| 1. |
- Jonasson, Erik, et al.
(författare)
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Design Of Wind-Solar Hybrid Power Plant By Minimizing Need For Energy Storage
- 2023
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- An important aspect in designing co-located wind and solar photovoltaic hybrid power plants is the sizing of the energy converters to achieve as efficient power smoothening as possible. In this study, the ratio of wind- and photovoltaic energy converters in a hybrid power plant is determined by minimizing the overall stored energy that is needed to facilitate constant power output. Using Fourier transform the variability is isolated at predefined time scales that are relevant for grid integration. For the investigated time scales, energy and power ratings for energy storages are determined to counteract the variability. The resulting configuration is the one that is able to achieve constant power output with minimum stored energy. It is shown that co-locating wind- and photovoltaic energy converters smoothen seasonal energy generation, and reduce the energy storage need in both the diurnal and seasonal time scales. A case study for south-eastern Sweden is presented where the wind- \& solar hybrid plant configuration that minimizes the energy storage need and therefore most closely resembles constant output power is determined. It is found that a ratio of approximately 40-45\% wind power in the hybrid power plant yields the lowest need for energy storage. The presented method is valid for any number of co-located energy sources, and can also be extended to sizing of hybrid power systems.
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| 2. |
- Jonasson, Erik, et al.
(författare)
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Discussion of "Assessing temporal complementarity between three variable energy sources through correlation and compromise programming" FA Canales et al. Energy 192 (2020) 116637
- 2023
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Ingår i: Energy. - : Elsevier. - 0360-5442 .- 1873-6785. ; 269
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- This paper discusses the article "Assessing temporal complementarity between three variable energy sources through correlation and compromise programming." The discussed paper proposes a novel method of assessing comple-mentarity between three energy sources using correlation, compromise programming, and normalization. The method is then used to calculate a complementarity index which is applied to a case study in Poland. However, upon inspection, the normalization of the index overestimates the complementarity potential. This issue is dis-cussed in detail in this paper, and an alternative way of calculating the index is proposed, eliminating the issue of overestimating complementarity.
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| 3. |
- Jonasson, Erik, et al.
(författare)
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Grid value of co-located offshore renewable energy
- 2023
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Ingår i: Proceedings of the 15th European Wave and Tidal Energy Conference, Bilbao, 3-7 September 2023. - : European Wave and Tidal Energy Conference.
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Konferensbidrag (refereegranskat)abstract
- Co-locating renewable energy sources such aswave power, solar photovoltaic and wind power, forminga hybrid power plant, may reduce the overall variability,increase the utilization of the transmission system, and reduce the needed physical area. An important topic to address regarding the formation of hybrid power plants is which energy sources to co-locate, and to what proportions these energy sources should be included in the hybrid power plant. In this study, offshore hybrid power plants are analyzed in the North Sea region. By minimizing the plant variability the proportions of each energy source are found, forming the plant with minimal need for energy storage for constant power output operation. The added grid value of such plants is analyzed in terms of electrical infrastructure utilization and power production ramping. It is found that in conditions suitable for the wave energy converter used in the study, a plant configuration of 23% wave power, 22% wind power and 55% solar minimizes the need for energy storage. It is shown that the inclusion of wave power in a hybrid power plant lowers ramping of power generation, increases the capacity factor and provides an overall higher grid value compared to stand-alone installations.
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| 4. |
- Potapenko, Tatiana, et al.
