Space Power Workshop

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J"

Space Power Workshop

Source of Acquisition NASA Johnson Space Center

Electrical Power Distribution

&

Control

Modeling & Analysis

Dr. S. Johnny Fu

Mark Liffring Ishaque S. Mehdi

Boeing Phantom Works

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Space Power Workshop

Electrical Power Distribution

&

Control

Modeling

&

Analysis

Dr. S. Johnny Fu

Mark Liffring lshaque S. Mehdi

Boeing Phantom Works

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Modeling Requirements

• Electrical Power Distribution and Control (EPD&C)

Model Capabilities:

- EPD&C steady-state, transient and stability characteristics

-

Interface requirements of EPD&C with power source and

power

loads

- Integration

in the

End-to-End System

Model

which may

include electrical mechanical

,

hydraulic and chemical

system models

-

Software tool used for modeling and simulation also

supports analysis

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Modeling Approach

System Integrator's Perspective

A. Top-Down Analysis of System Architecture

-

Decompose the entire system into submodels

-

Define

the

submodels

in the integrated

systelll model

- Define interface

parameters

between

submodels

-

Determine the fidelity of

submodels

and component

models.

B. Bottom-Up Model Development Process

-

Develop component models

-

Integrate component models in the submodels

-

Integrate submodels in the end-to-end system

lTIodel

C. Model Validation

-

Validate thesllbmodels and the end-to-end model by test and

analysis data

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- - -

-Electro-Mechanical-Hydraulic

System

Model

• EPD&C in the End-to-End

Electro-Mechanical-Hydraulic Model

- Power Source

,

e.g.

,

Battery

-

EPD&C

-

Electrical Loads

-

Mechanical Loads

- Hydraulic Loads

• Example - EPD&C for Spa

'

ce Shuttle Electric

Auxiliary Power Unit

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'---'

Electrical Power Distribution

&

Control

Space Shuttle Electric Auxiliary Power Unit

Electric Auxiliary Power Unit

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270 VOC

Battery

EPD&C

EHDU

(E~ectro-Hydrauli<: Drive Unit)

~ 11111 111 11111 If 11111111 If 111I H II I I I

,

Motor Drive & Controtle Motor(

,

Hydrauli System J .1 ... II .... II'1I1IU." .... " .I .. ' 1

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l~

Model Development Software Tool

EASY5®

Matrix Algebra Tool Steady State Toolkit Simulation and Analysis Toolkit Real-TIme f9~~~~~1 T001 kit . 'l ,,';-", . af .. , ,-.," ~, Mom" ZSi1~_. . \~. ,-EASY5 Graphical Modeling ... :'~ "' ,1' ~ .. ~ , .""1: 't .. J ''1 ~"t,

r·

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, I '.., 1"'\, ' \ ~-" Advanced Modeling Libraries

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• • • •

EASY5®

http://www.boeing.comJeasy5/

A family of commercial software tools used to model, simulate and analyze dynamic systems.

Developed by Boeing and used world wide.

Model and simulate dynamic systems containing hydraulic, pneumatic, mechanical, thermal, electrical and digital sub-systems.

- Systems are conveniently modeled with functional blocks (summers,

dividers, wave generators, integrators, etc.) and/or with pre-defined components representing physical elements (pumps, gears, engines,

etc.), as well as user-defined models

in

FORTRAN code or C code.

- A complete set of user-friendly control system modeling, analysis and

design features is included.

Virtual prototyping of entire systems via links to other CAE software for multi-body and structural dynamics, controls, controller code generation, integrated circuit design, etc.

• Source code is automatica1ly generated to support real-time SilTIulation.

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,

I

EPD&C Modeling Approach

EASY5 Model Development

Lithium-Ion Battery Model

- Equivalent-Circuit Model - Electrochemical Model EPD&C Architecture & Parameters EAPUJEPD&C Model EASY5 • Libraries - General Purpose - Electric Drive - Thermal Hydraulic • Macro

Simulation & Analysis

• Steady State Analysis

• Transient Response • Power Quality • Stability EHDU Model Output Variables • Voltage • Current • Impedance HDE/NL; -l____

.~

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r-

-, -~--- ---

--EPD&C Modeling

• Develop EASY5 Power Distribution Systeln Submodel and integrated with Battery and

EHDU Models for End-to-End EAPU System Analysis

• Use the Stand-alone EPD&C Submodel for Detailed Simulation and Analysis

Initial Assumptions:

