Emt Dc Presentation
-
Upload
boopelectra -
Category
Documents
-
view
226 -
download
0
Transcript of Emt Dc Presentation
-
8/12/2019 Emt Dc Presentation
1/25
ECPE 6304 - ENGR 315ADVANCED COMPUTER ANALYSIS OFPOWER SYSTEM CONTROL AND POWER
ELECTRONICS TRANSIENTS
Paulo F. Ribeiro, PhD, PE
-
8/12/2019 Emt Dc Presentation
2/25
EMTDC/PSCAD (INTRODUCTION)
EMTDC (ElectroMagnetic Transients for HVDC).
Developed in 1975 by Manitoba Hydro to study the
Nelson River HVDC power system
Used extensively for many types of power simulation studies,Used in both Unix and PC systems
A more user friendly version of EMTP program
PSCAD (Power Systems Computer Aided Design)
A graphical User Interface to EMTDC
PSCAD V1 in 1988 on Apollo workstations,PSCAD V2 in 1995 on Unix systems
PSCAD V3 in 1999 for PC Windows platforms. (not available in Unix).
-
8/12/2019 Emt Dc Presentation
3/25
EMTDC/PSCAD (UNIX VERSION)
Version 2, Unix 6 Workstation computers which has license of EMTDC/PSCAD at VTCoconut, Yew, Ash, Sycamore, Pear, Peach
Your login file .cshrc should be modified to include the
path lines. These computers can be accessed by other workstation
computers by telneting, or by PCs using Xwindows software.
TELNETAssume you are using X machine which does not have the EMTDC license and want to telnet to Y machine
X:/home/ loginname > xhost Y
X:/home/ loginname > telnet Y
X:/home/ loginname > setenv DISPLAY X:0.0
Y:/home/ loginname > PSCAD &XWINDOWSA trial version of Xwindows can be downloaded from http://www.starnet.com.
There is a two hour usage limit.
-
8/12/2019 Emt Dc Presentation
4/25
EMTDC/PSCAD INTERFACE
Matlab
Excel
-
8/12/2019 Emt Dc Presentation
5/25
EMTDC STRUCTURE
Multiple Run Loop
Initialization
DSDYN
Network Solution
Interpolation
DSOUT
Runtime Communication
Write Output Files
Is run finished?
Main Time Loop
Solve for History Terms
Control of Multiple Run Optimization
Start EMTDC form DATA field or SNAPSHOT
TIME = TIME + DELT
Calculate history terms current injections for inductors,
capacitors, transformers, lines and cables
User defined master dynamics files
Solution for Node Voltages and currents using
sparsity algorithm
Interpolation algorithm, switching procedures, and
chatter removal
User defined output definition file
Bi-directional socket communication to GUI
Generation of output files for future plotting
Control of Multiple Run Optimization
-
8/12/2019 Emt Dc Presentation
6/25
-
8/12/2019 Emt Dc Presentation
7/25
PSCAD/DRAFT MODULE
Collection of components or circuits can be dragged from library paletteinto drawing canvas to assembly a circuit.
Network Components:
RLC components, Transformers with saturation, Frequency dependent
transmission lines cables, synchronous machines, induction motors with excitergovernor and turbine models, faults, breakers, surge arresters, current voltage
sources, multiple harmonic injectors
Power Electronics Components:
Thyristors, diodes, GTOs, HVDC valve group, SVS and FACTS devices
Control Blocks:
Derivative, delay, differential lag, integrator, limit, complex pole, real pole, leadlag, filter, amplifier, switch and Boolen functions
Meters:
Voltmeters, ammetters, real reactive power meters, peak detectors, phase angle and
frequency meters
-
8/12/2019 Emt Dc Presentation
8/25
PSCAD/DRAFT MODULE
The components can be rotated mirrored, selected, deselected, grouped, moved
copied, cut or pasted. The wires can be resized.
