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Three level neutral-point-clamped(NPC) single-phase cascaded inverter is used in advanced cophase traction power supply system. Because a lot of power modules and switches are used, reliability of this system could be decreased. To diagnose fault of cascaded inverter, different fault types of individual module are analyzed. A fault diagnostic method is proposed to diagnose open circuit fault of single-phase...
On the background of an AC/DC hybrid microgrid on a small island, operation mode of the microgrid was divided into diesel generator power supply independently, inverter power supply independently and compositive power supply according to the cooperation of the diesel generator and the interface inverter. Switch control strategy of the microgrid operation mode was proposed in this paper based on hierarchical...
In order to reduce the impact of current and voltage effectively, when the dual-mode inverter grid-connected/off-grid mode transfer in the micro-grid system. There is a uncontrollable parameter perturbations influence in the transfer process of grid-connected/off-grid. This paper presents micro-grid dual-mode inverter which take H∞ robust controller in current inner loop, reducing external disturbances...
This paper presents a new application of power and voltage balance control schemes for the cascaded H-bridge multilevel inverter (CHMI)-based solid-state transformer (SST) topology. To reduce load on the controller and simplify modulation algorithm, a master–slave control (MSC) strategy is designed for the dual active bridge (DAB) stage. The master controller executes all control and modulation calculations,...
A sensorless direct torque controlled (DTC) induction motor drive fed by a 3-level inverter is presented based on discrete space vector modulation. A novel vector synthesis sequence is proposed to solve the problems caused by the topology of the 3-level inverter, such as neutral point unbalance and excessive voltage jump, while maintaining the merits of simplicity and robustness. Fuzzy logic control...
The basic direct torque control (DTC) scheme may cause undesired torque, flux and current ripples because of the small number of applicable voltage vectors. The discrete space vector modulation (DSVM) method was proposed for DTC to overcome this problem by applying more vectors in one interval. In this paper, after a brief review of the primary concept of DSVM DTC technique, a new scheme of DSVM DTC...
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