Power Electronics Training System Model – LabVolt Series 8010-A

Lab-Volt’s 8010-A System is a system that allows
teaching of DC power electronics, DC motor drives, single-phase, three-phase
and thyristor power electronics, as well as three-phase motor starters and
motor drives. Let’s take a look at the equipment needed to teach this. It uses a 48 volt lead acid battery
pack as well as our four-quadrant
dynamometer/power supply; in the power supply mode it supplies
either up to + or – 150 volts and can also be used as a current source.
The IGBT chopper inverter can be used either with a single transistor, two
transistors, to create an H-bridge or to create a
three-phase bridge. There is also a dumping resistor to
prevent over voltages on the DC bus. There is protection against overheat, overvoltage and overcurrent. All of the
gates signals can be observed on an oscilloscope or using our data
acquisition system. A variable resistive load allows seeing
the influence of the load on the circuit, and a variety of filtering inductors and
capacitors allows switching frequency to be varied from 400 Hertz up to 20 Kilohertz. Data acquisition and
control interface features four high- voltage and high current inputs that are
fully optically isolated, as well as enough analog inputs to be
able to observe all of the gates and triggering
signals. The control of the IGBT gate is as simple as connecting the inputs of
the gates to the output of the data acquisition. The system also allows you to take
control of your transistors by controlling things such as the duty
cycle, the switching frequency, acceleration and
deceleration time, as well as selecting the configuration
from a multitude of different functions. Once connected the data acquisition
allows you to see all of the pertinent signals on the oscilloscope. Using the four-quadrant dynamometer
to control the torque and to speed of the DC permanent magnet motor, the students will then create a buck
chopper drive, a buck boost chopper drive, and a four-quadrant chopper drive. They will also do a DC motor control
using speed and current feedback. Using the rectifier and filtering
capacitors along with transformers, the students will then study power diode
single-phase rectifiers, single phase PWM inverters as well as three-phase rectifiers, single-phase PWM
inverters with dual polarity DC bus, and three-phase PWM inverters. The power thyristor module will be
controlled with LV-DAC as well. The individual SCRs can be linked
together using two separate switches and the firing control signals can be
seen on the oscilloscope as well. The students will though study
the power thyristor, single-phase AC power control as well as
three-phase AC power control, thyristor three-phase rectifier inverters, and solid state relays. Using the
three-phase squirrel cage motor the students will then study direct
online starters, soft starters, and creative three-phase variable
frequency induction motor drive, and also a three-phase variable-frequency
induction motor drive with constant V/F ratio. The power electronic system opens easily
to high-frequency transformers, home energy production, transmission
lines, and so on. The system features real power signals while allowing full observation of all
the relevant signals and full control of this system power
meters, making it a powerful and flexible teaching system.

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