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Modular multilevel converter (MMC) has been a research hotspot in the past decade in the high-voltage high-power applications. The basic working principle is analyzed in depth in this paper firstly. A precise control law is deduced to control the output voltage and the circulating current directly and precisely. Different from the conventional control law, arm inductor voltages are considered in the...
This paper presents the design and implementation of an ultra-high efficient two-stage PV converter consisting of full-bridge DC/DC converter as the first stage and three-level T-type DC/AC inverter as the second stage. Firstly, the operation principles of full-bridge DC/DC converter and DC/AC converter are given in this paper. Then the control algorithm of the converter is analyzed and implemented...
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...
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