This slide presentation reviews the use of Electrical Power Distribution and Control (EPD&C) Modeling and how  modeling can support analysis. The presentation discusses using the EASY5 model to simulate and analyze the Space Shuttle Electric Auxiliary Power Unit. Diagrams of the model schematics are included, as well as graphs of the battery cell  impedance, hydraulic load dynamics, and EPD&C response to hydraulic load variations

Fu, Johnny S.

Liffring, Mark

Mehdi, Ishaque S.

NASA Technical Reports Server

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 
DDE/NC · 
o 
'-' 
"-
. '" 
""0) 
"-
'" o 
o 
~ 
---'0 
z 
~ 
'-' 
o 
0) 
'"Ij 
:> ;:.-. 
'" ,
'-' 
-1 
...... 
'-' 
W 
<:0 
o 
o 
(f] 
tTl 
~ 
r-' 
tTl 
(f] 
H 
>-l 
tTl 
o 
o 
~ 
i§2 
I§l 
o 
o 
'" 
_J 
https://ntrs.nasa.gov/search.jsp?R=20100036847 2019-08-30T12:44:34+00:00Z
c-
r 
Space Power Workshop 
Electrical Power Distribution & Control 
Modeling & Analysis 
Dr. S. Johnny Fu 
Mark Liffring 
lshaque S. Mehdi 
Boeing Phantom Works 
HDE/NC' 
o 
'--' 
"-
N 
: Ol 
"-
N 
o 
o 
~ 
,... 
(3 
·z 
~ 
'--' 
o 
Ol 
'Tj 
:> 
H 
N 
~ 
'--' 
:::: I 
'--' I 
'--' I 
<:0 I g I 
VI 
tr:I 
:> 
~ 
l' 
tr:I 
VI 
H 
>-l 
tr:I 
() 
o 
a:: 
~ 
[§I 
o 
o 
N 
I 
I 
j 
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 
HDE'NG · 
o 
w 
"-
•• 1\:) 
. ~ 
"-
I\:) 
o 
o 
...... 
~ 
o 
...... 
w 
o 
~ 
'"1j 
;> 
H 
I\:) 
<:.II 
W 
.... 
-. 
w 
w 
CD 
o 
o 
t/) 
tr:I 
~ 
t-' 
tTl 
t/) 
H 
>-3 
trl 
o 
o 
s:: 
s:: 
i J 
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 
HDE/NG' 
0 
'-' 
"" .N 
- <:Xl 
"" N 
0 
0 
...... 
s:: 
0 
z 
...... 
'-' 
0 
<:Xl 
'Tl 
:> 
~ 
N 
<J. 
w 
- I 
-J 
'-' 
w 
to 
0 
0 
Ul 
tr1 
~ 
l' 
tr1 
Ul 
H 
>-'l 
tr1 
() 
0 
s:: 
s:: 
I§l 
o 
o 
""" 
I 
I 
I 
I 
I 
I 
I 
I 
I 
I 
-- - - - -------
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 
DOE'NC ' 
o 
w 
,"-
N 
O'J 
"-
N 
o 
o 
f-
E::: 
o 
z 
f-
W 
o 
O'J 
'T) 
;.. 
~ 
N 
c:.n 
w 
-l 
-l 
W 
W 
to 
o 
o 
(J) 
tTl ;.-
:::i 
r 
m 
(J) 
H 
>-3 
m 
(') 
o 
:=:; 
E::: 
[§J 
o 
o 
c:.n 
'---' 
Electrical Power Distribution & Control 
Space Shuttle Electric Auxiliary Power Unit 
Electric Auxiliary Power Unit 
,I tl l lI l' II ' l l lIt u \ u .ttll \ 1t II U t ' II I I I II , U .. U U ,U I I II . I " I I I U l ll l n 11 1U ' t l l1 l l, .. . 1' 111 1111 11 \ 1' . 1IU .. '1 11 ' l i t II,,, , ,U l it 1I 11f 1.,1I 1r . , 11 111 " , nltll l l l l l l 11 U H I , . I II 
270 VOC 
Battery 
EPD&C 
EHDU 
(E ~ec t ro- Hydraul i<: Drive Unit) 
