Implementation and test of an online embedded grid impedance estimation technique for PV inverters

被引：158

作者：

Asiminoaei, L ^{[1
]}

Teodorescu, R

Blaabjerg, F

Borup, U

机构：

[1] Aalborg Univ, Inst Energy Technol, Sect Power Elect Syst, DK-9220 Aalborg, Denmark

[2] Powre Lynx AS, Dept Dev, DK-6400 Sonderborg, Denmark

来源：

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS | 2005年 / 52卷 / 04期

关键词：

digital signal processors (DSPs); discrete Fourier transform (DFT); fixed-point arithmetic; grid impedance measurement; power system monitoring;

D O I：

10.1109/TIE.2005.851604

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

New and stronger power quality requirements are issued due to the increased amount of photovoltaic (PV) installations. In this paper different methods are used for continuous grid monitoring in PV inverters. By injecting a noncharacteristic harmonic current and measuring the grid voltage response it is possible to evaluate the grid impedance directly by the PV inverter, providing a fast and low-cost implementation. This principle theoretically provides an accurate result of the grid impedance but when using it in the context of PV integration, different implementation issues strongly affect the quality of the results. This paper also presents a new impedance estimation method including typical implementation problems encountered, and it also presents adopted solutions for online grid impedance measurement. Practical tests on an existing PV inverter validate the chosen solution.

引用

页码：1136 / 1144

页数：9

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