Robust Model-Following control of a three-level Neutral Point Clamped shunt active filter in the medium voltage range |
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| Authors: | Alejandro Munduate Emilio Figueres Gabriel Garcera |
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| Affiliation: | 1. BANTEC GROUP, Portuetxe 14, 2, 3. 20018 Donostia, Spain;2. Universidad Politécnica de Valencia, Departamento de Ingeniería Electrónica, Edificio 7F, Camino de Vera S/N, 46022 Valencia, Spain;1. Computer Science, University of Texas at El Paso, 500 West University Avenue, El Paso, TX 79968, USA;2. Departament de Sistemes Informatics i Computacio, Universitat Politecnica de Valencia, Cami de Vera s/n, 46020 Valencia, Spain;1. Sección de Laboratorio, Hospital Marina Baixa, Villajoyosa, Alicante, España;2. Sección de Reumatología¸ Hospital Marina Baixa, Villajoyosa, Alicante, España;3. Servicio de Reumatología, Hospital Universitario Gregorio Marañón, Madrid, España;4. CIO-Universidad Miguel Hernández, Elche, Alicante, España;1. Department of Computer Engineering, Universitat Politècnica de València, Camí de Vera s/n, Valencia 46022, Spain;2. Department of Electrical and Computer Engineering, Northeastern University, 360 Huntington Ave., Boston, MA 02115, USA;1. Instituto de Tecnología Cerámica (ITC), Universitat Jaume I, Castellón, E-12006 Castellón, Spain;2. Instituto de Cerámica y Vidrio (ICV), CSIC, E-28049 Madrid, Spain;3. Instituto de Tecnología de Materiales (ITM), Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain |
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| Abstract: | This paper presents a robust control technique applied to a three-phase shunt active filter based on an NPC inverter, showing the modelling procedure needed to carry out the proposed control. The transfer functions for the control of the currents injected by the active filter are derived. The modelling is based on the abc/dq Park transformation of the AC system variables. The currents injected by the active filter are controlled in the synchronous orthogonal dq reference frame. The proposed robust current control technique is compared to a conventional PI controller in the dq frame, and to a PIS controller in the dq frame, consisting of a PI and resonant controllers synchronized to the frequencies of the nonlinear load current harmonics. On one hand, it is shown that the proposed technique improves the current harmonics compensation obtained by conventional PI control. On the other hand, it is found that the PIS controller is the best suited for current harmonics compensation among the controllers under study. Nevertheless, the RMF controller results in a simpler implementation than the PIS controller. Moreover, the proposed robust control has been applied to the DC-link voltage regulation, and it has been compared to a PI controller. It is shown that the robust control technique improves the dynamic response of the inverter to load steps without the need of a high crossover frequency of the DC-link voltage loop. |
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