A Center Point Iteration MPPT Method With Application on the Frequency-Modulated LLC Microinverter
A Center Point Iteration MPPT Method With Application on the Frequency-Modulated LLC Microinverter
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DOI：
10.1109/tpel.2013.2262806
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发表时间：
2014-03
影响因子：
6.7
通讯作者：
Qian Zhang;Changsheng Hu;Lin Chen;A. Amirahmadi;N. Kutkut;Z. Shen;I. Batarseh
中科院分区：
文献类型：
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作者：
Qian Zhang;Changsheng Hu;Lin Chen;A. Amirahmadi;N. Kutkut;Z. Shen;I. Batarseh
最大功率点跟踪（MPPT）是在变化的环境下收集光伏功率的基本技术。扰动观察（P& O）算法是最广泛使用的MPPT由于其有效性和简单性。然而，它是很难平衡的跟踪速度和振荡的要求，在传统的P& O与固定的扰动。自适应P& O技术已被提出作为这些问题的解决方案。然而，它们基于传统脉宽调制转换器的占空比调制。但没有一个研究谐振变换器的变频调制。本文提出了一种中心点迭代最大功率点跟踪算法，该算法在频率上具有可变扰动。该方案克服了传统的P& O的缺点，计算简单。此外，它适用于各种功率曲线，特别是LLC微逆变器的功率曲线，这可能会混淆传统的MPPT算法。从理论上验证了该方法的有效性。搭建了一台300 W的样机，实验结果验证了中心点迭代MPPT的有效性。还推出了一个高级版本，以加快跟踪速度。
Maximum power point tracking (MPPT) is an essential technique to harvest PV power under varying environments. Perturb and observe (P& O) algorithms are the most broadly used MPPT due to their effectiveness and simplicity. However, it is difficult to balance the tracking speed and oscillation requirements in the conventional P& O with fixed perturb. Adaptive P& O techniques have been proposed as a solution to these problems. However, they are based on duty cycle modulation for conventional pulse width modulation converters. None of them deal with the variable frequency modulation for resonant converters. In this paper, a center point iteration MPPT is proposed, with its variable perturb in frequency. The proposed scheme overcomes the drawbacks of conventional P& O with a simple calculation. Moreover, it is suitable for various power curves, especially the LLC microinverter power curves, which may confuse conventional MPPT algorithms. The effectiveness of the proposed MPPT method was verified in theory. A 300 W prototype was constructed, and the experimental results verified the effectiveness of the proposed center point iteration MPPT. An advanced version was also introduced in order to accelerate the tracking speed.