Frequency regulation in interconnected power system with DFIG participation under ABT-based various operating strategies

Abstract

The implementation of various operating strategies based on the Availability Based Tariff (ABT) in a two-area interconnected power system with thermal and DFIGs in each area for frequency regulation is investigated in this paper. A suitable Generation Control Error (GCE) signal is needed to regulate frequency and tie-line power flow in an ABT-based operating strategy. This signal combines marginal generation cost and frequency-dependent unscheduled generation cost. A GCE signal generated in succession by three distinct operating strategies controls all thermal generators. To determine the best ABT-based operating strategy for the system under consideration, a simulation study is performed to compare and analyse the corresponding system responses. The operating strategy that utilises GCE, which is the difference between unscheduled interchange charges and marginal cost from their reference values, performed better than the other frequency regulation operating strategies. Furthermore, the simulation study compares traditional and identified ABT-based better control strategies.