In this paper, a novel single-phase cascaded grid connected multilevel inverter (MLI) is proposed for feeding power to microgrid from renewable energy sources (RESs). The proposed inverter is capable of feeding power to microgrid with low total harmonic distortion (THD). The proposed inverter consists of two H bridge inverters connected in cascade, namely, upper and lower inverters. The upper inverter is fed from photovoltaic (PV) array through a DC–DC boost converter, whereas the lower inverter is fed from wind turbine (WT) coupled to permanent magnet synchronous generator (PMSG) through an uncontrolled rectifier and DC–DC boost converter. The upper inverter operates at high frequency, whereas the lower inverter operates at fundamental frequency. To extract maximum power from the WT and PV array, a sliding mode control based maximum power point tracker (MPPT) is used. The proposed inverter is connected to the single phase 230 V, 50 Hz grid, and the control algorithm is implemented in the SPARTAN 3A digital signal processor (DSP) board. The proposed inverter is simulated using matlab/simulink, and detailed experimental results are presented to show the efficacy of the proposed inverter under different environmental conditions.

References

References
1.
Carrasco
,
J. M.
,
Franquelo
,
L. G.
,
Bialasiewicz
,
J. T.
,
Galván
,
E.
,
Guisado
,
R. P.
,
Prats
,
M. A.
, and
Moreno-Alfonso
,
N.
,
2006
, “
Power-Electronic Systems for the Grid Integration of Renewable Energy Sources: A Survey
,”
IEEE Trans. Ind. Electron.
,
53
(
4
), pp.
1002
1016
.
2.
Nami
,
A.
,
Zare
,
F.
,
Ghosh
,
A.
, and
Blaabjerg
,
F.
,
2011
, “
A Hybrid Cascade Converter Topology With Series-Connected Symmetrical and Asymmetrical Diode-Clamped H-Bridge Cells
,”
IEEE Trans. Power Electron.
,
26
(
1
), pp.
51
65
.
3.
Tolbert
,
L. M.
, and
Peng
,
F. Z.
,
2000
, “
Multilevel Converters as a Utility Interface for Renewable Energy Systems
,”
IEEE Power Engineering Society Summer Meeting
, IEEE, Vol.
2
, pp. 1271–1274.
4.
Calais
,
M.
,
Agelidis
,
V. G.
, and
Meinhardt
,
M.
,
1999
, “
Multilevel Converters for Single-Phase Grid Connected Photovoltaic Systems: An Overview
,”
Sol. Energy
,
66
(
5
), pp.
325
335
.
5.
Merahi
,
F.
,
Berkouk
,
E. M.
, and
Mekhilef
,
S.
,
2014
, “
New Management Structure of Active and Reactive Power of a Large Wind Farm Based on Multilevel Converter
,”
Renewable Energy
,
68
(
1
), pp.
814
828
.
6.
Merahi
,
F.
, and
Berkouk
,
E. M.
,
2013
, “
Back-to-Back Five-Level Converters for Wind Energy Conversion System With DC-Bus Imbalance Minimization
,”
Renewable Energy
,
60
(
1
), pp.
137
149
.
7.
Guerrero-Perez
,
J.
,
De Jodar
,
E.
,
Gómez-Lázaro
,
E.
, and
Molina-Garcia
,
A.
,
2014
, “
Behavioral Modeling of Grid-Connected Photovoltaic Inverters: Development and Assessment
,”
Renewable Energy
,
68
(
1
), pp.
686
696
.
8.
Sastry
,
J.
,
Bakas
,
P.
,
Kim
,
H.
,
Wang
,
L.
, and
Marinopoulos
,
A.
,
2014
, “
Evaluation of Cascaded H-Bridge Inverter for Utility-Scale Photovoltaic Systems
,”
Renewable Energy
,
69
(
1
), pp.
208
218
.
9.
Rahim
,
N. A.
,
Selvaraj
,
J.
, and
Krismadinata
,
C.
,
2010
, “
Five-Level Inverter With Dual Reference Modulation Technique for Grid-Connected PV System
,”
Renewable Energy
,
35
(
3
), pp.
712
720
.
10.
Calais
,
M.
,
Agelidis
,
V. G.
, and
Dymond
,
M. S.
,
2001
, “
A Cascaded Inverter for Transformer Less Single-Phase Grid-Connected Photovoltaic Systems
,”
Renewable Energy
,
22
(
1
), pp.
255
262
.
11.
Testa
,
A.
,
De Caro
,
S.
,
La Torre
,
R.
, and
Scimone
,
T.
