基于模糊PI双向线性预测的光伏MPPT控制

发布时间：2018-01-05 10:03

本文关键词：基于模糊PI双向线性预测的光伏MPPT控制　出处：《太阳能学报》2014年11期 　论文类型：期刊论文

【摘要】：使用扰动观察法的光伏系统在初始化启动过程中或光强发生较大变化时,由于受扰动步长的限制,无法快速接近最大功率点,造成大量能量的浪费。针对该情况提出一种快速最大功率点预测算法。首先将光伏P-U曲线在0点附近Taylor展开,取线性部分作为功率函数P(u)的近似方程。由于P-U曲线存在两个0点,近似方程将从曲线的两个方向交于一点,然后近似认为P-U曲线在该点取得最大功率。最后P-U结合曲线恒压恒流区的特点,计算预测误差并给出剩余搜索范围。双向线性预测的思想用于近似估计最大功率点,此后通过模糊PI控制提高跟踪精度。此方法有效克服了扰动观察法速度与精度无法兼顾的矛盾,相对经验值预测法,该方法不依赖于统计规律,其精度受环境因素的影响较小。仿真及实验结果表明该方法具有快速、高效的优点。
[Abstract]:The photovoltaic system using perturbation observation method can not get close to the maximum power point quickly because of the limitation of disturbance step size when initializing the photovoltaic system or when the light intensity changes greatly. A fast maximum power point prediction algorithm is proposed in this paper. Firstly, the P-U curve of photovoltaic system is expanded in the vicinity of zero point Taylor. The linear part is taken as the approximate equation of the power function Pu). As there are two zero points in the P-U curve, the approximate equation will intersect at one point from the two directions of the curve. Then it is considered that the P-U curve obtains the maximum power at this point. Finally, the P-U curve is combined with the characteristics of the constant voltage and constant current region of the curve. The prediction error is calculated and the residual search range is given. The idea of bidirectional linear prediction is used to approximate estimate the maximum power point. After that, the tracking accuracy is improved by fuzzy Pi control. This method effectively overcomes the contradiction between the speed and precision of the disturbance observation method. The method does not depend on the statistical law. The simulation and experimental results show that the method is fast and efficient.
【作者单位】：四川大学电气信息学院;
【基金】：四川省科技支撑项目(2011fz0003;2012FZ0047) 成都市科技局高校成果转化项目(11DXYB004JH-027;12DXYB279JH)
【分类号】：TM615
【正文快照】： o弓|f 测的误差进行分析。光伏发电因为其低污染、低噪音、储量丰富等优 1光伏模型点,目前已在新能源领域得到广泛运用。但光伏发光伏电池是利用光生伏特效应把光能转换为电电转换效率低和易受天气的影响依然是最大瓶颈,能的装置,其工程模型可表示为[3]:因此光伏发电系统必须

【参考文献】