|Paper title: GAIN-PHASE MARGINS BASED STABILITY ANALYSIS OF TIME DELAYED HYBRID LOAD FREQUENCY CONTROL SYSTEM
Author(s): HALIL EROL, SAFFET AYASUN,
The stability analysis of a hybrid load frequency control (LFC) system with communication delays is presented comprehensively
in this paper. Stability analysis, which contains delays, is done by using an exact and a direct analytical method. In the
computation of delay margins gain and phase margins are also taken into account. Hybrid LFC schemes installed with
proportional-integral (PI) controllers is carried out in case studies. In this method stability and relative stability regions are
obtained. Also, the stability boundary curves are obtained as a function of the PI controller parameters. Gain and phase margins
can be selected by considering time delay margin suitable with the controller gains for robustness purposes.
The main purpose of this paper is to provide information for time delay of hybrid LFC system and determine the boundaries of
constant phase margin and gain margin in a parameter space or a parameter plane. Then, the effects of adjustable parameters
can be clearly defined. The time-domain simulation studies are carried out which indicate that results are convenient.
Keywords: Hybrid power systems, Microgrids, Power system stability, Renewable energy sources, Smart gridsYear: 2021 | Tome: 66 | Issue: 2 | Pp.: 119-124
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