A Novel Impedance Measurement Technique for Power Electronic Systems

Xiao, Peng; Venayagamoorthy, G.K.; Corzine, Keith

doi:10.1109/pesc.2007.4342117

Cited by 16 publications

(8 citation statements)

References 11 publications

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“…The FFT was chosen as a method for this study since the algorithm is readily available in allot of math processing application software packages. The impedances are then calculated from (7)- (10), and the process is repeated for all injection frequencies of interest. By contrast, a dc impedance calculation algorithm is relatively simple.…”

Section: Techniques Of Ac Impedance Extractionmentioning

confidence: 99%

“…Methods of extracting impedance in dc systems have been well established [4]- [10], whereby small disturbance signals at various frequencies are injected into the system, and the pertinent currents and voltages are measured and processed to obtain the desired impedance or admittance over the frequency range of interest. The disturbance injection may be a shunt current or a series voltage.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Small-Signal Impedance Measurement of Power-Electronics-Based AC Power Systems Using Line-to-Line Current Injection

Huang

Corzine

Belkhayat

2009

IEEE Trans. Power Electron.

217

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Naval ships as well as aerospace power systems are incorporating a greater degree of power electronic switching sources and loads. Although these components provide exceptional performance, they are prone to instability due to their high efficiency and constant power characteristics that can exhibit negative impedance nature at certain frequencies. When designing these systems, integrators must consider the impedance versus frequency at an interface (which designates source and load). Stability criteria have been developed in terms of source and load impedances for both dc and ac systems, and it is often helpful to have techniques for impedance measurement. For dc systems, the measurement techniques have been well established. This paper introduces a new method of impedance measurement for three-phase ac systems. By injecting an unbalanced line-to-line current between two lines of the ac system, all impedance information in the traditional synchronous reference frame d−q model can be determined. For medium-voltage systems, the proposed technique is simpler and less costly than having an injection circuit for each phase. Since the current injection is between only two phase lines, the proposed measurement device can be used for both ac and dc interfaces. Simulation and laboratory measurements demonstrate the effectiveness of this new technique.Index Terms-Impedance measurement, power conversion, power system stability, power system testing.

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Section: Techniques Of Ac Impedance Extractionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Small-Signal Impedance Measurement of Power-Electronics-Based AC Power Systems Using Line-to-Line Current Injection

Huang

Corzine

Belkhayat

2009

IEEE Trans. Power Electron.

217

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“…Guerrero et al [6] analyzed the selection of droop gains to ensure microgrid stability. Liu et al [9] and Xiao et al [10] indicated that a large droop gain will result in system instability using a small signal model. Pogaku et al [2] indicated that instabilities can be avoided by modifying the power electronic control mode.…”

Section: Introductionmentioning

confidence: 99%

New Techniques for Impedance Characteristics Measurement of Islanded Microgrid based on Stability Analysis

Hou¹,

Zhuo²,

Shi³

2016

Journal of Power Electronics

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In recent years, microgrids have been the focus of considerable attention in distributed energy distribution. Microgrids contain a large number of power electronic devices that can potentially cause negative impedance instability. Harmonic impedance is an important tool to analyze stability and power quality of microgrids. Harmonic impedance can also be used in harmonic source localization. Precise measurement of microgrid impedance and analysis of system stability with impedances are essential to increase stability. In this study, we introduce a new square wave current injection method for impedance measurement and stability analysis. First, three stability criteria based on impedance parameters are presented. Then, we present a new impedance measurement method for microgrids based on square wave current injection. By injecting an unbalanced line-to-line current between two lines of the AC system, the method determines all impedance information in the traditional synchronous reference frame d-q model. Finally, the microgrid impedances of each part and the overall microgrid are calculated to verify the measurement results. In the experiments, a simulation model of a three-phase AC microgrid is developed using PSCAD, and the AC system harmonic impedance measuring device is developed.

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“…Jing Huang [11] proposed a line-to-line current injection chopper circuit. P.xiao [12] developed a novel impedance measurement technique for power electronic system by modeling with recurrent neural networks. However, there are some disadvantages in these impedance measurement techniques.…”

Section: Introductionmentioning

confidence: 99%

“…For [9], [10] and [11], they required multiple tests to obtain the impedance characteristics over a wide frequency range for stability analysis. For [12], only one injection and measurement process is required, but it needs to build a model of the system at the specific operating point by training a recurrent neural network.…”

Section: Introductionmentioning

confidence: 99%

A new current injection method for impedance measurement using superposed modulated square pulse

Yue

Zhuo

Zhang

et al. 2013

2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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Harmonic impedance measurement is very important in Micro-grid because of the close relationship between impedance and stability. This paper presents a new current injection method for impedance measurement. Sinusoidal amplitude modulation is a method to shift signals to different frequency bands. A signal with large frequency bandwidth and small amplitude attenuation can be obtained by superposing square pulse signals with sinusoidal amplitude modulation. When the superposed signal is injected to the system as a current source, impedance information in the frequency range of interest can be calculated with short time cost and high accuracy. The simulation results demonstrate the effectiveness of this method.

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A Novel Impedance Measurement Technique for Power Electronic Systems

Cited by 16 publications

References 11 publications

Small-Signal Impedance Measurement of Power-Electronics-Based AC Power Systems Using Line-to-Line Current Injection

Small-Signal Impedance Measurement of Power-Electronics-Based AC Power Systems Using Line-to-Line Current Injection

New Techniques for Impedance Characteristics Measurement of Islanded Microgrid based on Stability Analysis

A new current injection method for impedance measurement using superposed modulated square pulse

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