摘要
本文基于结构动力学中的时滞利用技术对电力系统次同步振荡抑制展开研究。首先建立了含静止同步串联补偿器(SSSC)装置的电力系统模型,考虑SSSC注入电压与线路电流的正交特性,选取m、δ_(sc)为控制量,避免控制效果受U_(dc)波动影响。基于线性最优控制理论进行控制设计,通过时域仿真验证其能有效抑制系统振荡。广域背景下,SSSC装置利用远方机组信号作为状态信号进行实时反馈控制时,信号传输时滞不可忽略。基于时滞利用技术,建立单时滞电力系统模型,利用特征根聚类法(CTCR)分析时滞系统的稳定裕度。研究中发现,根据时滞系统稳定裕度计算结果,在控制律中引入适当的时滞量可以增强控制器性能及系统稳定性,通过时域仿真验证了正确性。
Based on the time-delay utilization technology in structural dynamics,this dissertation studies the Subsynchronous Oscillation of the power system.Try to establish a power system model with Static Synchronous Series Compensator(SSSC) device,consider the orthogonal characteristics of injection voltage of SSSC and line current,established a controllable voltage function about m,U dc ,choose m and δ dc as control variables to avoid the control effect being affected by the U dc fluctuation.Design thecontrol law based on Linear Optimal Control Theory,and verified by time domain simulation that it can effectively suppress the system oscillation.When the SSSC device uses the remote unit signal as the status signal for real-time feedback control,the time delayof signal transmission can′t be ignored.Considering the time delay of signal transmission,a single-delay power system model is established and the stability margin of the time-delay system is analyzed using the cluster treatment of characteristic roots(CTCR).It is found in the research that according to the stability margin calculation results of the time-delay system,the introduction of appropriate time delay in the control law can enhance the performance of the controller and the stability of the system,and the correctness is verified by time-domain simulation.
作者
李啸骢
蒲亭洁
张焕博
LI Xiao-cong;PU Ting-jie;ZHANG Huan-bo(Guangxi Key Laboratory of Power System Optimization and Energy Technology,Guangxi University,Nanning 530004,China;College of Electrical Engineering,Guangxi University,Nanning 530004,China)
出处
《电气开关》
2019年第2期12-20,共9页
Electric Switchgear
基金
国家自然科学基金项目(51267001)
广西自然科学基金资助项目(2014GXNSFAA118338)
广西科学研究与技术开发计划项目(14122006-29)
南宁市科学研究与技术开发计划项目(20165186)
关键词
静止同步串联补偿器
次同步振荡
特征根聚类法
时滞利用技术
static synchronous series compensator
subsynchronous oscillation
cluster treatment of characteristic roots
time-delay utilization technology
