混合级联多端直流输电研究及其动模系统试验

Hybrid Cascaded Multi-terminal Direct Current Transmission Research and Its Dynamic Model Test

混合级联多端直流输电拓扑方案为整流侧采用LCC换流器,逆变侧采用高端LCC换流器串联低端多个电压源换流器(VSC),该拓扑方案可以充分发挥LCC换流器和VSC技术优势。混合级联多端作为新一代直流输电技术,仍有多个关键技术亟需突破,通过研制混合级联多端直流输电动模试验系统,对混合级联多端直流输电启动、高低阀组投退以及直流故障自清除等多个关键技术进行研究和试验验证,为混合级联多端直流输电技术工程应用提供技术支撑。

The hybrid cascaded multi-terminal direct current transmission topology scheme uses LCC converter at the sending end and high-end LCC converter at the receiving end to connect multiple voltage source converter(VSC)at the low end in series.This topology scheme can give full play to the technical advantages of LCC converter and VSC.As a new generation of direct current transmission technology,hybrid cascaded multi-terminal still has many key technologies to break through.Through the development of hybrid cascaded multi-terminal direct current transmission dynamic model test system,the start-up,shutdown,high and low valves switching-back and direct current fault self-cleaning of hybrid cascaded multi-terminal direct current transmission are studied and tested.It provides technical support for the engineering application of hybrid cascaded multi-terminal direct current transmission technology.