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Fault-tolerant energy saving ac electric drive

Work number - M 17

Submitted by Kremenchuk Mykhailo Ostrogradskyi National University

Authors: Kostenko Anna Viktorivna, Maliakova Mariia Sergiivna, Melnykov Viacheslav Oleksandrovych, Romashihina Zhanna Ivanivna

The aim is to improve energy efficiency and to increase the service life of the regulated AC electric drive by the development of scientific bases and implementation of energy saving management systems, providing fault tolerance in all electrical complex.

The authors have developed new and improved existing methods of correction of induction motors (IM) modes with damages in the power of the stator electric circuit, allowing to improve energy performance and to increase the service life of the frequency-controlled electric drive with scalar and vector control.

It was implemented and developed the indirect method of determining the energy characteristics of the IM as a part of AC drives, which allows to assess its performance in terms of parameters asymmetry of the electromechanical transducer without outputting the  IM from the process.

For the first time, it was developed and implemented the method for defects diagnosis and assessing the overall technical condition of IM based on the analysis of the frequency spectrum and the integral characteristics of consumed three-phase power of IM, which is formalized in the form of logical rules to detect defects and damages.

It was implemented the developed method for fault diagnosis of IM broken rotor bars, based on the analysis of the electromotive force signal, which is induced in the stator windings by the damping rotor currents in the coasting mode, which overcomes from the influence of the supply voltage quality, fluctuations and load level, and allows to determine the damaged rotor bars without IM outputting from the process, dismantling and installation of the additional sensors into the IM structure.

It was developed the separation and the balancing voltage signal subsystems, which allows to improve the compensation methods of current non-active components under the nonlinearity and asymmetry of the load. It is realized by the excluding of  the harmonic voltage components, caused by distortion of the network, and the negative and zero-sequence voltages from the algorithm of forming the compensation currents. It allows to increase the efficiency of the power supply systems and to improve the performance of the compensation system.

The estimated economic impact from the implementation of the monitoring system and evaluation of the electric motors service life, which was developed to reduce the number of failures of electric drives, is about 1.5 million UAH.

Number of publications: 63, including 1 monograph, 1 textbook, 49papers (15 - in foreign journals, 13 – are included in theSCOPUS andWeb of sciencedatabases). According to the Scopus database total number of authors citations – 26, h-index (the work) = 7; according to Google Scholar database total number of citations – 77, h-index (the work) = 11. The novelty and competitive technical solutions are protected by 12 patents.