Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2025 , Vol. 59 >Issue 2: 252 - 265

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2023.281

New Type Power System and the Integrated Energy

Comprehensive Power Quality Management for Transformerless Unified Power Quality Conditioner Under Multiple Operating Conditions

  • FU Zhe ,
  • ZHANG Qi ,
  • LIU Yang ,
  • WAN Bohao ,
  • WANG Ting ,
  • SUN Yanfei
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  • 1. State Grid Beijing Urban District Power Supply Company, Beijing 100034, China
    2. State Grid Beijing Fengtai Power Supply Company, Beijing 100073, China

Received date: 2023-06-29

  Revised date: 2023-09-11

  Accepted date: 2023-09-14

  Online published: 2023-09-27

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Abstract

To address the power quality problems caused by power electronic loads, a two-leg topology-based transformerless unified power quality conditioner (TLTT-UPQC) is proposed, which can overcome the volume, weight, and magnetic saturation of power frequency transformer in the existing UPQCs, and can improve the power quality of the distribution network in a lightweight and highly flexible form to meet the high-quality electricity demand of loads. First, the working principle of TLTT-UPQC is analyzed from the perspective of circuit topology. Then, combined with theoretical analysis, the operating mechanisms of various power quality management functions are studied in scenarios such as grid voltage drop, rise and distortion, as well as resistor-inductance and nonlinear loads, based on which, the system control strategy is designed. Finally, a MATLAB-based simulation model is developed to verify the multifunctional operation performances of the TLTT-UPQC through simulation results.

Key words： power quality; transformerless unified power quality conditioner (UPQC); two-leg converter; power flow; multiple operating conditions

Cite this article

FU Zhe , ZHANG Qi , LIU Yang , WAN Bohao , WANG Ting , SUN Yanfei . Comprehensive Power Quality Management for Transformerless Unified Power Quality Conditioner Under Multiple Operating Conditions[J]. Journal of Shanghai Jiaotong University, 2025 , 59(2) : 252 -265 . DOI: 10.16183/j.cnki.jsjtu.2023.281

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