±800kV多端特高压直流系统的建模与模拟

Modeling and simulation of±800 kV multi terminal ultra high voltage DC system

研究目的旨在深入了解多端直流(Modified Total Direct Costs,MTDC)系统的运行情况,并开发设计可靠稳定运行的系统参数所需的专业体系。研究的对象为±800 kV、6000 MW,总输电距离为1728 km的特高压直流输电系统。研究方法为运用仿真软件建立了多端直流(Modified Total Direct Costs,MTDC)系统的详细模型,构建了完整的直流输电系统,生成图形,并分析了瞬态仿真结果。实验结果表明在故障情况下,使用断路器运行MTDC系统时,低压限流环节(Voltage Dependent Current Order Limiter,VDCOL)快速将直流电流的峰值降至最低。

The purpose of this study is to gain a deeper understanding of the operation of the MTDC system and develop a professional system required for designing reliable and stable system parameters.The research object is an ultra-high voltage direct current transmission system with±800 kV,6000 MW,and a total transmission distance of 1728 km.The research method is to use simulation software to establish MTDC system,construct a complete DC transmission system,generate graphics,and analyze transient simulation results.The experimental results show that under fault conditions,when using circuit breakers to operate the MTDC system,voltage dependent current order limiter(VDCOL)quickly reduces the peak value of DC current to the minimum.