Studying Voltage Fluctuations in Microgrid with Hybrid Renewable Energy System

Varetsky, Yuriy; Konoval, Volodymyr; Seheda, Mykhailo; Pastuh, Olena

doi:10.1109/ess.2019.8764214

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…The power factor represents how well electrical power is being utilized, and it's another aspect of power quality that can be influenced by DG integration. A low power factor shows wastage in power usage (inefficient) which can further increase due to nonlinear loads and DG contributors in microgrid (Varetsky et al, 2019). Inverters from time to time generate or absorb reactive power which modifies the actual power factor; as a result, it calls for more advanced techniques to manage power effectively (Pilo et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Improving Electrical Energy Distribution

Alshebaney

2024

IAJSE

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The introduction of microgrids is significantly changing the current energy landscape. These microgrids can operate independently or in coordination with the main grid; they are able to integrate a variety of distributed generation (DG) resources, including renewable energy sources such as solar photovoltaics and wind turbines. Although these sources have significant positive environmental and economic impacts, they can cause quite complex power quality problems. These questions revolve around the issue of voltage regulation - an important aspect of maintaining consistent voltage levels within a microgrid, even after fluctuations caused by load or production changes in the DG, including unpredictability due to complexity: not All local systems change correctly. The consistency brought about by the intermittent use of renewable energy sources creates large variations that many local systems are unable to correct for due to the unpredictability and complexity of these factors. Inverters make the situation worse due to the impact on stability - so advanced technologies such as DVR should be used, although higher costs and maintenance requirements may be involved. Harmonics and microgrids with DG: Harmonics are voltage or current waveforms that differ from the fundamental frequency (usually non-linear loads such as inverters cause this distortion) and, among other things, can cause damage to equipment due to Negative Effects: Discusses the high heat generation that harmonic interference can cause, including their ability to affect communications systems. When addressing harmonics specific to PV and wind systems because of operation by inverters: action can be taken against these using advanced inverter designs together with installation of harmonic filters, which limit their passage within the system. Frequency Stability is the task of keeping the system's frequency under control. This task is relatively easy for large centralized generators as they can easily regulate the frequency. However, it becomes a challenging task for microgrids with Distributed Generation (DG), particularly those with renewable sources due to their variability and unpredictability. These factors make it hard for such sources to contribute towards maintaining a stable frequency. As a result, low inertia is a major concern for such systems.... Control strategies should demonstrate high effectiveness in managing balance between what is generated and what is consumed at any point so as not to compromise this stability. Power Factor would be influenced since it indicates how effectively electrical power is being used; another impact after integration includes DG into the system. Deficiencies in power quality often arise from a low power factor that is worsened by loads that are not linear and DG origins. Invertor-based DG systems might deliver or draw reactive power which leads to the modulation of the power factor, impacting overall efficiency in consumption of energy. Illustrations taken from actual case studies can shed light on these issues better. Take the solar microgrid in California, for example, which experienced huge voltage fluctuations due to unstable solar radiation: a problem that was later solved through the successful implementation of a DVR system. Another real-life scenario shows a wind turbine-integrated microgrid in Denmark suffocating from harmonic distortion but being saved by installing harmonic filters. We would also like to draw attention to India's hybrid microgrid (comprising solar PV, wind turbines and diesel generators), which demonstrates that frequency stability can be maintained even with fluctuating renewable energy output through advanced control algorithms - demonstrated A beautiful sight of technical orchestration. Given the shadow of these power quality issues we just revealed, it is highly recommended to implement several mitigation strategies: Microgrid controllers should be part of an advanced control system that dynamically manages power flow, ensuring stability based on real-time data. FACTS should play an important role in power electronic components given its ability to eliminate harmonics and support voltage regulation measures without compromising simplicity or latency. Energy storage systems (ESS) include batteries and supercapacitors: they always prevent the voltage from deviating from the set value when generation or load fluctuations occur. Also acts on frequency stabilization, whereas at expected values it oscillates and itself does not fluctuate in any direction. This text may sound complicated, but bear with me – Grid-Support Technologies is your partner for ensuring power quality. They take care of all the little problems from DVR to UPQC that would otherwise affect your voltage by sagging or distorting with annoying harmonics.

