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Abstract-Harmonics that arise from the interaction of thyristor controlled reactors (TCRs) and power systems are difficult to analyze. Two methods are described. The first develops a Fourier matrix model for the TCR. The coupling between the harmonics through the system impedance is clearly shown. The second method uses state variable analysis to write the system equations for a circuit containing a TCR. The systems of equations that result are linear with time varying coefficients. Using linear system theory statements and resonance can be made. Simulation of FC-TCR was done and FFT analysis is performed using matlab .The spectrum for the current is presented.

This paper deals with digital simulation of power system using five level inverter based UPFC to improve the power quality. The UPFC is capable of improving transient stability in a power system. It is the most complex power electronic system for controlling the power flow in an electrical power system. The real and reactive powers can be easily controlled in a power system with a UPFC. The circuit model is developed for UPFC using rectifier and inverter circuits. The control angle of the converters is varied to vary the real and reactive powers at the receiving end. The Matlab simulation results are presented to validate the model.

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