基于改进扰动观测法的光伏阵列MPPT算法研究  

Research of Maximum Power Point Tracking Algorithms of Photovoltaic Arrays Based on the Improved Disturbance of Observer Method

作　　者：陈霞[1] 赵峰印 王爱玉[1] 胡亚超[1] 卢正通 聂兴成 CHEN Xia;ZHAO Fengyin;WANG Aiyu;HU Yachao;LU ZHengtong;NIE Xingcheng(College of Electrical Engineering and Automation,Shandong University of Science and Technology,Qingdao 266590,Shandong,China)

机构地区：[1]山东科技大学电气与自动化工程学院,山东青岛266590

出　　处：《电气传动》2017年第3期66-69,77,共5页Electric Drive

摘　　要：光伏阵列的输出功率容易受到光强、温度变化的影响而发生变化。为了保证光伏阵列始终以最大功率输出,提高光伏并网发电系统的发电效率,需要采用最大功率点跟踪技术。针对定步长的扰动观测法存在的振荡和误判问题,并考虑到快速性和跟踪精度的要求,提出了一种改进算法,即将逐步逼近法和滞环比较法相结合的扰动观测法。在分析光伏阵列数学模型的基础上,基于PSCAD/EMTDC搭建了三相光伏并网发电系统模型,通过仿真分析比较了传统的定步长扰动观测法和改进算法,验证了改进控制算法的准确性和有效性。The output power of the PV array will be changed due to the light intensity and temperature change.In order to ensure that the output of photovoltaic array is always at maximum power point and increase the powergeneration efficiency of the photovoltaic power generation system,the maximum power point tracking technologyneeds to be adopted.For oscillation and misjudgment problem of perturbation and observation method based onfixed-step and considering requirements of the speed and accuracy,an improved algorithm that is a perturbation andobservation method of the combination of hysteresis comparison and successive approximation was proposed.On thebasis of analyzing mathematical models,the three-phase grid-connected PV system model was built based on PSCAD/EMTDC,the traditional perturbation and observation method based on fixed-step and improved algorithm werecompared and analyzed through simulating,correctness and validity of the improved control algorithm is verified.

关 键 词：光伏阵列 最大功率点跟踪 扰动观测法 PSCAD仿真 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]