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Robust IMC-PIDA Controller Design for Load Frequency Control of a Time delayed Power System

This paper proposes an internal model control (IMC) based proportional-integral-derivative-acceleration (PIDA) control scheme design for an time delayed power system. The distinct feature of the presented IMC tuning approach is that IMC filter coefficient (λ) is selected based on maximum sensitivity (Ms) and communication time delay (td) constraints. The relationship between λ, td and Ms shows the trade-off between performance and robustness. The proposed control scheme is applied for load frequency control (LFC) problem of power system with inclusion of communication time delay. This problem occurs due to sudden load demand. The LFC regulates the frequency deviation in power system. The performance analysis of the proposed control scheme is done on a single area power system with communication time delay. The effectiveness of the proposed IMC-PIDA controller is analyzed in presence of parametric uncertainty, step & random load disturbances, and the system nonlinearities. Finally, the efficacy of the proposed control approach is presented by comparing with the recently published schemes.