Protection and control of dc grids based on modular multilevel converters

高压直流（HVDC）线路为大容量电力的传输提供了便利。在不同类型的高压直流技术中，基于电压源变换器（VSC）的配置，特别是模块化多电平变换器（MMC）的实现，具有很高的吸引力，因为可以互连额外的终端以形成多终端高压直流系统，从而提供更好的可控性和系统可靠性。然而，这种灵活性是以在保护和控制方面的额外挑战性要求为代价的。这个为期三年半的研究项目将研究这些挑战，并为促进多终端HVDC系统的部署提供新颖的解决方案。

The transmission of bulk power has been facilitated by high-voltage direct-current (HVDC) links. Among the different types of HVDC technology, voltage source converter (VSC) based configurations, particularly modular multilevel converter (MMC) implementations, are highly attractive due to the possibility to interconnect additional terminals to form multi-terminal HVDC systems-offering a greater controllability and system reliability. However, this flexibility comes at the expense of additional challenging requirements in terms of protection and control. This 3.5 year research project will examine these challenges and will provide novel solutions towards facilitating deployment of multiterminal HVDC systems.