~ 11111 111 11111 If 11111111 If 111I H II 
I 
I 
I 
, 
Motor 
Drive & 
Controtle 
Motor( , 
, 
, 
Hydrauli 
System 
J . 1 ..... I I . ... I I'1I 1IU. " .... " . I .. ' 
1 
, 
I 
r 
1 , 
11111111111111111111111 Jr 1111111)) ~ 
Cooling 
System 
I , h i .. "" 11111 " " 11.14 " ' 11 11 ' 1 ' 11 1 ' II nut ' . ' U ' UIl Il I U 111 .U • • I II I " "II . ~u .11 1 . ,1 . 111 ' " ", " • • 11 It 11 , 1 11 ' " '' , II " f11 11 ' I1 ' U "u, I It ' U ' 14 11 11 1 "' " ,. 11 ' II ' " "1 " t it I . .. .. " ' ' ' , II I ' I I IU ' . 11. 1., ,, H it . 
HDE~N& ' 
o 
"-' 
"-
. 1\:) 
~OJ 
"-
I\:) 
o 
o 
,.... 
is; 
o 
,.... 
"-' 
o 
~1 
'"Ij 
;> 
~ 
I\:) 
v i 
"-' 
- I 
-l 
"-' 
"-' 
<:0 
o 
o 
(f) 
tIl 
;> 
~ 
~ 
(f) 
H 
t-3 
tIl 
(") 
o 
is; 
;;::: 
I§I 
o 
o 
OJ 
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·, \ , I ' .., 
1"'\ , 
' \ ~- " 
Advanced 
Modeling 
Libraries 
Aeros pa ce Veh icle 
E'ectric Drive 
LC. Engine 
MuJtipha~e Fluid 
Powertrarn 
Thermar Hydraulic 
Thermal Pneumatic 
Valve / Actuator 
tAU ~...,..._,,_ . ,.U . _ ., c> j@jaUiaO, ,-
BOEING ' 
o 
w 
....... 
tv 
'0) 
....... 
I'\:) 
o 
o 
...... 
~ 
o 
z 
...... 
w 
o 
- I 
"Ij 
:> 
~ 
I'\:) 
U1 
W 
-I 
- 1 
W 
W 
to 
o 
o 
{/.l 
tt:I 
:> 
:::l 
~ 
{/.l 
H 
>-3 
trl 
(') 
o 
'~ ~ 
[§J 
o 
o 
- 1 
• 
• 
• 
• 
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. 
HOEINC ' 
o 
'-' 
'-
", f\:) 
" Ol 
"'-
f\:) 
o 
o 
I--' 
.... 
o 
I--' 
'-' 
o 
-1 
"Tl 
>-H 
f\:) 
VI 
'-' 
-1 
-1 
'-' 
w 
a:> 
o 
o 
VI 
trl 
>-~ 
t"' 
trl 
VI 
H 
>-j 
trl 
(") 
o 
:::: 
:::: 
[§I 
o 
o 
co 
, 
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____ .~ - --------~-----~- -.---------~-~ 
o 
w 
." , N 
Cl 
" N 
o 
o 
I--' 
a:: 
o 
z 
I--' 
W 
o 
GIl 
'Tl 
;> 
~ 
N 
"" W 
-l 
-l 
W 
w 
(D 
o 
o 
Ul 
tr:l 
;> 
~ 
r-' 
tt1 
Ul 
H 
>-j 
tt1 
() 
o 
s:: 
i:O:: 
[§I 
o 
o 
(D 
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 
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 rivative (Approx) 
\Yv4 
S2 DV4 
7.804e-7s ~ CR,c_JS2DVS -:M 
! :':DC_lnpm_ VOIW ! ~PDc_ompu,_ 
I 
t 
DV6 
7,48e-6s 
, 
I 
.----_ .. GNl~ 
l 
S2DV6 
~,--------------------~ 
~M-- GNtf 
~DU_I "PU'_ Volla&, 
------~!----------------~ I 
; 
\ 
T 
__ I~® _/(D 
- I - \ 
DDE/NG' 
. , 
0 
w 
....... 
; '" 
0) 
....... 
'" 0 
0 
I-" 
t'S: 
0 
Z 
I-" 
W 
0 
CD 
'"Ij 
;,> 
~ 
'" VI 
W 
--l 
-1 
W 
W 
(D 
0 
0 
Vl 
trJ 
;,> 
~ 
l' 
tJj 
Vl 
I-i 
>-j 
tJj 
(") 
o 
s:: 
~ 
[§l 
o 
f-" 
f-" 
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 
