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By Padiyar, K. R.

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Is the equivalent damping coefficient J. ( P IS 2 = 2~m, is the mechanical torque of the equivalent two pole machine The above equation represents the transformation of 'P' pole machine 2 to a 2 pole machine. The mechanical torque is reduced by a factor of p. ) 2. However, since all the equations are expressed in per unit (to be introduced later) there is no loss of generality in assuming that the machine has two poles (as stated earlier). 3 Park's Transformation The combined voltage equations (for the stator and the rotor) can be expressed as 3.

0 p. u. Assume that the postfault system is identical to the pre-fault system. Additional data: H = 4 fB = 50Hz. Solution The power angle curve is shown in Fig. 19. 285 For the critically cleared fault, the two areas Al and A2 (shown in Fig. 10) must be equal and omax = 1r - 00 37 2. 5 Simplified Representation of Excitation Control In the 'classical' approach for dynamic analysis, the excitation controllers were neglected. This is in view of the fact that slow manual control was used till early fifties for voltage regulation.

Each. Find the maximum step increase in the mechanical power that will not cause transient instability. Use equal area criterion. 1. 9 Solution At the initial operating point, where (h and (J2 are angles of the voltages Vi and V2. 5 .. J. 56°. 56 35 2. Review of Classical Methods D. D. D. 121 . 0. 1°} to 81 (see Fig. 18). When there is a step increase in Pm the machine accelerates and overshoots the equilibrium angle 81 . Let the maximum angle reached be 8max . For critically stable case, 8max = 11" - 81 (see Fig.

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