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This paper presents a novel space-vector current-control strategy for three-phase neutral-point (NP)-clamped inverters. The main task of this control technique is to force the actual current vector to reach the reference current vector. This original strategy consists in defining three circular hysteresis bands around the error vector. Then, according to the location of this error vector, a selection...
Nowadays, there is a tendency to increase the power of wind turbines. Multilevel converter is a realistic alternative in such high power applications. As the most widely used variably speed wind turbine, doubly fed induction generators (DFIG) are very sensitive to grid disturbances. Moreover, grid codes have been revised to require wind turbines to provide Low Voltage Ride-Through (LVRT) ability....
One of the most inherent problems of the multi-level NPC topology is to maintain the neutral point voltage in a narrow band around the half of the DC voltage. This paper presents a DC-link voltage balancing algorithm for three-level voltage source inverter using a new space-vector based on hysteresis current control (SV-HCC). The proposed SV-HCC controls the active and reactive power delivered to...
The studied application is a back to back power electronic structure feeding a three-phase load. The line side converter is a two-level PWM rectifier controlled by a current hysteresis controller in the abc reference frame. It regulates the dc voltage and enables a unit power factor. The load side converter is a three-level voltage source inverter (VSI), which is controlled by means of a novel vector...
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