Fuji Electric ALPHA7, User Manual

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CHAPTER 15 STANDARDS COMPLIANCE
Complying with "Guideline for Suppressing Harmonics by Customers Receiving High Voltage or
Special High Voltage"
15-13
15
Generally speaking, harmonic current is calculated using "Table 3 Three-phase bridge (capacitor
smoothing)" in "Guidelines - Appendix 2". Refer to Table15.4-4 for the guidelines appendices.
Table15.4-4 Amount of harmonic current generation (%), three-phase bridge (capacitor smoothing)
Degree 5th 7th 11th 13th 17th 19th 23rd 25rd
No reactor used 65 41 8.5 7.7 4.3 3.1 2.6 1.8
Reactor used (AC side) 38 14.5 7.4 3.4 3.2 1.9 1.7 1.3
Reactor used (DC side) 30 13 8.4 5.0 4.7 3.2 3.0 2.2
Reactor used (AC, DC side) 28 9.1 7.2 4.1 3.2 2.4 1.6 1.4

AC side reactor: 3%

DC side reactor: Stored energy is equivalent to 0.08 to 0.15 ms (100% load conversion)

Smoothing capacitor: Stored energy is equivalent to 15 to 30 ms (100% load conversion)

Load: 100%
The harmonic current for each degree is obtained as follows.
nth degree
harmonic
current (A)
=
fundamental
harmonic
current (A)
x
Amount of nth degree
harmonic current
generation (%)
x
operation
rate
100