Analysis of the aliasing effect caused in hardware-in-the-loop when reading PWM inputs of power converters
Entidad
UAM. Departamento de Tecnología Electrónica y de las ComunicacionesEditor
ElsevierFecha de edición
2021-11-19Cita
10.1016/j.ijepes.2021.107678
International Journal of Electrical Power & Energy Systems 136 (2021): 107678
ISSN
0142-0615DOI
10.1016/j.ijepes.2021.107678Versión del editor
https://doi.org/10.1016/j.ijepes.2021.107678Materias
Hardware-in-the-Loop; Harmonic analysis; Power Electronics; Real-Time Simulation; Signal sampling; Switching Converter; TelecomunicacionesDerechos
© 2021 The Author(s)Resumen
Hardware-in-the-loop (HIL) systems are commonly used to debug controllers in closed-loop operation. Therefore, the frequency response of the emulated subsystem is of special relevance. Undesirable oscillations can appear as a consequence of digitally sampling the switch control signals in power converter HIL models. These oscillations at relatively low frequencies, below the switching frequency, may confound the closed-loop operation and, therefore, the appropriate debugging of the controller. This paper shows that the lost information when an HIL model reads a PWM signal may create some output offset error or steady-state fluctuations, especially when the switching period and the sampling step get closer. The aliasing frequencies produced by the input sampling are calculated, and the small-signal analysis explains the relation between the output oscillation and the input PWM sub-harmonics. The output error spectrum proves that the main error sub-harmonics have the same aliasing frequency components. Both captured oscilloscope results obtained by an NI myRIO device and MATLAB simulations verify that significant distortions can be seen in the output inductor current if there is a low aliasing frequency in the digital version of the input PWM signal read by the HIL model
Lista de ficheros
Google Scholar:Zamiri Mamooliraftar, Elyas
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Sánchez González, Alberto
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Martínez García, María Sofía
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Castro Martín, Ángel de
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