D-STATCON model for voltage sag mitigation

Development of a FACTS device model for mitigating voltage sag is
presented. It deals with a static synchronous condenser (STATCON) to be
used in the AC distribution networks. Simulation with the help of a
commercial software Matlab/Simulink was explored to investigate its
characteristics and performance during the voltage sag occurrence. The
considered main cause of voltage sag was the starting of high capacity
asynchronous motor. A voltage source inverter based on the phase-controlled
thyristor components was implemented in this application to compensate the
change in reactive power of the system. The concerns have been put on the
influence of initial operation point and DC capacitance. The study results
show the capability of D-STATCON model to reduce the consequence of
voltage sag following the starting of high-power asynchronous motor in the
distribution network. A fast response of the condenser work confirmed the
desired performance.