The nonlinear loads create power-quality (PQ) issues in the electrical distribution system. Various types of power electronics-based devices are being used to minimize the PQ problems in the distribution system. These devices inject currents and voltages into the grids. Mostly, a phase-locked loop (PLL) is utilized for the estimation of synchronous data like voltage magnitude and phase angle. However, the occurrence of DC offsets and harmonics in grid voltage creates fundamental frequency oscillations. To overcome these issues, an advanced second order generalized integrator (SOGI) based PLL is usually used. Hence, SOGI-based advanced controllers are being developed and used for generating reference current to inject the triggering pulses to the distribution static compensator (DSTATCOM). This work provides a comparative analysis of various SOGI-based advanced controllers to reduce the harmonics and DC offsets problems with DSTATCOM in the distribution system. The performance of the controllers is analyzed and compared.
Ram et al. (2026) studied this question.