期刊名称：International Journal on Electrical Engineering and Informatics
印刷版ISSN：2085-6830
出版年度：2014
卷号：6
期号：4
DOI：10.15676/ijeei.2014.6.4.10
出版社：School of Electrical Engineering and Informatics
摘要：The article focuses on the issues of Load Frequency Control (LFC) undernon-linear strategies in multi source multi area hydro thermal system. On practicalperspective dead band, boiler dynamics, reheat steam turbine along with hydro turbineoperating under two different area capacities are considered in the system. Whensubjected to random load variations in both the areas, the system exhibits higheroscillations. The speed governor matches the generation with the demand. The offset inthe area frequencies and tie-line power is removed by using secondary ProportionalIntegral (PI) controller. The PI controller is tuned using Ziegler Nichols’ (ZN) andFuzzy Gain Scheduling (FGS) method. The influence of high Proportional (P) controllergain during steady state and high Integral (I) controller gain during transient affects thesystem performance. Variable Structure System (VSS) helps to switch from P to PIcontroller during transient to steady state based on control error. The concept of VSS isapplied to Fuzzy Gain Scheduling (FGS) PI controller. The performance of the optimalVariable Structure Fuzzy Gain Scheduled (VSFGS) controller under non-linearenvironment is judged and validated using performance indices.
关键词：Load Frequency Control; Multi Source Multi Area System; Hydro Thermal;System; Proportional Integral Controller; Fuzzy Gain Scheduling; Variable Structure;System Controller
