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Frontiers in Energy

Front. Energy    2020, Vol. 14 Issue (1) : 166-179     https://doi.org/10.1007/s11708-018-0549-z
RESEARCH ARTICLE
Performance analysis of series/parallel and dual side LCC compensation topologies of inductive power transfer for EV battery charging system
P. Srinivasa Rao NAYAK, Dharavath KISHAN()
Department of Electrical and Electronics Engineering, National Institute of Technology, Tiruchirappalli 620015, India
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Abstract

In an inductive battery charging system, for better power transfer capability and attaining required power level, compensation is necessary. This paper analyzes series/parallel (S/P) and dual side inductor-capacitor-capacitor (LCC) compensation topologies for inductive power transfer of electric vehicle (EV) battery charging system. The design and modeling steps of inductive power transfer for electric vehicle battery charging system are presented. Besides, the equivalent electrical circuits are used to describe the circuit compensation topologies. The results convey that the efficiency of dual side LCC compensation is higher than that of S/P compensation at variable mutual inductance (misalignment).

Keywords series/parallel compensation      electric vehicle (EV)      dual side LCC compensation      inductive power transfer     
Corresponding Authors: Dharavath KISHAN   
Just Accepted Date: 26 January 2018   Online First Date: 21 March 2018    Issue Date: 16 March 2020
 Cite this article:   
P. Srinivasa Rao NAYAK,Dharavath KISHAN. Performance analysis of series/parallel and dual side LCC compensation topologies of inductive power transfer for EV battery charging system[J]. Front. Energy, 2020, 14(1): 166-179.
 URL:  
http://journal.hep.com.cn/fie/EN/10.1007/s11708-018-0549-z
http://journal.hep.com.cn/fie/EN/Y2020/V14/I1/166
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P. Srinivasa Rao NAYAK
Dharavath KISHAN
Fig.1  Basic block diagram of wireless EV battery charging system
Fig.2  Equivalent circuit model of WPT system coils
Description Value
Population size, N 10
Acceleration coefficient, C1 1.2
Acceleration coefficient, C2 1
Inertia weight, w 0.9
Ending criteria-iterations 50
Tab.1  Parameters used in the implementation of PSO for boost converter
Fig.3  Four conventional compensation topologies
Fig.4  Series/parallel compensation topology for WPT
Fig.5  Dual sided LCC compensation topology for WPT
Fig.6  Schematic diagram of closed loop controller for boost converter
Fig.7  Boost converter convergence graph with PSO based controller
Parameter Specification
Number of turns in transmitter 26
Number of turns in receiver 26
Coil diameter/cm 30
Conductor radius/mm 5
Self-inductance of transmitter/µH 230
Self-inductance of receiver/µH 230
Vertical distance varied/mm 10–200
Mutual inductance/µH 5–50
Coil design type Circular
Tab.2  Coil specifications for FEM simulation
Fig.8  (a) FEM coil setup; (b) magnetic flux density distribution between the coils
Fig.9  Distance vs mutual inductance and coupling factor
Parameter Description S/P LCC
Vdc Input voltage/V 60 60
L1 Transmitter inductance/µH 230 230
L2 Receiver inductance/µH 230 230
f Resonant frequency/kHz 20 20
Po Maximum output power/W 600 600
M Mutual inductance/µH 5–50 5–50
C1 Transmitter side capacitance/µF 27 0.329
C2 Receiver side capacitance/µF 27 0.329
Lf1 Transmitter series inductance/µH - 37.79
Lf2 Receiver series inductance/µH - 37.79
Cf1 Transmitter parallel capacitance/µF - 1.677
Cf2 Receiver parallel capacitance/µF - 1.677
RL Load resistance/Ω 15 15
Tab.3  Specification and parameters of the system
Fig.10  Calculated, simulated and measured currents of S/P and dual side LCC compensation system
Fig.11  Transmitter current of S/P compensation
Fig.12  Transmitter current of dual side LCC compensation
Fig.13  Magnitudes of power for S/P and dual side LCC compensation system
Fig.14  The setup developed in the laboratory
Fig.15  Series/parallel compensated IPT system
Fig.16  Transmitter current of S/P compensation for different mutual inductance value
Fig.17  Transmitter current of dual side LCC compensation for different mutual inductance value
Parameter Conventional method PSO method
KP 0.126 9.216
KI 11.32 24.315
Settling time (ts)/ms 45 22.32
Steady-state error (ess)/V 1.46 0.35
Tab.4  Comparison of time response of the boost converter with conventionally obtained controller and PSO-tuned controller
Fig.18  Time response of the boost converter
Fig.19  Calculated, simulated and measured efficiency of S/P and dual side LCC compensation system
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