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Artykuły w czasopismach na temat "Power system stability"

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M.Sai Sesha, M. Sai Sesha, Madhusudanarao r. Madhusudanarao.r i V. S. N. Narasimharaju V.S.N.Narasimharaju. "Stability Improvement of Power System by Simultaneous Ac–Dc Power Transmission". Indian Journal of Applied Research 3, nr 5 (1.10.2011): 280–84. http://dx.doi.org/10.15373/2249555x/may2013/84.

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Richards, M. J. "Power system stability". Power Engineering Journal 5, nr 3 (1991): 103. http://dx.doi.org/10.1049/pe:19910024.

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Concordia, Charles. "Power System Stability". IEEE Power Engineering Review PER-5, nr 11 (listopad 1985): 8–10. http://dx.doi.org/10.1109/mper.1985.5528337.

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Basler, Michael J., i Richard C. Schaefer. "Understanding Power-System Stability". IEEE Transactions on Industry Applications 44, nr 2 (2008): 463–74. http://dx.doi.org/10.1109/tia.2008.916726.

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Hansen, D., P. Dalpiaz i S. D. Duggins. "Monitoring power system stability". IEEE Computer Applications in Power 2, nr 2 (kwiecień 1989): 14–18. http://dx.doi.org/10.1109/67.24935.

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Shirvani, Mojtaba, Ahmad Memaripour, Meysam Eghtedari i Hasan Fayazi. "Small signal stability analysis of power system following different outages". International Journal of Academic Research 6, nr 2 (30.03.2014): 268–72. http://dx.doi.org/10.7813/2075-4124.2014/6-2/a.38.

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Dr.B., Gopinath, Kalyanasundaram M., Pradeepa M. i Karthika V. "Locating Hybrid Power Flow Controller in a 30-Bus System Using Chaotic Evolutionary Algorithm to Improve Power System Stability". Bonfring International Journal of Software Engineering and Soft Computing 8, nr 1 (30.03.2018): 12–16. http://dx.doi.org/10.9756/bijsesc.8382.

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Mehar, Pramod Kumar, i Mrs Madhu Upadhyay. "Power System Stability Study on Multi Machine Systems having DFIG Based Wind Generation System". SMART MOVES JOURNAL IJOSCIENCE 6, nr 3 (10.03.2020): 27–30. http://dx.doi.org/10.24113/ijoscience.v6i3.279.

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Power system stability is related to principles of rotational motion and the swing equation governing the electromechanical dynamic behavior. In the special case of two finite machines the equal area criterion of stability can be used to calculate the critical clearing angle on the power system, it is necessary to maintain synchronism, otherwise a standard of service to the consumers will not be achieved. With the increasing penetration of doubly fed induction generators (DFIGs), the impact of the DFIG on transient stability attracts great attention. Transient stability is largely dominated by generator types in the power system, and the dynamic characteristics of DFIG wind turbines are different from that of the synchronous generators in the conventional power plants. The analysis of the transient stability on DFIG integrated power systems has become a very important issue. This paper is a review of three types of stability condition. The first type of stability, steady state stability explains the maximum steady state power and the power angle diagram. There are several methods to improve system stability in which some methods are explained.
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Mynuddin, Mohammed. "Stability Study of Power System". International Journal of Energy and Power Engineering 4, nr 2 (2015): 43. http://dx.doi.org/10.11648/j.ijepe.20150402.15.

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Yifan Tang i Longya Xu. "Slip power recovery system stability". IEEE Industry Applications Magazine 1, nr 3 (1995): 14–20. http://dx.doi.org/10.1109/2943.384661.

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Rozprawy doktorskie na temat "Power system stability"

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Singh, Gurinder Pal. "Power system stability". Thesis, Singh, Gurinder Pal (2018) Power system stability. Honours thesis, Murdoch University, 2018. https://researchrepository.murdoch.edu.au/id/eprint/44793/.

