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This paper presents advantage of using a FACTS device for dynamic Reactive Power compensation. Simulation model was built in MATLAB Simulink software to prove mathematical constraints. Determination of the most favourable location and size of the compensation devices from the aspect of losses, power quality, costs are calculated as a fitness function developed by genetic algorithm. Optimisation was...
The paper presents an example of modeling high-voltage line with classical columns and pillars compacted with the same lines and testing out the model in the programming tool DIgSILENT with actual measured data for Single Line to Ground Fault with the use of ARs. The parameters of the classical and compacted 400 kV transmission line are entered into the model in the example of 400 kV line Tuzla 4...
In the image analysis, a big trend within the field of artificial intelligence is using the Deep Learning method, which is an upgrade of the existing neural network adaptive architecture (ANN). Deep Learning is a major new field in machine learning that encompasses a wide range of neural network architectures designed to perform various tasks. In the thermography energy sector, examples that are processed...
OTLM (Overhead Transmission Line Monitoring) is a system solution for monitoring and rating of existing and new overhead lines (OHL) based on real-time monitoring of conductor temperature, sag, load, and weather conditions in order to ensure save maximum utilization of transmission line ampacity. Successful development and more than 10 years' of experience in using the OTLM system on transmission...
The paper analyzes ways on how to establish and sustain an active participation of consumers in the modern Smart Grid Architecture based on the Active Demand Approach by proposing the conceptual framework that supports it. The planning and implementation of the power system is a very demanding task, requiring that the electrical energy production and consumption are always equal. In order to efficiently...
This article presents results of high voltage (HV) 400 kV circuit breakers (CB) testing in high induction environment. The most common case of new HV circuit breakers installation is replacement of old circuit breakers in existing power plants or substations. After installation and before energization of any HV equipment it is needed to test and assure the functionality. A circuit breaker, as an important...
The paper presents smart protection device coordination procedure for electrical motor drives connected on distribution network. Protection coordination was in the past performed manually with errors which could cause serious damages to electrical equipment and personnel. Development of computers and software algorithms enabled electrical engineers to provide accurate, useful and easy to use procedure...
Photovoltaic systems as part of larger distribution systems for the production of electricity have non-linear current-voltage characteristics. These characteristics depend on the temperature of the solar cells and insolation of panels. The method for the search of the maximum power or MPPT is widely known, and there are many offered algorithm solutions. The aim of this paper is to present ANFIS (Adaptive...
Power system reliability and continuous electric power supply without downtimes or with a few as shorter as possible interruptions are basic for financial success in today’s power market (EN50160). So, modern customer oriented relationships and efficient electricity service have to be included in nowadays power system management.
This paper aims at applying the Evolutionary Strategy (ES) to capacitor banks optimal allocation problem in the case of multiobjective optimization. The multiobjective optimization includes several objectives such as power losses, capacitor costs and voltage deviation. The multiobjective optimization problem consists of conflicting objectives which need to be simultaneously optimized. Some other constraints...
This paper describes some economic impacts due to power quality disturbances, in the paper mill in the eastern Croatia. Power quality has great importance to all power system operators in modern liberalized energy markets. Voltage sags and short interruptions are probably two of the most serious power quality problems. Total economic losses due to voltage sags are high because there is a significant...
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This paper presents the reliability assessment of the southern part of Croatian transmission network and the influence of the wind farm on reliability indices. Croatian Electric Utility (HEP) Renewable Energy Sources with partner C.E.M.P. is developing wind farm in the region near town Knin. Wind farm will have installed capacity of 100 MW in the first phase. In the second phase additional 40 MW is...
The traditional electric companies operated as a regulated monopoly are separated in those for generation (GenCo), transmission (TransCo) and distribution (DisCo). Demand companies (DemCo), ISO (Independent system operator), and regulator are new companies which enable function of restructured electricity market. Regarding the time dimension, wholesale electricity markets are divided into the two...
Due to construction of a highway in the eastern part of Croatia, a nesurge arrestersw 110/x kV substation was built with two parallel connecting underground cables. Cables were connected to already existing 110 kV overhead lines. At the place where the transition between overhead lines and cables is made, surge arresters were installed. In this paper lightning stroke at the grounding wire on the overhead...
Trough this thesis will be considered the most efficient usage of huge biomass and biogas potential in Croatia considering production of electrical energy and heat. Croatia has a great potential with over 44% of forest area and summ of yearly increase of 9,6 mil. m3, with highly developed wood industry and significant part od agriculture and livestock in economy, and that is a great basis for biomass...
This paper presents a Monte Carlo simulation approach to reliability evaluation of one distribution system. Stochastic model of distribution system components with Weibull distribution and Markov model of components are used. A set of system related reliability indices were calculated using sequential Monte Carlo simulation. The analysis was performed for a planned new 20 kV distribution network dedicated...
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