Papers by Abdelrahman Farghly
The modular multilevel converters (MMC) utilization has brought about a transformative impact on ... more The modular multilevel converters (MMC) utilization has brought about a transformative impact on high voltage direct current (HVDC)
DC power distribution has recently been the foremost trend to gather the rapid rising of energy d... more DC power distribution has recently been the foremost trend to gather the rapid rising of energy demand and, instantaneously, to challenge environmental issues coming from non-renewable energy sources. Therefore, Renewable Energy Sources (RES) are employed in DC grids to guarantee consistent and reasonable energy intended for the industrial applications of upcoming mobile power systems, such as electric aircraft and ships. Shipboard Power Systems (SPS) with DC capability has been proposed as a promising solution for stringent regulations on ships because of their major profits in fuel savings with variable speed drives and simple utilization of Energy Storage Systems (ESS). In this paper, an electric ship is proposed as a case study based on Solid-State Transformer (SST) in addition to Multi-Modular Converter (MMC) to meet the large-scale power system requirements. A decouple control of Input-Series Output-Parallel (ISOP) SST is proposed with the control of the front-end MMC converter. The overall system is implemented and experimented based on Control-Hardware-in-the-Loop (CHiL) platform to confirm the performance and discuss the results.
International Middle East Power Systems Conference, 2022
LCC (Line Commutated Converter) in HVDC (High Voltage Direct current) systems inject current harm... more LCC (Line Commutated Converter) in HVDC (High Voltage Direct current) systems inject current harmonics in both DC transmission side and AC grids. Therefore, several techniques based on either passive and active filter have been proposed and applied to minimize the effect of these harmonics. This paper designs an SAPF (Shunt Active Power Filter) to compensate for the harmonics of an LCC converter. The control method was utilized based on SRF (Synchronous Reference Frame) theory to calculate reference currents based on dq transformation. This filter is used in a hybrid system consisting of a Twelve-pulse LCC and an MMC (Modular Multi Converter) (300 kV) HVDC system for reactive power reduction and harmonic current control compensation concurrently. A Control-Hardware-in-the-Loop (CHiL) platform is utilized to verify the validity of the proposed system.
Renewable energy sources (RESs) need power-electronics-based converters to deliver the acquired p... more Renewable energy sources (RESs) need power-electronics-based converters to deliver the acquired power to the grid. Those converters should provide voltage-bucking/boosting capabilities to accommodate various grid modes specially for three-phase distorted commonly unbalanced distribution utility networks. Several power electronic-based converters have been elaborated to fulfill this high-demand market. Single-stage converters are the most dominant in the market where the current source inverters (CSIs), impedance source inverters (ZSIs), and boost inverters are the high-end candidates. The aspects of cost, footprint, and minimal numbers of active switches, in addition to simplified controllability, build the main challenges that face the evolution of robust renewable energy-associated grid-tied converters. This paper presents a novel three-phase differential-mode buck-boost inverter based on two bidirec-tional buck-boost DC/DC converters and one differential power processor (DPP) unit. The proposed topology is a single-stage DC/AC converter offering bucking/boosting capability, with reduced hardware requirements. The proposed topology features a simplified control methodology in addition to reduced size and cost of the hardware setup which makes it more suitable for grid-tied renewable energy applications. The operation principles, small-signal model, and control strategy of the proposed topology are also illustrated. Simulation and experimental results are presented in details to verify the topology-enhanced performance under various operating conditions. The deducted results elucidate the viability of the proposed configuration alongside with the claimed merits.
— Single stage four switches three-phase (FSTP) Buck-boost inverter is presented as a new topolog... more — Single stage four switches three-phase (FSTP) Buck-boost inverter is presented as a new topology able to operate within a high range of dc input voltage. The topology is characterized by its ability to achieve dc-ac conversion in addition to voltage buck/boost capability. Furthermore, the obtained output voltage is naturally sinusoidal, without any need of output filter, in comparison with the conventional FSTP inverter. Unlike its precedence, the presented topology employs fewer number of switching devices, inductors, and capacitors, resulting in a reduced cost and size. A non-linear slide mode control is applied on the proposed FSTP buck-boost inverter to tightly control its operational dynamics. The operation principles of the proposed topology are illustrated with mathematical analysis, while output results using MATLAB/SIMULINK are illustrated to verify the topology features. Keywords — single-stage inverter, buck-boost inverter, four-switch three-phase inverter, slide mode control and current mode control.
We use a new method in solar energy that concentrates the light in Photovoltaic and ... more We use a new method in solar energy that concentrates the light in Photovoltaic and increases the efficiency and decreases the cost. Moreover the system can be used to convert DC power from solar cells to AC by commutation without any electronic component
paper can be assisted and will save time of building a literature about PV by this ... more paper can be assisted and will save time of building a literature about PV by this review that is considered part of a series compares the performance of PV technologies. In this paper, a comparison survey is included which investigates the 3 generations of PV cells with the latest characteristics.
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Papers by Abdelrahman Farghly