A sequence-based control scheme for voltage-source converters in naval and commercial microgrids

Abstract

A switching-sequence-based control scheme for power electronics converters in naval and commercial microgrids is investigated in this paper. The proposed scheme guarantees global stability while meeting predefined performance criteria. First, using techniques based on composite Lyapunov functions and piecewise-linear models of the system, the set of switching sequences that guarantee global stability, is determined. Next, by solving optimization problems using predefined cost functions, the optimal switching sequence and the duration of time spent in it is determined. Applications of the control scheme to multifunctional voltage source converters for naval power systems and a commercial microgrid are presented. Dynamic and steady-state performances obtained using the sequence-based control scheme is compared with those obtained using conventional linear controllers. Fault conditions are investigated to evaluate the efficacy of the control scheme.