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EMS/DMS


Operators manage the electric power systems with the purpose of a safe and optimal state of operation, taking into account varying system conditions throughout the day of operation.

To achieve this goal, a continuous monitoring of the power system is necessary by a SCADA system, which allows the acquisition of measurements along the network. The variables measured can be the power flows on the lines, the level of voltage on the nodes, the current on the lines, the outputs of generators, the states of breakers, the position of the tap changers of the transformers, etc.

The variables mentioned above are used by DMS Systems (Distribution Management), to carry out different functions such as contingency analysis, load prediction, optimum power flows, control of reactive power, voltage control, state estimation, etc.

Spin’s DMS is an advanced power system modeler and simulator, which links to SCADA systems in real time.

In this video you can see an example of running the Load Flow, SCADA conection with EMS, short circuit analisys and protection coodination.

In simulation mode, DMS only receives data from the SCADA and does not return any data. It receives SCADA data at user request, with which it can make variations to the modeling or to data received in real time to make simulations, focused on operational planning. The received variables in this mode are:

  • Active and Reactive Power of Loads.
  • Breakers Position.
  • Position of Transformers Tap.
  • Voltage of Float Nodes.
  • Generated Power by Generators
  • Active and Reactive Power consumed by Motors
  • Generated Reactives by Capacitors

Receives data periodically from SCADA. The state estimation of the unread variables by SCADA is performed by the algorithm of state estimation, load flow (where applicable, to have pseudo – readings), neural networks and other auxiliary algorithms. The results of the simulations are sent back to the SCADA. The received variables in this mode are:

  • Active and Reactive Power of the loads.
  • Breakers Position.
  • Position of the Transformers Tap.
  • Voltage on the Controlled Voltage and Float Nodes .
  • Generated Power by Generators
  • Active and Reactive Power consumed by Motors
  • Generated Reactives by Capacitors

The variables sent in this mode are:

  • Voltages (value and angle) on the PQ Nodes.
  • Currents and Powers on Lines.
  • Currents and Powers on Transformers
  • Generated Active and Reactive Power by Float Nodes
  • Estimated Active and Reactive Power on the Loads without Telemetering.

The state estimation also analyzes the measurements received from SCADA and performs an evaluation of the data quality.

As you can see in the video, DMS has two ways to use the training mode.

In the first way, a previously constructed sequence of events is simulated, where the results of the simulations are sent to SCADA. In this case, DMS is a replacement of the real network, where situations that can occur in reality can be simulated, with the security of not doing operations on the electrical infrastructure. The second way to use the training mode is to allow the instructor to make improvised changes during the training, by operating and setting elements in the DMS one-line diagram. The variables sent in this mode are:

  • Active and Reactive Power of the loads.
  • Breakers Position.
  • Position of Transform er Taps.
  • Voltage on the Controlled Voltage and Float Nodes.
  • Generated Power by Generators.
  • Active and Reactive Power consumed by Motors.
  • Reactives Generated by Capacitors
  • Voltages (value and angle) on the PQ Nodes.
  • Currents and Powers on Lines.
  • Currents and Powers on Transformers.
  • Generated Active and Reactive Power by Float Nodes.
  • Fault Currents and Voltages.

In both ways, the operator can send commands from SCADA, which affect the DMS simulation and feedback the SCADA system. The commands that can be sent from SCADA to DMS are:

  • Breakers Operation.
  • Change of transformers taps.
  • Change of dispatches in generators.
  • Data of Simulations of operation of the protection coordination system (Relay data).