Towards a New Model of Evaluation of Transformation Losses in Solar Orchards

In this article is analyzed the economic yield that would turn out from replacing the conventional transformers currently used on solar orchards by others of higher performance. In this way, the losses would be reduced increasing at the same time the injected energy to the network. Moreover, it would have a beneficial effect in the efficiency of the global installation including the connection to the distribution network

DCOPF Contingency Analysis Including Phase Shifting Transformers

This work deals with a new formulation for the Direct Current Optimal Power Flow (DCOPF) including the corrective actions related to the phase shifting transformers. The formulation is based on the outage of generators and/or branches modelled as fictitious injections of active power. The inclusion of the sensitivities of the phase shifting transformer with respect to the injected powers is one of the novelties of this paper. By including the fictitious injections in the optimization problem, the injections are adjusted to the post-contingency state as a consequence of the corrective actions carried out by the DCOPF to bring the system back to its normal state. Consequently, when the analysis of contingencies is performed, the classical topological analysis and the subsequent analyses are avoided with this approach. The DCOPF includes as corrective control variables the rescheduling of active power generations, phase shifting transformers and, if required, permitted load shedding. The IEEE-RTS of 24 buses is used as benchmark network to assess the properties of the proposed approach.Spanish Ministry of Science and Innovation and Cooperation (Spain) ENE2011-24137Spanish Ministry of Science and Innovation and Cooperation (Spain) ENE2011-27984Junta de Andalucía PO11-TEP741

A new DC corrective OPF based on generator and branch outages modelled as fictitious nodal injections

This work deals with a new formulation for the direct current corrective optimal power flow. The formulation is based on the outage of generators and/or branches modelled as fictitious injections of active power. By including that fictitious injections in the optimization problem, the injections are adjusted to the post-contingency state as a consequence of the corrective actions carried out to bring the system back to its normal state. So, when the analysis of contingencies is performed, the classical topological analysis and the subsequent analyses are avoided with this approach. This new formulation uses the sensitivity matrix between branch power flows and powers injected in a power system. An important feature of this matrix is to remain constant during the Contingency Analysis performed for the generation-load scenario (base case) of each period of time to be analysed. The approach proposed is illustrated in the IEEE-RTS of 24buses. The results obtained in this distribution network demonstrate that the proposed methodology can assess the impact of contingencies with an acceptable accuracy and a short computation time.Spanish Ministry of Science and Innovation grant ENE2011-27984Spanish Ministry of Science and Innovation grant ENE2010-18867Junta de Andalucía TEP-517

Experimental Assessment of a Centralised Controller for High-RES Active Distribution Networks

This paper assesses the behaviour of active distribution networks with high penetration of renewable energy sources when the control is performed in a centralised manner. The control assets are the on-load tap changers of transformers at the primary substation, the reactive power injections of the renewable energy sources, and the active and reactive power exchanged between adjacent feeders when they are interconnected through a DC link. A scaled-down distribution network is used as the testbed to emulate the behaviour of an active distribution system with massive penetration of renewable energy resources. The laboratory testbed involves hardware devices, real-time control, and communication infrastructure. Several key performance indices are adopted to assess the effects of the different control actions on the system’s operation. The experimental results demonstrate that the combination of control actions enables the optimal integration of a massive penetration of renewable energy.Ministerio de Economía y Competitividad ENE2015-69597-RMinisterio de Economía y Competitividad PCIN-2015-043Ministerio de Economía y Competitividad ENE2017-84813-

Actuaciones correctoras para el control de tensiones en redes de distribución y de los flujos de potencia reactiva en los transformadores transporte/distribución

El objetivo del trabajo que se presenta en este artículo consiste en el desarrollo de técnicas para la determinación de actuaciones sobre ciertas variables de control, a disposición de los gestores de redes de distribución, para mantener las tensiones de los nudos en la red mallada de distribución y los flujos de potencia reactiva por los transformadores transporte/distribución dentro de los límites establecidos, manteniendo al mismo tiempo un adecuado margen de actuación en las variables de contro

Una visión global para la actividad de invernada

n.d.Fil: MARCOLINI, Silvina Beatríz - Facultad Ciencias Económicas y Estadística - Universidad Nacional de Rosario - Argentin

Exploiting the use of DC SCOPF approximation to improve iterative AC SCOPF algorithms

This paper focuses on improving the solution techniques for the AC SCOPF problem of active power dispatch by using the DC SCOPF approximation within the SCOPF algorithm. Our approach brings two benefits compared to benchmark SCOPF algorithms: it speeds-up the solution of an iterative AC SCOPF algorithm thanks to a more efficient identification of binding contingencies, and allows improving the objective by an appropriate choice of a limited number of corrective actions for each contingency. The proposed approach is illustrated on 5 test systems of 60, 118, 300, 1203, and 2746 buses

