基于双指数函数变步长电导增量法改进的光伏最大功率跟踪控制策略
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Improvement of MPPT Control Strategy Based on Double Exponential Variable Step Size Increment Conductance Method
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    摘要:

    针对目前采用单一步长跟踪的MPPT控制策略中,存在步长选取的差异无法兼得系统动态性能和稳态精度的问题,文中提出了恒压启动法与双指数函数步长算法结合的改进的MPPT控制策略。在启动时采用恒定电压法快速定位在最大功率点(MPP)附近,然后利用双指数函数改变步长并精确跟踪光伏最大功率点,利用两种指数函数的函数特性实时调整MPP两侧的步长叠加量,进一步优化变步长跟踪效果。最后在MATLAB/Simulink平台中进行对比分析,结果验证了所提出的算法,对提高光伏MPPT的快速性和减小稳态波动是有效的。

    Abstract:

    For the current MPPT control strategy that adopts single step size tracking, there is a problem that the difference in step size selection cannot obtain the system dynamic performance and steady-state accuracy simultaneously. In this paper, an improved MPPT control strategy combining constant voltage startup method and double exponential function step size algorithm is proposed. When starting up, the constant voltage method is used to locate the maximum power point (MPP) quickly, and then the double exponential function is used to change the step size and accurately track the PV maximum power point. The function characteristics of the two exponential functions are used to adjust the step size superposition on both sides of MPP in real time, so as to further optimize the tracking effect of variable step size. Finally, a comparative analysis is carried out in MATLAB/Simulink, and the results verify that the proposed algorithm is effective in improving the speediness of photovoltaic MPPT and reducing the steady-state fluctuation.

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闫志威,王志和,李靖. 基于双指数函数变步长电导增量法改进的光伏最大功率跟踪控制策略[J]. 科学技术与工程, 2020, 20(24): 9904-9910.
yanzhiwei, lijing. Improvement of MPPT Control Strategy Based on Double Exponential Variable Step Size Increment Conductance Method[J]. Science Technology and Engineering,2020,20(24):9904-9910.

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  • 收稿日期:2019-11-09
  • 最后修改日期:2020-06-03
  • 录用日期:2020-03-25
  • 在线发布日期: 2020-09-21
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