(författare)
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Renewable Energy Potential for Micro-Grid at Hvide Sande
- 2023
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Ingår i: Sustainability. - : MDPI. - 2071-1050. ; 15:3
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Tidskriftsartikel (refereegranskat)abstract
- Decarbonization of ports is a major goal to reduce their global carbon footprint. The port of Hvide Sande is located on the coast of the North Sea in Denmark and it has the potential to utilize various renewable energy sources. Wind and solar thermal parks are already installed there. Wave energy is an alternative to solar and wind energies and its advantage is the spatial concentration, predictability, and persistence. Heat to the town is provided by Hvide Sande Fjernvarme. In this work, it is investigated if the heat demand could be fully covered by renewable energies. Power profiles for each renewable energy resource were calculated using 30 years of re-analysis environmental data. Long, mid, and short term time series of power supply has been statistically and quantitatively examined. Considering the heat demand of Hvide Sande, the lowest frequency of zero occurrence in power generation can be ensured by the combination of wind, solar energy and wave. The article also estimated the capacity for Lithium-ion batteries. The optimal size of the battery is found by the bisection method. Finally, different combinations of renewable energy and demand as well as batteries are evaluated. The lowest zero occurrences in power production is met by the mix of three renewable energies. Also, the mix of three renewable energies significantly reduces the value of energy, required from the battery.
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| 5. |
- Ullah, Md Imran
(författare)
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Control strategies for various grid conditions in wave energy system
- 2023
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The imperative goal of reducing carbon emissions and reaching net zero emissions in electricity generation has driven various renewable technologies, including wind energy, solar energy, and wave energy, among others. Even though wave energy is a recent addition to the already existing renewable energy technologies, it offers distinct advantages, such as a high power density and lower inter-annual variability compared to wind energy. In addition to supplying electric power to the grid, wave energy has the potential to supply power to other applications, such as remote islands or desalination plants. However, one of the primary challenges of wave energy lies in its inherent variability, which poses difficulties in terms of grid integration and can lead to increased current harmonics at its grid connection point. With advancements in power electronic converters and energy storage systems, it has now become feasible to control and manage these variabilities, thereby ensuring higher power quality for grid integration of wave energy. This thesis delves into different power electronic converter controls employed within the electrical network of wave energy converters. It explores the utilization of a hybrid energy storage system comprising a battery and supercapacitor integrated into the DC bus of the electrical network. The wave energy converter electrical network is simulated in MATLAB/Simulink. The results illustrate notable enhancements in power quality at the grid connection point and reduced stress on the battery. Additionally, the system effectively mitigates the intermittent nature of wave power, enabling the provision of constant power to the grid. Furthermore, the thesis delves into the design of grid forming control, specifically designed to electrify islanded loads utilizing a wave energy converter. A multimode converter control is developed for electrifying a remote island modelled as a 10 kW and 1 kVAR load using a wave power park with three wave energy converters. The inverter is controlled in three different modes: grid following, grid supporting and grid forming, which is modelled using MATLAB/Simulink. One of the main issues of using grid following control is the voltage dip at the island’s point of common coupling. A grid support control is implemented with the multimode converter to counteract the voltage dip and restore the voltage to its nominal value. The converter was able to follow the IEEE 519-2022 standard for voltage harmonics and IEEE std 1547 for current harmonics at PCC while supplying the load.
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| 6. |
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| 7. |
- Ullah, Md Imran, et al.
(författare)
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Power quality assessment of a wave energy converter using energy storage
- 2023
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Ingår i: Proceedings of the 15th European Wave and Tidal Energy Conference, Bilbao, 3-7 September 2023. - : European Wave and Tidal Energy Conference.
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Konferensbidrag (refereegranskat)abstract
- Wave energy has been an immense area of interest in research and industry in our move towards a sustainable energy production society due to its high energy density and surface area. However, the grid connection of wave energy converters is still one of the major challenges due to the complexity of varying wave resources (amplitude and frequency). Wave energy converter grid integration can lead to several potential challenges, such as voltage fluctuations, harmonics and flicker. Using an energy storage system can help mitigate a few challenges by balancing the grid demand with the wave energy converter power supply. Hence improving the power quality. This study assesses the power quality of wave energy converters equipped with energy storage against the scenario without any energy storage at different power levels. The power quality in this paper is investigated using total harmonic distortion (THD)of the grid current, dc-link voltage ripple and battery current ripple. The study shows that the addition of a hybrid energy storage system lowers the grid current THDat the point of common coupling (PCC), stabilizes the dc-link voltage ripple and reduces the stress of the battery.
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