天气变化时光伏并网系统MPPT算法的仿真研究

光伏并网系统在天气快速变化时,采用传统的扰动观测算法会产生误判。针对这一问题,对dP-P&O算法进行了改进,提出了dP-P&O-dP最大功率跟踪算法,进一步减少了最大功率跟踪过程中的误判现象。引入了变步长的方法解决了跟踪快速性与稳态稳定性难以兼顾的问题,并给出了步长系数的设计原则。在详细分析光伏阵列输出特性的基础上,建立了其随光照变化的仿真模型,并且简化了并网逆变器的模型,采用MATLAB中的S函数编写了提出的最大功率跟踪算法的仿真算法,大大提高了仿真的速度。通过对仿真结果的比较分析,表明了该算法的正确性和有效性。

Simulation Research on MPPT Method of PV Systems Considering Weather Changing

In case of the weather changing rapidly,it is unable to determine the right tracking direction using the traditional P&O method in PV systems. The dP-P&O-dP method was proposed based on the dP-P&O method in order to improve the system performance. It can solve the problem in case of the rate of irradiation changing changes while the dP-P&O method cannot. The variable step size method was also introduced to improve the dynamic performance and minimize the oscillation at steady state and the principle of step...