hydro power 21 oct 2010 monterey institute for international studies
DESCRIPTION
Hydro Power 21 Oct 2010 Monterey Institute for International Studies. Chris Greacen [email protected]. Outline. Microhydro Solar , wind, hydro – brief comparison Hydro system overview Some examples from Thailand and elsewhere Site assessment Head Flow Penstock length - PowerPoint PPT PresentationTRANSCRIPT
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OutlineMicrohydro• Solar, wind, hydro – brief comparison• Hydro system overview• Some examples from Thailand and elsewhere• Site assessment
– Head– Flow– Penstock length– Transmission line length
• Civil works• Mechanical• ElectricalLarge Hydro• The good, the bad, and the ugly…
Two Lao Hydro stories: NT2 and pico-power
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Sun, Wind, & Water
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Micro-hydropower overview
Source: Inversin, A. R. (1986). Micro-Hydropower Sourcebook.
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Mae Kam Pong, Chiang MaiDEDE + community40 kW$130,000 costSell electricity to PEA – $13,000 per year
Thai Potential:1000s of projects - 700 MW (?)
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Huai Krating, TakPower: 3 kWHead: 35 meterFlow: 20 liters/secondCost: <$6,000
(turbine - $700 baht)
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Kre Khi village, Tak Province1 kW for school, clinic, churchCost: <$3,500
(turbine $250)Head: 10 metersFlow: 15 lit/sec
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Mae Klang Luang, Chaing Mai200 watts$120 (turbine: $90)Installed: 2007Head: 1.7 meters
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Micro-hydroelectricity: Estimating the energy available
Image Source: Inversin, A. R. (1986). Micro-Hydropower Sourcebook.
heightPower = 5 x height x flow
Watts meters liters per second
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Measuring height drop (head)
• Site level• Pressure gauge
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Sigh
t lev
el m
etho
d
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Hose & Pressure Gauge• Accurate and simple method.• Bubbles in hose cause errors.• Gauge must have suitable scale and be calibrated.• Use hose a measuring tape for penstock length.• Feet head = PSI x 2.31
H1
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Measuring Flow
• Bucket Method• Float Methoddesign flow = 50% of dry-season flow
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Bucket Method
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Float Method
Flow = area x average stream velocity
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Image source: Inversin, A. R. (1986). Micro-Hydropower Sourcebook.
Civil Works – some golden rules
• Think floods, landslides
• Think dry-season.• Try to remove
sediment• Maximize head,
minimize penstock– “wire is cheaper than
pipe”
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Source: Inversin, A. R. (1986). Micro-Hydropower Sourcebook.
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Weir
A Sluice allows sediment removal.
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Locating the Weir & Intake
Weir
Intake
Head Race
Trash RackSilt Basin
Penstock
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Intake directly to penstock
• If spring run-off sediment is not severe, the penstock may lead directly from the weir.
Weir
Penstock
Screened Intake
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Side intake
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Trash rack: keeps the big stuff out
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Screens
• Screen mesh-size should be half the nozzle diameter.• A self-cleaning screen design is best.• The screen area must be relatively large.
Screen
PenstockHead Race
Silt Basin
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Source: Inversin, A. R. (1986). Micro-Hydropower Sourcebook.
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Power Canal (Head Race)
• It may be less expensive to run low pressure pipe or a channel to a short penstock.
4” Penstock
6” Penstock
Head Race
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Forebay (Silt basin)• Located before penstock• Large cross-sectional area, volume Water velocity reduced
sediment (heavier than water but easily entrained in flow) has opportunity to drop out.
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Source: Inversin, A. R. (1986). Micro-Hydropower Sourcebook.
