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A stochastic MPEC approach for grid tariff design with demand-side flexibility

energy systems-OPTIMIZATION MODELING SIMULATION AND ECONOMIC ASPECTS 2023年第3期14卷 707-729页

作者： Askeland, Magnus Burandt, Thorsten Gabriel, Steven A. Energy Systems SINTEF Energy Research Trondheim Norway Department of Electric Power Engineering Norwegian University of Science and Technology Trondheim Norway Workgroup for Infrastructure Policy Technical University of Berlin Berlin Germany The Energy Transportation Environment Department German Institute for Economic Research (DIW Berlin) Berlin Germany Department of Industrial Economics and Technology Management Norwegian University of Science and Technology Trondheim Norway Department of Mechanical Engineering Applied Math and Statistics Scientific Computation Program University of Maryland College Park MD USA

As the end-users increasingly can provide flexibility to the power system, it is important to consider how this flexibility can be activated as a resource for the grid. Electricity network tariffs is one option that can be used to activate this flexibility. Therefore, by designing efficient grid tariffs, it might be possible to reduce the total costs in the power system by incentivizing a change in consumption patterns. This paper provides a methodology for optimal grid tariff design under decentralized decision-making and uncertainty in demand, power prices, and renewable generation. A bilevel model is formulated to adequately describe the interaction between the end-users and a distribution system operator. In addition, a centralized decision-making model is provided for benchmarking purposes. The bilevel model is reformulated as a mixed-integer linear problem solvable by branch-and-cut techniques. Results based on both deterministic and stochastic settings are presented and discussed. The findings suggest how electricity grid tariffs should be designed to provide an efficient price signal for reducing aggregate network peaks.

关键词： Bilevel problem Grid tariffs Mathematical program with equilibrium constraints (MPEC) Uncertainty

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EXERGETIC ANALYSIS OF A SOLAR energy-BASED HYDROGEN PRODUCTION SYSTEM 23

EXERGETIC ANALYSIS OF A SOLAR ENERGY-BASED HYDROGEN PRODUCTI...

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23rd World Hydrogen energy Conference: Bridging Continents by H2, WHEC 2022

作者： Akci, Hilal Gunerhan, Huseyin Hepbasli, Arif Ege University Graduate School of Natural and Applied Science Mechanical Engineering Program Bornova Izmir35100 Turkey Ege University Faculty of Engineering Department of Mechanical Engineering Bornova Izmir35100 Turkey Yasar University Faculty of Engineering Department of Energy Systems Engineering Bornova Izmir35100 Turkey

ISBN: (纸本)9786250008430

In this study, energy, exergy and sustainability analyses are performed for a solar energy-based hydrogen production system, which is modeled with TRNSYS and engineering Equation Solver (EES) software packages. This system consists of solar photovoltaic panels (PVs), a controller, an electrolyzer, a metal hydride hydrogen tank used for hydrogen production and storage, and Proton Exchange Membrane Fuel Cell (PEMFC) for electricity storage. Dead state temperature is taken as 0 ºC. The results revealed that the PEMFC had the highest energy efficiency of 53.28%. Exergy efficiencies of the solar PV panel, the electrolyzer and the PEMFC were determined to be 9.66%, 60% and 29.39%, respectively. The exergetic sustainability index of the electrolyzer had the maximum value of 2.501. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen energy Conference: Bridging Continents by H2. All rights reserved.

关键词： Hydrogen production

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Evaluating Urban Runoff in a Catchment of Güzelyurt: A Comparative Analysis of Traditional and LID Approaches 15th

Evaluating Urban Runoff in a Catchment of Güzelyurt: A Comp...

