SuperHarm® Software for Harmonic Modeling and Simulation

SuperHarm evaluates harmonics on electric power systems. SuperHarm enables you to develop a computer model of a power system to explore variations on system loads and configurations, along with the resulting impact on system frequency response and distortion levels.

What SuperHarm Models

SuperHarm includes a wide variety of device and source models, such as

  • generic harmonic voltage and current source models
  • three-phase equivalent model
  • simple single and three-phase RL branch models
  • capacitor model
  • long line corrected pi model
  • mutually-coupled, multi-phase transmission line model
  • induction and synchronous machine models
  • advanced load model

SuperHarm can solve both balanced and unbalanced three-phase systems. This is accomplished by using phase domain nodal admittance matrix techniques rather than sequence component solution methods.

SuperHarm 1

How SuperHarm Works

The solution engine reads a user-created text file that describes the system to be simulated. SuperHarm’s Circuit Description Language (CDL) consists of keywords representing device models as well as control commands. The devices are “connected” together by specifying alphanumeric names for the power system buses.

The solution engine reads the CDL file and converts into a binary form. After checking for errors, the solver calculates the nodal admittance matrix of the system for the first frequency to be solved. The resulting matrix is factored using LDU decomposition and a voltage solution vector is obtained by forward and backward substitution using the driving current vector. The solution vector is saved to the output file and the process is repeated for all requested frequencies.

The CDL syntax allows you to develop libraries of device and subsystem models. These models can have calling parameters and internal pre-processing formulas to facilitate the entry of nameplate data. The CDL, coupled with the SuperHarm front end, provides facilities for batch solutions of many cases with varying parameters.

The harmonic-producing load models allow you to enter either typical worst-case or actual measured data for the harmonic current injections. SuperHarm automatically scales this data to match the normal system conditions at the fundamental frequency.

SuperHarm utilizes TOP, The Output Processor® to visualize the simulation results. TOP takes advantage of the Microsoft® Windows® Graphical User Interface and clipboard to allow you to easily transfer data to programs such as Microsoft® Excel and Microsoft® Word.

TOP reads the resulting voltage solution vector file and manipulates, visualizes, and prints the results. Outputs available from TOP include

  • Waveform & Spectrum Plots
  • Frequency Response Plots
  • Summary Tables (including IEEE Std 519 application)
  • Summary Bar/Column Charts
  • Cumulative Probability Plots
  • Probability Density Charts

SuperHarm 2

SuperHarm uses state-of-the-art modeling and solution methods to ensure efficient operation on personal computers. Sparse matrix techniques are utilized to minimize solution times and storage requirements.

Support Options

Electrotek Concepts® provides support for SuperHarm through PQSoft® Support Service, a comprehensive support offering for power system simulation and analytical tools. Features include upgrades, specialized models, and online resources. To learn more, send e-mail or call 865-470-9222.

Pricing and Availability

SuperHarm can be purchased directly from Electrotek. Pricing for network licenses, multi-user installations, and support options is quoted upon request. For more information, please send e-mail to or call 865-470-9222.


Download the SuperHarm brochure in Adobe PDF format

SuperHarm Device Models:

Induction Motor
Synchronous Machine
ZYC Matric

“SuperHarm”, “TOP, The Output Processor” and “PQSoft” are registered trademarks of
Electrotek Concepts, Inc.
“Electrotek Concepts” is a registered service mark of Electrotek Concepts, Inc.
“Microsoft” and “Windows” are registered trademarks of Microsoft Corporation

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