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3种混合直流输电系统的交流故障特性对比
李晓栋1, 徐政1, 胡四全2, 张哲任1, 韩坤2, 王帅卿2
1.浙江大学 电气工程学院,浙江 杭州 310027;2.许继集团有限公司,河南 许昌 461000
摘要:
综合电网换相换流器(LCC)和模块化多电平换流器(MMC)的优点,并针对我国西电东送的实际场景,对如下3种目前比较有应用价值的混合直流输电系统方案进行研究:方案1的送端采用LCC,受端采用半桥子模块型MMC串联二极管阀;方案2的送端采用LCC,受端采用全桥子模块与半桥子模块构成的子模块混合型MMC;方案3的送端采用LCC,受端采用LCC和半桥子模块型MMC构成的串联混合型换流器。首先,分别介绍了3种混合直流输电系统的拓扑结构、数学模型及控制方式;然后,在PSCAD/EMTDC中搭建了3种混合直流输电系统,对3种混合直流系统在送端交流系统故障和受端交流系统故障情景下的响应特性进行对比分析;最后,基于仿真结果总结了每种拓扑结构的优劣势。仿真结果表明,在送端交流系统故障的情景下,方案1可能会出现功率中断;在受端交流系统故障的情景下,方案1的故障响应特性要优于其他2种方案。
关键词:  混合直流输电系统  电网换相换流器  模块化多电平换流器  交流故障  故障特性
DOI:10.16081/j.epae.201909051
分类号:TM721.3
基金项目:国家电网有限公司总部科技项目(特高压混合级联多端直流换流阀关键技术研究)
Comparison of AC fault characteristics among three types of hybrid HVDC system
LI Xiaodong1, XU Zheng1, HU Siquan2, ZHANG Zheren1, HAN Kun2, WANG Shuaiqing2
1.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;2.XJ Group Corporation, Xuchang 461000, China
Abstract:
Considering the advantages of LCC(Line Commutated Converter) and MMC(Modular Multilevel Converter),and aiming at the actual scenario of China’s West-East Power Transmission Project, the follo-wing three types of hybrid HVDC(High Voltage Direct Current) system scheme are studied, which are currently of great application value. In Scheme 1, the sending end adopts LCC and the receiving end adopts half-bridge sub-module MMC with series diode valve; in Scheme 2, the sending end adopts LCC and the receiving end adopts the hybrid MMC composed of full-bridge sub-modules and half-bridge sub-modules; in Scheme 3, the sending end adopts LCC and the receiving end adopts the hybrid converter composed of LCC and half-bridge sub-module MMC in series. Firstly, the topological structure, mathematical model and control mode of three types of hybrid HVDC system are introduced respectively. Then, three types of hybrid HVDC system are built in PSCAD/EMTDC, and their response characteristics under fault scenarios of AC system at sending and receiving ends are compared and analyzed. Finally, the advantages and disadvantages of each topological structure are summarized based on the simulative results. Simulative results show that the power interruption may occur in Scheme 1 when fault occurs in the AC system at sending end, and the fault response characteristics of Scheme 1 are better than those of the other two schemes when fault occurs in the AC system at the receiving end.
Key words:  hybrid HVDC system  LCC  MMC  AC fault  fault characteristic

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