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15th International Congress on Advances in Civil engineering, ACE 2023

作者： Baig, Mirza Mohammed Abdul Basith Akıntuğ, Bertuğ Sustainable Environment and Energy Systems Graduate Program Middle East Technical University Kalkanlı Güzelyurt99738 Turkey Civil Engineering Program Middle East Technical University Northern Cyprus Campus Kalkanlı Mersin 10 Güzelyurt99738 Turkey

ISBN: (纸本)9789819717804

Global warming and climate change have become pressing environmental challenges, primarily caused by human activities such as burning fossil fuels and deforestation. These activities release greenhouse gases into the atmosphere, disrupting the natural balance of radiation and leading to rising global temperatures. The consequences of global warming include more frequent and severe heatwaves, changes in precipitation patterns, and increased risks of urban flooding. This research focuses on sustainable stormwater management as a strategy to mitigate urban flooding and adapt to climate change. The study area is the city of Güzelyurt in Northern Cyprus, characterized by a flat topography and limited stormwater infrastructure. The existing stormwater network is insufficient and prone to failures during rainfall events. The research compares the effectiveness and efficiency of two approaches: a traditional approach that involves resizing conduits, and a sustainable approach that implements Low-Impact Development (LID) strategies. LID strategies aim to mimic natural hydrological processes and include measures such as green infrastructure, permeable pavements, rainwater harvesting systems, and vegetative swales. By implementing these strategies, stormwater runoff can be controlled, mitigating the risk of flooding, improving water quality, promoting groundwater recharge, and reducing the demand for freshwater resources. The study utilizes the Storm Water Management Model (SWMM) software to design the existing stormwater management network and simulate different scenarios. Through the evaluation of performance and analysis of results, the research results demonstrate that the implementation of LID strategies effectively doubled the existing rainfall handling capacity of the stormwater drainage system from 20 mm/h to 40 mm/h. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Deforestation

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Development and integration of an equation-solving program for engineering thermodynamics courses

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Computer Applications in engineering Education 1993年第3期1卷 265-265页

作者： Klein, S.A. Mechanical Engineering Department University of Wisconsin-Madison 53706 Dr. S. A. Klein:is a professor of Mechanical Engineering at University of Wisconsin-Madison. His engineering degrees (BS University of Illinois-Chicago MS PhD University of Wisconsin-Madison) were obtained in Chemical Engineering. Professor Klein is a member of the Solar Energy Laboratory at Wisconsin. He is the developer of the F-Chart method for sizing solar heating systems and the TRNSYS simulation program which is widely used in simulations of solar processes. Currently Professor Klein is involved in research on solar energy system performance absorption power cycles finite-time thermodynamics applications adsorption processes for air conditioning and air quality control and alternative refrigerants and systems for refrigeration and air conditioning applications. Professor Klein is also involved in the development of engineering computer tools for both instruction and research. In addition to the EES program described in this paper he is the primary author of the thermodynamics instructional program CP/Thermo and the finite element program FEHT.

Thermodynamics problems can be separated into conceptual and mathematical parts. The conceptual part consists of the problem formulation and analysis. The mathematical part seeks to obtain an answer to a problem by solving the equations identified in the analysis. The mathematical part can be complex and time-consuming and often directs the students' focus away from the concepts. An equation solving program called engineering Equation Solver (EES) was developed to reduce the time and effort required by students to solve the mathematical part of thermodynamics problems. EES differs from existing equation solving programs in that it is designed for use by students and it includes an extensive library of built-in functions for thermodynamic and transport properties of fluids. Thermodynamic and transport property data needed for solving engineering problems (eg, steam tables, refrigerant properties, psychrometric and combustion gas data) are built into the program. By eliminating table lookups and algebra, EES allows students to concentrate on engineering fundamentals, as well as to do more complex design problems.

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Particle swarm localization for mobile robots using a 2D laser sensor 8

Particle swarm localization for mobile robots using a 2D las...

