直流输电控制与保护系统的工程镜像仿真方法

为了研究直流输电工程对电网的影响,针对直流输电控制与保护系统,提出了一种工程镜像仿真概念并研究了其实现方法。首先分析了工程镜像仿真的基本原理和关键技术。然后针对直流输电控制与保护系统典型开发平台SIMADYN D开发了工程镜像仿真工具New Link C组态软件平台,利用New LinkC完成了直流控制保护仿真程序功能模块的编制,并封装成能够被RTDS识别的直流控制保护仿真模块,与已有的RTDS系统元件仿真模块(如交流系统、换流变压器、换流阀、直流线路、滤波器等)构成RTDS闭环交直流实时仿真系统。最后以贵广Ⅱ回直流输电项目为例,对比分析了实际控制保护系统与镜像系统的暂态过程,结果表明,该镜像系统能准确反映实际控制保护Ⅱ系统的运行特性,可替代实际控制保护系统进行直流输电工程的仿真研究。

Engineering mirror simulation method of control and protection system in DC transmission

In order to study the influence of the HVDC project on the power grid, the concept of engineering image simulation is proposed for an HVDC control and protection system, and its implementation method is studied. First, the basic principle and key technology of engineering mirror simulation are analyzed, and then the engineering mirror simulation tool NewLinkC configuration software platform is developed for the typical development platform SIMADYN D of DC transmission control and protection system. The DC control protection simulation program function module is completed using NewLinkC and encapsulated into a DC control protection simulation module which can be identified by RTDS. It constitutes an RTDS closed-loop AC/DC real-time simulation system with an existing RTDS system component simulation module such as an AC system, converter transformer, converter valve, DC line, filter, etc. Finally, taking the Gui-Guang II HVDC transmission project as an example, the transient process of the actual control and protection system and the mirror system are compared and analyzed. The results show that the mirror system can accurately reflect the operational characteristics of the actual control and protection system, and can replace the actual control and protection system for the simulation research of DC transmission engineering. This work is supported by the National Natural Science Foundation of China (No. 52007143).