Ali Ajami

Azarbaijan Shahid Madani University, Electrical Engineering Department, Faculty Member

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Damping of Power Oscillations Using Center Node Unified Power Flow Controller

A simple and low cost control strategy for shunt active filter and its implementation

Theoretical and experimental evaluation of SEPIC‐based DC–DC converters with two‐winding and three‐winding coupled inductors

International Journal of Circuit Theory and Applications, Jun 26, 2022

In this paper, an SEPIC‐based direct current–direct current (DC–DC) converter with high voltage g... more In this paper, an SEPIC‐based direct current–direct current (DC–DC) converter with high voltage gain and continuous input current is provided. Input current Continuity is a great advantage for renewable resources applications, and a small filter can be used in the output of these sources. Also in this paper, the effect of coupled inductor in three‐winding structure is discussed compared to the two‐winding coupled inductor. Precise analysis of converters based on two‐winding and three‐winding coupling inductors requires that the structures be similar so that the evaluation can be performed correctly. A comparison is performed between the two‐winding coupled inductor‐based converter and the improved converter to show the advantages of the proposed converter. All elements of the converter have been compared, and since both converters are different in terms of coupled inductor, complete analyses have been done in the field of calculating inductors. In addition to the features of the two‐winding coupled inductor converter, the proposed converter requires smaller coupled inductor to decrease the core size and increase the converter efficiency.

A Non-isolated Buck-Boost DC–DC Converter with Continuous Input Current and Wide Conversion Ratio Range for Photovoltaic Applications

2022 13th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC), Feb 1, 2022

High-power grinding mills are used in the cement and mining industries to crush clinker or copper... more High-power grinding mills are used in the cement and mining industries to crush clinker or copper ore and grind these materials to fine powder. The multimegawatt speed-controlled mill drives operate at a very low angular speed. Synchronous motors with a high number of pole pairs are used as the prime movers. They are traditionally fed by load-commutated thyristorized cycloconverters. These are prone to failure modes that can lead to excessive torque pulsations and high overcurrents. The huge stator, which was built as a separate ring-shaped structure around the tubular mill, may then get mechanically displaced, and the operation of the plant is interrupted. A novel and reliable direct drive uses a voltage source inverter that operates at the unity power factor for increased efficiency. Synchronous optimal pulsewidth modulation ensures a low harmonic current distortion and reduced switching losses at a very low switching frequency. The optimization of the pulse patterns takes the anisotropic magnetic properties of a separately excited synchronous motor into account. The implementation in a 23-MW semiautonomous grinding mill installed in a Zambian copper mine is intended.

Ali Ajami

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