Contact Us





DSA Tools





Current version of DSA Tools is 13

The DSAToolsTM suite is the next-generation of power system analysis tools and provides the complete assessment of system security including all forms of stability.

The DSAToolsTM provide a complete toolset for power system planning and operational studies. In additon to rich modeling capabilities and leading-edge computational methods, the software is highly automated and can provide engineers with significant productivity improvements.





PSATTM (PowerFlow & Short Circuit Assessment Tool) is a full-featured graphical powerflow program that includes table-driven data manipulation and a flexible one-line diagram capability. It can be used for stand-alone powerflow analysis or for data exchange with the other DSAToolsTM products.


  • Creating and modifying powerflow models
  • Contingency assessment including overload and voltage studies
  • Producing diagrams for output reports
  • Setting up initial conditions for other DSATools applications


VSATTM (Voltage Security Assessment Tool) is a highly automated steady-state analysis tool designed for comprehensive voltage security assessment. VSAT includes flexible specification of voltage security criteria and is designed to handle a large number of contingencies, power transfers, and scenario


  • Reactive power planning studies
  • Operational planning studies (security limit assessment)
  • On-line voltage security assessment
  • Any analysis involving, Assessment of thermal overloads Determination of voltage security limits Evaluation of required voltage stability margins Transfer limits (ATC & TTC)
                                    [ Click here ]




TSATTM (Transient Security Assessment Tool) is a leading-edge full time-domain simulation tool designed for comprehensive assessment of dynamic behavior of complex power systems. TSAT includes a rich model library, state-of-the-art solvers, and a highly intuitive user interface. Like VSAT and SSAT, TSAT can automatically find security limits under specified contingencies and transfer conditions. 


  • Studies involving rotor angle, voltage, or frequency stability
  • Transmission system design and operating studies including stability limit assessments
  • IPP integration studies
  • Design and setpoint determination of special protection systems
  • Control tuning and protection coordination

[ Click here ]

SSATTM (Small Sgnal Analysis Tool) is an eigenvalue-based software tool designed for analysis of small signal stability of large complex power systems. It includes a wide number of analysis functions and productivity tools, making it ideal for investigating oscillatory behavior, and for designing and tuning controls to improve system damping.

  • Studies of low-frequency inter-area oscillations
  • Analysis of local or inter-machine modes of oscillations
  • Design and tuning of controls
  • Investigation of the sensitivity of system parameters on modes of oscillations
  • Contingencies screening to meet damping requirement
  • Determination of power transfer limit to meet damping requirement
                                      [ Click here ]




Powertech's on-line DSA technology is used with the Wind Security Assessment Tool (WSAT), in a joint development with the Irish national grid company EirGrid. WSAT is now operational at the National Control Center (NCC) of EirGrid.

                                       [ Click here ]
CDTTM (Control Design Toolbox) is a specialized software tool for tuning power system stabilizers. CDT works with Matlab and SSAT to provide advanced tuning and benchmarking capabilities and is available as a stand-alone tool or as an add-on module to SSAT.

                                       [ Click here ]

Online Application Power System Security Assessment
SecurityAssessment in Near-Real Time:

The DSAToolsTM are designed to provide on-line security assessment when used in the real-time sequence of the control center's energy management system (EMS). The software works with a solved powerflow provided by the state-estimator and communicates with the EMS via flat files or TCP/IP network connection. Powertech's DSAManagerTM controls all computations which are conducted on a dedicated cluster of computers and, if necessary, distributed processing is used to meet performance requirements. Results may be passed back to the EMS console or are accessible locally or remotely.



Copyright 2012 Nayak Power Systems Pvt. Ltd.