Search Results - fred wang

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Electrical Power System With High-Density Pulse Width Modulated (PWM) Rectifier

The present invention provides a single phase Pulse Width Modulated (PWM) rectifier for providing power to a direct current (DC) load that may have an increased power density relative to previous systems.

Published: 9/24/2012 | Inventor(s): Ruxi Wang, Fred Wang, Dushan Boroyevich, Rolando Burgos, Kaushik Rajashekara

Keywords(s): Electronics

Category(s): Electrical

Two-Stage Bi-Directional Single-Phase Converter with DC-Link Capacitor Reduction

It is well-known that single-phase ac-dc conversion requires a bulky dc-link capacitor for filtering the ripple power from the grid, thus leading a overall bulky converter size. Also, in order to interface a dc renewable energy system to a single-phase utility grid, bi-directional power flow control and dc-bus voltage regulation are major concerns....

Published: 9/20/2012 | Inventor(s): Dong Dong, Dushan Boroyevich, Ruxi Wang, Fred Wang

Keywords(s):

Category(s): Electrical

An Algorithm and Implementation System Architecture for the Measurement of Impedances in the D-Q Frame Domain

The growing need for a highly reliable electrical supply for critical applications has spawned the development of local distribution systems with the extended use of power electronics. The advantages are numerous. The downside is that the higher interactions within the system can easily lead the system to operate outside its limits due to instabili...

Published: 9/5/2012 | Inventor(s): Gerald Francis, Rolando Burgos, Dushan Boroyevich, Fred Wang, Zhiyu Shen, Paolo Mattavelli, Kamiar Karimi, Sheau-Wei Fu

Keywords(s):

Category(s): Electrical

Small-Signal Stability Criterion for AC Power System Interfaces Feeding Three-Phase High-Power Factor Rectifiers

Published: 9/5/2012 | Inventor(s): Rolando Burgos, Dushan Boroyevich, Fred Wang, Kamiar Karimi

Keywords(s):

Category(s): Electrical

The Use of PLL Stability for Islanding Detection

Quasi-active islanding detection metehod that does not inject distortions into grid via the output of the converter, but rather relies on the stability of the PLL which, with the proposed implementation, inherently senses a grid disconnect and starts to oscillate.

Published: 9/3/2012 | Inventor(s): Timothy Thacker, Dushan Boroyevich, Fred Wang

Keywords(s): Energy/Power

Category(s): Electrical