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This paper presents a Space-Vector Modulated (SVM) Direct-Torque-Control (DTC) scheme for a direct-drive permanent magnet synchronous generator (PMSG) and a gird converter for wind energy without any position sensor. Direct control of the rotating velocity and amplitude of the stator flux vector allows very fast torque response of the PMSG according to the generator speed. Fixed switching frequency...
Shorted stator induction generator (IG) is presented for low wind speed power application. An analytical model is derived for predicting electrical performance of the generator while operating in regions 1 and 2 of turbine power versus wind speed curve. This paper determines an explicit optimal stator electrical speed of operation since the stator is disconnected from synchronism with the grid. A...
Bucket wheel excavators, spreaders, mobile crushers, movable belt conveyors and other machines on open pit mines are huge tracked vehicles with slow speed of movement. To be able to move on mine's terrain, the machines are equipped with crawler mechanism for support and transport. Crawler chain serves for transformation of rotation of drive tumbler to linear movement of tracked vehicle. This transmission...
This paper presents modeling and simulation of electric drive system for a hybrid electric vehicle which consists of a diesel engine, a flywheel-type PM generator and its converter, a Li-ion battery pack, six in wheel-type PM motors and their inverters. Only one set of the six motor/inverter sets is taken into account for the simplicity of modeling, since all of them have the same structure. This...
This paper presents an analysis and a power coordination technique for a Doubly-Fed Induction Generator (DFIG)-based wind farm with HVDC-link integration. Control and operation of both rotor-side converter (RSC) and grid-side converter (GSC) are analyzed. The RSC control loop tracks maximum wind power and controls stator flux linkage. The GSC control loop maintains stator terminal voltage and dc-link...
Travel drive on open pit mine machines is multi-motor drive, consisting of two, four, six or more motors. This drive is the most demanding drive on the open pit mining machines. The single drives are cross-coupled through terrain, which is rugged and inhomogeneous, making the quasi-stiff mechanical coupling. This is the reason why the relation of coupling between the individual drives permanently...
A high-performance variable-speed drive system using a cycloconverter-fed synchronous machine is described. The principle of the drive control is based on the field-oriented control method. For operating the synchronous machine drive system with high dynamic performance and excellent static characteristics over a wide range from zero to top speed, accurate field orientation and high response current...
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