Small-Signal Stability Analysis of Interaction Modes in VSC MTDC Systems with Voltage Margin Control

Grdenić, Goran; Delimar, Marko

doi:10.3390/en10070873

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…The frequency dependency of line series parameters (inductance and resistance) in state-space models can be accounted for by using the vector fitting algorithm [17,18]. The impetus for the application of FD line models has come from dc grids [19,20] since the interactions between converters can occur at relatively high frequencies and resonances of dc cables (which are not limited by the length) can appear at relatively low frequencies. State-space compatible cable models enable the use of powerful modal analysis for the investigation and mitigation of interaction phenomena.…”

Section: Frequency-dependent State-space Positive-sequence Ac Line Mo...mentioning

confidence: 99%

AC Grid Model Order Reduction Based on Interaction Modes Identification in Converter-Based Power Systems

Delimar

Beerten

2023

IEEE Trans. Power Syst.

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Increasing application of power electronics devices (inverter-based generation and storage, HVDC lines, FACTS devices), facilitated by growing renewable energy integration, has also changed the ac grid modeling features. Namely, the incorporation of fast-acting control devices can lead to possible detrimental interactions that appear at much higher frequencies compared to synchronous generator-based power systems. In this regard, the phasor-based ac grid model is no longer adequate, putting forward the ac line models with extended validity in the frequency range. However, modeling all the lines in a system in high-frequency resolution requires high computational power and is often not necessary either. To overcome this challenge, this paper proposes the methodology for model order reduction (MOR) of an ac grid that enables a systematic identification of more significant lines in the system from the stability perspective and the necessary level of their model complexity. The methodology is established on subsystem participation calculation and the analysis of interaction modes between power electronics devices and a particular line. Thereat, the vector fitting algorithm is employed to obtain the high bandwidth state-space compatible ac line models. The functionalities and effectiveness of the proposed MOR methodology are demonstrated on a 9-bus test system.

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Section: Frequency-dependent State-space Positive-sequence Ac Line Mo...mentioning

confidence: 99%

AC Grid Model Order Reduction Based on Interaction Modes Identification in Converter-Based Power Systems

Delimar

Beerten

2023

IEEE Trans. Power Syst.

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“…The dynamic performance of both systems are then compared by means of small-signal analysis. The model of the VSCs refers to the time-averaged models in [12], [13].…”

Section: Case Studymentioning

confidence: 99%

Evaluation of the use of short-circuit ratio as a system strength indicator in converter-dominated power systems

Damanik

Sakinci

Grdenić

et al. 2022

2022 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)

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This paper investigates the applicability of shortcircuit ratio (SCR) as a system strength indicator in power systems with a high penetration of voltage source converters (VSCs). In power systems dominated by synchronous generators, the SCR has been widely used to estimate the system strength by using short-circuit level information obtained at the relevant bus. However, the emerging converter technology such as VSCs has different short-circuit characteristics from synchronous generators, in the sense that the short-circuit currents are typically lower in magnitude and more controllable. Moreover, SCR calculations are based on the static analysis of the power system, neglecting the dynamic and control aspects of VSCs. These aspects raise the question whether the SCR can still be used to evaluate system strength of converter-dominated systems. To this end, in this paper, the fundamental definition of the SCR is revisited, and factors influencing its applicability in converter-dominated power systems are listed. A case study is provided to demonstrate the limitation of the SCR in converter-dominated systems, and the impact of the control strategy on the dynamic performance of the system is also discussed.

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Multi-Terminal HVDC System With Offshore Wind Farms Under Anomalous Conditions: Stability Assessment

2021

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Droop control is widely adopted to control Multi-Terminal high-voltage Direct Current (MTDC) systems with offshore wind farms. During permanent faults, the faulty line should be isolated promptly to preserve a high reliability of the MTDC system. This paper examines the MTDC system performance following a faulty line outage. This study aims to identify the outage types that may lead to a complete loss of system voltage stability and the outages that may have a secondary effect on the system. Moreover, strategies for dealing with outages that may lead to a complete shutdown of the system are also presented. Furthermore, the ranges of droop gains' values that can be employed following fault occurrence to preserve system transient stability are studied. Different scenarios are explored during faulty conditions such as surplus and sparsity of wind power, line overcurrent, outage of lines connected to wind farms, and outage of lines connected to AC grids to validate this study. MATLAB/Simulink platform has been employed to elucidate the presented concept.

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Small-Signal Stability Analysis of Interaction Modes in VSC MTDC Systems with Voltage Margin Control

Cited by 4 publications

References 19 publications

AC Grid Model Order Reduction Based on Interaction Modes Identification in Converter-Based Power Systems

AC Grid Model Order Reduction Based on Interaction Modes Identification in Converter-Based Power Systems

Evaluation of the use of short-circuit ratio as a system strength indicator in converter-dominated power systems

Multi-Terminal HVDC System With Offshore Wind Farms Under Anomalous Conditions: Stability Assessment

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