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about cyme:
CYME’s Power Systems Analysis Framework
(PSAF) is a comprehensive suite of integrated
software programs that perform the simulations and
analyses of transmission or industrial electrical
systems as needed by the electrical engineers.
A wide selection of network equipment and
controllers is supported by a built-in database that
contains industry standard equipment
characteristics. Every type of equipment features
more than one modeling possibility depending on the
purpose and extent of the simulation to be
conducted.
PSAF offers both graphical and tabular data entry
modes, user-preferred single-line diagram drawing
options and sophisticated facilities for reporting,
plotting and customizing the simulation reports.
Deploying PSAF brings significant advantages in
performing the planning, design and problem-solving
activities related to the assessment, improvement
and maintenance of electrical power systems.
PSAF is directly applicable to both utilitytype
and industrial three-phase electric
power systems.
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Transmission & Industrial System Analysis - PSAF
- Power flow for normal operating conditions and
“what-if’ scenarios.
- Short circuit calculations and protection settings.
- Breaker ratings.
- Arc flash hazard calculations.
- Optimal power flow.
- Voltage stability/Modal analysis.
- Harmonic analysis.
- Transient stability under normal operating
conditions such as transient motor starting and
load transfer.
- System dynamics under abnormal operating
conditions such as bus fault and line tripping.
- Transmission lines parameters calculations in
sequence or phase domain, with modal analysis
and frequency-dependence modeling capability.
- Underground cable parameters calculations.
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Features and Capabilities
Dedicated to power flow analysis in three-phase electric power
networks, it is equipped with powerful analytical options and
alternative solution techniques.
CYMFLOW utilizes state of the art sparse matrix/vector methods
and multiple solution algorithms: full Newton-Raphson, fast
Decoupled (with or without constraints), and Gauss-Seidel.
Some of the CYMFLOW capabilities are:
• Analyze networks with thousands of buses and branches.
• Multiple swing buses allowed.
• Automatic swing bus selection for isolated subsystems.
• Simultaneous solution for islanded networks.
• Switchable shunt element.
• Generalized load modeling, including constant power,
impedance and current.
• Representation and control of DC lines.
• Wind Energy Conversion Systems (WECS).
• Modeling and representation of FACTS devices (UPFC and
STACOM).
• Transformer inrush currents.
• Color coding on the network one-line diagram of overloaded
equipment and buses with voltage violations.
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CYM-AC Contingency
The AC CONTINGENCY operates in conjunction with CYMFLOW, for
power flow related contingency analysis. The analytical approach
used is the same as CYMFLOW; i.e. the contingency analysis is
performed using full AC power flow solutions (no DC
approximations). The module features the sequential solution of
all contingencies in a single run.
The contingency module is structured so that an unlimited
number of “what-if” scenarios can be included in a given
contingency study. All contingency-related system modifications
refer to the base case network single outages and/or multiple
outages/modifications can be concurrently defined at will to
represent an adverse contingency analysis scenario such as:
• Modify loads globally, individually or by zone.
• Modify generation globally, individually or by zone.
• Connection and disconnection of branches.
• Shunt modification.
• Addition and removal of induction and synchronous motors.
• Connection and disconnection of buses.
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CYM-Motor Start
The CYM-Motor Start Analysis Module operates in conjunction with
CYMFLOW and is dedicated to simulating the effects of induction
and synchronous motor starting in three-phase electric power
systems. This module is a reliable and easy to use tool for
assessing system voltage dips and acceleration times of induction
motors, using a variety of starting methods.
• Induction motor starting.
• Synchronous motor starting.
• Ten starting methods supported, including soft motor start,
VFD, auto transformer, etc.
• Detailed mechanical load model based on manufacturer data
curves or with the equation of load torque versus speed.
• In the absence of detailed information, the module includes
support functions for deducing the induction motor equivalent
circuit for single rotor, double rotor or deep bar rotor induction
motors.