1. Paralneters Obtained from Ftight Unit Design:

EPD&C Input Cabling from Battery: R=1.732 mn, L=O.7804 )J.H

- 2 ft of 0 A WG wire and connector contacts

EPD&C : R=2.643 mn, L=0.4285 ~H

- Bus bars, fuses, contactors and connector contacts

EPD&C Output Cabling to EHDU: R=6.574 mO., L=7.48 ~H

- 21.3 ft of 2 A WG wire and connector contacts

2. Model will include System and Component Characteristics, without the Deta11ed Power

Electronics Modeling. HOE/AIC' .-_.--- -o w " '"" 0> "-"" o o "" _::::: o 'Z "" w o co 'Tl ;.-:>-1 "" tJ. W - I - I W W <0 o o Ul tTl ;.-~ r M Ul ... >-3 tTl (") o ~ [§J o "" o

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r

·'II

, MC4

·-MC4

-Current Passthrough

Batlery _ Output_Current

Ballery-8utput Current

Ballery _ utput=<=urrent Derivative (Approx)

EPD&C SubmodeI

EASY'S Schematics

l

1 -vative ..,

(Approx) De _(Approx)rivative

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~

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EAPU EASY5 Model Schematics

Bat1ery System

Baltery Temperature

I

30 ~

Ballery _ OUlpUl_ Curl

,

. Ballery _ Outpul_ Voltage

l' . . . 11 . . . I "

•

,. T ~ • EPD&C SUBMODEL

,.

•

• E HD U _1 npu._ y.ol \a ge II

•

1!1 III ___ m

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I

f

--

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B::1f-H~a-r

-

-'

EPD&C Submodel :

" - . • • • • • • It.IIlI!l~~mp,..

[. '"-(p

·"r

-Number of Motor Segments

Motor_Speed_RPM

Battery rlF with Motor

Valve Control function of Time

§]

B I' .~~ S2 TB ~-I ••• . , Gain Block I

Hydrnulic System

Simu~Jn

I ~ _ _ I

I

COmflUlt:dTorque I

;

~e

!

HYdJ"q",_;"-'k~J.

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Battery Cell Impedance

EQUIVALENT-CIRCUIT BATIERY CELL MODEL@ SOC=i

o 1 Battery SO\,l.r:~e.l)l1p.~<J.a.I1~~ . . .

,

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Model: Z_EQCK T_Cell, Rlinid: tr~n_fune, Case: I, Display: ],30-1 AN-200 I, 15:06:53

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--EPD&C Source Impedance

EPD&C WITH EQUIVALENT-CIRCUIT BATIERY MODEL

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Model: Impedance. Runid: lranJunc, Case: I, Display: ). OJ-fEB-200], 16:1 1:38

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- . ----

--EPD&C EASY5 Simulation

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°

80 }: ₆₀_: 0.. 0 n! 40; E ?. 20 : I ~ 0 _O_· ~ -20 0 2000 .

Hydraulic Load Dynamics EPD&C Modeling ___ •• _\ ._ -_ . - _ P-___ • \ ... _ _.... - --- .- _-. --! ; o' I _. 1 ____ ••• _ ! 0.4 0,4 . .. --~ .. -i . . _ . !

'

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,\i1odcl: EAPU_PDSfL T, Runid: simulation, Case: I, Display: 1. 19·JAN-2001, 12:2J:05

Hydraulic Load Simulation

• A n1etering valve controls valve

flow area

• System flow and pressure

command pun1p displacement

• Battery, EPD&C and Motor

react to pump torque changes

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..

U -;;1 EO o ... 285 280 o -I-._. 0.4

EPD&C EASY5 Simulation

EPD&C Response to Hydraulic Load Variations

EPD&C Modeling

I rooll.c.ll. Voila~.

• Oallery_Oulpul_ VoltAge

! t l'll( iHpl.1 ''" 1.1"',.... 5

~

4 {

f\r..--.-

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I ~ ] r U ' o Cl. \.L.I ci. o , ..., . EPD&C Modeling - -t.

TOlal_ Voll<lse Drop

EPOC_ VollaBe_O",p

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HDE'NG' L-. _ _ _ _ _

.

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Conclusion

• EPD&C Modeling approach is discussed

• Status of model development and analysis examples

are reported

• Model build-up continues

-

Additional power control algorithm and power distribution

hardware dynamics will be added to the model

• Transient, stability and abnormal conditions will be

analyzed

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