Abstract
With consideration of use of solar, wind and other renewable energy source for industrial applications like electric vehicle drive, train traction and FACTS integration, which demand voltage levels in the range of kilo volts with high power quality, to achieve this high voltage level and high quality of power, a cascaded H-bridge multilevel inverter based topology capable of operating with low harmonic distortion is proposed in the paper. In order to attain low total harmonic distortion (THD), use of phase disposition-PWM technique is proposed in the paper. Giving due attention to both switch count and low THD, the output voltage levels of the multi-level inverter are set at 15 levels. Due to half wave symmetry the even order harmonics for proposed system become zero and the lower order harmonics reduces which is shown in tabular from. Due to reduced switch count and low THD the overall system become more efficient and effective. The effectiveness of the proposed control strategy has been verified using MATLAB simulations. Simulation is done for both symmetrical as well as asymmetrical multilevel inverter topology. It is observed that quality of the output voltage waveforms of the multi-level inverter (MLI) is as per the IEEE std 519 specifications. For symmetrical reduced switch fifteen level inverter the THD is 4.42% and for asymmetrical topology THD is 4.59% for the output voltage waveform.
Highlights
Owing to the deteriorating environmental conditions and diminishing energy resources, the recent research trend has been focusing towards the enhanced use of renewable energy sources
The reduced switch topology proposed by Rohit Kumar et al [4] has been considered and a phase disposition Pulse width modulation (PWM) (PD-PWM) technique is proposed for the reduction of harmonics
To improve power quality of the system Phase Disposition (PD)-PWM technique has been developed for the reduction in harmonic distortion
Summary
Owing to the deteriorating environmental conditions and diminishing energy resources, the recent research trend has been focusing towards the enhanced use of renewable energy sources. In this regard, solar and wind energy based applications have been the favorite topics in the field of power electronics [1]. Multilevel inverters have come up as an overriding solution for such high power and medium voltage energy operations [2]. The vital concern with the multilevel inverters is topology, power quality and control operations. Irrespective of the topology, generation of such high voltage levels is an issue in terms of power quality. The reduced switch topology proposed by Rohit Kumar et al [4] has been considered and a phase disposition PWM (PD-PWM) technique is proposed for the reduction of harmonics
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