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CYMFLOW - Power Flow Analysis
Electrical Equipment
Parameter Estimation
PSAF is capable of suggesting typical data for the
system equipment. These estimating functions
account for a wide array of industry
manufacturing practices, and respect the
recommendations outlined in both North American
and International calculating guidelines. This
capability is very useful when detailed information
about lines or cables is not available.
Transmission line models are defined by their
geometrical line configurations. Transposed and/
or full three-phase un-transposed models
including frequency dependency are supported for
single or double circuit lines, with solid or tubular
conductors, multiple conductors per phase and
multiple neutral wires (segmented or not).
Underground cable constants are calculated
single and/or three-core cables with either sheath
or ground return.
To simulate fault conditions in three-phase electric power
systems. User-friendly data entry, a multitude of reports and
flexibility in applying all industry-accepted standards are features
that make CYMFAULT an indispensable tool for these very
common and important system studies.
CYMFAULT adheres to North American ANSI C37.5, ANSI
C37.010, ANSI C37.13 and International IEC-60909 guidelines. It
also supports conventional short-circuit studies without reference
to any particular standards.
• Series faults (one-phase open, two-phase open and threephase
series unbalance).
• Separate network reduction for ANSI X/R ratios.
• Arcing faults through user-defined fault impedance.
• Mutual coupling in zero sequence.
• Interrupting device adequacy evaluation.
• Automated sliding fault option on a transmission line and/or
cable.
• System-wide voltage, current and machine contribution
reports (phase and sequence values).
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ANSI Short-Circuit Studies
CYMFAULT adheres to North American ANSI C37.5, ANSI
C37.010, ANSI C37.13 for all duty types that are of interest to
industrial fault studies. Duty types supported include: time
delayed, contact parting, closing / latching, low voltage circuit
breaker.
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IEC Short-Circuit Studies
CYMFAULT adheres to the international IEC-60909 guidelines and
supports all four types of fault currents that are of interest to
industrial fault studies. Duty types supported include: initial
short-circuit current (I"k), maximum asymmetrical fault or peak
current (Ip), breaking fault current (Ib), steady state fault
current (Ik).
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CYMFAULT/CYMTCC Interface
CYMFAULT includes an interface module to our Protective Device
Coordination Program CYMTCC. This interface provides
CYMFAULT users with full access to the complete library of over
5000 protective devices available in the CYMTCC program.
The user simply has to define the coordination path of the feeder
on the one-line diagram of PSAF and export to CYMTCC.
CYMTCC will automatically generate the Device Time / Current
curves for any device setting adjustments along with the selected
feeder one-line diagram.
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CYMBREAK - Breaker Ratings
CYMBREAK checks the validity of the current breaker size, and is
designed to execute the appropriate simulation for high, medium
or low voltage circuit breaker according to either ANSI or IEC
standards.
The CYMBREAK engine allows the user to specify the breaker with
information such as rated voltage, short circuit currents,
temperature, etc. It is also possible to specify the breaker
configuration arrangement such as 2, 1½, ring, etc. Then it
determines if it is correctly sized in a steady state context or
during a short circuit. Based on the breaker configuration,
simulations are automatically performed on the worst system
arrangement for each performed check.
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Arc Flash Hazard
This module is primarily designed to analyze and promote the
electrical safety for employees working on or near electrical
equipment.
It computes the necessary parameters required to assess the risk
level and adopt the adequate safety procedures, and complies
with industry recognized standards and methods for performing
ARC Flash Hazard calculations namely: the Electrical Safety
Requirements for Employee Workplaces (NFPA-70E-2004) and
the Institute of Electrical and Electronic Engineers (IEEE-1584-
2002).
The module facilitates the calculation of arc flash hazards in
different types of equipment in various power systems.
The program generates reports a variety of reports including
labels that can be printed directly on ARC Flash Hazard
weatherproof warning stickers.
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CYMFAULT - Fault Analysis (ANSI & IEC)
Wind Energy Conversion Systems (WECS)
CYMSTAB now includes extensive modeling capability of Wind
Energy Conversion Systems (WECS) dynamics. The advanced
solution algorithms provide the user with the necessary tools to
carry out power system studies comprising wind farm
installations. Wind-turbine generation systems supported
include:
• WECS-IG, for induction generators directly coupled with the
AC grid.
