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<p>In order to solve the problems of load voltage imbalance and current imbalance at the grid side caused by unbalanced load in distribution network, an external energy-taking hybrid power transformer topology is proposed in this paper, which has the functions of load voltage control and current control at the grid side. By establishing the simplified equivalent circuit of the proposed topology, the principles of load voltage unbalance control and current unbalance control at the grid side are studied. Then, the mathematical models of two kinds of converters and whole transformer in topology are constructed. Considering the demands of load voltage control and current control at the distribution network side, a novel method of detecting unbalance voltage and current is studied. Based on the extraction of the features of models, a three-phase unbalance control strategy of hybrid power transformer based on IDSOGI and Kalman filter is proposed to achieve the objectives of load voltage unbalance control and current unbalance control at the grid side. Finally, the PSCAD/EMTDC software is applied to construct a system simulation model of hybrid power transformer, and the effectiveness and response performance of the strategy are analyzed.</p>

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Three-phase unbalance control strategy of hybrid power transformer based on IDSOGI and Kalman filter

  • 期刊论文

  • 发表日期：

    2025年8月5日

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  • Zejun Tong,
  • Aihong Tang,
  • Yufei Shang,
  • Lulu Ma,
  • Qian Wang,
  • Qingming Wang,
  • Chao Ding,
  • Yi Lu,
  • Peng Qiu

摘要

In order to solve the problems of load voltage imbalance and current imbalance at the grid side caused by unbalanced load in distribution network, an external energy-taking hybrid power transformer topology is proposed in this paper, which has the functions of load voltage control and current control at the grid side. By establishing the simplified equivalent circuit of the proposed topology, the principles of load voltage unbalance control and current unbalance control at the grid side are studied. Then, the mathematical models of two kinds of converters and whole transformer in topology are constructed. Considering the demands of load voltage control and current control at the distribution network side, a novel method of detecting unbalance voltage and current is studied. Based on the extraction of the features of models, a three-phase unbalance control strategy of hybrid power transformer based on IDSOGI and Kalman filter is proposed to achieve the objectives of load voltage unbalance control and current unbalance control at the grid side. Finally, the PSCAD/EMTDC software is applied to construct a system simulation model of hybrid power transformer, and the effectiveness and response performance of the strategy are analyzed.