Akademik Veri Yönetim Sistemi
1st International Conference on Innovative Academic Studies, Konya, Türkiye, 10 - 13 Eylül 2022, ss.1362-1366
Computer power supplies, adjustable speed drives, furnaces, uninterruptible power supplies and power converters act as nonlinear loads (NLL) to AC supply systems and result in lower power factor, harmonic injection and poor voltage regulation. This paper examines a control scheme to achieve multiple functions to a grid-connected three-phase shunt active power filter (SAPF) to provide harmonic compensation and good power factor correction (PFC) capability. The control scheme consists of a reference current generation based on the DC-link control and second order generalized integrator (SOGI) based frequency adaptive filters, which enhance the power quality under critical loads such as NLLs and highly inductive NLLs. The SOGI-based frequency adaptive filter has been employed to extract harmonic currents of the NLLs. The outer loop is designed based on the proportional integral (PI) control to provide the regulation of the DC-link voltage. The proposed control scheme lessens the total harmonic distortion (THD) and enhances the power factor of the main grid. Simulation tests based on PSCAD/EMTDC environment are presented to validate the proposed control approach and confirm the operation of the grid connected SAPF under various load groups and distorted grid voltages. The acquired results show that the proposed control scheme can accomplish the objectives under sensitive loads and distorted grid voltages.