• WECS-HVDC, for induction generators connected to the AC
grid through a Voltage-Source Converter (VSC) DC link.
• WECS-DFIG, for doubly fed induction generators, featuring
not only a direct stator connection to the AC grid but, also, a
VSC-based DC link rotor energy recovery system, for variable
turbine speed operation.
• Wind modeling, accounting for “cut-in” and “cut-off”
capability.
• Two-mass drive train turbine-generator shaft model.
• Blade pitch control.
CYMSTAB is the PSAF simulation module used to simulate
electromechanical transients in three-phase electric power
systems. It features an extensive library of equipment and
controller models, the capability to include user-defined controls,
a very flexible user-interface and powerful graphics.
CYMSTAB utilizes the simultaneous implicit trapezoidal
integration solution technique for network, machine and
controller equations. The program supports the capability to test
the step response of controllers and User Defined Modeling
(UDM) for system equipment and controllers.
CYMSTAB features a large library of pre-defined models for
network equipment and control systems that includes:
• Turbo and salient pole generators.
• IEEE excitation systems including saturation modeling.
• Power system stabilizers.
• Governor models comprising hydraulic, thermal, diesel, and
gas turbines.
• Static Var compensators.
• Under-voltage, under-frequency and frequency droop relays.
• Power swing and impedance relays.
• Induction motor models with frequency dependent modeling.
Some of the analytical capabilities of CYMSTAB are:
• LLL, L-G, LL and LL-G fault application and removal.
• Line switching and line re-closing.
• Single pole re-closing including line charging effects.
• Load shedding and load increase; generation shedding.
• Disconnection of lines, cables and transformers.
• Direct on-line or assisted induction motor starting and
stopping; synchronous motor starting.
• Possibility to vary the integration step during the simulation.
• Frequency-dependent modeling.
• Networks with multiple frequencies.
• HVDC modeling.
• Generalized load modeling at individual bus bars or
throughout the system.
• Series capacitors and controls.
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CYMSTAB - Transient Stability Analysis
Robust User Defined Modeling
In addition to its built-in library, the program
includes a comprehensive Library of User-Defined
excitation systems, governors and stabilizers.
Virtually any schematic diagram of Laplacedomain
transfer functions can be created using
our User-Defined Modeling functionality. With
UDM it is also possible to perform manoeuvres
(like stopping a motor) based on network
conditions, rather than at fixed times.
The PSAF User Defined Modeling functionality is
a robust, field-proven capability with which the
engineer can define the components of the
network and their functions with the optimum
precision that yields to more accurate simulation
results.
CYMVSTAB performs the voltage security assessment of power
systems. In planning and operating today’s stressed power
systems, the ability to maintain voltage stability has become a
growing concern. CYMVSTAB is designed to meet this challenge
by assessing the ability of the power system to maintain stable
voltages under different contingencies and loading conditions.
Power system voltage instability is related to the lack of reactive
power resources in the network. This is very similar to frequency
instability in transient stability studies for systems that do not
have sufficient spinning reserve.
Many aspects of voltage stability problems can be effectively
analyzed with the Steady state or Static Power Flow based
domain for a specified operating condition of the power system.
CYMVSTAB offers the user the same common format as our
Power Flow Program CYMFLOW for entering the network data,
defining the study parameters, report options and solving the
network.
The program assesses the voltage stability of a network by
means of the two most common static voltage stability analysis
techniques.
• P-V Analysis (P-V Curves)
• V-Q Analysis (V-Q Curves)
All curves of monitored variables can be exported to CYMVIEW,
which is capable of managing the outputs of different modules
and storing the results for any number of simulations generated
by CYMVSTAB.
Modal Analysis
In addition to the voltage stability analysis techniques, there is a
need for analytical tools capable of predicting voltage collapse in
complex networks, accurately quantifying stability margins,
power transfer limits, identifying voltage-weak points and areas
susceptible to voltage instability.
