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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 proposes a predictive algorithm for AC-DC three phase converter with active power factor correction. The control proposed does not have current feedbacks and the input current levels are controlled by the DC voltage loop. The main idea of this algorithm is to take the three phases converter like a sequence of two converters working simultaneously and the equations modeled was approximated...
PFC converters for higher power are commonly designed for continuous conduction mode (CCM). However, at light load, discontinuous conduction mode (DCM) will appear close to the crossover of the line voltage, causing the converter to switch between the two conduction modes. As a result, the converter dynamics change abruptly, producing input current distortion. In this article a piecewise affine approximation...
Direct-drive wind power system needs a full-scale power converter to transmit the variable frequency electrical power to the grid. In order to improve the low voltage ride through (LVRT) capability, the grid-connected inverter (GCI) should work at a unity, a leading or a lagging power factor. Traditional control methods are complicated and output waveform is distorted by dead time. This paper introduces...
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