级联型电力电子变压器三相电压暂降隔离能力分析  

Analysis on Three-phase Voltage Sag Isolation Capability of Cascaded Power Electronic Transformer

作　　者：徐少博 陈嘉敏 徐永海 张雪垠 龙云波 邓占锋 XU Shaobo;CHEN Jiamin;XU Yonghai;ZHANG Xueyin;LONG Yunbo;DENG Zhanfeng(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China;State Key Laboratory of Advanced Power Transmission Technology(Global Energy Interconnection Research Institute),Beijing 102209,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市102206 [2]先进输电技术国家重点实验室(全球能源互联网研究院有限公司),北京市102209

出　　处：《电力系统自动化》2020年第4期168-177,共10页Automation of Electric Power Systems

基　　金：北京市自然科学基金资助项目（3172036）;新能源电力系统国家重点实验室（华北电力大学）自主研究课题资助项目（LAPS2019-20）~~

摘　　要：级联型电力电子变压器(PET)在中低压配电网应用前景广泛,深入研究其电压暂降隔离能力,对于其器件参数选择、储能容量配置、减少电压暂降治理装置配置等工作具有重要价值。文中通过理论推导,研究了级联型PET电压暂降隔离能力的限制因素:针对输入级,深入研究了调制比、直流链电容电压波动以及开关器件电流有效值限制对其电压暂降隔离能力的影响;针对隔离级,详细分析了移相比、开关器件电流有效值及峰值限制对其隔离直流链电压跌落能力的影响;明确了不同设计参数下输入级和隔离级电压暂降隔离能力的主要限制因素,并建立了级联型PET电压暂降有效隔离区域。最后,通过仿真验证了研究结果的正确性。Cascaded power electronic transformer(PET)has broad application prospect in medium and low voltage distribution networks.In-depth study of voltage sag isolation capability of cascaded PET is of great value for parameter selection of cascaded PET device,energy storage capacity configuration and reduction of voltage sag treatment devices.Through theoretical deduction,the limiting factors of voltage sag isolation capability of cascaded PET are studied.At the input stage,the effects of modulation ratio,voltage fluctuation of DC link capacitor and RMS limit of switching device current on its voltage sag isolation capability are deeply studied.At the isolation stage,the effects of the phase-shift ratio,RMS and peak limit of switching device on the voltage sag isolation capability of DC link are analyzed in detail.The main limiting factors of the voltage sage isolation capability at the input and isolation stages with different design parameters are clarified.And the effective isolation area of cascaded PET is established.Finally,the correctness of research results is verified by simulation.

关 键 词：电压暂降 电力电子变压器 电压暂降隔离 输入级 隔离级 

分 类 号：TM41[电气工程—电器]