Abstract : One of the major problems in power system operation is related to small signal instability caused by insufficient damping in the system.

The most effective way of countering this instability is to use auxiliary controllers called Power System Stabilizers, to produce additional damping in the system.

Generally Heffron-phillip‟s Model of a synchronous machine is commonly used for the small signal stability analysis.

A Modified Heffron-Phillip‟s (K-constant) Model is derived for the design of Power System Stabilizers; knowledge of external parameters, such as equivalent infinite bus voltage and external impedance value are required for designing a conventional power system stabilizer, Modified Heffron-Phillip‟s Model power system stabilizer.

The efficiency of the proposed design technique and the performance of the stabilizer has been evaluated over a range of operating and system conditions and the performance of the proposed Modified Heffron-Phillip‟s Model is much better than the conventional power system stabilize.

The proposed work describes the ĄDesign of Power System Stabilizer by using Modified Heffron-Phillip‟s model‟ is simulated by using MATLAB/SIMULINK.

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