A New Backward Euler Stabilized Optimum Controller for NPC Back-to-Back Five Level Converters

Miguel Chaves, José Fernando Silva, Sónia Ferreira Pinto, Elmano Margato and João Santana
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Miguel Chaves: Instituto Superior de Engenharia de Lisboa (ISEL), Instituto Politécnico de Lisboa, Rua Conselheiro Emídio Navarro 1, Lisboa 1959-007, Portugal
José Fernando Silva: Departamento de Engenharia Eletrotécnica e de Computadores, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais 1, Lisboa 1049-001, Portugal
Sónia Ferreira Pinto: Departamento de Engenharia Eletrotécnica e de Computadores, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais 1, Lisboa 1049-001, Portugal
Elmano Margato: Instituto Superior de Engenharia de Lisboa (ISEL), Instituto Politécnico de Lisboa, Rua Conselheiro Emídio Navarro 1, Lisboa 1959-007, Portugal
João Santana: Departamento de Engenharia Eletrotécnica e de Computadores, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais 1, Lisboa 1049-001, Portugal

Energies, 2017, vol. 10, issue 6, 1-16

Abstract: This paper presents a backward Euler stabilized-based control strategy applied to a neutral point clamped (NPC) back-to-back connected five level converters. A generalized method is used to obtain the back-to-back NPC converter system model. The backward Euler stabilized-based control strategy uses one set of calculations to compute the optimum voltage vector needed to reach the references and to balance the voltage of the DC-bus capacitors. The output voltage vector is selected using a modified cost functional that includes variable tracking errors in the functional weights, whereas in classic approaches, the weights are considered constant. The proposed modified cost functional enables AC current tracking and DC-bus voltage balancing in a wide range of operating conditions. The paper main contributions are: (i) a backward Euler stabilized-based control strategy applied to a double, back-to-back connected, five level NPC converter; (ii) the use of cost functional weight varying as a function of the controlled variable tracking errors to enforce the controlled variables and to balance the DC capacitor voltages; and (iii) the demonstration of system feasibility for this type of converter topology and control strategy, ensuring a high enough computational efficiency and extending the modulation index from 0.6 to 0.93. Experimental results are presented using a prototype of a five level NPC back-to-back converter.

Keywords: multilevel converters; back-to-back converters; backward Euler based control; capacitors voltage balancing (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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