User components can be created
Subsystems
Meters to measure electrical quantitiesOutput Channels to plot measured quantities
Operator controlled inputs (slider, push button, etc.) to provide interactive control
during a simulation
Miniature Pallets for navigation
Circuit can be loaded, saved from batch pull down menu, and
can be either printed to a file in postscript format or to a printerCircuit compilation conducts a sanitary check and creates files for RUNTIME module.
If there is any warning or errors, diagnostic message pops up after compilation
-
8/12/2019 Emt Dc Presentation
9/25
PSCAD/RUNTIME MODULE
Console setting is performed from create pull down menu
plots and meters to display the monitored outputs
slider, push buttons to interactively control the inputs during the simulation run
Plots can be zoomed, scaled or resized.
Three curves into one graph and 5 graphs into one plotPlot and output time output step can be reentered
Pressing a single menu button, simulation is started. The simulation then can be paused,
single stepped, resumed or stopped.
After initialization process (reaching to a steady state, a snapshot file can be created.
Filename.out is created to document, print or analyze the results using MULTIPLOT.
Repeated simulations are created using Multiple runs featureDouble precision to avoid numerical instability
-
8/12/2019 Emt Dc Presentation
10/25
PSCAD/MULTIPLOT MODULE
This module is used for documentation and analysis of the results.Fourier Analysis
Waveform Calculator
Graph formatting and labeling
Flexible layoutFiles of Filename.out and Filename.inf are needed to plot the monitored outputs
Can be printed to a file in .ps format or a printer.
Output file can be processed using any other software once the correspondence of
each column is known.
-
8/12/2019 Emt Dc Presentation
11/25
EMTDC/TYPICAL STUDIES Find overvoltages in a power system due to a fault or breaker operation. Transformer
non-linearities (ie saturation) are a critical factor and are represented. Multiple run facilities
are often used to run hundreds of simulations to find the worst case when varying the point
on wave of the fault, type of fault, or location of the fault.
Find overvoltages in a power system due to a lightning strike. This simulation would beperformed with a very small time step (nano-seconds).
Find the harmonics generated by a SVC, HVDC link, STATCOM, machine drive (virtually
any power electronic device). Detailed models for thyristors, GTO, IGBT, diodes.. are
required, as are detailed models of the associated control systems (both analogue and digital).
Find maximum energy in a surge arrester for a given disturbance.
Tune and design control systems for maximum performance. Multiple run facilities are often
used here as well to automatically adjust gains and time constants.
-
8/12/2019 Emt Dc Presentation
12/25
EMTDC/ TYPICAL STUDIES (cont)
Investigate the Sub-Synchronous Resonance (SSR) effect when a machine and multi-mass
turbine system interacts with series compensated lines or power electronic equipment.
Controls systems can also be modified to investigate possible SSR mitigating methods.
Modeling of STATCOM or Voltage Source Converters (and detailed models of their
associated controls)
Study interactions between SVC, HVDC and other non-linear devices.
Investigate instabilities due to harmonic resonances, controls, interactions...
Investigate the pulsing effects of diesel engines and wind turbines on the electric network.
Insulation coordination.
Variable speed drives of various types including cycloconverters and transportation and ship
drives.
Industrial systems including compensation controllers, drives, electric furnaces, filters, etc.
Feeds to isolated loads.
-
8/12/2019 Emt Dc Presentation
13/25
EMTDC/PSCAD compared to EMTP
Graphical data input (Draft).
Graphical execution (Runtime).
Printing plots during simulation run.
Less set up time.
Less solution time.
Interaction with users.Initialization, snapshot files.
Switching interpolation, exact switching instant.
Chatter removal from inductive node voltage and capacitive current
by employing half step interpolation
Fortran interface for modeling network dynamic and control.
No computer expertise is required with the PSCAD interface.
