Development of an on-line impedance meter to measure the impedance of a distribution line

Ishigure, Nobuhito; Matsui, Kunihiko; Ueda, Fukashi

doi:10.1109/isie.2001.931852

Cited by 17 publications

(9 citation statements)

References 3 publications

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“…One of these techniques proposes the development of a dedicated inverter topology [11] and by measuring the phase difference between supply and inverter voltage the computation of line impedance. Another technique, which is easy to implement [18], repetitively connects a capacitive load to the network and measures the difference in phase shift of the voltage to the current.…”

Section: B Steady-state Active Methodsmentioning

confidence: 99%

“…According to [13] different techniques, as presented in [7], [8], [9], [10], [11] and [12] can be used for line impedance measurements. It is noticeable that, usually, these methods use special hardware devices.…”

Section: Grid Impedance Estimation Techniquesmentioning

confidence: 99%

“…Active methods make use of deliberately "disturbing" the power supply network followed by acquisition and signal processing [7], [8], [9] and [11]. The way of "disturbing" the network can vary, therefore, active methods are also divided into two major categories: transient methods and steady-state methods, as briefly described in the following.…”

Section: Grid Impedance Estimation Techniquesmentioning

confidence: 99%

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

Ciobotaru

Teodorescu

Rodríguez

et al. 2007

2007 IEEE Power Electronics Specialists Conference

135

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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, IEEE929 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.

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Section: B Steady-state Active Methodsmentioning

confidence: 99%

Section: Grid Impedance Estimation Techniquesmentioning

confidence: 99%

Section: Grid Impedance Estimation Techniquesmentioning

confidence: 99%

See 1 more Smart Citation

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

Ciobotaru

Teodorescu

Rodríguez

et al. 2007

2007 IEEE Power Electronics Specialists Conference

135

View full text Add to dashboard Cite

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“…Figs.1 and 2 show the measurement principle of the distribution system and vector diagrams for the cases of leading current and lagging current by using active elements, if the output voltage is takes place by passive elements such as inductor or resistor, the feeder impedance could be easily measured [1].…”

Section: Principle Of Operationmentioning

confidence: 99%

Measurement Techniques for Distribution Feeder Impedance by High Frequency Injections

Matsui

Koyama

Yamamoto

et al. 2006

2006 1ST IEEE Conference on Industrial Electronics and Applications

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The line impedance could be measured by means of only passive elements such as inductors or resistors, that is presented at first. However, as the voltage and current used for the measurement are increased, the size of the inductor or resistor being used also needs to be increased, so in practice it would be virtually impossible to make an accurate measurement. Because of this, we have developed a novel measurement method for feeder impedance using an inverter circuit, which we describe secondly. In the third place, we propose another feeder impedance measurement method. The novel method is that the high frequency wave with minimum voltage is injected into the distribution feeder system. By means of this method, the feeder capacitance and the feeder inductance can be measured. These proposals are confirmed by the simulation or experiment.

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“…In such situations the impedance identification / measurement experiment is a principal source of the information on the grid [1], [2], [5]. Impedance and voltage observations in the PCC deliver the linear model of the grid which has plenty of useful implementations [5], [6], [7]. The power grid modeling is essential for virtual experiments in which dangerous and untypical power system states have to be investigated.…”

Section: Introductionmentioning

confidence: 99%

Impedance in voltage-current relations description of the power system PCC - experimental investigations of the accuracy of the LTI system model

Staroszczyk

2009

2009 10th International Conference on Electrical Power Quality and Utilisation

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The paper presents experimental verification of the quality of LTI power grid model valid for the frequency range of 8 kHz. The single PCC was investigated so the paper is the local, University grid investigations oriented, however concerns two general important problems: one is the absolute accuracy of real grid impedance measurements to which no direct reference data are accessible, the second is the validity of the LTI model, which is used for description of the complex structure composed of nonlinear and switched power installations. The LTI models form very interesting and useful approximation of the complex reality and have meaningful time and frequency domain interpretation. When used for power grids they deal with their Norton/Thevenin equivalent models. Two components of such a model: impedance and system side sources describe the grid and are discussed in the paper. Rich experimental data were referenced to the structural model of the grid so the paper gives evaluative information on the quality of ad-choc grid modeling. Interesting, incremental method for the estimation of absolute impedance errors was proposed and used for improvement of the implemented DSP. Time varying nature of the investigated grid impedance was presented, and system errors with implementation of LTI model to such a time-varying PCC description are discussed.

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Development of an on-line impedance meter to measure the impedance of a distribution line

Cited by 17 publications

References 3 publications

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

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

Measurement Techniques for Distribution Feeder Impedance by High Frequency Injections

Impedance in voltage-current relations description of the power system PCC - experimental investigations of the accuracy of the LTI system model

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