A New Harmonic Mitigation System With Double Balanced Impedance Filtering Power Transformer for Multistage Distribution Network

In this article, a new harmonic mitigation system using double balanced impedance filtering power transformer (DBI-FPT) is proposed for improving the power quality (PQ). Designed for multistage distribution network with severe harmonic pollution, the proposed system enhances multiport filtering performance, mitigates resonance along with reduction of construction and maintenance costs compared to other alternative system. The simplified model of the proposed system is established by combining the short-circuit impedance calculation method and the characteristics of dual-balanced winding. By analyzing the influence of manufacturing errors on the dual-balanced winding in detail, the optimization method for filtering performance is given, which in turn guides the practical application of DBI-FPT effectively. After that, through comprehensively comparative analysis, the multiport harmonic mitigation characteristics, resonance avoidance, and amplification weaken mechanism of the proposed method are revealed. The experimental results validate that the proposed system is suitable for multiterminal PQ improvement and industrial application in multistage regional distribution network.

Automated summary

This article introduces a new harmonic mitigation system using double balanced impedance filtering power transformer, designed for multistage distribution network to improve power quality while reducing harmonics and costs. The system's simplified model, analysis of manufacturing errors on dual-balanced windings, and optimization method for filtering performance guide practical application effectively. Comparative analysis reveals the system's multiport harmonic mitigation characteristics, resonance avoidance, and amplification weaken mechanism.