Información financiera en la actividad avícola

En la producción avícola, a diferencia de la mayoría de las agropecuarias, conviven los activos biológicos que generan su propio crecimiento hasta estar en condiciones de venta como tales o como productos agropecuarios, los que generan activos biológicos y/o productos agropecuarios y estos últimos. Si bien puede no ocurrir necesariamente en un único establecimiento producti- vo, los sistemas avícolas concentran la producción de carnes y de huevos. En nuestro país, la principal zona productora se ubica en la provincia de Entre Ríos, con estructuras que van des- de granjas familiares capitalizadas a granjas de tipo empresarial, siendo la principal diferencia- ción entre ambas, el grado de incorporación de tecnología para el desarrollo de los procesos productivos. La información financiera debe acompañar a ambos tipos de productores, lo que implica por un lado la generación de informes con aplicación de la normativa contable y por el otro la incorporación de información complementaria de divulgación voluntaria que ayude a la toma de decisiones de productores y terceros.In poultry production, unlike most agricultural products, the biological assets that generate their own growth coexist with those that generate biological assets and / or agricultural products and the latter. While this may not necessarily occur in a single production establishment, poultry systems concentrate meat and egg production. In our country, the main producing area is locat- ed in the province of Entre Ríos, with structures ranging from capitalized family farms to busi- ness-type farms, the main differentiation between them, is about the incorporation of technology for the development of processes productive. The financial information must be useful for both types of producers, which implies, on the one hand, the generation of reports with the applica- tion of accounting regulations and, on the other, the incorporation of complementary information of voluntary disclosure that helps in the decision making of producers and other users.Fil: Marcolini, Silvina Beatriz, Facultad Ciecias Económicas y Estadística de Rosario, Universidad Nacional de Rosario, ArgentinaFil: Verón, Carmen Stella, Facultad Ciecias Económicas y Estadística de Rosario, Universidad Nacional de Rosario, ArgentinaFil: Laguzzi, Javier Alejandro, Facultad Ciecias Económicas y Estadística de Rosario, Universidad Nacional de Rosario, Argentin

Información financiera en la actividad avícola

En la producción avícola, a diferencia de la mayoría de las agropecuarias, conviven los activos biológicos que generan su propio crecimiento hasta estar en condiciones de venta como tales o como productos agropecuarios, los que generan activos biológicos o productos agropecuarios y estos últimos. Si bien puede no ocurrir necesariamente en un único establecimiento productivo, los sistemas avícolas concentran la producción de carnes y de huevos. En nuestro país, la principal zona productora se ubica en la provincia de Entre Ríos, con estructuras que van desde granjas familiares capitalizadas a granjas de tipo empresarial, siendo la principal diferenciación entre ambas, el grado de incorporación de tecnología para el desarrollo de los procesos productivos. La información financiera debe acompañar a ambos tipos de productores, lo que implica por un lado la generación de informes con aplicación de la normativa contable y por el otro la incorporación de información complementaria de divulgación voluntaria que ayude a la toma de decisiones de productores y terceros.In poultry production, unlike most agricultural products, the biological assets that generate their own growth coexist with those that generate biological assets or agricultural products and the latter. While this may not necessarily occur in a single production establishment, poultry systems concentrate meat and egg production. In our country, the main producing area is located in the province of Entre Ríos, with structures ranging from capitalized family farms to business-type farms, the main differentiation between them, is about the incorporation of technology for the development of processes productive. The financial information must be useful for both types of producers, which implies, on the one hand, the generation of reports with the application of accounting regulations and, on the other, the incorporation of complementary information of voluntary disclosure that helps in the decision making of producers and other users.Fil: Marcolini, Silvina Beatriz. Facultad de Ciencias Económicas y Estadística. Universidad Nacional de Rosario. ArgentinaFil: Verón, Carmen Stella . Facultad de Ciencias Económicas y Estadística. Universidad Nacional de Rosario. ArgentinaFil: Laguzzi, Javier Alejandro . Facultad de Ciencias Económicas y Estadística. Universidad Nacional de Rosario. Argentin

Optimal Location of Distributed Energy Resources Considering Investment Costs, Use of Resources and Network Constraints

The consideration of distributed energy resources as non-wires alternatives for the elimination of overloads and voltage problems poses new challenges for their location and management. Traditional location methodologies approach the problem from the distribution system operator perspective, who tries to correct overload and voltage outside margins while minimizing other possible negative impacts in the network. The approach presented in this paper also considers the investor's point of view, seeking the most appropriate technology alternative, the maximum use of the available resource, and the minimum investment. Those aspects are explicitly taken into account in the formulation of the model, which takes the form of a mixed-integer nonlinear optimization problem. The proposed methodology is tested in two different scenarios using the medium-voltage distribution system benchmark of CIGRE. The results show that the interests of the distribution system operator and the investors can be jointly satisfied, achieving an effective, safe and realistic integration of new distributed resources