Tadeusz Sikora

On Wind Power Station Production Prediction

The paper deals with results following from the research of prediction of wind power plant production. The model was developed at VsB – Technical university of Ostrava and it is based on knowledge of weather forecast and power curve of predicted wind power plant. To improve accuracy of prediction several correction mechanisms are adopted. In conclusion, the paper describes comparison of predicted values and measured values.

The influence of fluctuation in the luminous flux of light sources and its quantification

Voltage fluctuations in the distribution network affect the fluctuation of the luminous flux of light sources which are fed by this network. This phenomenon is quantified in standard ČSN EN 61000-4-15 which defines the method of measuring and evaluating the so-called flicker (flicker factor). This parameter can have a very negative effect on human comfort or even health. In the above standard, the method of measurement is defined for a 230 V / 60 W lamp (bulb) source. Together with the growing use of modern light sources, we can therefore expect the mitigation of the flicker effects as well as the updating of the mentioned standard.

Power network reliability computations using multi-agent simulation

The reliability of a power network as a whole is limited by the reliability of the weakest element in the network. Ensuring the reliability just with nothing more than a readiness to repair or replace broken parts is not feasible economically, and planned element replacements in the middle of their working life is often a waste of working resources. This article presents a multi-agent simulation system designed for modelling all aspects of power network elements and power network processes. The modelling of this system is able to predict the weak points of a simulated power network over an extended time span (decades). This mode of prediction takes into account the network topology, which means that each element is modelled in a context that is close to the real one. To show the system capabilities, we present two models of computations based on real power networks of 10 kV. Both models make use of the main feature of the system, which is the ability to use local interactions even for global analytic computations, such as the computation of a power network steady state or locating the least reliable point in the network.

Linear octapolar radiofrequency tool for liver ablation

These work deals about the design and realization of linear octopolar radiofrequency surgical tool for liver ablation. The radiofrequency surgical technique is one of most significant methods for trauma and oncology radical therapy nowadays. This contribution deals about new surgical type design and testing with comparison of commercial present tools.

Operation analysis of automated parking system with off-grid supply system

Automated parking system (APS) is a mechanical system designed to minimize the area and/or volume required for parking cars. It is a solution for areas with a minimum place to parking, especially in city center. Sometimes there are some APS which are equipped with charge station for E-vehicle. Respecting power consumption of APS and possible charging stations there should be a problem with supply whole facility via distribution network (in city center usually cable lines). Cable lines are usually tens of years old with a limited transmission capacity and very expensive and technologically demanding modernization. One of the possible solutions how supply APS equipped with charging station is an application of renewables together with storage devices. We introduce power supply system for APS based on renewables and storage devices with possibility to operate in off-grid mode in this paper. Description of monitoring system is also included. A basic analysis of operation of the APS with off-grid supply system is presented in the second part of the paper.

Wiring and protection of an Off-Grid system

A description of the Off-Grid power supply systems and their wiring concept, as well as their protection possibilities, are specified in this article. The previously mentioned Off-Grid power supply systems are primarily designed for customers with a household type: AC main bus connection in By-Pass concept, and a DC main bus connection.

Linear Surgical Instrument for Bipolar Multielectrode Radiofrequency Ablation

The aim of the work is about the design and realization of linear surgical instrument for bipolar multielectrode radiofrequency ablation. The Radiofrequency intervention is more used in an abdomen surgical technique. The present tools are universal for most of the operation with several disadvantages for large ablation. Our designed and tested surgical tool consist of ten needles linear electrodes bipolar driven by existing standard used generators. Proposed surgical tool, in comparison with existing tools, used in extended ablation saves significant part of healthy tissue and also operational time.

Modelling three-phase power network with a multi-agent system

Multi-agent systems have already proven to be useful for modelling processes in distributed environments, such as an electricity distribution network. The autonomous design of each network element and its capabilities allows to adapt the model to any situation and the results can be used for monitoring as well as real time control. One disadvantage of such models lies in a seeming inability to evaluate global analytical computations. In this paper, we show how such computations can be performed within a power network simulation system by means of purely local interactions and an iterative communication flow. The results are then compared to a standard analytical approach.

Smart power network reliability modelling using intelligent agents: Exploring economic aspects of the power distribution network reliability

In the paper we present a model of a power distribution network based on a combination of the stochastic and deterministic approach. The simulation system is implemented using multi-agent platform eXAT and it is based on local knowledge transfer and interaction between agents. By recording the events occurring in the network and post-hoc analysis, we are able to explore the relations between local failures and their global economic effects in the distribution network.