View
482
Download
4
Embed Size (px)
DESCRIPTION
Citation preview
Paer Id : 142EFFECT OF HORIZONTAL WIND SHEAR ON FLICKER
EMISSION SEVERITY IN WIND FARM.
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
1
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR
ON FLICKER IN WIND FARM2
Continuity of service
Variation in voltage magnitude.
Short duration variation. Instantaneous interruption, sag, swell. Momentary interruption, sag, swell. Temporary interruption, sag, swell.
Long duration variation. Interruption. Under Voltage. Overvoltage.Transient voltages and currents.
Voltage unbalance.Waveform distortion. DC offset. Harmonics. Inter-harmonics. Notching. Noise.Flicker or voltage fluctuations.Power frequency variations.Power failure or blackout.
Power Quality Parameters associated with wind energy …..
3
Input parameters.Type of generator used for the wind turbine.Squirrel cage induction generator (SQIG). Slip ring induction generator (SRIG).Doubly fed induction generator (DFIG). Permanent magnet synchronous generator (PMSG). DC generator.Type of the turbine according to the axis of rotation. - Horizontal axis. Vertical axis.Horizontal axis - Up-Wind Turbines Down-Wind Turbines Shrouded Wind TurbinesVertical axis wind turbines.1.Windmill With Rotational Sails ( VAWT ) 2.Neo-Aerodynamic ( VAWT )3. Darrieus Wind Turbine ( VAWT ) 4. Giromill ( VAWT )5. Savonius Wind ( VAWT ) continuous and split blade 6. Windstar Turbines ( VAWT )7. Giromill Wind Turbine( VAWT ) 8. Flapping Panel Wind Turbine( VAWT )9. The Persian windmill 10. A cup anemometer is a drag-type vertical axis wind turbineNumber of blades of the turbine rotor. One. Two. Three. Six.Types of blades and Length of bladesType of turbine according to location of blades - Upwind turbine Downwind turbine.Materials of the bladeswood - sensitivity to moisture, high processing costs, low density, low stiffnessglass fiber reinforced plastic (GFRP) - moderate stiffness, high strength, and moderate density.carbon fiber reinforced plastic (CFRP) - very high stiffness, high strength, light weight& low density.Aramid fibers - excellent environmental and thermal stability, static and dynamic fatigue resistance steel aluminum - density about a third that of steel, lightweight, weaker and less stiff than steel.nickel alloy steels- good corrosion and oxidation resistance.Types of tower - Steel tubular tower , Lattice tower, Guy wire tower and Height of Tower Speed of the wind 5 m/s. 10m/s. 15m/s 20m/s 25m/sType of load. - Resistive. Inductive. Capacitive.
INFLUENCE OF HORIZONTAL WIND SHEAR ON FLICKER EMISSION SEVERITY IN WIND FARM.
Friday, April 7, 2023
Indian Institute of technology Bombay conference presentation
4
Horizontal wind shear
Friday, April 7, 2023Indian Institute of technology Bombay
conference presentation 5
Horizontal wind shear is a micro scale
meteorological phenomenon, in which there is a swift,
sweeping alteration or disparity in the wind speed,
across the rotor disc, over a comparatively petite
horizontal distance, in the atmosphere in a squat span
of time
Parameters stirring flicker emission severity
Friday, April 7, 2023Indian Institute of technology Bombay
conference presentation 6
Short circuit capacity ratio
Type of load
Blade pitching
Dynamics of generator and grid
Grid or network impedance phase angle Wind turbine type or characteristics.
Parameters stirring flicker
emission severity
Horizontal wind shear
Tower shadow effect
Wind parameters Grid parameters . Turbine parameters
Mean wind speed
Vertical wind shear Vshr,
Tower wake effect
Wind turbulence intensity
Origins of horizontal wind shear.
Friday, April 7, 2023Indian Institute of technology Bombay
conference presentation 7
Shallow lows
Low level temperature inversion
Sea breeze Turbulent air
Strong surface winds.
Thunderstorms
Microbursts
Frontal surfaces
Convective storms
Mountain waves
Origins of horizontal
wind shear. Jet streams
Snow showers
Flicker
Friday, April 7, 2023Indian Institute of technology Bombay
conference presentation 8
Tao sun et al. , defined flicker as an imprint of unsteadiness
of visual sensation, induced by a light stimulus, whose
luminance or spectral distribution fluctuates with time, which
can cause clientele’s exasperation.
Flicker is also defined as the measure of voltage deviation,
which may cause brouhaha to consumer.
A typical 600 kW wind turbine has a rotor diameter of 43-44 meters, i.e. a rotor area of some 1,500 square meters.
