Work

Design of Fully Decoupled Planar Magnetic Integrated Three‐Phase Harmonic Filter for the Grid‐Connected Inverter System

Year: 2025

Type: article

Abstract: ABSTRACT The three‐phase inverter is a crucial power conversion device in renewable energy generation systems, but its output current contains numerous harmonics. These harmonics necessitate the use of harmonic filters to meet grid connection standards. Compared to L or LC filters, the LCL filter is widely used as a third‐order filter due to its higher noise attenuation rate. However, the LCL filter's multiple inductors result in a larger volume and weight, which hinders the improvement of the system's power density. Magnetic integration technology effectively reduces the filter's volume and weight, but the coupling between inductors can impact the high‐frequency noise attenuation ability. This article proposes a planar magnetic integration scheme that achieves decoupling of inverter side and grid side inductors, with a low coupling coefficient between both inverter side inductors and grid side inductors. Compared to traditional filters, the proposed magnetic integrated LCL filter is lighter and more compact, thereby enhancing system power density. The harmonic suppression effect of the designed magnetic integrated LCL filter is validated through simulations and experiments. Even under asymmetric load conditions, the proposed filter demonstrates good harmonic suppression performance.

Source: International Journal of Circuit Theory and Applications

DOI: 10.1002/cta.4565

Authors: Xudong Zhang, Yitao Liu

Institution: Shenzhen University

Language: English

Topic: Power Quality and Harmonics

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: bronze

Funders: National Natural Science Foundation of China, Natural Science Foundation of Guangdong Province