This paper presents a capacitor voltage balancing control applicable to any multilevel dc-ac converter formed by a single set of series-connected capacitors implementing the dc link and semiconductor devices, such as the diode-clamped topology. The control is defined for any number of dc-link voltage levels and converter legs (for single-phase and multiphase systems), guaranteeing the capacitor voltage control for any modulation index value and load (from idle mode to full power). The associated control loop small-signal transfer function is presented, from which optimum compensator design guidelines are derived. The improvement in control performance is verified through simulation and experiments comparing with a previous balancing control strategy in a four-level three-phase dc-ac conversion system. The satisfactory control performance is also verified through simulation in a four-level five-phase dc-ac conversion system. ; Postprint (published version)
Enhanced DC-Link Capacitor Voltage Balancing Control of DC-AC Multilevel Multileg Converters
2015-05-01
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Àrees temàtiques de la UPC::Enginyeria electrònica::Electrònica de potència::Convertidors de corrent elèctric , Voltage -- Regulators , Electric power systems -- Control , Electric inverters , Capacitors , Active-clamped , capacitor voltage balance , diode-clamped , multilevel , pulsewidth modulation (PWM) , virtual vector , diode-clamped converters , pulsewidth modulations , space-vector , inverter , pwm , systems , design , drives , implementation , STATCOM , Reguladors de voltatge , Sistemes de distribució d'energia elèctrica -- Control , Convertidors continu-altern , Condensadors
DDC: | 629 |
NTRS | 1986
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