04_power electronics research for hev and fcv

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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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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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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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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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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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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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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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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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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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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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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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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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Better Performance

Line-line voltage to the motor (proposed circuit)

Line-line voltage to the motor (traditional circuit)


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Thank you!

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04_power electronics research for hev and fcv

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