Load Flow Analysis Software for Distribution & Transmission Networks
The design tool for planners and managers responsible for the design, operation and optimisation of
electricity networks. It is widely used by electrical utilities, consultants, the mining industry (and other
industries with internal electricity networks), universities and other training institutions.
Application POWSYS analyses:
• Power Flows, Losses and Voltage Levels under various loading conditions
• Dynamic switching effects such as motor starting, generation loss etc.
• Fault currents, Voltage and Fault MVA for a three phase fault at any node
Use POWSYS to:
• Check the availability of network to
• Supply new or increased loads Optimise network configuration to minimise losses
• Predict network performance under normal & single or multiple contingency operating conditions–eg. Loss of line, transformer, generator,etc.
• Determine ability to meet motor starting demands, or to determine acceptable motor starting conditions
• Assess economics of system augmentation alternatives
Features
• Alternate algorithms for Load Flow solution:
• Newton Raphson (Fast Decoupled)
• Gauss-Seidel
• Solution from last results or from Flat Start (i.e. Start with all voltages set to nominal values)
• Transformer tap modelling includes On-load Tap Changing (OLTC) – optionally with Line Drop Compensation (LDC) settings – as well as fixed tap settings
• Line/Cable Impedance can be entered by an on-screen selection from Feeder Database with standard impedances per unit length requiring only a knowledge of feeder type and length.
• Utility program provided as standard part of the package to customise the Feeder database. Solves radial and fully meshed networks
• Dynamic switching study to assess motor starting and other dynamic changes to system loading or network configuration
• Optional data units – kVA/kW or MVA/MW; ohms or per unit (p.u.); flexible entry of load details with a choice of units
• Multiple circuits between any two nodes (up to 9 lines or transformers) and multiple loads per node Global load modifications or global sub-set modification based on load ID
System Requirements
• IBM compatible computer with Windows XP or later
• At least the minimum memory required by the operating system
• Approximately 16mb Hard disk space
• SVGA monitor
• Printer or plotter (Colour preferred)
| Program Capacity | ||
| Edition | 200 Node | 3000 Node |
| Bus/Node | 200 | 3000 |
| Sources | 40 | 300 |
| Transformers | 100 | 1500 |
| Lines/Feeders | 200 | 3000 |
| Loads | 200 | 3000 |
• Graphical display of node/bus voltage levels
• Uses set VAR Limits on generators – automatic conversion of node type from PV to PQ if limits exceeded (Gauss-Seidel solution algorithm)
• Three phase fault can be applied to any network
• Node and fault level, voltage levels and fault current flows for all or selected part of the network reported
• Graphical display of single line diagram showing flows and voltage levels for load flow, dynamic switching or fault analysis
• Tabular reports can be saved as ASCII text files that can be imported into a word processor for formatted and customised reports, or imported into a spread-sheet for further processing, graphing etc.
• Graphical display of bus voltage profile
• ASCII files for network data and device data can be completely created and edited within POWSYS or created in other applications( including Datashare’s “ViewBase” program)
• Print button on on-screen reports for instant printing of results displayed
• Optional Single Line Diagram (SLD) user interface with easy-to-use drag & drop of network component creation-drag to reshape/re-space
• Import of Load Data from external files – ASCII or industry-standard data-bases
• More Load Models supported. Now includes …
• Constant Current
• Constant Impedance
• Contact Power
• System optimisation report lists branch current flows in ascending order to aid selection of optimum open points in meshed networks
• Reports based on Area & Region identification, as well as Bus/Node list.
• Use defined limits for abnormal conditions/ Limits Exceeded reports