引用本文:姜惠兰,李政,肖瑞,李希钰.提高暂态稳定性的VSC-HVDC功率附加滑模控制方法[J].电力自动化设备,2022,42(2):
JIANG Huilan,LI Zheng,XIAO Rui,LI Xiyu.Sliding mode control method of VSC-HVDC additional power for improving transient stability[J].Electric Power Automation Equipment,2022,42(2):
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提高暂态稳定性的VSC-HVDC功率附加滑模控制方法
姜惠兰, 李政, 肖瑞, 李希钰
天津大学 智能电网教育部重点实验室,天津 300072
摘要:
利用直流功率快速可控的特点提高交流系统的暂态稳定性已成为交直流系统的重要研究方向。以多机交直流系统为研究对象,提出了一种提高暂态稳定性的柔性直流输电(VSC-HVDC)有功控制方法。借助VSC-HVDC接地导纳模型和对节点导纳矩阵的收缩,推导包含其整流站功率特性和拓扑信息的系统等值机械功率变化量的表达式,建立了分析整流站有功附加量与反映系统暂态稳定性的等值功角的数学模型。针对二者之间的非线性关系,采用非奇异Terminal滑模控制,以等值功角变化速度及加速度建立切换面,并依据建立的数学模型,确定出可以加快系统趋近于稳定的整流站有功附加量的控制策略。对所提控制方法的有效性进行仿真分析,结果表明,所提方法可以改善系统等值功角的变化,加快系统恢复稳定的速度。
关键词:  柔性直流输电  多机交直流系统  暂态稳定性  节点导纳矩阵  滑模控制
DOI:10.16081/j.epae.202111003
分类号:TM721.1
基金项目:国家自然科学基金资助项目(51477115)
Sliding mode control method of VSC-HVDC additional power for improving transient stability
JIANG Huilan, LI Zheng, XIAO Rui, LI Xiyu
Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Abstract:
Improving the transient stability of AC systems by using the features of fast and controllable DC power has become an important research direction for AC/DC systems. Taking the multi-machine AC/DC system as the research object, a VSC-HVDC(Voltage Source Converter based High Voltage Direct Current) active power control method to improve transient stability is proposed. With the help of VSC-HVDC ground admittance model and contraction of node admittance matrix, the expression of the system equivalent mechanical power variation including power characteristics of the rectifier station and topology information is derived, a mathematical model is established for the analysis of additional active power of rectifier station and equivalent power angle of system transient stability. For the nonlinear relationship between the rectifier station and the system, non-singular terminal sliding mode control is adopted. By establishing a switching surface with equivalent power angle changing speed and acceleration, and based on the established mathematical model, the control strategy for additional active power of rectifier station that can speed up system’s approach to stability is determined. The effectiveness of the proposed control method is simulated and analyzed, the results show that using the proposed method can improve the change of equivalent power angle and accelerate the stability recovery speed of the system.
Key words:  VSC-HVDC  multi-machine AC/DC system  transient stability  node admittance matrix  sliding mode control

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