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Operational Reliability Modeling and Assessment of Battery Energy Storage Based on Lithium-ion Battery Lifetime Degradation

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Journal of Modern power systems and Clean Energy 2022年第6期10卷 1738-1749页

作者： Lin Cheng Yuxiang Wan Yanglin Zhou David Wenzhong Gao State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijingChina Department of Electrical and Computer Engineering University of DenverDenverUSA IEEE

Battery energy storage(BES)systems can effectively meet the diversified needs of power system dispatching and assist in renewable energy *** reliability of energy storage is essential to ensure the operational safety of the power ***,BES systems are composed of battery *** suggests that BES performance depends not only on the configuration but also on the operating state over different lifetime *** lack of safety and reliability is the main bottleneck preventing widespread applications of BES ***,a reliability assessment algorithm and a weak-link analytical method for BES systems are proposed while considering battery lifetime ***,a novel lithium-ion battery model is proposed to identify the degradation rate of solid electrolyte interphase film formation and capacity *** impacts of different operating conditions are considered in stress factor ***,a reliability assessment algorithm for a BES system is introduced based on a universal generating *** innovative weak-link analytical method based on the reliability importance index is proposed that combines the evaluation results of state-oriented and state-change-oriented indexes through an entropy weight *** model,algorithm,indexes,and the usefulness are demonstrated in case studies based on aging test data and actual bus operating *** results demonstrate the effects of the battery status and working conditions on BES ***-link analysis is also used to assist BES systems in avoiding short-board batteries to achieve long lifetimes and efficient operation.

关键词： Battery energy storage lifetime degradation operational reliability capacity plummeting weak-link analysis

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Study on static and dynamic characteristics of the electro-hydraulic proportional directional valve

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Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 2025年

作者： Yang, Meisheng Kun, Lian Shuang, Luo Jiahan, Bao Huaizhi, Zong Anhui Province Engineering Laboratory of Intelligent Demolition Equipment Anhui University of Technology Maanshan China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou China Anhui Key Laboratory of Mine Intelligent Equipment and Technology Anhui University of Science and Technology Huainan China Anhui Province Key Laboratory of Advanced Numerical Control & Servo Technology AnHui Polytechnic University Wuhu China Engineering Technology Research Center of Hydraulic Vibration Technology Anhui University of Technology Maanshan China

Electro-hydraulic proportional directional valves are widely used in precision engineering fields, where their operational stability and reliability are critical to the performance of hydraulic systems. However, high pressure and high-frequency responses significantly affect the hydraulic forces acting on the spool, while deformations caused by pressure and thermal loads may further compromise its performance. Therefore, analyzing and compensating for hydraulic forces, as well as investigating the deformation behavior of the spool under pressure and thermal loads, are essential for enhancing its stability and reliability. Based on CFD numerical calculation methods and fluid-thermal-solid multi-physics coupling technology, the study systematically investigates the characteristics of hydraulic forces and the deformation behavior of the spool. First, Fluent was used to simulate the fluid domain under steady-state and transient conditions, obtaining pressure and velocity contour maps, flow rate curves, and the hydraulic forces acting on the spool in different structural cavities formed by the valve sleeve and spool at different valve opening degrees. The analysis identified the best cavity configuration for compensating hydraulic forces between the valve sleeve and spool. Secondly, orthogonal experimental design and numerical simulation were conducted for the arc-shaped transition cavity, followed by multi-objective optimization using a genetic algorithm. The optimized structure reduced the steady-state hydraulic force to varying extents, with a maximum reduction of 23%. Finally, the fluid-thermal-solid multi-physics coupling technology was employed, selecting the optimal structure with the best hydraulic force compensation effect for analysis. The results show that the deformation of the spool in both radial directions increase as the valve opening increases. At a valve opening of 1 mm, the maximum radial deformation in the Z direction is 7.0471 μm. Additionally, with

关键词： Precision engineering

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Synergistic utilization of coal and other energy- key to low carbon economy

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能源前沿 2011年第1期5卷 1-19页

作者： Weidou NI Zhen CHEN State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Thermal EngineeringTsinghua UniversityBeijing 100084China

In China, coal is a dominant component of energy mix, and it is expected to remain as such over the next 30 to 40 years. Coal is expected to be used even more in power generation. The direct combustion of coal already has been causing severe pollution and ecological degradation, and it is quite difficult to address the need to reduce greenhouse gas (GHG) given the direct combustion of coal. Therefore, the polygeneration system based on coal gasification, which is one of the major examples of synergistic utilization of coal, is proposed. It is a comprehensive solution to meet the energy challenges China is facing. Furthermore, the synergy of fossil fuels (especially coal) with renewable energy, the synergy of different kinds of energy for energy storage, the synergy of centralized and distributed supply of different kinds of energy, and the synergy of different kinds of energy in smart energy grid (power, gas, heat, and water) are the keys to making China a low-carbon economy. Carbon dioxide (CO2) mitigation in China should begin from the coalchemical industry given their accumulated relevant experiences. The mitigation process should gradually be transformed into the 'IGCC + polygeneration + CCUS'.The objectives of this paper are to describe the synergistic utilization of coal, and to analyze the synergy of coal with other energy resources, and to propose the scientific and technological problems to achieve these synergies.

