a new multi-stage fuzzy (msf) controller based on multi-objective harmony search algorithm (mohsa) is proposed in this paper to solve the load frequency control (lfc) problem of power systems in deregulated environment. lfc problem are caused by load perturbations, which continuously disturb the normal operation of power system. the objectives of lfc are to mini small size the transient deviati...

The unified power flow controller (UPFC) is a typical FACTS (Flexible AC Transmission Systems) device that is capable of instantaneous control of transmission line parameters. This paper presents the transient model and control system of UPFC. The presented control system enables the UPFC to following the exchanges of line active and reactive power reference values, regulating the DC link and b...

This study inspects the optimum location of STATCOM device in long transmission line to acquire the maximum power system transient stability improvement. STATCOM is a kind of prominent and effective shunt FACTS device which is used in power system to enhance the power system stability and to regulate the line voltage. When it has been placed at the center point of a transmission line, play a ke...

This paper proposes a Principal Component Analysis (PCA)-based method to construct composite indices rapidly assess power system transient stability. By assigning appropriate weights few selected sub-indicators, index can be constructed guarantee better coverage of worst-case stability scenarios the system. provides an automatic with four sub-indicators calculated by integral acceleration, spee...

Power system transient can cause serious damage to main power system apparatus and sensitive loads. There are many causes of power system transient including capacitor bank switching, switching of large inductive loads and lightning. This paper discusses the application of pattern recognition method, namely Support Vector Machine (SVM) to classify the cause of transient disturbance in power sys...