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Improvement of unified power quality conditioner performance with enhanced resonant control strategy

机译：通过增强的谐振控制策略改善统一电能质量调节器的性能

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摘要

This study proposes an enhanced resonant control strategy for the unified power quality conditioner (UPQC) to simultaneously tackle voltage sags, unbalance and distortions on the supply side as well as current harmonics on the load side. The proposed control strategy is developed in both the series and shunt active power filters (APFs) of the UPQC. In the series APF, a proportional–resonant controller and a resonant controller are employed to mitigate voltage sags, unbalance and distortions, whereas a proportional–integral (PI) controller and three vector PI controllers are used in the shunt APF to compensate harmonic currents. The performance of the proposed UPQC control scheme is significantly improved compared with the conventional control strategy owing to the superiority of the resonant controllers. In addition, voltage sag/harmonic and current harmonic detectors are not required in the proposed control scheme, which helps to simplify the control strategy and to improve the control accuracy. The proposed control strategy is theoretically analysed and its feasibility is validated through experiments.
机译：这项研究为统一电能质量调节器（UPQC）提出了一种增强的谐振控制策略，以同时解决电源侧的电压突降，不平衡和失真以及负载侧的电流谐波。 UPQC的串联和并联有源功率滤波器（APF）中都开发了建议的控制策略。在串联APF中，采用比例谐振控制器和谐振控制器来减轻电压骤降，不平衡和失真，而并联APF中使用比例积分（PI）控制器和三个矢量PI控制器来补偿谐波电流。与传统的控制策略相比，由于谐振控制器的优越性，提出的UPQC控制方案的性能得到了显着改善。另外，在所提出的控制方案中不需要电压骤降/谐波和电流谐波检测器，这有助于简化控制策略并提高控制精度。从理论上分析了提出的控制策略，并通过实验验证了其可行性。

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