ABSTRACT:
This paper presents a
new E-Type module for asymmetrical multilevel inverters with reduced
components. Each module produces 13 levels with four unequal DC sources and 10
switches. The design of the proposed module makes some preferable features with
a better quality than similar modules such as the low number of semiconductors
and DC sources and low switching frequency. Also, this module is able to create
a negative level without any additional circuit such as an H-bridge which
causes reduction of voltage stress on switches. Cascade connection of the
proposed structure leads to a modular topology with more levels and higher
voltages. Selective harmonics elimination pulse width modulation (SHE-PWM)
scheme is used to achieve high quality output voltage with lower harmonics.
MATLAB simulations and practical results are presented to validate the proposed
module good performance. Module output voltage satisfies harmonics standard
(IEEE519) without any filter in output.
KEYWORDS:
1.
Asymmetric
2.
Components
3.
E-Type
4.
Multilevel
inverter
5.
Power
electronics
6.
Selective
harmonics elimination
SOFTWARE:
MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig.
1 Proposed E-Type module of multilevel inverter (a) Circuit topology
EXPECTED SIMULATION RESULTS:
Fig.2
Output voltage and FFT analysis of proposed multilevel
CONCLUSION:
This paper presented a new multilevel
inverter topology named as Envelope Type (E-Type) module which can generate 13
levels with reduced components. It can be used in high voltage high power
applications with unequal DC sources. As E-Type module can be easily
modularized, it can be used in cascade arrangements to form high voltage
outputs with low stress on semiconductors and lowering the number of devices.
Modular connection of these modules leads to achieve more voltage levels with
different possible paths. It causes an improvement in the reliability of the
modular inverter which enables it to use different paths in case of malfunction
for a switch or a driver. The main advantage of proposed module is its ability
to generate both positive and negative output voltage without any H-bridge
circuit at the output of the inverter. THDv% is obtained 3.46% and 4.54% in
simulation and experimental results, respectively that satisfy harmonics
standard (IEEE519). Also module is tested in three frequency and under different
resistive – inductive loads which results shows good performance.
REFERENCES:
[1] R. Feldman, M. Tomasini, E. Amankwah, J.C. Clare, P.W.
Wheeler, D.R. Trainer, R.S. Whitehouse, "A Hybrid Modular Multilevel
Voltage Source Converter for HVDC Power Transmission," IEEE Trans. Ind.
Appl., vol.49, no.4, pp.1577–1588, July-Aug. 2013.
[2] M. Odavic, V. Biagini, M. Sumner, P. Zanchetta, M. Degano,
"Low Carrier–Fundamental Frequency Ratio PWM for Multilevel Active Shunt
Power Filters for Aerospace Applications," IEEE Trans. Ind. Appl.,
vol.49, no.1, pp.159–167, Jan.-Feb. 2013.
[3] Liming Liu, Hui Li,
Seon-Hwan Hwang, Jang-Mok Kim, "An Energy-Efficient Motor Drive With
Autonomous Power Regenerative Control System Based on Cascaded Multilevel
Inverters and Segmented Energy Storage," IEEE Trans. Ind. Appl.,
vol.49, no.1, pp.178–188, Jan.-Feb. 2013.
[4] Yushan Liu, Baoming Ge, H. Abu-Rub, F.Z. Peng, "An
Effective Control Method for Quasi-Z-Source Cascade Multilevel Inverter-Based
Grid-Tie Single-Phase Photovoltaic Power System," IEEE Trans. Ind.
Inform., vol.10, no.1, pp.399–407, Feb. 2014.
[5] Jun Mei, Bailu Xiao, Ke
Shen, L.M. Tolbert, Jian Yong Zheng, "Modular Multilevel Inverter with New
Modulation Method and Its Application to Photovoltaic Grid-Connected
Generator," IEEE Trans. on Power Electron., vol.28, no.11,
pp.5063–5073, Nov. 2013.
