1,720,982 research outputs found
Three-Phase Z-Source Power Supply Design
No full textZ-source converter configurations make it possible to overcome intrinsic limits present in conventional ac–dc and dc–ac converters. A typical three-phase inverter cannot supply output voltages greater than the voltages at its input; in the same manner, a typical three-phase boost rectifier cannot supply output voltages lower than input voltages. Using Z-source topology permits overcoming both these limits. In fact, a Z-source boost rectifier can theoretically either step-up or step-down the output voltage to any desired value starting from the conventional three-phase diode bridge rectifier output voltage level. In addition, it presents intrinsic immunity to shoot-through states, resulting in improved reliability of the entire system. In this study, attention is focused on the mathematical modelling of a three-phase Z-source boost rectifier for power factor correction power supply applications; using such a topology as first-stage converter allows designing the second-stage converters with the same voltage constraints of single-phase units
Sinusoidal Current Shaping in Variable-Speed Distributed Generating Units with Low-Resolution Position Sensors
No full text
Single-Phase Three-Level Transformer-less Inverter for Residential Distributed Generation
No full textIGBT-SiC dual fed ground power unit
Full text linkThis paper presents the design and control of a three-phase ground power supply unit for aircraft servicing. A new mixed technology converter composed by a three-phase Silicon Carbide (SiC) full bridge unit and a three-phase full bridge IGBT unit connected across the same dc link is used instead of the conventional full bridge configuration. In order to satisfy the stringent requirements of the output voltage quality particular attention is given to the controller. The common dc link topology of the converter allows circulation of Zero Sequence Current (ZSC), therefore also a 0 axis regulator is necessary. The state space model of the system considering the LC output filter is presented and used in order to synthetize the controller parameters using the Optimal Control theory
- …
