Abstract
A new structure of switched capacitor multilevel inverter (SCMLI) capable of voltage boosting and with self-balancing ability is introduced in this article. This advantage is the result of a step by step rise of capacitor voltages in each module, supplied by just one DC voltage source. The proposed topology generates a sinusoidal output waveform with a magnitude several times greater than the input one. Higher output staircase AC voltage is obtained by applying a nearest level control (NLC) modulation technique. The most significant features of this configuration can be mentioned as: fewer semiconductor devices, remarkably low total harmonic distortion (THD), desirable operating under high/low frequency, high efficiency, inherent bipolar voltage production, easy circuit expansion, ease of control and size reduction of the circuit thanks to utilizing neither bulky transformer nor inductor. Moreover, the proposed SCMLI is comprehensively surveyed through theoretical investigation and a comparison of its effectiveness to recent topologies. Eventually, the operating principle of a 25-level prototype of the suggested SCMLI is validated by simulation in the MATLAB SIMULINK environment and experimental results.
Highlights
The growth of energy consumption and reduction in fossil fuel reserves has led to renewable energy penetration in power system
Evaluation of the proposed theory is comprehensively accomplished in both simulation and Evaluation of the proposed theory is comprehensively accomplished in both simulation and experimental sections which are exclusively explained in the following parts
In order to prove the concept of the presented structure, MATLAB simulations were done on a
Summary
The growth of energy consumption and reduction in fossil fuel reserves has led to renewable energy penetration in power system. In order to transmit the electricity generated by these sources to grids, power electronic devices are widely required. The noticeable role of power electronic converters in these applications have attracted the attention of many researchers aiming for augmentation of quality, efficiency and costs of such systems [1]. Among all kinds of power electronic converters, inverters are vitally required in such equipment. Built in three-level topologies, suffered from high voltage stresses and total harmonic distortion (THD) [3]. Consideration of these limitations, resulted in the introduction of the multilevel inverter (MLI). Quality improvement of output voltage wave form depends on the number of voltage
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