Open AccessProceedings Article
Modeling and analysis of multilevel inverters using unipolar and bipolar switching schemes
Khaliqur Rahman,Abu Tariq,Farhad Ilahi Bakhsh +2 more
- pp 466-471
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TLDR
The conventional P WM inverter and the cascaded multilevel PWM inverter is modeled in MATLAB Simulink using unipolar and bipolar switching schemes and the results are compared.Abstract:
For higher power applications, multilevel inverter structures have the particular advantages of operation at high dc-bus voltages which is achieved using series connection of switching devices. Moreover, a reduction in output voltage harmonics is achieved by switching between multiple voltage levels. The two most common multilevel inverter topologies are the diode clamped inverter and the cascaded inverter. In the paper, we will discuss about the cascaded multilevel inverter. The cascaded multilevel inverter uses series strings of single phase full bridge inverter to construct multilevel phase legs. A particular advantage of this topology is that the modulation, control and protection requirement of each bridge are modular. Moreover, multilevel inverter topologies are able to generate better output quality, while operating at lower switching frequency. This implies lower switching dissipation and higher efficiency. In this paper, the conventional PWM inverter and the cascaded multilevel PWM inverter is modeled in MATLAB Simulink. The analysis of the conventional PWM inverter and the cascaded multilevel PWM inverter using unipolar and bipolar switching schemes is done and finally the results are compared.read more
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References
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Direct repetitive control of SPWM inverter for UPS purpose
TL;DR: In this paper, a novel repetitive controller directly combined with an open loop SPWM inverter is presented, which achieves low THD% (1.4-1.7%) with nonlinear loads and fast error convergence (3-5 fundamental periods).
Book
Thyristorised Power Controllers
TL;DR: In this paper, a treatment of the principles of power electronics is presented, including high-power circuits associated with thyristorised power controllers and low-power electronic control circuitry vital to the operation of a practical system.
Proceedings ArticleDOI
Comparison between unipolar and bipolar single phase gridconnected inverters for PV applications
Les Bowtell,A. Ahfock +1 more
TL;DR: In this paper, it is argued that current controlled inverters offer significant advantages from the point of view of minimisation of current distortion, and the level of low frequency current distortion in the unipolar switched inverter is such that it can only comply with Australian Standard 4777.2 above a minimum output current.
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