Power System Dynamics, Stability, and Control (PSDSC) Research Center

About PGAz

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PGAz v.1.0 will be available soon in 2025

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• 9th May 2025 — The following updates are made:
  • Add a feature that allows users to define their own input for PSS using state and system variables, with support for wide-area input signals.
  • Start developing a POD and integrate its input signal into the control loops of IBRs operating in both GFM and GFL modes.
  • Start developing dynamic models for switches and breakers.
  • Minor improvements are made to the @Class files to enable easier handling of dynamic models.
• 8th May 2025 — Add new OPF constraints for GFL and GFM units. Start developing a feature that allows GFM units to act as slack buses, also try to develop model that can support both single and multiple slack bus configurations.
• 5th May 2025 — Develop an IBR model with a selectable control mode (grid-forming (GFM) or grid-following (GFL) mode), and verify it in PF (GFM and GFL properties), SSSA, and TS (Effects of GFM and GFL controls).
• 30th April 2025 — The following updates are made:
  • Add feature that can compute PQ injection from IBRs, including compatibility with EVs and future integration of other devices.
  • Introduce two additional methods for solving OPF, i.e., Bee Algorithm and Ant Colony Optimization for flexible system-specific optimization.
  • Improve PF, OPF, SSSA report formats, GUI interfaces, and using command-line usage.
• 26th April 2025 — PGAz demo version for small-signal stability analysis and time-domain simulation, is now released! PGAz demo is compatible with MATLAB 2024. We hope you enjoy using this demo and exploring its features. Your feedback is invaluable to us – please share your thoughts!
• 1st April 2025 — Fix bugs and prepare for the release of a new Demo version with SSSA.
• 17th March 2025 — Develop GUI for SSSA and TS.
• 7th March 2025 — Finish verifying SG, AVR, TG, PSS, and IBR models. Integrate SG, AVR, TG, PSS, and IBR into PGAz-Simulink library. Add SSSA and TS functions in PGAz GUI.
• 28th February 2025 — Model IBR in grid-following mode, add a phase-locked loop (PLL) for IBRs. Also verify PLL in SSSA and TS.
• 25th February 2025 — The following updates are made:
  • Finish verifying SG, AVR, TG, and PSS in SSSA and TS
  • Initially, develop the first-order delay for the PSS model.
  • Create a new delay @Class used for controller @Class.
  • Verify the 4th-order IBR in SSSA and TS
  • Start developing a new @Class for a symmetric fault model for TS
  • Start verifying SG, AVR, TG, IBR, and PSS models in multi-machine systems
• 22th February 2025 —Develop automatic tuning algorithms that enable users to determine optimal PSS parameters.
• 18th February 2025 — Add PSS Tyep II and initially verify in SSSA.
• 16th February 2025 — Add AVR Type I and Type II and verify them in SSSA.
• 14th February 2025 — Develop a consecutive perturbation function applied to the state/output/other variables to verify the SSSA model, observe the system's time-domain response, and perform an initial stability assessment.
• 12th February 2025 — Verify IBR model in standard test systems.
• 11th February 2025 — Incorporate dynamic model of a 4th-order IBR for SSSA and TS.
• 10th February 2025 — Add three additional numerical integration solvers (Crank-Nicolson, Adams-Bashforth, and RK45) methods for solving time-domain response.
• 10th February 2025 — Add three numerical integration solvers (Euler's, 4th-order Runge-Kutta, and ODE45 methods) for solving time-domain response.
• 8th February 2025 — Start verifying synchronous machine models, AVR, and TG and comparing with PSAT and PST.
• 4th February 2025 — Verify synchronous generator models in single-machine infinite-bus, and two-are four-machine systems.
• 29th January 2025 — Update small-signal models for 2nd, 3rd, 4th, 5th, 6th, and 8th-order synchronous generators with AVR and TG models. Enhance compatibility for integration with the PGAz-Simulink library. Generate a new @Class to analyze SSSA and work with command-line usage.
• 15th January 2025 — The following updates are made:
  • Incorporate dynamic modeling of generators and other components, and start developing the SSSA function to evaluate system dynamics and stability.
  • For OPF analysis, new constraints considering microgrid components are added.
  • Resolve existing bugs and improve the visualization of the models.
• 14th January 2025 — Initiate modeling new @Class for microgrid components such as controllable load, hydrogen electrolyzer, solar-powered rooftop load, distribution lines, and solar-powered electric vehicles.
• 12th January 2025 — Developing PGAz-Simulink library has been completed, including basic models for simulations of PFs and OPFs. PGAz now features a user-friendly interface in Simulink.
• 11th January 2025 — Tasks from 10th January 2025 have been completed. Currently verifying their correctness and checking for any errors (if any) to ensure that the conversion process is accurate and compatible.
• 10th January 2025 — Develop a script to convert the [.slx] file (PGAz-Simulink library) back into [.m] file for further analysis within the PGAz GUI interface.
• 4th January 2025 — More updates are made:
  • Initiate modeling on the DC side and converters to enable analyses using PGAz, which can account for effects on both the DC and AC sides.
  • Integrate of these models into the PGAz-Simulink library for user interface.
• 4th January 2025 — The following updates are made:
  • Utilize @Class to create the PGAz model.
  • Create a dedicated PGAz domain.
  • Create PGAz-Simulink library
  • Enable seamless connection of PGAz components in Simulink.
• 1st January 2025 — Happy New Year 2025!

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• 22nd December 2024 — Fixed bugs in PF constraints that affected results in terms of reactive power and resolved issues with the interpretability of PF results, also continue developing the PGAz Simulink library for the user interface.
• 10th December 2024 — Develop a PGAz data conversion tool to automatically transform MATPOWER data format into PGAz format, done.
• 9th December 2024 — Develop and integrate models of inverter-based resources (IBRs), including wind generators, solar photovoltaic systems, electric vehicles, and battery energy storage systems, for PF analysis.
• 4th December 2024 — Initiate the development of the PGAz library to assist users in modeling systems and their components in Simulink.
• 1st December 2024 — PGAz demo version is now released! PGAz demo is compatible with MATLAB 2024. We hope you enjoy using this demo and exploring its features. Your feedback is invaluable to us – please share your thoughts!
• 30th November 2024 — Currently fixing bugs before releasing the PGAz demo version with the PF feature. Stay tuned for the upcoming release!
• 20th November 2024 — Converting large-scale systems, including 1354_peg, 1888_rte, 3022_goc, 4917_goc, and 6515_rte from MATPOWER, into the PGAz format, followed by performing PF and OPF verification on these systems.
• Mid of November 2024 — Released PGAz Part I with PF and OPF features, enabled command-line usage for PF and OPF, fixed related bugs, and initiated the development of a custom solver with constraints for PF and OPF problems.
• End of October 2024 — Other PF and OPF bugs have been fixed.
• Mid of October 2024/2 — Verified PF and OPF against IEEE benchmark test cases successfully completed.
• Mid of October 2024/1 — The IEEE benchmark data has been converted and used to validate our PF and OPF solutions.
• October 2024 — Optimal Power Flow (OPF) was initially developed for PGAz, with both minor and major bug fixes implemented. Furthermore, ten fundamental constraints have been formulated for OPF problems, with alternative approaches provided for selecting these constraints.
• September 2024 — Various solvers have been developed to address the PF problems, and they have been successfully implemented.
• August 2024 — Power Flow (PF) was initially developed for PGAz.
• End of July 2024 — Persistent errors and bugs occurred repeatedly, causing ongoing issues.
• Mid of July 2024 — Developing a Graphical User Interface (GUI) of PGAz started here
• July 2024 — Kick off the PGAz project!