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<p>Unified power quality conditioner (UPQC) is widely used in electrical distribution systems for addressing power quality problems resulting from abnormal voltage, or current conditions. The phase-locked loop (PLL) introduced in the voltage compensation module is customarily used to detect and extract the fundamental positive sequence components required by UPQC to mitigate power quality problems. This paper's innovative research focuses on the phase-locked loop (PLL) component of the UPQC voltage control module. To improve the UPQC's anti-disturbance ability and response speed under various power quality disturbances, this paper designs an improved mixed second- and third-order generalized integrator PLL (MSTOGI PLL) based on an linear active disturbance rejection controller (LADRC). The performance of each UPQC model employing the LADRC-controlled MSTOGI-PLL, proportional integral (PI)-controlled MSTOGI-PLL, and SRF-PLL was evaluated under various operating conditions to compare their effectiveness in maintaining system stability and accuracy in power quality problem mitigation. The results showed that the LADRC-controlled MSTOGI-PLL device outperformed the other two models in terms of fastest response time, the least amount of overshoot, and the lowest values of THD for voltage and current during the power quality mitigation.</p>

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Analytical Design and Performance of MSTOGI-PLL in Unified Power Quality Conditioner (UPQC) for Anti-Disturbance Enhancement in Power Quality Mitigation

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Yuting Yu,
  • Muhammad Murtadha Othman,
  • Yanting Chu

摘要

Unified power quality conditioner (UPQC) is widely used in electrical distribution systems for addressing power quality problems resulting from abnormal voltage, or current conditions. The phase-locked loop (PLL) introduced in the voltage compensation module is customarily used to detect and extract the fundamental positive sequence components required by UPQC to mitigate power quality problems. This paper's innovative research focuses on the phase-locked loop (PLL) component of the UPQC voltage control module. To improve the UPQC's anti-disturbance ability and response speed under various power quality disturbances, this paper designs an improved mixed second- and third-order generalized integrator PLL (MSTOGI PLL) based on an linear active disturbance rejection controller (LADRC). The performance of each UPQC model employing the LADRC-controlled MSTOGI-PLL, proportional integral (PI)-controlled MSTOGI-PLL, and SRF-PLL was evaluated under various operating conditions to compare their effectiveness in maintaining system stability and accuracy in power quality problem mitigation. The results showed that the LADRC-controlled MSTOGI-PLL device outperformed the other two models in terms of fastest response time, the least amount of overshoot, and the lowest values of THD for voltage and current during the power quality mitigation.