Unified Power Quality Conditioner Based on Novel Dual Closed-loop Control

XI Chao; YU Mengtian; NIE Jian; FENG Qi; ZHAO Junbo; MA Hui

doi:10.14044/j.1674-1757.pcrpc.2025.03.012

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Unified Power Quality Conditioner Based on Novel Dual Closed-loop Control

Research on System Application | 更新时间：2025-07-02

- Unified Power Quality Conditioner Based on Novel Dual Closed-loop Control
- Power Capacitor & Reactive Power Compensation Vol. 46, Issue 3, Pages: 91-98(2025)
- 作者机构：
  
  1.国网湖北省电力有限公司洪湖市供电公司，湖北　荆州　433200
  2.三峡大学电气与新能源学院，湖北　宜昌　443002
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2025.03.012
  CLC：
- Received：11 November 2024，
  
  Published：25 June 2025
- 稿件说明：
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XI Chao, YU Mengtian, NIE Jian, et al. Unified Power Quality Conditioner Based on Novel Dual Closed-loop Control[J]. Power capacitor & reactive power compensation, 2025, 46(3): 91-98.
DOI：

XI Chao, YU Mengtian, NIE Jian, et al. Unified Power Quality Conditioner Based on Novel Dual Closed-loop Control[J]. Power capacitor & reactive power compensation, 2025, 46(3): 91-98. DOI： 10.14044/j.1674-1757.pcrpc.2025.03.012.

摘要

针对统一电能质量调节器中传统PI控制器存在跟踪能力较差和控制精度较低的问题，本文提出一种并联侧有源电力滤波器（APF）为双闭环非线性复合控制方法的统一电能质量调节器（UPQC）。新型UPQC并联侧APF采用了一种新型双闭环非线性复合控制方法，电压外环利用滑模PI复合非线性控制算法，电流内环则使用重复PI非线性控制算法。通过实验装置对UPQC在静态干扰（如电网电压谐波/不平衡和负载电流谐波）及动态干扰（如电压骤降/骤升和负载变化）下的性能测试，结果表明所提UPQC能够在负载突变和参考电压跳变时提高直流侧电压的响应速度和稳态精度，验证了理论的正确性。

Abstract

Aiming at such issues as weak tracking ability and low control accuracy of traditional PI controllers in the unified power quality conditioner

a unified power quality conditioner (UPQC) with a parallel side active power filter (APF) as a double closed-loop nonlinear composite control method is proposed in this paper. A new dual-loop nonlinear composite control method of the APF at the parallel side of UPQC is adopted

a sliding mode PI composite nonlinear control algorithm is used for the voltage outer loop and a repetitive PI nonlinear control algorithm is used for the the current inner loop. Performance tests of the UPQC under static disturbances (such as grid voltage harmonics/imbalance and load current harmonics) and dynamic disturbances (such as voltage sags/surges and load variations) are performed through the experimental device. The results show that the proposed UPQC can

in case of load mutation and reference voltage jump

improve the response speed and steady-state accuracy of the DC-side voltage

thereby validating the correctness of the theory.

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