Vladimir Mikuličić

Small wind off-grid system optimization regarding wind turbine power curve

Paper is presenting results from modeling of small hybrid off-grid system. The system is built from solar photo voltaic, wind, and diesel power sources. Realistic data were used regarding predicted solar global radiation, wind speeds, and load. Simulation was performed with HOMER micropower optimization tool. Special focus was put on the estimation of how wind turbine power curve can influence cost of energy and amount of electrical energy produced from the available wind. Keeping the rest of system unchanged five different wind turbine power curves was evaluated. System configuration is changed only regarding optimal number of some components (i.e., photovoltaic power, battery and charger/inverter capacity). Results are showing the influence of wind turbine power curve both on the cost of energy and optimal system configuration.

Estimation of electrical energy not supplied in reliability analysis of distribution networks

There are many aspects about the electrical energy not supplied (EENS) price, about estimation of the economies losses and the social economic benefit losses in the different kinds of human activity, education and life or about similar estimation in suppliers money losses due to not charged EENS. Detailed technical analyzes of some real power system faults, real demands and real deliveries are described in this paper. The EENS quantity evaluation during real power lines faults is given here. Power supplier aspect of the EENS evaluation is presented in the paper. Fault period without voltage of the day is compared with the same time period of the next or previous day. The values of EENS calculated until now have been overestimated due to magnified initial power demand neglects. The real value of EENS is evaluated by integrating function power (or electric current) in depends on time for each day (two consecutive days).

Computing the Top Event Uncertainty with Binary Decision Diagrams

This paper is discussing uncertainty quantification for the PSA model represented by BDD. First, it is discussed about uncertainty quantification of PSA model with BDD. Second, it is investigated about the difference in the quantified top event uncertainty between common partial uncertainty quantification approach and BDD approach.

Power System Fault Data and Time Series

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.

Unavailability Analysis Of Diesel Generators System Supplying Telecommunications Equipment

Power supply system (composed of electric power system, cables, rectijiers, etc.) is used in telecommunications offices to supply uninterruptible DC power to telecommunications system such as switching system and transmission systems. However, all telecommunications functions in an oflee will stop if the power system fails. Therefore a stand-by energy system composed of batteries and diesel generators system is used as a back-up system for commercial electric power system. A reliability program process can be interwoven into current operational activities to help in controlling, analysing, and predicting faults that can challenge this back-up system. The objective of such a reliability program is to help maintain an acceptable level of availability throughout the operating lifetime of a back-up system. In this paper consequently special consideration is given to diesel generators unavailability evaluation using Fault Tree Analysis (FTA).