Abstract
This study proposes a simple control algorithm for LCL-filter-based distribution static compensator (DSTATCOM) for power quality improvement. The proposed algorithm is able to operate DSTATCOM in both current control mode (CCM) and voltage control mode (VCM) by controlling point of common coupling (PCC) voltage. However, in the conventional method, controlling both filter current and PCC voltage is required to operate DSTATCOM in CCM and VCM, respectively. The achieving of CCM and VCM operations with only PCC voltage controlling method reduces the computational burden on the controller since it eliminates the necessity of filter current sensors. For smooth reference tracking, the interfacing LCL-filter parameters are designed based on the switching dynamics of hysteresis controller (HC) and harmonic order to be compensated by DSTATCOM. The total interfacing inductance value required in LCL DSTATCOM is low when compared with conventional DSTATCOM ( L -filter-based DSTATCOM); therefore, the required dc-link voltage is reduced. An adaptive dc-link voltage control has been implemented to improve LCL-DSTATCOM performance in terms of switching voltage stress and efficiency. To show the efficacy of the proposed algorithm, simulation and experimental studies have been performed.
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