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Impact of FACTS devices on exercising market power in deregulated electricity market

Shanmugam PRABHAKAR KARTHIKEYAN, I. JACOB RAGLEND, D. P. KOTHARI

《能源前沿(英文)》 2013年 第7卷 第4期   页码 448-455 doi: 10.1007/s11708-013-0262-x

摘要: In power system studies, congestion in transmission lines and utilization of flexible alternating current transmission system (FACTS) devices are closely associated. These devices are very important due to their role in power delivery system enhancement. It is to be noted that the generation companies can exercise their market power which depends on the line flows, line constraints, generators’ location and its share to the individual loads. This issue cannot be overlooked as it creates monopoliness which is against the deregulated market policy. The objective of this paper is to study the impact of market power when FACTS devices like thyristor controlled switching capacitor (TCSC) and thyristor controlled phase angle regulator (TCPAR) are used under steady state operation. The market power is determined using nodal must-run share (NMRS) index for the standard IEEE 14-bus system with and without the above FACTS devices and the results obtained are compared. All the above simulations are conducted in a MATLAB 7.9-R2009b environment.

关键词: flexible alternating current transmission system (FACTS)     thyristor controlled switching capacitor (TCSC)     thyristor controlled phase angle regulator (TCPAR)     market power     must-run generation (MRG)     nodal must-run share (NMRS)    

Enhancing power transfer capability through flexible AC transmission system devices: a review

Fadi M. ALBATSH,Saad MEKHILEF,Shameem AHMAD,H. MOKHLIS,M. A. HASSAN

《信息与电子工程前沿(英文)》 2015年 第16卷 第8期   页码 658-678 doi: 10.1631/FITEE.1500019

摘要: Global demand for power has significantly increased, but power generation and transmission capacities have not increased proportionally with this demand. As a result, power consumers suffer from various problems, such as voltage and frequency instability and power quality issues. To overcome these problems, the capacity for available power transfer of a transmission network should be enhanced. Researchers worldwide have addressed this issue by using flexible AC transmission system (FACTS) devices. We have conducted a comprehensive review of how FACTS controllers are used to enhance the available transfer capability (ATC) and power transfer capability (PTC) of power system networks. This review includes a discussion of the classification of different FACTS devices according to different factors. The popularity and applications of these devices are discussed together with relevant statistics. The operating principles of six major FACTS devices and their application in increasing ATC and PTC are also presented. Finally, we evaluate the performance of FACTS devices in ATC and PTC improvement with respect to different control algorithms.

关键词: FACTS devices     Available transfer capability     Power transfer capability     Artificial intelligence    

Bone metastasis of hepatocellular carcinoma: facts and hopes from clinical and translational perspectives

《医学前沿(英文)》 2022年 第16卷 第4期   页码 551-573 doi: 10.1007/s11684-022-0928-z

摘要: Patients with hepatocellular carcinoma (HCC) and bone metastasis (BM) suffer from greatly reduced life quality and a dismal prognosis. However, BM in HCC has long been overlooked possibly due to its relatively low prevalence in previous decades. To date, no consensus or guidelines have been reached or formulated for the prevention and management of HCC BM. Our narrative review manifests the increasing incidence of HCC BM to sound the alarm for additional attention. The risk factors, diagnosis, prognosis, and therapeutic approaches of HCC BM are detailed to provide a panoramic view of this disease to clinicians and specialists. We further delineate an informative cancer bone metastatic cascade based on evidence from recent studies and point out the main factors responsible for the tumor-associated disruption of bone homeostasis and the formation of skeletal cancer lesions. We also present the advances in the pathological and molecular mechanisms of HCC BM to shed light on translational opportunities. Dilemmas and challenges in the treatment and investigation of HCC BM are outlined and discussed to encourage further endeavors in the exploration of underlying pathogenic and molecular mechanisms, as well as the development of novel effective therapies for HCC patients with BM.

关键词: HCC     bone     osteotropism     clinical     basic researches     advances    

Back to the spring of Wuhan: facts and hope of COVID-19 outbreak

Guangbiao Zhou, Saijuan Chen, Zhu Chen

《医学前沿(英文)》 2020年 第14卷 第2期   页码 113-116 doi: 10.1007/s11684-020-0758-9

Interactive DE for solving combined security environmental economic dispatch considering FACTS technology

