Kamel Srairi

Application of a Novel Modified Hybrid Algorithm for Solving Dynamic Economic Dispatch Problem with Practical Constraints

The problem of finding out which positions are the most effective and how many flexible AC transmission system (FACTS) devices have to be installed and controlled in a deregulated environment on economic basis is a question of great significance for the dispatcher. This paper presents a flexible approach based in practical reasoning rules from fuzzy logic theory capable of governing multiple static VAr compensator (SVC) and a group of static compensator (STATCOM) by a flexible adjustment of reactive power injected or absorbed from the network. The main purpose of the presented coordinated strategy is the improvement of index power quality. Reactive index sensitivity coordinated with an expert rules to form a global database as a flexible tool to make an efficient decision about reactive power dispatch and to choose the size of the shunt FACTS controllers. Simulation results show clearly the advantage of this approach to enhance the reactive power planning.

In this paper an hybrid Genetic Algorithm and Fuzzy Logic rules is proposed to minimize the generator fuel cost with multi shunt Flexible AC Transmission Systems (FACTS). The problem is decomposed into, the optimal power generation subproblem that is searched by Genetic Algorithm and a simple practical reasoning fuzzy rules subproblem to control the reactive power exchanged with the network. The proposed method guarantees the near optimal solution and remarkably reduces the computation time. A global database generated based in reactive index sensitivity (RIS) as a flexible tool to choose economically the size of the shunt FACTS devices. This proposed approach is implemented with Matlab program with various case studies, and compared with conventional method and genetic algorithm (GA). The results show that the HGF can converge to optimum solution faster than other methods, and obtains the solution with high accuracy.

The problem of finding out which positions are the most effective and how many Flexible AC Transmission System (FACTS) devices have to be installed and controlled in a deregulated environment on economic basis is a question of great significance for the Dispatcher. This paper presents a flexible approach based in practical reasoning rules from fuzzy logic theory capable of governing multiple Static Var Compensator (SVC) and a group of Static Compensator (STATCOM) by a flexible adjustment of reactive power injected or absorbed from the network. The main purpose of the presented coordinated strategy is the improvement of system loadability. Reactive index sensitivity coordinated with an expert rules to form a global database as a flexible tool to make an efficient decision about reactive power dispatch and to choose the size of the shunt FACTS Controllers. Simulation results show clearly the advantage of this approach to enhance the reactive power planning.

The paper presents a three-phase power flow modelization: a tool for optimal location and control of FACTS devices in unbalanced power systems. The results obtained from single-phase power systems may be unrealistic and could not be able to characterize accurately the voltage stability problem of unbalanced power systems. In order to assess and investigate the importance of the three-phase power flow model proposed, a three-phase SVC model is implemented to regulate and control the reactive power injected or absorbed in the unbalanced three-phase power systems. It is strongly recommended that before location and implementation of new FACTS devices, a three-phase load flow modelling and study be made to find the best performance and arrangement. Numerical examples tested on the 5-Bus and 30-Bus IEEE system have demonstrated the approach proposed is effective

The paper presents a three-phase power flow modelization: A tool for optimal location and control of FACTS devices in unbalanced power systems. The results obtained from single-phase power systems may be unrealistic and could not be able to characterize accurately the voltage stability problem of unbalanced power systems. In order to assess and investigate the importance of the three-phase power flow model proposed, a three-phase SVC model is implemented to regulate and control the reactive power injected or absorbed in the unbalanced three-phase power systems. It is strongly recommended that before location and implementation of new FACTS devices, a three-phase load flow modelling and study be made to find the best performance and arrangement. Numerical examples tested on the 5-Bus and 30-Bus IEEE system have demonstrated the approach proposed is effective.