Low-Frequency Underwater Wireless Power Transfer: Maximum Efficiency Tracking Strategy

This paper proposes a strategy to improve the efficiency of a low-frequency Wireless Power Transfer (WPT) system used to charge the battery of an Autonomous Underwater Vehicle (AUV) through an Inductive Power Transfer (IPT). The IPT system uses a Split-Core Transformer (SCT) to transfer power from the docking base to the AUV, without electric contact. Under gap variation, the efficiency is changed because the variation of SCT parameters. Therefore, the input frequency is changed in order to improve the efficiency of the system trough the Maximum Efficiency Point Tracking algorithm (MEPT) without communication between primary and secondary sides. Experimental results are presented to validate the theoretical analysis and to demonstrate the behaviour of the transformer under different values of gap and excitation frequency.

[1]  Kai Song,et al.  Design and Loss Analysis of Loosely Coupled Transformer for an Underwater High-Power Inductive Power Transfer System , 2015, IEEE Transactions on Magnetics.

[2]  Colonel William T. McLyman,et al.  Transformer and inductor design handbook , 1978 .

[3]  Chunting Chris Mi,et al.  Frequency Optimization of a Loosely Coupled Underwater Wireless Power Transfer System Considering Eddy Current Loss , 2019, IEEE Transactions on Industrial Electronics.

[4]  E. M. M. Costa.  Effects of Induced Electromotive Force (EMF) in Transformers Built with Planar Coils , 2011, IEEE Latin America Transactions.

[5]  Song Baowei,et al.  Comparison of two electromagnetic couplers in an inductive power transfer system for Autonomous Underwater Vehicle docking application , 2016, OCEANS 2016 - Shanghai.

[6]  U. Madawala,et al.  A Bidirectional Inductive Power Interface for Electric Vehicles in V2G Systems , 2011, IEEE Transactions on Industrial Electronics.

[7]  Gwyn Griffiths,et al.  Technology and applications of autonomous underwater vehicles , 2002 .

[8]  Pedro G. Barbosa,et al.  Design And Optimization Of Compensation Of A Separate Core Transformer Used To Recharge The Battery Of An Autonomous Underwater Vehicle , 2014 .

[9]  Pedro M. de Almeida,et al.  Unipolar PWM predictive current-mode control of a variable-speed low inductance BLDC motor drive , 2017 .

[10]  Canjun Yang,et al.  Design of an ICPT system for battery charging applied to underwater docking systems , 2017 .

[11]  Chunting Chris Mi,et al.  Wireless Power Transfer for Electric Vehicle Applications , 2015, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[12]  Zhengming Zhao,et al.  Maximum efficiency point tracking of the wireless power transfer system for the battery charging in electric vehicles , 2015, 2015 18th International Conference on Electrical Machines and Systems (ICEMS).

[13]  Ying Chen,et al.  Frequency selection of an inductive contactless power transmission system for ocean observing , 2013 .

[14]  Marian P. Kazmierkowski,et al.  Contactless battery charger with bi-directional energy transfer for plug-in vehicles with vehicle-to-grid capability , 2011, 2011 IEEE International Symposium on Industrial Electronics.

[15]  Kevin Lin,et al.  Underwater wireless power transfer , 2015, 2015 IEEE Wireless Power Transfer Conference (WPTC).

[16]  Ming Ting-tao,et al.  Design of loosely coupled inductive power transfer systems , 2006 .

[17]  T. McGinnis,et al.  Inductive Power System for Autonomous Underwater Vehicles , 2007, OCEANS 2007.

[18]  H. M. Santos,et al.  Simulation and experimental evaluation of a resonant magnetic wireless power transfer system for seawater operation , 2016, OCEANS 2016 - Shanghai.

[19]  Ying Chen,et al.  Design considerations for electromagnetic couplers in contactless power transmission systems for deep-sea applications , 2010, Journal of Zhejiang University SCIENCE C.

[20]  Jie Li,et al.  A Maximum Efficiency Point Tracking Control Scheme for Wireless Power Transfer Systems Using Magnetic Resonant Coupling , 2015, IEEE Transactions on Power Electronics.

[21]  Lawrence S. Kroll.  Mathematica--A System for Doing Mathematics by Computer. , 1989 .

[22]  Peng Zhang,et al.  Analysis, Design, and Maximum Power-Efficiency Tracking for Undersea Wireless Power Transfer , 2018, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[23]  Jermana Lopes de Moraes,et al.  Battery Charger Lead-Acid using IC BQ2031 , 2016, IEEE Latin America Transactions.

[24]  John T. Boys,et al.  Stability and control of inductively coupled power transfer systems , 2000 .

[25]  Wei Gu,et al.  Experimental investigation of frequency characteristics of underwater wireless power transfer , 2018, 2018 IEEE MTT-S International Wireless Symposium (IWS).