An Adaptive-Gain Super-Twisting Position Observer for Grid-Interfaced SRM Water Pump

Abstract

This work contributes for the development of a low-cost reliable switched reluctance motor (SRM) drive for domestic water supply requirements. The work presents an adaptive gain super twisting sliding mode observer (AGST-SMO) for SRM drive with an enhanced transient behaviour. An online updation of sliding gains is proposed while satisfying the stability conditions of the observer. Performance of this observer is compared with the existing sliding mode observers. The developed SRM drive has a dedicated-port configuration to integrate the sources with SRM-pump and a domestic equipment, with reliable operation at low cost. For grid-side power quality issues, an improved linear sinusoidal tracer (ILST) is employed for the control of voltage source converter (VSC). ILST has inherent merits like active harmonics filtering, power factor correction, and fast dynamic response. The control of the drive system is validated by developing laboratory scale prototype and the system performance is examined at different conditions. The drive is suitable to fulfil water requirements for various applications at the consumer-end.