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Open AccessArticle

A Four-Winding Inductive Filtering Transformer to Enhance Power Quality in a High-Voltage Distribution Network Supplying Nonlinear Loads

1
State Grid Hunan Electric Power Company, Changsha 410012, China
2
The College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(10), 2021; https://doi.org/10.3390/en12102021
Received: 26 April 2019 / Revised: 22 May 2019 / Accepted: 24 May 2019 / Published: 27 May 2019
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Abstract

This paper solves the problem of reactive power and harmonics compensation in a high-voltage (HV) distribution network supplying nonlinear loads. An inductive filtering (IF) approach where passive filters connect to the filtering winding of a four-winding inductive filtering transformer (FW-IFT) is presented to enhance the power quality of the public grid. This method can not only greatly suppress harmonic currents of the medium and/or low-voltage (LV) side, but also prevent them from flowing into the public grid. The new main circuit topology, where the FW-IFT has specific filtering winding by adopting the ampere-turn balance of the transformer, is presented. On the basis of the structure of the FW-IFT, the magnetic potential balanced equation and inductive filtering technology, its equivalent circuit and mathematical model are established, and the filtering performances are analyzed in detail. Simulation and experimental results rated at SN-10/0.38 of the FW-IFT are presented to prove the efficacy of the comprehensive enhancement of power quality on the grid side. View Full-Text
Keywords: Four-winding inductive filtering transformer (FW-IFT); inductive filtering (IF); power quality; nonlinear loads; passive filter Four-winding inductive filtering transformer (FW-IFT); inductive filtering (IF); power quality; nonlinear loads; passive filter
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Chen, Y.; Huang, Z.; Duan, Z.; Fu, P.; Zhou, G.; Luo, L. A Four-Winding Inductive Filtering Transformer to Enhance Power Quality in a High-Voltage Distribution Network Supplying Nonlinear Loads. Energies 2019, 12, 2021.

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