摘要
根据观测对象的不同,光伏电池的最大功率点跟踪(MPPT)方法可以分为基于输入参数和基于输出参数两种。为了深入分析两种控制方法的动、静态特性,本文以Boost拓扑为最大功率跟踪电路,选用简单有效的扰动观测方法,利用开关平均法建立系统小信号模型,通过求解占空比扰动至输入、输出观测对象之间的小信号传递函数,对比分析了基于输入参数和输出参数MPPT系统的动态特性。分析结果利于合理选择最大功率控制方法,优化系统参数,指导占空比扰动步长和扰动观测周期的选取。
According to the different observing objects, the widely used photovoltaic maximum power point tracking （MPPT） techniques can be divided to two kinds, which are based on input parameters and output parameters respectively. To comprehensively investigate the performance of these two methods, this paper adopts the popular perturb ＆ observe （P＆O） method and develops the small-signal model of a boost MPPT converter using averaged switching method. The transfer functions from variations in the duty cycle to disturbances of the observe objects describes how system parameters influence the dynamic performance, also demonstrates the dynamic performance of each MPPT method. The investigation results are contributed to choose an appropriate MPPT control method, optimize the system parameters, perturb step of the duty cycle and P＆O cycle. The theoretical analysis is verified experimentally.
出处
《电工技术学报》
EI
CSCD
北大核心
2009年第6期95-102,共8页
Transactions of China Electrotechnical Society
