特高压直流输电系统实时闭环仿真建模

仿真研究是发展高压、超高压和特高压电网的必要手段。为深入研究特高压直流输电技术和特高压交直流混联系统的特性,基于RTDS仿真器和南瑞继保研制的±800kV直流控制保护样机搭建了云广直流输电系统"孤岛"运行方式实时闭环仿真模型。为验证所建模型的有效性和可信性,与非实时电磁暂态软件PSCAD/EMTDC对单电气元件特性、云广直流输电系统稳态潮流和暂态特征进行了仿真校核和分析。校核结果显示,2种仿真工具模拟的电气元件特性、系统稳态潮流和暂态特征基本一致,从而表明了搭建的实时闭环云广直流输电系统的可用性和可信性。由于考虑了UHVDC控制与保护设备的控制作用的实时参与,所搭建的闭环云广直流仿真系统将更能反映实际交直流系统的动态特性,更具实际工程参考价值。所述的闭环云广直流输电仿真系统已成功应用于云广特高压直流输电工程相关的多项关键科研项目,从而为云广特高压直流输电工程的建设和运行提供了有力的技术支持。

Modeling studies on real-time closed-loop simulation of UHVDC transmission system

Power system simulation studies are necessary for developing HV, EHV and UHV grids. For lucubrating the UHVDC technologies and the characteristics of UHV integrated AC/DC power grids, a real-time closed-loop simulation model of ' islanded operation' configuration of Yun-Guang UHVDC transmission system was developed based on the RTDS and the±800 kV control and protection equipment designed by NARI-relays Cooperation. For verifying the validity and creditability of the proposed model, the electrical characteristics of the single components, the system power flow and transient characteristics were compared with the simulation results of PSCAD/EMTDC. The compared results show that these characteristics are consistent in essence. Hence, the proposed real-time closed-loop simulation model is usable and creditable. The real-time effects of actual UHVDC control and protection equipment are taken into account in the proposed model, thus the closed-loop simulation results can not only reflect the characteristics of AC-DC power system more accurately, but provide valuable information to engineering applications as well. The proposed simulation model has been successfully used in some key UHVDC transmission system research projects, and contributed much in technologies to the construction and the operation of the Yun-Guang UHVDC transmission system.