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In order to understand the stability it is essential to become familiar with the basic operations of a power system. There are three main components of a power system i.e. generation, transmission and distribution. Electrical power is generated mostly from synchronous machines. The primary sources of energy (fossil, hydraulic) are converted into mechanical energy through prime movers. Mechanical energy is used by synchronous generators to produce electrical power and most of the electric power systems are three phase AC systems operating at constant voltage. Three phase equipment is also used by generation and transmission facilities along with industrial residential and commercial loads that are equally distributed among all the phases to form a three‐phase balanced system [1]. A power system entirely relies upon its voltage, frequency and rotor angle stability. The main causes behind the instabilities, analysis techniques and methods used to improve the overall system stability will be discussed in this report. This report will explore the main aspects of power system instabilities by reviewing existing literature, analysing through simulation and finally correcting the grid instability with regard to voltage, frequency, and rotor angle. A small nine bus transmission network using Power Factory to analyse and match the theoretical factors that determine the reliability and operation as mentioned in current literature. The Power Factory provides numerous inbuilt global models of Automatic voltage regulator (Avr), Governor and Turbine (Gov), and power system stabilizer (PSS) etc. to reduce the complexity and avoid building the differential functions from scratch. The system will be analysed under four random avr and gov models by introducing a three‐phase fault at one of the transmission lines. The response of one of the generator will be examined on the basis of its variables like rotor angle, speed, output powers, terminal and excitation voltages. The ideal combination of avr and gov will be used to carry out PV and QV curve analysis to find the weakest bus in the system. Lastly, the performance of that bus will be analysed by varying the load and reactive power compensation. Stability of the system will be enhanced by using various Avr, Gov models through testing pre‐existing parameters.
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Mensah, Kwaku Sarpong. "Improving Stability of Ghana's Power System Using Power System Stabiliser(PSS)". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12884.

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Stability of a power system is vital for its reliable operation and maintaining system stability has been a big challenge for engineers over the years. One way of improving system stability is the use of power system stabiliser (PSS). Its main function is to add damping to the generator rotor oscillation by modulating the generator excitation so as to develop a component of electrical torque in phase with the rotor speed deviation. In Ghana, two power stations have their generators equipped with PSS but none of the PSS are activated. The main objective of this study is to assess how the stability of the power system of Ghana can be improved by activating the power system stabilizers (PSS) on the excitation system of some of the generating units. To effectively perform the study the following questions had to be answered.To what extent will the activation of the PSS on some generating units affect the overall system dynamic performance?Where in the power system should the PSS be activated?To what extend can the PSS reduces system oscillation? What improvement can be made to the power system to optimise the performance of the PSS?Data of Ghana and the interconnected systems were first collected, reviewed and all the systems were modelled using PSSE program. Steady state stability studies were then performed to identify the inadequacy in the system during steady state operations. Five base cases including peak and average load condition with and without contingency were used for this study. Dynamic stability studies were also carried out by selecting appropriate dynamic models for generators, exciters and governors that best fit the dynamic behaviour of the generating units in the PSSE program. Appropriate PSS models were selected for units equipped with PSS based on manufacturers’ recommendation. Series of dynamic simulations were carried out to identify the best location and parameter settings for the PSS. Small signal stability studies were also carried out to complement the results obtained from the transient studies using NEVA. There was however a defect in the NEVA program and full results could not be obtained.In conclusion, Ghana’s system is likely to experience voltage collapse during a transmission outage on some critical lines at peak period unless some loads are shed. This risk can be reduced by improving the power factor to 0.95 using more reactive power compensating devices (capacitor bank) at the local substation. Transient stability results also show that the best location for the PSS to effectively damped oscillation is Akosombo GS. Inter-area oscillations of 0.5Hz between Ghana and Ivory Coast systems, local-area oscillation of 0.8Hz between the Akosombo units and Aboadze units in Ghana, were effectively damped within 7sec with PSS at Akosombo GS. It is highly recommended that PSS at Akosombo generation station be activated since their application has a positive impact on the dynamic performance of Ghana’s system. Steady state stability be improved by correcting the power factor at the local stations and line relay settings reviewed to accommodate the present operating condition. It is also recommended that the PSS be coordinated effectively with the protection and control devices for optimal performanc
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Qi, Li. "AC system stability analysis and assessment for Shipboard Power Systems". Texas A&M University, 2004. http://hdl.handle.net/1969.1/3128.

