www.ijatir.org ISSN 2348–2370 Vol.08,Issue.03, March-2016, Pages:0505-0512 Copyright @ 2016 IJATIR. All rights reserved. Bridgeless Buck–Boost Converter-Fed BLDC Motor Drive with Fuzzy Based Power Factor Correction B. V. P. CHAITANYA 1 , AFROZ SHAIK 2 1 PG Scholar, Dept of EEE, Guntur Engineering College, Yanamadala, Guntur (Dt), AP, India. 2 Assistant Professor, Dept of EEE, Guntur Engineering College, Yanamadala, Guntur (Dt), AP, India. Abstract: The devices typically utilized in industrial, commercial and residential applications got to undergo rectification for their correct functioning and operation. Hence there's a requirement to cut back the line current harmonics thus on improve the power factor of the system. This has led to designing of Power factor Correction circuits. This project presents a Power Factor Corrected (PFC) bridgeless (BL) Buck–Boost converter fed Brushless Direct Current (BLDC) motor drive as a cost-effective answer for low-power applications. The conventional PFC scheme of the BLDC Motor drive utilizes a Pulse Width Modulated - Voltage Source Inverter (PWM-VSI) for speed control with a constant dc link voltage. This offers higher switching losses in VSI because the switching losses increase as a square function of switching frequency. A BL configuration of the Buck–Boost converter is proposed that offers the elimination of the diode bridge rectifier, thus reducing the conduction losses related to it. A PFC BL buck–boost converter is designed to operate in discontinuous inductor current mode (DICM) with Fuzzy logic controller to produce an inherent PFC at ac mains. The simulation results are given by using Matlab/Simulink software. Keywords: Brushless Direct Current (BLDC) Motor, Bridgeless (BL) Buck–Boost Converter, Discontinuous Inductor Current Mode (DICM), Power Factor Corrected (PFC), Power Quality. I. INTRODUCTION Brushless DC (BLDC) motors are recommended for many low and medium power drives applications because of their high efficiency, high flux density per unit volume, low maintenance requirement, low EMI problems, high ruggedness and a wide range of speed control.[1-2] Due to these advantages, they find applications in numerous areas such as household application, transportation (hybrid vehicle), aerospace, heating, ventilation and air conditioning (HVAC), motion control and robotics, renewable energy application etc. The BLDC motor is a three phase synchronous motor consisting of a stator having a three phase concentrated windings and a rotor having permanent magnets. It doesn‟t have mechanical brushes and commutator assembly, hence wear and tear of the brushes and sparking issues as in case of conventional DC machines are eliminated in BLDC motor and thus has low EMI problems.[3-5] This motor is also referred as electronically commutated motor (ECM) since an electronic commutation based on the Hall-Effect rotor position signals is used rather than a mechanical commutation. A BLDC motor when fed by a diode bridge rectifier(DBR) has higher conduction losses. The high conduction loss caused by the high forward voltage drop of the bridge diode begins to degrade the overall system efficiency. The heat generated within the bridge rectifier may destroy the individual diodes. Hence, it becomes necessary to utilize abridge rectifier with higher currenthandling capability or heat dissipating characteristics. This increases the size and cost of the power supply, which is unacceptable for an efficient design. Bridgeless topology seems to be the best solution for reducing the conduction and switching losses of the converter. Up to now, more than 80% of the controllers are PI (Relative and vital) controllers on the grounds that they are effortless and straightforward . The velocity controllers are the routine PI controllers and current controllers are the P controllers to accomplish superior commute. Fuzzy Logic can be considered as scientific hypothesis joining multi esteemed rationale, likelihood hypothesis, counterfeit consciousness to recreate the human approach in the arrangement of different issues by utilizing an estimated thin king to relate diverse information sets and to make choices. It has been accounted for that fuzzy controllers are more powerful to plant parameter changes than traditional PI controllers and have better clamor dismissal capacities. This paper presents a BL buck–boost converter fed BLDC motor drive with variable dc link voltage of VSI for improved Power Quality at ac mains with reduced components and superior control. II. PROPOSED SYSTEM The proposed BL buck–boost converter based VSIfed BLDC motor drive is shown in Fig.1. The parameters of the BL Buck–Boost converter are made such that it operates in Discontinuous Inductor Current Mode (DICM) to attain an inherent Power Factor Correction at ac mains. The speed control of BLDC motor is accomplished by the dc link voltage control of VSI using a BL Buck–Boost converter. This reduces the switching losses in VSI because
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www.ijatir.org
ISSN 2348–2370
Vol.08,Issue.03,
March-2016,
Pages:0505-0512
Copyright @ 2016 IJATIR. All rights reserved.
Bridgeless Buck–Boost Converter-Fed BLDC Motor Drive with Fuzzy
Based Power Factor Correction B. V. P. CHAITANYA
1, AFROZ SHAIK
2
1PG Scholar, Dept of EEE, Guntur Engineering College, Yanamadala, Guntur (Dt), AP, India.
2Assistant Professor, Dept of EEE, Guntur Engineering College, Yanamadala, Guntur (Dt), AP, India.
Abstract: The devices typically utilized in industrial,
commercial and residential applications got to undergo
rectification for their correct functioning and operation.
Hence there's a requirement to cut back the line current
harmonics thus on improve the power factor of the system.
This has led to designing of Power factor Correction circuits.
This project presents a Power Factor Corrected (PFC)
bridgeless (BL) Buck–Boost converter fed Brushless Direct
Current (BLDC) motor drive as a cost-effective answer for
low-power applications. The conventional PFC scheme of
the BLDC Motor drive utilizes a Pulse Width Modulated -
Voltage Source Inverter (PWM-VSI) for speed control with
a constant dc link voltage. This offers higher switching
losses in VSI because the switching losses increase as a
square function of switching frequency. A BL configuration
of the Buck–Boost converter is proposed that offers the
elimination of the diode bridge rectifier, thus reducing the
conduction losses related to it. A PFC BL buck–boost
converter is designed to operate in discontinuous inductor
current mode (DICM) with Fuzzy logic controller to produce
an inherent PFC at ac mains. The simulation results are