AUTHOR=Su Kangyou , Li Yan , Chen Jian , Duan Wenyong 

TITLE=Optimization and H∞ Performance Analysis for Load Frequency Control of Power Systems With Time-Varying Delays

JOURNAL=Frontiers in Energy Research

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2021.762480

DOI=10.3389/fenrg.2021.762480

ISSN=2296-598X

ABSTRACT=<p>With the development and expansion of the power grid, the load frequency control (LFC) scheme receives sensor signals and outputs control signals through an open communication network with a mass of data and extensive information exchange, which may introduce constant, and time-varying delays. This paper considers the optimization and <italic>H</italic><sub><italic>∞</italic></sub> performance problem for LFC of power systems with time-varying delays. Some improved criteria for guaranteeing the stability and <italic>H</italic><sub><italic>∞</italic></sub> performance of the closed-loop system with unknown external load disturbances via the Lyapunov stability theory application. An unique delay-dependent proportional-integral (PI) controller and an optimized PI controller are designed for a specified <italic>H</italic><sub><italic>∞</italic></sub> performance index and set, respectively. The criteria proposed in this paper are based on linear matrix inequalities (LMIs), which can be easily solved by the MATLAB LMI-Toolbox. Finally, in case studies, the effectiveness of our method is demonstrated.</p>