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The electric power systems in U.S. Navy ships supply energy to sophisticated systems for weapons, communications, navigation and operation. The reliability and survivability of a Shipboard Power System (SPS) are critical to the mission of a Navy ship, especially under battle conditions. When a weapon hits the ship in the event of battle, it can cause severe damage to the electrical systems on the ship. Researchers in the Power System Automation Laboratory (PSAL) at Texas A&M University have developed methods for performing reconfiguration of SPS before or after a weapon hit to reduce the damage to SPS. Reconfiguration operations change the topology of an SPS. When a system is stressed, these topology changes and induced dynamics of equipment due to reconfiguration might cause voltage instability, such as progressive voltage decreases or voltage oscillations. SPS stability thus should be assessed to ensure the stable operation of a system during reconfiguration. In this dissertation, time frames of SPS dynamics are presented. Stability problems during SPS reconfiguration are classified as long-term stability problems. Since angle stability is strongly maintained in SPS, voltage stability is studied in this dissertation for SPS stability during reconfiguration. A test SPS computer model, whose simulation results were used for stability studies, is presented in this dissertation. The model used a new generalized methodology for modeling and simulating ungrounded stiffly grounded power systems. This dissertation presents two new indices, a static voltage stability index (SVSILji) and a dynamic voltage stability index (DVSI), for assessing the voltage stability in static and dynamic analysis. SVSILji assesses system stability by all lines in SPS. DVSI detects local bifurcations in SPS. SVSILji was found to be a better index in comparison with some indices in the literature for a study on a two-bus power system. Also, results of DVSI were similar to the results of conventional bifurcation analysis software when applied to a small power system. Using SVSILji and DVSI on the test SPS computer model, three of four factors affection voltage stability during SPS reconfiguration were verified. During reconfiguration, SVSILji and DVSI are used together to assess SPS stability.
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Gnanam, Gnanaprabhu. "Optimal power flow including voltage stability". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq25844.pdf.

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Adu, James Amankwah <1990&gt. "Participation of wind power plants in power system stability". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10109/1/PhD_Thesis_Final.pdf.

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The integration of large amounts of wind power in power systems coupled with the increasing replacement of large conventional synchronous generators by wind power plants (WPPs) presents a considerable impact on power system stability. This is partly because most WPPs, particularly variable speed wind turbine (VSWT) types, are connected to the network via power converters which decouples their output power from the grid frequency, and this results in considerable loss of system inertia. Also, VSWTs are in general operated at the maximum power point tracking, which makes them unable to increase their output power beyond the maximum power level for long-term frequency support. For this reason, it is important to develop control techniques that enable WPPs to participate in power system stability improvement. In literature, several studies have been reported on the frequency control provision of a wind turbines (WT), mainly classified into two categories: inertial response (IR) and primary frequency response (PFR). This work investigates the IR and PFR capabilities of VSWTs; the control schemes are presented in detail and the required energy buffers also discussed. For the IR, the electrostatic energy stored in the dc-link capacitors and the kinetic energy reserve of the WT rotors are utilised. The PFR service is guaranteed by a deloading scheme that reserves a portion of the maximum available power of the WT. Also, the possibility of providing both IR and PFR using external energy storage systems, in this work supercapacitors and battery energy storage system, has been considered. For each support scheme analysed, this work provides a comprehensive survey. This dissertation further proposes two coordinated control strategies that exploits the full potential of VSWTs to participate in power system frequency response enhancement and small-signal stability support. All the control schemes are developed and simulation studies performed on DIgSILENT PowerFactory simulation environment.
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Matos, Bruna Krasota. "Finite-time stability of switched systems with application to power system stability problems". reponame:Repositório Institucional da UFPR, 2015. http://hdl.handle.net/1884/45688.

