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A. G. Vorontsov
A. G. Vorontsov
Saint Petersburg Electrotechnical University "LETI", named after V.I.Ulyanov (Lenin)
Saint Petersburg Electrotechnical University "LETI", named after V.I.Ulyanov (Lenin)

Articles

Electromechanics and mechanical engineering
  • Date submitted
    2019-03-31
  • Date accepted
    2019-08-25
  • Date published
    2020-02-25

Cascade frequency converters control features

Article preview

The structures of systems with high-voltage cascade frequency converters containing multi-winding transformers and low-voltage low-power converters connected in series at each output phase of the load are considered. Low-voltage blocks contain three-phase diode or active rectifiers, DC capacitor filters, single-phase stand-alone voltage inverters and block disconnecting devices in partial modes (in case of failure when part of the blocks are disconnected). The possibilities of operation of cascade converters are determined, equations for correcting tasks to units in partial modes are given, tables of correction of tasks with estimates of achievable load characteristics are proposed. The results of experiments on the model of a powerful installation with a cascade frequency converter are presented, confirming the possibility of ensuring the symmetry of the load currents when disconnecting part of the blocks and the asymmetry of the circuit.    

How to cite: Vorontsov A.G., Glushakov V.V., Pronin M.V., Sychev Y.A. Cascade frequency converters control features // Journal of Mining Institute. 2020. Vol. 241. p. 37. DOI: 10.31897/PMI.2020.1.37