Software
DMS is a software product for technical management of electric power distribution networks. Its main objective is the analysis of distribution network flows, based on real-time information obtained from a SCADA system. If no SCADA is available, DMS may still be useful to study network behaviour for manually defined loads and switch states.
DMS software runs on Intel based PC connected to a SCADA system capable of sending to DMS, through LAN or other physical link, the real-time values of a selected set of measurement points and the status changes of network switches.
Network analysis functions allow to analyze a particular
network state (branch flows, voltages,...) and to simulate maneuvers
of switches. The network to be studied state can be a real network
state as it was observed in the past, or a future network state.
Network analysis consists in calculating branch currents and voltages. DMS considers 2 calculation modes:
In both modes, the user may open/close network switches with immediate update of results displayed on the screen. Branches and nodes may also be edited by a click in the diagram to modify their characteristics. This also results in immediate update of the calculation results. This procedure of interactive analysis allows for fast evaluation of problem areas and possible solutions.
The load analysis functions allow for storing and displaying load curves obtained from SCADA real time measurements, from portable recorders, imported from external files, or resulting from calculations.
DMS also builds load forecasts allowing to study the network conditions
in the forthcoming week. Actually, the forecasted load curve of
next weekday X is equal to the last 'normal' day X; where 'normal'
stands for normal feeder configuration and no holiday.
Before running the network analysis calculations, user entered estimates for loads of nodes and branches will be scaled such as to meet the real-time measurements obtained from SCADA or from portable recorders or from external source files.
The program has 4 operating modes:
This mode is used to enter and maintain the topology and technical characteristics of the network elements. Commands of this mode are contained in menu Network.
When in Visualization mode, a double-click on a branch in the diagram calls the display of load curves showing the measurements on that branch.
In Study mode, one may analyze the network state (branch flows,
voltages,...) for forecasted loads. (See network analysis below).
In Network mode, one may analyze the network state (branch flows, voltages,...) for the network state at a particular user-selected moment of the past. DMS maintains the full history of the whole network: measures, switch positions and maneuvers, etc. This allows to reproduce the network state at any moment in the past, and to analyze corresponding flows and voltages.
The DMS Data Base contains the topological description of the network and the technical characteristics of its components (R, X, etc). These data are introduced and maintained by the operator using the user-friendly graphical interface of the Microsoft Windows environment. Data import from existing Databases is foreseen. Graphical background maps can be imported from DXF files.
The network is composed of branches, defined by a node at both ends.
At each end may be defined (if they exist) a switch and ameasurement
point. One may also define a measurement point measuring the branch
load, and the locations (Beta) of the electrical center of gravity
of this load along the branch.
Dynamic data are flow- and load measurements and switch positions. When DMS is connected to the SCADA system through a LAN, these data are obtained from real-time acquisition by SCADA, and DMS stores them in its data base. Moreover, dynamic load or measurement information may also be complemented by data originating from portable recorders (EPR).
These recorders are placed at strategic locations in the network where real-time measurements are missing. The portable recorders measure and store the load curves (from 1 day up to several weeks) which will later be uploaded in the DMS database as statistical values for the missing real-time load measurements. Measurement data may also be imported from coma- or space delimited ASCII files.
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