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184                                 Hybrid-Renewable Energy Systems in Microgrids























         Figure 9.21  Generator speed response.
























         Figure 9.22  Turbine speed response.

         2.5  Transient stability analysis
         This section presents the transient stability study on the system with respect to differ-
         ent system parameters with SDBR and without considering SDBR. A 250 ms three
         phase symmetrical fault is applied at one line of the double circuit transmission line
         close to the generator. The fault occurs at 25.3 s and it is cleared at 25.55 s.

         2.5.1  Effect of transmission line reactance
         Figs. 9.23–9.26 show the transient responses of the system with and without consider-
         ing SDBR for different values of the transmission line reactance. In the simulation,
         two values of transmission line reactance is considered (X  = 0.1 pu and X  = 0.4 pu).
                                                                    t
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