适用于纯新能源基地送出的混合型直流输电方案  

HYBRID HVDC TRANSMISSION SCHEME OF PURE RENEWABLE ENERGY BASE

作　　者：刘文韬 张哲任[1] 徐政[1] Liu Wentao;Zhang Zheren;Xu Zheng(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《太阳能学报》2023年第12期533-543,共11页Acta Energiae Solaris Sinica

摘　　要：为实现光伏、风电等新能源远距离输送,提出一种适用于大规模新能源远距离外送的混合型直流输电系统。首先,介绍混合型直流输电系统的拓扑结构和数学模型,整流站采用半桥子模块型模块化多电平换流器(MMC)与电网换相换流器(LCC)串联,逆变站采用混合型MMC,该系统能为新能源基地提供电压支撑并且实现直流故障的自清除;然后,提出系统的稳态控制方式与交直流故障下的控制策略;最后,在PSCAD/EMTDC中对送端功率波动、送端交流故障、受端交流故障、直流线路故障等4个典型场景进行仿真分析,验证了控制策略的有效性。In order to realize the long-distance transmission of sustainable energy sources such as photovoltaic and wind power,a hybrid HVDC transmission scheme for large-scale renewable energy sources long-distance transmission is proposed.Firstly,the topology structure and mathematical model of the hybrid HVDC transmission system are introduced.The rectifier station adopts half-bridge modular multilevel converters and line commutated converter in series,and the inverter station adopts hybrid modular multilevel converters,which is capable of providing voltage support for the renewable energy bases and realize self-clearance of DC faults.Then the steady-state control method of the system and the control strategy under AC and DC faults are further proposed.Finally,based on PSCAD/EMTDC,an electromagnetic transient simulation model is built.The effectiveness of the control strategy is verified by four typical scenarios,which include power fluctuation at the sending-end,AC fault at the sending-end,AC fault at the receiving end,and DC line fault.

关 键 词：高压直流输电系统 电力系统 可再生能源 电网换相换流器 模块化多电平换流器 故障穿越 

分 类 号：TM722[电气工程—电力系统及自动化]