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Supervisor : Prof. Dr. Roman Kuiava
Dissertação (mestrado) - Universidade Federal do Paraná, Setor de Tecnologia, Programa de Pós-Graduação em Engenharia Elétrica. Defesa: Curitiba, 30/08/2016
Inclui referências : f. 79-82
Área de concentração
Resumo: O conceito de estabilidade a tempo finito (ETF) foi criado em 1950. Sistemas dinâmicos cujas trajetórias convergem para o estado de equilíbrio em um tempo finito fazem parte desse conceito. Sistemas chaveados lineares não homogêneos também estõ sendo considerados. Esses sistemas são oriundos de muitas aplicações de controle e para casos aonde sistemas físicos não são descritos por processos unicamente contínuos ou unicamente discretos. Essa dissertação esta concentrada no problema de estabilidade a tempo finito de uma classe de sistemas chaveados lineares não homogêneos contínuos no tempo sob um sinal de chaveamento dependente do tempo seguindo um tempo de permanência T. Uma vez que a estabilidade a tempo finito é garantida, um dos principais resultados dessa dissertação garante que qualquer trajetória do sistema que comece em uma região 1 do espaço de estados, permanecera dentro de 2 _ 1 ao longo de um intervalo de tempo finito, e para qualquer sequencia de chaveamento com tempo de estabelecimento ¯ T _ T. As condições de estabilidade a tempo finito obtidas na forma de inequações matriciais bilineares (BMIs), podem ser transformadas em inequações matriciais lineares (LMIs) por uma sequência de passos que incluem o cálculo dos conjuntos 1 e 2 por meio de um conhecimento prévio dos limites de operação do sistema. Dois exemplos ilustrativos do estudo de estabilidade em sistemas de potência são utilizados para apresentar a validade dos resultados. Palavras-chave: estabilidade a tempo finito, sistemas chaveados não autônomos, inequações matriciais lineares
Abstract: The finite-time stability (FTS) concept was created in the 1950. Dynamical systems whose trajectories converge to an equilibrium state in finite time are involved in this concept. Switched non-homogeneous linear systems are being considered. These systems can result from many control applications and for cases where physical systems are not described by simply continuous or simply discrete processes. This dissertation is concerned with the finite-time stability problem of a class of linear continuous-time non-homogeneous switched systems under a time-dependent switching signal constrained by a dwell-time T. Once the finite-time stability is guaranteed, one of the main results of the dissertation guarantees that any system trajectory starting in a subset 1 of the state-space will remain in 2 _ 1 over a finite time interval, and, for any switching sequence with a dwell-time ¯ T _ T. The finite-time stability conditions which provided in the form of bilinear matrix inequalities (BMIs), can be transformed to linear matrix inequalities (LMIs) by means of a step-by-step procedure that includes the computation of the sets 1 and 2 by the knowledge of the system's operating range. Two illustrative examples in power system stability study are used to show the validity of the results. Keywords: finite-time stability, Non-autonomous switched systems, Linear matrix inequalities
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Anderson, Sharon Lee. "Reduced order power system models for transient stability studies". Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09052009-040743/.

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Dai, F. "Load modelling for power system stability studies". Thesis, University of Manchester, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.578290.

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Brook, D. P. "Power system stability using coordinated controller settings". Thesis, University of Bath, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419343.

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Hiskens, Ian A. "Energy functions, transient stability and voltage behaviour /". Online version, 1990. http://bibpurl.oclc.org/web/30417.

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Książki na temat "Power system stability"

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Power system stability. New York: IEEE Press, 1995.

