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Enhanced Power Output from the PV with Low Input Ripple DC-DC Converter

机译：具有低输入纹波DC-DC转换器的PV增强的功率输出

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摘要

The primary objective of Maximum Power Point Tracking (MPPT) for PV systems connected to a low-voltage DC grid is to extract the maximum possible power output from the PV array. Normally high-frequency switched mode power converters are employed to track the maximum power. These converters, however, impose switching frequency voltage ripple on the PV output. This causes fluctuation around the Maximum Power Point (MPP) and results in power loss. These losses can be reduced using electrolytic capacitors, however, the electrolytic capacitors' lifespan is relatively shorter than that of a PV panel. In this paper, an interleaved boost converter is used to reduce high-frequency voltage ripple introduced on panel. Hence, smaller values of longer lifespan capacitors such as film capacitors will be sufficient to curtail the smaller ripple. Moreover, film capacitors are selected based on voltage ripple. Analysis was carried out for calculating voltage ripple imposed on PV module to select input filter more precisely. In addition, reduction in the voltage ripple is calculated quantitatively and is compared with that of a conventional boost converter. Enhanced power output from the PV panel is mathematically proven and experimentally demonstrated.
机译：连接到低压直流电网的光伏系统的最大功率点跟踪（MPPT）的主要目的是从光伏阵列中提取最大可能的功率。通常，采用高频开关模式功率转换器来跟踪最大功率。但是，这些转换器会在PV输出上施加开关频率电压纹波。这会引起最大功率点（MPP）周围的波动，并导致功率损耗。使用电解电容器可以减少这些损耗，但是，电解电容器的寿命相对短于PV面板的寿命。在本文中，交错式升压转换器用于减少面板上引入的高频电压纹波。因此，更长寿命的电容器（例如薄膜电容器）的较小值将足以抑制较小的纹波。此外，根据电压纹波选择薄膜电容器。进行了分析以计算施加在PV模块上的电压纹波，从而更精确地选择输入滤波器。另外，可以定量地计算出电压纹波的减小量，并将其与传统的升压转换器进行比较。从光伏面板获得的增强的功率输出在数学上得到了证明和实验证明。

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