特高压多端混合直流闭环实时仿真研究

特高压多端混合直流输电技术在满足更远距离、更大容量可再生能源输送方面提供了一种更灵活的输电方式。本文以送端采用常规特高压直流(ultra-high voltage direct current,UHVDC)、受端采用双阀组混合换流阀串联结构所构成的特高压混合三端直流输电系统为例,搭建了双极特高压混合三端直流输电系统的RT-LAB实时仿真模型,实现了与直流控制保护装置的闭环接入,测试结果验证了闭环实时仿真模型与控制保护策略的有效性。该平台可方便地实现特高压混合三端直流输电控制保护系统功能和动态性能的验证,为特高压多端混合直流输电系统的应用提供技术支撑。

Research on Closed Loop Real-Time Simulation of Multi-Terminal Hybrid UHVDC Transmission System

Multi-terminal hybrid ultra-high voltage direct current(UHVDC)transmission system provides a more flexible mode to meet the needs of longer distance and larger capacity renewable energy.In this paper,the hybrid system composed of the conventional UHVDC at the sending and the valve group series structure at the receiving is used.The RT-LAB real-time simulation model of bipolar hybrid system is built,the closed-loop connection with control and protection system is realized.The results verify the effectiveness of the closed-loop simulation model and the control and protection strategy.It can realize the verification of control and protection system function and dynamic performance of the hybrid system,and provide technical support for the application of multi-terminal hybrid UHVDC project.