Evaluation of resonant damping techniques for Z-source current-type inverter

Loh, Poh Chiang , Gajanayake, Chandana Jayampathi, Vilathgamuwa, D. Mahinda, & Blaabjerg, Frede (2008) Evaluation of resonant damping techniques for Z-source current-type inverter. IEEE Transactions on Power Electronics, 23(4), pp. 2035-2043.

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For the renewable energy sources whose outputs vary continuously, a Z-source current-type inverter has been proposed as a possible buck-boost alternative for grid-interfacing. With a unique X-shaped LC network connected between its dc power source and inverter topology, Z-source current-type inverter is however expected to suffer from compounded resonant complications in addition to those associated with its second-order output filter. To improve its damping performance, this paper proposes the careful integration of Posicast or three-step compensators before the inverter pulse-width modulator for damping triggered resonant oscillations. In total, two compensators are needed for wave-shaping the inverter boost factor and modulation ratio, and they can conveniently be implemented using first-in first-out stacks and embedded timers of modern digital signal processors widely used in motion control applications. Both techniques are found to damp resonance of ac filter well, but for cases of transiting from current-buck to boost state, three-step technique is less effective due to the sudden intermediate discharging interval introduced by its non-monotonic stepping (unlike the monotonic stepping of Posicast damping). These findings have been confirmed both in simulations and experiments using an implemented laboratory prototype.

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18 citations in Web of Science®

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ID Code: 74234
Item Type: Journal Article
Refereed: Yes
Keywords: Buck-boost, current source inverters (CSIs), Posicast control, Pulsewidth modulation (PWM), Resonant damping, Z-source inverters
DOI: 10.1109/TPEL.2008.924590
ISSN: 1941-0107
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2008 IEEE
Deposited On: 22 Jul 2014 22:37
Last Modified: 24 Jul 2014 00:17

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