Dynamic protection of power converters associated with the grid using shunt active filter and thyristor switched capacitor for power quality enhancement [articol]

Abstract

The major problems with the high power converters connected to the grid are the increased currents harmonics introduced by switching and the poor power quality. Further, it is essential to identify and recover the system during the fault occurance. Failure to recover the power converters from the fault will lead to jeopardy and hence is not preferred. A dynamic system is proposed for the fault isolation and the power quality improvement. The proposed system uses shunt active filter (ASF) and Thyristor Switched Capacitor (TSC) to recover the converter from the fault condition. The proposed system is designed, simulated and implementated. The simulations were made with and without faults triggered at desired intervals. The simulated results are further validated with the hardware setup. When the fault is triggered, the output voltage is disrupted by the fault, when the shunt active filter and Thyristor Switched Capacitor (TSC) are inactive. The results validate that the proposed sytem greatly reduces the currents harmonics and improves the power factor.