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Penstocks• A vent prevents vacuum collapse of the penstock.• Valves that close slowly prevent water hammer.• Anchor block – prevents penstock from moving
Penstock
Valve
Vent
Pressure GaugeValve
Anchor Block
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Penstock diameter
Hazen-Williams friction loss equation:
headloss friction (meters) =(10.674*(F/1000)^1.85)/(CoefFlow^1.85*D^4.87)*L
Where:F = flow (liters/sec)CoefFlow = 150 for PVCD = penstock diameter (mm)
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Penstock materials
• Poly vinyl chloride (PVC)• Polyethylene (PE)• Aluminium• Steel
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Anchor and Thrust Blocks
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Source: Inversin, A. R. (1986). Micro-Hydropower Sourcebook.
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Locating the Powerhouse• Power house must be above flood height.• Locate powerhouse on inside of stream bends.• Use natural features for protection.
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Micro-hydro technology
Pelton Turgo Crossflow Kaplan Centrifugal pump
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Turbine application
http://www.tycoflowcontrol.com.au/pumping/welcome_to_pumping_and_irrigation/home4/hydro_turbines/turbine_selection (April 18, 2003)
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Efficiency and Flow
0.2 0.80.60.4 1.0Fraction of Maximum Flow
Effi
cien
cy
50%
00%
100%Pelton and Turgo
Crossflow
Francis
Propeller
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(break?)Generators
• Permanent magnet• Wound rotor synchronous• Induction (Asynchronous)
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Permanent Magnet Generator• Rotor has permanent magnets• Advantages
– No brushes– Efficient
• Disadvantages– Generally limited in size to several kW
• Some do AC• Some do AC and rectify to DC
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Adjustable permanent magnet generator
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DC Alternator (automotive)• Readily available.• Easy to service.• Brushes need replacing.• A rheostat controls
excitation.
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• Used in many all stand-alone applications.• Single phase up to 10 kW.• 3-phase up to >100,000 kW • Advantage:
– Industrial standard– Frequency and voltage regulation
• Disadvantage– Wound rotor – not tolerant to overspeed– Harder to connect to grid
(wound rotor) Synchronous Generator
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(wound rotor) Synchronous Generator• Most large machines use field coils to
generate the magnetic field.• Rotating magnetic field induces alternating
current in stator windings.
AVR
Rotor Field WindingExciter Winding
Exciter Field WindingStator Output WindingRectifier
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(wound rotor) synchronous generator
Big50,000,000 watts
small2,000 watts
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Asynchronous (Induction) Generator
• Just an induction motor with negative slip.• Used with:
– grid-tie system (up to 1 MW)– Off-grid stand-alone (often in ‘C-2C’ configuration)– Can be used with battery based systems
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Induction motor/generator
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Induction Generator
• Advantages– Simple and robust.– Tolerant to overspeed– Readily available– inexpensive
• Disadvantages– Frequency regulation ‘loose’ in stand-alone applications– Requires external excitation
• When used in off-grid,an electronic load controller (ELC) controls voltage
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Single-phase 230 volt power to the resort grid
Fused cutout, 230 volt
Volt-meter (0-500 volt)
flow switch (open-circuit when no-flow) HFS-25
LN
X
Indicator lamp
V
Single-phase 230 vac 50 Hz kWh meter
AC Ammeter (0 to 5 Amp)
A
Wires from electrical panel to pump 5.5 meters
Outflow pipe
Induction generator (mini) grid-tie example
Wires from electrical panel to flow switch 5.5 meters
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Induction grid-tie example1 MW Mae Ya
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15A 10A
ToVillage
TotalCurrent235V
3000W
ELC
BallastCurrent
3kW Ballast Load
380V
Motor Run Capacitors
in Box
6A
4 kVA 380V
C25μF
2C50μF
Huai Krating:‘pump as turbine’ off-grid induction “C-2C”
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Capacitors for external excitation of induction motors: theoretical overview of LC oscillators
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Mae Wei:‘pump as
turbine’ off-grid induction
power lines: single phase 230 vac to village. 2 @ 25 mm Al
Capacitor 70 microfarad
Volt-meter (0-500 volt)V
A Ammeter 15 amp
A
V
Knife switch
Volt-meter (0-500 volt)
Ammeter 15 amp
Leonics controller Ballast load
A Ammeter 15 amp
Three phase 230 vac delta
Powerhouse
SchoolTo village loads…
Capacitor 140 microfarad
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Mae Wei – ‘pump as turbine’ off-grid induction
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RegulationWith batteries
AC direct
Permanent magnet Trace C-40 type, etc.Wire to output of Outback
ELC (voltage)
Synchronous Trace C-40 type Governor (frequency)AVR (voltage)
Induction Trace C-40 typeWire to output of Outback
ELC (voltage)Capacitors for frequency
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Regulation – synchronous generators… typically both voltage and frequency
• Voltage decreases as load current increases.• The Automatic Voltage (AVR) regulator
increases the field excitation to compensate.• Prolonged underspeed can damage an AVR.• Still required with a load controller because
load power factor can change.
