This paper proposes a residential peer-to-peer (P2P) energy trading market for prosumers with battery storage systems. To this end, a P2P energy trading mechanism, including the rules for buying and selling energy, is presented. In addition, the supply function bidding method is adopted to match the power supply imbalance and calculate the market-clearing price. Based on the proposed model, a single-objective optimization problem is designed to minimize the total energy cost of all prosumers. To avoid the unfair benefit distribution for market participants, we further put forward a multiobjective optimization problem to solve the issue and reduce the total energy cost as much as possible. The simulation results validate and compare the performance on cost reduction of the proposed two optimization problems.
Energy efficiency and environmental performance become important aspects of all transportation branches involving diesel engines as prime movers. The same is for the fishing sector, where besides ensuring sustainability, one seeks for minimizing operative costs through the reduction of fuel consumption. Ship emissions can be determined at different levels of complexity and accuracy, i.e. by analysing ship technical data and assuming its operative profile, or by direct measurements of key parameters and their postprocessing to obtain exact amounts of exhaust gases. This paper deals with the analysis of the environmental footprint of a fishing trawler operating in the Adriatic Sea, including both Well-to-Pump (WTP) and Pump-to-Wake (PTW) phases of the fuel. Based on the data on fuel consumption and exploitation scenarios of the considered ship, provided by the ship-owner, the ship emissions have been determined. Also, a review of different emission reduction technologies has been provided Among various alternatives to diesel enginepowered fishing vessels a hydrogen-powered option is considered, where the obtained results show that hydrogen is rather far from application in the Croatian fishing sector.
Due to the intermittence of renewable energy and its large-scale access in the power grid, frequency stability control faces severe challenges. To address this issue, this paper considers gas-thermal inertia in the integrated energy system (IES) to provide frequency response. Due to their similar slow dynamic characteristics, this paper gives detailed explanations on power support characteristics of gas-thermal inertia, based on which presents a new method to provide frequency response in IES. The proposed method is tested in an actual scenario and the advantages of considering gas-thermal inertia are verified.
As an energy vector, hydrogen faces bulk storage and transportation challenges due to its low volumetric energy density. Following the footsteps of liquefied natural gas, hydrogen is also liquefied prior to transportation. Liquid nitrogen is usually used as the refrigerant in the precooling cycle; however, alternate candidates are also being studied. Liquid air, which is already drawing attention as a standalone cryogenic energy storage system, is one such candidate as enormous cold energy is available in its regasification phase or the discharge half-cycle. In the present study, liquid air is considered the refrigerant stream in the precooling section of the hydrogen liquefaction process. A well-known commercial simulator Aspen HYSYS® v12.1 is used for this unique concept’s design and performance analysis. Composite curves analysis is performed to analyze the proposed integrated scheme’s performance graphically. The specific energy consumption of 8.52 kWh/kg LH2 has been obtained in the unoptimized base case.
The decarbonisation targets of the People’s Republic of China are ambitious, and their achievement relies on large-scale deployment of variable renewable energy sources (VRES), such as wind and solar. High penetration of VRES may lead to balancing problems on the grid, that can be compensated by increasing the shifting flexibility capacity of the system, i.e. installing additional electricity storage. Pumped Hydro Storage (PHS) is the most diffused electricity storage technology at the global level, and the only fully mature solution for long-term electricity storage. China has already the highest PHS capacity installed worldwide, and it is planning to strongly increase it before 2030. The present study, based on the data available from the “Pumped Storage Tracking Tool” of the International Hydropower Association, investigates the potential of technology improvement of the existing and future PHS fleet in China, aiming to the adoption of advanced PHS solutions able to better cope with the task of balancing the VRES production. Furthermore, policy recommendations are elaborated to promote, facilitate and support the adoption of these advanced PHS solutions.
Hydropower has historically dominated Brazil’s power system, leaving the country’s energy supply vulnerable to extreme hydrological variations. Brazil will embrace an energy system that integrates more solar and wind resources to diversify its energy mix and further mitigate carbon emissions.
