www.ijatir.org ISSN 2348–2370 Vol.07,Issue.21, December-2015, Pages:4213-4220 Copyright @ 2015 IJATIR. All rights reserved. Implementation of Fuzzy Logic Controlled Based PFC Cuk Converter Fed BLDC Motor Drive BODDAPU SURESH 1 , DR. N. SAMBA SIVA RAO 2 1 PG Scholar, Dept of EEE, NRI Institute of Technology, Agiripalli, Krishna (Dt), AP, India. 2 Professor & HOD, Dept of EEE, NRI Institute of Technology, Agiripalli, Krishna (Dt), AP, India. Abstract: This paper provides the detailed analysis of the DC-DC chopper fed Brushless DC motor drive used for low-power applications. The various methods used to improve the power quality at the ac mains with lesser number of components are discussed. The most effective method of power quality improvement is also simulated using MATLAB/Simulink. It utilizes one control signal over the whole line cycle. In addition, the proposed converter exhibits low inrush current and low magnetic emissions as classical Cuk topology. The partial elimination of diodes in DBR in the bridgeless topology results in lower conduction losses as compared with conventional Cuk converter. The speed of the BLDC motor is controlled by varying the Dc bus voltage of voltage source inverter(VSI) which uses a low frequency switching of VSI (electronic commutation of BLDC motor) for low switching losses. A diode bridge rectifier (DBR) followed by a Cuk converter working in discontinuous conduction mode (DCM) is used for control DC link voltage with unity power factor at AC mains. The fuzzy based controller system is used for general purpose industrial applications. Keywords: CCM, Cuk converter, DCM, PFC, BLDC Motor, Power Quality, Fuzzy Logic Control. I. INTRODUCTION BLDC motors are most popular in household appliances over the last few decades [1-3]. As the name indicates, it has no brushes for commutation thus eliminates the disadvantages of wear and tear in conventional DC motors. The switches are electronically commutated with the help of rotor position detected using hall sensors. Hence the BLDC motor is also known as electronically commutated motor [4- 5]. Power quality problems have become important issues in these motors due to the recommended limits of harmonics in supply current by various international power quality standards such as the International Electro technical Commission (IEC) 61000-3-2 [6]. Combination of motor with inverter is the BLDC motor setup. BLDC motor is powered with two level inverter. The two level inverter composed of 6 switches. Based on rotor position obtained from hall sensors/optical encoders/resolvers, the power electronic switches are commutated. 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 a bridge rectifier with higher current handling capability or heat dissipating characteristics. In this PFC converter a DC-DC converter topology is mostly used amongst several available topologies with variations of capacitive/inductive energy transfer (e.g. boost, buck-boost, Cuk, SEPIC, zeta converters). It results in an improved performance, such as reduction of AC mains current harmonics, acoustic noise, electromagnetic interference (EMI) and improved efficiency, wide input voltage range utilization etc. This paper deals with an application of a PFC converter for the speed control of a PMBLDCMD. For the proposed voltage controlled drive, a Cuk dc–dc converter is used as a PFC converter because of its continuous input and output currents, small output filter, and wide output voltage range as compared to other single switch converters [10]–[12]. Moreover, apart from PQ improvement at ac mains, it controls the voltage at dc link for the desired speed of the Air-Con with the help of suitable fuzzy logic controller. So an attempt is made to remove the drawbacks associated with sensored control [14] and use of traditional controllers by using sensor less control and fuzzy controller for PMBLDC motor. Thus this method of sensor less control of PMBLDC will provide advantages like cost reduction, reliability, elimination of difficulty in maintaining the sensor etc. and developing nonlinear system for embedded control. In recent years, the number and variety of applications of Fuzzy Logic (FL) have increased significantly. To understand why use of Fuzzy Logic has grown, it must be first understood as what is meant by Fuzzy Logic. Fuzzy Logic has two different meanings. In a narrow sense, Fuzzy Logic is a logical system, which is an extension of multivalve logic. However, in a wider sense Fuzzy Logic is almost synonymous with the theory of Fuzzy sets, a theory which relates to classes of objects with un sharp boundaries in which membership is a matter of
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www.ijatir.org
ISSN 2348–2370
Vol.07,Issue.21,
December-2015,
Pages:4213-4220
Copyright @ 2015 IJATIR. All rights reserved.