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Rácz, László. Power system stability. Amsterdam: Elsevier, 1988.

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Zhu, Yue. Power System Loads and Power System Stability. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37786-1.

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Taylor, Carson W. Power system voltage stability. New York: McGraw-Hill, 1994.

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A, Fouad A., i Institute of Electrical and Electronics Engineers., red. Power system control and stability. Piscataway, N.J: IEEE Press, 1994.

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Anderson, P. M. Power system control and stability. Wyd. 2. Piscataway, N.J: IEEE Press, 2003.

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L, Grigsby Leonard, red. Power system stability and control. Boca Raton: Taylor & Francis, 2007.

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Anderson, Paul M. Power system control and stability. Piscataway, NJ: IEEE Press, 1994.

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Janusz, Bialek, i Bumby J. R, red. Power system dynamics and stability. Chichester: John Wiley, 1997.

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Kundur, P. Power system stability and control. New York: McGraw-Hill, 1994.

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Części książek na temat "Power system stability"

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Shertukde, Hemchra Madhusudan. "Power System Stability". W Power Systems Analysis Illustrated with MATLAB® and ETAP®, 199–220. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, 2018.: CRC Press, 2019. http://dx.doi.org/10.1201/9780429436925-12.

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Arrillaga, J., i N. R. Watson. "System Stability". W Computer Modelling of Electrical Power Systems, 229–96. West Sussex, England: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118878286.ch7.

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Zhu, Yue. "Power System Stability Indices". W Power System Loads and Power System Stability, 49–73. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37786-1_3.

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Salam, Md Abdus. "Power System Stability Analysis". W Fundamentals of Electrical Power Systems Analysis, 411–60. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3212-2_9.

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Vournas, Costas. "Power System Voltage Stability". W Encyclopedia of Systems and Control, 1085–90. London: Springer London, 2015. http://dx.doi.org/10.1007/978-1-4471-5058-9_263.

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Vournas, Costas. "Power System Voltage Stability". W Encyclopedia of Systems and Control, 1–7. London: Springer London, 2014. http://dx.doi.org/10.1007/978-1-4471-5102-9_263-1.

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Vournas, Costas. "Power System Voltage Stability". W Encyclopedia of Systems and Control, 1–6. London: Springer London, 2020. http://dx.doi.org/10.1007/978-1-4471-5102-9_263-2.

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Vournas, Costas. "Power System Voltage Stability". W Encyclopedia of Systems and Control, 1756–61. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-44184-5_263.

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JU, Ping. "Stochastic Stability of Power System". W Power Systems, 73–89. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1816-0_4.

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Zhu, Yue. "Probabilistic Assessment and Sensitivity Analysis in Stability Studies". W Power System Loads and Power System Stability, 75–90. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37786-1_4.

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Streszczenia konferencji na temat "Power system stability"

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Basler, Michael J., i Richard C. Schaefer. "Understanding Power System Stability". W Conference Record of 2007 Annual Pulp and Paper Industry Technical Conference. IEEE, 2007. http://dx.doi.org/10.1109/papcon.2007.4286282.

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Basler, M. J., i R. C. Schaefer. "Understanding power system stability". W 2005 58th Annual Conference for Protective Relay Engineers. IEEE, 2005. http://dx.doi.org/10.1109/cpre.2005.1430421.

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Hodge, C. G., J. O. Flower i A. Macalindin. "DC power system stability". W 2009 IEEE Electric Ship Technologies Symposium (ESTS 2009). IEEE, 2009. http://dx.doi.org/10.1109/ests.2009.4906548.

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Lynch, C. A. "An add-on power system stabiliser". W IEE Colloquium on Generator Excitation Systems and Stability. IEE, 1996. http://dx.doi.org/10.1049/ic:19960114.

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Altin, Necmi. "Energy storage systems and power system stability". W 2016 International Smart Grid Workshop and Certificate Program (ISGWCP). IEEE, 2016. http://dx.doi.org/10.1109/isgwcp.2016.7548268.