To explore this, we present PyPSA-Brazil, a novel model based on publicly accessible data and the PyPSA modelling framework. The modelling of the cost-optimal system incorporates a simplified grid with one node per federal state to optimize the operation and expansion of generation, storage, and transmission for all hours of the year. To demonstrate PyPSA-Brazil, a case study that depicts the limits on transmission grid expansion is exemplarily evaluated. Expanding today’s lines by 175% could help Brazil to achieve a zero-emissions energy system, but this may require additional flexible capacity beyond the existing and planned hydro and biomass power plants. Further investment is particularly needed to expand the transmission between the new renewable energy production centres in the north-east and south of Brazil and the consumption hotspots in the south-east.
Buildings are accountable around 30-40% of global energy consumption. The modern designs of building with significantly large size of glazed façade are trending and liked by the owner and designers. However, their energy and indoor visual performances are required to be investigated thoroughly. This study assessed the most significant design parameters for south glazed façade office in composite climate of Amritsar in India. The influential parameters have been identified through uncertainty and sensitivity analysis for energy and indoor visual performances. The WWR, ASR, Gt and ST have been identified major and common design parameters that influence the performance of buildings. However, their contributions vary with the performance parameters.
Hydrogen (H2) is a clean energy carrier that has the potential to reduce carbon emissions. Currently, H2 is being produced from fossil fuels. The major drawback of fossil-based H2 production is the production of CO2 and other impurities along with it. H2 rich syngas has gained attention recently. In syngas, H2 is the main component along with carbon dioxide, carbon monoxide, and nitrogen. To separate and purify H2, the pressure swing adsorption (PSA) method is adopted. PSA can produce high purity H2 but with low recovery. In this study, membrane and cryogenic distillation-based separation methods are analyzed and evaluated for the separation and purification of H2 from syngas. The cryogenic process achieved high H2 purity (99.999%) with high recovery (99.999%), yet the major challenge is high energy consumption (2.53 kWh/kgFeed). The membrane process, on the other hand, consumes less energy (0.88 kWh/kgFeed) but produces H2 with low purity (98.85%) and recovery (89.91%). The economic analysis of these processes showed that the membrane process is costeffective with less TCI (34.36 m$) than the cryogenic process (38.21 m$).
A large part of 2020 and 2021 was marked by the COVID-19 pandemic. A global pandemic has caused changes in people’s behavior and has created challenges for multiple industries and numerous sectors. One of the most affected sectors is the electricity sector, which already deals with challenges caused by decarbonization and the integration of low-carbon technologies. Newly caused challenges are especially important for Distribution System Operators (DSOs) since they are responsible for the planning and operation of distribution networks and for resolving the problems caused by the change of end-users’ habits. To identify and visualize pandemic-induced changes, an integrated geographic information system (GIS)-based tool is developed and presented in this paper. After identifying errors in GIS and end-users’ consumption data and preprocessing them, pandapower and the developed harmonic calculation extension are used for the analysis of different power quality (PQ) indicators in low-voltage (LV) distribution networks. As a final step of the developed tool, the impact of COVID-19 on PQ indicators is visualized using GIS.
Global warming has slowly threatened the rapid development of mankind which makes CO2 as the main greenhouse gas utilization research has attracted more and more attention owing to its excellent energy increasing effect, especially, it provides new ideas for the development of marine heavy oil resources. The steam injection effect of offshore heavy oil reservoirs with strong edge water is restricted by problems such as short oil production time and fast edge water coning speed, CO2 assisted steam stimulation technology will effectively improve the production during steam injection in offshore heavy oil reservoirs with edge water.
The paper established a CO2 assisted cyclic steam stimulation model for offshore strong edge water heavy oil reservoir based on the rock hydrothermal reaction under CO2. Here the geochemical and fluid flow aspects are fully coupled such that the time dependent CO2 rock hydrothermal reaction is strictly preserved. Secondly, the transformation from immovable sand to mobilized sand under specific conditions is described, and the sand migration mechanism varying with time is revealed, acquired the storage mechanism and influencing factors of CO2 under steam injection. In addition, the edge water reservoir model with water rock reaction is established by CMG, which are benefited to optimizing injection production parameters of controlling water coning and increasing CO2 storage in offshore edge water heavy oil reservoir
It can analyze the edge water coning characteristics under the condition of time-varying porosity and permeability, as well as the expansion of steam chamber in the steam development process of edge water heavy oil reservoir, and the analysis of CO2 concentration distribution, to improve the utilization rate of steam energy and reduce energy consumption. Besides it provides theoretical support for the development of offshore strong edge water heavy oil reservoir and realizes the integration of carbon storage and crude oil production.