A novel global maximum power point tracking strategy (GMPPT) based on optimal current control for photovoltaic systems adaptive to variable environmental and partial shading conditions. (1st March 2017)

• Record Type: Journal Article
• Authors: Zhao, Jian; Zhou, Xuesong; Gao, Zhiqiang; Ma, Youjie; Qin, Zhenwei
• Is Part Of: Solar energy. Volume 144(2017)
• Page Start: 767
• Page End: 779
• Publication Date: 2017-03-01
• Subjects: PV photovoltaic -- GMPPT global maximum power point tracking -- PS partial shading -- GMPP global maximum power point -- P&O perturbation and observation -- HC hill climbing -- INC incremental conductance -- NN neural network -- MP maximum power -- MPPT maximum power point tracking -- MPP maximum power point -- P output power of solar arrays (in W) -- I output current of solar cell (in A) -- V output voltage of solar cell (in V) -- DC direct current -- Vpmax voltage at GMPP -- Ipmax output current at GMPP -- LMPP local maximum power point -- Rs series resistor (in Ω) -- Rsh parallel resistor (in Ω) -- I0 reverse saturation current of diode (in A) -- Iph photocurrent (in A) -- n dimensionless junction material factor -- q electron charge (1.602 × 10−19 in Coulombs) -- k Boltzmann's constant (1.38 × 10−23 in Joules per Kelvin) -- Ti solar cells' temperature of the ith-solar cell (in °C) -- Isci short circuit current at standard condition of the ith-solar cell (in A) -- Imi current at MPP under standard condition of the ith-solar cell (in A) -- Voci open circuit voltage under standard condition of the ith-solar cell (in V) -- Vmi voltage at MPP of the ith-solar cell under standard condition (in V) -- Si solar irradiance of the ith-solar cell (in Watt per square meters) -- Isci′ short circuit current under nonstandard condition of the ith-solar cell (in A) -- Voci′ open circuit voltage under nonstandard condition of the ith-solar cell (in V) -- Imi′ open circuit voltage under nonstandard condition of the ith-solar cell (in A) -- Vmi′ voltage at MPP under nonstandard condition of the ith-solar cell (in V) -- Tref solar cells' temperature under standard condition (in °C) -- Sref solar irradiance under standard condition (in watt per square meter) -- Vsys output voltage of PV system -- Isys output current of PV system -- Psys output power of PV system -- Tm temperature of the mth-solar cell -- Sm solar irradiance of the mth-solar cell -- PSO particle swarm optimization -- Ij ith minimum values of f(I) -- Plpmaxj output power of PV system at LMPP corresponding to Ij -- Vlpmaxj output voltage of PV system at LMPP corresponding to Ij -- Tair environmental temperature around solar cell; Photovoltaic generation systems -- Global maximum power point tracking -- Variable environmental and partial shading conditions -- Optimal current control; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2017.02.017
• Languages: English
• ISSNs: 0038-092X

Abstract

Graphical abstract: Highlights: A novel GMPPT strategy based optimal current control for PV system is proposed. The indirect relationship between solar irradiance ( Si ), cell's temperature ( Ti ) and operating current at GMPP ( Ipmax ) has been found out. The characteristics of Pmax (output power at MPP)- S - T and Ipmax - S - T are thoroughly analyzed. The proposed method has adequate under partial shading conditions. Abstract: From the engineering cybernetics perspective, determining the output current of a solar cell corresponding to the global maximum power point (GMPP) under uniform variable environmental and partial shading (PS) conditions is essential for tracking the maximum power point. However, conventional methods could not effectively achieve this goal, and approaches for utilizing this information do not exist, including the output voltage or current and duty cycle at GMPP, in the control process. This paper describes a novel algorithm for global maximum power point tracking (GMPPT) control in parameter optimization corresponding to variable environmental and PS conditions. In the proposed method, a definable nonlinear relation has been found between variable environmental parameters and the output current of solar arrays at every maximum power point. Additionally, this research gives the mathematical expression for it. Then, GMPPT control rules are created based on the findings from the nonlinear relation that can respond at high speeds to variations in irradiation and temperature of each solar cell and even at partial shading conditions. Therefore, MATLAB®/Simulink® numerical simulations are presented to illustrate that this control algorithm can implement the GMPPT of a PV generation system efficiently even in the variable environmental with partial shading conditions