| Abstrakt: |
When testing asynchronous machines, it is important to use energy-efficient methods, for example, a method for mutual loading of two machines with articulated shafts. One of the machines operates in the mode of an engine powered through a frequency converter, while the other machine operates in the mode of a generator connected to an industrial frequency network. Both machines are simultaneously tested under load, and the energy consumption for testing is reduced owing to its recuperation. The method requires a correct loading algorithm. Simulation of the method based on chain models does not take into account the implementation features. Thus, it is worthwhile to refine the simulation of the asynchronous machine-testing system with the use of a mutual-loading method. The method is based on rigorous models taking into account the coupling of machine torque through a common shaft, the operation of machines powered by a frequency converter, a nonsinusoidal supplying voltage, the saturation of steel, and the current displacement in the conductors—e.g., based on a related analysis of electromagnetic fields in both machines. For refined simulation of the asynchronous machine-testing system with the use of the method of mutual loading, the authors have applied the Ansys Simplorer software package for the simulation of electromechanical units with electrical and mechanical ports, as well as an Ansys Maxwell software package for finite-element analysis of electromagnetic fields have been used. The experimental studies of the system have been carried out by means of laboratory-scale equipment using certified devices. A refined simulation technique for an energy-efficient testing system consisting of asynchronous machines using a method of mutual loading has been developed. It is based on calculation of the electromagnetic field and makes it possible to determine transient and steady-state operation modes for the case of a two-machine unit with a common shaft. An automated testing bench has been made that makes it possible to perform testing asynchronous machines using the method of mutual loading. The developed refined simulation technique for electromechanical processes occurring in asynchronous machines under testing by means of a mutual-loading method with the associated calculations of electromagnetic fields in both machines provides obtaining the calculation results having an error of less than 5–7% in comparison with a 40% error of calculations in the transient modes of operation using chain models. [ABSTRACT FROM AUTHOR] |
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