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capacity-mechanisms
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Application of Electricity Market Dynamics to Generation Capacity Expansion Planning in Restructured Power System
, Ph.D. Dissertation Sharif University of Technology ; Hosseini, Hamid (Supervisor)
Abstract
In this thesis, a dynamic decision model based on the system dynamics concept is proposed for the generation capacity expansion planning of restructured power systems. In the market viewpoint framework, both the market players' behaviors and the regulatory rules are considered in the model. Short-term generation dispatch and long-term generation capacity expansion are modeled based on the technical and economical relationships in the electricity market. The proposed model contains ten different modules in order to model the energy market, the regulated incentive mechanisms, profitability assessment of investors, investment decision and capacity expansion. The modules are connected using...
Dynamic assessment of capacity investment in electricity market considering complementary capacity mechanisms
, Article Energy ; Volume 36, Issue 1 , January , 2011 , Pages 277-293 ; 03605442 (ISSN) ; Hosseini, S. H ; Sharif University of Technology
2011
Abstract
This paper proposes a decentralized market-based model for long-term capacity investment decisions in a liberalized electricity market. Investment decisions are fundamentally based on total revenues gained by investors. In most electricity markets, the complementary mechanisms are designed to ensure a desired level of reliability while covering investment costs of the suppliers. In such an environment, investment decisions are highly sensitive to expectation of price signals in both of energy market and capacity mechanisms. In this work, the system dynamics concepts are used to model the structural characteristics of electricity market such as, long-term firms' behavior and relationships...
A theory for coupled lithium insertion and viscoplastic flow in amorphous anode materials for Li-ion batteries
, Article Mechanics of Materials ; Volume 152 , 2021 ; 01676636 (ISSN) ; Arghavani, J ; Naghdabadi, R ; Brassart, L ; Sharif University of Technology
Elsevier B.V
2021
Abstract
Amorphous lithium metal alloys (LixM, with M=Si, Ge, Sn, …) are attractive anode materials for lithium-ion batteries owing to their high energy-storage capacity and safety characteristics. However, repeated insertion of lithium often leads to chemo-mechanical degradation of the alloy, which can severely reduce the battery capacity and cycle life. Better understanding of the chemo-mechanical response of lithium alloys is needed to guide the design of damage-resistant anode microstructures. In this work, we propose a constitutive theory that couples large, viscoplastic deformations to the insertion and extraction of lithium in amorphous electrode materials. The theory relies on the concept of...
Relationship between failure behaviour and weld fusion zone attributes of austenitic stainless steel resistance spot welds
, Article Materials Science and Technology ; Volume 24, Issue 12 , 2008 , Pages 1506-1512 ; 02670836 (ISSN) ; Pouranvari, M ; Sanaee, M. H ; Abedi, A ; Abootalebi, H ; Goodarzi, M ; Sharif University of Technology
2008
Abstract
Resistance spot welding was used to join austenitic stainless steel sheets. Mechanical properties of the spot welds were evaluated using tensile shear test. Mechanical behaviour was described by peak load, failure energy and failure mode. The relationship between weld fusion zone attributes and failure behaviour was studied. Generally, it was observed that increasing fusion zone size is accompanied by an increase in load carrying capacity and energy absorption capability. However, when expulsion occurs, despite almost constant weld fusion zone size, energy absorption capability reduces significantly due to increase in electrode indentation depth. Considering the failure location and failure...