Examination of modern electric drives equipped with network-friendly converter

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Dr. Balázs Gergely György
Department of Electric Power Engineering

Nowadyas are widespread the one- and threephase converters, which are connected to the electrical energy supply with a “network-friendly” line-side converter. As it has signifficant adventages compared with conventional converter with diode rectifier, such as bidirectional power flow, low harmonic distortion of input current, high power factor (near unit) and controllable DC-link voltage. These benefits are important because the modern energy consumers and producers process the electrical energy mainly in the form of direct current (or voltage), and the equipment for their operations require a stabilized DC voltage.

This thesis provides an overview of the modern network-friendly line-side voltage inverters, the induction motor drive with field oriented control, the functioning of the current vector control and deal with a variety of detailed simulation models and simulations. The simulation environment is able to examine the effects of to the network-friendly converters DC-link connected various load on the network. The results of the simulations were as expected, it models the different operating conditions at various conditions. The controlled current components had correspondingly results at line-side, the shape of the network current was nearly sinusoidal, his time function moves relative to the supply voltage with the same phase in motor operation, in generator operation with opposite phase.


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