1 - Accurate
All program modules in the PSAS package are developed using the latest software
and engineering technologies. The PSAS simulation results match those of other
commercial packages when similar data are used for analysis. The PSAS power
flow module converges within a few iterations for the publicly available 8700-buses
Western Interconnected System of the United States of America.
2 - Fast
The structure of PSAS is designed to handle a large variety of system models
ranging from a few buses for small industrial plants, to thousands of buses
for large interconnected power system. The power flow solution time for the
8700-buses system is less than 5 seconds, when using a Pentium M 1.86 GHz PC
computer. The program also calculates the fault current and distribution for
every busbar of the same system in about 10 seconds using the same computer.
3 - Powerful
PSAS has advanced and powerful engines capable of performing the most complex
type of power system simulation functions that match or exceed other commerically
available software packages. Apart from the core analysis functions such as
a full featured power flow module to handle connected and split systems with
AC/DC transmission lines, short circuit study, harmonic, transient stability
and dynamic stability analysis, PSAS has many other useful and unique features
that are not available in other packages. These include penalty factor calculation,
assessing the impact of bilateral transactions, loss factors and nodal pricing
in open market power systems, fast contingency analysis, simulation of harmonic
load with unbalanced current injections, modelling the effect of common earthing
resistor in earth fault analysis, user defined control parameters in stability
simulation, automatic detection of system instability and critical fault clearance
times etc. The latest issue also incorporates the dynamic study of wind generators
for wind farm applications.
4 - Compatible
PSAS is designed to conform to IEEE and other commercial standards on modelling
and data input format. Special routines are available to convert IEEE standard
text data and PSS/E* raw data. All tabulated reports are provided in text format
which can be manipulated by the user using standard text editors.
5 - Economical
PSAS is available in different versions to match the requirements of different
users. The price of the PSAS 2000 package for Windows is US$1,000 for the 300
buses version. This is only a small fraction of the cost of other competitive
products. For the benefit of those who are interested in using the package for
non-profit purposes, a special low-priced version is now available for a limited
time at US$250. This version has all the features of the full package except
for a 120-buses capacity limit.
6 - Reliable Service and Maintenance
C & S Group has been in the engineering software and consultancy business for
almost a decade. Our staff are dedicated to the continual development and improvement
of our products and services to our clients. All PSAS products are backed up
by a free six months program maintenance and assistance via the internet and
fax. We value every customer and would do our best to meet and exceed their
expectation.
Please contact C & S Group for further information.
PSAS 2000 Updates
A governor response test module has been incorporated
in the transient stability program which can be used to study the generator
governor response under different changes in machine electrical power. The
results can be used to asess the damping performance of the governor during
disturbances.
An
induction motor starting routine using load flow method has been incorporated
in the transient stability program. The routine allows different motor starting
methods such as inserting rotor resistor, stator reactor and shunt reactors
to be evaluated.
The
plotting routine has been improved to allow multiple variables to be plotted
in the same page for each generator.
A generalised control block routine has been provided to model the response
of governor valves and prime movers of generators in the transient stability
study. Most IEEE standard governor models, which can be represented by simple
connection of first order blocks, can now be properly modelled. The program
also provides samples of IEEE standard AVR's, governors and turbines.
The R-X impedance locus trajectory can now be plotted
in the transient stability routine. Users can trace the path of the impedance
locus in each time step of the transient stability simulation.
Two terminal DC transmission lines and phase shift
transformer are now incorporated into all PSAS 2000 routines. Transaction
impact study is incorporated into the power flow program to assess the effect
of bilateral power transactions on circuit loading capability in open electricity
markets.
The generators can be modelled using transient or subtransient parameters
and an open circuit step response routine has been added to assess the generator
excitation systems in the transient stability routine.