Impedance Identification Procedure of Three-Phase Balanced Voltage Source Inverters Based on Transient Response Measurements

Valdivia, V.; Lázaro, A.; Barrado, A.; Zumel, P.; Fernández, Cristina; Sanz, M.

doi:10.1109/tpel.2011.2141687

Cited by 73 publications

(38 citation statements)

References 14 publications

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“…The signal increases linearly from 0 Hz to 100 Hz in one second. Compared to the load step used in [7], chirp signal has a constant spectrum on the frequency range of interest instead of being attenuated when frequency increases. In order to obtain clean measurements, the load step of 20% of the converter full rating and nearly 100% of the operating point, was necessary to be applied to the converter under test.…”

Section: A Chirp Excitation Signalsmentioning

confidence: 99%

“…There have been several attempts to extract the impedances of AC systems online in synchronous coordinates [4][5][6][7][8]. The most of them measure one frequency at a time and sweep the frequencies to obtain the whole impedance curve [4,6,8].…”

Section: Introductionmentioning

confidence: 99%

“…Reference [5] shows the usage of a band-limited white noise signal to extract the AC impedances by recurrent neural network. A load step is applied in [7] with system identification technique. The perturbation signal level used in these papers is large, which may excite the nonlinear response of the circuit.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Three-phase AC system impedance measurement unit (IMU) using chirp signal injection

Shen

Jaksic

Mattavelli

et al. 2013

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

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Impedance defined in synchronous coordinates is a useful tool to predict and evaluate stability of three-phase AC systems. For online impedance measurement in AC systems, the widely used frequency sweep method takes a long time and may not be practical in systems where the operating point cannot be maintained for a long time. A wide bandwidth signal could be used to significantly reduce the measurement time. This paper suggests a chirp signal and describes its advantages over other signals. Experimental results demonstrate the effectiveness of this approach.

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Section: A Chirp Excitation Signalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Three-phase AC system impedance measurement unit (IMU) using chirp signal injection

Shen

Jaksic

Mattavelli

et al. 2013

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

View full text Add to dashboard Cite

show abstract

“…Also in medium or high voltage grid, the disturbance injection device should be powerful enough to excite the grid response, which is not cost effective in practice. In order to solve this problem, the passive load, resistive or capacitive, is stepped to generate the grid excitation (Valdivia et al, 2011). Besides, some unique solutions have been presented for grid impedance estimation.…”

Section: Introductionmentioning

confidence: 99%

New grid impedance estimation technique for grid-connected power converters

Guo

Sun

et al. 2014

J Engin Res

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Grid impedance estimation is crucial for operating and controlling of grid-connected converters, especially with the high penetration of renewable energy sources into microgrid and smart grid. One of the technical challenges is how to fast and accurately estimate the grid impedance, even under the distorted and unbalanced conditions. Many impedance estimation methods have been presented in the past decades. Most of them intentionally inject one or more disturbance signals, low frequency or high frequency, to excite the grid response. And then the grid impedance can be estimated by the voltage/current information of two steady-state operating points before and after the disturbance. However, these injected disturbances will deteriorate the power quality due to harmonics caused by the injected disturbances. In order to mitigate the problem, a new impedance estimation method is presented in this paper. Its basic idea lies in the inherent switching feature of the grid-connected power converter. The unique feature is that the proposed new grid impedance can be easily estimated, even under distorted and unbalanced grid voltage conditions with no need of the intentionally injected disturbance signals any more. First of all, the system equivalent impedance circuit is analyzed to clarify the proposed method, along with a theoretical comparison with the conventional one. Aside from that, an interesting estimation of voltage and current switching components are presented for determining the grid impedance with two well-defined equations. And then, the performance tests are carried out and the results verify the effectiveness of the proposed method. Finally, a typical application of the proposed method is presented and discussed.

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“…This concept has even been further extended to address nonlinear behavior [11,12] and EMI [13,14]. Although performing small-signal measurements on the ac converters is not as straightforward due to the time varying steady-state, linearization of ac networks around some desired operating point can be done in rotating d-q coordinates that are in synchronism with the input and/or output frequencies [15][16][17][18]. Smallsignal frequency-domain models can now be obtained by linearization around the desired operating point.…”

Section: Introductionmentioning

confidence: 99%

Un-terminated, low-frequency terminal-behavioral d-q model of three-phase converters

Cvetkovic

Jaksic

Boroyevich

et al. 2011

2011 IEEE Energy Conversion Congress and Exposition

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Frequency-domain terminal-behavioral modeling of ac systems is unquestionably attracting more and more interest in engineering practice. New electronic power distribution systems built for airplanes, ships, electric vehicles, data-centers and even homes, dominantly comprise a variety of power electronics converters with very different dynamic characteristics. If their behavior is not examined carefully before system is integrated, instability can become one of the major concerns. This paper addresses low-frequency terminal-behavioral modeling of three-phase converters which dynamics can be captured on-line, in a non-intrusive way, and later decoupled from the source and load in order to get un-terminated model of a particular converter (or a system). A few examples of different converters are given at the end to verify modeling and decoupling procedure with the average and switching models.

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Impedance Identification Procedure of Three-Phase Balanced Voltage Source Inverters Based on Transient Response Measurements

Cited by 73 publications

References 14 publications

Three-phase AC system impedance measurement unit (IMU) using chirp signal injection

Three-phase AC system impedance measurement unit (IMU) using chirp signal injection

New grid impedance estimation technique for grid-connected power converters

Un-terminated, low-frequency terminal-behavioral d-q model of three-phase converters

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