Multilevel Parallel Active Power Filter Based on ANFIS Controller for Harmonic Alleviation
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RESEARCH PAPER
Multilevel Parallel Active Power Filter Based on ANFIS Controller for Harmonic Alleviation M. Kalarathi1
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N. Rathina Prabha1
Received: 19 May 2020 / Accepted: 12 October 2020 Ó Shiraz University 2020
Abstract This paper implements a parallel active power filter (APF) with a three-level inverter and an adaptive neuro-fuzzy inference system (ANFIS)-based controller for voltage regulation. The limitations with nonlinear industrial loads are that they have high power rating and conventional two-level parallel APF cannot be used for mitigating harmonics in such applications. Hence, here a multilevel inverter-based parallel APF that meets the requirement of high-voltage high-power application is proposed. A three-level hysteresis current regulator generates gating pulses for the switches in parallel APF. The modified version of instantaneous real and reactive power (p–q) theory is applied for obtaining reference current with ease. Simulations are done to verify the performance of ANFIS controller in MATLAB with dynamic load changes and distorted supply condition. The outcome of simulation with ANFIS controller is compared with that of fuzzy logic controller (FLC), and its performance is found to be relatively better than FLC with respect to reduction in total harmonic distortion and regulation of inverter DC side capacitor voltage. Keywords Multilevel inverter Parallel active power filter ANFIS controller
1 Introduction Energy is a fundamental component of our day to-day activity and plays a pivotal role in orchestrating the functional aspects of modern world (Jayakumar et al. 2017). Recently, a significant development in the energy and power sector has resulted in induction of numerous nonlinear loads. As a consequence, there is a notable reduction in the power quality. To enhance the power quality, various solutions can be found across the literature such as passive filters, parallel active power filter, series active filters and hybrid active power filters (Chandra et al. 2000; Das 2004; Pinto et al. 2007; Bosch et al. 2018; Tareen and Mekhielf 2018). The AC and DC drives are being used in high-power industrial applications that result in unwanted harmonics. & M. Kalarathi [email protected] N. Rathina Prabha [email protected] 1
EEE Department, Mepco Schlenk Engineering College (Autonomous), Sivakasi 626005, India
For alleviating harmonics produced by high-power nonlinear loads, two-level APF cannot be used because of the reverse rating constraints of the switches used. Instead, a multilevel inverter-based parallel APF suitable for such high-power application is proposed here. Tolbert et al. implemented a power conditioner with two diode clamped multilevel converters in series–parallel configuration. A new-found control arrangement was executed for series and parallel inverter, and good compensation performance was attained under different testing conditions (Tolbert et al. 2000). An 81-level converter-based APF was implemented, and its performance was tested by Ortu´zarb et al. (2
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