An advanced LFC design considering parameter uncertainties in power systems

In this paper, we propose a designing method of the load frequency control, which is able to consider uncertainties in power systems. We design the control system utilizing PID controllers for an H_∞ control problem. Even though many advanced control theories have been established, most industrial controllers still use conventional applications such as PI, PID, and simple first-order lag/lead compensators. The H_∞ control theory can deal with many robust stability and performance problems. We especially pay attention to the inertia constant, the damping coefficient, and the synchronizing coefficient because these parameters change their values or have some errors depending on conditions of the power system. As an example, we design a case of a two-area system, and carry out simulations to compare the proposed method with a conventional method (a PI type controller). As the results of the simulations, we can confirm the effectiveness of the proposed method.