| 摘要: |
| 研究了当前光伏系统中最大功率点追踪技术(MPPT)的现状，针对传统MPPT方法在稳态性能与动态性能之间存在的矛盾，提出了一种改进的基于β参数的变步长算法。此算法基于对b-V曲线的分析，对光照强度的上升和下降采用两种不同大小的比例系数，从而在动态实现了快速追踪MPP并且避免了误判现象，同时，在稳态实现了零振荡。为了验证该算法的优越性，基于Matlab/Simulink平台对主要MPPT方法进行仿真分析，同时基于dSPACE和太阳能光伏阵列模拟器搭建实验样机并进行实验测试。仿真与实验结果验证了该算法的优越性，即能实现稳态零振荡及动态过程的快速跟踪。 |
| 关键词: 最大点功率点追踪 变步长 快速追踪 零振荡 |
| DOI：10.7667/PSPC151656 |
| 投稿时间：2015-09-16修订日期：2015-10-28 |
| 基金项目:国家自然科学基金(51407145);电力设备电气绝缘国家重点实验室(EIPE15203)资助 |
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| Research on an improved b-based variable step MPPT algorithm |
| LI Xingshuo,WEN Huiqing |
(Dept of Electrical & Electronic Engineering, Xi’an Jiaotong-Liverpool University, Suzhou 215123, China
;Dept of Electrical & Electronic Engineering, Xi’an Jiaotong-Liverpool University, Suzhou 215123, China
;State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China) |
| Abstract: |
| The current research on maximum power point tracking (MPPT) methods for photovoltaic power system application is reviewed. In order to solve the tradeoff between the steady-state efficiency and dynamic efficiency for the conventional MPPT algorithms, this paper proposes an improved β-based variable step MPPT method. Based on the curve of b-V, the proposed method utilizes two different scaling factors for the solar irradiation increasing and decreasing. Therefore, the proposed method realizes the fast tracking MPP and eliminates misjudgments during the transient stage. Furthermore, the proposed method also realizes zero oscillation during the steady-state stage. In order to show the advantages of the propose method, the simulation analysis of main MPPT methods is carried out in Matlab/Simulink. Furthermore, an experimental prototype by using dSPACE and Solar Array Emulator is built and tested. The simulation and experimental results verify the advantages of the proposed algorithm including zero oscillation in steady state and fast tracking for dynamics. This work is supported by National Natural Science Foundation of China (No. 51407145) and the State Key Laboratory of Electrical Insulation and Power Equipment (No. EIPE15203). |
| Key words: maximum power point tracking (MPPT) variable step fast tracking MPP zero oscillation |