The rotor area determines how much energy a wind turbine is able to harvest from the wind.
Since the rotor area increases with the square of the rotor diameter, a turbine which is twice as large will receive 22 = 2 x 2 = four times as much energy.
To be considered a good location for wind energy, an area needs to have average annual wind speeds of at least 12 miles per hour.
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR
ON FLICKER IN WIND FARM10
Disturbance to photosensitive person.Light flicker and malfunction of electrical equipment and devices.Affect the production environment. Lower work concentration levels.Detrimental effect on electrical and electronic equipment. Nuisance tripping due to mis-operation of relays and contactors. Unwanted triggering of UPS units to switch to battery mode.Affect industrial processes relying on constant electrical power
Effect of Flickers…..
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR
ON FLICKER IN WIND FARM11
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR
ON FLICKER IN WIND FARM12
Vertical Wind Shear
Ground
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR
ON FLICKER IN WIND FARM13
Horizontal Wind Shear Horizontal Wind Shear
Wind currents from top view
╞Wind turbine
Type of Wind shear
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR
ON FLICKER IN WIND FARM14
Wind shear per second
Type of wind shear
0-3 Weak
4-5 Moderate
6-7 Large
Above 8 Extreme
ESTIMATION OF SHORT TERMFLICKER ( PST) AND LONG TERM FLICKER (PLT) BY POWER QUALITY TEST.
Friday, April 7, 2023 EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM 15
POWER QUALITY TESTS OF WIND TURBINES EXPRESS FLICKER
COEFFICIENT.
FOR EACH WIND TURBINE.
FOR DIFFERENT NETWORK PHASE ANGLE CONDITIONS.
FOR DIFFERENT ANNUAL MEAN WIND SPEEDS
FOR A WIND FARM.
15
SHORT-TERM FLICKER EMISSION ( PST ) AND LONG TERM FLICKER EMMISSION (PLT) ARE ASSUMED SAME
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
1616
PST AND PLT ARE ASSUMED SAME
BECAUSE IT IS ASSUMED THAT MEAN
WIND SPEED AND TURBULENCE WILL BE
SAME IN 10 MINUTES AND IN 120 MINUTES.
SHORT-TERM FLICKER EMISSION ( PST ) AND LONG TERM FLICKER EMMISSION (PLT)
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
1717
Wind parameters affecting flicker
Grid parameters affecting flicker
Turbine parameters affecting flicker
Deterministic parameters -Mean wind speed / wind speed variation.
Short circuit capacity ratio (SCR).
Blade pitching.
Wind shear or gradient. (horizontal and vertical wind shear)., Tower shadow effect, tower wake effect.
Grid / network impedance angle.
Physical dynamics of wind turbine
Stochastic parameters - Wind turbulence intensity.
Electrical dynamics of generator and grid , type of load
Wind turbine type / characteristics.
Wind tunnel for testing
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR
ON FLICKER IN WIND FARM18
WORK DONE - DEVELOPMENT OF MATHRMATICAL MODEL FOR FLICKER EMMISSION
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
1919
SHORT-TERM FLICKER EMISSION ( PST ) AND LONG TERM FLICKER EMMISSION (PLT)
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
2020
SK --- SHORT CIRCUIT CAPACITY.
Ci ------ FLICKER COEFFICIENT OF WIND TURBINE i.
(ΨK) ----- SPECIFIC NETWORK IMPEDANCE PHASE ANGLE.
Va ----- ANNUAL AVERAGE WIND SPEED FROM SITE.
Sn,i ---- RATED POWER OF WIND TURBINE i.
Nwt ---- NUMBER OF WIND TURBINES IN WIND FARM.
SHORT-TERM FLICKER EMISSION ( PST ) AND LONG TERM FLICKER EMMISSION (PLT)
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
2121
SK --- SHORT CIRCUIT CAPACITY.
Ci ------ FLICKER COEFFICIENT OF WIND TURBINE i.
(ΨK) ----- SPECIFIC NETWORK IMPEDANCE PHASE ANGLE.
Va ----- ANNUAL AVERAGE WIND SPEED FROM SITE.
Sn,i ---- RATED POWER OF WIND TURBINE i.
Nwt ---- NUMBER OF WIND TURBINES IN WIND FARM.
SHORT-TERM FLICKER EMISSION ( PST ) AND LONG TERM FLICKER EMMISSION (PLT)
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
2222
SK --- SHORT CIRCUIT CAPACITY.
Ci ------ FLICKER COEFFICIENT OF WIND TURBINE i.
(ΨK) ----- SPECIFIC NETWORK IMPEDANCE PHASE ANGLE.
Va ----- ANNUAL AVERAGE WIND SPEED FROM SITE.
