Online Parametric Identification of Power Impedances to Improve Stability and Accuracy of Power Hardware-in-the-Loop Simulations

Riccobono, Antonino; Liegmann, Eyke; Pau, Massimiliano; Ponci, Ferdinanda; Monti, Antonello

doi:10.1109/tim.2017.2706458

Cited by 40 publications

(24 citation statements)

References 23 publications

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“…Yet, this work does not explain how to obtain the synchronization angle and the effect of synchronization dynamics on the impedance measurement results. An oscillator that is synchronized to the grid voltage was adopted to generate the synchronization phase used for the impedance calculation [10], [11]. Applying the Fast Fourier Transform (FFT) to the grid voltage, the phase information can be calculated directly [12].…”

Section: Index Terms-small-signal Model Synchronization Impedance Mmentioning

confidence: 99%

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Impact Analysis and Mitigation of Synchronization Dynamics for DQ Impedance Measurement

Gong

Yang

Wang

2019

IEEE Trans. Power Electron.

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Section: Index Terms-small-signal Model Synchronization Impedance Mmentioning

confidence: 99%

“…On the other hand, it has to be sufficiently large to reject noise disturbances. In general, the magnitude of the excitation signal is chosen between 5% and 10% of steady-state values [10], [11].…”

Section: B Impedance Measurement Procedures and Algorithmmentioning

confidence: 99%

Impact Analysis and Mitigation of Synchronization Dynamics for DQ Impedance Measurement

Gong

Yang

Wang

2019

IEEE Trans. Power Electron.

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“…Analytic expressions of the grid impedance can be calculated from (18) to (20) and can be found in Appendix. Two cases are under consideration, namely Case 1 and Case 2 whose circuital parameters are given in Table II.…”

Section: B Grid Impedancementioning

confidence: 99%

“…In theory, the maximum identifiable frequency is defined by the Nyquist frequency, i.e. half the switching frequency of the inverter [14]- [20]. The lower frequency boundary, instead, is equal to the inverse of the measured time window during which the PRBS is injected.…”

Section: Performance Of the Wsi Technique And Overcoming Practicalmentioning

confidence: 99%

“…With respect to previously presented work by the authors [19], where the identification focused on the phase domain, this paper presents the online parametrization of the identified grid impedance in dq domain. Real-time parametric identification was recently presented by the authors [20], but with the different goal of improving stability and accuracy of a Power Hardware in the Loop setup and only considering passive DC impedances. This paper extends the identification to three-phase AC impedances.…”

Section: Introductionmentioning

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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Development of Power Hardware-in-the-Loop Simulation Test-bed to Verify LVDC Grid Stability Using Offline Damping Impedance Design

Lim,

Heo,

Jeon

et al. 2024

J. Electr. Eng. Technol.

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Online Parametric Identification of Power Impedances to Improve Stability and Accuracy of Power Hardware-in-the-Loop Simulations

Cited by 40 publications

References 23 publications

Impact Analysis and Mitigation of Synchronization Dynamics for DQ Impedance Measurement

Impact Analysis and Mitigation of Synchronization Dynamics for DQ Impedance Measurement

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

Development of Power Hardware-in-the-Loop Simulation Test-bed to Verify LVDC Grid Stability Using Offline Damping Impedance Design

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