Using multi-stack and variable-speed-drive systems to reduce laboratory exhaust fan energy

Modeling and Control of Direct Drive Variable Speed Stand-Alone Wind Energy Conversion Systems

This paper proposes a small wind energy conversion system comprises permanent magnet synchronous generator (PMSG), uncontrolled rectifier, conventional H-Bridge inverter and dc-dc bi-directional converter. The dc link capacitor is connected to a storage system through Bi-directional power flow link. A hybrid pulse width modulation (HPWM) controller is used to regulate the ac load voltage and fr...

Design and Simulation of Double Loop Control for Power Converter Fed Variable Speed DC Drive

Review of Variable Speed Drive Technology By

Variable speed drive technology has advanced dramatically in the last 10 years with the advent of new power devices and magnetic materials. This has given rise to substantial confusion by users and specifiers of variable speed drive equipment. Add to that the difficulty in evaluating efficiency and power factor and the subject of drive selection becomes a daunting task indeed. There is no singl...

The drive to reduce emissions and energy consumption

Variable-speed drives (VSDs) control the speed of machinery, pumps, mixers, fans and compressors to match the needs of the process. In many applications VSDs save so much energy that their economic payback time is only a matter of months. A new approach to the assessment of environmental impacts shows that the environmental payback time of VSDs can be even shorter, in many cases as little as on...

Flow Air And Gas Exhaust Fan Drive Unit Anechoic Test Chamber Flow Management System

The features of the data acquisition and control systems of the NASA Langley Research Cen-ter's Jet Noise Laboratory are presented. The Jet Noise Laboratory is a facility that simulates realistic mixed ow turbofan jet engine nozzle exhaust systems in simulated ight. The system is capable of acquiring data for a complete take-oo assessment of noise and nozzle performance. This paper describes th...