© The Institution of Engineering and Technology
This study presents a new voltage control algorithm for multilevel inverters which are used to connect the distributed generation (DG) sources (like photovoltaic cells) to the network, which is called the voltage look-up table method (VLUTM). This method can build up an almost sinusoidal voltage at the inverter output with the least number of switching in the power circuit, and the best possible harmonic spectrum without the need to any big filtering. On the other hand, in some specific applications where the DG has been set up beside a non-linear load, VLUTM can make a reference voltage based on the reference current to take a desired current form the DG. This way the DG can compensate the major low-order load current harmonics and improve the source side current THD greatly. Decreasing the switching frequency as much as possible, which leads to better efficiency and less EMI problems, the capability of implementation both in single phase and three phase circuitry, and the very simple and desired current control, would be the major benefits of this method. The simulation results taken from Matlab/Simulink and the experimental results on a 1 kVA experimental prototype are presented to evaluate the performance of this method.
References
-
-
1)
-
18. Chen, Z., Luo, Y., Chen, M.: ‘Control and performance of a cascaded shunt active power filter for aircraft electric power system’, IEEE Trans. Ind. Electron., 2012, 59, (9), pp. 3614–3623 (doi: 10.1109/TIE.2011.2166231).
-
2)
-
T. Kerekes ,
R. Teodorescu ,
P. Rodríguez ,
G. Vázquez ,
E. Aldabas
.
A new high-efficiency single-phase transformerless PV inverter topology.
IEEE Trans. Ind. Electron.
,
1 ,
184 -
191
-
3)
-
27. IEEE Std 519: ‘IEEE Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems’, 1992.
-
4)
-
12. Zhang, L., Sun, K., Feng, L.L., Wu, H.F., Xing, Y.: ‘A family of neutral point clamped full-bridge topologies for transformerless photovoltaic grid-tied inverters’, IEEE Trans. Power Electron., 2013, 28, (2), pp. 730–739 (doi: 10.1109/TPEL.2012.2205406).
-
5)
-
11. Gupta, K.K., Jain, S.: ‘Topology for multilevel inverters to attain maximum number of levels from given DC sources’, IET Power Electron., 2012, 5, (4), pp. 435–446 (doi: 10.1049/iet-pel.2011.0178).
-
6)
-
H.F. Xiao ,
S.J. Xie ,
C. Yang ,
R.H. Huang
.
An optimized transformerless photovoltaic grid-connected inverter.
IEEE Trans. Ind. Electron.
,
5 ,
1887 -
1895
-
7)
-
17. Huafeng, X., Shaojun, X.: ‘Transformerless split-inductor neutral point clamped three-level PV grid-connected inverter’, IEEE Trans. Power Electron., 2012, 27, (4), pp. 1799–1808 (doi: 10.1109/TPEL.2011.2164940).
-
8)
-
6. Gu, B., Dominic, J., Lai, J.-S., Chen, C.-L., LaBella, T., Chen, B.F.: ‘High reliability and efficiency single-phase transformerless inverter for grid-connected photovoltaic systems’, IEEE Trans. Power Electron., 2013, 28, (5), pp. 2235–2245 (doi: 10.1109/TPEL.2012.2214237).
-
9)
-
25. Wu, W., He, Y., Tang, T., Blaabjerg, F.: ‘A new design method for the passive damped LCL and LLCL filter-based single-phase grid-tied inverter’, IEEE Trans. Ind. Electron., 2013, 60, (10), pp. 4339–4350 (doi: 10.1109/TIE.2012.2217725).
-
10)
-
P. Flores ,
J. Dixon ,
M. Ortuzar ,
R. Carmi ,
P. Barriuso ,
L. Moran
.
Static var compensator and active power filter with power injection capability, using 27-level inverters and photovoltaic cells.
IEEE Trans. Ind. Electron.
,
1 ,
130 -
138
-
11)
-
7. Gu, Y.J., Li, W.H., Zhao, Y., Yang, B., Li, C.S., He, X.N.: ‘Transformerless inverter with virtual DC bus concept for cost-effective grid-connected PV power systems’, IEEE Trans. Power Electron., 2013, 28, (2), pp. 793–805 (doi: 10.1109/TPEL.2012.2203612).
-
12)
-
27. Surendra Babu, N.N.V., Fernandes, B.G.: ‘Cascaded two-level inverter-based multilevel static VAr compensator using 12-sided polygonal voltage space vector modulation’, IET Power Electron., 2012, 5, (8), pp. 1500–1509 (doi: 10.1049/iet-pel.2012.0120).
