Journal ArticleDOI
Effect of voltage sags on adjustable-speed drives: a critical evaluation and an approach to improve performance
Reads0
Chats0
TLDR
In this paper, an integrated boost converter approach was proposed to provide ride-through to critical ASD load during voltage sags without any additional energy storage device. But, the performance of the boost converter was not evaluated.Abstract:
In this paper, a critical evaluation of the effect of voltage sags on adjustable-speed drives (ASDs) is presented. In particular, the DC-link voltage variation under voltage sag and its dependence on source impedance, DC-link inductance and output load is computed. It is shown that, for larger source impedance, the DC-link voltage variation under a voltage sag is also large and increases the susceptibility of an ASD and may result in a nuisance trip. The results from the analysis are plotted in per-unit quantities and serve as a design guide to assess ASD performance for a variety of sags. In order to improve the performance of ASDs, this paper proposes an integrated boost converter approach. This approach provides ride-through to critical ASD load during voltage sags without any additional energy storage device. Upon detection of a voltage sag, the boost converter operates with suitable duty ratio and maintains the DC-link voltage within acceptable limits. This prevents nuisance tripping and facilitates continuous operation of critical ASD load at rated torque. The proposed integrated boost converter does not introduce any additional semiconductors in the series path of the power flow and is low in cost. A commercially available 480 V 22 kVA ASD is modified with the integrated boost converter approach, and details are discussed. Analysis, simulation, and experimental performance of the ride-through approach are presented.read more
Citations
More filters
Journal ArticleDOI
Wind-turbine fault ride-through enhancement
TL;DR: In this paper, a nonlinear controller design for a power converter-based WTG that ensures that current levels remain within design limits, even at greatly reduced voltage levels, thus enhancing the WTG's fault ride-through capability.
Journal ArticleDOI
Recent advances in power electronics technology for industrial and traction machine drives
Thomas M. Jahns,Vladimir Blasko +1 more
TL;DR: Key development trends include the dominance of AC adjustable-speed drives in new applications, with the squirrel-cage induction machine as the preferred machine in most cases.
Proceedings ArticleDOI
An approach to achieve ride-through of an adjustable speed drive with flyback converter modules powered by super capacitors
TL;DR: In this paper, an approach to provide ride-through with flyback converter modules (FBCMs) powered by super capacitors is explored, and both unidirectional and bidirectional flyback DC/DC converter topologies are examined.
Journal ArticleDOI
Voltage Sags in Industrial Systems
TL;DR: In this paper, the effect of voltage sags in industrial systems on adjustable speed drives is investigated. But the authors focus on the effects of sags on the power system protections and in order to improve the susceptibility of the adjustable speed drive under sags.
Journal ArticleDOI
Analysis and design of a new voltage sag compensator for critical loads in electrical power distribution systems
TL;DR: In this article, a new voltage sag compensator for powering critical loads in electric distribution systems is discussed, which employs a pulsewidth modulation AC-AC converter (four insulated gate bipolar transistors per phase) along with an autotransformer.
References
More filters
Proceedings ArticleDOI
Characterization of voltage sags in industrial distribution systems
TL;DR: In this paper, the influence of the induction motor load on the characterization of voltage sags has been analyzed in industrial distribution systems. But the authors focused only on the positive-and negative-sequence voltages of the inductive motor.
Journal ArticleDOI
A voltage sag study in an industry with adjustable speed drives
H.G. Sarmiento,E. Estrada +1 more
TL;DR: In this paper, voltage sag measurements and their analysis were performed in two industries for a period of 17 months, and it was shown that adjustable speed drives (ASDs) are more sensitive to voltage sags than data processing equipment.
Proceedings ArticleDOI
Voltage sag ride-through for adjustable speed drives with active rectifiers
TL;DR: In this paper, a methodology for incorporating voltage sag ride-through in the design of ASDs with active rectifiers is presented, where the magnitude of the voltage sag for which ridethrough can be provided is determined by the current rating of the active rectifier and load condition of the ASD, but a sag of any duration can be compensated for.
Journal ArticleDOI
Power quality and factory automation
TL;DR: In this article, a case study involving monitoring power quality disturbances at a representative plant and identifying the disturbances that disrupt production is described, where the sensitivities of representative electronic control equipment to the identified disturbances were measured and then projected to form a plant disturbance threshold.
Related Papers (5)
Analysis of voltage tolerance of AC adjustable-speed drives for three-phase balanced and unbalanced sags
Math Bollen,L.D. Zhang +1 more