Amitava Sil¹ and S Paul², ¹Neotia Institute of Technology, India and ²Jadavpur University, India

The D-K iteration method of controller design combines H∞ synthesis that ensure robustness and μ-analysis that takes care of parametric uncertainties, and yields a good performance of the robust controller. The idea is basically to find a controller that minimizes the peak value over frequency of the upper bound on μ. This robust control technique is applied for thePower System Stabilizer design for a Single Machine Infinite Bus (SMIB) system, which has already proved to be a successful tool in mitigating low frequency oscillations caused by small disturbances and for improving damping characteristic of a power system. Robust control toolbox of MATLAB has been used for the design. The effectiveness of the proposed PSS for wide range of operating conditions has been shown for the SMIB system with the help of simulation with MATLAB.

H∞ Control theory, robustness, D-K Iteration, Power System Stabilizer, stability