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"FA 2 - power system stability". W 2004 Large Engineering Systems Conference on Power Engineering. IEEE, 2004. http://dx.doi.org/10.1109/lescpe.2004.1356270.

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Zhang, Peihang, i Ping Chen. "Investigation Concerning Power System Stability". W 2020 IEEE International Conference on Advances in Electrical Engineering and Computer Applications (AEECA). IEEE, 2020. http://dx.doi.org/10.1109/aeeca49918.2020.9213522.

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Su, Y. C., S. J. Cheng, J. Y. Wen i J. Zhang. "Power System Dynamic Stability Analysis and Stability Type Discrimination". W 41st International Universities Power Engineering Conferenc. IEEE, 2006. http://dx.doi.org/10.1109/upec.2006.367531.

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Su, Y., S. Cheng i J. Wen. "Power System Dynamic Stability Analysis and Stability Type Discrimination". W 2006 International Conference on Power System Technology. IEEE, 2006. http://dx.doi.org/10.1109/icpst.2006.321774.

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Arora, Ritika, i Surender Dahiya. "Dynamic stability enhancement of power system using PSO optimized fuzzy power system stabilizer". W 2014 6th IEEE Power India International Conference (PIICON). IEEE, 2014. http://dx.doi.org/10.1109/poweri.2014.7117618.

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Raporty organizacyjne na temat "Power system stability"

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Dagle, J. E., D. W. Winiarski i M. K. Donnelly. End-use load control for power system dynamic stability enhancement. Office of Scientific and Technical Information (OSTI), luty 1997. http://dx.doi.org/10.2172/484515.

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Myers, Tanya L., Christopher A. Bonebrake, Bret D. Cannon, Reynold Suarez, Timothy L. Stewart i Brian K. Hatchell. Report on the Power and Detector Stability Measurements for the QC Laser Alignment System. Office of Scientific and Technical Information (OSTI), grudzień 2003. http://dx.doi.org/10.2172/15010548.

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Elwood, D. M. Stability analysis of large electric power systems. Office of Scientific and Technical Information (OSTI), styczeń 1993. http://dx.doi.org/10.2172/6853993.

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Elwood, D. M. Stability analysis of large electric power systems. Office of Scientific and Technical Information (OSTI), styczeń 1993. http://dx.doi.org/10.2172/10127614.

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Enlow, Holly, Nathaniel Wetzel, David Biedenharn, Christopher Haring, J. Lamport, Kyle Raburn i Sarah Girdner. Geomorphic assessment of the St. Francis River : between Wappapello Lake and Lake City. Engineer Research and Development Center (U.S.), lipiec 2023. http://dx.doi.org/10.21079/11681/47280.

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The St. Francis River is a complex system that lies in the historic floodplain of the Mississippi and Ohio Rivers. The basin has undergone extensive anthropogenic modifications, including reservoir construction, large-scale channelization, and construction of leveed floodways. Several analyses of available gage data, lidar data, and historical research have provided a picture of geomorphic trends and an overall understanding of the river’s stability. The types of analysis used to determine trends included yearly low stage plots, stage-duration curves, specific gage analysis, water surface slopes, and stream power changes. The results from these analyses were synthesized to develop an overall assessment of the reach. Channel cutoffs resulted in a significant decrease in channel length and sinuosity and triggered geomorphic change throughout the river. Immediately following channelization, dramatic decreasing trends in stage were observed for Fisk and Dekyn’s Store, while St. Francis and Holly Island began to aggrade. Slopes and stream power were significantly increased for the upper portion of the study area and showed a decreasing trend for the lower reach.
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Callaghan, Caitlin, Danielle Peterson, Timothy Cooke, Brandon Booker i Kathryn Trubac. Installation resilience in cold regions using energy storage systems. Engineer Research and Development Center (U.S.), październik 2021. http://dx.doi.org/10.21079/11681/42200.

