Unified Smith predictor-based loop-shaping H ∞ damping controller for mitigating inter-area oscillations in power system

IF 1.7 Q3 COMPUTER SCIENCE, INFORMATION SYSTEMS
Mithu Sarkar, Bidyadhar Subudhi
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引用次数: 1

Abstract

Low-frequency inter-area oscillation is one of the major problems to transfer the bulk power from one area to another area in an interconnected large power system. A wide-area signal-based controller is more effective to improve the damping of the inter-area oscillation than a local area signal-based controller. A wide-area measurement system makes it easier to transmit the wide-area signal through the communication system from the remote location to the controller site. However, the involvement of the unavoidable time delay in the wide-area signal transmission from a remote area to a controller site is to possess a great deal of challenge to design a damping controller. In this study, a unified Smith predictor (USP)-based loop shaping controller is designed to handle the negative effect of the delay using the wide-area signal. The robust stabilization normalised co-prime factor problem is converted into a generalised H optimisation problem for additional pole placement constraints. The performances of the USP-based loop-shaping H controller are compared with the USP-based H controller. From the obtained results, it is verified that the proposed controller gives an excellent damping performance and handles the effect of time delay.

Abstract Image

基于统一Smith预测器的环整形H∞阻尼控制器缓解电力系统区域间振荡
在大型互联电力系统中,低频区域间振荡是大容量电力从一个区域传输到另一个区域的主要问题之一。基于广域信号的控制器比基于局部信号的控制器更有效地改善了区域间振荡的阻尼。广域测量系统使广域信号通过通信系统从远程位置传输到控制器站点变得更加容易。然而,广域信号从遥远的区域传输到控制器站点时,不可避免的时间延迟给阻尼控制器的设计带来了很大的挑战。在本研究中,设计了一个统一的基于Smith预测器(USP)的环路整形控制器来处理使用广域信号的延迟的负面影响。将鲁棒镇定归一化协素因子问题转化为具有附加极点布置约束的广义H∞优化问题。比较了基于usp的环整形H∞控制器与基于usp的H∞控制器的性能。仿真结果表明,所设计的控制器具有良好的阻尼性能,并能有效地处理时延的影响。
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来源期刊
IET Cyber-Physical Systems: Theory and Applications
IET Cyber-Physical Systems: Theory and Applications Computer Science-Computer Networks and Communications
CiteScore
5.40
自引率
6.70%
发文量
17
审稿时长
19 weeks
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