Implementation of Fuzzy Logic Controlled Based PFC Cuk Converter Fed
BLDC Motor Drive BODDAPU SURESH
1, DR. N. SAMBA SIVA RAO
2
1PG Scholar, Dept of EEE, NRI Institute of Technology, Agiripalli, Krishna (Dt), AP, India.
2Professor & HOD, Dept of EEE, NRI Institute of Technology, Agiripalli, Krishna (Dt), AP, India.
Abstract: This paper provides the detailed analysis of the
DC-DC chopper fed Brushless DC motor drive used for
low-power applications. The various methods used to
improve the power quality at the ac mains with lesser
number of components are discussed. The most effective
method of power quality improvement is also simulated
using MATLAB/Simulink. It utilizes one control signal
over the whole line cycle. In addition, the proposed
converter exhibits low inrush current and low magnetic
emissions as classical Cuk topology. The partial
elimination of diodes in DBR in the bridgeless topology
results in lower conduction losses as compared with
conventional Cuk converter. The speed of the BLDC motor
is controlled by varying the Dc bus voltage of voltage
source inverter(VSI) which uses a low frequency switching
of VSI (electronic commutation of BLDC motor) for low
switching losses. A diode bridge rectifier (DBR) followed
by a Cuk converter working in discontinuous conduction
mode (DCM) is used for control DC link voltage with
unity power factor at AC mains. The fuzzy based controller
system is used for general purpose industrial applications.
Keywords: CCM, Cuk converter, DCM, PFC, BLDC
Motor, Power Quality, Fuzzy Logic Control.
I. INTRODUCTION
BLDC motors are most popular in household
appliances over the last few decades [1-3]. As the name
indicates, it has no brushes for commutation thus
eliminates the disadvantages of wear and tear in
conventional DC motors. The switches are electronically
commutated with the help of rotor position detected using
hall sensors. Hence the BLDC motor is also known as
electronically commutated motor [4- 5]. Power quality
problems have become important issues in these motors
due to the recommended limits of harmonics in supply
current by various international power quality standards
such as the International Electro technical Commission
(IEC) 61000-3-2 [6]. Combination of motor with inverter
is the BLDC motor setup. BLDC motor is powered with
two level inverter. The two level inverter composed of 6
switches. Based on rotor position obtained from hall
sensors/optical encoders/resolvers, the power electronic
switches are commutated. 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 a bridge rectifier with
higher current handling capability or heat dissipating
characteristics.
In this PFC converter a DC-DC converter topology is
mostly used amongst several available topologies with
variations of capacitive/inductive energy transfer (e.g.
boost, buck-boost, Cuk, SEPIC, zeta converters). It results
in an improved performance, such as reduction of AC
mains current harmonics, acoustic noise, electromagnetic
interference (EMI) and improved efficiency, wide input
voltage range utilization etc. This paper deals with an
application of a PFC converter for the speed control of a
PMBLDCMD. For the proposed voltage controlled drive, a
Cuk dc–dc converter is used as a PFC converter because of
its continuous input and output currents, small output filter,
and wide output voltage range as compared to other single
switch converters [10]–[12]. Moreover, apart from PQ
improvement at ac mains, it controls the voltage at dc link
for the desired speed of the Air-Con with the help of
suitable fuzzy logic controller. So an attempt is made to
remove the drawbacks associated with sensored control
[14] and use of traditional controllers by using sensor less
control and fuzzy controller for PMBLDC motor. Thus this
method of sensor less control of PMBLDC will provide
advantages like cost reduction, reliability, elimination of
difficulty in maintaining the sensor etc. and developing
nonlinear system for embedded control. In recent years, the
number and variety of applications of Fuzzy Logic (FL)
have increased significantly.
To understand why use of Fuzzy Logic has grown, it
must be first understood as what is meant by Fuzzy Logic.
Fuzzy Logic has two different meanings. In a narrow
sense, Fuzzy Logic is a logical system, which is an
extension of multivalve logic. However, in a wider sense
Fuzzy Logic is almost synonymous with the theory of
Fuzzy sets, a theory which relates to classes of objects with
un sharp boundaries in which membership is a matter of
BODDAPU SURESH, DR. N. SAMBA SIVA RAO
International Journal of Advanced Technology and Innovative Research