Comparison of MPPT strategies applied in three-phase photovoltaic inverters during harmonic current compensation

The main objective of a photovoltaic (PV) inverter is to inject the PV power into the ac-grid. Generally, due to variations in solar irradiance, inverters operate bellow their rated current. Therefore, this current margin can be used to ancillary services, such as harmonic current compensation. However, it is necessary to evaluate the effects of the harmonic current compensation in the efficiency of the algorithms of maximum power point tracking (MPPT). In this context, this work compares, based on the European Standard, the instantaneous and dynamic efficiency of four MPPT algorithms used in photovoltaic systems: perturb and observe, dP — perturb and observe, modified perturb and observe and incremental conductance. The instantaneous power theory (IPT) is used to detect the harmonic current. Simulation results show the instantaneous and dynamic efficiency of MPPT algorithms during rapidly irradiance changes and harmonic compensation. According to the results, it can be concluded that the proposed multifunctional inverter has a slightly impact in the efficiency of the maximum power point algorithms.

[1]  Heverton A. Pereira,et al.  Adaptive saturation scheme for a multifunctional single-phase photovoltaic inverter , 2014, 2014 11th IEEE/IAS International Conference on Industry Applications.

[2]  H. Häberlin,et al.  New Procedure for Measuring Dynamic MPP-Tracking Efficiency at Grid-Connected PV Inverters , 2009 .

[3]  B. Lehman,et al.  Adaptive saturation scheme to limit the capacity of a shunt active power filter , 2005, Proceedings of 2005 IEEE Conference on Control Applications, 2005. CCA 2005..

[4]  Pallab Midya,et al.  Dynamic maximum power point tracker for photovoltaic applications , 1996, PESC Record. 27th Annual IEEE Power Electronics Specialists Conference.

[5]  Hirofumi Akagi,et al.  Shunt Active Filters , 2017 .

[6]  Juan C. Vasquez,et al.  Selective Harmonic-Compensation Control for Single-Phase Active Power Filter With High Harmonic Rejection , 2009, IEEE Transactions on Industrial Electronics.

[7]  Tsutomu Hoshino,et al.  Maximum photovoltaic power tracking: an algorithm for rapidly changing atmospheric conditions , 1995 .

[8]  Hirofumi Akagi,et al.  Instantaneous power theory and applications to power conditioning , 2007 .

[9]  Hans-Peter Nee,et al.  Model-based current control of AC machines using the internal model control method , 1995 .

[10]  F. Blaabjerg,et al.  High Performance Current Controller for Selective Harmonic Compensation in Active Power Filters , 2007, IEEE Transactions on Power Electronics.

[11]  Francisco D. Freijedo,et al.  Analysis and Design of Resonant Current Controllers for Voltage-Source Converters by Means of Nyquist Diagrams and Sensitivity Function , 2011, IEEE Transactions on Industrial Electronics.

[12]  P.L. Chapman,et al.  Comparison of Photovoltaic Array Maximum Power Point Tracking Techniques , 2007, IEEE Transactions on Energy Conversion.

[13]  Parimala,et al.  Harmonic Reduction Using Shunt Active Power Filter With Pi Controller , 2014 .

[14]  F. Blaabjerg,et al.  Improved MPPT method for rapidly changing environmental conditions , 2006, 2006 IEEE International Symposium on Industrial Electronics.