Fuji Electric FRENIC-Ace series, User Manual

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Appendix B Japanese Guideline for Suppressing Harmonics by Customers Receiving High
Voltage or Special High Voltage (General-purpose inverter)
Appendix-12
Appendix B Japanese Guideline for Suppressing Harmonics by Customers Receiving
High Voltage or Special High Voltage (General-purpose inverter)
Agency of Natural Resource and Energy of Japan published the following two guidelines for suppressing harmonic
noise in September 30, 1994.
(1) “Guideline to reduce harmonic emissions caused by electrical and electronic equipment for household and
general use”
(2) “Guideline of harmonics reduction for consumers with high or ultra-high voltage power receiving facilities”
Assuming that electronic devices generating high harmonics will be increasing, these guidelines are to establish
regulations for preventing high frequency noise interference on devices sharing the power source. These
guidelines should be applied to all devices that are used on the commercial power lines and generate harmonic
current. This section gives a description limited to general-purpose inverters.
B.1 Application to general-purpose inverters
[ 1 ] Guideline for suppressing harmonics in home electric and general-purpose
appliances
Our three-phase, 200 V class series inverters of 3.7 kW or less (FRENIC-MEGA series) were the products of which
were restricted by the “Guideline for Suppressing Harmonics in Home Electric and General-purpose Appliances”
(established in September 1994 and revised in October 1999) issued by the Ministry of Economy, Trade and
Industry. The above restriction, however, was lifted when the Guideline was revised in January 2004. Since then,
the inverter makers have individually imposed voluntary restrictions on the harmonics of their products. We, as
before, recommend that you connect a reactor (for suppressing harmonics) to your inverter.
[ 2 ] Guideline for suppressing harmonics by customers receiving high voltage or
special high voltage
Unlike other guidelines, this guideline is not applied to the equipment itself such as a general-purpose inverter, but
is applied to each large-scale electric power consumer for total amount of harmonics. Regulation is applied to each
power consumer rather than direct regulation of harmonic current generating equipment such as the
“general-purpose inverter”. Calculation of the amount of generated harmonic current is necessary on individual
equipment.
(1) Scope of regulation
In principle, the guideline applies to the customers that meet the following two conditions:

The customer receives high voltage or special high voltage.

The “equivalent capacity” of the converter load exceeds the standard value for the receiving voltage (50 kVA at a
receiving voltage of 6.6 kV).
“B.2 [ 1 ] Calculation of equivalent capacity (Pi)” gives you some supplemental information with regard to
estimation for the equivalent capacity of an inverter according to the guideline.
(2) Regulation
The level (calculated value) of the harmonic current that flows from the customer’s receiving point out to the
system is subjected to the regulation. The regulation value is proportional to the contract demand. The regulation
values specified in the guideline are shown in Table B-1.
“B.2 Compliance to the harmonic suppression for customers receiving high voltage or special high voltage” gives
you some supplemental information with regard to estimation for the equivalent capacity of the inverter for
compliance to “Japanese guideline for suppressing harmonics by customers receiving high voltage or special high
voltage.”
Table B-1 Upper Limits of Harmonic Outflow Current per kW of Contract Demand (mA/kW)
Receiving voltage 5th 7th 11th 13th 17th 19th 23rd Over 25th
6.6kV 3.5 2.5 1.6 1.3 1.0 0.90 0.76 0.70
22kV 1.8 1.3 0.82 0.69 0.53 0.47 0.39 0.36