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Staff Researches

Mohamad Abd-Alraheim Badr

An Efficient Speed Controller of Three Phase Induction Motors Through Direct Torque Control

Mohamed Abdelreheim Mohamed Badr

Madbouly, S. O, Soliman, H .F

Proceedings of future university first international conference on new energy and environmental engineering (ICNEEE-2016),Cairo, Egypt,April,11-14,2016,pp.35-42.

2016

for three phase (3-ph) induction motors based on direct torque control (DTC). The main function of the DTC is to control the flux, developed torque and the direction of rotation. Many industrial applications require a precise speed control. Most of the available controller techniques could not grantee keeping the 3-Ph induction motor speed constant, while subjected to mechanical load disturbances. A high rejection of the effect of mechanical disturbance is achieved through using the proposed technique with an excellent motor speed regulation as shown in the simulation results. Different speed trajectories have been carried out to verify the robustness of the controller. A variable gain PI controller is introduced to cover all speed references and provide to be an efficient controller. Keywords— Speed Control; 3-Ph Induction Motors; Direct Torque Control; and Variable Gain.

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Sizing Of Reactive Power Compensators For Onshore And Offshore Grid Connected Wind Farms

Mohamed Abdelreheim Mohamed Badr

Ahmad,M.and Elshimy,M

Industry Academia Collaboration (IAC) Conference, Energy And Sustainable Development Track, Apr. 6 – 8, 2015, Cairo, Egypt.

2015

Sizing Of Reactive Power Compensators For Onshore And Offshore Grid Connected Wind Farms

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A Microturbine Interface System with LVRT Capability

Mohamed Abdelreheim Mohamed Badr

The Australasian University Power Engineering Conference (AUPEC 2014).

2014

Microturbine Units (MTU) are used widely as distributed generators for their proved advantages. This paper presents an interface system for the Microturbine Unit (MTU) based on back-to-back converter to operate in grid connected and islanding modes. Besides regulating the active power fed from the MTU, during the grid-connected mode, the proposed interface system regulates the Point of Common Coupling (PCC) voltage at its rated value. Moreover, the proposed interface system is controlled to have a Low Voltage Ride-Through (LVRT) capability by feeding the grid with reactive power during grid faults. Furthermore, the proposed interface system keeps the voltage and frequency at the load terminal during the islanding mode of operation with the same control structure. Simulation results are provided to evaluate the dynamic performance of the proposed MTU interface system at the different modes of operation.

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Advanced modeling and analysis of the loading capability limits of doubly-fed induction generators

Mohamed Abdelreheim Mohamed Badr

Sustainable Energy Technologies and Assessments Journal ,vol.7,Sept.,2014pp.70-90

2014

This paper presents an improved mathematical model required for evaluation of the steady-state power characteristics and loading capability limits of doubly-fed induction generators (DFIGs). Unlike the previous models, this model takes into consideration the effect of the losses, rotor power flow, and power factor settings of the grid-side converter (GSC). The impact of various variables and parameters on the loading capability is determined through detailed analysis of the loading capability limits as well as a parametric analysis. Simulation results show that DFIGs can provide a continuous controllable reactive power support to electrical grids. In addition, the results set rules for enhancing the reactive power capability of DFIGs based on its sensitivity to various parameters and variables of the machine and its controls. Although, squirrel-cage induction-generators (SCIGs) that connected directly to the grid do not have a reactive power capability and their reactive power consumption is uncontrollable, its loading characteristics are also presented for illustrating the value of the partial-scale converter in operational flexibility enhancement in DFIGs based systems.

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Coupling of Wind Farms with Nuclear Power Plants

Mohamed Abdelreheim Mohamed Badr

GCC POWER 2013 CONFERENCE & EXHIBITION ِ Abu Dhabi- UAE 18th – 20th November 2013

2013

Countries in the Arab region are planning to meet their increasing electricity demands by increasing both nuclear and Renewable Energy (RE) contributions in electricity generation. In the planning phase of siting both new Wind Farms (WFs) and Nuclear Power Plants (NPPs), many benefits and challenges exist. An important aspect taken into consideration during the NPP siting is the existence of ultimate heat sink which is sea water in most cases. That is why most NPPs are sited on sea coasts. On the other hand, during WF siting, the main influential aspect is the existence of good wind resources. Many coastal areas around the world fulfill this requirement for WF siting. Coupling both NPPs and WFs in one site or nearby has many benefits and obstacles as well. This coupling can help in the geographical distribution of WFs along the countries territories by installing WFs at or near to the NPP area. This geographical distribution will make use of the low density population area around NPPs and smoothen the WF’s output power injected into the grid. Due to wind speed fluctuations, the value of the output of WFs’ power is less than their installed capacity. Thus, WFs’ capacity credit is evaluated to find out the corresponding value of the thermal power plants to be installed in the grid in order to satisfy the required system reliability. In this paper, the implementation aspects of NPP and WF coupling/adjacency will be discussed in detail. Based on international experience and literature reviews, the benefits and obstacles of this coupling/adjacency are studied and evaluated. Various case studies are carried out to verify the coupling/adjacency concept. The benefits of WF geographical distribution are examined on two candidate sites in Egypt. The WF capacity credit is calculated by implementing the PJM method using actual three-year hourly wind data. The obtained results are evaluated to study their applicability in the Egyptian environment and their applicability for countries in the Gulf region. Finally, both the coupling idea and the capacity credit values can be used to help decision makers in the planning phase as well as in the selection of WT characteristics as discussed in this paper.

