变PWM步长的爬山法在光伏发电系统中的应用

为了最大限度的利用太阳能,避免因外部环境或负载突变时传统算法在最大功率点跟踪过程中出现的功率连续振荡、稳态精度低的问题,本文对光伏发电系统提出了一种变PWM步长的爬山算法。该方法是在单次迭代中确定扰动方向和步长大小来追踪最大功率点。通过仿真和实验两方面验证了变步长爬山算法在稳态和动态两种条件下MPPT系统的输出特性,并对比固定步长的爬山法对MPPT系统的性能进行了综合评估。结果表明变步长爬山算法的有效性,该方法能快速精确地搜索到光伏阵列的最大功率点,减少了响应时间、恢复时间和功率振荡,提高了光伏发电系统的能量转换效率。

Application of hill climbing method with variable PWM step in photovoltaic power generation system

In order to maximize the use of solar energy, to avoid the external environment or the load power oscillation, steady-state accuracy problem of low mutation when the traditional algorithm in maximum power point tracking process, this paper proposes a variable step hill-climbing algorithm PWM of photovoltaic power generation system. The method is to determine the disturbance direction and step size in single iteration to track the maximum power point. The output characteristics of variable step hill-climbing algorithm MPPT in the steady state and dynamic under the two conditions of the system is validated through two aspects of simulation and experiment, and the performance of the fixed step climbing method compared to the MPPT system for a comprehensive assessment. The results showed that the effectiveness of the variable step hill-climbing algorithm, this method can quickly and accurately search the maximum power point of PV array, reduce the response time, recovery time and power oscillation, improves the energy conversion efficiency of photovoltaic power generation system.