A Matlab-Simulink Model of AC grid with a FC-TCR and invariant control system for reactive power compensation

Matlab-Simulink Model of a three-phase grid with a system Fixed Capacitor - Thyristor Controlled Reactor (FC-TCR) for compensation of reactive power and for maintaining the power factor in the grid close to unity is presented. The specific features of the proposed model are applying the method of instantaneous powers for determining the load reactive power, and using a control system, whose structure as such ensures the constancy of the power factor, which is kept close to unit (the invariant character) without involving an automatic control system. The model of the control system is made maximally close to its hardware implementation. A detailed description of the system blocks is given. The results of the model tests under various loads - including the results of harmonic composition of voltage and currents - are given.