ERROR:SQLSTATE[HY000]: General error: 20018 Invalid column name 'CodigoInstitucion'. [20018] (severity 16) [SELECT PublicObrasAutores.NumeroEmpleado, PublicObrasAutores.ApellidoPaterno, PublicObrasAutores.ApellidoMaterno, PublicObrasAutores.Nombre, PublicObrasAutores.NombreCompleto FROM PublicObrasAutores LEFT JOIN PublicObrasAutoresFil ON PublicObrasAutores.RefPublicacion = PublicObrasAutoresFil.RefPublicacion WHERE PublicObrasAutores.RefPublicacion = '503164' AND PublicObrasAutores.NumeroEmpleado IS NULL AND PublicObrasAutoresFil.CodigoInstitucion IS NOT NULL;]
®
ERROR:SQLSTATE[HY000]: General error: 20018 Invalid column name 'CodigoInstitucion'. [20018] (severity 16) [SELECT PublicObrasAutores.NumeroEmpleado, PublicObrasAutores.ApellidoPaterno, PublicObrasAutores.ApellidoMaterno, PublicObrasAutores.Nombre, PublicObrasAutores.NombreCompleto FROM PublicObrasAutores LEFT JOIN PublicObrasAutoresFil ON PublicObrasAutores.RefPublicacion = PublicObrasAutoresFil.RefPublicacion WHERE PublicObrasAutores.RefPublicacion = '503164' AND PublicObrasAutores.NumeroEmpleado IS NULL AND PublicObrasAutoresFil.CodigoInstitucion IS NULL;]
®
ERROR:SQLSTATE[HY000]: General error: 20018 Invalid column name 'Institucion'. [20018] (severity 16) [SELECT Institucion FROM PublicObrasAutoresFil WHERE RefPublicacion = '503164']
®
ERROR:SQLSTATE[HY000]: General error: 20018 Invalid column name 'Institucion'. [20018] (severity 16) [SELECT Institucion FROM PublicObrasAutoresFil WHERE RefPublicacion = 503164 AND InstitucionPropia = 'S'
UNION
SELECT Adscripciones.Entidad FROM PublicacionesObras
JOIN PublicObrasAutores ON PublicacionesObras.Identificador = PublicObrasAutores.RefPublicacion
JOIN Adscripciones ON PublicObrasAutores.NumeroEmpleado = Adscripciones.NumeroEmpleado
WHERE (PublicacionesObras.FechaPublicacion BETWEEN Adscripciones.FechaDesde AND Adscripciones.FechaHasta OR (PublicacionesObras.FechaPublicacion >= Adscripciones.FechaDesde AND Adscripciones.FechaHasta IS NULL)) AND PublicacionesObras.Identificador= 503164]
SIIA Público
SISTEMA INTEGRAL DE INFORMACIÓN ACADÉMICA - PÚBLICO
Título del libro: 2015 Ieee Innovative Smart Grid Technologies - Asia (isgt Asia) Título del capítulo: Smart Frequency Control in Power Transmission Systems Using a BESS
Autores UNAM: LUIS MIGUEL CASTRO GONZALEZ;
Autores externos: Idioma: Año de publicación: 2015Palabras clave:
BESS; DC-DC converter; VSC; Simulink; Frequency control; Power transmission systems
Resumen:
This paper reports on an investigation of the impact of a two-stage
battery energy storage system (BESS) on the voltage and frequency
stability of a power transmission system. The BESS's two stages are: a
DC-DC converter and a DC-AC converter connected in tandem. System
stability is a major concern in power system transmission and it has
long been acknowledged that battery energy storage would be a possible
way forward to improve power system stability, but the battery
technology and the ancillary power electronics have not been developed
sufficiently, until quite recently, to meet such expectations. The
two-stage BESS is able to mimic the operation of a conventional
synchronous generator plant but with a faster speed of response because
of its lack of rotating parts - it is in fact an electronic power plant.
The results show that the BESS does improve power system frequency
stability very significantly.
