ISLAND-PARALLEL OPERATION WITH AMF AND WITHOUT PARALLELING
2.4 True RMS measurement
This controller measures AC values based on the True RMS principle. This principle corresponds
exactly to the physical definition of alternating voltage and current effective values. Under normal
circumstances the mains voltage and current should have a pure sinusoidal waveform. However,
some nonlinear elements connected to the mains produce harmonic waveforms with frequencies of
multiples of the basic mains frequency and this may result in deformation of the voltage and/or current
waveforms. The True RMS measurement gives accurate readings of effective values not only for
pure sinusoidal waveforms, but also for deformed waveforms.
NOTE:
The harmonic deformation causes that the Power Factor of a generator working parallel with the
mains cannot reach values in a certain range around the PF 1.00. The higher the deformation, the
wider the power factor dead range. If the requested power factor is adjusted inside the dead range,
the controller cannot reach the requested value because of this fact.
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