Abstract In this paper, a detailed mathematical analysis of the power flow through the two converters of the Unified Power Quality Conditioner (UPQC) using its dual control strategy (iUPQC) is developed. Unlike previous power flow analyses, the proposed approach considers the power processed due to load current harmonics and grid voltage related problems, such as harmonic distortion, unbalance and fundamental frequency long-duration disturbances. Such analysis considers the unified conditioner under its conventional operation and with the implementation of the power angle control (PAC), which usually provides load reactive power demand sharing between the converters. The presented power flow analysis results in a better understanding on how the PAC can be used to equalize the powers processed by each of the iUPQC converters under general abnormal conditions. Besides, it contributes to clarify how such control can be used to provide active power cancelation or loss reduction. Finally, a three-phase four-wire prototype of an iUPQC was built to experimentally validate the proposed approach.

中文翻译：

---

使用功率角控制 (PAC) 的双统一电能质量调节器 (iUPQC) 的详细潮流分析

摘要 在本文中，使用其双重控制策略 (iUPQC) 开发了通过统一电能质量调节器 (UPQC) 的两个转换器的功率流的详细数学分析。与以前的潮流分析不同，所提出的方法考虑了由于负载电流谐波和电网电压相关问题而处理的功率，例如谐波失真、不平衡和基频长期干扰。这种分析考虑了统一调节器在其常规操作和功率角控制 (PAC) 的实施下，通常在转换器之间提供负载无功功率需求共享。所呈现的潮流分析有助于更好地理解如何使用 PAC 来均衡每个 iUPQC 转换器在一般异常条件下处理的功率。此外，它有助于阐明如何使用这种控制来提供有功功率消除或损耗减少。最后，构建了 iUPQC 的三相四线原型，以通过实验验证所提出的方法。