基于LCC和双钳位MMC混联高压直流输电的实验  

Experiment of Hybrid High Voltage Direct Current Transmission based on LCC and Clamp Double Sub Module MMC

作　　者：李建国 刘文华[2] 王久和[1] 李慧[1] 宋强[2] Li Jianguo;Liu Wenhua;Wang Jiuhe;Li Hui;Song Qiang(School of Automation Beijing Information Science and Technology University Beijing 100192 China;State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing 100084 China)

机构地区：[1]北京信息科技大学自动化学院,北京100192 [2]电力系统及发电设备控制和仿真国家重点实验室(清华大学),北京100084

出　　处：《电工技术学报》2018年第16期3677-3685,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51777012);北京市自然科学基金(3172015)资助项目

摘　　要：基于电流型变换器(也称电网换相变换器LCC)和电压型变换器(VSC)的混联高压直流输电系统,不仅可以灵活控制有功和无功功率,也便于多端新能源电源的并网和无源负荷的供电,并统一接入电网,实现LCC和VSC高压直流输电的优势互补。在分析主电路和子模块拓扑结构、充电控制、脉冲调制和功率控制策略的基础上,对基于LCC和双钳位模块化多电平变换器(MMC)混联高压直流输电的直流短路故障穿越、单极运行和双极运行进行实验研究。实验结果表明,所采用拓扑结构可实现混联高压直流输电运行,具有直流短路故障穿越能力,可以快速清除直流短路故障电流,对瞬时性故障还可以快速恢复供电,具有很强的理论和工程应用价值。The hybrid high voltage direct current(HVDC)transmission based on line commuted converter(LCC)and voltage source converter(VSC),not only can control the active power and reactive power separately and easily,but also connect the distributed new energy power systems and passive loads to the power system grid easily.In this paper,the main circuit topology and sub module topology,charging control,pulse modulation and power control strategies were firstly analyzed.Then,regarding the hybrid HVDC transmission based on LCC and clamp double sub module modular multilevel converter(MMC),the physical prototype tests about short circuit fault ride through capability,monopolar and bipolar operation behavior were conducted.The experimental results show that the topology used can realize hybrid HVDC transmission operation,stand the direct current short circuit fault,clear the short circuit fault current quickly,and restore the system quickly when the transient fault disappears,which contributes the theoretical and practical value of hybrid HVDC transmission based on LCC and VSC.

关 键 词：电压型变换器 电流型变换器 混联高压直流输电 直流短路故障穿越 

分 类 号：TM46[电气工程—电器]