Online grid impedance estimation for single-phase grid-connected systems using PQ variations

被引：115

作者：

Ciobotaru, Mihai ^{[1
]}

Teodorescu, Remus ^{[1
]}

Rodriguez, Pedro

Timbus, Adrian ^{[1
]}

Blaabjerg, Frede ^{[1
]}

机构：

[1] Aalborg Univ, Inst Energy Technol, DK-9220 Aalborg, Denmark

来源：

2007 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-6 | 2007年

关键词：

grid impedance estimation; distributed generation; grid-connected systems; islanding detection; adaptive control;

D O I：

10.1109/PESC.2007.4342370

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper presents an online grid impedance estimation method for single-phase grid-connected systems, such as photovoltaic systems, small wind turbines, fuel-cells power systems. The method is based on producing a small perturbation on the output of the power converter that is in the form of periodical variations of active and reactive power (PQ variations). The main idea is to make the power converter working in two operation points in order to solve the equation of the equivalent grid impedance. During the perturbation, measurements of voltage and current are performed and signal processing algorithms are used in order to estimate the value of the grid impedance. The online grid impedance estimation method can be used for compliance with the anti-islanding standard requirements (IEEE1574, EEEE929 and VDE0126) and for adaptive control of the grid-connected converters. The proposed method is embedded in the existing power converter control. The selected results validate the effectiveness of the proposed method.

引用

页码：2306 / 2312

页数：7

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