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Four kinds of compound carrier disposition PWM schemes are discussed, two of which are proposed for the first time in the paper. Methods for analyzing the amplitudes and harmonics of the output voltage of single-phase multi-level cascaded inverter are introduced for these PWM schemes, whose carrier waves could be equivalent to the ones of phase-shifted-PWM. Features of these PWM schemes are summarized...
This paper describes the distribution level static compensator (D-STATCOM) of three-phase three-wire distribution system for unbalanced load compensation. First, a novel transformer-isolated multilevel H-bridges inverter is introduced, which is suitable for large unbalanced load compensation. For solution to improve the power quality at the point of common coupling (PCC), the compensation scheme is...
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