Stability-Oriented Minimum Switching/Sampling Frequency for Cyber-Physical Systems: Grid-Connected Inverters Under Weak Grid
نویسندگان
چکیده
Although the cyber-physical system stability is widely studied, scholars focus more on with communication time delay. Therein, grid-connected inverters digital control are regarded as one simplest and typical system. Meanwhile, switching/sampling frequency of inverter always selected low possible from an efficiency viewpoint, resulting in unavoidable delay time. This apt to cause instability, which prone severity under weak grid. To this end, paper provides a minimum for inverters. Firstly, impedance model equivalent constructed, based padé approximate approach. consists three parts, i.e., sampling cyber/physical level, calculation cyber level pulsewidth modulation physical reflects interaction impact. Furthermore, forbidden criterion applied make solving process become Hurwitz matrix identification problem through space mappings. Based these mappings, adaptive step search approach adopted obtain frequency. Finally, proposed can well evaluate different frequencies simulation experiment.
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ژورنال
عنوان ژورنال: IEEE Transactions on Circuits and Systems I-regular Papers
سال: 2022
ISSN: ['1549-8328', '1558-0806']
DOI: https://doi.org/10.1109/tcsi.2021.3113772