Three-phase AC side voltage-doubling high power density voltage source converter with intrinsic buck-boost cell and common mode voltage suppression

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Li, Peng and Adam, Grain Philip and Hu, Yihua and Holliday, Derrick and Williams, Barry (2014) Three-phase AC side voltage-doubling high power density voltage source converter with intrinsic buck-boost cell and common mode voltage suppression. IEEE Transactions on Power Electronics. ISSN 0885-8993 (https://doi.org/10.1109/TPEL.2014.2366377)

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Abstract

The three-phase two-level voltage source converter (VSC) is widely employed in power conversions between AC and DC for its four-quadrant operation and control flexibility. However, it suffers from the low output voltage range with a peak value of half DC-link per phase, which necessitates the use of either high DC-link voltage or bulky step-up transformer to enable the medium voltage operation. Additionally, the high common mode (CM) voltage between AC loads neutral points and ground may reduce the service life and reliability of electric machinery. In this paper, a three-phase AC side voltage-doubling VSC topology with intrinsic Buck-Boost cell is analyzed. By this configuration, the AC side voltage is doubled with the phase peak value equal to DC-link. That is, only half of the DC side capacitor bank is needed to generate the same output voltage. The proposed converter uses its buck-boost cell as a virtual voltage source to synthesize negative half of the output voltage by modulating its output AC phase voltage around the negative bus (which is the real zero when grounded). This permits the average CM voltage to be suppressed to zero, and loads connected to converter AC side not to withstand any DC voltage stress (reducing the insulation requirement). Modeling and control design for both rectifier and inverter modes of this converter in synchronous reference frame have been investigated to ensure a four-quadrant three-phase back-to-back system. Experimental results have verified the feasibility and the effectiveness of the proposed configuration and the designed control strategies.

ORCID iDs

Li, Peng ORCID logoORCID: https://orcid.org/0000-0003-3865-2998, Adam, Grain Philip ORCID logoORCID: https://orcid.org/0000-0002-1263-9771, Hu, Yihua, Holliday, Derrick ORCID logoORCID: https://orcid.org/0000-0002-6561-4535 and Williams, Barry;
  • Item type:Article
    ID code:50360
    Dates:
    Date
    Event
    17 December 2014
    Published
    30 October 2014
    Published Online
    24 October 2014
    Accepted
    Notes:(c) 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:14 Nov 2014 15:46
    Last modified:11 Nov 2024 10:52
    URI:https://strathprints.strath.ac.uk/id/eprint/50360
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