Abstract
This paper deals with a newly conceived control topology based on the Repetitive action in 4-leg VSI for stand-alone Ground Power Unit (GPU) applications. In such mode of operation, a dedicated controller has to regulate the inverter output voltages, which are measured at the output of the power filter. The proposed Repetitive Control can provide the required harmonic compensation capabilities that are mandatory to comply with the Standards especially in the aircraft field, when balanced and unbalanced, linear and non-linear loads have to be fed at the fundamental frequency of 400Hz.
Highlights
The reduction of the harmonic content of current and voltage waveforms at the output of power electronic converters is of increasing interest for today's applications, with particular reference to either Distributed Generation Systems, Uninterruptible Power Supplies and Ground Power Units (GPUs), which have to comply with severe Standards
For the proposed GPU supply system, the inverter fourth leg is utilized to provide a neutral connection, and it is modulated without direct voltage regulation as suggested in [6]
Considering the 4-leg inverter is internally stable, a novel direct type repetitive control approach is proposed in this work for the output voltage regulation of the GPU system
Summary
The reduction of the harmonic content of current and voltage waveforms at the output of power electronic converters is of increasing interest for today's applications, with particular reference to either Distributed Generation Systems, Uninterruptible Power Supplies and Ground Power Units (GPUs), which have to comply with severe Standards. With reference to the control aspects, this paper deals with a Direct Repetitive controller devoted to the VSI output voltages regulation in GPUs. The proposed control strategy acts to fully exploit the benefit obtainable by the control structure when considering such a critical application. The proposed control strategy acts to fully exploit the benefit obtainable by the control structure when considering such a critical application It can provide the required harmonic compensation capabilities that are mandatory to comply with the Standards especially in the aircraft field, when balanced and unbalanced, linear and nonlinear loads have to be fed at the fundamental frequency of 400 Hz. A 40 kVA 3-phase 4-leg prototype converter is employed for experimental verification, while the control algorithm is implemented in a Artix FPGA using LabVIEW environment.
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