Recently, the Jibei Electric Power Research Institute successfully completed a simulation verification experiment for the upgrade of the interconnection function of adjacent submodules of the converter valves at the Zhongdu Converter Station, part of the Zhangbei Flexible DC Project, utilizing an advanced RTDS hardware-in-the-loop simulation platform. This experiment marks the first time that a simulation verification of the program logic prior to the software upgrade of the converter station has been achieved, establishing a strong technical foundation for the safe and stable operation of the converter station.In 2024, the Zhongdu Converter Station experienced multiple communication failures with the converter valves, severely affecting its normal operation. Therefore, in 2025, a comprehensive upgrade of the communication functions of the converter valve submodules is planned in conjunction with the renovation of the central control board of the converter valves. By adding a pair of redundant communication channels between adjacent submodules, the probability of black module failures and up/down communication failures occurring in the submodules will be significantly reduced. Additionally, the automatic recovery function for black module handling logic will be upgraded, significantly enhancing the flexibility of the strategies for addressing black module issues during the startup and power delivery phase of the converter station, thereby effectively improving the energy availability of the converter station.During the simulation verification process, the Electric Power Research Institute established an RTDS hardware-in-the-loop simulation model from the Zhongdu Station to the Yanqing Station, conducting comprehensive and in-depth simulation analysis on 15 types of submodule communication failures and 4 types of black module failures. Through rigorous testing and verification, not only was the accuracy of the newly added valve control logic at the Zhongdu Station successfully validated, but a potential risk of misjudgment by on-site personnel regarding the status of submodules after the valve control upgrade was also promptly identified and eliminated.The success of this simulation verification experiment marks a significant breakthrough in the field of converter station technology research by the Electric Power Research Institute. The Institute will continue to delve deeper into the simulation verification of active bypass and bypass rejection functions for submodules, and further provide technical support for the annual maintenance of the Fukang Station and the Kangbanor Station, conducting simulation verification of related software program modifications. The Electric Power Research Institute will continue to leverage new technologies and platforms to achieve comprehensive technical supervision over the modification and upgrade of control and protection software, contributing more technological strength to the safe and stable operation of the power system.（Ji Yirun, Huai Qing）
Scan to follow usWe
China Electric Power Research Institute Power Testing and Research Branch