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Online dynamic conductance estimation based maximum power point tracking of photovoltaic generators

机译:基于在线动态电导估计的光伏发电机最大功率点跟踪

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摘要

In this paper, a novel method of maximum power point tracking of renewable energy generators is proposed, utilizing the sum of dynamic and static conductance as maximum power point tracking loop variable. This allows to formulate the maximum power point tracking problem as a typical closed-loop stabilization task of non-linear static plant with zero reference. Consequently, a simple integrative controller is shown to be sufficient to ensure zero steady-state maximum power point tracking error with easily determinable nominal dynamics. A recently revealed method of online photovoltaic generator dynamic conductance estimation allowing robust terminal voltage control is utilized. Moreover, it is revealed that the resulting maximum power point tracking loop plant is piecewise linear around the maximum power point, i.e. for given environmental conditions two different convergence rates are expected, depending on the relative value of operating voltage to maximum power point voltage. Presented analytical outcomes are verified by application of the proposed maximum power point tracking structure to a grid-connected photovoltaic generator system under robust voltage control.
机译:本文提出了一种利用动态和静态电导之和作为最大功率点跟踪环路变量的可再生能源发电机最大功率点跟踪的新方法。这允许将最大功率点跟踪问题公式化为具有零参考的非线性静态工厂的典型闭环稳定任务。因此,显示出一个简单的集成控制器足以确保零稳态最大功率点跟踪误差以及容易确定的标称动态特性。利用了最近公开的在线光伏发电机动态电导估计方法,该方法允许可靠的终端电压控制。此外,揭示了所得到的最大功率点跟踪环路装置在最大功率点周围是分段线性的,即,对于给定的环境条件,取决于工作电压与最大功率点电压的相对值,预期两个不同的收敛速度。通过在鲁棒电压控制下将建议的最大功率点跟踪结构应用于并网光伏发电系统,可以验证所提出的分析结果。

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