Dispatcher Power Flow

Design Features

PRISM/BSI Dispatcher Power Flow (DPF) software is part of the EMS software suite.  It can be executed either in real-time or in off-line study mode.  Through the PRISM Graphical Operator Interface, the user can specify what case is to be evaluated.  These can be either the real-time data, a set of previously saved cases, data input manually or imported through a file.


DPF supports three load flow solution algorithms: 

  • Full Newton-Raphson solution
  • Fast Decoupled Solution
  • Gaussian Solution 


All three solutions are available at all times, employ the same database and user dialogue, and can be used interchangeably.  DPF provides a full set of tools for quick creation of operating scenarios in the study mode.


All DPF solution algorithms support the following features:

  • Transformer and generator adjustment to control voltage at local or remote buses
  • Switched reactive power devices adjusted to hold a scheduled voltage
  • Two-terminal and multi-terminal DC transmission lines
  • Interchange control between areas
  • Limit checking and violation alarming of branch flows and bus voltages


Power Flow modules are supported by a number of display facilities, each dedicated to a particular application in the control center environment: 

  • All system voltages and power flows can be compared to specified limits; PRISM/BSI SecureSuite will alarm any values, which violate their assigned limits.
  • All system operating quantities can be transferred to the PRISM Interface module, from which they can be accessed by the standard Operator Interface.
  • Summary reports are available for individual buses, for specified groups of buses, or for the entire system.
  • On an area or island basis, DPF can display summary information that shows the characteristics of subdivisions of the power system.