Harmonic Frequency Scan

Harmonic Frequency Scan Analysis

The ETAP Harmonic Frequency Scan module calculates and plots the magnitudes and phase angles of bus driving point impedance over a frequency range specified by the user.

This allows any parallel resonance condition and its resonance frequency can be clearly identified. The study also allows users to tune their harmonic filter parameters and test the final results. The frequency range for scanning is defined by the user, which starts from the fundamental frequency and can go as high as the user needs. The impedance of elements such as cables is user-definable over the range of the frequency scan to account for the effect of especial cable physical constructions.

The results from the harmonic frequency scan study are reported in reports which includes the system input data, and a tabulation listing bus driving point impedances. The same tabulated information is also given on the one-line diagram, as well as in a plot format.

Harmonic Frequency Scan Software Key Features

Identify resonance conditions
Report resonance frequencies and magnitudes
Same system and component modeling capabilities for harmonic load flow and fundamental load flow
Built-in harmonic filters in different types
Automatic harmonic filter sizing based on different criteria
User-definable harmonic frequency scan range and step
User-customizable plots
User-definable cable impedance for all harmonic frequencies (designed for marine cable applications)

Benefits & Capabilities

Slider bar to display bus driving point impedance magnitude and phase angle at selected frequencies
Graphic plots of bus driving point impedance in ohms for viewing and printing
Graphic plots of bus driving point impedance phase angle for viewing and printing
Text report for input data, fundamental load flow results, tabulated bus driving point impedance magnitudes and phase angles
Modeling of frequency dependency of rotary machine impedance
Modeling of nonlinearity and frequency dependency of cable/line and transformer impedance and conductor skin effect
Modeling of frequency dependency of other power system components and loads
Considers machine and transformer winding connections and grounding types
User-definable frequency range