PSS®E

PSS®E
Name	PSS®E
Developer	Siemens PTI
Released	1970s
Latest release	(proprietary)
Operating system	Microsoft Windows
Genre	Power system analysis software
License	Proprietary

PSS®E PSS®E is a proprietary software suite for transmission planning, steady-state and dynamic analysis, and contingency evaluation used by utilities, independent system operators, and consultants. It integrates with industry practices for load flow, short-circuit, stability, and market studies and is widely employed alongside tools and institutions in the electric power sector.

Overview

PSS®E is a commercial package for power system engineers that supports load flow, contingency analysis, transient stability, and electromagnetic transient interfaces. It is used by entities such as General Electric, Siemens, ABB, National Grid plc, California Independent System Operator, PJM Interconnection, and Texas Regional Entity for planning and operations. The software interoperates with standards and data models from North American Electric Reliability Corporation, European Network of Transmission System Operators for Electricity, International Electrotechnical Commission, Institute of Electrical and Electronics Engineers, and integrates with databases and platforms like Oracle Corporation, Microsoft Corporation, SAP SE, OpenDSS, and MATLAB.

History and development

Development began in the 1970s within a context of rapid electrification and grid expansion paralleling initiatives by Bonneville Power Administration, Electric Power Research Institute, and national utilities such as Électricité de France and Tokyo Electric Power Company. Over successive decades the code base incorporated methods from seminal research by figures and institutions including Charles Concordia-era techniques, studies from Massachusetts Institute of Technology, and models used in projects by Westinghouse Electric Company and General Electric. Corporate acquisitions and reorganizations connected the product to companies like Siemens AG and research collaborations with Imperial College London, University of Illinois Urbana-Champaign, and National Renewable Energy Laboratory. Regulatory drivers from Federal Energy Regulatory Commission, Ofgem, and reliability mandates by North American Electric Reliability Corporation influenced functionality additions like contingency screening and security-constrained dispatch interfaces.

Features and capabilities

PSS®E provides core capabilities such as Newton–Raphson and Gauss–Seidel load flow solvers used in studies by Edison Electric Institute members, PV and PQ bus modeling applied by Iberdrola, and contingency analysis aligned with criteria from Federal Energy Regulatory Commission and California Public Utilities Commission. Additional modules support small-signal stability analysis used in research at National Renewable Energy Laboratory, time-domain dynamic simulation employed by PJM Interconnection planners, short-circuit calculations consistent with IEC 60909 and IEEE 141 practices, and transformer, generator, and load modeling reflecting standards from IEEE Standards Association and CIGRÉ. Interfaces and scripting support enable automation through Python (programming language), integration with MATLAB, and data exchange with GE Energy Consulting workflows and market simulation platforms used by AEMO and EPEX SPOT.

Architecture and components

The package is built around a core power system analysis engine with modular components for steady-state, dynamic, and market-related studies. Typical components include a network model database compatible with data formats used by OpenADR, contingency and security modules similar to tools from Siemens Energy and Schneider Electric, dynamic model libraries for machine and control system representations comparable to libraries developed at University of Strathclyde and Technical University of Denmark, and scripting APIs for Python automation and integration with enterprise systems from Oracle Corporation and Microsoft Corporation. Visualization and plotting capabilities interoperate with tools and libraries used by ESRI GIS products, Tableau Software dashboards, and engineering suites from Bentley Systems.

Applications and use cases

PSS®E is applied in transmission planning by organizations like National Grid plc and ENEL, operational planning at California Independent System Operator and PJM Interconnection, interconnection studies for wind and solar projects by Ørsted, Vestas, and First Solar, and academic research at Massachusetts Institute of Technology, Imperial College London, and ETH Zurich. It supports blackout and disturbance investigation workflows similar to analyses of the Northeast Blackout of 2003 and studies following events involving utilities such as Con Edison and PG&E. Market participants and system operators use it for reliability assessments tied to FERC Order 888-era market reforms and capacity expansion studies informing policy discussions involving European Commission and national regulators.

Licensing, distribution, and support

PSS®E is distributed under a proprietary license by Siemens PTI with commercial support, training, and maintenance agreements offered to utilities, consultants, and research institutions including Siemens AG, GE Grid Solutions, and university power systems departments at University of Illinois Urbana-Champaign and Rensselaer Polytechnic Institute. Licensing models typically include node-locked or floating licenses and enterprise agreements comparable to commercial software procurement processes used by Iberdrola and EDF. Vendor support encompasses technical assistance, model library updates, and application engineering similar to services provided by Schneider Electric and ABB.

Category:Power system analysis software