 Open Access
 Total Downloads : 4
 Authors : Karthickkumar.T, Dr. V. Kamaraj
 Paper ID : IJERTCONV2IS06018
 Volume & Issue : RTIA – 2014 (Volume 2 – Issue 06)
 Published (First Online): 30072018
 ISSN (Online) : 22780181
 Publisher Name : IJERT
 License: This work is licensed under a Creative Commons Attribution 4.0 International License
Three Phase Bridgeless Interleaved Active Power Factor Correction Converter
Three Phase Bridgeless Interleaved Active Power Factor Correction Converter
1 1
Tamilnadu, India
tkarthick2111@gmail.com1
Dr. V. Kamaraj3
Professor,
Department of Electricals & Electronics SSN College of Engineering, Kalavakkam Tamilnadu, India
kamarajv@ssn.edu.in2
Abstract In this paper, a new threephase acdc bridgeless interleaved power factor correction topology is proposed for battery charging applications. The topology provides improved power factor and efficiency in comparison to conventional bridge rectifier topology, and leads to a decrease in charger size, charging time and hence, is cost effective. A detailed circuit operation for this topology is presented. Simulation results are included for a boost converter converting AC input voltage 230 V to 750 V DC output. Simulation results show an improved power factor and reduced THD, when compared to conventional topology. Power factor in proposed BLIL PFC is improved by 2.19% and THD is reduced by 26.25%.
Keywords: Bridgeless Interleaved, THD, Power Factor, Displacment factor, Distortion factor, MatLab.

INTRODUCTION
A Universal battery charger is supplied using an external power supply. The battery charger module as shown in fig.1 consists of AC and DC filters in line and load side respectively, an ACDC Power Factor Correction (PFC) Boost converter is used for power factor correction which is followed by a DCDC converter. A controller is used to control the charger set up. The ACDC PFC boost converter is an important part in charger module. This ACDC has to be selected carefully. For this a threephase Bridgeless Interleaved (BLIL) PFC boost converter is proposed which will reduce the THD and increases the power factor.
Fig.1. Block diagram of a universal battery charger

PROPOSED THREEPHASE BLIL BOOST TOPOLOGY
The Threephase BLIL PFC converter shown in Fig. 2 is proposed to overcome the problems in conventional converters. The proposed threephase BLIL PFC Converter,consists of six MOSFETs, six diodes,six inductors
and a capacitor parallel to load. A detailed converter operation a steady state analysis is given in the following section
Fig.2. Proposed ThreePhase BLIL PFC Converter

CIRCUIT OPERATION AND STEADY STATE RIPPLE ANALYSIS
To analyze the circuit operation, the input line cycle has been separated into the positive and negative half cycles. Operation for each of the halfline cycles are explained in Sections 3.1 and 3.2 that follow.

POSITIVE HALF CYCLE OPERATION
Referring to Fig. 2, during the positive half cycle, when Phase A and Phase B are conducting, Q1/Q2 turn on and current flows through L1 and Q1 and continues through Q2 (and partially its body diode) and then L2, returning to the line while storing energy in L1 and L2. When Q1/Q2 turn off, energy stored in L1 and L2 is released as current flows through D1, through the load and returns through the body diode of Q2 back to the input mains. With interleaving, the same mode happens for Q4/Q5, but with a 180 phase delay. The operation for this mode is Q4/Q5 on, storing energy in L4/L5 through the path L4Q4Q5L5 back to the input. When Q4/Q5 turn off, en ergy is released through D4 to the load and returning through the body diode of Q5 back to the input mains.
During the positive half cycle, when Phase B and Phase C are conducting, Q2/Q3 turn on and current flows through L2
and Q2 and continues through Q3 (and partially its body diode)
(5)
and then L3, returning to the line while storing energy in L2 and L3. When Q2/Q3 turn off, energy stored in L2 and L3 is released as current flows through D2, through the load and returns through the body diode of Q3 back to the input mains. With interleaving, the same mode happens for Q5/Q6, but with a 180 phase delay. The operation for this mode is Q5/Q6 on, storing energy in L5/L6 through the path L5Q5Q6L6 back to the input. When Q5/Q6 turn off, energy is released through D5 to the load and returning through the body diode of Q6 back to the input mains. During the positive half cycle, when Phase C and Phase A are conducting, Q3/Q1 turn on and current flows through L3 and Q3 and continues through Q1 (and partially its body diode) and then L1, returning to the line while storing energy in L3 and L1. When Q3/Q1 turn off, energy stored in L3 and L1 is released as current flows through D3, through the load and returns through the body diode of Q1 back to the input mains. With interleaving, the same mode happens for Q6/Q4, but with a 180 phase delay. The operation for this mode is Q6/Q4 on, storing energy in L6/L4 through the path L6 Q6Q4L4 back to the input. When Q6/Q4 turn off, energy is released through D6 to the load and returning through the body diode of Q4 back to the input mains.
At this interval the change in capacitor voltage is given by
(6)
(7)
(8)
From Equation 8
(9)

