Improving Transient Stability of Power Synchronization Control for Weak Grid Applications

Sepehr, Amir; Pouresmaeil, Mobina; Hojabri, Mojgan; Blaabjerg, Frede; Pouresmaeil, Edris

doi:10.1109/compel49091.2020.9265786

Cited by 5 publications

(12 citation statements)

References 16 publications

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“…The particular situation in which the zeros reach to the origin is when δ = ±π/2; Thus, sufficient bandwidth and gain can not be achieved when the operating point of the converter is close to δ = ±π/2. [15].…”

Section: Principles Of Pscmentioning

confidence: 99%

“…Moreover, the authors in [14] developed models for the transient stability assessment of gridtied converters exposed to severe grid faults. Finally, the study in [15] presents a modified PSC by adding dc component suppressing capability and a back-calculation anti-windup for the synchronization loop to address the transient stability of PSC at the time of short-circuit faults in weak grids.…”

Section: Introductionmentioning

confidence: 99%

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Employing Machine Learning for Enhancing Transient Stability of Power Synchronization Control During Fault Conditions in Weak Grids

Sepehr

Gomis‐Bellmunt

Pouresmaeil

2022

IEEE Trans. Smart Grid

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Section: Principles Of Pscmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Employing Machine Learning for Enhancing Transient Stability of Power Synchronization Control During Fault Conditions in Weak Grids

Sepehr

Gomis‐Bellmunt

Pouresmaeil

2022

IEEE Trans. Smart Grid

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“…Mitigation of the undamped resonances can be achieved by studying and analyzing the output impedance and damping characteristics of the converters. Furthermore, in power electronics dominated power systems, the emulation of synchronous machine dynamics by power converters has become an evolving concept [5]. Synchronous machines provide synchronizing torque, damping, and inertia as the main ancillary support during disturbances in power systems [5].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, in power electronics dominated power systems, the emulation of synchronous machine dynamics by power converters has become an evolving concept [5]. Synchronous machines provide synchronizing torque, damping, and inertia as the main ancillary support during disturbances in power systems [5]. Accordingly, various control schemes based on synchronous machine principles have been developed for weak grid applications.…”

Section: Introductionmentioning

confidence: 99%

“…Accordingly, various control schemes based on synchronous machine principles have been developed for weak grid applications. In this respect, power synchronization control scheme (PSCS), which is a voltage-stiff control scheme, has been proposed to emulate the dynamic response and features of synchronous machines with robust control on voltage and frequency to deal with the dynamic issues of weak grids [5], [6]. Particularly, PSCS represents a viable solution that allows transferring power between remote points of the grid and demonstrates technical advantages in high-impedance-grid applications [6].…”

Section: Introductionmentioning

confidence: 99%

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Harmonic Stability Analysis of Grid-Connected Converters with Power Synchronization Control

Sepehr

Pouresmaeil

2021

2021 IEEE PES Innovative Smart Grid Technologies Europe (ISGT Europe)

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Integration of power electronic-based renewable energy sources into weak grids brings new concerns regarding the harmonic stability of modern power systems. This paper studies harmonic stability and impedance characteristics of power synchronization control (PSC) which has been introduced for control of converters under weak grid operating condition. Due to the varying grid impedance in weak grids, the harmonic stability of converters with LCL output filters would be a demanding prospect. Thus, this paper addresses this issue by studying the admittance characteristics of PSC based on the dynamics of the control scheme, the delay and the sampling frequency of the control system, and the linearized model of the grid-connected converter. Finally, the critical grid inductance and the sufficient conditions for achieving harmonic stability are introduced. Time-domain simulations are carried out to support the proposed harmonic stability analysis.

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Observer-Based Power-Synchronization Control for Grid-Forming Converters

Nurminen,

Mourouvin,

Hinkkanen

et al. 2023

2023 IEEE Belgrade PowerTech

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Renewable energy sources connected to the grid via power converters are becoming increasingly common. Currently, most of these power converters are of the gridfollowing type that follow the frequency and voltage set by synchronous generators connected to the grid. Large scale adoption of these would put the stability of the grid at risk and thus their allowable amount is limited. A potential solution to this is the adoption of grid-forming control schemes that allow converters to set their own frequency and voltage references and thus no longer be reliant on synchronous generators. Power synchronization control (PSC) is one such method with two prominent versions, conventional PSC and reference-feedforward PSC (RFPSC). These two methods are, however, heuristic in design and a more coherent approach is more desirable. This thesis develops a novel observer-based PSC (OPSC) method for the control of grid-forming converters equipped with an L filter. Recommendations for the tuning of OPSC are developed based on the stability analysis of its linear model. Comparisons between RFPSC and OPSC are made based on their linear models and significant similarities between the two are found. Simulations are used to study the performance of conventional PSC, RFPSC and OPSC. RFPSC and OPSC are found to have not only excellent performance but also react in a very similar manner to changes in the output power reference when correct tuning is used. The potential for using LCL filters with OPSC is also confirmed using simulations. The performance of the three PSC-based methods is confirmed experimentally by means of a laboratory setup that includes physical converters and a real-time control system.

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Improving Transient Stability of Power Synchronization Control for Weak Grid Applications

Cited by 5 publications

References 16 publications

Employing Machine Learning for Enhancing Transient Stability of Power Synchronization Control During Fault Conditions in Weak Grids

Employing Machine Learning for Enhancing Transient Stability of Power Synchronization Control During Fault Conditions in Weak Grids

Harmonic Stability Analysis of Grid-Connected Converters with Power Synchronization Control

Observer-Based Power-Synchronization Control for Grid-Forming Converters

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