04190nas|a2200385 i 4500 20260818133954.0 070200s1999 th uu m rtt 00| a1eng d .b11777370 AIT Thesis no.ET-99-8 Khin Sandar Win A hybrid approach to transient stability analysis Bangkok : Asian Institute of Technology, 1999 126 leaves Thesis ; no. ET-99-8 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 1999 Transient stability is the ability of a power system to maintain synchronism when subjected to large and severe disturbance. An efficient algorithm is essential to assess the transient stability in the modern power system. Several algorithms are developed for the analysis of Transient Stability. A hybrid method developed by Y Zhang et.al [ZWRP 97} assess the transient stability quite effectively since it couples both the time domain program and the direct method. The strength of this method is namely: the modeling of each machine and analysis of detail dynamic behavior during disturbance of Time Domain Simulation and calculation of stability limit and margin of the whole system for any condition using direct method. This thesis presents an algorithm based on the hybrid (time domain- direct method) for assessing the transient stability analysis combining the Time Domain as well as the direct method. First, the system stability is checked based on the Time Domain Simulation Algorithm. This algorithm uses the loadflow output obtained from the software package developed by D. Thukaram, IISc Bangalore, India as the input data along with machine details and system parameters and generates the reduced Y-bus for all conditions viz. Prefault, During and Post fault conditions. Further swing equation is solved for each machine using the Predictor Corrector method as a part of time domain analysis. The result obtained from time Domain Simulation Algorithm is compared with the developed algorithm by D. Thukaram, !!Sc Bangalore, and India. This thesis also presents an algorithm from the Time Domain Simulation to assess the transient stability of multimachine system via a Single Machine Infinite Bus system. Here the stability margin and stability limit for SMIB is computed by the equal area criterion. The stable margin is computed if the system is stable. Else, the unstable margin is found out for the specified clearing time. Further, the clearing time is modified and the system stability is checked again based on time domain simulation. This is done iteratively modifying the clearing time till the system become stable. The stability limit (Critical Clearing Time) is calculated by using the pair of relevant unstable as well as stable margin to interpolate the stability level corresponding to zero stable margin. This gives the complete assessment of the system during any disturbance. The algorithm is tested on two sample systems as well as on one practical system. Transients (Electricity) Dhadbanjan, Thukaram, Chairperson Surapong Chiraratananon, Examination Committee Yu, Cun Yi, Examination Committee Asian Development Bank, Scholarship donor Asian Institute of Technology. Thesis ; no. ET-99-8 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B12031 .b11777370 mnait u 240421 0 000207 m a u 2 mnait mnarc 14 40 Barcode : 30050120749576 CREATED : 2014-03-02 RECORD # : i12754936 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120365597 CREATED : 2016-06-15 RECORD # : i13036907 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 56680 56680 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.ET-99-8 30050120749576 2026-08-18 13:39:54 3 2026-08-18 14 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.ET-99-8 30050120365597 2026-08-18 13:39:54 2026-08-18 40