NEGATIVE HALF CYCLE OPERATION
Negative half cycle operation is similar to that of the positive half cycle operation but the current flow direction will be in the opposite direction to that of the positive half cycle.
Where
Ts=
(10)


FINDING VALUES OF L AND C
Designing the values of L and C is very important. In the proposed BLIL PFC Converter the values of L and C are designed as follows.
Let us consider the instant when Phase A and Phase B are conducting. During this interval the voltage equation is given as
(1)
(2)
Assuming matched inductors, L1, L2, L4 and L5, the input ripple current is the sum of currents in L1/L2 and L4/L5
(3)
R=output resistance
Equation 5 and 10 gives the value of L and C respectively.

SIMULATION RESULTS

CONVENTIONAL BOOST CONVERTER TOPOLOGY
From Equation 3
(4)
Fig.3. MATLAB Implementation of Conventional Boost Converter Topology
Design parameters:
Switching Frequency : 25 KHz Input Voltage : 230 V
Output Voltage : 753 V
Duty Ratio : 0.67 Inductor : 131mH
Resistor : 200
Capacitor : 760Âµ F
Magnitude of Voltage (V) and Current (A)
Fig.4 and Fig.5 shows supply voltage and supply current and THD plot waveform of a Threephase Conventional PFC respectively for duty ratio 67%
Fig.4 Supply Voltage and Supply Current waveforms
Fig.5 THD plot
Power Factor= Kd * Kp Kd = cos, Kp= 1/
= Phase difference between input voltage and current
THD = Total Harmonic Distortion in input current Kd= Displacement Factor
Kp= Distortion Factor
Fig.6. MATLAB Implementation of Bridgeless Interleaved Boost Converter Topology
Design parameters:
Switching Frequency : 25 KHz Input Voltage : 230 V
Output Voltage : 757 V
Duty Ratio : 0.67/0.33 L1,L2,L3,L4,L5,L6 : 66.7 mH
Capacitor C : 975 Âµ F
Resistor R : 200
R1,R2,R3,R,R5,R6 : 25m
Fig.7 and Fig.8 shows supply voltage and supply current, THD plot and output voltage waveform of a Threephase BLIL PFC respectively for duty ratio 67%
Fig.7 Supply Voltage and Supply Current waveforms
0.0017sec
0
15.3
Cos
Kd
0.9645
THD
32.27%
Kp 0.9510
Fig.8 THD plot
PowerFacto
r Kd
* Kp
0.9172

