Computer Simulation on the Basis of SIMINTECH Asynchronous Wind Generator

A wide application of asynchronous generators in wind generators is limited by the complexity of the voltage control and stabilizing. At significant frequency fluctuations, an asynchronous generator does not provide consistent excitation. Different approaches to the comprehension of self-excitation theoretical definition do not allow giving unambiguous recommendations, based on physical processes simulation, to provide the reliable excitation for an asynchronous generator. The general theory of consistent self-excitation in an asynchronous generator is the intersection of two characteristics: a straight one - a capacitor and a magnetization curve of a wind generator. When simulating self-excitation in SimInTech, it is demonstrated that stable excitation occurs with a straight characteristic of an asynchronous wind generator. The article provides a theoretical rationale for this phenomenon, based on the equation generation, according to a simplified equivalent circuit for one AG phase taking into account the equality of conductivities for the occurrence of resonance with undamped oscillations. The obtained simulation model of an asynchronous wind generator made in SimInTech clearly shows the operation of an electric machine where reliable self-excitation requires the following: the presence of remanence, the connection of capacitors with a certain capacity to the generator outputs and the rotor rotation at a certain speed. The adequacy of the simulation model was verified by live tests of an asynchronous generator conducted on a specialized stand with an active load connected.