A multilevel converter-based universal power conditioner

This paper presents the development of a control scheme for a multilevel di ode-clamped converter connected in a series-parallel fashion to the electri cal system such that it can compensate for deviations in utility voltage (s ag, surge, and unbalance) and act as a harmonic and/or reactive current sou rce for a load. New carrier-based multilevel pulsewidth modulation techniqu es are identified to maximize switch utilization of the two back-to-back di ode-clamped inverters that constitute the universal power conditioner. An e xperimental verification for a six-level power conditioner is given.