The shipboard electric power system is an independently operated system. The external help will not be immediately available if machine failure or contingency occurs when the ship sails on the sea. Moreover, the required reliability of the shipboard electric power system is higher than that of the seashore power system since the frequent load variations on board are likely to result in system instability.
In order to study the dynamics of the shipboard electric power system under various loading states, we adopt a sample study system of which the equivalent dynamic models under four operating conditions are established. Then based on time-domain performance indices, such as maximum overshoot, rise time, and settling time, we are to find the proper parameter of the automatic voltage regulator in the excitation system. To verify the effectiveness of parameter tuning in improving the system dynamic characteristics, the time-domain approach is also employed to compare the system responses subject to large disturbance before and after the adjustment of automatic voltage regulator gain parameter. It is found that proper setting of the gain parameter for automatic voltage regulator is capable of improving the system dynamic characteristics.