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This paper discusses the problem of the Takagi-Sugeno (T-S) filter design form for a three level inverter drive system. A traditional filter always defines the noise in the infinite frequency domain, which results in low filtering accuracy. When the frequency of ranges of noises is known in advance, we can design the fuzzy filter in the finite-frequency domain where the fuzzy filter can estimate the rotor flux. The proposed fuzzy filter can get a better noise-attenuation performance. A three-level inverter drive system is designed and modulated by the space vector pulse width modulation (SVPWM) method. Noise sources with different frequencies are injected into the model to verify the effectiveness of the proposed method and then compared to simulations and experiment.

Fuzzy Filter Design in Finite-Frequency Domain for Three-Level Inverter Drive System