奚鑫泽1,2，黄文焘3，邰能灵3

1. 云南电网有限责任公司 电力科学研究院， 昆明 650217； 2. 重庆大学 电气工程学院，重庆 400044； 3. 上海交通大学 电子信息与电气工程学院， 上海 200240

作者简介:奚鑫泽（1988-）, 男, 云南省大理市人，博士, 从事新能源并网技术、电力系统稳定分析与控制等方面的研究. E-MAIL: cs_xxz@163.com
基金资助:国家自然科学基金（51707026），国家重点研发计划（2016YFB0900200）资助项目

Modeling and Digital Simulation of DC Step-Up Collection System for Large-Scale Photovoltaic Power Plants

XI Xinze,HUANG Wentao,TAI Nengling

1. Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650217，China; 2. School of Electrical Engineering, Chongqing University, Chongqing 400044, China; 3. School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

摘要/Abstract

摘要： 以大型光伏电站为主要研究对象，针对性地研究其汇集系统.通过分析多种现有光伏电站换流器接线方式的优缺点，提出一种新型的大型光伏电站直流升压汇集系统拓扑；建立基于模块化多电平换流器(Modular Multilevel Converter，MMC)技术的高变比DC/DC换流器和DC/AC换流器拓扑，并对大型光伏直流升压汇集接入系统进行建模及数字仿真；基于系统直流侧故障的原理和模型短路故障状态，比较、分析仿真结果，总结出故障特性.研究成果可为直流升压汇集系统新型设计及基于MMC的多类型换流器控制提供参考与借鉴.
关键词: 光伏电站, 直流升压汇集, 模块化多电平换流器, 换流器拓扑, RT-LAB仿真
Abstract: This paper focuses on large-scale photovoltaic power plants and its collection system. By analyzing the advantages and disadvantages of various connection methods in photovoltaic power plants, a new DC step-up collection system topology for large-scale photovoltaic power plants is proposed. Based on modular multilevel converter (MMC), the topology and control of high-ratio DC/DC and DC/AC converters are addressed. The DC step-up collection system is modeled in RT-LAB. According to the principle of DC faults in the model, the simulation results are analyzed and the fault characteristic is concluded. This paper is useful to explore the new design of the DC step-up collection system and the control of the multiple converters based on the MMC.
Key words: photovoltaic power plant, DC step-up collection, modular multilevel converter (MMC), converter topology, RT-LAB simulation


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