Belkacem MAHDAD, K. SRAIRI, B. TAREK

《能源前沿(英文)》 2013年 第7卷 第4期   页码 429-447 doi: 10.1007/s11708-013-0270-x

摘要: This paper presents an efficient interactive differential evolution (IDE) to solve the multi-objective security environmental/economic dispatch (SEED) problem considering multi shunt flexible AC transmission system (FACTS) devices. Two sub problems are proposed.The first one is related to the active power planning to minimize the combined total fuel cost and emissions, while the second is a reactive power planning (RPP) using multi shunt FACTS device based static VAR compensator (SVC) installed at specified buses to make fine corrections to the voltage deviation, voltage phase profiles and reactive power violation. The migration operation inspired from biogeography-based optimization (BBO) algorithm is newly introduced in the proposed approach, thereby effectively exploring and exploiting promising regions in a space search by creating dynamically new efficient partitions. This new mechanism based migration between individuals from different subsystems makes the initial partitions to react more by changing experiences. To validate the robustness of the proposed approach, the proposed algorithm is tested on the Algerian 59-bus electrical network and on a large system, 40 generating units considering valve-point loading effect. Comparison of the results with recent global optimization methods show the superiority of the proposed IDE approach and confirm its potential for solving practical optimal power flow in terms of solution quality and convergence characteristics.

关键词: optimal power flow (OPF)     economic dispatch     environment     differential evolution     migration operator     multi-objective     flexible AC transmission systems (FACTS)     static VAR compensator (SVC)    

Attuned design of demand response program and M-FACTS for relieving congestion in a restructured market

Y. HASHEMI,H. SHAYEGHI,B. HASHEMI

《能源前沿(英文)》 2015年 第9卷 第3期   页码 282-296 doi: 10.1007/s11708-015-0366-6

摘要: This paper addresses the attuned use of multi-converter flexible alternative current transmission systems (M-FACTS) devices and demand response (DR) to perform congestion management (CM) in the deregulated environment. The strong control capability of the M-FACTS offers a great potential in solving many of the problems facing electric utilities. Besides, DR is a novel procedure that can be an effective tool for reduction of congestion. A market clearing procedure is conducted based on maximizing social welfare (SW) and congestion as network constraint is paid by using concurrently the DR and M-FACTS. A multi-objective problem (MOP) based on the sum of the payments received by the generators for changing their output, the total payment received by DR participants to reduce their load and M-FACTS cost is systematized. For the solution of this problem a nonlinear time-varying evolution (NTVE) based multi-objective particle swarm optimization (MOPSO) style is formed. Fuzzy decision-making (FDM) and technique for order preference by similarity to ideal solution (TOPSIS) approaches are employed for finding the best compromise solution from the set of Pareto-solutions obtained through multi-objective particle swarm optimization-nonlinear time-varying evolution (MOPSO-NTVE). In a real power system, Azarbaijan regional power system of Iran, comparative analysis of the results obtained from the application of the DR & unified power flow controller (UPFC) and the DR & M-FACTS are presented.

关键词: multi-converter flexible alternative current transmission systems (M-FACTS)     demand response     fuzzy decision making     multi-objective particle swarm optimization-nonlinear time-varying evolution (MOPSO-NTVE)    

医疗器械与新型穿戴式医疗设备的发展战略研究

程京,邢婉丽

《中国工程科学》 2017年 第19卷 第2期   页码 68-71 doi: 10.15302/J-SSCAE-2017.02.011

摘要:

医疗器械领域涉及国计民生,发展潜力巨大,但我国医疗器械产业中低端产品较多,高端产品缺乏原创性,发展面临重重困难和挑战。作为快速增长的新兴技术领域,发展新型穿戴式医疗设备具有重要意义。为此,中国工程院启动了“我国全民健康与医药卫生事业发展战略研究”重大咨询项目,其中“医疗器械与新型穿戴式医疗设备的发展战略研究”作为八个重点课题之一,围绕医疗器械与新型穿戴式医疗设备的发展现状和战略需求,研究我国医疗器械产业与新型穿戴式医疗设备领域的现状及特点,分析我国医疗器械国产化与新型穿戴式医疗设备领域健康发展的关键问题,研究该领域的相关政策,理清我国医疗器械发展过程中的重点问题、需求、已有优势和特点,并在此基础上提出了对策建议。

关键词: 医疗器械     产业分析     可穿戴设备     发展战略    

Ultrasonic emulsification: basic characteristics, cavitation, mechanism, devices and application

《化学科学与工程前沿(英文)》 2023年 第17卷 第10期   页码 1560-1583 doi: 10.1007/s11705-022-2160-4

摘要: Emulsion systems are widely applied in agriculture, food, cosmetic, pharmaceutical and biomedical industries. Ultrasound has attracted much attention in emulsion preparation, especially for nanoemulsion, due to its advantages of being eco-friendly, cost-effective and energy-efficient. This review provides an overview for readers to the area of ultrasonic emulsification technology. It briefly introduces and summarizes knowledge of ultrasonic emulsification, including emulsion characteristics, acoustic cavitation, emulsification mechanism, ultrasonic devices and applications. The combination of microfluidics and ultrasound is highlighted with huge advantages in controlling cavitation phenomena and emulsification intensification. A novel scale of C0.6/μD0.33EV is proposed to be able to compare the energy efficiency of emulsion preparation in different devices.

