Adjustable inertial response from the converter with adaptive droop control in DC grids

Wang, Yi and Wang, Chen and Xu, Lie and Meng, Jianhui and Hei, Yang (2018) Adjustable inertial response from the converter with adaptive droop control in DC grids. IEEE Transactions on Smart Grid. ISSN 1949-3053 (https://doi.org/10.1109/TSG.2018.2820160)

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Abstract

In a DC grid, the inherent inertial support from the DC capacitors is too small to resist step changes or random fluctuations from the intermittent power resources, which results in lower DC voltage quality. In this paper, an adaptive droop control (ADC) strategy is proposed to achieve an increased inertia from the droop controlled converter. The adaptable droop coefficient according to the DC voltage variation enables fast swing of the droop curve, so that the converter can provide inertial power for the DC grid like synchronous generators in AC grids. The design of the ADC including the calculation and limitation of the adaptable droop coefficient is analyzed in detail. The small-signal analysis of the DC grid with ADC is provided to identify its stability issue. Experimental tests on a controller hardware-in-the-loop (HIL) platform of a low-voltage (LV) DC grid are carried out to validate the proposed method. In this LV DC grid, the proposed ADC is implemented on the energy storage system (ESS) which provides inertial support to improve the DC voltage quality under different power fluctuations, and smooths the power transmitted to AC grid.

  • Item type:Article
    ID code:63567
    Dates:
    Date
    Event
    28 March 2018
    Published
    28 March 2018
    Published Online
    18 March 2018
    Accepted
    Notes:(c) 2018 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:03 Apr 2018 10:30
    Last modified:26 Apr 2024 04:07
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/63567
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