A branch and bound algorithm for high-granularity PV simulations with power limited SubMICs

Differential power processing (DPP) architectures employ low power rated dc-dc converters to mitigate, without insertion losses, mismatches in series strings of photovoltaic (PV) cells. This paper presents tools for simulation of PV systems based on the isolated-port submodule integrated converter (subMIC) DPP architecture. While the ideal operation with full power rated subMICs is relatively easy to solve using a combination of numerical and analytical methods, the solution with partial power rated (current limited) subMICs is more challenging. A heuristic branch and bound algorithm is proposed as an effective method to deal with nonlinearities introduced by current limited subMICs. The approach is well suited for high-granularity simulations of large PV systems over long periods of time, as illustrated by experimental and simulations results.

[1]  Dragan Maksimovic,et al.  Performance of Mismatched PV Systems With Submodule Integrated Converters , 2014, IEEE Journal of Photovoltaics.

[2]  Dragan Maksimovic,et al.  Nonlinear control design for the photovoltaic isolated-port architecture with submodule integrated converters , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[3]  R. W. Erickson,et al.  Characterization of Power Optimizer Potential to Increase Energy Capture in Photovoltaic Systems Operating Under Nonuniform Conditions , 2013, IEEE Transactions on Power Electronics.

[4]  P. T. Krein,et al.  Differential Power Processing for Increased Energy Production and Reliability of Photovoltaic Systems , 2013, IEEE Transactions on Power Electronics.

[5]  D. Maksimovic,et al.  Architectures and Control of Submodule Integrated DC–DC Converters for Photovoltaic Applications , 2013, IEEE Transactions on Power Electronics.

[6]  M. D. Seeman,et al.  Resonant Switched-Capacitor Converters for Sub-module Distributed Photovoltaic Power Management , 2013, IEEE Transactions on Power Electronics.

[7]  G.R. Walker,et al.  Cascaded DC-DC converter connection of photovoltaic modules , 2004, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[8]  Massimo Vitelli,et al.  Distributed maximum power point tracking of photovoltaic arrays: Novel approach and system analysis , 2008, IEEE Transactions on Industrial Electronics.

[9]  Dragan Maksimovic,et al.  A cell-level photovoltaic model for high-granularity simulations , 2013, 2013 15th European Conference on Power Electronics and Applications (EPE).

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

[11]  O. Trescases,et al.  A General Approach for Quantifying the Benefit of Distributed Power Electronics for Fine Grained MPPT in Photovoltaic Applications Using 3-D Modeling , 2012, IEEE Transactions on Power Electronics.

[12]  A. Land,et al.  An Automatic Method for Solving Discrete Programming Problems , 1960, 50 Years of Integer Programming.

[13]  A. Bulawka,et al.  The AC photovoltaic module concept , 1997, IECEC-97 Proceedings of the Thirty-Second Intersociety Energy Conversion Engineering Conference (Cat. No.97CH6203).