关键词： synergy clean and efficient utilization of coal coal-based polygenration CO2 mitigation energy storage

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Effect of Multiple Models of Closed-loop Transfer Functions on Inter-harmonic Oscillation Characteristics of Grid-connected PMSG

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CSEE Journal of power and Energy systems 2024年第5期10卷 1955-1964页

作者： Jingyi Li Jianjun Yang Xiaorong Xie Haozhi Li Ke Wang Zhaohui Shi Key Laboratory of Far-shore Wind Power Technology of Zhejiang Province Huadong Engineering Corporation LimitedPower ChinaHangzhou 310014China. State Key Lab of Control and Simulation of Power Systems and Generation Equipment(Dept.of Electrical Engineering Tsinghua University)Beijing 100084China.

Establishing a suitable closed-loop transfer function model for the grid-connected PMSG system is the key basis in performing inter-harmonic characteristics *** closed-loop transfer functions can be constructed when different components of the converter controller are taken into ***,the effect of different components of the converter controller on inter-harmonic stability analysis is not *** this paper,the complete transfer function,considering different loops,is first *** on the complete closed-loop transfer function,the DC-link,PLL and voltage forward-feed are removed step by step to derive different closed-loop transfer *** inter-harmonic related poles of different closed-loop transfer functions are further calculated to analyze the effect of closedloop transfer functions on inter-harmonic characteristics ***,by performing time domain simulation,the correctness of the theoretical analysis results is *** results show that under the conditions of a weak AC system,each loop of the converter control system will reduce the stability of the interharmonic in the sub-synchronous frequency range and influence the inter-harmonic oscillation *** transfer function needs to consider the influence of each loop to accurately calculate the inter-harmonic stability of the system.

关键词： Closed-loop transfer function converter controller inter-harmonic characteristics PMSG

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A Novel Modeling Method for power Flow Calculation of Integrated Enegy Network 13

A Novel Modeling Method for Power Flow Calculation of Integr...

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2022 IEEE International Conference on power systems Technology, powerCON 2022

作者： Tian, Liting Zhou, Xuyan Lin, Cheng Yin, Zheng Lin, Ende Equipment Tsinghua University State Key Laboratory of Control and Simulation of Power Systems and Generation Beijing China Institute of Science and Technology China Three Gorges Corporation State Key Laboratory of Control and Simulation of Power Systems Beijing China

ISBN: (数字)9781665417754

ISBN: (纸本)9781665417754

Multi-energy systems may contain integrated energy networks such as electrical, gas and heating networks. The differences in the physical characteristics of each energy network make it difficult to solve power flows of the integrated energy networks. Based on the concept of energy flow, this paper realizes the unified modeling of electrical, gas and heating network to describe the stable equilibrium relationship. The basic equations for energy flow calculation contains Kirchhoff's Current Law equations, Kirchhoff's Voltage Law equations, and energy flow efficiency equations. A weighted directed graph is used to model the total system with networks and energy hubs. The proposed model is used for the joint power flow solution of the multi-energy system with Newton-Raphson algorithm. Finally, the validity and accuracy of the model are verified in a test system. © 2022 IEEE.

关键词： Newton-Raphson method

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Commutation Failure Mitigation Method Based on Improved Commutation Area in HVDC system 8

Commutation Failure Mitigation Method Based on Improved Comm...

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8th IEEE International Conference on Advanced power System Automation and Protection, APAP 2019

作者： Wang, Haozong Dong, Xinzhou Tsinghua University State Key Lab of Control and Simulation of Power Systems and Generation Equipment Beijing China

ISBN: (纸本)9781728117225

Commutation failure (CF) is one of the major concerns in high-voltage direct current (HVDC) transmission system. Of many methods to mitigate CF, advancing firing angle is preferred one since it can be easily implemented in current HVDC controllers without extra hardware modification. However, methods in previous works either lack for quantitative analysis or based on much strong hypothesis. In this paper, we propose a novel CF mitigation method based on improved commutation area. The salient feature of proposed strategy is that DC current is not considered as a constant under fault conditions. simulations on PSCAD/EMTDC software demonstrate the good performance of proposed method. © 2019 IEEE.