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Mechanical Governing
• As load varies, mechanical control keeps frequency constant by varying water flow– Advantage:
• Saves water– Disadvantage:
• Electro-mechanical moving parts• Slower reacting• More expensive
Deflector
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Electronic Governing
• Types1. Phase angle2. Binary controller3. Pulse Width Modulation
• Dump load: – water heating– air heating– lightbulbs (not recommended)
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Applying Common Property Theory to Village Power Systems
Definition of a common pool resource (Oakerson 1992; Ostrom 1994):
• System has limited yields• difficult to exclude individual users from using
too much
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0
5
10
15
20
25
30
8/6/
01 0
:05
8/6/
01 6
:05
8/6/
01 1
2:05
8/6/
01 1
8:05
8/7/
01 0
:05
8/7/
01 6
:05
8/7/
01 1
2:05
8/7/
01 1
8:05
8/8/
01 0
:05
8/8/
01 6
:05
8/8/
01 1
2:05
8/8/
01 1
8:05
Am
ps
0
50
100
150
200
250
300
Volts
Current 1 Current 2 Current 3 Voltage
Mae Kam Pong Microhydro Unit #2 Voltage andCurrent (15 minute intervals) 6 Sept to 8 Sept 2001
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Low evening time voltage:symptom of a common property problem
• Rules governing user behavior should match with the technical characteristics of the system
• kWh Meters are a mismatch for microhdyro
• Should be concerned with kW, not kWh
• Low voltages… kWh meter is a culprit
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5am
7am
9am
11am
1pm
3pm
5pm
7pm
9pm
11pm
S1
0
100
200
300
400
500
600
wat
ts
Circuit breakers: a technical fix for a common property problem X
kWh meter
OKMini-circuitbreakerMini-circuit breaker can encourage peak load reduction
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5:00
6:00
7:00
8:00
9:00
10:0
0
11:0
0
12:0
0
13:0
0
14:0
0
15:0
0
16:0
0
17:0
0
18:0
0
19:0
0
20:0
0
21:0
0
22:0
0
23:0
0
1985
1988
1991
1994
1997
2000
0
1000
2000
3000
4000
5000
6000
7000
Watts
Time of day
Year
Hourly load curve, by year from 1985 to 2000. Graph based on an appliance usage survey of 35 families in Mae Kam Pong village, April
and June 2001.
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Contribution to evening maximum peak demand by appliance, for the years 1985 – 2001.
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001
Wat
ts
otherwater boilerrice cookerironfridgeTVlights
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Large hydro
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Large hydro: the good…– Seasonal energy storage– Fast ramp-up rates
• Great at load following• Stabilizes grid• Supports deployment of
intermittent renewables (wind, etc.)
