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Cuckoo search (CS)-NFC-based UPQC for compensating voltage sag of nonlinear load

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In this paper, a cuckoo search (CS) algorithm-based neuro-fuzzy controller (NFC) is developed to improve the performance of unified power quality conditioner (UPQC). The CS algorithm is used for optimising the output of neural network (NN) so that the classification output of the NN is enhanced. The inputs of the networks are error and change of error voltage of the PQ issue signal of nonlinear load which are calculated by comparison with the reference signal. Next, the output of network, i.e. regulated (compensated) voltage, is optimised by the CS algorithm. From the output of CS, an optimum rule-based fuzzy interference system is developed and the PQ problem is compensated. The CS-NFC-based UPQC is implemented in MATLAB/Simulink and the PQ issue clearing performance is analysed. The PQ issue clearing performance of proposed UPQC is compared with traditional UPQC, NFC-UPQC, GA-NFC-UPQC and adaptive GA-NFC-UPQC. The CS-NFC-based UPQC controller has lesser error deviation of 2.8% with traditional UPQC, 2.12% with NFC, 1.7% with GA-NFC and 0.6% with adaptive GA-NFC.
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Keywords: NFC; PQ; UPQC; cuckoo search; voltage regulation; voltage sag

Document Type: Research Article

Affiliations: 1: Department of Electrical and Electronics Engineering, Noorul Islam University, Nagercoil, India 2: Department of Electrical Engineering, Noorul Islam University, Nagercoil, India

Publication date: November 2, 2015

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