A new passive 28-step current shaper for three-phase rectification is proposed in this paper. With a phase-shifting transformer on the ac side and six interphase transformers on the dc side, per-phase input current can be shaped into a 28-step sinusoidal waveform. The total harmonic distortion of ac input currents obtained is 6.54%, lower than one-half of that in a conventional 12-pulse convert...

This paper describes the development of high voltage power supply for electro-optics applications. The power supply consists of MOSFET driver, voltage multiplier circuit and voltage controller. A single timer 555 generates 1.3 kHz square pulse to drive the power MOSFET that connected to a standard step up transformer. By using voltage multiplier technique, the output from secondary transformer ...

This paper presents the envisioned next generation power distribution system architecture, the so called FREEDM system. The presented system enables the plug-andplay of distributed renewable energy resources and distributed energy storage devices, therefore functions as the “energy internet”. The recent technical developments are summarized in this paper, with emphasis on the distributed grid i...

This paper introduces a novel two transistors forward topology employing a z-source to achieve ZVZCS and power transformer resetting for various applications. Comparing with the forward converter, this topology has the advantage of displaying ZCS condition with an added Z-Source and no additional switches when the switches turn on, and that ZVS condition happens when the switches turn off. Duty...

To provide transmission-line voltage support, a static compensator (STATCOM) offers the optimal solution in terms of price, reliability, and dynamic performance. Simpler layout for switches, reduced component count and smaller dc-link capacitor values are the attractive features of the proposed topology over the diode clamped and cascaded multilevel converter. Two dc-link voltage sources with v...

Submitted: Apr 21, 2013; Accepted: Jun 4, 2013; Published: Jun 22, 2013 Abstract: This paper presents a pulse doubling technique in a 36-pulse ac-dc converter which supplies direct torque-controlled motor drives (DTCIMD’s) in order to have better power quality conditions at the point of common coupling. The proposed technique increases the number of rectification pulses without significant chan...