Preprint Article Version 1 This version is not peer-reviewed

A Three-phase to Seven-phase Energy Transformation under Unbalanced Supply Voltage

Version 1 : Received: 21 June 2018 / Approved: 25 June 2018 / Online: 25 June 2018 (16:57:17 CEST)

How to cite: Tabrez, M.; Kumar Sadhu, P.; Iqbal, A.; Ilahi Baksh, F. A Three-phase to Seven-phase Energy Transformation under Unbalanced Supply Voltage. Preprints 2018, 2018060401 (doi: 10.20944/preprints201806.0401.v1). Tabrez, M.; Kumar Sadhu, P.; Iqbal, A.; Ilahi Baksh, F. A Three-phase to Seven-phase Energy Transformation under Unbalanced Supply Voltage. Preprints 2018, 2018060401 (doi: 10.20944/preprints201806.0401.v1).

Abstract

In the recent past, multiphase power generation, power transmission, and electrical drive system are the main focus of research due to their several advantages over three phase. Multiphase drives have better performance over three-phase drives. A multiphase transformer is required at the input of a fixed frequency multiphase drive, rectifier circuit for HVDC applications and multiphase generation and transmission systems. This paper investigates a static three to seven phase conversion technique and presents a design of transformer and control strategy to analyze the effect of unbalanced supply on a three phase to seven phase transformer. The transformer so designed takes three phase as input and seven phase output is obtained at the secondary terminals. The paper also discusses input-output unbalancing. A complete design, analysis, simulation of the proposed technique and experimental validation is presented in this paper. Experimental and simulation results prove that the presented design produced a seven-phase from a tree-phase ac power. Input unbalance is reflected to output but is less than the input unbalance. A seven phase output is not produced if one phase of input is open and the transformer has more than three limbs for flux to flow. A balanced seven phase output in steady state is produced even in one phase open condition for a three limb core type transformer. A new definition of sequence components of an unbalanced seven phase system is defined in this paper.

Subject Areas

Multiphase, Open-phase, Transformer, Unbalanced supply, Winding connection

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