Open Access Open Access  Restricted Access Subscription or Fee Access

Diminution of THD Level for A Tansformerless Grid-Connected PV Using Multi-Level Hybrid Inverter

G. Besliya Angel, J. KrishnaSree

Abstract


Renewable energy is a recent trend used for generating the electricity due to its availability, High efficient and cheaper etc. Power electronics devices have become more advantageous in last three decades for grid utility. Multi-Level Inverter (MLI) is also used in grid applications to reduce the Harmonics caused by non-linear load, and it is necessary to diminish the Harmonics which is an important power quality problem in grid utility. This paper presents a Single-Phase Transformless Grid-connected PV system with Hybrid Multi-Level inverter with different DC source to diminish the Harmonics. This inverter has 2 asymmetrical Cascade Full Bridge whereas one is supplied by PV system and other is supplied by flying capacitor. Thus this inverter’s output reduces harmonics and Electromagnetic Interferences by increasing its stepped output levels. The Phase Opposite Disposition- PWM (POD-PWM) switching strategy is employed to regulate the flying capacitor, and improve efficiency by reducing the THD (Total Harmonics Distortion) level. In this work, the Grid connected PV system with Multi-Level inverter is obtained by interconnecting the Hybrid Multi-level inverter, POD-PWM with solar system and load. Simulation using MATLAB/Simulink software confirms the feasibility and good performance of the proposed inverter and the PWM strategy.

Finally this work reduced the THD level to 5% with ± tolerance as per the IEEE standard by using grid-connected PV system with Hybrid Multi-Level inverter and POD-PWM


Keywords


Hybrid Multi-Level Inverter, Phase Opposite Disposition PWM, THD.

Full Text:

PDF

References


G. Buticchi, L. Consolini, and E. Lorenzani, “Active filter for the removal of the dc current component for single-phase power lines,” IEEE Trans.Ind. Electron, vol. 60, no. 10, pp. 4403–4414, Oct. 2013.

G. Buticchi and E. Lorenzani, “Detection method of the dc bias in distribution power transformers,” IEEE Trans. Ind. Electron., vol. 60, no. 8, pp. 3539–3549, Aug. 2013.

O. Lopez, F. Freijedo, A. Yepes, P. Fernandez-Comesaa, J. Malvar, R. Teodorescu, and J. Doval-Gandoy, “Eliminating ground current in a Transformerless photovoltaic application,” IEEE Trans. Energy Convers., vol. 25, no. 1, pp. 140–147, Mar. 2010.

H. Xiao and S. Xie, “Leakage current analytical model and application in single-phase Transformerless photovoltaic grid-connected inverter,” IEEE Trans. Electromagn. Compat, vol. 52, no. 4, pp. 902–913, Nov. 2010.

Rodriguez J, Lai J S, Peng FZ, Multi-level inverters: a survey of topologies, controls, and applications. IEEE Transactions on Industrial Electronics, vol.49, no.4, pp. 724–738, 2002.

T. Kerekes, R. Teodorescu, P. Rodridguez, G. Vazquez, and E. Aldabas, “A new high-efficiency single-phase transformerless PV inverter topology,” IEEE Trans. Ind. Electron., vol. 58, no. 1, pp. 184–191, Jan. 2011.

S. Kouro, M. Malinowski, K. Gopakumar, J. Pou, L. Franquelo, B. Wu, J. Rodriguez, M.P. Andrez, and J. Leon, “Recent advances and industrial Applications of multilevel converters,” IEEE Trans. Ind. Electron., vol. 57,no. 8, pp. 2553–2580, Aug. 2010.

Y. Kashihara and J. Itoh, “The performance of the multilevel converter topologies for PV inverter,” in Proc. CIPS, pp. 1–6, Mar. 2012.

S. Vazquez, J. Leon, J. Carrasco, L. Franquelo, E. Galvan, M. Reyes, J. Sanchez, and E. Dominguez, “Analysis of the power balance in the cells of a multilevel cascaded H-bridge converter,” IEEE Trans. Ind. Electron. vol. 57, no. 7, pp. 2287–2296, Jul. 2010.

N. Rahim and J. Selvaraj, “Multistring five-level inverter with novel PWM control scheme for PV application,” IEEE Trans. Ind. Electron., vol. 57,no. 6, pp. 2111–2123, Jun. 2010.