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Fuzzy logic control of brushless doubly fed induction generator

Mohamed Abdelreheim Mohamed Badr

The 5th IET International Conference on Power Electronics, Machines and Drives ,.2010

2010

This paper presents a new fuzzy logic control algorithm to improve the dynamic performance of the brushless doubly fed induction generator (BDFG). Also, an independent control of the active and reactive power is achieved. The system under study consists of a BDFG driven by a voltage source bi-directional converter. The machine model in d-q power winding (PW) synchronously rotating reference frame is formulated in Matlab/Simulink. Both, the active and reactive control paths are implemented using Fuzzy logic controllers (FLC). Meanwhile each path includes two fuzzy logic controllers, one is used for the outer control loop and the other for the inner control loop. The dynamic performance of the BDFG has been tested when the overall system is subjected to a step change in active and reactive power respectively. The simulation results show that the FLC enhance the dynamic response of the overall system compared with conventional proportional plus integral controller. It achieves also independent control of the active and reactive power with reduced cross coupling effect.

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ANN-Based Optimal Energy Control ofInduction Motors

Mohamed Abdelreheim Mohamed Badr

IEEE Transactions on Energy Conversion . Ieee Transactions On Energy Conversion, VOL. 25, NO. 3, September 2010, pp 652-660.

2010

This paper investigates the opportunity for energy saving in a three-phase induction motor (IM) driving pump load and proposes an improved loss model control (LMC). Compared with other power-loss reduction algorithms for IM, the presented one has the advantages of fast and smooth flux adaptation, high accuracy, and versatile implementation. The performance of LMC depends mainly on the accuracy of modeling the motor drive and losses. In this paper, the derived loss model considers the surplus power loss caused by inverter voltage harmonics using closed-form equations and also includes the magnetic saturation. An artificial neural network controller is synthesized and trained offline to determine the optimal flux level that achieves maximum drive efficiency. The drive's voltage and speed control loops are connected via the actual stator frequency, making the scheme comparatively reliable. Simulation and experimental studies are performed on 5.5-kW test motor using the proposed control method. The test results are provided and compared with the fixed flux operation to validate the effectiveness.

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," Application of LQR Theory to the Stator Field Oriented Control of Induction Motors

Mohamed Abdelreheim Mohamed Badr

IET , Electrical Power Appl., 2010, Vol. 4, Iss. 8, pp. 637–646.

2010

Realisation of a digital control system, which implements a complete state feedback control strategy for the voltage-source inverter-fed induction motor (IM) drive, is reported. The controller design is based on the application of the linear quadratic regulator (LQR) theory to a linearised state-space model for the machine in the synchronous frame. The control objective is to achieve rotor speed control and orientation of the stator flux vector at constant magnitude by adjusting the stator voltage and frequency. To overcome the detrimental effects of inevitable modelling errors and disturbances, the structure of the feedback controller used here resembles that of the classical proportional-integral controller but is more versatile. The control system design considers the inverter-s output limits and proposes an anti-windup scheme to avoid instability risk under integral windup. A supplementary feedforward control loop is provided to enhance transient response of the controlled drive by utilising few future values of the speed reference and load torque signals in advance. The hardware implementation of a controller is discussed and experimental tests are presented, along with computer simulation results, to verify the validity of the method.

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Improving the Dynamic Performance of Brushless Doubly Fed Induction Generator Driven by Vector Control with Variable Gain

Mohamed Abdelreheim Mohamed Badr

Proceedings of the 13th Middle East International Conference on electrical power systems (MEPCON 2009) , Assiut, Egypt, Dec,2009, Vol.. ,pp. - .

2009

Improving the Dynamic Performance of Brushless Doubly Fed Induction Generator Driven by Vector Control with Variable Gain

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ANN for Subsynchronous Resonance Detection

Mohamed Abdelreheim Mohamed Badr

Paper No: WCEEENG_A02_172., T he 2009 World Congress on Electronics and Electrical Engineering , WCEEENG'09,April 6-9, 2009.

2009

ANN for Subsynchronous Resonance Detection

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Analysis of Subsynchronous Resonance Using Neural Networks

Mohamed Abdelreheim Mohamed Badr

Bulletin of the college of Engineering, Ain- Shams Univ.(ASIEE),Vol.1,Jun 2, 2009,pp.269-279.

2009

Analysis of Subsynchronous Resonance Using Neural Networks

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The 26 National Radio Conference (URSI26), Scientific Research Academy in co-operation with Future University in EGYPT (FUE)

Mohamed Abdelreheim Mohamed Badr

FUE Cairo Egypt

2009

Vice President of the Conference

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