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Two-stage Transient-stability-constrained Optimal Power Flow for Preventive Control of Rotor Angle Stability and Voltage Sags

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Journal of Modern Power Systems and Clean Energy 2024年第5期12卷 1357-1369页

作者： jorge uriel sevilla-romero Alejandro Pizano-Martínez Claudio Rubén Fuerte-Esquivel Reymundo Ramírez-Betancour the Faculty of Electrical Engineering Universidad Michoacana de San Nicolás de Hidalgo58030 MoreliaMéxico the Department of Electrical Engineering Universidad of Guanajuato36787 SalamancaMéxico the Department of Electrical and Electronic Engineering Universidad Juárez Autónoma de Tabasco86040 VillahermosaMéxico

In practice,an equilibrium point of the power system is considered transiently secure if it can withstand a specified contingency by maintaining transient evolution of rotor angles and voltage magnitudes within set bounds.A novel sequential approach is proposed to obtain transiently stable equilibrium points through the preventive control of transient stability and transient voltage sag(TVS)problems caused by a severe *** proposed approach conducts a sequence of non-heuristic optimal active power re-dispatch of the generators to steer the system toward a transiently secure operating point by sequentially solving the transient-stability-constrained optimal power flow(TSC-OPF)*** the proposed approach,there are two sequential projection stages,with the first stage ensuring the rotor angle stability and the second stage removing TVS in voltage *** both projection stages,the projection operation corresponds to the TSC-OPF,with its formulation directly derived by adding only two steady-state variable-based transient constraints to the conventional OPF *** effectiveness of this approach is numerically demonstrated in terms of its accuracy and computational performance by using the Western System Coordinated Council(WSCC)3-machine 9-bus system and an equivalent model of the Mexican 46-machine 190-bus system.

关键词： Dynamic security assessment transient stability transient voltage sag(TVS) optimal power flow(OPF)

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A nitrogen index for improving nutrient management within commercial Mexican dairy operations

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International Soil and Water Conservation Research 2016年第1期4卷 1-5页

作者： uriel Figueroa-Viramontes jorge A.Delgado Juan I.Sánchez-Duarte Esmeralda Ochoa-Martínez Gregorio Núñez-Hernández INIFAP Campo Experimental La LagunaBoulevard JoséSantos Valdez#1200 Pte.Col.CentroMatamoros C.P.27440Matamoros CoahuilaMexico USDA ARS2150 Centre AvenueBuilding DFort CollinsCO 80526United States

Some intensive dairy operations in Mexico are contributing to large,negative environmental impacts,especially in regions dominated by high concentrations of *** manure inputs plus additional nitrogen(N)fertilizer has,in some cases,resulted in background nitrate–nitrogen(NO3–N)levels in irrigation water that are so high,it is not safe for human *** reason is that commercial farmers in this region are currently not using any method to rapidly calculate N budgets based on their practices,N inputs and/or crop N *** Nitrogen Index,a quick tool that can be used to conduct an assessment within a few minutes,was developed for Mexico,but needed further testing under commercial field *** conducted studies in 2010 and 2011 and collected soil and crop information from several commercial farming operations to test the *** index accurately assessed(Po0.0001)residual soil nitrate after harvesting corn(Zea mays L.)and oats(Avena sativa L.);and also accurately assessed the N uptake of these crops(Po0.01).The Mexico N Index is a tool that can be used to quickly conduct N balances,show when N is being over-applied,and help reduce over-application,thus reducing N losses to the environment and improving management of dairy forage systems in Mexico.

关键词： Corn Forage systems Manure Mexico Nitrate leaching Nitrogen Index

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Stem Population and Tissue Replacement of <i>Urochloa</i>in Different Phenological Stages

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American Journal of Plant Sciences 2020年第8期11卷 1296-1306页

作者： María de los Ángeles Maldonado Peralta Adelaido Rafael Rojas García Jessica Lizbeth Ruíz Clavel Herminio Aniano Aguirre Filiberto Magadan Olmedo Leopoldo jorge Castañeda uriel Mondragón Calderón Universidad Autónoma de Guerrero Facultad de Medicina Veterinaria y Zootecnia Cuajinicuilapa Guerrero México Tecnológico Nacional de México Campus Instituto Tecnológico de Pinotepa Pinotepa Nacional Oaxaca México

The objective of the present investigation was to evaluate the Urochloa Insurgent, Piata and Signal grasses by varying the phenology in the attributes: stem population dynamics, tissue replacement, leaf:stem relation and weight per stem. The data were analyzed using a completely randomized block design with arrangement in divided plots and four replications, the procedure used was PROC GLM from SAS. The Signal grass presented higher stem density with an average of 450 m?2 stems, while the meadow with Insurgent grass registered the lowest stem density throughout the investigation, with an average of 320 m-2 stems;furthermore, in this treatment, the stem density tended to increase slowly over time (P = 0.05). The Insurgente and signal grasses showed rapid leaf elongation from day 21 of regrowth with 123 and 104 cm stem?1, while in Piata the accelerated leaf elongation was on day 14 with 113 cm stem?1 where it remained active its growth until day 56 (P > 0.05). As the regrowth age was increasing, the population dynamics of stems and weight per stem were increasing;in Insurgent and signal the leaf elongation and net growth increased to a maximum point to start declining;however, in Piata grass was increasing without decreasing. The trend of the leaf:stem relation was decreasing as the test progressed and senescence increased from day 21 of regrowth.

关键词： Urochloa Stem Population Leaf Elongation Weight Per Stem

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