Multi-level swell voltage control for minimising damage to an on-grid system

Abstract

This article presented multi-level swell voltage control for minimising the damage to an on-grid system between 1.3 to 1.8 pu. in compliance with the value regulated by IEEE and IEC standards. A window comparator circuit and comparator circuit with hysteresis transistor were used as the voltage detector and excessive pulse entering the multi-level control of the load. According to the designed function at every stage in the form of fail-safe AND gate, the system was set for this case by turning to the fail-safe mode in order to prevent a fail-dangerous mode that might harm the electric system if the device in the detection circuit is deprived of a qualification that is against the condition. Due to the Failure Mode and Effect Analysis (FMEA) in accordance with IEC-6196-1, the function prevents electric and electronic devices in the on-grid system from incurring damage. The design and installation of the electric protection device SVSS have a parallel-connect with the electric system without concern for the load current.