基于扰动观察法的最大功率跟踪的实现.pdf

学兔兔 总第47卷 第539期 电测与仪表 Vo1．47 NO．539 2010年 第l1期 Electrical Measurement Instrumentation NOV．2010 基于扰动观察法的最大功率跟踪的实现 吴华波 (广东嘉应学院，广东梅州514015) 摘要：对光伏并网逆变系统最大功率算法中的扰动观察法的实现问题进行研究。在分析光伏电池伏安特性的基 础上，提出扰动观察法的实现算法。通过比较前后两次功率的大小来决定光伏电池电压扰动的方向，使光伏电 池最终达到最大功率点。最大功率跟踪过程中直流侧存在功率脉动，干扰最大功率判断。合理设置滤波算法和 采样周期，可滤除直流侧功率脉动。通过设置直流电压控制环节，使系统在最大功率跟踪过程中直流电压保持 平稳。实验结果表明，该算法可有效跟踪光伏电池最大功率点，适用于光伏并网逆变系统。 关键词：并网逆变；最大功率跟踪；扰动观察法；采样周期；滤波 中图分类号：TM933 文献标识码：B 文章编号：1001—1390(2010)11-0042—05 Realization of Perturbation and Observation Based on Maximum Power Point Tracking Algorithm WU Hua-bo (Guangdong Jiaying University，Meizhou 5 14015，Guangdong，China) Abstract：A perturbation and observation algorithm based maxim power point tracking algorithm in the photov0haic inverting system is studied．When the Volt—ampere characteristic of the PV battery is analyzed，a realization method of the perturbation and observation algorithm is proposed．By comparing the former and latter powers，the voltage perturbation direction is decided and the PV battery reaches the maxim power point ultimately．During tracking the maxim power point，the power pulsation occurs in DC side and will disturb judging the maximum power．If a rational filtering algorithm and sampling period is configured，the power pulsation in DC side can be eliminated．Having set the DC voltage control loop，the DC voltage keeps stable during tracking the maximum power point of the system． The experimental results show that this algorithm can track the