A New Asymmetric-twin-converter Based Statcom Applied to Induction Motor Drive with Dc Voltage Control

To provide transmission-line voltage support, a static compensator (STATCOM) offers the optimal solution in terms of price, reliability, and dynamic performance. Simpler layout for switches, reduced component count and smaller dc-link capacitor values are the attractive features of the proposed topology over the diode clamped and cascaded multilevel converter. Two dc-link voltage sources with voltage ratio of approximately 1 : 0.366 are required for the present drive. Suitable selection of the dc-link voltage values reduces distortion in the current fed to the grid. This reduces the number of independent dc capacitor voltages to be controlled and to drive the induction motor that eliminates the flow of third-harmonic current through the transformer. In order to improve the performance, a phase-shifted carrier-based pulse width modulation technique is used. A mathematical model of the system is derived, based on which a controller for the scheme is designed. The transformer primary voltage and current is measured when applied to induction motor drive. The AssymmetricTwin-Converter topology used for harmonic elimination and suppression applied to induction motor drive to improve the performance of drive . The effectiveness of the scheme is verified through detailed simulation study.