2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289)
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A 1/spl phi/3W grid-connection PV power inverter with partial active power filter
Tập 3 - Trang 1512-1517 vol.3
This paper presents a single-phase three-wire (1/spl phi/3W) grid-connection
photovoltaic (PV) power inverter with a feature of a partial active power filter
(PAPF), which can not only deal with PV power but can filter current harmonics
and improve power factor. Once the processed power exceeds the switch ratings,
the inverter can reduce its output reactive power and harmonic power, while
still ca...
#Inverters #Active filters #Power harmonic filters #Reactive power #Power system harmonics #Switches #Power generation #Photovoltaic systems #Solar power generation #Phase detection
An instructional laboratory for the revival of electric machines and drives courses
Tập 2 - Trang 455-460 vol.2
This paper describes the developments at the University of Minnesota of new
approach in teaching of electric drives, focusing on the associate
state-of-the-art laboratory. The mission of these developments is to nationally
revitalize courses in industrially and strategically vital fields of electric
drives (and power electronics). This is accomplished by making these courses
appealing to students ...
#Laboratories #Electric machines #Power electronics #Drives #Continuing education #Digital control #Hardware #Electronics industry #Electric motors #Voltage
Problems of paralleling windings for planar transformers and solutions
Tập 2 - Trang 597-601 vol.2
In today's power converters, paralleling windings in planar transformers is
common, especially for low voltage and high current applications. Although this
practice is usually believed to be an effective way to increase the current
handling capacity of the windings, the effect might not be so significant due to
the unequal current distribution within parallel layers if the layers are not
properly ...
#Transformers #Copper #Current distribution #Frequency #Inductance #Power electronics #Low voltage #Solids #Wire #Assembly
Power integrated circuit drives based on HV NMOS
Tập 4 - Trang 1737-1740 vol.4
This paper presents high voltage (HV) NMOS based level shifters, bootstraps and
charge pumps in direct and cascaded topologies, which are highly useful to
implement either power integrated circuits (PICs) high-side transistor floating
drives or compact inductorless DC-DC power supplies. Monolithic solutions
resorting to a unique HV NMOS switching cell are very important when standard
CMOS technolo...
#Power integrated circuits #MOS devices #Voltage #CMOS technology #Charge pumps #Integrated circuit technology #Costs #Circuit topology #Power supplies #Geometry
Industrial implementation of a controlled sensorless synchronous drive with hard start conditions
Tập 3 - Trang 1167-1171 vol.3
The subject of this paper is a synchronous drive of grinding ball mills 4 MW,
150 rpm, 6 kV, 50 Hz on the base of PWM CSI. The system is installed at the
concentrating plant of Norilsknickel in Russia. Specific to this drive is large
stalling torque-up to 125% of rated torque. This is a sensorless drive. Another
specific feature is the necessity of synchronization with power system and
switching t...
#Industrial control #Sensorless control #Torque #Power system simulation #Pulse width modulation #Synchronous motors #Milling machines #Frequency #Voltage #Automatic control
Single-switch zero-voltage-switching high power factor electronic ballast
Tập 2 - Trang 773-778 vol.2
This paper introduces two modified Class E circuits to achieve low crest factor
of lamp current. By integrating flyback topology with Class E converter, the
modified circuits can achieve improved lamp current crest factor, and still
maintain high power factor and zero-voltage-switching features in conventional
Class E converter. Simulation and experimental results are presented to verify
the theor...
#Reactive power #Electronic ballasts #Circuit topology #Fluorescent lamps #Frequency #Voltage #Switching converters #Switches #Inverters #Power generation
A disk-type bearingless motor for use as satellite momentum-reaction wheel
Tập 4 - Trang 1971-1975 vol.4
This paper describes the development of disk-type bearingless motor for
application as a satellite momentum/reaction wheel. It does not rely on
mechanical bearings, so does not require lubrication and can be expected to have
longer maintenance-free lifespan that is important in space applications. The
proposed motor has a shaft-less disk-type rotor sandwiched between two disk-type
stators and has ...
#Satellites #Rotors #Magnetic levitation #Wheels #Mechanical bearings #Lubrication #Stators #Flywheels #Motion control #Finite element methods
Inverters for single-phase grid connected photovoltaic systems-an overview
Tập 4 - Trang 1995-2000 vol.4
An overview on developments and a summary of the state-of-the-art of inverter
technology in Europe for single-phase grid-connected photovoltaic (PV) systems
for power levels up to 5 kW is provided in this paper. The information includes
details not only on the topologies commercially available but also on the
switching devices employed and the associated switching frequencies, efficiency,
price tr...
#Inverters #Photovoltaic systems #Topology #Voltage #Switching frequency #Switches #Power engineering and energy #Australia #Power system economics #Power generation economics
Utility-connected power converter for maximizing power transfer from a photovoltaic source while drawing ripple-free current
Tập 3 - Trang 1518-1522 vol.3
This paper presents a power converter for coupling photovoltaic arrays to the
utility grid. The converter draws a programmable, ripple-free DC current from
the photovoltaic array and injects power into the grid at unity power factor.
The programmable input current feature makes this converter ideal for use with
maximum power point tracking technology. The proposed converter has an
additional uniqu...
#Photovoltaic systems #Solar power generation #Reactive power #Voltage #Capacitors #Information analysis #Information filtering #Information filters #Control systems #Hardware
Robust adaptive control of a 3-axis motion simulator for instruments testing
Tập 2 - Trang 552-557 vol.2
In this paper, a 3-axis motion simulator is proposed to provide a laboratory
environment for testing spacecraft instruments. A mathematical model of the
simulator mechanical structure is developed by means of calculating angular
momentum of each rotating part with respect to relevant reference frames. Motion
simulator actuators are permanent magnet synchronous motor (PMSM) drives. A
compact mathem...
#Robust control #Adaptive control #Instruments #Testing #Mathematical model #Robust stability #Space vehicles #Actuators #Permanent magnet motors #Electromechanical systems