Abstract

The multilevel converter has drawn tremendous interest in the power industry. The general structure of the multilevel converter is to synthesize a sinusoidal voltage from several levels of voltages. Multilevel voltage source converter topologies can generate high-quality voltage waveforms with power semiconductor switches operating at a frequency near the fundamental. Among the available multilevel converter topologies, the cascaded multilevel converter constitutes a promising alternative, providing a modular design that can be extended to allow a transformer less connection. A three-phase, seven level cascaded multilevel voltage source inverter with reduced number of switches based DSTATCOM for power line conditioning to improve power quality in the distribution network is used which will compensate the distorted line current harmonics and reactive power. The reference currents for generating switching signals of multilevel inverter are obtained using Instantaneous Real Power Theory.

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