1 Research and Development of Machine Drives and Power Conditioning and its Development for Electric Vehicles From 1999 to 2009 Prof. Eric Cheng Department of Electrical Engineering

2 Four RGC projects leads to Electric Vehicles  From 1999 to 2002 Future Switched Reluctance Machine Drives and Associated Power Conditioning (RGC: PolyU5085/98E)  From 2003 to 2005 Development of the Future Power Conversion Techniques Using Adaptive Control and Integrated Magnetics (PolyU 5103/01E)  From 2004 to 2007 Design and Modeling of An Integrated Fuel Cell and Energy Storage System to Enhance Power System Performance and Reliability(PolyU 5245/04E)  From 2007 to 2009 Formulation of DC Energy Factor and Its Implication on Control Method for High Efficiency Power Electronics Conversion System (PolyU 5136/06E)

3 Future Switched Reluctance Machine Drives and Associated Power Conditioning (RGC: PolyU5085/98E) (1999~2004) Outcome Proposition of four models of SRM drives Investigation of effects of control and output parameters on power factor in SRM drives Proposition of new method to design controller with good power factor Development of schemes to improve power factor in SRM drives Development a soft-switching power conditioning

4 Future Switched Reluctance Machine Drives and Associated Power Conditioning (RGC: PolyU5085/98E) (1999~2004) Published papers 10 Journal papers 11 Conference papers

5 The two-dimensional bicubic spline interpolation is used to describe the nonlinear magnetic characteristics in switched reluctance motors Simulation of Switched Reluctance Motor Drives Using Two-dimensional Bicubic Spline IEEE Transactions on Energy Conversion

6 Influences of Outputs and Control Parameters upon the Power Factor Establish the comprehensive SRM drives design, and is valuable to designing the good controller with high power factor Electrical Components and Systems

7 An Algorithm for Solving Initial Value Problems of Mutual-Coupling The non-linear modeling of multiphase switched reluctance motors can be used to simulate SRM more accurately. Electrical Components and Systems

8 Trigonometry-Based Numerical Method and Self- Training Numerical to Compute Nonlinear Magnetic Characteristics Provide a valuable approach for performance torque prediction, design, simulation, sensorless drive and control of SRMs IEEE Transactions on Magnetics

9 Improvement of Power Factor Drives through Optimizing the Switching Angles A novel control strategy to improve the power factor of switched reluctance motor drives is proposed and the two schemes to improve the power factor are developed. Electrical Components and Systems

10 Correlation of Modeling Techniques and Power Factor IEE Proceedings Electric Power Applications Unified modeling on sensorless control and power factor improvement of switched reluctance machine drives

11 Position Stepping Method Based on 2-D bicubic spline and 2-D bilinear spline, the proposed position stepping method is used to predict the performances of switched reluctance motor (SRM) drives. IEEE Transactions on Energy Conversion

12 DC-DC Power Conditioning Switched-capacitor power conditioning A family of circuit topology Improve the current shaping of the switched-reluctance drive IET Proceedings/Letter, IEEE Trans Ind. Elec, EPCS

13 Development of the Future Power Conversion Techniques Using Adaptive Control and Integrated Magnetics (RGC: PolyU5103/01E) (2002~2004) Published papers 7 Journal papers 5 Conference papers

14 Project Outcomes Developed a new analyzed method for integrated magnetics Developed the passivity control method for power converters Developed a new Quasi Current Mode Control for DC-DC power converter

15 Integrated Magnetics Boost-flyback converter Integrated magnetics version of Forward converter Developed a number of integrated magnetic circuits Examine the efficiency performance vs energy processing IEE Proceedings EPA

16 Passivity control Improvement of the output response using PBC new method Conventional Developed an adaptive controller for the phase-shifted controller Based on a passivity control theory IEE Proceedings EPA

17 Two Axis Indirect Current Mode Control Phasor diagram of the resonant circuit Controlled PSRC with new structure IEEE Trans Power E A novel indirect current mode control system with voltage compensation for the control of the phase shifted resonant converter Regulating the quadrature components of the voltage applied to the resonant circuit

18 Design and Modeling of An Integrated Fuel Cell and Energy Storage System to Enhance Power System Performance and Reliability(PolyU 5245/04E) (2004~2007) Fuel cell vehicle Outcomes Developed a mathematic model of both dynamic and state-state for fuel cell Fuel cell with magnetic energy storage New family of ZCS and ZVS power conditioning Published papers 2 Journal papers 2 Conference papers

19 Unified Mathematical Modelling of Steady-State and Dynamic Voltage-Current Characteristics for PEM Fuel Cells Developed a novel approach for optimization of operating points of fuel cells and design of power conditioning units, simulators, and system controllers. Electrochimical Acta

20 ZVS and ZCS buck-boost converter Buck-boost Zepic 1.Work well with fuel cell 2.Has applied to fuel cell vehicle 3.Zero-current and zero-voltage switching 4.Family of circuits developed (IET Power Electronics)

21 Formulation of DC Energy Factor and Its Implication on Control Method for High Efficiency Power Electronics Conversion System (PolyU 5136/06E) (2007~2009) Develop a new definition of the energy factor for DC-DC power conversion Developed the energy factor control method Improve efficiency of the converter through energy factor Published papers 2 Submitted Journal papers 2 Conference papers

22 Boundary condition analysis Developed the boundary condition for the Switched-mode converter Developed the formulation of energy factor under boundary condition

23 Generalized analysis for energy storage Non-active instantaneous power Input energy factors under CCM Energy Factor Under CCM Developed the generalized energy in storage device Developed the characteristics with duty ratio Provide the techniques to select power converter for various power applications

24 The Development of Electric Vehicles Through the GRC projects, it leads to the following technological developments: –SR motor design –SR motor drive –High frequency magnetic design –Family of switched mode high power converters –Soft-switching power condition –Fuel cell power conditioning –Energy storage device –Optimal Performance of converters

25 Motor and Drives Electric Vehicle Development Integration of motor and wheel Reduce all the mechanical interfacing In-wheel motor vehicle SRM driverSRM Finite element model

26 Power Converter Driver to LED and HID Lighting LED Headlight HID lamp ballast LED lamp and driver LED Tail light Developed the LED driver Developed the HID lamp driver Installed on commercial vehicle LED and HID headlight HID lamp

27 Charging system CLP Power charging system in Hong Kong High power fast charger Simple plug-in EV Battery Management System

28 In-wheel motor for 4-wheel drive 1 st Electric Vehicle using in- wheel reluctance drives

29 DC-DC Power Design for Electric Vehicle 1 st commercial vehicle in HK Conversion to EV

30 Summary Research and development of Power Electronics technology in Switched Reluctance Machine drives, DC-DC Power Conversion, Magnetics and Energy Storage Advanced design and control techniques have been developed. Arising from RGF, 20 journal papers and numerous conference papers have been published. Applications to electric vehicles are most prominent Extend the research to commercial products and collaborate with a number of companies CLP, Tenpao, Shun Hing Power, Fok Yin Tung, Hopewell,…

31 Thank You