ABSTRACT:
In
the low voltage based renewable systems like PV and Fuel cell applications, the
step-up of the output voltage to drive the loads is essential. For this, the
integration of switched-capacitor (SC) units with the dc-ac converters will
have the potential advantages like improved efficiency, optimal switching devices,
small size of passive elements (L and C) as compared with traditional two-stage
conversion system (dc/dc converter and dc/ac converter). This paper focuses on
a new family of step-up multilevel inverter topologies with switched capacitor
integration with dual input voltage sources. With the flexibility of 2 dc sources
and switching capacitor circuits, four different topologies have been suggested
in this paper with features of high voltage gain, reduced component count,
reduced voltage stress and self-voltage balancing of the capacitor while
achieving a higher number of levels. A detailed analysis of proposed multilevel
inverters has been analyzed with the symmetrical and asymmetrical mode of
operations and the associated gain, the number of levels, and other performance
indices are presented. An in-depth study of all the topologies has been
accomplished in this paper with several comparative studies in terms of
components count, voltage gain and cost. The effectiveness and practicability
of the suggested topology with 13 level output voltage has been explained by
the experimental results obtained from a scale down prototype.
KEYWORDS:
1. Hybrid
Reduced Switch Bidirectional Cascaded H-Bridge Multilevel Inverter
2. Pulse
Width Modulation (PWM)
3. Total
Harmonics Distortion (THD)
SOFTWARE:
MATLAB/SIMULINK
CONCLUSION:
In
this paper, a new family of dual input-driven multilevel inverters with the
integration of switched-capacitor units for attaining the boost capability as
well as multilevel voltage has been discussed. For this, various multilevel
inverters have been analyzed with the symmetrical/asymmetrical dc sources as
well as different switched capacitor arrangements, and the detailed pros and
cons of all configurations are presented. The higher voltage level generation,
step-up operation, and lower voltage stress of the switches have been the main
features of the proposed topologies. The comparative analysis is provided to
highlight the benefits of the proposed topologies over the various multilevel inverters
present in the literature. To show the effectiveness of the proposed
topologies, a laboratory prototype of PT-I with the symmetrical sources is
designed in the laboratory which will produce 13 levels and associated experimental
results are provided. Different real-time operating conditions (like a step
change in load, power factor, MI, and frequency) have been tested with the
proposed topology and the experimental results show good agreement with the
simulation results.
REFERENCES:
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