Download 14PE8 Current-Fed Switched Inverter IEEE Nag, S.S. Mishra, S

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Transcript
14PE8
Current-Fed Switched Inverter
IEEE Nag, S.S. Mishra, S.
Industrial Electronics, IEEE Transactions on (Volume:61 , Issue: 9 )
DOI: 10.1109/TIE.2013.2289907
Publication Year: 2014, Page(s): 4680 - 4690
Project Title
:
Current-Fed Switched Inverter
Domain
:
Power Electronics
Reference
:
IEEE
Publish Year
:
2014 Page(s): 4680 - 4690
D.O.I
:
10.1109/TIE.2013.2289907
Software Used
:
MATLAB
Developed By
:
Wine Yard Technologies, Hyderabad
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14PE8
Current-Fed Switched Inverter
High-boost dc-ac inverters are used in solar photovoltaic (PV), fuel cell, wind energy, and
uninterruptible power supply systems. High step-up and step-down capabilities and shootthrough immunity are some of the desired properties of an inverter for a reliable, versatile,
and low-distortion ac inversion. The recently developed Z-source inverter (ZSI) possesses
these qualities. However, the realization of ZSI comes at a cost of higher passive component
count as it needs two sets of passive filters. A switched boost inverter (SBI) has similar
properties as ZSI, and it has one L-C pair less compared to ZSI, but its gain is less than ZSI.
This paper proposes the current-fed switched inverter (CFSI) which combines the high-gain
property of ZSI and low passive component count of SBI. The proposed inverter uses only
one L-C filter and three switches apart from the inverter structure. The inverter topology is
based on current-fed dc/dc topology. Stead state analysis of the inverter is presented to
establish the relation between the dc input and the ac output. A pulse width modulation
(PWM) control strategy is devised for the proposed inverter. An experimental prototype is
built to validate the proposed inverter circuit in both buck and boost modes of operation. A
353-V dc-link and a 127 V (rms) ac are obtained from a 35.3-V dc input to demonstrate the
boost mode of operation. A 200-V dc-link and a 10.5-V (rms) ac are obtained from a 37.8-V
dc input to verify the buck mode of operation of CFSI.
Voltage source inverters (VSIs) find wide application in uninterruptible power supplies, solar
photovoltaic (PV) and fuel-cell applications, wind power systems, hybrid electric vehicles,
industrial motor drives, etc. [1], [2]. The limitation of traditional VSI is that its peak ac output
Voltage is always less than the input dc-link voltage [3]. Also, shoot-through in any of the
inverter legs is not permitted as it results in flowing of high short-circuits current. Therefore,
a dead-band is introduced between the switching signals of complementary switches of the
inverter legs, which, in turn, causes ac output distortion. High-boost inversion is essential
in small rooftop solar PV/fuel-cell applications when it is connected to 110–240-V ac
systems. For such applications, either a step-up transformer at the inverter output or a twostage boost-inverter structure is used.
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14PE8
Inverter systems with step-up transformers having a high turn’s ratio are generally bulky
and noisy. Therefore, the alternate option is to go for a transformer- less design. The
maximum gain of conventional boost converter is achieved at duty ratio (D) near unity,
where the diode and the output capacitor have to sustain a high current with very small
pulse width. This results in severe reverse recovery of the diode, which increases the
conduction loss and produces electromagnetic interference (EMI). This problem is
aggravated at high switching frequencies as the reverse recovery time (trr) of the device
may be larger than the time available during (1-D) interval. Moreover, a boost converter has
a maximum output to input voltage conversion ratio of. Cascaded boost converter or
quadratic boost converter can provide higher gain, but they need more passive components
and passive switches. Converter with coupled inductor can deliver high gain without
extreme duty cycle operation .Single-switch high-gain dc/dc converters using four terminal
switched cells and switched-capacitor cells possess high gain at reduced switch stress.
Conclusion:
This paper has proposed a high-boost inverter structure based on the current-fed dc/dc
converter topology. The proposed converter (CFSI) can work in both buck mode and boost
mode and exhibits improved EMI noise immunity. The high gain of the converter is obtained
due to insertion of shoot-through interval. In this paper, the development of the CFSI circuit
has been described in detail along with its steady-state characteristics. The PWM switching
scheme and the restriction on modulation index have also been described. The proposed
inverter has been compared with traditional boost-VSI topology, SBI, and ZSI to present the
advantages and disadvantages of CFSI. This paper has also presented a DSP-based closedloop control scheme meant to regulate the ac and dc bus voltages. The proposed converter
is tested on a laboratory prototype and verified.
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14PE8
Screen shots:
INPUT CURRENT AND OUTPUT CURRENT
INPUT VOLTAGE AND OUTPUT VOLTAGE
PWM control signals for the (a) positive half cycle of Vm(t), (b) negative half cycle of Vm(t),
and (c) switch node voltage waveforms of the converter
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