-
13)
-
22. Nijhawan, P., Bhatia, R.S., Jain, D.K.: ‘Improved performance of multilevel inverter-based distribution static synchronous compensator with induction furnace load’, IET Power Electron., 2013, 6, (9), pp. 1939–1947 (doi: 10.1049/iet-pel.2013.0029).
-
14)
-
M. Armstrong ,
D.J. Atkinson ,
C. Mark Johnson
.
Auto-calibrating DC link current sensing technique for transformerless, grid connected, H-bridge inverter systems.
IEEE Trans. Power Electron.
,
5 ,
1385 -
1393
-
15)
-
R. Gonzalez ,
E. Gubia ,
J. Lopez ,
L. Marroyo
.
Transformerless single-phase multilevel-based photovoltaic inverter.
IEEE Trans. Ind. Electron.
,
7 ,
2694 -
2702
-
16)
-
10. Xiao, H.F., Xie, S.J.: ‘Leakage current analytical model and application in single-phase transformerless photovoltaic grid-connected inverter’, IEEE Trans. Electromagn. Compat., 2010, 52, (4), pp. 902–913 (doi: 10.1109/TEMC.2010.2064169).
-
17)
-
28. Pereda, J., Dixon, J.: ‘23-level inverter for electric vehicles using a single battery pack and series active filters’, IEEE Trans. Veh. Technol., 2012, 61, (3), pp. 1043–1051 (doi: 10.1109/TVT.2012.2186599).
-
18)
-
15. Liserre, M., Teodorescu, R., Klumpner, C., Sumner, M.: ‘Evaluation of three-phase transformerless photovoltaic inverter topologies’, IEEE Trans. Power Electron., 2009, 24, (9), pp. 2202–2211 (doi: 10.1109/TPEL.2009.2020800).
-
19)
-
9. Massoud, A.M., Finney, S.J., Cruden, A.J., William, B.W.: ‘Three-phase, three-wire, five-level cascaded shunt active filter for power conditioning, using two different space vector modulation techniques’, IEEE Trans. Power Deliv., 2007, 22, (4), pp. 2349–2361 (doi: 10.1109/TPWRD.2007.905447).
-
20)
-
11. Bradaschia, F., Cavalcanti, M.C., Ferraz, P.E.P., Neves, F.A.Z., dos Santos, Jr.E.C., da Silva, J.H.G.M.: ‘Modulation for three-phase transformerless Z-source inverter to reduce leakage currents in photovoltaic systems’, IEEE Trans. Ind. Electron., 2011, 58, (12), pp. 5385–5395 (doi: 10.1109/TIE.2011.2116762).
-
21)
-
5. Patrao, I., Figueres, E., González-Espín, F., Garcerá, G.: ‘Transformerless topologies for grid-connected single-phase photovoltaic inverters’, Renew. Sust. Energy Rev., 2011, 15, (7), pp. 3423–3431 (doi: 10.1016/j.rser.2011.03.034).
-
22)
-
2. Yang, B., Li, W., Gu, Y., Cui, W., He, X.: ‘Improved transformerless inverter with common mode leakage current elimination for a photovoltaic grid-connected power system’, IEEE Trans. Power Electron., 2012, 27, (2), pp. 752–762 (doi: 10.1109/TPEL.2011.2160359).
-
23)
-
13. Araújo, S.V., Zacharias, P., Mallwitz, R.: ‘Highly efficient single-phase transformerless inverters for grid-connected photovoltaic systems’, IEEE Trans. Ind. Electron., 2010, 57, (9), pp. 3118–3128 (doi: 10.1109/TIE.2009.2037654).
-
24)
-
A. Varschavsky ,
J. Dixon ,
M. Rotella ,
L. Moran
.
Cascaded nine-level inverter for hybrid series active power filter using industrial controller.
IEEE Trans. Ind. Electron.
,
8 ,
2761 -
2767
-
25)
-
26. Rashid, M.H.: ‘Power electronics handbook’ (Academic Press is an imprint of Elsevier, 2007, 2nd edn.) pp. 32–34.
-
26)
-
18. Shalchi Alishah, R., Nazarpour, D., Hosseini, S.H., Sabahi, M.: ‘New hybrid structure for multilevel inverter with fewer number of components for high-voltage levels’, IET Power Electron., 2014, 7, (1), pp. 96–104 (doi: 10.1049/iet-pel.2013.0156).
-
27)
-
R. Gonzalez ,
J. Lopez ,
P. Sanchis ,
L. Parroyo
.
Transformerless inverter for single-phase photovoltaic systems.
IEEE Trans. Power Electron.
,
2 ,
693 -
697
http://iet.metastore.ingenta.com/content/journals/10.1049/iet-pel.2013.0490
Related content
content/journals/10.1049/iet-pel.2013.0490
pub_keyword,iet_inspecKeyword,pub_concept
6
6