-
8/12/2019 Emt Dc Presentation
14/25
-
8/12/2019 Emt Dc Presentation
15/25
-
8/12/2019 Emt Dc Presentation
16/25
-
8/12/2019 Emt Dc Presentation
17/25
-
8/12/2019 Emt Dc Presentation
18/25
-
8/12/2019 Emt Dc Presentation
19/25
-
8/12/2019 Emt Dc Presentation
20/25
-
8/12/2019 Emt Dc Presentation
21/25
6 6
GVrm
-
8/12/2019 Emt Dc Presentation
22/25
EF
W
0.0
MQOUT
Gb
Gc
Va
MTE
MEF
GVrms
Te
MTm
Ia
Ic
A
B
C
TIME
IbGa
GVrms
D-
F
+
GVrms
GTM
6.6
WOUT
A
B
C
GVrms1
Ia1
Ib1
Ic1
Ga1
Gb1
Gc1
EF1
Te1
WOUT1
GTM1
GVrms1
6.6
GVrms1
TIME
A
B
Ctrl
Ctrl=1
0.0
I
P
Va1
MEF1
D-
F
+
MQOUT1
MTm1
W1
MTE1
A
B
Ctrl
Ctrl=13Phase
RMS
MPOUT1
DG1
E f I f
Tmw
Te
Tm
A
B
C
de1
3Phase
RMS
A
B
C
Ia2
Ib2
Ic2
Ga2
Gb2
Gc2
EF2
Te2
WOUT2
GTM2
3Phase
RMS
GVrms2
GVrms2
vre1
dieselengine
w Tm
ND
QEXC
6.6
A
B
C
6.63Phase
RMS
de2
ms3
GVrms3
EF3
Te3
Ia3
Ib3
Ic3
Ga3
Gb3
Gc3GTM3
WOUT3
de3
voltageregulator
exciter
Vref
ND
Vgen
Ef If QEXC
DG3
E f I f
Tmw
Te
Tm
A
B
C
DG2
E f I f
Tmw
Te
Tm
A
B
C
DG
E f I f
Tmw
Te
Tm
A
B
C
M
EfIf
Tm w
Te
Tm
A
B
C
I
P
M1
EfIf
Tm w
Te
Tm
A
B
C
cc1
ship
prop
Tm w
p1
cc
fo
A
B
C
A
B
C
V
vre2
vre3
PSCAD/EMTDC
System
-
8/12/2019 Emt Dc Presentation
23/25
KPhi
if
*QEXCp
D +
F
- vfe
vfe ife
G1 + sT ife KPhi
*
.104
72
ND
*KPhi vae
*0.1
0
vae
Vgen
Vref D +
F
+
*.2322
D +
F
-
I
P*
2.0
if
vfrp
sTG sT1 + sT
*400
*.5
*0.001
Voltage Regulator
And
Exciter Model
-
8/12/2019 Emt Dc Presentation
24/25
*.53 D
+
F
-
QDSS
FR QDSS
NREF
*
.47
Min
DF
D
+
F+
1
sT
D
+
F-
QEXC
*
0.005234QGEN
NREFD
+
F- N
D
N/D
NREF
ND
*
7.35
sT
*
I
P ag
nnonB
+
D
+
F+
w
*
1.3
6343
FRp
Tm
514.0
Engine
And
Governor
Models
-
8/12/2019 Emt Dc Presentation
25/25
fo
X
I
*0.1666667
Low pass
ButterwthOrder = 3
Vina
Vinb
L +
L+
L+
*
.3333
P*
MIrms
MPF
ccsw
P
N
D
N/D
*
1.7
32
*
.
577
N
D
N/D
IPF
VslashA
ccsw
ABCtrl C
trl=
1
ICC
IPF
*3.0
N
D
N/D
*
R
0.47
VslashA
GVb
GVc
GVa
Vinc
ABCtrl C
trl=
1
VopVouta
Voutb
VobVoutc
Voc
ccsw
GIa GIb GIc
GVa GVb GVc
gr
R+
R+
R +
GPhm
GPhmCos
IPFm
A1 B1 C1
A2 B2 C2
PhaseDifference
*.8165
Voa
GIa
GIb
GIc
MIrmso
ABCtrl C
trl=
1
A
B
C
Vf
R=0
Cycloconverter Model
(Frequency Selected)