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Overview

Introduction

Innovation

Conclusion

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The power management system is proposed toshare load power between the PEM fuel cell and the Li-

Ion battery. The load power is divided into three states

such as the startup state, the charging state and the high

power state.

1 Introduction

The fuel cell air supply system controller is developed

based on the FC current decided by the power

management system. The optimum compressure power

which maximized the net power output of the FC system is

obtained as afunction of the fuel cell current.

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Innovation2

The hybrid system power control

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The hybrid system power control2

Power Management System (PMS): decidesthe operating power state of the hybrid power

system based on the algorithm developed for

hybrid power sharing.

Power Electronic Interface (PEI): the

implementation protocol of the power

management systems decisions through the

power converters.

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How many state

does the power

management

contain???

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Power management system2.1

Start-upState

ChargingState

High PowerState

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Power management system2.1

Start-upState

ChargingState

High Power

State

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Power management system2.1

Start-upState

ChargingState

High PowerState

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What does the

power electronic

interface

contain???

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Power electronic interface2.2

The Power Electronic Interface (PEI) makes acommon platform for the both power sources in order to

response the propulsion power demand.

PEI is consisted of:

UBC (unidirectional boost converter)

BDC (bidirectional converter)

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Operational principle2.3

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Air supply control system2.4

The PEMFC air supply system controller is developed to

achieve maximum net power out put from the fuel cell

system.

The relationship between the power gained Pnetand the

compressure pressure ratio P2/P1

n: the number of cells

i: the fuel cell current

C: a constant for the FC system

T: the cell temperature

c: efficiencies of the compressor

m: efficiencies of compressor motors

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Air supply control system2.4

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Air supply control system2.4

The optimum compressure power:

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Build the hybrid system control

Optimize power management and improve system

efficiency

During the start of the system, the battery powers the

load to ensure the FC cold starts easily.

Conclusion3

When the load steps up or down, as the FC can not

respond quickly, the battery will provide or absorb

the unbalanced energy, so the dynamic characteristicsof the whole system can be improved

The battery can provide peak power, so the power

rating of the FC can be decreased, reducing the total

cost.

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