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

yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Mains electricity wikipedia, lookup

History of electric power transmission wikipedia, lookup

Power engineering wikipedia, lookup

Buck converter wikipedia, lookup

Switched-mode power supply wikipedia, lookup

Opto-isolator wikipedia, lookup

Alternating current wikipedia, lookup

Metadyne wikipedia, lookup

Voltage optimisation wikipedia, lookup

Voltage regulator wikipedia, lookup

Schmitt trigger wikipedia, lookup

Resistive opto-isolator wikipedia, lookup

Rectifier wikipedia, lookup

Stray voltage wikipedia, lookup

Surge protector wikipedia, lookup

Distribution management system wikipedia, lookup

Current source wikipedia, lookup

Pulse-width modulation wikipedia, lookup

Variable-frequency drive wikipedia, lookup

Integrating ADC wikipedia, lookup

Islanding wikipedia, lookup

Power inverter wikipedia, lookup

Electrical substation wikipedia, lookup

Three-phase electric power wikipedia, lookup

Immunity-aware programming wikipedia, lookup

Solar micro-inverter wikipedia, lookup

Amtrak's 25 Hz traction power system wikipedia, lookup

Control system wikipedia, lookup

Analog-to-digital converter wikipedia, lookup

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
Power Electronics
Publish Year
2014 Page(s): 4680 - 4690
Software Used
Developed By
Wine Yard Technologies, Hyderabad
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.
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.
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.
Screen shots:
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