Graphical Model Builder (GMB), example: controller
PSS®NETOMAC is designed to facilitate access to and manage any kind of information on the dynamic performance of a power system. It links up the most important methods for the analysis of dynamics of electrical networks in the time and frequency domains. You can choose between a variety of program configurations - from "Basic" to "Professional". Numerous program modules allow for this program to be adjusted to the individual requirements of each user.
The tool offers:
Simulation of electromagnetic and electromechanical transient phenomena in the time domain
Steady-state load-flow and short-circuit current calculations
Frequency range analysis
Simulation of torsional vibration systems
Reduction of passive / active networks
Interactive network training simulator
Extended user interface for the graphical input of network and controllers structures and results documentation
Data import from other planning packages, e.g. PSS
Additional formats for data export
Users benefit from:
One program for all tasks associated with the dynamic phenomena of electrical networks
Simple, intuitive operation
Modular structure for an easy approach to the software
Add-on modules for efficiency of application
Predefined model networks
Standard model libraries and user-defined model enlargement
Real-time capability for protection testing, network security calculations
Training and support
Fast response to network problems
In version 13.0 of the PSS®SINCAL platform many improvements were made to the tool PSS®NETOMAC Professional. The most important improvements at a glance:
New Eigenvalue Analysis
New Functions in the Eigenvalue Screening
Improved Support for Simulink DLLs
The most widespread tool for stability analysis is simulation method in the time domain. The simulation method is suitable for both large and small signal stability analysis. Another type of method is modal analysis in the frequency domain, which is exclusively suitable for small signal stability studies. Modal analysis, as a frequency domain approach, is also widely known as Eigenvalue Analysis.
The results of the eigenvalue analysis are stated in frequency and damping ratio per oscillation mode. A damping ratio ζ represents the inclination of the line drawn from the associated mode to the origin of the s-plane.
To provide a stable and high-performance eigenvalue analysis tool that is also suitable for large network, the new implementation is based on the latest sparse-matrix technology and also uses parallel processing extensively. The benefits of this modern technology are considerable, and the processing times are reduced by a factor of 100 (or more). For example, a complete QR calculation for 20,000 eigenvalues can be completed in 15 minutes, compared to the days required with the old NEVA.
The eigenvalue analysis runs interactively in dialog operation. The eigenvalues, or more precisely the modes, are actually determined immediately after the function is started.
After the modes have been successfully determined, the interactive analysis and evaluation is started. This automatically opens the calculation dialog box and the different options for controlling the eigenvalue analysis are shown. The diagram window with the mode distribution on the complex S plane is also opened.
The diagram contains an overview of all modes found. The dashed Zeta line drawn in the diagram separates the unproblematic modes shown in green on the left of the line from the problematic modes shown in red on the right. Simply double-clicking a mode opens a dialog box showing detailed information on the particular mode.
The results of the eigenvalue analysis can be analyzed interactively with the help of the calculation dialog box.
The Modal analysis displays the eigenvectors for the selected modes and the selected object in tabular form.
The Residues/Transfer function enables enhanced evaluations of the eigenvectors to be carried out, for example for the optimum placing of controllers to be determined. This provides both a tabular display as well as a graphical display in the form of diagrams.
The diagram page shows the selected transfer function G(s) in the form of Bode diagrams as amplitude and angle over the frequency. A Nyquist diagram is also provided which visualizes the locus of the transfer function.
Another diagram page is available which visualizes the time response of the transfer function.
The eigenvalue screening provided in PSS NETOMAC in addition to the eigenvalue analysis was enhanced with new functions in order to improve its usability. The eigenvalue screening makes it possible to obtain a simple and particularly fast assessment of eigenvalues without having to carry out any complex und time consuming calculation.
Like the eigenvalue analysis, the eigenvalue screening can be started directly via Calculate – Eigenvalues – Eigenvalue Screening. The special activation and deactivation in the calculation settings is no longer necessary. As before, the eigenvalue screening can also be carried out as part of the dynamic simulation. The provision of the eigenvalue screening results can be activated for this if required in the calculation settings under Output in the Dynamics tabs.
The S plane result diagram for eigenvalue screening is generated manually after the calculation. A filter function was added to the wizard for creating the diagram page. This enables negligible eigenvalue values to be filtered out. Improved Support for Simulink DLLs.
An enhanced processing was provided in the calculation core for those Simulink DLLs which can only be used in the simulation. A check is made directly in the calculation core whether a Simulink DLL is suitable for the load flow. If not, this is not called in the load flow iteration.
For more details please check the release notes.
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