. r-9~- I ! I f --. 111 !III 
/t:.: ; I = ; I = : • /!II 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. I 
DDE"NG' 
. , 
a 
u 
.'-
' N 
o:l 
'-
N 
0 
a 
,.... 
"'" '0 
:z 
,.... 
u 
0 
<Xl 
'""Ij 
:> 
H 
N 
"'-U 
-I 
-I 
U 
U 
co 
a 
a 
(J) 
tTl 
:> 
~ 
l' 
tt1 
(J) 
....... 
>-:l 
tt1 
(J 
o 
s:: 
s:: 
[§J 
o 
,.... 
N 
Battery Cell Impedance 
EQUIVALENT-CIRCUIT BATIERY CELL MODEL@ SOC=i 
o 1 Battery SO\,l.r:~ e.l)l1p.~ <J.a.I1~~ . . . 
, ~.~~~~~_·.·t"7~: -=-~-- 1 -==.- ·-:-:--·~" _ :-7·~ · T-- .~_ . _ ·· ::t:; ·::~~:~ : ·~~~-J~\L~~]~· .. __ -:---~; 
. - .. 
i 
::r: 
S 
w..l I 0001 ; -~~;~;~;~=;~:==-~~1~~5-j~~~-~--~! 
G 
lLJ 
Q 
ur 
VI 
« 
::r: 
0.... 
I E-'\ 
0.01 
180 
0.1 10 laO 1000 
FREQ(HZ) 
i 
I E4 IE5 IE6 
0 ; ' - I .. /' .---:=:---I~ -' -
.' .. : - , ~ .--. ! ! 
. \-_. ' -~-".--.; ---~--r- .- -- , .- . , ~ 
90 
, 
. ___ _ i 
-90 . . _~: -- - ~ ~- :: -~: '==-: -:I -- ~-:: ~=~~- ~l- -~r--~j 
: : ' i ' I . 
-1&0 '. . .~ __ .--. -- .-. - .... -- - .. -. . ---- - .- - .- - . ____ __ ... _ . . _~_ _ __ ...i..... . - - --, 
-.. - _. \ 
0.01 0.1 10 100 1000 IE4 IE) I E6 
FREQ(HZ) 
Model: Z_EQCK T_Cell , Rlin id: tr~n_ fune, Case: I, Display: ] , 30-1 AN-200 I, 15:06:53 
HDE/N&' 
o 
'-' 
. ..... 
' N 
Cl 
...... 
N 
o 
o 
...... 
is: 
o 
z 
...... 
<..> 
o 
co 
"'!j 
> H 
N 
,,11 
'-' 
--l 
-1 
'-' 
<..> 
co 
a 
o 
Vl 
trj 
> ~ 
b; 
Vl 
H 
...., 
tTl 
o 
o 
is: 
s:: 
[§l 
o 
...... 
<..> 
r 
~ 
o 
'-' 
ll.! 
Q 
;:J 
t; 
z 
o 
< 
:2: 
G 
l1.l 
Q 
l.iJ 
VJ 
~ 
CJ... 
----------- -~--
EPD&C Source Impedance 
EPD&C WITH EQUIVALENT-CIRCUIT BATIERY MODEL 
lOO F:cI\~1 !~~t:~~~" ~E:~f: ;;:-~~:~t; •. 2,~=r:'~j 
- .. .. (48.522148.0.01 m8) ' . 1 . •• -..: '·-i::·:~·--:.-~::.i 
.. \.. . . ... - _.. . ' , 
0,01 : 
0.001 0.01 0.1 10 100 1000 l E4 lE5 JE6 
FREQ(HZ) 
180 
, I I , -
0. ' ,i ;;--- '"1'-- - i 
__ ~; ., .. ;. ; ~J/ i . \1 . _. -
_" .... ! t .-... ----
I • - -1 -' ; 
·1 - '- 1- I ... _\ . -. 
. __ I. -' - : -_. -. J . ! _ ~ _ _ I 
. --'-1-' :. -.. J-' : 
I' ... .. - I i - . 
:. \ 
10 (00 
90 
. -, 
· 1' , , 
; I i 
-1- . ·-· ----j----i 
I ! I 
.. _.+ .-. - + 
-90 
'r-
.... --., .. '-- .. . --1- -. ... - : 
._ . ...l _. 
lE5 
-\80 . 
0,001 0.01 
_ .L .. ; . -... . - .. . 
lE4 IE6 
.. 
0.1 1000 
FREQ(HZ) 
Model : Impedance . Runid : lranJunc, Case: I, Display: ) . OJ-fEB-200 ], 16 :1 1:38 
HDE/NC ' 
o 
w 
....... 
i "" 
0:> 
" 
"" o 
o 
I-' 
is: 
o 
:z 
I-' 
W 
o 
to 
~ 
;;.< 
"" v i 
W 
~l 
-I 
W 
W 
to 
o 
o 
Vl 
rrJ 
> ~ 
r' 
