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Multilevel converters are used in medium voltage high power applications. In this field, switching losses are an important efficiency issue due to long term operation costs. Previous works have centered the analysis in comparing different topologies or semiconductors in relation to switching losses. However, switching loses are closely related to the modulation method employed to control the converter...
A novel formulation of quarter-symmetry SHE-PWM problems for five-level voltage inverters is proposed. The SHE modulation scheme features a broad solution space and can eliminate a large number of low-order harmonics. An effective method for obtaining initial values of switching angles is proposed. To illustrate the effectiveness of the proposed SHE method, a five-level voltage source inverter with...
A novel three-phase PWM rectifier-inverter topology for UPS applications is proposed in this paper. The topology uses only nine IGBT devices for AC/AC conversion through a quasi DC link circuit. This converter topology features sinusoidal inputs and outputs, unity input power factor, and more importantly, low manufacturing cost. The operating principle of the converter is elaborated and a novel modulation...
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