Harmonic filter equipment

The harmonic filter system addresses the lack of active harmonic suppression in conventional equipment by using an LC series resonant circuit with a coil and resistor, and a fundamental wave resonant circuit, effectively managing harmonic components and reducing losses while ensuring continuous power transmission.

JP7883131B2Active Publication Date: 2026-07-01NISSIN ELECTRIC CO LTD
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Patent Information

Application Number
JP2022185603
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-11-21
Publication Date
2026-07-01
Estimated Expiration
2042-11-21

AI Technical Summary

Technical Problem

Conventional harmonic filtering equipment is designed to avoid resonance with harmonic components but does not actively suppress them, and there is a need to effectively manage harmonic components flowing in from power supply systems.

Method used

A harmonic filter system comprising an LC series resonant circuit with a coil element and a power cable connected in series, a resistor element in series with the coil and power cable, and a fundamental wave resonant circuit in parallel, which actively suppresses harmonic components using a reactor and capacitor elements, and includes a bypass circuit for abnormal conditions.

Benefits of technology

The system effectively suppresses harmonic components, reduces fundamental wave loss, and ensures continuous power transmission by actively drawing harmonics into the LC series resonant circuit, minimizing the need for additional capacitors and allowing for device miniaturization and cost reduction.

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Patent Text Reader

Abstract

To absorb a desired harmonic component in harmonic filter equipment using a power cable.SOLUTION: There is provided harmonic filter equipment 100 suppressing a harmonic component and the expansion thereof, the harmonic component being included in AC voltage of an interconnection point bus 71 connected to an AC power supply 81. The harmonic filter equipment includes: an LC series resonance circuit 10 comprising a coil element 11 connected to the interconnection point bus 71 and a power cable 12 connected to a low voltage side of the coil element 11; a resistance element 13 connected in series between the coil element 11 and the power cable 12; and a fundamental wave resonance circuit 20 which is connected in parallel to the resistance element 10, and in which a reactor element 21 and a capacitor element 22 are connected in series to resonate at a fundamental wave frequency.SELECTED DRAWING: Figure 1
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Citation Information

Patent Citations

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    JP1996331761A

  • Harmonic current suppression device

    JP2000092708A

  • High-pass filter

    JP2002118963A