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The LFC-EVs systems face inevitable communication time delays that affect the frequency stability. Although communication infrastructures are necessary to maintain system stability and reliability, a large amount of delay exceeding the allowable limit leads to system instability. In this study, stability delay margin values of a time-delayed LFC-EVs system are computed by a simple method finding the critical eigenvalues. By tracing eigenvalue loci of a transformation matrix, the method easily determines critical eigenvalues on the imaginary axis and obtains stability regions in time delay space. Stability delay margins depicted as a stability region in the delay space are determined for various system parameters and verified by time-domain simulations. Results indicate that more accurate stability delay margins are obtained as compared to ones using Lyapunov\u2013Krasovskii Functionals with different linear matrix inequalities.<\/jats:p>","DOI":"10.1177\/01423312221122487","type":"journal-article","created":{"date-parts":[[2022,9,28]],"date-time":"2022-09-28T07:48:11Z","timestamp":1664351291000},"page":"874-885","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":3,"title":["Stability delay margin computation of multi-area load frequency control system with electric vehicle using critical eigenvalue tracing method"],"prefix":"10.1177","volume":"45","author":[{"given":"\u00d6mer","family":"Aydin","sequence":"first","affiliation":[{"name":"Department of Electrical and Electronics Engineering, Gazi University, 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