02-07-2013, 01:08 PM
Power System Analysis Toolbox
Power System.pdf (Size: 3.26 MB / Downloads: 94)
Introduction
This chapter provides an overview of PSAT features and a comparison with other
Matlab toolboxes for power system analysis. The outlines of this documentation
and a list of PSAT users around the world are also reported.
Overview
PSAT is a Matlab toolbox for electric power system analysis and control. The
command line version of PSAT is also GNU Octave compatible. PSAT includes
power
ow, continuation power
ow, optimal power
ow, small signal stability
analysis and time domain simulation. All operations can be assessed by means of
graphical user interfaces (GUIs) and a Simulink-based library provides an user
friendly tool for network design.
PSAT core is the power
ow routine, which also takes care of state variable
initialization. Once the power
ow has been solved, further static and/or dynamic
analysis can be performed. These routines are:
1. Continuation power
ow;
2. Optimal power
ow;
3. Small signal stability analysis;
4. Time domain simulations;
5. Phasor measurement unit (PMU) placement.
Users
PSAT is currently used in several countries. These include: Algery, Argentina,
Australia, Belgium, Brasil, Canada, Chile, China, Colombia, Costa Rica, Croatia,
Czech Republic, Egypt, El Salvador, France, Germany, Great Britain, Greece,
Guatemala, Hong Kong, India, Indonesia, Iran, Italy, Japan, Korea, Laos, Macedonia,
Malaysia, Mexico, Nederlands, New Zealand, Nigeria, Norway, Peru, Philippines,
Poland, Puerto Rico, Romania, Spain, Slovenia, South Africa, Sudan, Sweden,
Taiwan, Thailand, Turkey, Uruguay, USA, Venezuela, and Vietnam. Figure 1.2
depicts PSAT users around the world.
Loading Data
Almost all operations require that a data le is loaded. The name of this le is
always displayed in the edit text Data File of the main window. To load a le
simply double click on this edit text, or use the rst button of the tool-bar, the
menu File/Open/Data File or the shortcut <Ctr-d> when the main window is
active. The data le can be either a .m le in PSAT format or a Simulink model
created with the PSAT library.
If the source is in a dierent format supported by the PSAT format conversion
utility, rst perform the conversion in order to create the PSAT data le.
It is also possible to load results previously saved with PSAT by using the
second button from the left of the tool-bar, the menu File/Open/Saved System or
the shortcut <Ctr-y>. To allow portability across dierent computers, the .out les
used for saving system results include also the original data which can be saved in
a new .m data le. Thus, after loading saved system, all operations are allowed,
not only the visualization of results previously obtained.
Running the Program
Setting a data le does not actually load or update the component structures. To
do this, one has to run the power
ow routine, which can be launched in several
ways from the main window (e.g. by the shortcut <Ctr-p>). Refer to Chapter 4
for details. The last version of the data le is read each time the power
ow is
performed. The data are updated also in case of changes in the Simulink model
originally loaded. Thus it is not necessary to load again the le every time it is
modied.
After solving the rst power
ow, the program is ready for further analysis, such
as Continuation Power Flow (Chapter 5), Optimal Power Flow (Chapter 6), Small
Signal Stability Analysis (Chapter 7), Time Domain Simulation (Chapter 8), PMU
placement (Chapter 9), etc. Each of these procedures can be launched from the
tool-bar or the menu-bar of the main window.
Displaying Results
Results can be generally displayed in more than one way, either by means of a
graphical user interface in Matlab or as a ascii text le. For example power
ow results, or whatever is the actual solution of the power
ow equations of the
current system, can be inspected with a GUI (in the main window, look for the
menu View/Static Report or use the shortcut <Ctr-v>). Then, the GUI allows to
save the results in a text le. The small signal stability and the PMU placement
GUIs have similar behaviors. Other results requiring a graphical output, such as
continuation power
ow results, multi-objective power
ow computations or time
domain simulations, can be depicted and saved in .eps les with the plotting utilities
(in the main window, look for the menu View/Plotting Utilities or use the shortcut
<Ctr-w>). Refer to the chapters where these topics are discussed for details and
examples.