A New Maximum Power Point Tracking Algorithm For Partial Shaded Photovoltaic Systems

In this paper, a new maximum power point tracking MPPT algorithm is proposed to track the global maximum point (GMPP) under partial shading conditions (PSC). The proposed algorithm can track the real GMPP under any PSC patterns and under any weather conditions with improving the tracking speed and reducing the PV output power oscillations at the steady state. The proposed algorithm is simple and easy to implement, because additional sensors or electrical switches are not required to identify the GMPP. The idea of the proposed method is based mainly on the scanning of the PV curve with a variable step of the duty cycle from zero to one. The scan step will be small when the operating point is near the MPP, otherwise, the scan step will be large to skip the regions that do not need to be scanned on the PV curve. Therefore, the scan time will be reduced and the MPPs are accurately detected. Furthermore, the algorithm stores only one MPP during the scanning process, stores only the data position of the greatest maximum power of the PV curve in each sample time Ts. Therefore, the execution of the embedded program in the calculator is optimized. In order to maintain the operating point at the GMPP after the scanning is finished a simple proposed sub-program will be used. In this work, a controlled Cuk DC–DC converter was used and connected to a Kyocera KC50T PV panel to verify the performance of the proposed method. Matlab/Simulink™ was used for the simulation studies.

[1]  Olivier Trescases,et al.  Multi-input single-inductor dc-dc converter for MPPT in parallel-connected photovoltaic applications , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[2]  Stephen J. Finney,et al.  A Maximum Power Point Tracking Technique for Partially Shaded Photovoltaic Systems in Microgrids , 2013, IEEE Transactions on Industrial Electronics.

[3]  M. Vitelli,et al.  Energy efficiency effective design of DC/DC converters for DMPPT PV applications , 2009, 2009 35th Annual Conference of IEEE Industrial Electronics.

[4]  Doron Shmilovitz,et al.  Distributed Maximum Power Point Tracking in Photovoltaic Systems—Emerging Architectures and Control Methods , 2012 .

[5]  Ronnie Belmans,et al.  Partial shadowing of photovoltaic arrays with different system configurations: literature review and field test results , 2003 .

[6]  F. Chenlo,et al.  Experimental study of mismatch and shading effects in the I-V characteristic of a photovoltaic module , 2006 .

[7]  Toshihisa Shimizu,et al.  Generation control circuit for photovoltaic modules , 2001 .

[8]  Zhen Zhang,et al.  Characteristic output of PV systems under partial shading or mismatch conditions , 2015 .

[9]  E. Koutroulis,et al.  A New Technique for Tracking the Global Maximum Power Point of PV Arrays Operating Under Partial-Shading Conditions , 2012, IEEE Journal of Photovoltaics.

[10]  U. Jahn,et al.  Performance of 170 grid connected PV plants in Northern Germany—Analysis of yields and optimization potentials , 1997 .

[11]  Aissa Chouder,et al.  Artificial bee colony based algorithm for maximum power point tracking (MPPT) for PV systems operating under partial shaded conditions , 2015, Appl. Soft Comput..

[12]  K. Sakuta,et al.  Extended performance analysis of 70 PV systems in Japanese field test program , 1997, Conference Record of the Twenty Sixth IEEE Photovoltaic Specialists Conference - 1997.

[13]  Xinbo Ruan,et al.  High-Accuracy and Fast-Speed MPPT Methods for PV String Under Partially Shaded Conditions , 2016, IEEE Transactions on Industrial Electronics.

[14]  Vivek Agarwal,et al.  Maximum Power Extraction From a Partially Shaded PV Array Using Shunt-Series Compensation , 2014, IEEE Journal of Photovoltaics.

[15]  Mutlu Boztepe,et al.  Voltage based power compensation system for photovoltaic generation system under partially shaded insolation conditions , 2008 .