## Staff Answer

Feb 05, 2015 - 07:45 AM

Hello

Any Discretized Fourier Transform method would give only the integer order harmonics.

For you to get (66 Hz, 72 Hz, 78 Hz), the only way I can see is to set the FFT at 6Hz set the harmonic numbers to 256 and use the anti-aliasing filter.

Note: this requires a longer steady state run for the FFT to work properly.

Any Discretized Fourier Transform method would give only the integer order harmonics.

For you to get (66 Hz, 72 Hz, 78 Hz), the only way I can see is to set the FFT at 6Hz set the harmonic numbers to 256 and use the anti-aliasing filter.

Note: this requires a longer steady state run for the FFT to work properly.

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**George Wai, **

Software Support & Development Specialist

**Manitoba HVDC Research Centre**

a division of Manitoba Hydro International Ltd.

211 Commerce Drive | Winnipeg, Manitoba, Canada R3P 1A3

T +1 204 989 1241 | F+ 1 204 989 1277

support@pscad.com | www.hvdc.ca | www.pscad.com

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