Analysis of Errors in a High Accuracy Sampled-Data Stabilising System Operating with a Wide Range of PWM

  • This paper presents a new method of analysing the error of a sampled-data velocity stabilising system with a wide range of pulse width modulation. The analysis is based on multi-channel model obtained as a result of approximation of pulse-modulated signal at the output of a PWM converter. Approximation of piecewise-linear modulation characteristics of each channel has been obtained as a series expansion of Hermite polynomials where the expansion comprises two polynomials of the first and third orders. The transfer function of every channel and a closed-loop system has been obtained using multidimensional Z-transform. The analytical expression of an error under impact of a step input has been derived using a transfer function of the closed-loop system. A dc electric drive has been used as an example of high accuracy sample-data stabilising system to verify and demonstrate the proposed method.

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Metadaten
Document Type:Conference Object
Language:English
Parent Title (English):Boje, Xia (Eds.): Proceedings of the 19th IFAC World Congress 2014, Cape Town, South Africa, Aug. 24-29, 2014
First Page:9241
Last Page:9246
ISBN:978-3-902823-62-5
DOI:https://doi.org/10.3182/20140824-6-ZA-1003.00743
Publisher:Elsevier
Publication year:2014
Tag:Identification and control methods; Modeling; Motion Control Systems
Departments, institutes and facilities:Fachbereich Elektrotechnik, Maschinenbau, Technikjournalismus
Institut für Technik, Ressourcenschonung und Energieeffizienz (TREE)
Dewey Decimal Classification (DDC):6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Entry in this database:2016/04/30