The voltage stability module CYMVSTAB can identify the
contributing factors and sensitivities which in turn provide insight
into system characteristics that are key elements for the
development of remedial actions in the network.
CYMVSTAB has the unique feature that for both PV and VQ
approaches, the modal analysis is applied at each operating point
to determine the voltage stability critical areas by identifying the
ten buses contributing most to each identified mode of
operation.
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CYMVSTAB - Voltage Stability Analysis CYMHARMO - Harmonic Analysis
CYMHARMO is designed to perform harmonic penetration
analysis in electric power systems. It features both single phase
and full three-phase modeling capabilities. It can flexibly and
easily be applied to utility-type grids, industrial power systems
and distribution feeders of any configuration.
CYMHARMO utilizes state of the art sparse matrix/vector
methods with a three-phase nodal admittance network matrix
representation.
The program obtains from CYMFLOW the fundamental frequency
current and voltage system profile for harmonic distortion
calculations and waveform display.
• Phase or sequence analysis.
• Driving point and transfer point frequency scanning analysis.
• Voltage and current harmonic distortion.
• Calculation of telephonic indices (TIF, IT, etc.).
• Sensitivity analysis.
• System equivalence.
• Noise-to-ground analysis.
• Inductive coordination analysis.
• Communication interference analysis with slanted-exposure
power circuits.
• Harmonic cancellation analysis.
• System detuning analysis.
• Capacitor stress analysis.
• Skin effect modeling. نسخه دمو این برنامه بدون کرک
CYMHARMO includes a capacitor rating module to perform the
stress analysis of all power capacitors installed in the network,
including those incorporated in filters. The analysis reports the
harmonic currents and voltages of each capacitor as well as the
total reactive power, RMS current, RMS voltage and peak
voltage. These quantities will be compared to user-defined limits
and any capacitor that violates any of those limits will be
reported and highlighted on the network one-line diagram.
CYMOPF allows the user to engage in advanced system planning
studies to optimize system performance, examine cost-efficient
operational planning alternatives, articulate system control
strategies and rationalize equipment utilization, resulting in
better overall system asset management.
CYMOPF calculates the “best possible” values for “higher level
set points” considering a set of user-specified objective
functions and a number of constraints. In this way, it adds
intelligence and, consequently, improves efficiency and
throughput of power system studies significantly.
CYMOPF relies on robust barrier-method based nonlinear
optimization techniques that permit fully coupled optimization,
with the entire set of system control variables, including
generation schedules, transformer taps, phase shifter settings,
etc. System equipment constraints are observed, in particular
bus voltages and line flows.
CYMOPF includes infeasibility handling through automatic
relaxation of immediate binding constraints and comprehensive
constraint ranking severity indicators for cases that exhibit
convergence difficulty.
CYMOPF is aptly suited in solving many problems typically found
in today’s less-regulated power markets :
• Scheduling of ancillary services for reactive power and active
power.
• Development of system reference scenarios.
• Voltage collapse analysis.
• Transfer capability investigation.
• Location based marginal cost assessment.
• Implicit penalty function consideration.
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CYMOPF - Optimal Power Flow Analysis
CYMVIEW, common to all CYME simulation modules, generates
any kind of charts. CYMVIEW is capable of managing the
outputs of the various CYME software modules:
• Real-time plotting of variables specified in user-defined
models (bar charts, curves, time waveform).
• Complete system-wide tabular reports generated with
complete echo of the data used for the simulation.
• R-X plots, sensitivity analysis plots.
• Equipotential contours in 2D and 3D.
• Capability to compare results from different simulations.
• Algebraic manipulation of plots and variables during
plotting.
• Possibility to plot multiple results on the same graph.
• Unlimited number of graphs.
• Capability to customize units, labels and plots appearances.
• Can be exported to MS Excel or to HTML format.
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CYMVIEW - Simulation Results
PSAF for
Industrial Power Systems
CYME offers a comprehensive suite of power
engineering applications well adapted for
industrial power systems with 250 buses or less.
