Load Frequency Control for Power Systems via DMC

Load frequency control (LFC) is an important technique in providing good power quality and maintaining safety, reliability and economics of power systems. This paper proposes a PID controller design method via dynamic matrix control (DMC), and applies it to the load frequency control problems. DMC does not need a detailed mathematical model of the controlled plant, and the controller design can be done using the step response of the system, which is simple and can achieve good performance. However, receding horizon DMC needs certain burden of computation and is not easy to implement in a conventional distributed control system (DCS). So this paper approximates DMC to a PID controller utilizing its closed-loop form. Simulation results show that the proposed method can achieve good performance compared with the traditional PID method, with better load disturbance rejection and robustness.