Sn,i ---- RATED POWER OF WIND TURBINE i.
Nwt ---- NUMBER OF WIND TURBINES IN WIND FARM.
SHORT-TERM FLICKER
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
2323
0
0.02
0.04
0.06
0.08
0.1
0 5 10 15 20 25 30Short term flicker ( pst ) Poly. (Short term flicker ( pst ))
Mean wind speed V ( m/s )
Shor
t ter
m fl
icker
( P
st)
Proposed Model
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR
ON FLICKER IN WIND FARM24
Abbreviation Parameter
N Number of blades
Nsd Product of number of turbine blades and multiplying factor
Pst Short term flicker emission severity (%)
Rbt Ratio of twice turbine blade length to tower height.
Hshr Horizontal wind shear ( per second )
Assumptions in Model The tower is a tubular type of tower as for larger turbines
lattice tower is not favored. Wind turbine considered is of large size ranging from 1 MW to 7 MW.
Wind speed variation is in between cut in and cut out speed. Normally cut in speed is 3 m/s, cut out speed is 25 m/s and rated speed is 11 m/s.
Turbine is upwind turbine fixed speed turbine . Majority of the turbines are upwind turbines and downwind turbines are rarely incorporated.
Temperature is 25 deg. C. The experiment conducted is a t 25 deg. C..
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR
ON FLICKER IN WIND FARM25
Variation of flicker due to Horizontal wind shear
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR
ON FLICKER IN WIND FARM26
Hor
Flicker by empirical model for hilly topography and turbine with 2 blades Site Saswad ( India)
Flicker by empirical model for flat topography with grass and turbine with 2 blades Site : - Nimgaon Mhalungi ( India)
Flicker by empirical model for city region and turbine with 3 blades Site : - Lohagaon ( India)
Recorded flicker at hilly topography and turbine with 2 blades Site :- Saswad ( India)
Recorded flicker at flat topography with grass and turbine with 2 blades Site :- Nimgaon Mhalungi ( India)
Recorded flicker at city region and turbine with 3 blades Site : - Lohagaon ( India)
ConclusionConclusionFLICKER IS NOT A LINEAR SUM OF ALL FLICKERS.
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
27
EQUATION TAKES INTO ACCOUNT THE “CANCELLATION” EFFECTS,
WHICH COMES FROM WIND DYNAMICS IN WIND FARM THAT IS NOT
CORRELATED, SO FLICKER IS NOT A LINEAR SUM OF ALL FLICKER
PRODUCED FROM EACH WIND TURBINE.
BECAUSE 3P IS MAIN FLICKER CONTRIBUTION AND THESE
RELATIVELY HIGH FREQUENCIES ARE APPROXIMATELY
UNCORRELATED. 27
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR
ON FLICKER IN WIND FARM28
Reactive power compensation equipment and energy storage equipment.
The Static VAR Compensator (SVC).
Static compensator (STATCOM).
Unified Power Flow Controller (UPFC).
Mitigations Methods of Flicker elimination Power System
References Pedro Rosas, “Dynamic influences of wind power on the power system”, Ph.D. Dissertation, Section of Electric Power Engineering, Orsted Institute, Technical University of Denmark,. Mar. 2003.
IEC 61400-21, Measurement and assessment of power quality characteristics of grid connected wind turbines, International Electrotechnical Commission, 2001
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR
ON FLICKER IN WIND FARM29
THANK YOU.
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
3030
LARGE-SCALE INTEGRATION.
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
31
LARGE-SCALE INTEGRATION MEANS RELATIVELY
HIGH WIND POWER COMPARED TO LOCAL POWER
SYSTEM (ABOVE 10 % ).
LARGE-SCALE INTEGRATION PROBLEMS ARE
BASED ON SMALL-SCALE ONES.
31
TYPES OF LARGE-SCALE INTEGRATION.
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
32
LARGE WIND FARMS CONNECTED TO
TRANSMISSION SYSTEM .
SEVERAL SMALL WIND FARMS CONNECTED
TO DISTRIBUTION SYSTEMS.
32
POWER QUALITY AND STABILITY ASSESSMENT IN LARGE-SCALE INTEGRATION OF WIND ENERGY.
Friday, April 7, 2023EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
33
DEPENDING ON SIZES, THEY DEMAND SPECIAL
INVESTIGATIONS OF VOLTAGE AND FREQUENCY VARIATIONS
FOR ASSESSMENT OF VOLTAGE STABILITY AND POWER
QUALITY.
IN SMALL-SCALE INTEGRATION, FREQUENCY IS ASSUMED
CONSTANT. 33
EFFECTS OF LARGE-SCALE INTEGRATION.
