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Your search keyword '"Mirzaeva, Galina"' showing total 130 results
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130 results on '"Mirzaeva, Galina"'

34. The Use of Power Line Communication in Standalone Microgrids.

Author

Miller, Dmitry, Mirzaeva, Galina, Townsend, Christopher D., and Goodwin, Graham C.

Subjects
*CARRIER transmission on electric lines, *MICROGRIDS, *EMERGENCY power supply, *FREQUENCY shift keying, *ELECTRIC lines
Abstract

Standalone microgrids are used in various industrial operations to supply critical loads. The authors have proposed a stable and robust decentralized ac microgrid architecture that provides an automatic and equitable load sharing between distributed generators, without the use of droop control. To deal with faults or real-time changes in the distributed generation levels, a flexible reconfiguration of the microgrid can be advantageous. To achieve that, this article proposes the use of power line communication (PLC). Two PLC strategies are explored in this article: the first is based on using a single and constant PLC frequency, and the second is based on using a variable PLC frequency within a given range. This article details PLC injection, detection, and suppression methods, as well as the overall communication logic. It demonstrates the ability of the microgrid to adapt to changes while minimizing the amount of battery support. Findings of this article are supported by simulations and validated by experiments. [ABSTRACT FROM AUTHOR]

Published
2021
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43. Identifying Circulating Currents and Zero-Sequence Voltages for Reduction in Stored Capacitor Energy in Modular Multilevel Converters.

Author

Townsend, Christopher D., Goodwin, Graham Clifford, Konstantinou, Georgios, Petranovic, Nikola, Mirzaeva, Galina, Farivar, Ghias, and Pou, Josep

Subjects
CAPACITORS, ELECTRIC power conversion, ENERGY storage, TIME-domain analysis, HARMONIC analysis (Mathematics), ELECTRIC potential
Abstract

To reduce stored capacitor energy in modular multilevel converters (MMCs), previous papers propose injection of harmonics in the arm circulating currents and zero-sequence voltages. While this approach is effective, previously utilized combinations of injected harmonics significantly increase converter current ratings. In contrast, the optimization approach developed in this article identifies harmonics that simultaneously achieve capacitor energy optimization and reduced overrating of converter currents. In addition, the proposed approach eliminates the possibility of convergence to local minima, which is a significant improvement on previously proposed nonconvex optimization approaches. Experimental verification of the proposed approach is performed on a low-voltage three-phase modular multilevel converter. [ABSTRACT FROM AUTHOR]

Published
2021
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44. Common Mode Voltage Elimination in Variable Speed Drives for Improved Electrical Safety.

Author

Mirzaeva, Galina, Carter, Douglas, Uddin, S M Muslem, and Stepien, Peter

Subjects
*VARIABLE speed drives, *FAULT currents, *ELECTROMAGNETIC interference, *GEOLOGIC faults, *ELECTRICITY safety, *ELECTRIC potential, *HARMONIC drives
Abstract

Common-mode-voltage (CMV) is a well-known source of bearing currents and electromagnetic interference (EMI) in industrial applications. In industrial environments with impedance-earthed IT earthing system, such as underground mining, CMV is additionally associated with potentially undetectable fault currents, due to their diversion away from a protection circuit. This article proposes a variable speed drive (VSD) solution that generates practically zero CMV and removes alternative paths for the fault currents. The VSD topology utilized in this article is a standard two-level inverter with active front end. The article develops a control strategy such that it eliminates CMV, minimizes EMI, and optimizes harmonic distortion at the drive input and output. Experiments conducted in physically emulated industrial environment have confirmed that CMV and EMI are practically eliminated, and the earth fault protection is effective. [ABSTRACT FROM AUTHOR]

Published
2020
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