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Power System Stability

Recent Trends in Power System Stability

Recent Trends in Power System Stability: Recent Trends in Power System Stability in design of large alternators tend towards lower short circuit ratio (SCR = 1/Xd), which is achieved by reducing machine air gap with consequent savings in machine mmf, size, weight and cost. Reduction in the size of rotor reduces inertia constant, lowering thereby …

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Factors Affecting Transient Stability

Factors Affecting Transient Stability: Factors Affecting Transient Stability – The two-machine system can be equivalently reduced to a single machine connected to infinite bus bar. The qualitative conclusions regarding system stability drawn from a two-machine or an equivalent one-machine infinite bus system can be easily extended to a multimachine system. In the last article we …

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Node Elimination Technique in Power System

Node Elimination Technique in Power System: In stability studies, it has been indicated that the buses to be considered are those which are excited by the internal machine voltages (transient emf’s) and not the load buses which are excited by the terminal voltages of the generators. Therefore, in YBUS formulation for the stability study, the …

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Power Angle Equation of Synchronous Machine

Power Angle Equation of Synchronous Machine: Power Angle Equation of Synchronous Machine – In solving the swing equation (Eq. (12.10)), certain simplifying assumptions are usually made. These are: Mechanical power input to the machine (Pm) remains constant during the period of electromechanical transient of interest. In other words, it means that the effect of the …

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