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
34
WITH HIGH WIND POWER CAPACITY INSTALLED, LARGE ACTIVE
POWER VARIATIONS CAN INTERACT WITH FREQUENCY CONTROLLERS
IN THE CONVENTIONAL POWER STATIONS, SO FREQUENCY
VARIATIONS CAN OCCUR.
IN ADDITION, LARGE REACTIVE POWER DEMANDED BY WIND FARMS
CAN REDUCE REACTIVE POWER SUPPLY.
HENCE VOLTAGE STABILITY LIMITS CAN BE REDUCED.
34
FOCUS- VOLTAGE STABILITY AND DYNAMIC POWER OSCILLATION.
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
35
HERE FOCUS IS ON VOLTAGE STABILITY
AND
DYNAMIC POWER OSCILLATIONS DURING
NORMAL OPERATION OF POWER SYSTEM.
35
SINGLE LINE DIAGRAM OF BASIC STRUCTURE OF POWER SYSTEM.
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
3636
EFFECTR OF MEAN WIND SPEED ON FLICKER FOR FIXED WIND TURBINES .
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
37
IN FIXED SPEED WIND TURBINE FLICKER
INCREASES WITH INCREAING WIND SPEED
FLICKER LEVEL INCREASES THREE TIMES
FROM LOWER TO HIGHER WIND SPEEDS.
37
EFFECT WIND SPEED VARIATION ON POWER
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
38
VARIATION IN WIND SPEED OF +/- 1 % GIVE
POWER FLUCTUATION OF +/-20 %
38
FLICKER FOR FIXED AND VARIABLE SPEED WIND TURBINE
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
39
FLICKER IN FIXED SPEED WIND TURBINE IS
MORE FLICKER THAN FOR VARIABLE SPEED
WIND TURBINE.
39
EFFECT OF GRID IMPEDANCE ANGLE ON FLICKER FOR FIXED WIND TURBINE
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
40
FLICKER IN FIXED SPEED IS MORE SENSITIVE TO
GRID ANGLE THAN FOR VARIABLE SPEED
FOR FIXED SPEED WIND TURBINE FLICKER IS MORE
FOR HIGH GRID ANGLES THAN FOR VARIABLE SPEED
VARIABLE SPEED WIND TURBINE
40
ACCEPTABLE FLICKER FOR TRANSMISION NETWORK
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
41
FOR WIND TURBINES CONNECTED TO
TRANSMISSION NETWORK THE FLICKER
CONTRIBUTION FROM WIND TURBINE SHALL BE
LIMITED TO Pst = 0.3 AND BELOW.
41
ACCEPTABLE FLICKER FOR DISTRIBUTION NETWORK
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
42
FOR WIND TURBINES CONNECTED TO
TRANSMISSION NETWORK THE FLICKER
CONTRIBUTION FROM WIND TURBINE SHALL BE
LIMITED TO Pst = 0.35 AND BELOW.
42
WAYS OF ANALYSIS OF FLICKER
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
43
CUMULATIVE PROBABILITY P(l) FUNCTION OF
INSTANTANEOUS FLICKER LEVEL.
SHORT TERM FLICKER SEVERITY VALUE / LONG
TERM FLICKER SEVERITY VALUE.
43
WHY SHORT TERM AND LONG TERM FLICKER AR SAME
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
44
FLICKER IS A FUNCTION OF WIND SPEED.
LOND TERM FLICKER IS MEASURED FOR 2 HOURS I.E. FOR 120
MINUTES.
SHORT TERM FLICKER IS MEASURED FOR 10 MINUTES.
CALCULATIONS OF 12 CONTINUOUS SHORT TERM FLICKER
VALUE IS VERY CLOSE IN 2 HOURS.
SO PLT AND PST ARE SAME
44
INNOVATION IN WORK DONE
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
45
FOR FINDING FLICKER FOLLOWING NEW PARAMETER is INTRODUCED
VERTICAL WIND SHEAR/ HORIZONTAL WIND SHEAR.
FLICKER IS ONE OF THE WAY TO EVALUATE THE DYNAMIC PERFORMANCE OF
WIND TURBINE.
45
FLICKER VARIATION WITH MEAN WIND SPEED
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
4646
FLICKER VARIATION WITH TURBULENCE INTENSITY
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
4747
FLICKER VARIATION WITH SHORT CIRCUIT CAPACITY.
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
4848
FLICKER VARIATION WITH GRID IMPEDANCE ANGLE.
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
4949
FLICKER VARIATION TURBULENCE INTENSITY
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
5050
THANK YOU.
Friday, April 7, 2023
EFFECT OF VERTICAL WIND SHEAR ON FLICKER IN WIND FARM
5151