,
2012
, “
A Probabilistic Approach to Size Step-Up Transformers for Grid Connected PV Plants
,”
Renewable Energy
,
48
(
1
), pp.
42
51
.
12.
Fekete
,
K.
,
Klaic
,
Z.
, and
Majdandzic
,
L.
,
2012
, “
Expansion of the Residential Photovoltaic Systems and Its Harmonic Impact on the Distribution Grid
,”
Renewable Energy
,
43
(
1
), pp.
140
148
.
13.
Alexander
,
S. A.
, and
Thathan
,
M.
,
2014
, “
Reduction of Voltage Harmonics in Solar Photovoltaic Fed Inverter of Single Phase Stand Alone Power System
,”
ASME J. Sol. Energy Eng.
,
136
(
4
), p.
044501
.
14.
Zheng
,
H.
,
Li
,
S.
,
Challoo
,
R.
, and
Proano
,
J.
,
2014
, “
Shading and Bypass Diode Impacts to Energy Extraction of PV Arrays Under Different Converter Configurations
,”
Renewable Energy
,
68
, pp.
58
66
.
15.
Kaliamoorthy
,
M.
,
Rajasekaran
,
V.
, and
Raj
,
I. G. C.
,
2014
, “
Single-Phase Fifteen-Level Grid-Connected Inverter for Photovoltaic System With Evolutionary Programming Based MPPT Algorithm
,”
Sol. Energy
,
105
, pp.
314
329
.
16.
Sridhar
,
R.
,
Jayasankar
,
K. C.
,
Dash
,
S. S.
, and
Avasthy
,
V.
,
2013
, “
A Single Stage Photovoltaic Inverter With Common Power Factor Control and Maximum Power Point Tracking Circuit
,”
ASME J. Sol. Energy Eng.
,
136
(
2
), p.
021020
.
17.
Muñoz
,
F. J.
,
Jiménez
,
G.
,
Fuentes
,
M.
, and
Aguilar
,
J. D. E.
,
2013
, “
Power Gain and Daily Improvement Factor in Stand-Alone Photovoltaic Systems With Maximum Power Point Tracking Charge Regulators. Case of Study: South of Spain
,”
ASME J. Sol. Energy Eng.
,
135
(
4
), p.
041011
.
18.
Averbukh
,
M.
,
Ben-Galim
,
Y.
, and
Uhananov
,
A.
,
2012
, “
Development of a Quick Dynamic Response Maximum Power Point Tracking Algorithm for Off-Grid System With Adaptive Switching (On-Off) Control of DC/DC Converter
,”
ASME J. Sol. Energy Eng.
,
135
(
2
), p.
021003
.
19.
Adinolfi
,
G.
,
Femia
,
N.
,
Petrone
,
G.
,
Spagnuolo
,
G.
, and
Vitelli
,
M.
,
2010
, “
Design of DC/DC Converters for DMPPT PV Applications Based on the Concept of Energetic Efficiency
,”
ASME J. Sol. Energy Eng.
,
132
(
2
), p.
021005
.
20.
Azevedo
,
G. M. S.
,
Cavalcanti
,
M. C.
,
Oliveira
,
K. C.
,
Neves
,
F. A. S.
, and
Lins
,
Z. D.
,
2009
, “
Comparative Evaluation of Maximum Power Point Tracking Methods for Photovoltaic Systems
,”
ASME J. Sol. Energy Eng.
,
131
(
3
), p.
031006
.
21.
Radziemska
,
E.
, and
Klugmann
,
E.
,
2006
, “
Photovoltaic Maximum Power Point Varying With Illumination and Temperature
,”
ASME J. Sol. Energy Eng.
,
128
(
1
), pp.
34
39
.
22.
Venkataramanan
,
G.
,
Milkovska
,
B.
,
Gerez
,
V.
, and
Nehrir
,
H.
,
1996
, “
Variable Speed Operation of Permanent Magnet Alternator Wind Turbines Using a Single Switch Power Converter
,”
ASME J. Sol. Energy Eng.
,
118
(
4
), pp.
235
238
.
23.
Esram
,
T.
, and
Chapman
,
P. L.
,
2007
, “
Comparison of Photovoltaic Array Maximum Power Point Tracking Techniques
,”
IEEE Trans. Energy Convers.
,
22
(
2
), pp.
439
449
.
24.
Shmilovitz
,
D.
,
2005
, “
On the Control of Photovoltaic Maximum Power Point Tracker Via Output Parameters
,”
IEE Proc.- Electr. Power Appl.
,
152
(
2
), pp.
239
248
.
25.
Jain
,
S.
, and
Agarwal
,
V.
