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A Unified Controller for Utility-Interactive Uninterruptible Power Converters for Grid Connected and Autonomous Operations

Shan, S and Umanand, Loganathan (2019) A Unified Controller for Utility-Interactive Uninterruptible Power Converters for Grid Connected and Autonomous Operations. In: IEEE TRANSACTIONS ON POWER ELECTRONICS, 34 (4). pp. 3871-3887.

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Official URL: https://dx.doi.org/10.1109/TPEL.2018.2853636

Abstract

This paper proposes a unified control based utility-interactive uninterruptible power converter (UIUPC). The proposed control enables the UIUPC to inherently transfer from a p - q control strategy in grid-connected mode to a voltage-frequency control strategy in autonomous mode and vice-versa. This happens seamlessly with the same control topology. The need to switch between two separate control architectures is thus eliminated. Critical islanding detection and synchronizing mechanisms are also not needed in the proposed control method. The unified controller proposed in this paper is derived from the concept of controlling the perturbations in the magnitude and speed of the point of common coupling (PCC) space vector. The PCC space vector is compared with a reference space vector applied in the direction of the PCC space vector on an instantaneous basis to extract the perturbations. The reference system of the proposed control is linked to the dynamics of the PCC space vector. This offers the ability of parallel operation of similar unified control UIUPC. Thus, in addition to the above said advantages, the proposed control also puts forth an alternative to paralleling approaches like conventional droop and master-slave configurations. The effectiveness of the proposed control is validated by simulation and experimentation.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords: Distributed generation; grid interactive control; grid synchronization; islanded operation; seamless transfer; unified control; utility-interactive uninterruptible power supply (UPS)
Department/Centre: Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Depositing User: Id for Latest eprints
Date Deposited: 24 May 2019 11:20
Last Modified: 24 May 2019 11:20
URI: http://eprints.iisc.ac.in/id/eprint/62461

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