A novel fuzzy direct torque control system for three-level inverter-fed induction machine |
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Authors: | Shu-Xi Liu Ming-Yu Wang Yu-Guang Chen Shan Li |
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Affiliation: | [1]State Key Laboratory of Power Transmission Equipment % Systems Security and New Technology, Chongqing University, Chongqing 400044, PRC [2]School of Electronic Information and Automation, Chongqing University of Technology, Chongqing 400050, PRC |
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Abstract: | Diode clamped multi-level inverter (DCMLI) has a wide application prospect in high-voltage and adjustable speed drive systems due to its low stress on switching devices, low harmonic output, and simple structure. However, the problem of complexity of selecting vectors and capacitor voltage unbalance needs to be solved when the algorithm of direct torque control (DTC) is implemented on DCMLI. In this paper, a fuzzy DTC system of an induction machine fed by a three-level neutral-point-clamped (NPC) inverter is proposed. After introducing fuzzy logic, optimal selecting switching state is realized by applying various strategies which can distinguish the grade of the errors of stator flux linkage, torque, the neutral-point potential, and the position of stator flux linkage. Consequently, the neutral-point potential unbalance, the dv/dt of output voltage and the switching loss are restrained effectively, and desirable dynamic and steady-state performances of induction machines can be obtained for the DTC scheme. A design method of the fuzzy controller is introduced in detail, and the relevant simulation and experimental results have verified the feasibility of the proposed control algorithm. |
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Keywords: | Multi-level inverter direct torque control (DTC) fuzzy controller space voltage vector induction machine |
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