Three-Level Grid-Connected Inverter Based on Voltage-Oriented Control in Photovoltaic Generation Systems

Abstract:

The paper propose a new control of a three-phase three-level neutral-point-clamped (NPC) pulse width modulated (PWM) inverter in photovoltaic generation systems. The control scheme is mainly based on voltage-oriented control (VOC) with an improved maximum power point (MPP) tracking (MPPT). A cascaded control structure with an outer dc link voltage control loop and an inner current control loop is used. The currents are controlled in a synchronous dq reference frame using a decoupled feedback control. Furthermore, in order to achieve a unity power factor, the q-axis current reference is set to zero. The experimental results have proven an excellent performance and verified the validity of proposed system.

• Periodical: Advanced Materials Research (Volumes 765-767)
• Pages: 2494-2497
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.765-767.2494
• Online since: September 2013
• Authors: Fang Ping Zhao, Yong Yang
• Keywords: MPPT, Three-Level Neutral-Point-Clamped, Voltage-Oriented Control

References

[1] J. M Carrasco, L. G Franquelo, J. T Bialasiewicz, Power - electronic systems for the grid integration of renewable energy sources : a survey, IEEE Trans Ind Electron, vol. 53, no. 4, p.1002–1016, (2006).

DOI: 10.1109/tie.2006.878356

[2] F Blaabjerg, R Teodorescu, M Liserre, V Timbus, Overview of control and grid synchronization for distributed power generation systems, IEEE Trans Ind Electron, vol. 53, no. 5, p.1398–1409, (2006).

DOI: 10.1109/tie.2006.881997

[3] T Esram, P. L Chapman, Comparison of photovoltaic array maximum power point tracking techniques, IEEE Trans Energy Convers, vol. 22, no. 2, p.434–449, (2007).

DOI: 10.1109/tec.2006.874230

[4] J Enslin, M Wolf, D Snyman, W Sweigers, Integrated photovoltaic maximum power point tracking converter, IEEE Trans Ind Electron, vol. 44, no. 6, p.769–773, (1997).

DOI: 10.1109/41.649937

[5] F Liu, S Duan, B Liu, Y Kang, A variable step size INC MPPT method for PV systems, IEEE Trans Ind Electron, vol. 55, no. 7, p.2622–2628, (2008).

DOI: 10.1109/tie.2008.920550

[6] W Libo, Z Zhengming, L Jianzheng , A single-stage three-phase grid-connected photovoltaic system with modified MPPT method and reactive power compensation, IEEE Trans Energy Convers, vol. 22, no. 4, p.881–886, (2007).

DOI: 10.1109/tec.2007.895461

[7] M Malinowski, S Stynski, W Kolomyjski, M, P Kazmierkowski, Control of three-level PWM converter applied to variable-speed-type turbines, IEEE Trans Ind Electron, vol. 56, no. 1, p.69–77, (2009).

DOI: 10.1109/tie.2008.927245