Inspec keywords: switching convertors; Petri nets; DC-DC power convertors; voltage control; choppers (circuits); observability

Other keywords: load variation; Petri nets; switching cells; Z(TN) observability; dynamical equations; parallel multicell chopper; voltage output regulation; DC-DC static power converter; observability problems

Subjects: Power convertors and power supplies to apparatus; Combinatorial mathematics; Combinatorial mathematics; Control of electric power systems; Voltage control