FFDSOGI-PLL-based DSTATCOM for Power Quality Enhancement

Abstract

This paper proposes a control technique based on a frequency-fixed dual second-order generalized integrator phase-locked loop (FFDSOGI-PLL) for a Distribution Static Compensator (DSTATCOM). The goal is to mitigate power-quality (PQ) issues in a three-phase distribution network with a weak grid. The phase angle, symmetrical components, and positive sequence of supply voltages were estimated using the FFDSOGI-PLL even in a polluted grid environment. The active component magnitude of the fundamental load current was extracted using SOGI, which also reduces the PQ issues by generating compensating current. The effectiveness of the proposed FFDSOGI-PLL-based DSTATCOM was verified for functions like load balancing, power factor correction (PFC), harmonics reduction, etc. This was done in MATLAB/SIMULINK under steadystate and dynamic conditions. The simulation results show that the FFDSOGI-PLL-based control algorithm has faster convergence and quick dynamic response. Hence, the DSTATCOM performance is satisfactory for mitigating PQ issues with the FFDSOGI-PLL-based control technique.