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基于微分几何的微网Z源逆变器并网控制

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Keywords: 微网,微分几何,Z源逆变器,并网,光伏系统

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Abstract:

针对应用于微网系统中的Z源逆变器及其并网控制研究,以光伏系统为例,根据Z源变换器本身具有的非线性特性,建立Z源逆变器直流链及逆变侧的仿射非线性模型,利用微分几何基本工具,构造恰当的坐标变换和预反馈,将原非线性系统精确线性化,然后对该系统进行线性最优控制器设计。该逆变器集最大功率点跟踪、升降压和并网发电等功能于一体。仿真及实验表明当光伏电池在输入条件发生变化时,本文控制方法能够使Z源逆变器直流链快速稳定无超调地跟踪最大功率点,逆变侧输出的三相电压能够实现快速平稳过渡并改善并网电流畸变。

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