Lai, Jinmu, Yin, Xianggen, Yin, Xin, Ullah, Zia, Jiang, Lin 
ORCID: 0000-0001-6531-2791 and Wang, Zhen
(2021)
Improved Comprehensive Control of Modular Multilevel Converter under ACDC Grid Faults and Harmonic Operation Conditions.
IEEE TRANSACTIONS ON POWER ELECTRONICS, 36 (6).
pp. 6537-6556.
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20201123 Improved Comprehensive Control of Modular Multilevel Converter under ACDC faults and harmonic operation conditions.pdf - Author Accepted Manuscript Download (3MB) | Preview |
Abstract
Recent applications of modular multilevel converter (MMC) have posed various problems such as ac/dc grid faults, asymmetric operation conditions, ac grid voltage excessive harmonics, and ac circulating currents, which deteriorate the system's performance and also threaten the safe operation. In this article, an improved comprehensive control architecture of MMC is proposed to maintain a stable voltage control, eliminate harmonics in ac-side and circulating currents, and dc-bus voltage ripple under ac/dc grid faults and harmonic operation conditions. The proposed comprehensive control consists of improved hierarchical voltage control and repetitive controller-based arm current control. The improved hierarchical voltage control, including a novel negative-sequence current injection and dc-circulating current injection-based leg-averaging control and their seamlessly switching handling, enables the MMC to operate under various operating conditions, thereby producing the arm current reference for inner-loop control. The proposed repetitive controller-based arm current control can recognize the control of multifrequency components of arm current without separating positive-, negative- and zero-sequence current components of ac-side currents and circulating currents. Finally, the simulation and experimental studies of the three-phase MMC were carried out in detail, and the findings demonstrate the efficiency and merits of the proposed control method.
| Item Type: | Article |
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| Uncontrolled Keywords: | Voltage control, Current control, Harmonic analysis, Capacitors, Multilevel converters, Circuit faults, Power system harmonics, Arm current control, comprehensive control, hierarchical voltage control, modular multilevel converter, repetitive controller |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 24 Nov 2020 08:31 |
| Last Modified: | 15 Mar 2024 04:53 |
| DOI: | 10.1109/TPEL.2020.3040297 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3107996 |
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