南京工程学院电力工程学院，南京 211167
国电南瑞科技股份有限公司，南京 211106
收稿：2025-12-01，
修回：2025-12-22，
纸质出版：2026-06-25
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针对配电台区三相四线制系统在不平衡工况下直流侧不均压的难题，本文提出一种面向配电台区治理的基于碳化硅（SiC）的多端口柔性调控装置（V-UPQC）。利用SiC的高频特性构建了共直流母线模块化拓扑架构，减小了滤波器体积并提升了功率密度。在控制策略上，对串联侧交流电压外环策略进行改进，针对三相四线制系统中的不平衡问题，提出了一种基于比例-积分-谐振（PIR）控制器的中点电位平衡策略，有效抑制了直流电压上下不均压的问题。最后，通过仿真验证了所提装置在电压动态补偿及不平衡治理方面的有效性。
To address the issue of uneven DC-side voltage in three-phase four-wire distribution systems under unbalanced conditions，this paper proposes a silicon carbide（SiC）-based multi-port flexible control device（V-UPQC）aimed at distribution network management. By leveraging the high-frequency characteristics of SiC，a modular topology with a common DC bus is constructed，reducing filter size and enhancing power density. In terms of control strategy，the outer loop strategy of the series-side AC voltage is improved，and for the unbalance problem in three-phase four-wire systems，a midpoint potential balancing strategy based on a proportional-integral-resonant（PIR）controller is proposed to effectively suppress DC voltage imbalance. Finally，simulations verify the effectiveness of the proposed device in voltage dynamic compensation and unbalance mitigation.
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