Research of Energy Efficiency of Start-Up of Asynchronous Electric Drives With Scalar Frequency Control

Abstract

In modern industry, a frequency-controlled electric drive is widely used. The development of microprocessor technology has contributed to the creation of frequency converters of various types, which affects the quality of the generated supply voltage. The article discusses the features of the formation of the supply voltage of the frequency converter and the influence of the quality of the generated voltage on the performance of an adjustable electric drive. One of the basic performance indicators of the electric drive is the efficiency, which depends on the energy losses in the system “asynchronous motor - frequency converter”. The study of energy efficiency was carried out for various ways of starting asynchronous electric drives with frequency control. The calculations were performed by frequency control according to the laws of M.P. Kostenko as the most common in use and economically beneficial. The factors that influence the formation of the efficiency factor are considered. The components are presented in the form of mathematical dependencies and are determined by the nature of the current that forms the frequency converter. The analysis of the operation of the system “asynchronous motor - frequency converter” on a mathematical model is carried out. The mathematical model takes into account the nature of the current, which is generated by the frequency converter. Based on the results of the analysis, conclusions were drawn and recommendations were made on the use of frequency control laws when starting and starting the AD-FC system.