Efficient extraction of the maximum power from photovoltaic (PV) systems under inherently variable weather conditions is a key issue that has been tackled in recent years. Maximum power extraction techniques are relevant for increasing the penetration of PV systems into electric systems. This paper presents an averaged current mode control strategy as a maximum power extraction technique in a photovoltaic high step-up dc–dc converter, which can be applied to dc microgrids or ac networks through power inverters. Since the generated power of a photovoltaic system is related to the terminal voltage, power extraction is given through the regulation of the converter’s input voltage. For this purpose, in the proposed averaged current mode control, the inner current loop uses the inductor current as a feedback signal, which improves the dynamic behavior of the converter with a simple gain. Meanwhile, the outer voltage loop is built with a proportional-integrative controller for regulation. The converter and control strategy are able to track rapid irradiance changes. They are also able to maintain the photovoltaic voltage regulation under dc bus voltage variations. The performance of the proposed control scheme is validated experimentally with a 100 W converter prototype.

中文翻译：

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用于高增益光伏应用中最大功率点跟踪的平均电流模式控制

在固有可变天气条件下从光伏 (PV) 系统中有效提取最大功率是近年来解决的一个关键问题。最大功率提取技术与增加光伏系统对电力系统的渗透有关。本文提出了一种平均电流模式控制策略，作为光伏高升压 dc-dc 转换器中的最大功率提取技术，可通过逆变器应用于直流微电网或交流网络。由于光伏系统产生的功率与端电压有关，因此通过调节转换器的输入电压来提取功率。为此，在建议的平均电流模式控制中，内部电流环路使用电感电流作为反馈信号，这通过简单的增益改善了转换器的动态行为。同时，电压外环内置比例积分控制器进行调节。转换器和控制策略能够跟踪快速的辐照度变化。它们还能够在直流总线电压变化下保持光伏电压调节。所提出的控制方案的性能通过 100 W 转换器原型进行了实验验证。