SRF theory revisited to control self-supported dynamic voltage restorer (DVR) for unbalanced and nonlinear loads

Kanjiya, Parag ; Singh, Bhim ; Chandra, Ambrish ; Al-Haddad, Kamal (2013) SRF theory revisited to control self-supported dynamic voltage restorer (DVR) for unbalanced and nonlinear loads IEEE Transactions on Industry Applications, 49 (5). pp. 2330-2340. ISSN 0093-9994

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Official URL: http://ieeexplore.ieee.org/document/6512618/

Related URL: http://dx.doi.org/10.1109/TIA.2013.2261273

Abstract

The protection of the sensitive unbalanced nonlinear loads from sag/swell, distortion, and unbalance in supply voltage is achieved economically using the dynamic voltage restorer (DVR). A simple generalized algorithm based on basic synchronous-reference-frame theory has been developed for the generation of instantaneous reference compensating voltages for controlling a DVR. This novel algorithm makes use of the fundamental positive-sequence phase voltages extracted by sensing only two unbalanced and/or distorted line voltages. The algorithm is general enough to handle linear as well as nonlinear loads. The compensating voltages when injected in series with a distribution feeder by three single-phase H-bridge voltage-source converters with a constant switching frequency hysteresis band voltage controller tightly regulate the voltage at the load terminals against any power quality problems on the source side. A capacitor-supported DVR does not need any active power during steady-state operation because the injected voltage is in quadrature with the feeder current. The proposed control strategy is validated through extensive simulation and real-time experimental studies.

Item Type:Article
Source:Copyright of this article belongs to Institute of Electrical and Electronics Engineers.
Keywords:Voltage-Source Converter (VSC); Dynamic Voltage Restorer (DVR); Hysteresis Band Controller; Nonlinear Load
ID Code:106267
Deposited On:07 Aug 2017 12:32
Last Modified:07 Aug 2017 12:32

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