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Electrical energy storage (EES) has emerged as a key enabler for access to electricity in remote environments and in those environments where other external factors challenge access to reliable electricity. In cold climates, energy storage technologies face challenging conditions that can inhibit their performance and utility to provide electricity. Use of available energy storage technologies has the potential to improve Army installation resilience by providing more consistent and reliable power to critical infrastructure and, potentially, to broader infrastructure and operations. Sustainable power, whether for long durations under normal operating conditions or for enhancing operational resilience, improves an installation’s ability to maintain continuity of operations for both on- and off-installation missions. Therefore, this work assesses the maturity of energy storage technologies to provide energy stability for Army installations in cold regions, especially to meet critical power demands. The information summarized in this technical report provides a reference for considering various energy storage technologies to support specific applications at Army installations, especially those installations in cold regions.
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Callaghan, Caitlin, Danielle Peterson, Timothy Cooke, Brandon Booker i Kathryn Trubac. Installation resilience in cold regions using energy storage systems. Engineer Research and Development Center (U.S.), październik 2021. http://dx.doi.org/10.21079/11681/42200.

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Electrical energy storage (EES) has emerged as a key enabler for access to electricity in remote environments and in those environments where other external factors challenge access to reliable electricity. In cold climates, energy storage technologies face challenging conditions that can inhibit their performance and utility to provide electricity. Use of available energy storage technologies has the potential to improve Army installation resilience by providing more consistent and reliable power to critical infrastructure and, potentially, to broader infrastructure and operations. Sustainable power, whether for long durations under normal operating conditions or for enhancing operational resilience, improves an installation’s ability to maintain continuity of operations for both on- and off-installation missions. Therefore, this work assesses the maturity of energy storage technologies to provide energy stability for Army installations in cold regions, especially to meet critical power demands. The information summarized in this technical report provides a reference for considering various energy storage technologies to support specific applications at Army installations, especially those installations in cold regions.
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Zhou, Xiao-Dong, Yudong Wang i Emir Dogdibegovic. High Performance SOFCs with a Superior Stability for Reliable and Durable Power Systems. Office of Scientific and Technical Information (OSTI), kwiecień 2022. http://dx.doi.org/10.2172/1872368.

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Hynd, David, Caroline Wallbank, Jonathan Kent, Ciaran Ellis, Arun Kalaiyarasan, Robert Hunt i Matthias Seidl. Costs and Benefits of Electronic Stability Control in Selected G20 Countries. TRL, styczeń 2020. http://dx.doi.org/10.58446/lsrg3377.

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This report, commissioned by Bloomberg Philanthropies, finds that 42,000 lives could be saved and 150,000 serious injuries prevented by 2030 if all new cars in seven G20 countries were required to be equipped with an inexpensive crash avoidance technology starting in 2020. Thirteen G20 counties currently adhere to United Nations regulations on electronic stability control (ESC). If the seven remaining countries—Argentina, Brazil, China, India, Indonesia, Mexico and South Africa—also mandated ESC in 2020, the report estimates $21.5 billion in economic benefit to those countries from the prevention of deaths and serious injuries. Argentina and Brazil are due to start applying ESC regulations in 2020. The UK-based Transport Research Laboratory (TRL) conducted the independent study of costs and benefits of applying ESC regulation in G20 countries, which are responsible for 98% of the world’s passenger car production. This report comes before the 3rd Ministerial Conference on Road Safety in Stockholm, which is the largest gathering of governments and is a key opportunity for adoption of this UN-recommended standard. According to the World Health Organization’s Global Road Safety Report, the number of road traffic deaths reached 1.35 million in 2016. Of all vehicle safety features, electronic stability control is regarded as the most important one for crash avoidance since it is 38% effective in reducing the number of deaths in loss-of-control collisions. ESC tries to prevent skidding and loss of control in cases of over-steering and under-steering. The technology continuously monitors a vehicle’s direction of travel, steering wheel angle and the speed at which the individual wheels are rotating. If there is a mismatch between the intended direction of travel and the actual direction of travel, as indicated by the steering wheel position, ESC will selectively apply the brakes and modulate the engine power to keep the vehicle traveling along the intended path. The cost of implementing ESC on vehicles that already contain anti-lock braking systems is thought to be as little as $50 per car. And the report finds the benefits are significant: For every dollar spent by consumers in purchasing vehicles with these technologies, there is a US$2.80 return in economic benefit to society because of the deaths and serious injuries avoided. The analysis warns that without regulation of ESC, the seven remaining G20 countries will only reach 44% installation of ESC by 2030. However, if all seven countries implemented ESC regulations this year, 85% of the total car fleet in G20 countries will have ESC by 2030, a figure still below the United Nations target of 100% ESC fleet coverage by 2030.
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Financial Stability Report - Second Semester of 2021. Banco de la República, wrzesień 2022. http://dx.doi.org/10.32468/rept-estab-fin.sem2.eng-2021.

