High-modulation suppression device

The harmonic suppression device addresses AC system current distortion by generating compensation currents using feed-forward and feedback control, reducing resonant circuit resonance and minimizing system current distortion.

JP2026109400APending Publication Date: 2026-07-01CARRIER JAPAN CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
CARRIER JAPAN CORP
Filing Date
2024-12-19
Publication Date
2026-07-01

AI Technical Summary

Technical Problem

The resonant frequency of the resonant circuit formed by the system impedance and the capacitors and reactors in an AC power system with an active filter can approach the switching frequency of the power converter, causing significant distortion in the AC system current, affecting other electrical equipment.

Method used

A harmonic suppression device with a power converter and control unit that generates and supplies compensation currents to the grid line, using feed-forward and feedback control to manage harmonic components and avoid resonant circuit resonance.

Benefits of technology

Reduces current distortion in the AC system, minimizing adverse effects on connected electrical equipment by preventing resonant circuit resonance.

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Abstract

To provide a harmonic suppression device that can reduce current distortion in AC systems. [Solution] The harmonic suppression device detects the harmonic components of the load current flowing through the grid line, determines a compensation current for suppression of the detected harmonic components, extracts a compensation current from the determined compensation current for a predetermined period that includes the commutation timing of the load current, and controls the power converter so that the extracted compensation current is supplied from the power converter to the grid line.
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