Nonlinear differential flatness control of distributed photovoltaic-energy storage DC generation system

被引：0

作者：

Xue H. ^{[1
]}

Li H. ^{[1
]}

Wang Y. ^{[1
]}

机构：

[1] School of Electric Power Engineering, Shanghai University of Electric Power, Shanghai

来源：

Li, Haixia (497011934@qq.com) | 1600年 / Automation of Electric Power Systems Press卷 / 40期

基金：

中国国家自然科学基金; 上海市自然科学基金;

关键词：

Differential flatness control; Direct current (DC) generation system; Four-phase parallel converters; Improved extremum seeking algorithm;

D O I：

10.7500/AEPS20151120004

中图分类号：

学科分类号：

摘要：

As the traditional converters in distributed photovoltaic-energy storage direct current (DC) generation system will be limited when the power increases or is at higher step-up ratios, four-phase parallel converters are adopted in the proposed system, which can broaden the range of output voltage and suppress oscillation of photovoltaic output voltage. For photovoltaic four-phase parallel boost converters, an improved extremum seeking algorithm is designed to achieve maximun power point tracing and improve the system rapidity and stability in light step change. For energy storage four-phase parallel bidirectional converters, a novel nonlinear control law based on the flatness principle is proposed, which is a simple solution to smooth the output power and stabilize the system with a load mutation or control parameter perturbation. Compared with the conventional proportional-integral control method, the nonlinear differential flatness control algorithm has broader degrees of freedom, fewer steady-state errors and better system stability as proved by simulation and experimental results. © 2016 Automation of Electric Power Systems Press.

引用

页码：102 / 108and115