A second‐order sliding mode control with active disturbance rejection for dynamic voltage restorers

This paper proposes an extended state observer (ESO)-based second-order sliding mode control (SMC) for dynamic voltage restorers (DVRs). Unlike the conventional first-order SMC and some (SOSMC) methods that suffer from chattering, proposed method can alleviate chattering achieve finite-time convergence. Chattering suppression (i.e. eliminating discontinuities) is achieved via continuous input which also used to generate pulse width modulation signals. However, while removing discontinuities in input, performance of degraded when it subjected disturbances. Therefore, active disturbance rejection (ADR) based on ESO enhance performance. In addition, advanced single-phase phase-locked loop (PLL) using linear quasi-type-1 PLL proposed. The effectiveness verified through simulation experimental results are compared with existing applied DVR.