Título:
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Generalized PWM-based method for multiphase neutral-point-clamped converters with capacitor voltage balance capability
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Autor/a:
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López, Iraide; Ceballos Recio, Salvador; Pou, Josep; Zaragoza Bertomeu, Jordi; Andreu, Jon; Ibarra Basabe, Edorta; Konstantinou, Georgios
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Otros autores:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. TIEG-P - Terrassa Industrial Electronics Group -Power |
Abstract:
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This paper presents a generalized pulse width modulation (PWM)-based control algorithm for multiphase neutral-point-clamped (NPC) converters. The proposed algorithm provides a zero sequence to be added to the reference voltages that contributes to improve the performance of the converter by: 1) Regulating the neutral-point (NP) current to eliminate/attenuate the low-frequency NP voltage ripples; 2) reducing the switching losses of the power semiconductors; and 3) maximizing the range of modulation indices for linear operation mode. The control method is formulated following a carrier-based PWM approach. Hence, dealing with complex space-vector diagrams to solve the modulation problem for multiphase converters is avoided. The recursive approach means that it can be easily extended to n-phase converters without increasing the complexity and computational burden, making it especially attractive for digital implementation. The proposed method allows regulating the NP voltage without the need for external controllers; therefore, no parameter tuning is required. The algorithm has been tested in a four-leg NPC converter prototype performing as a three- and four-phase system and operating with balanced and unbalanced loads. |
Abstract:
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Peer Reviewed |
Materia(s):
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-Switching circuits -Modulation (Electronics) -Electric current converters -Power semiconductors -neutral-point-clamped (NPC) converter -Carrier-based pulse-width modulation -capacitor voltage balance -multiphase multilevel converter -Circuits de commutació -Modulació (Electrònica) -Convertidors de corrent elèctric -Semiconductors de potència |
Derechos:
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Tipo de documento:
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Artículo - Versión presentada Artículo |
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