
In this paper, a carrier-based modulation method with optimal zero-sequence signal injection has been introduced to modulate a four-level π-type converter as well as regulate its DC-link neutral points' voltages. The two neutral points' voltages can be well controlled with a back-to-back configuration even under high modulation index and high power factor. A back-to-back experimental system has been built and tests under 300V have validated this control strategy.
energy efficiency and industrial applications, power converters, 621, modeling, control, 620
energy efficiency and industrial applications, power converters, 621, modeling, control, 620
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