Harmonics can be reduced by using of line inductances (AC-chokes) or

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Presentation transcript:

Harmonics can be reduced by using of line inductances (AC-chokes) or DC-bus- inductances. Other possibilities are active filters, high-pulse inverter (12-pulse, 24-pulse) or special compensation circuits on the supply side or in the frequency inverter. If AC or DC Choke is used: Choice criteria: inverter line current, needed uk (%), needed THD, voltage fluctuations Critical points: additional voltage loss, size, weight Remember, that values (limits) for voltage and current are not equal.

in the European Norm EN61000-3-2 and 61000-3-12 The maximum harmonic levels for public power supply networks are defined in the European Norm EN61000-3-2 and 61000-3-12 Harmonic current content in % (value of the fundamental current is 100%) Total Harmonic distortion in % up to the 40th harmonic 50 250 350 550Hz ….

Harmonic current content in % (value of the fundamental current is 100%) Table of harmonics (following data from Japanese manuals) 5th 7th 11th 13th 17th 19th 23th 25th THiD without 65 41 8,5 7,7 4,3 3,1 2,6 1,8 78 with AC 38 14,5 7,4 3,4 3,2 1,9 1,7 1,3 42 with DC 30 13 8,4 5,0 4,7 3,2 3,0 2,2 35 with AC+DC 28 9,1 7,2 4,1 3,2 2,4 1,6 1,4 31 Remember that table values may differ in relation to line power source. A700 and F700 beginning from power module 01800-EC DC-Reactor is included.