Small-signal converter admittance in the pn-frame : systematic derivation and analysis of the cross-coupling terms

Amico, Gabriele and Egea Àlvarez, Agustí and Brogan, Paul and Zhang, Shuo (2019) Small-signal converter admittance in the pn-frame : systematic derivation and analysis of the cross-coupling terms. IEEE Transactions on Energy Conversion, 34 (4). pp. 1829-1838. ISSN 0885-8969 (https://doi.org/10.1109/TEC.2019.2924922)

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Abstract

A methodology is presented to derive the small-signal admittance of a converter based control system in the pn-frame. Such a methodology makes use of a set of derived equations which link the qd-frame small-signal admittance data to the corresponding pn-frame small-signal admittance terms. Compared to existing results providing the pn-frame small-signal impedance of a grid connected converter, the presented technique allows a calculation of the pn-frame small-signal admittance (or impedance) when additional elements are present in the controller, as in many practical designs. The presented technique is therefore generic and provides a systematic way to calculate the pn-frame admittance regardless of the used converter control scheme. In the study, the method has been applied to assess how different parts of the controller affect the pn-frame admittance terms and, in particular, the cross-coupling which exists between its positive and negative sequence terms. Thereby, the results of the proposed methodology have been used to study the impact of the negative sequence current compensator on the stability performance of a grid-connected converter. Experimental tests using a real hardware set up are used to support the obtained results.

  • Item type:Article
    ID code:68725
    Dates:
    Date
    Event
    31 December 2019
    Published
    28 June 2019
    Published Online
    15 June 2019
    Accepted
    Notes:© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, 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 component 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:04 Jul 2019 10:13
    Last modified:16 Apr 2024 02:10
    URI:https://strathprints.strath.ac.uk/id/eprint/68725
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