TRANSFER OF AN ASYNCHRONOUS ELECTRIC MOTOR TO GENERATOR FOR PARALLEL OPERATION WITH MICROGRID

Abstract

One of the issues of the energy sector is to increase the efficiency of energy supply to remote or isolated territories by creating microgrids based on renewable energy sources. The requirements for generators are design simplicity and high operational reliability, as well as the parameters of the generated electricity. (Research purpose) The research purpose is converting an asynchronous motor into an asynchronous generator. The technical solution for the transfer of an asynchronous electric motor to the generator has two directions: the creation of reactive energy in the electric motor and the excitation control. We took the first direction as a basis. (Materials and methods) The article presents a semi-automatic synchronization scheme for the operation of an asynchronous electric motor in generator mode, when one part of the operations is performed automatically and the other is performed manually. A test stand was made. The characteristics of an asynchronous generator when working in parallel with the grid are presented. (Results and discussion) During the analysis of the data obtained, the dependence of the power transmitted by the generator to the grid on the rotating frequency of the asynchronous electric motor was drawn. Using experimental studies, capacitor banks included in the stator winding of an asynchronous motor according to the «triangle» scheme allow it to be used as an asynchronous generator. (Conclusions) The parameters of the asynchronous generator depend on the rotation speed and the power transmitted by the micro-gas turbine engine; the semi-automatic synchronization scheme, in which one part of the operations is carried out automatically and the other manually, makes it possible to turn on the asynchronous generator to work with the distribution grid without equalizing current.