BRIDGELESS INTERLEAVED BOOST CONVERTER TOPOLOGY
www.ijert.org 94
0
0.0022sec 24.3 Cos 09408
Kd Cos 0.9408 THD 6.02%
0
0.0025sec 22.5 Cos Kd 0.9238 THD 18.63%
Kp 0.9830
Kp 0.9982
PowerFactor
Kd * Kp 0.9080
PowerFactor
Kp * Kd 0.9391
Design parameters:
Switching Frequency : 25 KHz Input Voltage : 230 V
Output Voltage : 757 V
Duty Ratio : 0.33 L1,L2,L3,L4,L5,L6 : 66.7mH
Capacitor C : 975 Âµ F
Resistor R : 200
R1,R2,R3,R,R5,R6 : 25m
Fig.9 and Fig.10 shows supply voltage and supply current and THD plot waveform of a Threephase BLIL PFC respectively for duty ratio 33%
Fig.9 Supply Voltage and Supply Current waveforms
Fig.10 THD plot


COMPARISON OF THD AND POWER FACTOR
Since, it is threephase we have considered duty ratio as 67%. It is observed that the THD is reduced and the Power Factor is improved in proposed threephase BLIL topology compared to threephase conventional topology
TOPOLOGY
THD (%)
POWER
FACTOR
Threephase conventional
(D=0.67)
32.27
0.9172
Threephase BLIL
(D=0.67)
6.02
0.9391
Threephase BLIL
(D=0.33)
18.36
0.9080
Table1. Comparison of THD and power factor

Reduction in THD
=32.276.02=26.25%

Improvement in Power Factor
=0.93910.9172=0.0219
=2.19%


CONCLUSION
Thus from the above simulation results the following two were inferred. Duty ratio of 67% is best suited for three phase converter topology. THD is reduced and Power Factor is improved in proposed threephase BLIL PFC converter compared to Conventional topology.

REFERENCES

K. Morrow, D. Karner and J. Francfort, Plugin hybrid electric vehicle charging infrastructure review, U.S. Dept. EnergyVehicle Technologies Program, Washington, DC, INLEXT0815058, 2008.

B. Singh, B. N. Singh, A. Chandra, K. AlHaddad, A. Pandey, and D. P. Kothari, A review of singlephase improved power quality ACDC converters, IEEE Trans. Ind. Electron., vol. 50, no. 5, pp. 962981, Oct. 2003.

L. Petersen and M. Andersen, Twostage power factor corrected power supplies: The low componentstress approach, in Proc. IEEE APEC, 2002, vol. 2, pp. 11951201.

IEEE Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems, IEEE Std. 5191992, 1992.

Compliance Testing to the IEC 100032 (EN 6100032) and IEC 100033 (EN 6100033) Standards, Agilent Technology.

U. Moriconi, A bridgeless PFC configuration based on L4981 PFC controller, STMicroelectronics, Geneva, Switzerland, Application Note AN1606, 2002.

J. M. Hancock, Bridgeless PFC Boosts LowLine Efficiency. Milpitas, CA: Infineon Technol., 2008.

L. Huber, Y. Jang, and M. M. Jovanovic, Performance evaluation of bridgeless PFC boost rectifiers, IEEE Trans. Power Electron., vol. 23, no. 3, pp. 13811390, May 2008.

www.mathworks.in

www.math.utah.edu

L. Balogh and R. Redl, Powerfactor correction with interleaved boost converters in continuousinductorcurrent mode, in Proc. IEEE Appl. Power Electron. Conf. Expo., 1993, pp. 168174.

T. S. Key and J.S. Lai, IEEE and international harmonic standards impact on power electronic equipment design, in Proc. IECON, 1997, vol. 2, pp. 430436.

www.mathworks.com/access/helpdesk/help/toolbox/physmod/po wersys/powersys.html.

F. Musavi, W.Eberle and W.G.Dunford A high performance singlephase bridgeless interleaved PFC converter for plugin hybrid electric vehicle battery chargers, IEEE Trans. Industry Applications., vol. 47, pp. 18331843, Jul. 2011.

Fariborz Musavi, Murray Edington,Wilson Eberle and William
G. Dunford, Evaluation and Efficiency Comparison of Front End ACDC Plug Hybrid Charger Topologies, IEEE Transaction on smart grid, vol. 3, no. 1, pp.413421 March 2012.