Black-Box Impedance Prediction of Grid-Tied VSCs Under Variable Operating Conditions

Qiu, Qi; Huang, Yifan; Ma, Rui; Kurths, Jürgen; Zhan, Meng

doi:10.1109/access.2021.3139435

Cited by 10 publications

(2 citation statements)

References 36 publications

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“…Each element of the GFLI's admittance matrix Y mat gfli,dq can be formulated in the polynomial transfer function form as [7]…”

Section: Generalization Of Gflis' Admittance Modelsmentioning

confidence: 99%

Operating-point-parameterized State-space Models of Black-boxed Grid-following Inverters for Maximum Transferable Active Power Prediction

Zhou,

Mohammed,

Bahrani

2024

Preprint

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This letter, based on measuring the admittance of a black-boxed grid-following inverter (GFLI) at seven distinct operating points to synthesize an operating-point-parameterized state-space model (OPP SSM), presents an efficient method for analytical prediction of the maximum transferable active power (MTAP) injected by the black-boxed GFLI into the grid under any arbitrary grid condition and reactive power injection level. The proposed method obviates the need for repetitive electromagnetic transient time-domain simulations or frequency-domain impedance criteria by gradually increasing active power output until the MTAP is reached. The feasibility of the synthesized OPP SSM for MTAP prediction has been experimentally validated on a power-controlled GFLI, demonstrating its potential for aiding the integration of inverter-based resources in modern power systems.

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“…Each element of the GFLI's admittance matrix Y mat gfli,dq can be formulated in the polynomial transfer function form as [7]…”

Section: Generalization Of Gflis' Admittance Modelsmentioning

confidence: 99%

Operating-point-parameterized State-space Models of Black-boxed Grid-following Inverters for Maximum Transferable Active Power Prediction

Zhou,

Mohammed,

Bahrani

2024

Preprint

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“…regarding the above three aspects were achieved in [6], the proposed method requires at least 28 admittance data points, which increases the burden in acquiring the required data. An artificial neural network was employed in [7] to build the nonlinear relationship between the admittance model and operating points.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Method to Estimate Admittance of Black-boxed Inverter-based Resources for Varying Operating Points

Zhou,

Liu,

Mohammed

et al. 2023

Preprint

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<p>Admittance frequency responses of inverter-based resources (IBRs) are typically measured in the electromagnetic transient simulation or lab environments when their internal structures and parameters are unknown. Nevertheless, such ad?mittance measurements must be performed repeatedly when the operating point changes, since various non-linear control loops make the IBRs’ admittance models operating-point dependent. To avoid the time-consuming and cumbersome measurements, this letter presents a simple and efficient admittance estimation method for black-boxed IBRs, where the admittance at any arbitrary operating point can be estimated using as few as seven measured admittance data points. Case studies demonstrate that the proposed approach is efficient on various types of IBRs, including both grid-following and grid-forming inverters. The estimation accuracy is satisfying even when non-negligible measurement errors exist. </p>

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Synchronization stability and multi-timescale analysis of renewable-dominated power systems

Ma,

Zhang,

Han

et al. 2023

Chaos: An Interdisciplinary Journal of Nonlinear Science

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Synchronization is one of the key issues in three-phase AC power systems. Its characteristics have been dramatically changed with the large-scale integration of power-electronic-based renewable energy, mainly including a permanent magnetic synchronous generator (PMSG) and a double-fed induction generator (DFIG) for wind energy and a photovoltaic (PV) generator for solar energy. In this paper, we review recent progresses on the synchronization stability and multi-timescale properties of the renewable-dominated power system (RDPS), from nodes and network perspectives. All PMSG, DFIG, and PV are studied. In the traditional synchronous generator (SG) dominated power system, its dynamics can be described by the differential–algebraic equations (DAEs), where the dynamic apparatuses are modeled by differential equations and the stationary networks are described by algebraic equations. Unlike the single electromechanical timescale and DAE description for the SG-dominated power system, the RDPS dynamics should be described by the multiscale dynamics of both nodes and networks. For three different timescales, including the AC current control, DC voltage control, and rotor electromechanical timescales, their corresponding models are well established. In addition, for the multiscale network dynamics, the dynamical network within the AC current control timescale, which should be described by differential equations, can also be simplified as algebraic equations. Thus, the RDPS dynamics can be put into a similar DAE diagram for each timescale to the traditional power system dynamics, with which most of power electrical engineers are familiar. It is also found that the phase-locked loop for synchronization plays a crucial role in the whole system dynamics. The differences in the synchronization and multiscale characteristics between the traditional power system and the RDPS are well uncovered and summarized. Therefore, the merit of this paper is to establish a basic physical picture for the stability mechanism in the RDPS, which still lacks systematic studies and is controversial in the field of electrical power engineering.

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Black-Box Impedance Prediction of Grid-Tied VSCs Under Variable Operating Conditions

Cited by 10 publications

References 36 publications

Operating-point-parameterized State-space Models of Black-boxed Grid-following Inverters for Maximum Transferable Active Power Prediction

Operating-point-parameterized State-space Models of Black-boxed Grid-following Inverters for Maximum Transferable Active Power Prediction

An Efficient Method to Estimate Admittance of Black-boxed Inverter-based Resources for Varying Operating Points

Synchronization stability and multi-timescale analysis of renewable-dominated power systems

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