一种改进型分区域光伏MPPT控制策略的研究  

Research on an improved subregional photovoltaic MPPT control strategy

作　　者：李月英[1] 左明鑫[1] LI Yueying;ZUO Mingxin(School of Electronic and Electrical Engineering,Zhengzhou University of Science and Technology,Zhengzhou Henan 450064,China)

机构地区：[1]郑州科技学院电子与电气工程学院,河南郑州450064

出　　处：《电源技术》2023年第1期112-116,共5页Chinese Journal of Power Sources

摘　　要：针对传统最大功率跟踪控制算法难以解决跟踪速度和稳态震荡的矛盾,根据光伏组件输出电压、电流和功率的关系,把光伏功率-电压(P-U)曲线分为线性区、最大功率区和急速变化区三部分,提出了分区域变步长复合最大功率跟踪控制策略;在线性区和急速变化区通过定步长算法快速追踪到最大跟踪点附近,进入最大功率区后通过牛顿差值法拟合曲线,并计算曲线极值点即为最大功率点。Simulink仿真和实验结果表明:改进型控制策略不仅具有较快的跟踪速度,而且有效地降低了稳态震荡。According to the traditional maximum power tracking control algorithm, it is difficult to solve the contradiction between tracking speed and steady-state oscillation. According to the relationship between the output voltage, current and power of the photovoltaic module, the PV power-voltage(P-U) curve is divided into three parts:linear area, maximum power area and rapid change area. A compound maximum power tracking control strategy with variable step size in different regions is proposed. In linear area and rapid change area, the maximum tracking point is quickly tracked by fixed step algorithm, and the curve is fitted by Newton difference method after entering the maximum power area, and the extreme point of the curve is calculated as the maximum power point. Simulink simulation and experimental results show that the improved control strategy not only has a faster tracking speed, but also effectively reduces the steady-state oscillation.

关 键 词：跟踪速度 稳态震荡 分区域 牛顿插值 变步长 

分 类 号：TM615[电气工程—电力系统及自动化]