基于无源性的光伏并网逆变器电流控制

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摘要针对光伏并网逆变器的数学模型呈现非线性特性, 采用无源控制(PBC) 理论得出的算法对逆变器进行控制, 可使并网逆变器具备优良的动、静态特性。本文根据并网逆变器的欧拉-拉格朗日(EL) 数学模型和严格无源性, 得到了使逆变器网侧dq轴电流解耦的无源控制律。为提高逆变器的动态性能, 采用注入阻尼方法对控制器进行了优化设计, 实现对给定电流及最大功率点快速跟踪。计算机仿真和4kW样机试验均表明, 基于无源性的光伏并网逆变器电流控制策略是可行的。

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	王久和
	慕小斌

关键词 ：光伏并网逆变器, 无源控制, 阻尼注入, 解耦

Abstract：In view of the nonlinear mathematical model of the photovoltaic(PV) grid-connected inverter, the passivity-based control(PBC) is adapted for the inverter, and it can make the inverter possess excellent dynamic and static characteristics. In this paper the control law that can decouple dq axis currents at AC side of the grid based on the Euler-Lagrange(EL) model, and the passivity of inverter is proved. In order to improve the dynamic performance of the inverter, we can adopt the approach called injecting damping to optimize the controllerps adopted, and it can also make the current to fast track the desired one and track the PV array maximum power point. Simulation and 4kW prototype results show that the current control strategy of Photovoltaic grid-connected inverter based on passivity is practicable.

Key words： PV grid-connected inverter passivity-based control injecting damping decoupling

收稿日期: 2011-12-07 出版日期: 2014-03-20

PACS:

TM464

基金资助:国家自然科学基金 (51077005) 和北京市人才强教深化计划“学术创新团队计划”(PHR201007130) 资助项目。

作者简介: 王久和男, 1959年生, 博士, 教授, 博士生导师, 研究方向为电力电子与电力传动, 非线性控制理论与应用。慕小斌男, 1986年生, 硕士研究生, 研究方向为并网逆变器非线性控制研究。

引用本文:

王久和, 慕小斌. 基于无源性的光伏并网逆变器电流控制[J]. 电工技术学报, 2012, 27(11): 176-182. Wang Jiuhe, Mu Xiaobin. Current Control Strategy of Photovoltaic Grid-Connected Inverter Based on Passivity. Transactions of China Electrotechnical Society, 2012, 27(11): 176-182.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2012/V27/I11/176

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