International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
CONTROLLING FLICKER CAUSED DUE TO POWER FLUCTUATIONS BY USING INDIVIDUAL PITCH CONTROL FOR A VARIABLE SPEED DFIG BASED WIND TURBINE M.AMULYA SRUTHI1, C. Prashanth Sai2, Dr. M. Vijaya Kumar3 1 PG
Student, Department of EEE, JNTUCE Anantapur, Andhra Pradesh, India.
2 Lecturer,
Department of EEE, JNTUCE Anantapur, Andhra Pradesh, India.
3 Professor,
Department of EEE, JNTUCE Anantapur, Andhra Pradesh, India. ---------------------------------------------------------------------***--------------------------------------------------------------------grid. Grid-connected variable velocity wind turbines are Abstract – Energy demands of the world are enormously increasing. In this scenario the non renewable sources play an important role in meeting the energy needs. Wind energy have a lot of potential for generating large amounts of energy with zero input cost and no by products. Therefore it is very important to maintain the power quality while generating the power through wind turbine. In this paper IPC control scheme is proposed a new scheme to reduce the power fluctuations which are responsible for reduction of the generated power quality. This scheme is applicable to MW – level DFIG based variable speed wind turbine.IPC scheme uses the active power generated and azimuth angle of blade as reference for reduction of flicker.IPC along with FLC reduces the oscillates in active power generated to a great extent. The proposed scheme is designed and implemented in MATLAB/Simulink.
fluctuating force sources Throughout constant operation. The force variances created by wind pace variation, wind shear, tower shadow, yaw errors, and so on. , prompt those voltage variances in the network, which might transform flicker. Separated from the wind control wellspring conditions, the control framework aspects likewise bring effect on flicker emanation about gridconnected wind turbines, for example, such that impede ability Furthermore grid impedance point. The flicker emanation for diverse sorts for wind turbines will be exactly different. In spite of variable-speed wind turbines are better regarding the flicker emission than fixed-speed wind turbines, with the large increase of wind power penetration level, the flicker study on variable speed wind turbines becomes necessary and imperative.
Key Words: Flicker, flicker mitigation, individual pitch control (IPC), variable speed turbine, collective pitch control(CPC), fuzzy logic controller(FLC)
Previously there are number of ways to reduce the flicker in power generated. These are implemented by using reactive compensation. When the grid has a very low impendence angle ie 100 these techniques will be redundant. For a large distributive networks the reactive power needed for compensation will be as greater as 3.26pu which is practically not possible to generate from STATCOM especially when DFIG is present in the system. Another way by controlling the active power by varying the DC link capacitance can be used for reducing flicker but this requires a large capacitance which is of high cost and reduces the life of capacitor in storing the energy. Pitch actuating system can also be used for mitigation of flicker but time delay and pitch rate great affects the system. This affect is considerably large in case of variable speed turbines.
1. INTRODUCTION Presently the reality vitality interest may be expanding because of number development and up to date modern culture persuading a considerable measure of ventures done elective vitality wellsprings for example, Solar, Wind, bio-mass, energy units etc; "around the renewable vitality sources, wind vitality reliably demonstrates its great possibility to serve Similarly as clean What's more boundless vitality wellspring. For the increment about wind control infiltration under the grid, the energy caliber gets to be a critical issue. You quit offering on that one essential part from claiming force nature may be flicker since it might turn into a restricting component for coordination wind turbines under feeble grids, Furthermore actually under generally solid grids assuming that the wind force infiltration levels are secondary. Flicker is characterized as “an feeling of precariousness for visual sensation prompted Toward a light stimulus, whose luminance or ghastly conveyance oscillates with time”. Flicker may be prompted toward voltage fluctuations, which need aid initiated by load stream transforms in the © 2017, IRJET
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Impact Factor value: 5.181
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As a result of above mentioned drawbacks of existing solutions there is a need to find an alternative solution for power fluctuation mitigation. A novel scheme used in helicopter industry for load reduction is applied to wind turbine. That is pitching the blades individually as per the wind speed and direction of wind flow.IPC is a promising solution for reducing power oscillation in active power generation in case of distributive network systems. ISO 9001:2008 Certified Journal
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