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218 results on '"Vaez-Zadeh, Sadegh"'

8. Low-Complexity Model-Free Combined Control of Grid-Connected Converters Under Normal and Abnormal Grid Conditions

Author

Jabbarnejad, Alireza, Vaez-Zadeh, Sadegh, Jamallo, Pooriya, and Rodriguez, Jose

Abstract

This article proposes a low-complexity model-free control method for grid-connected converters. It controls the grid current vector under normal and abnormal grid conditions through hysteresis controllers with a novel dynamic switching logic without any current/voltage reference frame transformation and sequence extraction. In addition, the proposed method has overcurrent protection, including under fault conditions due to a direct current magnitude regulation. Compared to the existing combined control method, it is model-free, enjoys current limiting and stable operation under fault conditions and power factor control mode, and lacks any estimation procedure. Compared to the predictive control method, it encounters a lower computation burden and is robust to the system model parameters. The performance effectiveness and superiority of the system under the proposed control and existing methods in terms of stability and robustness are shown by extensive analytical, simulation, and experimental studies.

Published
2023
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49. Efficiency optimization control of single-phase induction motor drives

Author

Zahedi, Bijan and Vaez-Zadeh, Sadegh

Subjects
Induction electric motors -- Design and construction, Mathematical optimization -- Research, Energy management systems -- Methods, Electric driving -- Design and construction, Business, Electronics, Electronics and electrical industries
Abstract

The recent rising of oil prices and global warming crises increasingly support the ongoing practice of loss minimization control of electric motors including single-phase induction ones as the most used motors. Therefore, the tendency toward using variable-speed drives (VSDs) to save energy by adjusting motor speed is seen, but on account of increasing motor loss in nonrated conditions, an efficiency control system can improve energy saving even more. In this paper, after carrying out a detailed motor efficiency analysis, an appropriate method for motor efficiency maximization control, combined with a VSD, is presented and implemented. Experimental results of the implemented system validate the proposed method. Index Terms--Efficiency optimization, energy saving, motor drives, single-phase induction motors (SPIMs), speed control.

Published
2009

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