04_power electronics research for hev and fcv
TRANSCRIPT
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Power Electronics Research for HEV and FCV
The Ohio State University
Department of Electric and Computer Engineering
1-614-688-4041 [email protected]
Oct. 24 2008
Dr. Jin Wang
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Power Electronics Research Group
Ohio State University
Outline of the Presentation
1. Power Electronics research group2. Understanding the real problems in automotive power electronics3. Research topics on Near term application Middle term application Long term application
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Power Electronics Research Group
Ohio State University
Power Electronics Research Group
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Research in HEV/FCV
Research in
Renewable Energy
Within EE, co-operate with Dr. Longya Xu and Dr. Vadim Utkin. The joint
research group has more than 12 graduate students working on power
electronics, motor design, and motor control.
Established in Oct. 2007.6 graduate students and 2 visiting scholars.One student defended master thesis in Aug. 2008.
Taming the electricity!
Actively working with CAR on both areas.
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Ohio State University3
Research Topics: From Concept to Realization
MVA inverter topology study for renewable energy Multilevel inverter switching angle calculation 150 kW universal inverter module Power electronics vs. high voltage testing and diagnostics
Traction Drive DC link capacitor current ripple minimization HEV battery characterization for power electronics design Thermoelectric cooling and generation for HEV Matrix converter based multilevel inverter for Fuel Cell PHEV charger related study
Renewable Energy and High Voltage
HEV
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Power Electronics Research Group
Ohio State University4
Understanding of Manufacturer Needs
Cost reduction:-------- Device and system level optimization, packaging, cooling, etc;
Reliability and fail safe strategy:
-------- Switching device and passive device reliability, failure mode analysis
(FMEA) and limited operation strategies (LOS);
Efficiency:
-------- Device design and PWM strategies;
EMI analysis and testing:
--------- Practical system level EMI reduction methods to lower the filter and wiring cost
Acoustic noise reduction:
--------- Magnetic component design and PWM strategies
Stability and control strategy studies:
--------- Stability of inter-connected converters and inverters
Circuit study for DC/DC converter, air conditioner drive:
--------- DC/DC converter efficiency and transient power capability
Energy storage devices
--------- Battery impedance modeling and testing
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Ohio State University
DC Link Capacitor Current Analysis for Hybrid Electric Vehicle
Near Term Applications
Example:
Optimization of passive componentsInteraction between battery and power electronicsPHEV charger circuit optimizationPHEV vs. Utility Transients
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Power Electronics Research Group
Ohio State University
Problem Statement
1. In the power electronics box of the hybrid electric vehicle, the film capacitoroccupies of the total volume and share more than 1/5 of the total cost.
2. The sizing of the DC link capacitor is decided by the RMS value of the currentripple goes into the capacitor.
3. In hybrid electrical vehicle, a boost converter and two inverter are connected tothe same DC link capacitor, thus minimized capacitor RMS current can beachieved by properly coordinate the control strategies of the converter and
inverters.
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Power Electronics Research Group
Ohio State University
Film Capacitor in Toyota Camry
Toyota Camry
Name Plate: 2098 uF, 750 VManufacture: NichiconSize: 26*17*4.5 mmWeight: 3.52 kg
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Power Electronics Research Group
Ohio State University
Results
The resulted program can be used by drive design engineers to
predicate the current into the DC link capacitor thus proper size thecapacitor.
Minimum current ripple can be achieved by coordination of the control of
the two inverters and converter.
Immediate application in HEV power electronics
design!
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Power Electronics Research Group
Ohio State University
Thermoelectric in Power Electronics
Middle Term Applications
Example:
Advanced thermal management for power electronics Study on the interactions between different power electronicscomponents on the dc bus
Efficiency optimization based on smart gate drive technology
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Power Electronics Research Group
Ohio State University
Introduction
Thermoelectric effect was discovered in 1821
In automotive, unfortunately or fortunately, so far thermoelectric is onlyused for cup holders to keep beverages at desired temperature
Currently, the predicated maximum efficiency from thermoelectricgeneration is less than 20%
In recent history, thermoelectric is mostly used for non-coolant refrigeratorand high end CPU cooling
Thermoelectric cooling (TEC) is more popular than thermoelectricgeneration (TEG) because of the capability limitation of the TEG material
So, countless research opportunities in this area
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Power Electronics Research Group
Ohio State University
Thermoelectric Module
Pairs of P/N Pellets Connected: Thermally in parallel Electrically in series Max. size 2 x 2
Modules may be connected in series or parallel
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Ohio State University
Matrix Converter based Multilevel Inverter for
Two Energy Sources
Long Term Applications
Example:
Traction drive inverter structure study. New HEV structure study (Ongoing preliminary study withChongqing Changan Motor)
PHEV vs. Utility, anther micro grid issue?Testing and validation service
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Power Electronics Research Group
Ohio State University
Circuit Design
Designed for vehicles involves two dc sources, such as fuel cell and batteryor battery and super capacitor.
Connects two dc sources and the ac machine with one power electronicscircuit
Realize multilevel inverter function
Lower cost and better performance!
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Power Electronics Research Group
Ohio State University
Better Performance
Line-line voltage to the motor (proposed circuit)
Line-line voltage to the motor (traditional circuit)
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Ohio State University
Thank you!
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