Control system and design and transient analysis of a grid integrated wind turbine
Wind power is one of the most reliable and developed renewable energy source. The share of wind power with respect to total installed power capacity is increasing worldwide. It is now more significant that the researchers focus more on technical improvements of wind energy conversion system. A va...
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| Format: | Thesis |
| Language: | English |
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| Online Access: | http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/59929/1/p.1-24..pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/59929/2/Full%20Text.pdf |
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| Summary: | Wind power is one of the most reliable and developed renewable energy source. The
share of wind power with respect to total installed power capacity is increasing
worldwide. It is now more significant that the researchers focus more on technical
improvements of wind energy conversion system. A variable speed wind turbine
typically uses a maximum power tracking algorithm in order to optimize energy
acquisition from wind. Although many algorithms has been introduced by the
researchers in the past, to enhance the power extraction capability but they all fall short
when it comes to computational simplicity and convergence time. In this thesis, a new
maximum power point tracking algorithm for wind energy conversion systems has been
proposed to get rid of these problems. The algorithm is based on the optimum
relationship between active power and dc link voltage. The dc power is calculated from
voltage and current, which are read by the algorithm. The conventional perturbation
approach has been modified by introducing a new perturbing parameter to reduce
computational time and system complexity. The proposed system also include a Fuzzy-
PI pitch angle controller in order to analyze the output power characteristic of wind
generator from cut-in wind speed to rated wind speed. A detail electromechanical
model of a wind turbine with variable speed and variable pitch control is developed in
Matlab/Simulink environment in order to analyze the performance of the proposed
control system. The proposed model is also compared with conventional system and the
comparison results show that the proposed system increases power absorption by five to
seven percent. This research also investigates the transient stability of the hybrid power
system with increased penetration level of wind turbine in order to find out the fault
current behaviour of a grid integrated wind generator. With increasing penetration of
wind power, the power system dominated by synchronous machines experience a
change in dynamics and operational characteristics. Given this assertion, a systematic
approach has been developed to analyze the impact of increased penetration on transient
stability of a large power system. The primary basis of the method is to replace the
induction generators with equivalent conventional round rotor synchronous wind
generators. In this regard, the modes that are both detrimentally and beneficially
affected by fault current have been identified. The results for transient stability analysis
show that inducing synchronous wind generator increases transient stability of a system.
This research work resulted in a new way to maximize energy extraction from wind. It
also identifies the effect of wind generators on grid stability. Discussions of the
obtained results were made and several factors were listed. These findings helped in
proposing useful modifications for the system in order to enhance its performance. |
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