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Section: Introductionmentioning

confidence: 99%

Improving Electrical Energy Distribution

Alshebaney

2024

IAJSE

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“…Due to the unpredictable and rapid changes in electricity generation and sudden loss of power production, the idea of hybrid systems arisen and became one of the most used solutions. Hybrid systems are also useful in remote areas with weak power grids, as they can enhance the quality and consistency of their power supply [14,15]. Hybrid systems can have one or more RESs, conventional power generation units, with or without an energy storage component.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design Methodology of a Novel Integration Topology of Storageless Off-Grid PV Systems

et al. 2022

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In this manuscript, a novel topology is proposed to integrate on-grid and off-grid PV systems supplying the same load premises. The load side is investigated and analyzed, and critical and non-critical loads are separated in terms of power supply. Critical and seasonal loads usually place stress on the grid’s point of common coupling (PCC). In the proposed topology, they are supplied by a novel topology for an off-grid solar pump PV system that lacks energy storage integration. The lack of energy storage batteries requires a novel design and sizing scheme for the off-grid PV system, and a methodology is proposed in this manuscript. The on-grid PV system is conventionally designed and coupled with the storage-less off-grid PV system to maintain load supply. The proposed methodology minimizes the ratings of the PCC and hence relieves stress on congested grids with renewable energy penetration, especially in condensed urban areas. The proposed structure enables the operation of microgrids with high penetration levels of renewable energy resources and minimizes dependance on storage batteries for off-grid systems. A case study is presented and thoroughly analyzed with the proposed methodology. The outcomes of the design process are evaluated economically and were found to be feasible, as is detailed and supported with simulation results.

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“…To overcome this, various papers have investigated the functioning of MG with RES [5,[14][15][16][17], energy storage systems [18][19][20], some advanced ESM strategies designed with dynamic programming [21] and use of EVs in charging stations and V2G design [22][23][24][25][26][27][28][29]. A few works are reported in advanced inverter control structures like adaptive droop control [10,30], proportional-integral (PI) controller [4], fuzzy logic [20,31,32], model predictive controllers [33] for MG control, and so on.…”

Section: Introductionmentioning

confidence: 99%

A Novel Controller Design for Small-Scale Islanded Microgrid Integrated with Electric Vehicle-Based Energy Storage Management

Omar¹,

Tiwari²,

Seethalekshmi³

et al. 2022

International Transactions on Electrical Energy Systems

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Small-scale islanded microgrid technology has the potential to utilize renewable sources for electrification in extreme areas where conventional transmission of power is difficult. But due to the absence of a utility grid in the islanded operation, voltage and frequency control becomes the major concern. Instead of using a centralized large battery storage system, electric vehicle- (EV-) based distributed energy storage may provide a dynamic and much cheaper energy storage solution for small-scale systems in the long run. The only issue is to effectively manage the dynamics of EV penetration for achieving the overall control in the islanded system. To address the same issue, this paper proposes a novel segregation-based inverter control structure for an islanded microgrid while employing EVs as an energy storage system, thus eliminating the need for centralized storage. The designed integrated control structure simultaneously attends to the voltage and frequency regulation need of the system, overcoming the issue of control lag, along with energy storage and management aspects in the microgrid operation for controlling the power flow under various practical scenarios. Extensive experimental studies are performed in MATLAB/SIMULINK environment, which indicates that the proposed integrated control structure gives a satisfactory performance under various scenarios encompassing load variation, renewable energy uncertainties, and EV dynamics in comparison with conventional control schemes employed in the islanded microgrid.

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Studying Voltage Fluctuations in Microgrid with Hybrid Renewable Energy System

Cited by 9 publications

References 9 publications

Improving Electrical Energy Distribution

Improving Electrical Energy Distribution

Analysis and Design Methodology of a Novel Integration Topology of Storageless Off-Grid PV Systems

A Novel Controller Design for Small-Scale Islanded Microgrid Integrated with Electric Vehicle-Based Energy Storage Management

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