基于全局滑模的自适应电力系统混沌容错控制  

Chaos Fault-Tolerant Control of Adaptive Power System Based on Global Sliding Mode

作　　者：于永进 杨洋 Yu Yongjin;Yang Yang(School of Electrical Engineering and Automation Shandong University of Science and Technology ,Qingdao 266590 China;Substation Operation and Maintenance Center State Grid Yangquan Power Supply Company ,Yangquan 045000 China)

机构地区：[1]山东科技大学电气与自动化工程学院,青岛266590 [2]国家电网阳泉供电公司变电运维中心,阳泉045000

出　　处：《电工技术学报》2023年第23期6332-6344,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(61803233)。

摘　　要：当电力系统参数变动或遭受扰动后,系统极易进入局部混沌振荡状态,局部的功角振荡可能会演化为大范围的系统振荡,最终可能造成系统解列等严重后果。因此,抑制电力系统的局部混沌振荡状态具有重要意义。为抑制七阶系统的混沌状态,增强系统的抗扰能力,采用扩张观测器对系统发电机侧与负荷侧的系统项进行观测,设计了基于全局滑模的容错控制器。该文考虑了发电机侧遭受扰动与负荷侧控制器故障的情况。为减少系统在扰动下的最大偏差与稳态误差,并补偿控制器故障导致的输出幅值损失,设计了基于全局滑模的自适应容错控制器。仿真结果表明,当系统分别遭受传输故障、阶跃扰动及控制器故障时,系统在基于自适应全局滑模的容错控制器的作用下均能有效收敛至目标轨道。When the power system suffers from external disturbance or the parameters change in a certain range,the power Angle of the system may appear disordered oscillation in a certain range,that is,the system enters a chaotic state.At present,in order to suppress the chaotic state of power system,controllers using various principles have been designed,but the disturbance and controller failure are rarely considered in the design process.To solve this problem,this paper proposes an adaptive fault-tolerant control strategy based on global sliding mode,which makes the system more stable under the action of the controller.Firstly,according to the characteristics of the seven-dimensional system,the dynamic characteristics of the system under the change of key parameters P0 and Q0 are obtained by using the bifurcation diagram and phase diagram.After analysis,it can be seen that when P0 changes from small to large,the system presents a transition phenomenon from periodic to chaotic state,and when Q0 changes from small to large,the system presents a transition phenomenon from chaotic to periodic state.Through the analysis of chaotic characteristics,the chaotic state parameters of the system are obtained.Secondly,in order to solve the problem that the controller could not timely obtain the changes of system items due to the disturbance,an observer was designed to observe the operation characteristics of the synchronous generator rotor and input the observation results to the input end of the controller.This paper proposes a Fault-tolerant control(FTC)strategy based on global sliding mode extended observer.In order to further reduce the fluctuation of the system under the disturbance and consider the possible failure,the method of combining fixed gain and adaptive gain is adopted in the controller.A strategy of adaptive fault-tolerant control(AFTC)based on global sliding mode observer is proposed.The simulation results show that,under the action of FTC,the state variables of the system converge to the fixed orbit,and the output o

关 键 词：电力系统 混沌 全局滑模 自适应 扩张观测器 

分 类 号：TM712[电气工程—电力系统及自动化]