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Real-Time Impedance Estimation in Grid-Connected Photovoltaic System Using the Discrete Fourier Transform | IEEE Conference Publication | IEEE Xplore

Real-Time Impedance Estimation in Grid-Connected Photovoltaic System Using the Discrete Fourier Transform


Abstract:

The insertion of distributed generation sources into the system, such as solar power, has been challenging the monitoring, control, and protection systems. In this contex...Show More

Abstract:

The insertion of distributed generation sources into the system, such as solar power, has been challenging the monitoring, control, and protection systems. In this context, one of the most important parameter for monitoring the power system is the grid impedance. The grid impedance estimation is helpful for control system in the grid-connected photovoltaic system, detection of the islanding conditions, and protection systems. In this paper, a discrete Fourier transform-based impedance estimation active method, available in the literature, was evaluated in an experimental platform of a three-phase photovoltaic system. The experimental tests were obtained through two actual case studies, including alteration of resistance and inductance of the grid impedance as well as by inserting linear and non-linear loads at the point of common coupling.
Date of Conference: 07-09 November 2018
Date Added to IEEE Xplore: 10 January 2019
ISBN Information:
Conference Location: Brasília, Brazil

I. Introduction

The conventional power systems have changed by the addition of power generation sources, such as photovoltaic (PV) system, in the distribution systems due to environmental issues, rapid response to high demand, proximity to local loads, increase of the system reliability, etc [1], [2]. This new system configuration has been challenging the monitoring, control, and protection system. A relevant parameter in this new system configuration is the impedance. In the control systems, the variation of the impedance in the network can be used to investigate and improve the operation of the system by the injection of active or reactive power [3]. In protection systems, the impedance estimation has been presented as an alternative to detect problems in the grid, such as islanding and ground faults [4]. Therefore, the correct impedance estimation of the grid is a useful tool for the best performance in this new system configuration.

References

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