,
2004
, “
A New Algorithm for Rapid Tracking of Approximate Maximum Power Point in Photovoltaic Systems
,”
IEEE Power Electron. Lett.
,
2
(
1
), pp.
16
19
.
26.
Agelidis
,
V. G.
,
Baker
,
D. M.
,
Lawrance
,
W. B.
, and
Nayar
,
C. V.
,
1997
, “
A Multilevel PWM Inverter Topology for Photovoltaic Applications
,”
IEEE International Symposium on Industrial Electronics (ISIE’97)
, Vol.
2
, pp.
589
594
.
27.
Gerardo
,
C.
,
Guzmn
,
V.
,
Snchez
,
C.
,
Ibez
,
F.
,
Walter
,
J.
, and
Gimnez
,
M. I.
,
2006
, “
A New Simplified Multilevel Inverter Topology for DC-AC Conversion
,”
IEEE Trans. Power Electron.
,
21
(
5
), pp.
1311
1319
.
28.
Park
,
S.-J.
,
Kang
,
F.-S.
,
Lee
,
M. H.
, and
Kim
,
C.-U.
,
2003
, “
A New Single-Phase Five-Level PWM Inverter Employing a Deadbeat Control Scheme
,”
IEEE Trans. Power Electron.
,
18
(
3
), pp.
3831
3843
.
29.
Hinago
,
Y.
, and
Koizumi
,
H.
,
2010
, “
A Single-Phase Multilevel Inverter Using Switched Series/Parallel DC Voltage Sources
,”
IEEE Trans. Ind. Electron.
,
57
(
8
), pp.
2643
2650
.
30.
Rahim
,
N. A.
,
Chaniago
,
K.
, and
Selvaraj
,
J.
,
2011
, “
Single-Phase Seven-Level Grid-Connected Inverter for Photovoltaic System
,”
IEEE Trans. Ind. Electron.
,
58
(
6
), pp.
2345
2443
.
31.
Shukla
,
A.
, and
Ghosh
,
A.
,
2010
, “
Flying-Capacitor-Based Chopper Circuit for DC Capacitor Voltage Balancing in Diode-Clamped Multilevel Inverter
,”
IEEE Trans. Ind. Electron.
,
57
(
7
), pp.
2249
2261
.
32.
Sera
,
D.
,
Teodorescu
,
R.
,
Hantschel
,
J.
, and
Knoll
,
M.
,
2008
, “
Optimized Maximum Power Point Tracker for Fast Changing Environmental Conditions
,”
IEEE International Symposium on Industrial Electronics
, pp.
2401
2407
.
33.
Blaabjerg
,
F.
,
Teodorescu
,
R.
,
Liserre
,
M.
, and
Timbus
,
A. V.
,
2006
, “
Overview of Control and Grid Synchronization for Distributed Power Generation Systems
,”
IEEE Trans. Ind. Electron.
,
53
(
5
), pp.
1398
1409
.
34.
Anani
,
N.
,
Al-Kharji
,
O.
,
Ponnapalli
,
P.
,
Al-Araji
,
S.
, and
Al-Qutayri
,
M.
,
2012
, “
Synchronization of a Single-Phase Photovoltaic Generator With the Low-Voltage Utility Grid
,”
ASME J. Sol. Energy Eng.
,
134
(
1
), p.
011007
.
35.
Naderi
,
P.
,
2013
, “
Distributed Generation, Using Battery/Photovoltaic System: Modeling and Simulation With Relative Controller Design
,”
ASME J. Sol. Energy Eng.
,
135
(
2
), p.
024506
.
36.
Munoz
,
F. J.
,
Torres
,
M.
,
Munoz
,
J. V.
, and
Fuentes
,
M.
,
2013
, “
Monitoring Array Output Current and Voltage in Stand Alone Photovoltaics Systems With Pulse Width Modulated Charge Regulators
,”
ASME J. Sol. Energy Eng.
,
135
(
2
), pp.
21
28
.
37.
Henze
,
G. P.
, and
Dodier
,
R. H.
,
2003
, “
Adaptive Optimal Control of a Grid-Independent Photovoltaic System
,”
ASME J. Sol. Energy Eng.
,
125
(
1
), pp.
34
42
.
38.
Jayashri
,
R.
, and
Devi
,
R. K.
,
2009
, “
Facts Controllers for Grid Connected Wind Energy Conversion Systems
,”
ASME J. Sol. Energy Eng.
,
131
(
1
), p. 011008.
39.
Johnson
,
B.
,
Krein
,
P.
, and
Chapman
,
P.
,
2011
, “
Photovoltaic AC Module Composed of a Very Large Number of Interleaved Inverters
,”
Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
, pp.
976
981
.
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