一种串联侧三相解耦型统一电能质量控制器  

A Unified Power Quality Conditioner with Three-Phase Decoupling in Series Section

作　　者：王浩[1,2] 刘进军[2] 梅桂华[1] 

机构地区：[1]广东电网公司电力科学研究院,广州510080 [2]西安交通大学电气工程学院,西安710049

出　　处：《电工技术学报》2016年第2期215-220,共6页Transactions of China Electrotechnical Society

基　　金：国家重点基础研究发展计划(973计划)(2009CB219705)项目资助

摘　　要：传统模块化多电平变换器统一电能质量控制器(MMC-UPQC)的串联部分采用单变换器和三个单相耦合变压器,三个单相耦合变压器在变换器侧成星形联结。该结构使UPQC装置的无法补偿包含有零序分量的电压暂升/暂降。为此提出了拓扑结构改良的MMC-UPQC以改善UPQC的电压暂升/暂降能力。新拓扑MMC-UPQC串联部分采用等效串联的双变换器和三个单相耦合变压器,三个变压器在变换器侧无直接联结,串联部分实现了串联侧的三相解耦。文中分析了新拓扑MMC-UPQC改善电压暂升/暂降补偿能力和提高系统安全性、可靠性的原理。通过仿真研究,验证了新拓扑结构MMC-UPQC的正确性。与传统MMC-UPQC相比,新拓扑结构MMC-UPQC可补偿同时包含正序、负序和零序分量的电压暂升/暂降,并从减小串联变换器交流电流、降低公共直流侧电压和变换器级的冗余运行三方面可提高系统的安全性和可靠性。所提出的新拓扑结构MMC-UPQC适用于大功率应用场合。In traditional modular multilevel converter-unified power quality conditioner （MMC- UPQC）, series section adopts single converter and three single phase transformers. These three single phase transformers are connected in star at converter side. With this structure, UPQC fails to compensate the voltage swell/sag with zero sequence. A novel topology MMC-UPQC is proposed to improve the voltage swell/sag compensation capability. In the novel topology MMC-UPQC, series section adopts equivalent dual converters in series and three single phase transformers that have no direct connection, which can realize three-phase decoupling. In this paper, principle of the novel topology MMC-UPQC to improve the voltage swell/sag compensation capability and to increase the system safety and reliability is analyzed. The simulation results verify the effectiveness of the novel MMC-UPQC. Compared with the traditional MMC-UPQC, the novel MMC- UPQC can compensate the voltage swell/sag with positive, negative and zero sequence. The novel MMC-UPQC can increase the system safety and reliability by decreasing the current of series converter, decreasing the voltage at common dc side or adopting redundant operating mode at converter level.

关 键 词：统一电能质量控制器 电压暂降 串联侧 模块化多电平变换器 三相解耦 

分 类 号：TM71[电气工程—电力系统及自动化]