PSAF features applications for the most common
studies and assessments involved in the design
and maintenance of power systems in industries.
Includes load flow, short-circuit, motor starting
analysis, and protective device coordination. With
more specialized tools you can perform harmonic
analysis (with full 3-phase modeling capacity) and
transient stability studies. The latter comprises
user-defined modeling capabilities allowing for
the creation of your own models for equipment,
controls, relays or special functions.
CYMTCC addresses Time Over-Current protection for Industrial,
Commercial and Distribution Power systems. The program
comes with an extensive database of over 5000 protective
devices that are easily called to produce Time-Current curve
plots and device settings reports. It also features a unique
Coordination wizard to suggest protective device settings/
adjustments and ratings. CYMTCC features a direct interface to
PSAF to verify the coordination of protective devices. It can also
be used to provide the device opening times that are used in the
Arc Flash Hazard simulation module of PSAF.
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CYMTCC - Protective Device Coordination
CYMGRD is CYME’s substation grounding grid design and
analysis module specially designed to help engineers optimize
the design of new grids and reinforce existing grids, of any
shape, by virtue of easy to use, built-in danger point evaluation
facilities . The program conforms to IEEE Std. 80-2000, Std. 81-
1983 and Std. 837-2002. The use of CYMGRD allows for the
rapid analysis of various design alternatives to choose an
economical solution for any particular installation. User-friendly
data entry, efficient analysis algorithms and powerful graphical
facilities render CYMGRD an efficient tool that helps the
engineer arrive at technically sound and economical designs.
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CYMGRD - Substation Grounding
The PSAF simulation modules are easy to use,
reliable and powerful with the most advanced
industry-proven modeling and algorithmic solution
techniques for the most demanding engineering
analyses.
PSAF offers a highly interactive graphical interface
that makes it easy to draw the network one-line
diagram on the screen and define the parameters
of its components. At any time, you may display
and edit the data pertinent to any component. You
may even have the one-line diagram drawn
automatically for you as you connect components
together.
PSAF also comprises cable and equipment
estimation programs to further enhance the
process of building a consistent network diagram
upon which realistic and reliable system studies
can be performed.
With the PSAF sophisticated facilities for reporting
and plotting, you can easily select the variables
you need and customize your simulation reports as
required. You may design custom reports by
selecting items from a menu. Undesirable load
flow conditions such as overloads and under/overvoltages
may be reported.
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Graphical and Reporting
Facilities
© Copyright CYME International, April 2006
CYME’s Electrical Analysis Software Solutions are readily available for customers’
immediate use in planning and engineering applications.
CYME engineers can also assist you in the resolution of emerging, specialized and
non-routine problems, and provide more specialized assistance and study services.
Our engineering staff is at a high degree of skill and their knowledge covers almost
every area of power system analysis. Backed by extensive experience in systems’
planning, design and operation, they provide a range of options in terms of
specialization, experience and know-how.
Specialized and sophisticated system studies to deal with new and emerging
problems in the energy sector.
• Minimizing cost and maximizing profit by operating equipment near, at, or beyond
their design limits.
• Dealing with modern customer equipment sensitive to system disturbances.
• Rationalization of cost by system planning and operation optimization.
• Assessment of system performance, its ability to meet regulation requirements,
and measures for its enhancement.
• Conduction of technical studies for system expansion and/or refurbishment
purposes and prepare equipment specifications for these purposes.
• Conduction of postmortem analyses to establish failure causes and provision of
remedial actions.
• Preparation of technical specifications for tendering purposes and reviewing
tenders.
• Provision of third party opinions in disputed matters.
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System problems with increasing importance need special analytical
studies in the following areas:
• Voltage sags and swells.
• Harmonics levels and their control.
• Flicker problems and their mitigation.
• Integration of distributed generation in power systems.
• Insulation coordination.
• Arc flash regulations.
• Grounding systems and ground potential rise.
• Voltage control and VAR flow optimization.
• System reliability and outage analysis.
• Design of protection systems and coordination of relay settings for optimum
selectivity and prompt isolation of faulty sections.
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