Application of SVM Technique for Three Phase Three Leg Ac/Ac Converter Topology

Ac–ac power conversion, the most popular topologies are indirect ac–ac converters with a dc link matrix converters and direct pulse width modulation (PWM) ac–ac converters. The indirect ac–ac converters and matrix converters can provide variable output voltage and variable frequency. However, for applications, where only voltage regulation is needed, the direct PWM ac–ac converters are used to perform as ac choppers or power line conditioners with the following features: the provision of a better power factor and efficiency, low harmonic current in line, single-stage conversion, simple topology, ease of control, smaller size, and lower cost. The ac–ac conversions or ac–ac line conditioners can also perform conditioning, isolating, and altering of the incoming power in addition to voltage regulation. The direct PWM ac–ac converters can be derived from the dc–dc topologies, where all the unidirectional switches are substituted by bidirectional devices. This paper presents simulation of a Three-phase Three-leg Ac/Ac Converter simulation design using reduced number of power semiconductor devices, here nine IGBTs are used. This converter features sinusoidal inputs and outputs, unity power factor, and more importantly, low manufacturing cost. The experimental results from a 5kVA prototype system are provided. Index Terms -AC/AC converter, reduced switch count topology, SVPWM