Journal of Modern Power Systems and Clean Energy

ISSN 2196-5625 CN 32-1884/TK

Optimized Fuzzy Controller for MPPT of Grid-connected PV Systems in Rapidly Changing Atmospheric Conditions
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Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran

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    Abstract:

    Due to nonlinear behavior of power production of photovoltaic (PV) systems, it is necessary to apply the maximum power point tracking (MPPT) techniques to generate the maximum power. The conventional MPPT methods do not function properly in rapidly changing atmospheric conditions. In this study, a fuzzy logic controller (FLC) optimized by a combination of particle swarm optimization (PSO) and genetic algorithm (GA) is proposed to obtain the maximum power point (MPP). The proposed FLC uses the ratio of power variations to voltage variations and the derivative of power variations to voltage variations as inputs and uses the duty cycle as the output. The range of changes in fuzzy membership functions and fuzzy rules are proposed as an optimization problem optimized by the PSO-GA. The proposed design is validated for MPPT of a PV system using MATLAB/Simulink software. The results indicate a better performance of the proposed FLC compared to the common methods.

    表 1 Table 1
    表 3 Table 3
    表 2 Table 2
    表 5 Table 5
    图1 I-V and P-V characteristics in variable irradiances. (a) I-V characteristics. (b) P-V characteristics.Fig.1
    图2 I-V and P-V characteristics in variable temperatures. (a) I-V characteristics. (b) P-V characteristics.Fig.2
    图3 Sample of FLC membership function.Fig.3
    图4 Flowchart of PSO-GA.Fig.4
    图5 Results of PSO-GA.Fig.5
    图6 Optimal results of membership functions of FLC with parameter E, dE or D. (a) E. (b) dE. (c) D.Fig.6
    图7 PV system under study.Fig.7
    图8 Voltage variations with variable temperatures and constant irradiance.Fig.8
    图9 Power variations with variable temperatures and constant irradiance.Fig.9
    图10 Voltage outputs with variable irradiances and constant temperature.Fig.10
    图11 Power outputs with variable irradiances and constant temperature.Fig.11
    图12 Power outputs with variable irradiances and temperatures.Fig.12
    表 4 Table 4
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History
  • Received:February 12,2019
  • Online: March 22,2021