基于两级搜索模式的光伏系统MPPT控制

Photovoltaic System MPPT Control Based on the Two-stage Search Mode

设计了一种全新的光伏发电控制系统,发展了两级搜索模式的最大功率点跟踪(MPPT)方法,该方法无需建立光伏阵列的数学模型。第一级全局搜索模式利用电子负载实现对最大功率点(MPP)的快速和近似定位,并防止系统陷入局部功率极大值点。第二级模糊控制模式利用第一级的结果通过对Boost电路占空比的微调,实现对MPP的准确定位。实验表明,无论对于环境条件稳定的系统,还是温度、光照等条件剧烈变化的系统,所提出的两级式搜索模式都可以实现对光伏系统MPP的实时、准确、快速跟踪。

A new photovoltaic generation control system is designed.The maximum power point tracking（MPPT） meth- od based on two-stage search mode is invented.The first stage is global scan mode which adopts the electronic load to locate the maximum power point（MPP） quickly and approximately and prevents the system into local maximum va- lue point.The second stage is fuzzy control mode which locates the MPP accurately by fine tuning the duty cycle of Boost circuit.The experimental results show that two-stage search mode can track the MPP quickly, exactly and steadily.