This paper proposes a hybrid fuzzy control strategy comprising both Takagi-Sugeno fuzzy and Mamdani fuzzy along with novel feedback integral phase-locked loop based modified synchronous reference frame for unified power quality conditioner for power quality enhancement in power distribution network. The hybrid fuzzy controller can vary the gain nonlinearly for controlling dc-bus capacitor voltage of unified power quality conditioner, which limits the dc-bus voltage deviations during the load and supply voltage turbulences. Moreover, the proposed novel feedback integral phase-locked loop system is employed to improve the grid synchronization performance of unified power quality conditioner by considering the feedback integral loop and nonlinear adaptive-filter type phase detector approach. As a consequence, the proposed feedback integral phase-locked loop system can extract the positive sequence signal perfectly during power system disturbances. Additionally, the novelty of modified synchronous reference frame control technique relies upon nonintervention with low pass filter as well as high pass filter. Hence, the proposed control technique quickly and accurately extracts the reference signal from the distorted power system. The efficacy of the proposed control technique is justified through a real-time Opal-RT Hardware underneath different states of power system and compared with both conventional modified phase locked loop system and Takagi-Sugeno fuzzy with synchronous reference frame-based control system.

中文翻译：

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基于混合模糊反馈积分锁相环的统一电能质量调节器控制策略

本文提出了一种混合模糊控制策略，包括 Takagi-Sugeno 模糊和 Mamdani 模糊以及基于新型反馈积分锁相环的改进同步参考系，用于统一电能质量调节器，用于配电网络中的电能质量增强。混合模糊控制器可以非线性地改变增益来控制统一电能质量调节器的直流母线电容器电压，从而限制了负载和电源电压波动期间直流母线电压的偏差。此外，通过考虑反馈积分环和非线性自适应滤波器型鉴相器方法，采用所提出的新型反馈积分锁相环系统来提高统一电能质量调节器的电网同步性能。作为结果，所提出的反馈积分锁相环系统可以在电力系统扰动期间完美地提取正序信号。此外，改进的同步参考系控制技术的新颖性依赖于低通滤波器和高通滤波器的无干预。因此，所提出的控制技术可以快速准确地从失真的电力系统中提取参考信号。所提出的控制技术的有效性通过电力系统不同状态下的实时 Opal-RT 硬件来证明，并与传统的改进锁相环系统和基于同步参考系的控制系统的 Takagi-Sugeno 模糊进行比较。改进的同步参考系控制技术的新颖性依赖于低通滤波器和高通滤波器的无干预。因此，所提出的控制技术可以快速准确地从失真的电力系统中提取参考信号。所提出的控制技术的有效性通过电力系统不同状态下的实时 Opal-RT 硬件来证明，并与传统的改进锁相环系统和基于同步参考系的控制系统的 Takagi-Sugeno 模糊进行比较。改进的同步参考系控制技术的新颖性依赖于低通滤波器和高通滤波器的无干预。因此，所提出的控制技术可以快速准确地从失真的电力系统中提取参考信号。所提出的控制技术的有效性通过电力系统不同状态下的实时 Opal-RT 硬件来证明，并与传统的改进锁相环系统和基于同步参考系的控制系统的 Takagi-Sugeno 模糊进行比较。