Transcript Document
A Symmetrical Hybrid
Power Flow Controller
Jovan Bebic, P.Eng.
October 31/2003
© Copyright by J. Bebic 2003
Overview
VSC Basics
Converter Based FACTS Devices
Proposed Topology
Steady-State Operation
Reachable Sets and P- Curves
H
P
F
C
Slide
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Dynamic Control
Summary
Future Work
VSC Basics
H
P
F
C
Slide
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P
P
Q
Converter Based FACTS
Compensators
H
P
F
C
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VS X S
IS
V1V1 VM
V2
P P 0QE Q
P 0 PQ
P
V2 XR VR
IR
QB
STATCOM
UPFC
SSSC
Proposed Topology
H
P
F
C
Slide
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VS
XS
V1
V2
VM
IS
XR VR
IR
QM
HPFC
Limits and Constraints
VDC
PX
H
P
F
C
Slide
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VS X
S
V1
IS
PS
P1
VX
C DC
VM
PY
VY
V2
XR VR
IR
IM
P2
PR
BM
HPFC
VX VX max VY VY max V1 V1max
VM VM max
PX PY P1 P2 PS PR
PX PY
IS IX max IR I Y max V2 V2max
Equal Power Lines
VS
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C
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PS const
IM
V1
IS
V
IS1PRVMconst X
IPS2 const
IM IS IR
S
VY
IR
V2
V1X VVSI1 jX
VMS IS
M
VMPS V
S IS
VR
VY2 V
VjB
V
jXMR IR
R2 M
Steady-State Operation
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F
C
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IM
IM
IR
IS
IM
IS
IR
VM
V1S
ISV1 VX
V2 VV
XY
VS
VM VM
VR
YX
V1 VV
V
IR 2 VY
V2R
V
Reachable Sets
Line Parameters
Equipment Limits
&
XS , X R
VX max , I X max ; VY max , I Y max
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Line Conditions
VS , VR ,
IS , IR
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P1 , Q1 , Q2
P- Curves
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System Properties
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A system of variable structure,
with infinitely many internal
operating points, for every line
operating point.
A nonlinear control problem
Dynamic Control
Operator specifies
P1 , Q1 , Q2
H
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F
C
table lookup
P1 , Q1 , Q2
ISref , IRref
use VX , VY to control IS , IR
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Controlling the Power
Balance of Converters
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P
F
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I MPX
*
DC
v
VSvDC
iDC X S
vSed
vSeqI
PS
VX
V1
S
x
P1
*
iDC
y
x y
2
2
VS
VDC
C DC
VM
IM
PY
iSref
ISxy xy
VY
V2 X VR
IS
VM R
IR
IR
BM
HPFC
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P2
VR
PR
Summary
HPFC UPFC
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Power flow control
Improves first swing
stability margin
Topological symmetry
Able to utilize existing
shunt compensation
Future Work
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Study machine based equivalents.
Study dual topology.
Formulate “optimality” algorithms
based on “reachable sets”
algorithms.
Optimize the controller.
Apply the concept of “equal power
lines” in load flow programs.