A variable frequency speed regulation system model was established that takes into account the dead zone effect of the frequency converter and the saturation of the magnetic circuit of the asynchronous motor. The stability of the variable frequency speed regulation system was analyzed by calculating the system eigenvalues, and it was determined that there are two potential stability problems in the entire speed regulation range: speed oscillation at low frequency and light load due to the dead zone effect of the variable frequency power supply and self-excited oscillation caused by the LC filter and the asynchronous motor parameters. In order to improve the stability of the system, the dead zone needs to be compensated. The experimental and simulation results confirm the existence of these two instability problems and the effectiveness of the established model.
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