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This paper investigates detailed flexible approach for incorporating various flexible alternating current transmission systems (FACTS) controllers in multimachine power system environment such as static var compensator (SVC) and thyristor controlled series capacitor (TCSC) in order to improve power system stability. The incorporation of FACTS devices into multimachine power system requires the development of the mathematical model of the power system with FACTS controllers. The differential algebraic equation (DAE) model of multimachine power system with FACTS controllers such as SVC and TCSC devices has been developed in this paper. Despite the fact that SVC and TCSC devices have been incorporated individually in DAE model of multimachine system, the DAE model with coordination of FACTS controllers has not been developed. So, the methodology of incorporation of series and shunt FACTS controllers in coordinated control manner in the DAE model of power system has been developed in this paper. Thus, the objective of this paper is to develop a general methodology of DAE model of power system with incorporation of series and shunt FACTS controllers in individual and coordinated control manner in order to improve power system stability. The western system coordinating council (WSCC) 3-machine, 9-bus system is used to illustrate the application of all proposed models and techniques. [ABSTRACT FROM AUTHOR]

This paper presents a method to design a control system for grid connected photovoltaic inverter which has an LCL type filter to suppress the output current total harmonic distortion (THD). In this control system, three linear voltage and current controllers were used in a cascade configuration in order to reduce the complexity of the system. Those controllers regulate the current injected to the grid in a synchronous reference frame which transforms ac variables into dc quantities and thus possibility of applying simple PI regulators. Simulation results, using Matlab/simulink, presented for this strategy confirm the effectiveness of the control scheme in both transient and steady state operation. [ABSTRACT FROM AUTHOR]