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A neutral-point-clamped three-level PWM rectifier is studied in the paper. The naturally decoupled state-space equations in stationary reference frame (α-β) were derived. Furthermore, a new PWM method for input current harmonic of rectifier is presented including asymmetrical regular sampling and DC-bus voltage balancing. The hierarchical controller structure is adopted and can be divided as the inner...
Three phase three level neutral point clamped (NPC) rectifier is a popular topology for power converter front-ends to achieve controllable DC voltage. In this paper, its mathematical model is analyzed and a dual-loop control strategy is adopted to regulate both DC voltage and input power factor. Instead of space vector PWM, an improved multi-level carrier based PWM is presented. The control system...
This paper presents design, modeling, and control of grid interconnection for a wind farm with round-rotor synchronous generators. The grid interconnection proposed in this paper supports the variable-speed wind turbine concept with the three-phase diode bridge as a front-end rectifier. The wind energy resources and the utility grid are isolated by intermediate fly-back converters. The grid interface...
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