Sizing of Energy Storage Systems for Photovoltaic–Wind Power Plants
Talvi, Micke (2023)
2023
Ympäristö- ja energiatekniikan DI-ohjelma - Programme in Environmental and Energy Engineering
Tekniikan ja luonnontieteiden tiedekunta - Faculty of Engineering and Natural Sciences
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Hyväksymispäivämäärä
2023-08-16
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202308147574
https://urn.fi/URN:NBN:fi:tuni-202308147574
Tiivistelmä
As the share of highly volatile photovoltaic (PV) and wind power generation increases in power grids, there is an increasing need to level their power fluctuations. The power fluctuations from PV and wind power plants can be extremely rapid, and the stability of the power grid is endangered. To prevent these problems, some countries have set ramp rate (RR) limits that the output powers of power plants must not exceed.
One solution to mitigate the power fluctuations of a power plant is to equip the power plant with an energy storage system (ESS). The topic of this thesis is to investigate the power fluctuations of PV–wind power plants and to discover the required sizes for the ESSs that are coupled with the power plants. The goal of this thesis was to investigate how the size of the centralized ESS for the PV–wind power plant differs from the sizes of the ESSs for the separate PV and wind power plants. This investigation was done for the small- and large-scale PV–wind power plants.
It was also investigated that how the different levels of nominal PV and wind power affect the required size of the centralized ESS. The ESSs of this thesis were virtual and the output powers of the power plants were modeled based on climatic measurements done at Tampere University Solar PV Power Station Research Plant in Finland. The measured quantities were irradiance, PV module backside temperature, wind speed and ambient temperature.
The modeled PV and wind powers seemed to match the literature well. It was found that the required size of the ESS for the PV power plant is larger than for the wind power plant in the small- and large-scale investigations. It was also found that on general, the relative size of the centralized ESS of the PV–wind power plant is smaller than the relative sizes of the separate ESSs of the PV and wind power plants. When the nominal PV power was scaled in contrast to the nominal wind power, it was found that the required relative energy and power capacities of the centralized ESS are the smallest when the scaling coefficients for the nominal PV power were 0.45 and 0.35, respectively.
One solution to mitigate the power fluctuations of a power plant is to equip the power plant with an energy storage system (ESS). The topic of this thesis is to investigate the power fluctuations of PV–wind power plants and to discover the required sizes for the ESSs that are coupled with the power plants. The goal of this thesis was to investigate how the size of the centralized ESS for the PV–wind power plant differs from the sizes of the ESSs for the separate PV and wind power plants. This investigation was done for the small- and large-scale PV–wind power plants.
It was also investigated that how the different levels of nominal PV and wind power affect the required size of the centralized ESS. The ESSs of this thesis were virtual and the output powers of the power plants were modeled based on climatic measurements done at Tampere University Solar PV Power Station Research Plant in Finland. The measured quantities were irradiance, PV module backside temperature, wind speed and ambient temperature.
The modeled PV and wind powers seemed to match the literature well. It was found that the required size of the ESS for the PV power plant is larger than for the wind power plant in the small- and large-scale investigations. It was also found that on general, the relative size of the centralized ESS of the PV–wind power plant is smaller than the relative sizes of the separate ESSs of the PV and wind power plants. When the nominal PV power was scaled in contrast to the nominal wind power, it was found that the required relative energy and power capacities of the centralized ESS are the smallest when the scaling coefficients for the nominal PV power were 0.45 and 0.35, respectively.