The need for advanced materials capability has never been as great as at this time in our nation's history. Energy shortages demand more efficient operation of existing equipment of all types as well as new and imaginative methods of power conversion. Advanced materials are the key to achieving improved performance via higher cycle operating temperatures, lighter structural components, and adeq...

In multiple-pass nonlinear frequency conversion devices, interacting waves may accumulate different phases, owing to dispersive elements in the system. Phase compensation is therefore necessary for efficient frequency conversion. We experimentally demonstrate phase compensation in a compact semimonolithic frequency-doubling cavity by using a periodically poled KTP crystal. The conversion effici...

This paper presents system stability analysis of DFIG based wind energy conversion system. Presently for variable wind speed DFIG is considered as efficient machine to generate the power. In addition to this advanced AC/DC/AC converters with closed loop control system has been presented. For stability analysis 1.5MW wind turbine has been considered. As the speed of the wind varies by ± 18% to 2...

MIRZAEE TESHNIZI, HESAMEDDIN. Medium-Voltage DC Power Conversion and Distribution for Efficient Electric Power Delivery in Shipboard and Mobile Mining Application. (Under the direction of Dr. Subhashish Bhattacharya). Medium-Voltage DC (MVDC) distribution and power conversion systems have become more attractive in recent years due to advances in power electronic technology. It can be used in a ...

This paper investigates a novel single stage AC–AC power conversion, as an alternative to multistage AC– DC–AC power conversion topology, for interfacing the wind energy conversion system (WECS) to a grid as a distributed load system. A comprehensive dynamic model of proposed AC–AC converter is developed to satisfy all the functions of the converter. A new time switching pattern and a control m...

A new dc current reference standard has been developed for high-current power converter calibration in the large hadron collider (LHC) project at the European Organization for Nuclear Research (CERN). This standard provides a near ideal 10-mA dc current with long-term drift of one part in 106 per year. The paper describes the requirements and the detailed design and evaluation of the unit. Sinc...