RT21 | [Chinese] R&D and Engineering applications of high-voltage high capacity flexible DC real-time simulation

Flexible DC transmission based on MMC is the latest generation of HVDC transmission technology with many excellent characteristics and broad application prospects. Compared with the traditional dynamic model test, the power system control protection test based on digital real-time simulation technology is better controllable, non-destructive and more cost-effective. However, as MMC contains thousands of power modules and power switching devices, there might be a series of technical challenges, such as accuracy of real-time simulation modeling, multi-time scale electromechanical-electromagnetic transient joint simulation, high bandwidth measurement and control interface technology, etc. After comprehensive analysis of the development trend of related technologies at home and abroad, our team put forward and realized a set of flexible DC test methods and platforms based on digital real-time simulation technology, completed the optimization design and verification of flexible DC control protection strategy. This presentation will introduce some achievements made by our team in flexible DC real-time simulation modeling, engineering testing, valve control technology based on RT-LAB's open simulation platform.