Optimal voltage control strategy for grid-feeding power converters in AC microgrids

Chhor, Johnny

doi:10.1016/j.epsr.2019.105945

Cited by 12 publications

(11 citation statements)

References 20 publications

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“…The authors in this study presented an MG central controller composed of two layers of model predictive controllers to compensate for voltage unbalance by adjusting the negative sequence voltage of their buses to keep the overall voltage unbalance of the network below the specified limits. To address the voltage sag event, the authors in [130] proposed an adapted voltage source converter control strategy. Table VIII summarizes the PQ devices, methods, and control strategies used to mitigate the different PQ issues in MG. No effective method or device currently exists to address the SH problem in MG systems; this matter needs more investigation in the future.…”

Section: Other Methods and Control Strategiesmentioning

confidence: 99%

Power Quality in Microgrids Including Supraharmonics: Issues, Standards, and Mitigations

et al. 2020

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A microgrid (MG) is a small-scale power system with a cluster of loads and distributed generators operating together through energy management software and devices that act as a single controllable entity with respect to the grid. MG has become a key research element in smart grid and distribution power systems. MG mainly contains different renewable energy sources (RESs) that use various technological advancements, such as power electronics-based technologies. However, it has an unstable output, thereby causing different types of power quality (PQ) events. As a result, standards and mitigation methods have been developed in recent years. To mitigate PQ issues due to MG integration, various methods and standards have been proposed over the last years. Although these individual methods are well documented, a comparative overview had not been introduced so far. Thus, this study aims to fill the gap by reviewing and comparing the prior-art PQ issues, solutions, and standards in MGs. We compare the main issues related to voltage sag, voltage swell, voltage and current harmonics, system unbalances, and fluctuations to ensure high-quality MG output power. The new technologies associated with MGs generate harmonics emission in the range of 2-150 kHz, thereby causing a new phenomenon, namely, supraharmonics (SH) emission, which is not sufficiently covered in the literature. Therefore, the characteristics, causes, consequences, and measurements of SH are highlighted and analyzed. The mitigation strategies, control, and devices of PQ issues are also discussed. Moreover, a comparison is conducted between the most popular devices used to mitigate the PQ issues in MG in terms of cost, rating, and different aspects of performance. This review study can strengthen the efforts toward the mitigation and standards development of PQ issues in MG applications, especially SH. Finally, some recommendations and suggestions to improve PQ of MG, including SH, are highlighted.

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Section: Other Methods and Control Strategiesmentioning

confidence: 99%

Power Quality in Microgrids Including Supraharmonics: Issues, Standards, and Mitigations

et al. 2020

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“…However, the increase in DG poses many technical issues for distribution systems, as well as amplifying challenges to maintain a stable, reliable, yet affordable power supply, while conventional voltage control devices that have regular control capabilities encounter difficulties with voltage control [37,39,40]. Usually, these issues are related to the drop in voltage amplitude, frequency deviations, and higher harmonic components.…”

Section: Participation Of Power Plants In Voltage and Reactive Power mentioning

confidence: 99%

“…Modern DG systems are connected to AC networks via active-front-end (AFE) power converters. With the increase in their share, power systems with AFE power converters must be provided with additional system services and support measures in the power grid [40,47]. Irrespective of their factual application, they must be engaged in grid voltage and frequency control in line with the national network codes, e.g., regulating wind turbine systems [40].…”

Section: Participation Of Power Plants In Voltage and Reactive Power mentioning

confidence: 99%

“…With the increase in their share, power systems with AFE power converters must be provided with additional system services and support measures in the power grid [40,47]. Irrespective of their factual application, they must be engaged in grid voltage and frequency control in line with the national network codes, e.g., regulating wind turbine systems [40]. First, at the level of DN, power converters will play an increasingly important role aimed at fast and balanced control of voltage and reactive power [47].…”

Section: Participation Of Power Plants In Voltage and Reactive Power mentioning

confidence: 99%

“…They can ensure uninterruptible power supply (UPS) and good quality high output voltage; however, they must have an appropriate power storage system. In contrast, grid-feeding AFE power converters are used to deliver active and reactive power to the already energized grid, whereas active power flow control can be limited to real adjustment [40].…”

Section: Participation Of Power Plants In Voltage and Reactive Power mentioning

confidence: 99%

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Review of Voltage and Reactive Power Control Algorithms in Electrical Distribution Networks

Stanelytė

Radziukynas

2019

Energies

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The traditional unidirectional, passive distribution power grids are rapidly developing into bidirectional, interactive, multi-coordinated smart grids that cover distributed power generation along with advanced information communications and electronic power technologies. To better integrate the use of renewable energy resources into the grid, to improve the voltage stability of distribution grids, to improve the grid protection and to reduce harmonics, one needs to select and control devices with adjustable reactive power (capacitor batteries, transformers, and reactors) and provide certain solutions so that the photovoltaic (PV) converters maintain due to voltage. Conventional compensation methods are no longer appropriate, thus developing measures are necessary that would ensure local reactive and harmonic compensation in case an energy quality problem happens in the low voltage distribution grid. Compared to the centralized methods, artificial intelligence (heuristic) methods are able to distribute computing and communication tasks among control devices.

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Guest editorial introduction to the special issue on “advanced power system and smart integration of renewables”

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et al. 2021

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Optimal voltage control strategy for grid-feeding power converters in AC microgrids

Cited by 12 publications

References 20 publications

Power Quality in Microgrids Including Supraharmonics: Issues, Standards, and Mitigations

Power Quality in Microgrids Including Supraharmonics: Issues, Standards, and Mitigations

Review of Voltage and Reactive Power Control Algorithms in Electrical Distribution Networks

Guest editorial introduction to the special issue on “advanced power system and smart integration of renewables”

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