Load shedding via PID controller for an isolated power system

Excess load may cause the frequency to drop to a level that may result in permanent damage to steam turbines. Since an isolated power system possesses a lower inertia with limited reserves, load shedding becomes a critical solution to restore system frequency. This paper presents a load shedding scheme determining the slope calculation based on the initial frequency variation based on [10]. The steps are determined with initial rate of change of the frequency considering the impact of proportional, integral, and derivative controller. The load shedding scheme has been implemented with different step load changes in the system. The comparison of the results of load shedding without and with controller has been obtained. The impact of the parametric variation has also been studied for deciding the parameters for minimum values of the load shed to maintain the frequency within the limits.