rrJ 
Vl 
H 
!-J 
rrJ 
() 
o 
is: 
a:: 
[§J 
o 
I-' 
"'" 
-.- --- --
EPD&C EASY5 Simulation 
0,05 
c; 
' j 0,04 
Vl . 
",I O.OJ i 
4J 
... 
<I: 1 0.02 ~ 
... 
:> 0.0 1 ' 
'" > 
0 
° 
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 . . _ . ! 
' -- -\-I: 
'. 
0.8 1,2 l,6 
TIME 
- - j 
, 
. j 
... 
0.8 1.2 1.6 
TIME 
~- I, " ''''- - -.. .j- . 
! , 
'2 
2 
~ 1600 . -I - -. -'-1--- ..... - ---~-\ --.- --- r .. ' 
' - - .... [ - _ .-1-·E' 12
00 1
' .- ._-- _ • __ • • 
1.)1 I \ ___ . _. . -- - -,-- _ I __ , 
5- 800 ,---- - --- .. :... . . . i ' _ 1\ f\~~--- . 
... I I .... . I ~I 1\0°1 ' i' +" '-'1' -- _ ~ O . I .... 
:r: ! '8 1.2 
-400 : 0~4 0, 1.6 2 
TtME 
,\i1odcl : EAPU _PDSfL T, Runid : s imulation, 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 
HOEING ' 
o 
w 
." 
' N 
'" ',-
N 
o 
o 
...... 
~ 
o 
z 
...... 
w 
o 
co 
'Tl 
> ~ 
N 
'" w 
-.] 
- 1 
W 
w 
co 
o 
o 
I.f) . 
trl 
~ 
bj 
I.f) 
..... 
...., 
trl 
(') 
o 
~ 
~ 
[§I 
o 
...... 
'-1' 
r 
JIO 
E: )05 
I g -------
c... 
'.u 
u 
t£) 
~ JOO 
<5 
> 
<'3 
0. 
;3 
o 
; 295 C 
u 
t:: 
" ~
u 
00 
~ 
-0 290 :· 
> , 
.. 
U 
-;;1 
EO 
o 
..... 285 
280 
o 
-I- ._. 
0.4 
EPD&C EASY5 Simulation 
EPD&C Response to Hydraulic Load Variations 
EPD&C Mode ling 
I rool l. c.l l. Voila~. 
• Oallery_Oulpul_ VoltAge 
! t l'll ( iHpl.1 ' '" 1. 1"' ,.... 
5 
~ 4 { f\r..--.-~ ~ 
I I . . 
, V , J 
I ~ ] 
r U
' 
o 
Cl. 
\.L.I 
ci. 
o , 
..., . 
EPD&C Modeling 
--t. 
TOlal_ Voll<lse Drop 
EPOC_ VollaBe_O",p 
~2 ' '\ 
~ I ~, : I f 1 __ \ _ . __ ._ .. _; .. ___ _ .., ?: ' ! - - __ .. __ . _ _ -: 
-\ I! ---- !- --Jr ~
, 
" -"-r -- . - --- _ ... 
O. S 1.2 1.6 2 , 0:8 o 0.4 o 1. 2 1.6 2 
TI ME TI ME 
Model : Ei\PU _ PDS_~·LT , Runid: s imuJalion , Case: J, Disp lay: J . 19-JAN ·200 1, 12:2) :05 Mod el: EAPU_P OSJLT, Runid : simula li on, Case: I, Display : 7. 19-1AN-2001. 12:23 :0 
HDE'NG' 
L-. ____ _ 
.. 
0 
w 
" ; " 
0> 
" 
"" 0 
0 
..... 
is: 
0 
Z 
..... 
w 
0 
a:> 
'"Ij 
:> 
~ 
"" (.11 
W 
-..) 
-..) 
w 
w 
a:> 
0 
0 
Ul 
tI1 
:> 
~ 
bj 
Ul 
H 
>-3 
tr:1 
() 
o 
is: 
is: 
[§l 
o 
..... 
0> 
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 
HOE/NC ' 
' " 
0 
"" '-
'" ; 0:> 
'-
'" 0 
0 
I-' 
is:: 
. 0 
'Z 
I-' 
"" 
0 
to 
'Tj 
>-;;.: 
'" (.1, 
"" 
-.J 
- 1 
"" 
"" to 
0 
0 
Vl 
trl 
~ 
t-"' 
trl 
Vl 
H 
>-3 
trl 
(") 
o 
.,... 
ti: 
[§J 
o 
I-' 
- 1 


Electrical Power Distribution and Control Modeling and Analysis

Abstract

Similar works

Full text

Available Versions

NASA Technical Reports Server