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Harmonic suppression techniques
No.
Item
Reactor installation (FR-
1
HAL, FR-HEL)
Installation of power factor
2
improving capacitor
Transformer multi-phase
3
operation
Passive filter
4
(AC filter)
5
Active filter
72
3. Precautions for Use of the Inverter
3.2 Power supply harmonics
Install an AC reactor (FR-HAL) on the AC side of the inverter or a DC reactor (FR-HEL) on its DC side,
or install both to suppress outgoing harmonic currents.
When used with a reactor connected in series, the power factor improving correction capacitor can
absorb harmonic currents.
Use two transformers with a phase angle difference of 30° in combinations of
provide an effect corresponding to 12 pulses, reducing low-degree harmonic currents.
A capacitor and a reactor are used together to reduce impedances at specific frequencies. Harmonic
currents are expected to be absorbed greatly by using this technique.
This filter detects the current in a circuit generating a harmonic current and generates a harmonic current
equivalent to a difference between that current and a fundamental wave current to suppress the
harmonic current at the detection point. Harmonic currents are expected to be absorbed greatly by using
this technique.
Description
to Δ and Δ to Δ, to
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