Zone A :- Hydro Plant 4,700 kWp. 6.386.38 MW. MW. 3. 3.8383 MW. MW. Diesel Plant 5,400 kWp.Diesel Plant 5,400 kWp.

Zone B :- Hydro Plant 1,500 kWp. Zone B :- Hydro Plant 1,500 kWp. 5.475.47 MW. MW. 2. 2.84 84 MW. MW. Diesel Plant 2,700 kWp.Diesel Plant 2,700 kWp.

22 kV line22 kV line

Zone C :- Hydro Plant 2,100 kWp. Zone C :- Hydro Plant 2,100 kWp. 2.2.7777 MW. MW. 1. 1.665 MW. 5 MW. 22 kV line22 kV line

Demand Peak Off Peak

The Site and Capacity of PV Power PlantThe Site and Capacity of PV Power Plant in Mae Hong Son in Mae Hong Son

Zone A :- Mae Hong Son-1 Capacity 1,750 kWp. Zone A :- Mae Hong Son-1 Capacity 1,750 kWp. Mae Hong Son-2 Capacity 500 kWp.Mae Hong Son-2 Capacity 500 kWp.

Zone B :- Mae Sariang Capacity 1,000 kWp. Zone B :- Mae Sariang Capacity 1,000 kWp. Khun Yuam Capacity 250 kWp.Khun Yuam Capacity 250 kWp.

Zone C :- Pang Ma Pha Capacity 250 kWp. Zone C :- Pang Ma Pha Capacity 250 kWp. Khun Yuam Capacity 500 kWp.Khun Yuam Capacity 500 kWp.

500 kW PV Power Station in Mae Hong Son -2500 kW PV Power Station in Mae Hong Son -2500 kW PV Power Station in Mae Hong Son -2500 kW PV Power Station in Mae Hong Son -2

Solar Cell ASE-300-DG-FT ModuleSolar Cell ASE-300-DG-FT Module

Power (max.)Power (max.) 300 300 WpWp xx 1680 1680ModulesModules

Wiring and Data CollectionWiring and Data Collection

Electrical Electrical Control RoomControl Room

Electrical Room Invertors Room

Control Room

Battery RoomBattery Room1,200 AH 560 V1,200 AH 560 V

Power Conditioning UnitsPower Conditioning Units250 kW x 2 sets250 kW x 2 sets

AC BatteryAC Battery200 kW x 2 sets of200 kW x 2 sets of

ConverterConverter

PV Efficiency on DC side (7 April 2004)PV Efficiency on DC side (7 April 2004)

PV Efficiency on AC side (7 April 2004)PV Efficiency on AC side (7 April 2004)

SYSTEMSYSTEMCONTROLLERCONTROLLER

INDOOR TRANSFORMER INDOOR TRANSFORMER630630 kVA kVA

SWITCH GEARSWITCH GEAR22 kV22 kV

INVERTERINVERTER 2255 0 kVA x 0 kVA x22

SYSTEM MONITORSYSTEM MONITORCONTROLLER ANDCONTROLLER ANDDATA ACQUISITIONDATA ACQUISITION

BATTERY BANK BATTERY BANK 560900 560900 AAhh

PV ARRAY PV ARRAY505044 kk k kk k500500 kWp PV POWER PLANT kWp PV POWER PLANT

DIAGRAM DIAGRAM

- kk450700- kk450700

cc

PEA GRID SYSYEMPEA GRID SYSYEM22 kV 322 kV 3 YY

400400 3Vac 3Vac DD22 kV22 kV

INVERTERINVERTER 2200 0 kVA x 0 kVA x22

EPPO = 3.831 MUS$= 86.75 %

EGAT = 0.585 MUS$ = 13.25 %

Total CostTotal Cost == 4.416 4.416 MUS$MUS$== 100.00100.00 %%

System System CostCost

The investmant cost of 500 kW. PV power plant arefrom EGAT own budget (13.25%) and

from Energy Conservation Promotion Fund, Energy Planning and Policy Office (86.75%).

SystemSystem OperationOperation

1. Sunlight incident on PV modulesSunlight incident on PV modules

Solar EnergySolar Energy --> --> DCDC current -->current --> ControllerController

--> --> Inverter Inverter (with MPPT)(with MPPT)

2.2. I Inverter nverter changechange DC current DC current --> AC current --> AC current -->-->

TransformerTransformer --> --> Switch Gear Switch Gear -->--> PEAPEA

3. Short time of3. Short time of clouding periodclouding period --> --> capacity will decrease so capacity will decrease so

that electricity from batteries will be addedthat electricity from batteries will be added

4.4. PV power plantPV power plant will generate will generate iinn daytime. daytime.

After that,After that, Mae Sa Nga power plantMae Sa Nga power plant will will savesave water which water which

stored stored iinn daytime to produce electricity during evening peak.daytime to produce electricity during evening peak.

BenefitBenefit of MHS Project of MHS Project

Energy ReservationEnergy Reservation

Environmental ReservationEnvironmental Reservation

- Generation from PV- Generation from PV : 700,000 kWh/year- D- Decrease in diesel oilecrease in diesel oil : 215,385 Litre/year

- Source ofSource of energy from the sun is a clean energy energy from the sun is a clean energy

- Decrease in burning of diesel oil and Decrease in burning of diesel oil and

- Reduce greenhouse gas Reduce greenhouse gas (CO(CO22) : 520.10 ) : 520.10

Ton/yearTon/year

CONCLUSIONCONCLUSION

Most PV projects in Thailand are independently conducted by government organizations which depend on their functional responsibilities

PV technology for grid support is important in remote applications.

If the PV price continues to drop, PV’s efficiency increases and the energy situation, environmental impact cause more concern, the widespread use of PV Power Plant may become feasible by the next decade.