A Novel Feedforward Stabilizing Technique to Damp Power Oscillations Caused by DC–DC Converters Fed From a DC Bus

Hussain, Mosaddique Nawaz ; Agarwal, Vivek (2020) A Novel Feedforward Stabilizing Technique to Damp Power Oscillations Caused by DC–DC Converters Fed From a DC Bus IEEE Journal of Emerging and Selected Topics in Power Electronics, 8 (2). pp. 1528-1535. ISSN 2168-6777

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Official URL: http://doi.org/10.1109/JESTPE.2019.2898354

Related URL: http://dx.doi.org/10.1109/JESTPE.2019.2898354

Abstract

Switched-mode power electronic converters with feedback control tend to behave like Constant Power Loads (CPLs). When a CPL interacts with a poorly damped input LC filter, it amplifies any disturbance that occurs in the LC circuit, and the system becomes prone to instability. If the CPL is emulated as a positive resistance during any disturbance by manipulating the power that it consumes instantaneously, then the instability can be avoided. In this paper, this has been achieved by a feedforward technique, in which the power consumed by the CPL is made to follow the trajectory of the input voltage during any disturbance similar to the power consumed by a resistive load. The proposed feedforward technique has only one variable that can be determined by the input filter parameters and is independent of the type of the CPL. A case of a dc-dc converter-based CPL is studied in this paper, and the proposed technique is shown to create a virtual RC impedance at the input of the CPL to offset the negative resistance behavior. The effectiveness of the proposed technique is showcased through the detailed simulations and experimental studies on a 100-W CPL prototype.

Item Type:Article
Source:Copyright of this article belongs to Institute of Electrical and Electronics Engineers.
Keywords:Active Damping; Constant Power Loads (CPLs); DC Microgrid Stability; Virtual Impedance.
ID Code:115018
Deposited On:16 Mar 2021 09:00
Last Modified:16 Mar 2021 09:00

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