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Power and Control Systems Engineering


Research Areas:

Control Systems

Electrical Machines

Power Electronics

Power System Dynamics


School of Electrical & Electronic Engineering

Room N107

Engineering North Building





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PSDG contribution to the IEEE Benchmark Systems for Stability Controls Task Force (Revision 3)

The Task Force is producing a suite of power system models that can be employed for the purpose of benchmarking the dynamic performance of stabilizing control systems.


The Power Systems Dynamics Group (PSDG) has developed and contributed to the task force a test system which can be used as a test bed for the small-signal analysis and design of power system stabilisers (PSSs) and other controllers in a multi-machine power system. A report on the test system and its application is provided.


Data and results for the test system are provided.

NOTE: The report, data and results provided in this web-page are for revision three of the test system and supercedes earlier versions.



Frequently papers are published in which the performance of PSSs designed using 'advanced' methods is compared to that of PSSs designed using so-called 'conventional' techniques. More often than not, the latter design does not represent a properly-designed 'conventional' PSS. In the report a basis for such a 'conventional' PSS design is outlined and its performance demonstrated. It is used in practice by a number of organisations.


An important aspect of the design of PSSs for use on practical systems is that PSSs should contribute to the damping of inter-area, local-area and intra-station modes. This aspect is seldom tested adequately in most 'advanced' design methods because:

  • a single-machine infinite-bus test system is typically employed by the proponent; it does not reveal the damping performance of the proposed PSS over the full range of modal frequencies likely to be encountered in practice, i.e. from the low frequency inter-area modes (~1.5 rad/s) to the higher local / intra-station frequencies (12+ rad/s);
  • the contributions to modal damping by the proposed PSS are not validated over a wide range of operating conditions encountered in practice, light to peak load, for normal and contingency operation, etc.;
  • the models of AVR/excitation systems employed in the proponent’s system are often very simple. In practice such models may be third or higher order.

For designs of advanced PSSs to be credible for practical application, the proponents should demonstrate the above issues have been adequately addressed.


An aim of the 14-generator test system is to provide researchers and developers with a system possessing the features highlighted above, i.e. a range of modal frequencies, a range of operating conditions, and higher-order avr/excitation system models.


The generators in the 14-machine system are in fact equivalent generators each representing a power station (PS) of 2 to 12 units. While the generators in each station could have been individually represented, this adds an additional level of complexity and increases system size, moreover, it is not warranted for the primary purpose of the report.

Test System Data

Included in Appendix I of the report is a complete set of data that allows an interested party

  1. to replicate the results provided using that party’s loadflow and small- signal dynamics analysis packages;
  2. to cross-check results obtained by the party with those presented in the report;
  3. to insert in a Matlab (TM) environment the party’s own controller, etc., into the power system for the analysis being conducted for research purposes.

To facilitate the use of the test system the following data is available for download.

  1. The loadflow data for the system in Siemens PSS/E (version 29) raw data format. Data is provided for each of the six operating conditions analysed in the report. The loadflow file names take the form LF_Case0#_R3_S.raw and LF_Case0#_R3_S_Report.dat, respectively, where # is the case number, 1 to 6.

  2. The system data (dynamics & loadflow) which is tabulated in the report is also provided in ASCII text format. (See ReadMe_Text_Data_Files.txt for further information)

  3. The linearized state-space model of the system together with the associated eigenvalues, eigenvectors and participation factors in Matlab (TM) format. The state-space model and associated eigenanalysis results, which were calculated using the Mudpack small-signal stability analysis package, are provided for Cases 1 and 6, (i) with all PSSs out-of-service, and (ii) with all PSSs in service.
    • The state-space models of the system are in the files Case#_PSSs_Off_ABCD_Rev3_Matlab.mat (All PSSs out-of-service) and Case#_PSSs_On_ABCD_Rev3_Matlab.mat (All PSSs in-service)
    • The corresponding eigenanalysis results are in the files Case#_PSSs_Off_Eigs_Rev3_Matlab.mat and Case#_PSSs_On_Eigs_Rev3_Matlab.mat
    where # is the case number, 1 or 6. The contents of the Matlab files is described in the Readme_Matlab_Files.pdf file contained in