Scholarlink

<p>The unified power flow controller (UPFC) is widely used to optimize the power transfer capacity and enhance the operational flexibility in distributed renewable energy-based power systems. In this paper, a series-connected two-leg transformerless UPFC (TLT-UPFC) is proposed to achieve low-cost, high-efficiency, and flexible power-flow control. The TLT-UPFC is composed of a parallel-sided voltage-source converter (PVSC) and a series-side voltage-source converter (SVSC). The SVSC controls the power flow between two power grids, and the PVSC controls the DC-link voltage. An equivalent circuit model is built to reveal its operational principles. Then, a four-vector space-vector pulse-width modulation (FV-SVPWM) scheme is employed to achieve the coupled modulation of the PVSC and SVSC. A decoupled control strategy is designed specifically for the TLT-UPFC to control the active and reactive power independently. Furthermore, theoretical analysis shows that the proposed TLT-UPFC can effectively control the power flow between two power grids with a relatively small capacity. The power loss analysis indicates that the proposed TLT-UPFC has a lower rated capacity and lower power loss than conventional UPFC schemes. Finally, experimental tests are conducted on a single-phase 30&#xa0;kW TLT-UPFC prototype, validating the effectiveness of the proposed TLT-UPFC scheme.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Series-connected transformerless two-leg unified power flow controller for distributed power grids interconnection

  • 期刊论文

  • 发表日期：

    2026年5月20日

查看全文
  • Xinda Wang,
  • Ruihuang Liu,
  • Xin Fang,
  • Xuefeng Ge,
  • Peng Jiang,
  • Li Zhang

摘要

The unified power flow controller (UPFC) is widely used to optimize the power transfer capacity and enhance the operational flexibility in distributed renewable energy-based power systems. In this paper, a series-connected two-leg transformerless UPFC (TLT-UPFC) is proposed to achieve low-cost, high-efficiency, and flexible power-flow control. The TLT-UPFC is composed of a parallel-sided voltage-source converter (PVSC) and a series-side voltage-source converter (SVSC). The SVSC controls the power flow between two power grids, and the PVSC controls the DC-link voltage. An equivalent circuit model is built to reveal its operational principles. Then, a four-vector space-vector pulse-width modulation (FV-SVPWM) scheme is employed to achieve the coupled modulation of the PVSC and SVSC. A decoupled control strategy is designed specifically for the TLT-UPFC to control the active and reactive power independently. Furthermore, theoretical analysis shows that the proposed TLT-UPFC can effectively control the power flow between two power grids with a relatively small capacity. The power loss analysis indicates that the proposed TLT-UPFC has a lower rated capacity and lower power loss than conventional UPFC schemes. Finally, experimental tests are conducted on a single-phase 30 kW TLT-UPFC prototype, validating the effectiveness of the proposed TLT-UPFC scheme.