D-Q impedance specification for balanced three-phase AC distributed power system

Wen, Bo; Boroyevich, Dushan; Burgos, Rolando; Mattavelli, Paolo; Shen, Z. John

doi:10.1109/apec.2015.7104741

Cited by 13 publications

(14 citation statements)

References 32 publications

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“… Grid-connected inverters embody decoupling controls which significantly reduce the magnitude of the cross terms of their output impedance compared with the terms of the main diagonal [8].  Grid-connected active rectifiers operate as high power factor loads and, as results, the magnitude of the cross terms of their input admittance is significantly reduced with respect to that of the terms of the main diagonal [10], [41]. Under this assumptions, the minor loop gains _ _ ( ) or _ _ ( ) used for stability analysis of grid-connected current-controlled and voltage-controlled inverter systems, respectively, can be simplified as (12) and (13).…”

Section: Small-signal Stability Analysis Of Grid-tied Inverter Symentioning

confidence: 99%

“…They provide only sufficient, but not necessary stability conditions by defining various forbidden regions for the polar plot of the minor loop gain, defined at the power interface between source and load subsystems. The concept of forbidden regions perfectly applies to three-phase AC systems to derive design formulations for a stable interconnected system as demonstrated in [10].…”

Section: Small-signal Stability Analysis Of Grid-tied Inverter Symentioning

confidence: 99%

“…In practice, it is convenient to apply the generalized Nyquist stability criterion to _ _ ( ) or the more conservative criteria to avoid encirclement of the (−1, 0) point [10].…”

Section: Small-signal Stability Analysis Of Grid-tied Inverter Symentioning

confidence: 99%

“…When plotting the impedances of each subsystems connected at the various PCCs, the interaction manifests itself as an impedance magnitude overlap over a certain frequency range. This impedance overlap may bring the system into instability [5]- [10].…”

Section: Introductionmentioning

confidence: 99%

“…In the literature, this stability problem has been explained in two ways. The first explanation considers the destabilizing equivalent negative incremental resistance behaviors of output and input impedance of grid-connected feedback-controlled inverters and active rectifiers, respectively [8]- [10]. The second explanation considers the interaction of the grid-connected converters and their control loops.…”

mentioning

confidence: 99%

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Noninvasive Online Parametric Identification of Three-Phase AC Power Impedances to Assess the Stability of Grid-Tied Power Electronic Inverters in LV Networks

Riccobono

Mirz

Monti

2018

IEEE J. Emerg. Sel. Topics Power Electron.

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Abstract-This paper presents a noninvasive online parametric identification of three-phase AC power impedances to assess small-signal stability of grid-tied inverter systems by using well-known impedance-ratiobased stability criteria. The identification technique is integrated into the control of an existing grid-tied inverter for the estimation of wide bandwidth AC grid impedances, on top of its original power conversion function. This is accomplished in practice by injecting a short-time smallsignal Pseudo Random Binary Sequence (PRBS), a digital approximation of white noise which is wide bandwidth in nature, on the inverter control loop so that all frequencies of interest at the impedance measurement point can be excited at once. Then, digital processing is performed in the integrated control platform where the parametric AC grid impedance is extracted from the measurement of voltage and current over the length of PRBS injection. Moreover, a procedure on how to identify the output impedance of the inverter is deployed so that the parametric source and load impedances can be used to verify the system stability by means of the generalized Nyquist stability criterion. The technique is validated via Hardware In the Loop (HIL) realtime simulation. The present work focuses on the identification of balanced three-phase AC impedances in dq reference frame and a dq diagonal-dominant stability analysis which is typical of LV Distribution Grids.Index Terms-Impedance Measurement, Inverters, Power System Stability, Stability Analysis, Stability Criteria I. INTRODUCTIONThe traditional AC Power System is transforming into a PowerElectronics-based AC Power System due to the deeper This work extends previously presented work at COMPEL 2016.integration of Renewable Energy Sources (RESs) and loads through grid-connected feedback-controlled power electronic. This transformation is schematically depicted in Fig. 1, representing an exemplary low-voltage (LV) radial feeder. In Fig. 1 (a), the traditional AC LV feeder is mainly a passive network because the majority of loads are either AC machines, resistive, or diode rectifiers, fed by the MV/LV transformer. In Fig. 1 (b), the counterpart Power Electronics AC LV feeder is an active network where inverters interface the distributed RESs and active rectifiers interface all the loads. In the situation of Fig. 1 (b), it is also envisioned that the MV/LV conversion will be taken by solid-state transformer technology [4]. As power electronics penetrates the AC grid, a new challenge is raising for both power electronic engineers and power systems engineers. This proliferation of grid-connected power electronics can have a destabilizing effect on the AC voltage due to interactions among grid-connected feedback-controlled power electronic converters and equivalent power grid impedances seen at the various Point of Common Couplings (PCCs) [5]-[11]. In the literature, this stability problem has been explained in two ways. The first explanation considers the destabilizing equivalent negative i...