– Low carbon (usually)– Can be inexpensive– Domestic resource – helps
diversify against fossil fuel (natural gas) price volatility
Gordon Dam, Southwest National Park, Tasmania, Australia Image Source: Noodle Snacks, Wikipedia
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Large hydro: the bad & ugly…
– Environmental issues• Kills fish
– Too Low dissolved O2 (turbine outlet) or too high (spilling over dam), reservoir predation, fish passage blocked
• Submerge land & fragment habitat• Methane (especially in tropical areas)• Low suspended solids => downstream
scouring – Displaces people (40-80 million so far)
– Energy security -- Low output in dry years
Image Source: California Hydropower Reform Coalition
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Large hydro: the bad & ugly…
–Energy security• Low output in dry years• Climate change
– Hotter (less snowpack)– More annual precipitation
variabilityNet Electricity Generation - Uganda
Load Shedding
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Chinese Dams on Mekong River
Manwan Dam on the Lancang River, Yunnan Province, China
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Myanmar
Source: Myanmar Country Report on Progress of Power Development Plans and Transmission Interconnection Projects, Nov 2008. Downloaded from http://www.adb.org/Documents/Events/Mekong/Proceedings/FG7-RPTCC7-Annex3.4-Myanmar-Presentation.pdf
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Greater Mekong Subregion (GMS) Transmission Grid
• promoted by ADB since the early 1990s under the Greater Mekong Subregion Programme
• When resistance is tough in Thailand, GMS grid allows cross-border exports of environmental & social problem
• Socializes transmission costs.
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Nam Theun 2• Received support from
World Bank, Asian Development Bank, European Investment Bank, COFACE, Agence Française de Développement and others in 2005
• Supposed to be a “poverty-reduction” project and help raise the bar for other dams in Laos
• Two decades in the making…
• Sponsors: Electricité de France, EGCO, Ital-Thai, Government of Laos
• Cost = US$1.45 billion
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Nam Theun 2 (1000 MW)• 95% of electricity goes
to Thailand• 6,200 people in Laos
resettled• Endangered species,
elephant habitat to be flooded
• Opened floodgates to Chinese, Vietnamese, Russian, Thai investment with reduced social & environmental safeguards
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A contrast in support...Nam Theun 2 versus pico-hydro in Laos
Vs.
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Pico-hydropower use (installation)
Flat
Mountainous
Influences Seasonalit
y Type of
Installation
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Pico-hydropower use (river)84
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Pico-hydropower use (river) (2)
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Pico-hydropower use (river) (3)
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Pico-hydropower problems Hardware
Lower output than indicated Low efficiency Winding failure Bearing failure
Voltage fluctuations No regulation Burning out of light bulbs Broken devices
Cables Breaking Bare cables
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Financial analysis pico-hydropower (3)
Pico-h
ydro
(Lao
s)
Pico-h
ydro
(Viet
nam)
Commun
ity pi
co-hy
dro
Solar
home s
ystem
Diesel/
petro
l gen
sets
050
100150200250300350
US
Dol
lar
per
hh/y
ear
ESMAP, 2005
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Conclusions technography (1) Important technology for rural
electrification (estimated 60.000 units throughout Laos)
Diversity in uses and geographical contexts
Cheapest source of electricity available(compared to e.g. solar and diesel generators)
Poor people are willing and able to pay for electricity
Dissemination by word of mouth
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Conclusions technography (2) Whole supply chain oriented toward
lowest costs little awareness about quality differences
Unsustainable practices (regulation problems, breaking devices, etc)
No support from government or other organizations Why?
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Political ecology: actors Government (Ministries, institutes) Multilateral organizations (World Bank,
ADB, ...) International NGOs Private sector
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Narratives about pico-hydro Common narrative:
“We do not support pico-hydropower, because ...
Risks Seasonal limitations No increased productivity
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Interpreting actors’ narratives on pico-hydropower (1) Government
Maximizing foreign investment and export revenues
Preference centralized supply of electricity Control over remote rural areas: grid
extension Multilateral organizations
Following line of government Main focus on grid extension Using ‘universally applicable’ solutions
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Interpreting actors’ narratives on pico-hydropower (2) International NGOs
Not many activities on renewable energy Electricity usually not considered one of the
most important basic needs Private sector
Very little private sector activity (outside pico-hydropower and batteries)
Hardly viable: rock-bottom electricity price
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Thank you
… and please bring tools for Saturday hands-on PV workshopblender (!)wrenches
pliersscrew driversleatherman
For more information, please contact [email protected]
This presentation available at:www.palangthai.org/docs