关键词: nanoemulsion     ultrasound     microreactor     multiphase     energy    

Introduction to the Special Section on Biomedical Devices for Personal Health Applications

I-Ming CHEN

《机械工程前沿(英文)》 2011年 第6卷 第1期   页码 1-2 doi: 10.1007/s11465-011-0210-6

Personalized biomedical devices & systems for healthcare applications

I-Ming CHEN, Soo Jay PHEE, Zhiqiang LUO, Chee Kian LIM

《机械工程前沿(英文)》 2011年 第6卷 第1期   页码 3-12 doi: 10.1007/s11465-011-0209-z

摘要:

With the advancement in micro- and nanotechnology, electromechanical components and systems are getting smaller and smaller and gradually can be applied to the human as portable, mobile and even wearable devices. Healthcare industry have started to benefit from this technology trend by providing more and more miniature biomedical devices for personalized medical treatments in order to obtain better and more accurate outcome. This article introduces some recent development in non-intrusive and intrusive biomedical devices resulted from the advancement of niche miniature sensors and actuators, namely, wearable biomedical sensors, wearable haptic devices, and ingestible medical capsules. The development of these devices requires carful integration of knowledge and people from many different disciplines like medicine, electronics, mechanics, and design. Furthermore, designing affordable devices and systems to benefit all mankind is a great challenge ahead. The multi-disciplinary nature of the R&D effort in this area provides a new perspective for the future mechanical engineers.

关键词: personalized medical devices     wearable sensor     haptic device     ingestible medical capsule    

Clean energy technology: materials, processes and devices for electrochemical energy conversion and storage

Hong YANG, Junliang ZHANG, Baolian YI

《能源前沿(英文)》 2017年 第11卷 第3期   页码 233-235 doi: 10.1007/s11708-017-0501-7

Optimal portfolio design of energy storage devices with financial and physical right market

《能源前沿(英文)》 2022年 第16卷 第1期   页码 95-104 doi: 10.1007/s11708-021-0788-2

摘要: With the continuous development of the spot market, in the multi-stage power market environment with the day-ahead market and right market, the study associated with the portfolio of energy storage devices requires that attention should be paid to transmission congestion and power congestion. To maximize the profit of energy storage and avoid the imbalance of power supply and consumption and the risk of node price fluctuation caused by transmission congestion, this paper presents a portfolio strategy of energy storage devices with financial/physical contracts. First, the concepts of financial/physical transmission rights and financial/physical storage rights are proposed. Then, the portfolio models of financial contract and physical contract are established with the conditional value-at-risk to measure the risks. Finally, the portfolio models are verified through the test data of the Pennsylvania-New Jersey-Maryland (PJM) electric power spot market, and the comparison between the risk aversion of portfolios based on financial/physical contract with the portfolio of the market without rights. The simulation results show that the portfolio models proposed in this paper can effectively avoid the risk of market price fluctuations.

关键词: portfolio     node price fluctuation     transmission right     energy storage right     risk aversion    

Bioartificial liver devices: Perspectives on the state of the art

null

《医学前沿(英文)》 2011年 第5卷 第1期   页码 15-19 doi: 10.1007/s11684-010-0110-x

摘要:

Acute liver failure remains a significant cause of morbidity and mortality. Bioartificial liver (BAL) devices have been in development for more than 20 years. Such devices aim to temporarily take over the metabolic and excretory functions of the liver until the patients’ own liver has recovered or a donor liver becomes available for transplant. The important issues include the choice of cell materials and the design of the bioreactor. Ideal BAL cell materials should be of good viability and functionality, easy to access, and exclude immunoreactive and tumorigenic cell materials. Unfortunately, the current cells in use in BAL do not meet these requirements. One of the challenges in BAL development is the improvement of current materials; another key point concerning cell materials is the coculture of different cells. The bioreactor is an important component of BAL, because it determines the viability and function of the hepatocytes within it. From the perspective of bioengineering, a successful and clinically effective bioreactor should mimic the structure of the liver and provide an in vivo-like microenvironment for the growth of hepatocytes, thereby maintaining the cells’ viability and function to the maximum extent. One future trend in the development of the bioreactor is to improve the oxygen supply system. Another direction for future research on bioreactors is the application of biomedical materials. In conclusion, BAL is, in principle, an important therapeutic strategy for patients with acute liver failure, and may also be a bridge to liver transplantation. It requires further research and development, however, before it can enter clinical practice.