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Section: Small-signal Stability Analysis Of Grid-tied Inverter Symentioning

confidence: 99%

Section: Small-signal Stability Analysis Of Grid-tied Inverter Symentioning

confidence: 99%

“…In practice, it is convenient to apply the generalized Nyquist stability criterion to _ _ ( ) or the more conservative criteria to avoid encirclement of the (−1, 0) point [10].…”

Section: Small-signal Stability Analysis Of Grid-tied Inverter Symentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Noninvasive Online Parametric Identification of Three-Phase AC Power Impedances to Assess the Stability of Grid-Tied Power Electronic Inverters in LV Networks

Riccobono

Mirz

Monti

2018

IEEE J. Emerg. Sel. Topics Power Electron.

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Assessing High-Order Harmonic Resonance in Locomotive-Network Based on the Impedance Method

Wang

Molinas

et al. 2019

IEEE Access

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Many new types of locomotives are put to use in electric railway systems, resulting in instability problems such as high-order harmonic resonance occurring as a consequence of the interaction between the electrical locomotive (including electrical multiple units) and the traction network. In order to investigate this problem, this paper adopts the impedance-based approach to analyze the stability properties of the system interaction. The detailed impedance of the traction network is obtained by taking its distributed parameters into account. Then the locomotive converter with single-phase transient current control algorithm (TCCA), which can represent the locomotive when performing the impedance-based stability analysis, is modeled as the dq-frame impedance by single-phase dq decomposition. By plotting bode diagrams of the impedance for the traction network and the locomotive separately, and calculating the phase margin at the intersection point of the magnitude of the two impedances, the stability of the locomotive-network system is evaluated and thus the high-order harmonic resonance can be predicted. Moreover, a time-domain model of locomotivenetwork systems is established in this paper, which can reproduce the high-order harmonic resonance in the time domain as a first validation step of the analysis. Finally, a field test in a traction substation of the Beijing-Harbin Railway is carried out to finally validate the effectiveness of the proposed method. The stability analysis method in this paper is simple and effective without the need for a complex calculation of some norms or Eigenvalues. As a result, the high-order harmonic resonance can be predicted before a new type of locomotive is put into use.

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The Generalized Nyquist Criterion Applied to Complex DC Power System Networks

Plesnick

Berardino

Irwin

2019

2019 IEEE Electric Ship Technologies Symposium (ESTS)

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D-Q impedance specification for balanced three-phase AC distributed power system

Cited by 13 publications

References 32 publications

Noninvasive Online Parametric Identification of Three-Phase AC Power Impedances to Assess the Stability of Grid-Tied Power Electronic Inverters in LV Networks

Noninvasive Online Parametric Identification of Three-Phase AC Power Impedances to Assess the Stability of Grid-Tied Power Electronic Inverters in LV Networks

Assessing High-Order Harmonic Resonance in Locomotive-Network Based on the Impedance Method

The Generalized Nyquist Criterion Applied to Complex DC Power System Networks

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