Search Results - dong sam ha

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Islanding Detection Using Phase-Locked-Loop Small-Signal Instability For Three-Phase Power Inverters
A simple and effective anti-islanding detection is required to meet IEEE standard 1547 for every distributed generation unit. Many research papers and patents work on this issue, and there exists lots of solutions. All the existing solutions suffer the complicated design and lots of implementation procesess. Some of them tend to destabilize the gri...
Published: 9/20/2012   |   Inventor(s): Dong Dong, Dushan Boroyevich, Paolo Mattavelli, Bo Wen
Keywords(s):  
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
Anti-Islanding Detection Algorithm and Modeling Approach for Three-Phase Distributed Generation Unit
A simple and effective anti-islanding detection is required to meet IEEE standard 1547 for every distributed generation unit. Many research papers and patents work on this issue, and there exists lots of solutions. All the existing solutions suffer the complicated design and lots of implementation processes. Some of them tend to destabilize the gri...
Published: 9/14/2012   |   Inventor(s): Dong Dong, Dushan Boroyevich, Paolo Mattavelli
Keywords(s):  
Category(s): Electrical
DC Leakage Current Reduction for Single-Phase Full-Bridge Converter
The switching-frequency dc leakage current issue exists in the single-phase full-bridge topology with the unipolar modulation switching scheme. It is important to reduce the leakage current, which has a negative impact on the solar panels. With the emerging market on solar inverter, there are lots of patents filed by different companies on solving ...
Published: 9/14/2012   |   Inventor(s): Dong Dong, Fang Luo, Dushan Boroyevich, Paolo Mattavelli
Keywords(s):  
Category(s): Electrical
Proposed Hybrid Control Method for Digital PWM
This invention proposes a new DPWM control method. This method combines the ideas of constant frequency and constant on-time control. On the one hand, this method can achieve the same duty cycle resolution of constant on-time control, which is much higher than constant frequency control; on the other hand, it keeps the switching frequency nearly ...
Published: 9/3/2012   |   Inventor(s): Jian Li, Dong Sam Ha, Yang Qiu, Ming Xu, Fred Lee
Keywords(s): Communications
Category(s): Electrical
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