关键词: acute liver failure     bioartificial livers     hepatocyte     bioreactor    

Rational design on photoelectrodes and devices to boost photoelectrochemical performance of solar-driven

《化学科学与工程前沿(英文)》 2022年 第16卷 第6期   页码 777-798 doi: 10.1007/s11705-022-2148-0

摘要: As an eco-friendly, efficient, and low-cost technique, photoelectrochemical water splitting has attracted growing interest in the production of clean and sustainable hydrogen by the conversion of abundant solar energy. In the photoelectrochemical system, the photoelectrode plays a vital role in absorbing the energy of sunlight to trigger the water splitting process and the overall efficiency depends largely on the integration and design of photoelectrochemical devices. In recent years, the optimization of photoelectrodes and photoelectrochemical devices to achieve highly efficient hydrogen production has been extensively investigated. In this paper, a concise review of recent advances in the modification of nanostructured photoelectrodes and the design of photoelectrochemical devices is presented. Meanwhile, the general principles of structural and morphological factors in altering the photoelectrochemical performance of photoelectrodes are discussed. Furthermore, the performance indicators and first principles to describe the behaviors of charge carriers are analyzed, which will be of profound guiding significance to increasing the overall efficiency of the photoelectrochemical water splitting system. Finally, current challenges and prospects for an in-depth understanding of reaction mechanisms using advanced characterization technologies and potential strategies for developing novel photoelectrodes and advanced photoelectrochemical water splitting devices are demonstrated.

关键词: photoelectrochemical water splitting     photoelectrodes     hydrogen production     charge separation     catalytic mechanism    

Thermo-fluidic devices and materials inspired from mass and energy transport phenomena in biological

Jian XIAO , Jing LIU ,

《能源前沿(英文)》 2009年 第3卷 第1期   页码 47-59 doi: 10.1007/s11708-008-0068-4

摘要: Mass and energy transport consists of one of the most significant physiological processes in nature, which guarantees many amazing biological phenomena and activities. Borrowing such idea, many state-of-the-art thermo-fluidic devices and materials such as artificial kidneys, carrier erythrocyte, blood substitutes and so on have been successfully invented. Besides, new emerging technologies are still being developed. This paper is dedicated to presenting a relatively complete review of the typical devices and materials in clinical use inspired by biological mass and energy transport mechanisms. Particularly, these artificial thermo-fluidic devices and materials will be categorized into organ transplantation, drug delivery, nutrient transport, micro operation, and power supply. Potential approaches for innovating conventional technologies were discussed, corresponding biological phenomena and physical mechanisms were interpreted, future promising mass-and-energy-transport-based bionic devices were suggested, and prospects along this direction were pointed out. It is expected that many artificial devices based on biological mass and energy transport principle will appear to better improve various fields related to human life in the near future.

关键词: bionics     mass transport     energy transport     artificial devices and materials     biology system     nature phenomena     medical device.    

标题 作者 时间 类型 操作

Impact of FACTS devices on exercising market power in deregulated electricity market

Shanmugam PRABHAKAR KARTHIKEYAN, I. JACOB RAGLEND, D. P. KOTHARI

期刊论文

Enhancing power transfer capability through flexible AC transmission system devices: a review

Fadi M. ALBATSH,Saad MEKHILEF,Shameem AHMAD,H. MOKHLIS,M. A. HASSAN

期刊论文

Bone metastasis of hepatocellular carcinoma: facts and hopes from clinical and translational perspectives

期刊论文

Back to the spring of Wuhan: facts and hope of COVID-19 outbreak

Guangbiao Zhou, Saijuan Chen, Zhu Chen

期刊论文

Interactive DE for solving combined security environmental economic dispatch considering FACTS technology

Belkacem MAHDAD, K. SRAIRI, B. TAREK

期刊论文

Attuned design of demand response program and M-FACTS for relieving congestion in a restructured market

Y. HASHEMI,H. SHAYEGHI,B. HASHEMI

期刊论文

医疗器械与新型穿戴式医疗设备的发展战略研究

程京,邢婉丽

期刊论文

Ultrasonic emulsification: basic characteristics, cavitation, mechanism, devices and application

期刊论文

Introduction to the Special Section on Biomedical Devices for Personal Health Applications

I-Ming CHEN

期刊论文

Personalized biomedical devices & systems for healthcare applications

I-Ming CHEN, Soo Jay PHEE, Zhiqiang LUO, Chee Kian LIM

期刊论文

Clean energy technology: materials, processes and devices for electrochemical energy conversion and storage

Hong YANG, Junliang ZHANG, Baolian YI

期刊论文

Optimal portfolio design of energy storage devices with financial and physical right market

期刊论文

Bioartificial liver devices: Perspectives on the state of the art

null

期刊论文

Rational design on photoelectrodes and devices to boost photoelectrochemical performance of solar-driven

期刊论文

Thermo-fluidic devices and materials inspired from mass and energy transport phenomena in biological

Jian XIAO , Jing LIU ,

期刊论文