Analysis of the aliasing effect caused in hardware-in-the-loop when reading PWM inputs of power converters
| Autor: | Elyas Zamiri, Alberto Sanchez, Angel de Castro, María Sofía Martínez-García |
|---|---|
| Přispěvatelé: | UAM. Departamento de Tecnología Electrónica y de las Comunicaciones |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Frequency response
Hardware-in-the-Loop Switching Converter Telecomunicaciones Computer science Hardware-in-the-loop simulation Energy Engineering and Power Technology Real-Time Simulation Signal Harmonic analysis Sampling (signal processing) Control theory Aliasing Electrical and Electronic Engineering Oscilloscope Power Electronics Signal sampling Pulse-width modulation |
| Zdroj: | Biblos-e Archivo. Repositorio Institucional de la UAM instname |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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