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8th Brazilian Conference on Intelligent systems, BRACIS 2019

作者： Carneiro Carvalho, Joao Luiz Machado De Abreu Farias, Paulo Cesar Purcino De Souza, Edmar Egidio Furtado De Simas Filho, Eduardo Digital Systems Laboratory Electrical Engineering Program Federal University of Bahia Salvador Brazil Center for Science and Technology in Energy and Sustainability Federal University of the Recôncavo da Bahia Feira de Santana Brazil

ISBN: (纸本)9781728142531

Mobile robot localization is a complex task, specially in unstructured indoor environments, due to noise and wrong data association from sensors. The localization procedure is even harder when the vehicle has low confidence about its last pose estimate, situation that requires a Global Localization procedure. In this work, a Global Localization algorithm based on Particle Swarm Optimization (PSO) is integrated with a Pose Tracking algorithm, the Perfect Match, to obtain a robust localization technique. Results show that this approach can solve the problem of Global Localization with good performance. © 2019 IEEE.

关键词： Mobile robots

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Conceptual Design of a Robotic Vehicle Refuelling System

Conceptual Design of a Robotic Vehicle Refuelling System

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2021 International Symposium of Asian Control Association on Intelligent Robotics and Industrial Automation, IRIA 2021

作者： Acharya, Pratik Sinha, Arpita Guha, Anirban Indian Institute of Technology Bombay Centre of Excellence in Oil Gas Energy Mumbai India Indian Institute of Technology Bombay Interdisciplinary program in Systems Control Engineering Mumbai India Indian Institute of Technology Bombay Department of Mechanical Engineering Mumbai India

ISBN: (纸本)9781665433235

Robotics has been hailed as a solution for repetitive, tedious, and dangerous physical activities. One such activity which has a need for robotics is Vehicle Refuelling. Automatic Vehicle Refuelling systems have been developed by a few organisations and have also been described in patent and research literature. Most of these systems require radical changes in the design of the fuel tank of the vehicle or changes in the already existing refuelling station infrastructure. These challenges, along with technological barriers, made the adoption of such systems rare and difficult. In this paper we present two conceptual designs which do not have these limitations. Being a critical operation, we have designed for an independent safety check to preclude fuel spillage. An inbuilt option to shift to manual operation makes it an attractive candidate for implementation in existing fuel pumps. © 2021 IEEE.

关键词： Conceptual design

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Corrigendum to “Towards equitable and sustainable indoor air quality guidelines – A perspective on mandating indoor air quality for public buildings” [Indoor Environ. 2 1 (2025) 100070]

Indoor Environments

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Indoor Environments 2025年第1期2卷

作者： Ulla Haverinen-Shaughnessy Marzenna R. Dudzinska Samy Clinchard Sani Dimitroulopoulou Xiaojun Fan Piet Jacobs Henna Maula Amelia Staszowska Oluyemi Toyinbo Ju-Hyeong Park Civil Engineering Research Unit Faculty of Technology The University of Oulu Finland Indoor Air Program The Russell School of Chemical Engineering The University of Tulsa OK USA Faculty of Environmental Engineering Lublin University of Technology Poland Air Quality & Public Health Group Environmental Hazards and Emergencies Department RCCE UK Health Security Agency UK Chair of Architecture and Building Systems Institute of Technology in Architecture ETH Zurich Zurich Switzerland Department of Building & Energy Systems TNO Delft the Netherlands Built Environment Research Group Turku University of Applied Sciences Turku Finland Respiratory Health Division CDC/National Institute for Occupational Safety and Health USA

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An Investigation of Heuristic Control Strategies for Multi-Electrolyzer Wind-Hydrogen systems Considering Degradation

An Investigation of Heuristic Control Strategies for Multi-E...

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2023 IEEE Conference on Control Technology and Applications, CCTA 2023

作者： Tully, Zachary Starke, Genevieve Johnson, Kathryn King, Jennifer Colorado School of Mines Advanced Energy Systems Graduate Program GoldenCO80401 United States National Renewable Energy Laboratory GoldenCO80401 United States Colorado School of Mines Electrical Engineering Department GoldenCO80401 United States

