一种开路电压和短路电流相结合的MPPT算法研究

发布时间：2019-04-26 06:43

【摘要】：为了能够有效地提高光伏发电系统的最大输出功率,根据光伏电池的输出特性和数学模型,提出了一种新型MPPT算法,即开路电压和短路电流相结合的MPPT算法。利用开路电压、短路电流和S-function函数快速解得最大功率点。针对不断变化的外界环境会给引入该算法的光伏系统带来频繁扰动,以及该算法在理论推导过程中采用了大量的估算算法,因此在该算法中引入阈值电流?I和微变步长扰动法。阈值电流?I降低了系统的扰动,减少能量的损失,微变步长扰动法进一步的修正了系统的最大功率点,解决了因理论估算而带来的误差问题。实验证明,引入了阈值电流和微变步长扰动法的开路电压和短路电流相结合的MPPT算法能快速、准确的跟踪最大功率点,提高转换效率。
[Abstract]:In order to effectively improve the maximum output power of photovoltaic power generation system, a new MPPT algorithm, MPPT algorithm combining open circuit voltage and short circuit current, is proposed according to the output characteristics and mathematical model of photovoltaic cells. The maximum power point is quickly solved by using open circuit voltage, short circuit current and S-function. In view of the changing external environment, it will bring frequent disturbance to the photovoltaic system which is introduced into the algorithm, and the algorithm adopts a large number of estimation algorithms in the process of theoretical derivation. Therefore, the threshold current? I and the perturbation method with variable step size are introduced into the algorithm. The threshold current? I reduces the disturbance and energy loss of the system. The micro-variable step-size perturbation method further modifies the maximum power point of the system and solves the error problem caused by the theoretical estimation. The experimental results show that the MPPT algorithm which combines threshold current and small variable step perturbation method with open circuit voltage and short circuit current can track the maximum power point quickly and accurately and improve the conversion efficiency.
【作者单位】：河南师范大学物理与电子工程学院;
【分类号】：TM914.4

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