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Approximated Simplest Fuzzy Logic Controlled Shunt Active Power Filter for Current Harmonic Mitigation
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Author(s): Rambir Singh (Motilal Nehru National Institute of Technology, India), Asheesh K. Singh (Motilal Nehru National Institute of Technology, India)and Rakesh K. Arya (M. P. Council of Science and Technology, India)
Copyright: 2013
Pages: 17
Source title:
Contemporary Theory and Pragmatic Approaches in Fuzzy Computing Utilization
Source Author(s)/Editor(s): Toly Chen (Feng Chia University, Taiwan)
DOI: 10.4018/978-1-4666-1870-1.ch011
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Abstract
This paper examines the size reduction of the fuzzy rule base without compromising the control characteristics of a fuzzy logic controller (FLC). A 49-rule FLC is approximated by a 4-rule simplest FLC using compensating factors. This approximated 4-rule FLC is implemented to control the shunt active power filter (APF), which is used for harmonic mitigation in source current. The proposed control methodology is less complex and computationally efficient due to significant reduction in the size of rule base. As a result, computational time and memory requirement are also reduced significantly. The control performance and harmonic compensation capability of proposed approximated 4-rule FLC based shunt APF is compared with the conventional PI controller and 49-rule FLC under randomly varying nonlinear loads. The simulation results presented under transient and steady state conditions show that dynamic performance of approximated simplest FLC is better than conventional PI controller and comparable with 49-rule FLC, while maintaining harmonic compensation within limits. Due to its effectiveness and reduced complexity, the proposed approximation methodology emerges out to be a suitable alternative for large rule FLC.
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