NDLI: Effects of load variation on a weak grid under unbalanced voltage conditions

Content Provider	IEEE Xplore Digital Library
Author	Khan, A. Khan, M.A. Barendse, P.S.
Copyright Year	2014
Description	Author affiliation: Dept. of Electr. Eng., Univ. of Cape Town, Cape Town, South Africa (Khan, A.; Khan, M.A.; Barendse, P.S.)
Abstract	This paper presents the basic principle of a laboratory based weak grid emulator in order to describe the effects of load variation at the point of common coupling (PCC). The impact of these effects is significant and for that a voltage regulation feature has been added to maintain the voltage at the load connection. Design and performance are investigated by introducing unbalanced voltage conditions to test the system's behavior. In case of unbalance, power is injected from the DC link to regulate the voltage at the converter output connected to either passive or an active load. The system has a rating of 1 kW and can handle an output voltage of 50-150% of the nominal voltage peak. A space vector voltage oriented control (VOC) technique is implemented on the converters and the PI controller gains are tuned accordingly. National Instruments (NI) PXI controller is used for the hardware implementation. Voltage unbalance is generated and controlled with the help of dual vector sequence extraction technique.
Sponsorship	IEEE
Starting Page	1711
Ending Page	1716
File Size	2809438
Page Count	6
File Format	PDF
ISBN	9781479943890
DOI	10.1109/ICELMACH.2014.6960413
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-09-02
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Thyristors Voltage fluctuations Dual Vector Power system stability Voltage control Voltage Oriented Control Unbalanced Voltage Conditions Load Variation Stability criteria Point of Common Coupling Load management National Instruments PXI Impedance
Content Type	Text
Resource Type	Article

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