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Active power filters (APF) can compensate for harmonics and reactive power. The traditional APF PI control has difficulty in parameter setting, and has the characteristics of control lag, and the control accuracy of current is low. The control of three-level APF needs to consider multiple objectives. Finite Control Set Model Predictive Control (FCS-MPC) is a newly proposed method that can increase constraints and multi-objective control. According to the limited switching state, it tracks the reference current and has dynamic Fast response and good compensation results. In this paper, the finite set model predictive control algorithm of three-level APF is studied, and the results show that the harmonic content of the power grid is low, which meets the relevant requirements.

Abstract-The electromagnetic noise of motor is mainly caused by the main magnetic fluxing into the air gap along the radial direction, generating radial force in the tooth of stator and rotor, which causes electromagnetic vibration and noise. The paper analyzes the theory of the production principle of electromagnetic force by selecting different slot combination to verify the influence on the electromagnetic wave, further conducts through the finite element analysis and modal analysis to prove the validity of the theory, and finally to prove that the choice of slot combination has an important influence on the noise of squirrel cage induction motor through noise test tank.