光伏发电系统并网供电最大功率点跟踪控制  

Maximum Power Point Tracking Control of Grid Connected Photovoltaic Power Generation System

作　　者：李欣月 许军[1] LI Xin-yue;XU Jun(College of Eleetrieal and Control Engineering,Xi'an University of Seieneeand Technology,Xi'an Shanxi 710054,China)

机构地区：[1]西安科技大学电气与控制工程学院,陕西西安710054

出　　处：《计算机仿真》2019年第1期117-121,共5页Computer Simulation

摘　　要：太阳光照强度的发散性和随意性使得光伏电池自然转换效率普遍低下,为了降低成本及提高太阳能利用率,对光伏阵列进行最大功率点跟踪(MPPT)控制。针对传统扰动观察算法最大功率点跟踪由于固定步长产生的系统振荡和响应速度差的问题,提出了一种变步长的新型电导增量控制算法,通过最优化寻优思想加快搜索速度找到最大功率点。建立了以Boost电路为核心的两级式并网逆变结构光伏发电系统MPPT的仿真模型。通过Matlab对传统的扰动观测法和改进后的新型电导增量法进行了MPPT的仿真。结果表明,改进后的变步长电导增量法在系统振荡和调节时间上都优于扰动观测法,更加快速跟踪最大功率点,使输出功率精准的稳定于固定值。The sun light intensity divergence and randomness make photovoltaic cells natural conversion efficiency generally low. In order to reduce the cost and improve the solar energy utilization,the maximum power point tracking( MPPT) control of PV arrays is required. In order to solve the problem of system oscillation and poor response speed due to the fixed step size in the traditional perturbation observation method,a new variable step size incremental conductance control algorithm with variable step size was proposed to improve the search speed by optimizing the optimization idea. A simulation model of two stage grid-connected photovoltaic system MPPT with Boost circuit as the core was established. The MPPT simulation of the traditional perturbation observation method and the improved new conductance increment method were simulated through Matlab. The results show that the improved variable step conductance increment method is superior to the perturbation observation method in system oscillation and regulation time,and it can track the maximum power point more quickly,and make the output power accurate and stable at a fixed value.

关 键 词：光伏电池 输出特性 最大功率跟踪 仿真模型 

分 类 号：TM615[电气工程—电力系统及自动化]