关键词： Electric commutation

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A bi-level trading model for an active distribution company considering demand response exchange

A bi-level trading model for an active distribution company ...

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2016 IEEE PES Asia Pacific power and Energy Engineering Conference, APPEEC 2016

作者： Cai, Yu Lin, Jin Wan, Can Song, Yonghua Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China

ISBN: (纸本)9781509054183

With widely utilization of distributed generations (DGs) and demand response (DR), the active distribution network (ADN) becomes a more proactive and strategic consumer in electricity markets to procure its energy needs at the minimum cost. Under this background, this paper proposes a bi-level trading model for a strategic ADN to minimize its operation cost in the day-ahead market. The upper level model represents the cost minimization of the ADN energy acquisition with consideration of DR, and the lower level model includes the day-ahead market clearing. Based on the complementarity theory and linearization techniques, the proposed bi-level model can be transformed into a mixed integer linear programming (MILP) problem. Comprehensive case studies demonstrate the efficiency and effectiveness of the proposed strategic trading model for an ADisCo with DGs and DR with respect to nonstrategic bidding approaches. © 2016 IEEE.

关键词： Distributed power generation

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Distributionally Robust Renewable-Transmission-Storage Planning Considering Carbon Taxes 22

Distributionally Robust Renewable-Transmission-Storage Plann...

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2022 Asia Conference on Electrical, power and Computer Engineering, EPCE 2022

作者： Xie, Rui Wei, Wei Mei, Shengwei State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

ISBN: (纸本)9781450396127

To protect the environment and lower carbon dioxide emissions, conventional fossil-fuel generators tend to be replaced by renewable generation. The volatile and uncertain renewable generation, as well as the reduced proportion of conventional fossil-fuel generators, causes challenges for power systems in terms of peak shaving. The equipment of energy storage is an important solution for the challenges. This paper proposes a distributionally robust method that coordinatedly plans renewable generation, transmission, and energy storage, minimizing the sum of investment and operation costs including carbon taxes. The operation cost is the optimal value of an operation optimization problem. Wasserstein-metric-based ambiguity set is established to deal with the possible inexactness of the empirical distribution of renewable generation and load uncertainties, based on which the worst-case expectation of operation cost is formulated. By calculating the Lipschitz constant of the operation cost function, the planning model comes down to mixed-integer linear programming. The case study in the IEEE 30-bus system demonstrates the effectiveness of the proposed method. © 2022 Owner/Author.

关键词： Carbon dioxide

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Research on Equivalent Circuit and power Transmission Characteristic of Multi-winding Transformer 16th

Research on Equivalent Circuit and Power Transmission Charac...

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16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： Zhang, Yun Zheng, Zedong Li, Chi State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

ISBN: (纸本)9789811915314

By replacing multiple two-winding transformers with a multi-winding transformer (MWT) in the isolated DC-DC converter, it can reduce the volume and increase the power density. Due to magnetic coupling in MWT, power will flow between any two windings. The relationship between the leakage inductance of multi-winding, inductance of external inductors and transmission power is studied. The power balance condition about leakage inductance and external inductance is analyzed based on different cascaded DC-DC series-parallel conversion system. The leakage inductance characteristic with different winding arrangement of MWT is analyzed. By choosing and designing appropriate winding arrangement, it can increase the power density and achieve power balancing. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： DC-DC converters

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Nanosecond Repetitively Pulsed Dielectric Barrier Discharge in Air at Atmospheric Pressure

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Plasma Science and Technology 2011年第5期13卷 591-595页

作者：邵涛章程牛铮于洋严萍周远翔 Institute of Electrical Engineering Chinese Academy of Sciences Key Laboratory of Power Electronics and Electric Drive Chinese Academy of Sciences State Key Laboratory of Control and Simulation of Power Systems and Generating Equipment Electrical Engineering DepartmentTsinghua University

Dielectric barrier discharge （DBD） between two cylindrical glass containers with salt water generated by a nanosecond repetitively pulsed power generator is reported. The electrical parameters, luminous images and spectrum diagnosis are presented. It is shown that the DBD possesses a large discharge current and an intense optical emission from the nitrogen second positive system below 400 nm. The gas temperature remains very close to room temperature regardless of pulse polarity. Luminous photographs with a short exposure time down to 2 ns indicate that no filament is observed and the discharge is homogeneous.

关键词： dielectric barrier discharge nanosecond pulse homogeneous discharge atmospheric pressure air emission spectrum

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