Voltage Support under Grid Faults with Inherent Current Limitation for Three-Phase Droop-Controlled Inverters

Paspatis, Alexandros; Konstantopoulos, George C.

doi:10.3390/en12060997

Cited by 9 publications

(7 citation statements)

References 35 publications

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“…In [14], Paspatis et al propose and analyze a novel nonlinear current-limiting controller for three-phase grid-tied droop-controlled inverters that is capable of offering voltage support during balanced and unbalanced grid voltage drops. The proposed controller introduces a unified structure under both normal and abnormal grid conditions operating as a droop controller or following the recent fault-ride-through requirement to provide voltage support.…”

Section: Published Papers Highlightsmentioning

confidence: 99%

Modern Power System Dynamics, Stability and Control

Alexandridis¹

2020

Energies

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This Special Issue of Energies, “Modern Power System Dynamics, Stability and Control”, addresses the core problem of deploying novel aspects in the analysis of modern power systems as these are composed after the high penetration of distributed generation (DG) with different renewable energy sources (RES). The focus is given either on the new whole power and control system configuration or on individual cases of DG sources, power converters and other general or specific plants and devices. The problem can be tackled with different methodologies and may have several, more or less valuable and complicated solutions. The twenty-three accepted papers certainly offer a good contribution in a wide range of applications; they are extended from basic system theory perspectives, fundamental nonlinear analysis tools and novel modeling deployments to some interesting particular system and control issues.

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Section: Published Papers Highlightsmentioning

confidence: 99%

Modern Power System Dynamics, Stability and Control

Alexandridis¹

2020

Energies

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“…So, apart from the current limitation, a grid-connected inverter should have voltage support capability when faults occur at the grid in terms of positive sequence voltage increase and negative sequence voltage elimination [31]. This last requirement is not met in this case.…”

Section: Simulation Results: Tvi Threshold With Ipeak Based Sequence Separation (Second Method)mentioning

confidence: 99%

Enhanced TVI for Grid Forming VSC under Unbalanced Faults

Zubiaga

Cardozo²,

Prevost³

et al. 2021

Energies

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With an increasing capacity of inverter-based generation and with a 100% renewable energy power system on the horizon, grid forming converters have the potential to become the prevalent control mode in the grid. Thus, the correct performance of these devices is going to be crucial for system stability and security of supply. Most research related to the grid-forming control is focused on normal operating conditions, although significant effort has been devoted to current limitation strategies to ensure Low Voltage Ride Through (LVRT) capability. However, most contributions usually consider only balanced faults. This paper, proposes a new current limiting method based on the well-known threshold virtual impedance (TVI) that keeps the voltage source behaviour associated to the grid forming (GFM) capability, even when the current limit is reached, while reducing the voltage unbalance according to user-defined settings.

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“…where ω θ =  g g is the grid angular frequency; ω * and * V are the rated frequency and rated RMS voltage, respectively; i L is the inverter filter inductance; and vi r is a virtual resistance introduced by the controller. For the rest of the controller gains and parameters, as well as the controller analysis, the reader is referred to [59]. It is underlined that the unit-level control in Equations (7)-(12) matches the generic form of Equations (2) and 3, where…”

Section: Cps-based Power System Examplementioning

confidence: 97%

“…Then, the currents injected from each DER unit and the In the ADEPT system, a novel unit-level control structure is utilized where each inverterinterfaced DER unit is required to provide grid support through droop control implementation and additionally guarantees an inherent current limitation to protect each inverter from high currents under extreme scenarios (e.g., grid faults and unrealistic power demands from supervisory control). This novel current-limiting unit-level control design can be found in [59], where the duty-ratio control inputs of each DER unit inverter were defined as:…”

Section: Cps-based Power System Examplementioning

confidence: 99%

Towards the Integration of Modern Power Systems into a Cyber–Physical Framework

2020

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The cyber–physical system (CPS) architecture provides a novel framework for analyzing and expanding research and innovation results that are essential in managing, controlling and operating complex, large scale, industrial systems under a holistic insight. Power systems constitute such characteristically large industrial structures. The main challenge in deploying a power system as a CPS lies on how to combine and incorporate multi-disciplinary, core, and advanced technologies into the specific for this case, social, environmental, economic and engineering aspects. In order to substantially contribute towards this target, in this paper, a specific CPS scheme that clearly describes how a dedicated cyber layer is deployed to manage and interact with comprehensive multiple physical layers, like those found in a large-scale modern power system architecture, is proposed. In particular, the measurement, communication, computation, control mechanisms, and tools installed at different hierarchical frames that are required to consider and modulate the social/environmental necessities, as well as the electricity market management, the regulation of the electric grid, and the power injection/absorption of the controlled main devices and distributed energy resources, are all incorporated in a common CPS framework. Furthermore, a methodology for investigating and analyzing the dynamics of different levels of the CPS architecture (including physical devices, electricity and communication networks to market, and environmental and social mechanisms) is provided together with the necessary modelling tools and assumptions made in order to close the loop between the physical and the cyber layers. An example of a real-world industrial micro-grid that describes the main aspects of the proposed CPS-based design for modern electricity grids is also presented at the end of the paper to further explain and visualize the proposed framework.

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Voltage Support under Grid Faults with Inherent Current Limitation for Three-Phase Droop-Controlled Inverters

Cited by 9 publications

References 35 publications

Modern Power System Dynamics, Stability and Control

Modern Power System Dynamics, Stability and Control

Enhanced TVI for Grid Forming VSC under Unbalanced Faults

Towards the Integration of Modern Power Systems into a Cyber–Physical Framework

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