New Techniques for Measuring Impedance Characteristics of Three-Phase AC Power Systems

Familiant, Y.A.; Huang, Jing; Corzine, Keith; Belkhayat, M.

doi:10.1109/tpel.2009.2016966

Cited by 107 publications

(46 citation statements)

References 20 publications

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“…The method for calculating the impedance matrix is based on the work in [15], and it is necessary to combine two linear independent injection signals as explained in [15] and [16]. A possible combination of injection signals is:…”

Section: Simulationsmentioning

confidence: 99%

Apparent Impedance Analysis: A Small-Signal Method for Stability Analysis of Power Electronic-Based Systems

Rygg

Molinas

2017

IEEE J. Emerg. Sel. Topics Power Electron.

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Abstract-In this paper a new method for power system stability analysis is introduced. The method is based on injection of a small voltage or current in an arbitrary point of a power system. The apparent impedance is then defined as the ratio between the voltage and current at the injection point. It is shown that the apparent impedance can be used to estimate the eigenvalues of the system that are observable from the injection point. The eigenvalues are obtained by applying system identification techniques to the measured set of apparent impedances. The method is similar to the well established impedance-based stability analysis based on source and load impedance models. However, while the source/load impedance ratio is viewed as the minor-loop gain, the apparent impedance can be viewed as a closed-loop transfer function. It can also be expressed as the parallel connection of the source and load impedance. It is shown in the paper how the system eigenvalues can be extracted based on a set of apparent impedance values. The apparent impedance holds therefore complementary information compared with the existing impedance-based stability analysis. The method can also be used as a tool to validate analytically derived state-space models. In this paper the method is presented as a simulation tool, while further work will extend it to include experimental setups.Two case-studies are presented to illustrate the method. 1) A DC-case with a buck converter feeding a constant power load, and 2) a three-phase grid-connected VSC with current controller and PLL. The estimated (apparent) eigenvalues of the studied systems are equal to those obtained from the analytic state-space model.

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Section: Simulationsmentioning

confidence: 99%

Apparent Impedance Analysis: A Small-Signal Method for Stability Analysis of Power Electronic-Based Systems

Rygg

Molinas

2017

IEEE J. Emerg. Sel. Topics Power Electron.

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“…This analysis is straightforward once the impedance curves are established. The ratio L(s) between source and load impedance has been calculated separately for the source and load impedance (6). This has been performed both for the frequency sweep impedances (Fig.…”

Section: Nyquist Stability Analysismentioning

confidence: 99%

Real-time stability analysis of power electronic systems

Rygg

Molinas

2016

2016 IEEE 17th Workshop on Control and Modeling for Power Electronics (COMPEL)

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Abstract-The paper presents a new method for performing online stability analysis of power electronic systems. The method is based on impedance analysis, where the only information required are measurements taken at a single point. The proposed method injects current composed by several frequencies. The impedance is estimated at these frequencies, and the Vector Fitting method is used to estimate a continuous impedance model. The Nyquist Criterion is then applied to the fitted models of source and load subsystem impedance. The stability analysis is performed continuously with an update rate up to 10 Hz. The proposed method has been compared with the conventional frequency sweep method in an experimental setup.

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“…In the method of measurement, the impedance of the system is directly measured by the additional measuring device [52], and the method is simple and feasible, but additional hardware input will be introduced. Instead, the estimation rule directly uses the digital controller of the grid connected inverter to accomplish the detection of the system impedance, and this method is divided into active and passive [50].…”

Section: Power Grid Impedance Detectionmentioning

confidence: 99%

Overview of Multi-functional Grid-connected Inverter and Its Application in Micro-grid

Zhang¹,

Yang²,

Zhao³

2016

IJGDC

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New Techniques for Measuring Impedance Characteristics of Three-Phase AC Power Systems

Cited by 107 publications

References 20 publications

Apparent Impedance Analysis: A Small-Signal Method for Stability Analysis of Power Electronic-Based Systems

Apparent Impedance Analysis: A Small-Signal Method for Stability Analysis of Power Electronic-Based Systems

Real-time stability analysis of power electronic systems

Overview of Multi-functional Grid-connected Inverter and Its Application in Micro-grid

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