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For solid round rotor body synchronous machines saturation effects are significant in both dand q-axis, and because of this non linearity, the dand q-axis ma maaxis ma axis andq-axis magnetizing reactances are depressed to a considerable degree from their unsaturated values under both steady-state and transient operations. In this type of synchronous machine q-axis saturates appreciably more than that of the d-axis because of the presence of the rotor teeth in the magnetic path of the q-axis. This paper first presents a new method to calculate the q-axis saturation characteristic from the existing d-axis saturation characteristic. Next the effects of considering a separate q-axis saturation characteristic on the power system steady-state and transient stability have been presented.

Analysis of the Effects of Synchronous Machine Saturation on the Power System Steady State and Transient Stability