engleski

Influence of Adjustable Speed Drives with Large Induction Motors on Supply Network

By means of a mathematical model for 6 kV, 50 Hz auxiliary consumption supply network in a thermo electric power plant (TEPP) the content of the voltage and current higher harmonics which would cause adjustable speed drives (ASDs) 2*7200 kW of feeding water boiler pumps has been calculated. The calculations and analysis have been carried out for 6-pulse and 12-pulse frequency converter rectifier connections with various combinations of LC resonance filters on a supply network observing the regulations for higher harmonics of the allowed content. The results represent the basis for equipment chice when feeding water boiler pump non-regulated drives are replaced by ASDs.

induction motor; adjustable speed drive; power supply network; frequency converter; higher harmonics

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