ISBN: (纸本)9798350335446

With the growing demand for renewable-energy-powered hydrogen generation and the corresponding increase in plant capacity, individually controlling many electrolyzer stacks will be critical for increasing the plant's lifetime and efficiency. This paper introduces a rule-based controller framework targeting electrolyzer degradation to explore the opportunity space in multi-stack hydrogen plant control. A novel control-oriented degradation model is also presented in this work, which quantifies the impact of steady power input, fluctuating power input, and the number of startup/shutdown cycles on electrolyzer degradation. Using a wind power input signal, 13 controller configurations are tested on 5 MW hydrogen plants consisting of 2, 5, 10, and 25 stacks. These configurations are evaluated on their capability to mitigate electrolyzer degradation and efficiently produce hydrogen from the time-varying input power. The results show that multi-stack control for degradation can extend the plant's lifetime by more than a factor of 3 with minimal impact on instantaneous hydrogen production. © 2023 IEEE.

关键词： Controllers

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What Role Do Aggregators Play in Power System Security and Resilience?

What Role Do Aggregators Play in Power System Security and R...

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2023 Resilience Week, RWS 2023

作者： Matsuda-Dunn, Reiko Leddy, Laura Hotchkiss, Eliza Gautam, Mukesh Abdelmalak, Michael National Renewable Energy Laboratory GoldenCO80401 United States Colorado School of Mines Advanced Energy Systems PhD Program GoldenCO80401 United States University of Nevada at Reno Department of Electrical and Biomedical Engineering RenoNV89557 United States

ISBN: (纸本)9798350347470

Barriers to the participation of distributed energy resources (DERs) in wholesale electricity markets have limited the use of DERs for power system security and resilience. In September 2020, the Federal energy Regulatory Commission (FERC) approved an order to reduce these barriers. FERC Order No. 2222 enables the participation of DER aggregators in wholesale electricity markets. DERs include renewable generation and technologies that support the integration of renewable generation by increasing grid flexibility and resilience. Requiring wholesale energy markets to allow DER aggregator participation provides a path for DERs to become competitive in these markets. As the contribution from aggregated DERs continues to increase, the aggregator's role in supporting grid security and resilience will become more critical. This paper reviews work that demonstrates how DER aggregators can provide resilience support through technical capabilities, operational strategies, and secure communication architectures. Socioeconomic influences and impacts of aggregators, including implications for social resilience, are presented. In surveying the current state-of-the-art across different but interconnected topics, we illustrate how aggregators can be power system participants that enhance grid security. There is no one-size-fits-all approach to enhancing resilience in a power grid that includes a growing cohort of DER aggregators, but there are many options for aggregators to contribute to a more resilient and secure power grid. © 2023 IEEE.

关键词： Power markets

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First and second law analyses of wastewater cooled condenser for a refrigeration system

First and second law analyses of wastewater cooled condenser...

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作者： Karacayli, Ibrahim Altay, Lutfiye Hepbasli, Arif Air Conditioning and Refrigeration Technology Program Ege High Vocational School Ege University Bornova Izmir35100 Turkey Department of Mechanical Engineering Faculty of Engineering Ege University Bornova Izmir35100 Turkey Department of Energy Systems Engineering Faculty of Engineering Yaşar University Bornova Izmir35100 Turkey

In this study, a vapour compression refrigeration (VCR) system with a wastewater (WW) cooled condenser at a temperature range of 27-29°C was designed. The cooling capacity of the system using R134a as the refrigerant was 1.09 kW. The condenser consisted of a coaxial heat exchanger with a capacity of 1 kW. This paper dealt with energy and exergy analyses of the VCR system using WW, as a heat sink. Experiments were performed in order to evaluate the energetic and exergetic performances of the wastewater-cooled condenser (WWC) and the overall system. The convective heat transfer coefficient of WW and refrigerant in the condenser, overall heat transfer coefficient of the WWC, total amount of heat removed by WW, amount of cooling effect, coefficient of performance (COP), exergy destruction rate, and second law efficiencies of the WWC and VCR system were calculated under different WW temperatures and flowrates. Increasing volumetric flowrate of WW from 200 L/h to 400 L/h caused 4.4% improvement in COP, 12.0% reduction in exergy destruction, and 10.3% increase in exergy efficiency. © 2019 Inderscience Enterprises Ltd.

关键词： Exergy

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