New performance indices for the optimization of controller gains of automatic generation control of an interconnected thermal power system

This paper proposes four new performance index (PI) criteria for the optimal tuning of controller gains of automatic generation control. The peak sum squared error (PSSE), peak sum time multiple squared error (PSTSE), peak sum absolute error (PSAE) and peak sum time multiple absolute error (PSTAE) are the new performance Index criteria which have been proposed against the existing criteria given as integral squared error (ISE), integral time multiple squared error (ITSE), integral absolute error (IAE) and integral time multiple absolute error (ITAE), respectively. To demonstrate the robustness of the proposed performance index criteria, the investigations are carried out for non-reheat as well as reheat interconnected thermal power system. Further, the dynamic performance of the proposed performance index criteria have been investigated over the continuous and discrete AGC systems. To firmly testify the superiority of the proposed criteria, discrete AGC system has been analyzed for the wide range of sampling periods. The study also reveals some new findings in discrete data automatic generation control system.