A hybrid active power filter device consisting of an APF and an LC filter

By designing a hybrid active power filter combining APF and LC filters, the APF capacity is reduced and combined with the LC filter, solving the problems of large fundamental frequency capacity of LC filters and high cost of APF in existing technologies, and achieving economical and efficient filtering effect under high harmonic conditions.

CN224385087UActive Publication Date: 2026-06-19BEIJING FUNCTION ELECTRIC TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
BEIJING FUNCTION ELECTRIC TECH CO LTD
Filing Date
2025-07-08
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

In existing technologies, the fixed-input LC filter method for filtering out excessive harmonics generated by the load has low versatility, and the large fundamental frequency capacity leads to a large SVG capacity and high cost, as does the APF cost.

Method used

Design a hybrid active power filter device composed of an APF and an LC filter. By reducing the capacity of the APF to 1.5% of the transformer capacity and utilizing the combination of the LC filter and the APF, controllable harmonic current and reasonable fundamental frequency capacity are achieved, meeting national standards.

Benefits of technology

It achieves cost reduction while providing reasonable fundamental frequency capacity and effective harmonic filtering effect, and improves the controllability of APF, even when the harmonic capacity is 8% greater than the transformer capacity.

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Abstract

This utility model belongs to the field of hybrid active power filters composed of APF and LC filters, specifically a hybrid active power filter device composed of APF and LC filters, including: an LC filter; the LC filter includes: a first integrated circuit U A Second integrated circuit U B and the third integrated circuit U C The first integrated circuit U A Second integrated circuit U B and the third integrated circuit U C Each circuit is equipped with a capacitor C, a first reactor L1, and a second reactor L2. A harmonic current generator (APF) is connected in parallel across the two ends of L2. The fundamental frequency capacity and harmonic capacity proposed in this patent are equal, while the APF capacity is only 1.5% of the harmonic capacity. This hybrid APF provides a reasonable fundamental frequency capacity while filtering harmonics according to national standards. It is a method to reduce costs when the harmonic capacity exceeds the transformer capacity by 8% due to repeated harmonics. It also achieves the advantage of controllable harmonics by the APF. In practical applications, it can achieve excellent filtering results.
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