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首页> 外文期刊>Power Electronics, IET >Application of multilevel full bridge converters in HVDC multiterminal systems
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Application of multilevel full bridge converters in HVDC multiterminal systems

机译：多电平全桥变换器在高压直流输电多端系统中的应用

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摘要

The worldwide demand for flexible transmission grids leads to an increasing interest in high voltage direct current (HVDC)-voltage source converter systems resulting to the planning of radial and interconnected HVDC multiterminal grids. Since HVDC multiterminal systems have high requirements on control and protection, modular multilevel converter with full bridge (FB) submodules can be applied, preventing the handling of high fault current amplitudes. However, the feasibility of multiterminal HVDC systems utilising FB submodules has to be evaluated against the general background of selective fault handling and velocity of the fault clearing process. These necessary investigations are presented within this contribution, carried out by use of an appropriate simulation model in PSCAD/ EMTDC. Thereby, requirements for protection concepts and protective devices for multiterminal systems can be further formulated. Three different variations of a protection concept have been investigated, which differ in the degree of communication structure between the converter stations and protective devices. These scenarios contain approaches with no communication, minimum communication and full communication.
机译：对柔性输电网的全球需求导致对高压直流（HVDC）-电压源转换器系统的兴趣日益浓厚，从而导致了径向和互连HVDC多端子电网的规划。由于HVDC多端子系统对控制和保护有很高的要求，因此可以使用带有全桥（FB）子模块的模块化多电平转换器，从而避免了对高故障电流幅度的处理。但是，必须在选择性故障处理和故障清除过程的速度的一般背景下评估利用FB子模块的多端子HVDC系统的可行性。通过使用PSCAD / EMTDC中的适当仿真模型来执行这些贡献，在此贡献中介绍了这些必要的研究。由此，可以进一步提出对多端子系统的保护概念和保护装置的要求。已经研究了保护概念的三个不同变体，它们在换流站和保护设备之间的通信结构程度不同。这些方案包含无通信，最少通信和完全通信的方法。

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