W. Yu, J.-S. Lai, H. Qian, and C. Hutchens, “High-efficiency MOSFET inverter with h6-type configuration for photovoltaic non-isolated ac-module applications,” IEEE Trans. Power Electron., vol. 26, no. 4, pp. 1253–1260, Apr. 2011.

Y. Noge and J. Itoh, “Multi-level inverter with H-bridge clamp circuit for single-phase three-wire grid connection suitable for super-junction–SiC MOSFET,” in Proc. IPEMC, Harbin, China, Jun. 2012, vol. 2, pp. 88–93.

C. Cecati, F. Ciancetta, and P. Siano, “A multilevel inverter for photovoltaic systems with fuzzy logic control,” IEEE Trans. Ind. Electron, vol. 57, no. 12, pp. 4115–4125, Dec. 2010.

I. Abdalla, J. Corda, and L. Zhang, “Multilevel dc-link inverter and control algorithm to overcome the PV partial shading,” IEEE Trans. Power Electron., vol. 28, no. 1, pp. 14–18, Jan. 2013.

A. Bidram, A. Davoudi, and R. Balog, “Control and circuit techniques to mitigate partial shading effects in photovoltaic arrays,” IEEE J. Photovoltaics, vol. 2, no. 4, pp. 532–546, Oct. 2012.

G. Brando, A. Dannier, A. Del Pizzo, and R. Rizzo, “A high performance control technique of power electronic transformers in medium voltage grid-connected PV plants,” in Proc. ICEM, Rome, Italy, vol. 2,pp. 1–6, Sep. 2010.

S. Essakiappan, H. Krishnamoorthy, P. Enjeti, R. Balog, and S. Ahmed, “Independent control of series connected utility scale multilevel photovoltaic inverters,” in Proc. IEEE ECCE, Raleigh, NC, USA, Sep. 2012, pp. 1760–1766.

C. Townsend, T. Summers, and R. Betz, “Control and modulation scheme for a cascaded H-bridge multi-level converter in large scale photovoltaic systems,” in Proc. IEEE ECCE, Raleigh, NC, USA, Sep. 2012,pp. 3707–3714.

J. Chavarria, D. Biel, F. Guinjoan, C. Meza, and J. Negroni, “Energy balance control of PV cascaded multilevel grid-connected inverters under level-shifted and phase-shifted PWMS,” IEEE Trans. Ind. Electron., vol. 60, no. 1, pp. 98–111, Jan. 2013.

B. GU, J. Dominic, J.-S. Lai, C.-L. Chen, T. LaBella, and B. Chen, “High reliability and efficiency Single-phase Transformerless inverter for grid connected photovoltaic systems,” IEEE Trans. Power Electron., vol. 28, no. 5, pp. 2235–2245, May 2013.

G. Buticchi, E. Lorenzani, and G. Franceschini, “A five-level single-phase grid-connected converter for renewable distributed systems,” IEEE Trans.Ind. Electron, vol. 60, no. 3, pp. 906–918, Mar. 2013.

F. Filho, L. Tolbert, Y. Cao, and B. Ozpineci, “Real-time selective harmonic minimization for multilevel inverters connected to solar panels using artificial neural network angle generation,” IEEE Trans. Ind. Appl., vol. 47, no. 5, pp. 2117–2124, Sep./Oct. 2011.

S. Lu, S. Mariethoz, and K. Corzine, “Asymmetrical cascade multilevel converters with non-integer or dynamically changing dc voltage ratios: Concepts and modulation techniques,” IEEE Trans. Ind. Electron., vol. 57, no. 7, pp. 2411–2418, Jul. 2010.

A. Varschavsky, J. Dixon, M. Rotella, and L.Moran, “Cascaded nine-level inverter for hybrid-series active power filter, using industrial controller, ”IEEE Trans. Ind. Electron., vol. 57, no. 8, pp. 2761–2767, Aug. 2010.

N. Rahim, K. Chaniago, and J. Selvaraj, “Single-phase seven-level grid connected inverter for photovoltaic system,” IEEE Trans. Ind. Electron, vol. 58, no. 6, pp. 2435–2443, Jun. 2011.

Giampaolo Buticchi, Davide Barater, Emilio Lorenzani, Carlo Concari, and Giovanni Franceschini, “A Nine-Level Grid-connected converter topology for Single-phase Transformerless PV systems,” IEEE Trans.Ind. Electron, vol.61, no.8, August 2014.




DOI: http://dx.doi.org/10.36039/AA032015001.

Refbacks

  • There are currently no refbacks.


Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.