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VSC-HVDC system based on hybrid multilevel voltage sourced converters
Author(s): 
Pages: 33-38
Year: Issue:  10
Journal: Power System Protection and Control

Keyword:  VSC-HVDChybrid multilevel converters (HMC)circuit topologyvoltage-balancing schemefeed forward cross decoupling;
Abstract: 针对一种混合型多电平换流器(Hybrid Multilevel Converters, HMC)在柔性直流输电系统(VSC-HVDC)中的应用进行了研究.阐述HMC的电路拓扑和工作原理,从功率角度分析子模块电容电压均衡条件,介绍了换流器的基本控制策略,提出了一种改进控制策略和HMC子模块串的均压控制策略.提出了基于HMC的前馈交叉解耦控制策略,包括有功无功解耦控制器,以及直流侧电压控制器.利用PSCAD/EMTDC建立了基于HMC双端三相35 kV,240子模块的VSC-HVDC详细仿真模型,验证了所提出的主电路拓扑和控制策略.
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