Ahmed Saad Hasan AL AMERI

This paper presents a control strategy of Doubly Fed Induction Generator (DFIG) based wind turbine under electrical grid disturbance. Two mains problems are faced by DFIG; fluctuating output power and Low-Voltage Ride Trough capability (LVRT). In order to smooth the output power injected in the electrical grid and to improve dynamic behavior of DFIG under symmetrical voltage dip, a control strategy of the Battery Energy Storage System (BESS) is presented. Simulations have been carried out, and the results demonstrate the effectiveness of our control.

This paper presents a linearised model for a Distributed Generation (DG) network with the aim of estimating optimal size of DG using Kalman filter and graph theory. Relationships between the active power and voltage angle and between the reactive power and voltage magnitude are utilised to determine the minimum real power loss and voltage profile of the distributed network. A 2-stage method is suggested to estimate the best size of DGs. In the first stage, the graph flow method is used to generate the incident matrix to build the linear model and in the second stage, a Kalman filter algorithm is applied to obtain the optimal size of the DG at each bus system. The proposed method has been implemented and tested on standard IEEE 5-bus test system. Simulation results showed that the proposed method is of a significant time saving when compared to an existing method based on load flow.

This paper deals with a algorithm developed for load flow problems in electrical power systems. Jacobian matrix in Newton Raphson method require large computer memory and take more computation time in calculations. Schur complement method can be reduce memory required by divided Jacobian matrix into two separated matrices with reasonable computation time. The proposed algorithm used this method with threshold technique in order to test different power systems. Results has been compared with Newton Raphson method and Fast Decoupled method in term of influence of convergence properties and algorithm efficiency.

This paper presents Data Compression Simulated algorithm for load flow calculation in electrical power systems. Real time monitor of grids required less computation time in calculation of power system analysis. Load flow problem is heart of this analysis and it basically required calculate active and reactive power flow in lines connected between buses in networks. Many topology and structures for Transmission and Distribution Systems has been proposed to reduce CPU times and memory. The proposed algorithm used Data compression technique tested different systems and results shows it is efficiency. More accuracy for large systems will need more iterations calculation which mean increasing time consumption, while Run Length Encoding (RLE) algorithm is fitness to optimized calculation numbers to exact number cause it has no zero values included. Network structure was represented as one dimension vector instead of 2D Matrix and it is effectiveness results was valid, by avoid exponential increased, by utilized this algorithm. Matlab results obtained by applied this algorithm match theoretical results.

The capability of the classical network to support the level penetration of Distribution Generation (DG) has been present to analysis how to achieve a better integration of flexible demand of Electrical Networks(Mesh and Radial systems). Based on this analysis, two simulation algorithms have been proposed to reduce CPU time and memory, can help the grid operator to assess power situation and increase penetration level of DG. Firstly, It deals with an algorithm developed for power load flow studies in electrical power systems using Schur complement method. By dividing Jacobian matrix into two separated matrices with reasonable computation time, It could be avoided divergence of the solution. A next step that was applied concerned Data Compression for the Simulated algorithms conceived to study load flow calculation in electrical power systems. Real time monitor of grids required less computation time in calculation of power system analysis. It proposed an algorithm based on Run Length Encoding (RLE) method where no zero values are included. Matlab results obtained by applying these algorithms match the analytical approaches. Results have been compared with Newton Raphson and Fast Decoupled methods in term of influence of convergence properties and it's efficiency. These methods have been implemented and tested on several IEEE bus test systems.

This paper presents a study development based on a hardware in the loop simulation for wind and tidal current power systems. We used the similarities between technologies for wind turbines and for the tidal current power systems. We analyze and develop an experimental system consisting two main parts: a real time software simulator and an electromechanical system. The Electromechanical System is composed from three electrical drives: an asynchronous machine that emulates the tidal current power systems, an asynchronous generator, used to study the energy conversion and grid connection. The Software simulator is a supervising and control subsystem and is composed from a computational unit and different interface devices. The studied system is a variable speed turbine system based on Double Fed Induction Generator (DFIG). The stator of the generator firstly is directly connected to the grid and secondly passes through a converter. Experimental results from the simulator are presented in order to compare different simulation procedures.

Poster in French language

Market and electricity companies are interested to reduce costs by increasing penetration level of DG's in utility systems with best integration and developing measurements. Mesh and Radial distribution systems have different structures which change the capability of the network to support the level penetration of Distribution Generation (DG). The capability of the classical network to support the level penetration of Distribution Generation (DG) could be changed according different structures of distribution systems (Mesh and Radial systems).An overview of impact of DG on these different structures with different voltage levels is presented with respect to different issues like power losses, voltage profile, protection, reconfiguration, load balance, reliability, planning and cost. Review of recent researches on these subjects has been present to analysis how to achieve a better integration of flexible demand with Distributed Generation. This would lead to an increase of the use of Distributed Generation and a decrease of problems caused by intermittent distributed generation in electricity systems and at the electricity market. Based on this analysis, we emphasized that distribution topologies have different impact depending on size and type of DG as well as penetration level of it

Poster en french language