The power electronics part of this lab practical uses training panels. The electrical machine employed is an industrial machine on a base, whereby the characteristics of the machine can be determined using the Machine test system 0.3. Power is supplied to the machine under test via an educationally designed frequency converter, which obtains its power from the normal mains (mains voltage, 230 V).
Objectives
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Protective measures and electrical safety
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Set-up of power generating systems according to circuit diagrams
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Putting electrical drives into operation
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Recording of load characteristics with various operating parameters
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Achieving skills in measuring electrical machines
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Automatic speed control for an asynchronous (induction) machine
Power electronics has developed from the technology of static converters to become one of the most important and all-encompassing areas of electrical engineering. The job of power electronics is to switch, control and convert electrical energy using power semiconductors with the best possible efficiency. One key application is drive technology. With the help of modern power electronics, it is possible to construct variable speed drives in DC and three-phase circuits for 4-quadrant operation. In this equipment set, a universal converter is used for open- and closed-loop control of speed for a squirrel cage motor.
Students work in the power engineering lab with mains voltage. Experiments procedures are contained in a printed manual.
The experiments are designed for intermediate and advanced levels.
Topics
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Rotating field and space vectors
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Modulation types: square, trapezoidal, sinusoidal, pulse width modulation (PWM)
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Voltage vector control VVC
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Magnetisation with a linear V/f characteristic
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Boosting of magnetisation by means of the start voltage
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Optimisation of load characteristics by means of IxR compensation
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Slip compensation
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Operation of the motor in a star configuration
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Computer-assisted measurement and evaluation using CBM 10 software
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Recording a load characteristic
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Comparison of multiple load characteristics
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Brake choppers
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Variable-speed drives
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