The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper proposes a statistical analysis of photovoltaic output power and solar radiation for a photovoltaic system located in Iasi, Romania. The photovoltaic system performance can be analyzed using the correlation coefficients between the photovoltaic output energy and amount of global irradiance during different reference periods.
Based on a previously detailed data mining about primary renewable sources concerning solar radiation and wind speed, the authors present some results related to reliability of supply using Bayesian networks (BNs). The paper focuses on how the structure and parameters of BN can be obtained from the data. A short review of learning methods, scoring function types and specific algorithms is included...
This paper focuses on an analysis on compatibility between power grid quality voltage and dispatchable photovoltaic plant integration. In this order, based on a simulation, voltage dips have been calculated on the bus bars of a test system (IEEE-RTS). The method for voltage dip estimation used in this paper provides the frequency of voltage dips, due to symmetrical and unsymmetrical faults in the...
The availability indices of a grid-connected photovoltaic system, with and without backup energy storage, have been quantitative and qualitative analyzed in this paper. The analyses allow identification of photovoltaic system components whose reliability should be improved in the operational stage. In order to evaluate availability indices, the LACARP PV system structure has been considered in this...
Around the whole world, electric energy from photovoltaic systems is considered as an important generation alternative in the electric power system. A measure of the photovoltaic system's performance is given by the energy production as well as the system efficiencies, evaluated for different reference periods. In this paper, the photovoltaic system of Applied Research Laboratory Iasi, Romania has...
As the sparks produced by a conventional spark plug do not assure each time a complete combustion of the gasoline into the internal combustion engines, among different types of solutions given by worldwide researchers and car manufacturers (pulsed laser ignition, multi-ignition points systems, multi-electrodes spark-plugs etc.) we have proposed and tested a new type of ignition system that has as...
This paper reviews the importance of improving the power supply quality. It presents the main stages for a study of amelioration or improvement of the power quality. A basic description of accounting of the damages caused by poor quality of the electric power is given together with different examples. Then, solutions for pay-back possibility of the quality costs for electric power suppliers and power...
The paper presents some results concerning the availability of the wind. The authors' main idea is to consider the wind as a “repairable” system and consequently to estimate the probability distribution functions of the random variables: TBE — time between events and TTR — time to repair as well as their parameters. Depending on these type of distributions, a Markov or semi-Markov could be used for...
Electric power from wind energy systems is considered as an important generation alternative in the electric power systems, around the whole world. A measure of the wind energy performance is given by the annual energy production, as well as the capacity factor value. In the paper, a probabilistic model is used to evaluate the main effects of wind profile in the energy system performance. The probabilistic...
The authors present a method to evaluate the power quality during the design stage of the electricity supply solutions. Actually, the power quality analyzers or dedicated measurement systems are used to detect and to solve power quality problems but the paper covers a relative poor research field: that of anticipating power quality before the network was put into operation. The method is a combination...
The paper covers the power quality — light sensitivity relationship from two perspectives, both affecting the human eye and health: first is the voltage perturbation known as flicker phenomenon and the second is related to the light emission of PC monitors and TV screens. These second light sources are referring especially to the content of the PC software and to the TV programs corresponding to the...
This paper focuses on an analysis of accuracy degree of a photovoltaic panel model. Therefore, a brief review of one-diode model having in view the main analytical equations of this model is presented in the paper. Based on this model and its required parameters evaluated based on the datasheet of panel, various simulation studies have been carried out in order to evaluate the influence of irradiance...
Ancillary services associated to a power system are those services that support the Transmission System Operator to ensure the requirements concerning the safe, security and reliability of the power system. Real-time behaviour of these services can be assessed using the adequacy indices of generation system. The main objective of this paper is to analyse the evolution in time of hourly values of tertiary...
Electric power from wind energy systems is considered as an important generation alternative in the electric power systems around the whole world. A measure of the wind energy system's performance is given by the amount of annual energy production. In the paper, an analytical model is developed to evaluate the main influence of the wind turbine's reliability in the energy system performance. First,...
Three different maintenance strategies are presented from theoretical approach to a practical study case: first come — first served — FCFS, relative priority — RP and total priority — TP. The useful results shows how to include the maintenance strategies in reliability calculations and their influence on the reliability indices like steady-state point availability, steady-state time interval reliability,...
In this paper a method for reliability estimation of power systems including wind energy generators is presented. The method is useful to compare different wind turbine generator types and to establish the suitable wind generator type in a given area. The wind generator parameters to be considered for an optimal selection are also presented in details, having in view the improvement of system reliability...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.