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Banco de la República’s main objective is to preserve the purchasing power of the currency in coordination with the general economic policy that is intended to stabilize output and employment at long-term sustainable levels. Properly meeting the goal assigned to the Bank by the 1991 Constitution critically depends on preserving financial stability. This is understood to be a general condition in which the financial system assesses and manages the financial risks in a way that facilitates the economy’s performance and efficient allocation of resources while, at the same time, it is able to, on its own, absorb, dissipate, and mitigate the shocks that may arise as a result of adverse events. This Financial Stability Report meets the goal of giving Banco de la República’s diagnosis of the financial system’s and its debtors’ recent performance as well as of the main risks and vulnerabilities that could affect the stability of the Colombian economy. In this way, participants in financial markets and the public are being informed, and public debate on trends and risks affecting the system is being encouraged. The results presented here also serve the monetary authority as a basis for making decisions that will enhance financial stability in the general context of its objectives. In recent months, several positive aspects of the financial system have preserved a remarkable degree of continuity and stability: the liquidity and capital adequacy of financial institutions have remained well above the regulatory minimums at both the individual and consolidated levels, the coverage of past-due loans by loan-loss provisions remains high, and the financial markets for public and private debt and stocks have continued to function normally. At the same time, a surge in all the types of loan portfolios, a sharp downturn in the non-performing loan portfolio, and a rise in the profitability of credit institutions can be seen for the first time since the beginning of the pandemic. In line with the general recovery of the economy, the main vulnerability to the stability of the Colombian financial system identified in the previous edition—uncertainty about changes in the non-performing loans portfolio—has receded and remains on a downward trend. In this edition, the main source of vulnerability identified for financial stability in the short term is the system’s exposure to sudden changes in international financial conditions; the results presented in this Report indicate that the system is sufficiently resilient to such scenarios. In compliance with its constitutional objectives and in coordination with the financial system’s security network, Banco de la República will continue to closely monitor the outlook for financial stability at this juncture and will make the decisions necessary to ensure the proper functioning of the economy, facilitate the flow of sufficient credit and liquidity resources, and further the smooth functioning of the payment system. Leonardo Villar Gomez Governor Box 1 -Decomposition of the Net Interest Margin in Colombia and Chile Wilmar Cabrera Daniela Rodríguez-Novoa Box 2 - Spatial Analysis of New Home Prices in Bogota, Medellín, and Cali Using a Geostatistical Approach María Fernanda Meneses Camilo Eduardo Sánchez Box 3 - Interest Rate Model for the SYSMO Stress Test Exercise Wilmar Cabrera Diego Cuesta Santiago Gamba Camilo Gómez Box 4 - The Transition from LIBOR and other International Benchmark Rates Daniela X. Gualtero Briceño Javier E. Pirateque Niño
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