Sarathi, Partha and K, Siva Kumar
(2017)
Analysis for Optimal Distribution of PV Sources
& Fault Tolerance in Multilevel Inverters for PV Applications.
Masters thesis, Indian Institute of Technology Hyderabad.
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Abstract
Renewable Sources are the future of electrical energy in coming decades. Power electronics converter
will play a crucial role to bridge the gap between uncertainty of renewable sources & increasing load
requirements. Two level inverters are used by industries as power electronic converter to �ll this gap.
As load side requirement is for good power quality & a huge amount of power now a days, Multi-level
inverters are better option due to less harmonics, less voltage stress & better reliability. Due to these
advantages, these converters are preferred for high power application. With all these advantages, it
has some challenges like energy balancing, fault tolerant capabilities etc. The objective of this thesis
is improve the energy balancing between sources in multi-level inverter topologies having more than
one sources. For energy balancing between sources, this thesis proposed a mathematical analysis
for distribution of panels and power backup batteries according to their load share. This analysis of
energy associated with voltage level is valid for any multi-level inverter topology having more than one
source. This analysis is validated for a case study based on n-Level NPC inverter. Energy associated
with each source is calculated for n-Level NPC inverter. This energy association with each source
is proved through simulation and experimental results for �ve-level NPC inverter. In addition , zero
sequence voltage injection method is used to get better performance during fault condition in multi
phase inverter in this thesis. For multi phase inverter, zero sequence injected PWM is proposed for
balanced load supply during fault condition. Simulation is presented for 3-phase with fault in one
phase & for 5 phase with fault in one phase, two phase.
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