VSC Harmonic Model
VSC Harmonic Model
(OP)
I have a VSC, voltage source converter, connected to the power system. The VSC is a PWM inverter. The power supply system fixes the voltage, say 460 V, as well as the frequency 60 Hz. For harmonic studies on the power system, my view is that the VSC should be modeled as a harmonic voltage source, at each harmonic. That is different than a diode bridge rectifier used on VFD's, which are normally represented as current source at each harmonic.
I consider the model to be harmonic voltage sources because of the way that the PWM inverter operates on the fixed DC bus voltage, and also the power grid which constrains the ac voltage magnitude and frequency.
Others, however, view it as harmonic current source representation for harmonic studies.
Does anyone have experience with this?
I consider the model to be harmonic voltage sources because of the way that the PWM inverter operates on the fixed DC bus voltage, and also the power grid which constrains the ac voltage magnitude and frequency.
Others, however, view it as harmonic current source representation for harmonic studies.
Does anyone have experience with this?






RE: VSC Harmonic Model
A pure voltage (current) source model will not account for changes in output harmonic content as loading at each frequency changes.
RE: VSC Harmonic Model
RE: VSC Harmonic Model
If you model the inverter as a harmonic voltage source how do you know the magnitude of harmonics to inject?
You will want to model the carrier frequency as a distorted source voltage.
Neil