Real-Time Implementation of Voltage Dip Mitigation using D-STATCOM with Fast Extraction of Instantaneous Symmetrical Components

This paper presents the application of the proposed efficient least squares algorithm in power supply voltage dip and unbalance detection for mitigation using a D-STATCOM. The proposed method is capable of identifying the instantaneous symmetrical components of the fundamental frequency accurately even though the point of common coupling voltage is strongly corrupted by the voltage harmonics. Also, it fulfils the specific requirements of the fast transient response, accuracy and robustness in order to ensure the satisfactory performance of the mitigation system. The proposed method extracts detecting the positive- and negative-sequence components and then using those sequence components for generating reference values of current that need to be injected into the point of connection D-STATCOM in order to compensate the voltage errors. Furthermore, the suitability of the proposed method in balanced/unbalance voltage dip compensation is verified by a experimental studies.