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Providing workers with telecommunication services in the Arctic is a very important task. To supply devices with power petrol and diesel generators are traditionally used. Delivery of fuel to the Arctic is difficult, unprofitable and threatening the environment. The authors suggest use alternative energy sources for autonomous satellite communications platform power supply. The work deals with the...
Areas missing wide electricity grid deployment require set-up of local and small scale grids (nano-grids) covering individual or group of houses. Such systems require a performance/cost optimisation. A simulation has been developed to evaluate management algorithms. A 15 % optimisation through the use of simple predictive algorithms is demonstrated.
Observability of synchronous generators' dynamic parameters has significant contribution in the design of the parameter identification method of the generators. Subsequently, it has a serious impact on the accuracy level of the transient stability analysis of electrical power systems. This work is devoted to the observability analysis of these parameters in the generator dynamic performance. It has...
An increased share of variable speed wind turbines reduces the inertia of the power system due to the decoupling of mechanical rotor frequency and grid frequency. In the recent years, a lot of research has been done about exploitation of the rotating mass of a wind turbine for participation in the primary frequency regulation of the power system. This paper proposes a linearized general variable speed...
The incidence of sudden unanticipated variations in power system states and parameters will tend to increase due to higher intermittent renewable energy penetration in distributed generation. It is needed to have proper state and parameter estimation tools that can follow-up these variations and can reflect the real-time system dynamics. In this paper, a particle filter with Nelder-Mead simplex optimization...
In this paper a cuckoo search based multi-objective optimal design of permanent magnet disc motor is proposed. In this research, the Cuckoo search technique is used as a search tool in the process of optimal design of a permanent magnet disc motor. The optimization search is based on the value of the objective function. The Cuckoo Search in general is a minimisation search algorithm and therefore...
In this paper a novel methodology for analysis of electrical machines using finite element method is presented. At the beginning a short presentation of the investigated motor as well as the basic topologies, performance properties and characteristics is presented. Afterwards a brief presentation of the finite element method and its application in design and analysis of electrical machines is introduced...
The paper addresses the possibilities of application of discrete Short-time Fourier transform (STFT) and Fast Fourier transform (FFT) for detection of voltage dips in the distribution grid with high level of distributed generation in the concept of the future smart grids. Modelling and testing are carried out in the MATLAB/SimPowerSystems environment. Modified IEEE13 bus system with high level of...
The aim of this paper is to describe diagnostic tests which measure capacitance and factor of dielectric losses of transformers' insulation system. Transformers insulation system consists of paper insulation and insulating oil. The factor of dielectric losses is the ratio of active and reactive components of current and as such reflects changes of both currents. It is less dependent on dimensions...
Continuous development of electrical power systems has resulted in very complex relay protection system with associated numerical protection algorithms. Reliability, selectivity and speed are the basic design requirements for the development of new algorithms. Ideally the amplitude estimation algorithms should determinate the amplitude as fast as possible, theoretically with just one sampled value...
One of the biggest threats for the security of power grids are congestion of cross-border lines and congestion in the network itself as result of parallel flows. Nowadays, occurrence of congestion is a result of limited network transfer capacities as a direct consequence of increased power transactions. One of the reasons for cross-border congestions are the unreal cross-border capacities calculations...
Wind speed plays a vital role for wind energy calculation of a certain location. Appearances and variations of monthly wind speed data in the Republic of Macedonia were analyzed in this paper. Five measuring stations, placed across are the base source for the measured data. Primarily, the data are summarized and represented graphically by time series plots for seasonal analysis. We have compared wind...
The paper analyses the impact of energy storage and electric vehicles to the flexibility of electric power system in terms of securing reserves for covering deviations between consumption and generation of electricity, taking into account the share of non-predictable renewable sources in the network. Over the last few years, the share of renewable sources has increased, and wind power contributes...
Electric cars in the worldwide vehicle stock have reached sizeable growth since 2010. Besides proven benefits to the sustainable development and wheel-to-wheel efficiency, electric cars can provide side benefits to car owners and to power system utility. Plug-in vehicles can behave either as loads or as a distributed energy and power resource in a concept known as vehicle-to-grid (V2G). This paper...
Recently, FPGA-based NCS applications have been widely used. Industrial environments have a lot of electromagnetic interference which may induce transient and permanent faults. As a result, Fault-Tolerant FPGA based NCS applications are required. In this paper, an NCS model composed of a combination of S2A architecture and In-Loop architecture connected to each other through Ethernet switch, is described...
Nowadays, the number of divers who want to practice the activity at technical level grows more and more. The Rebreather apparatus can be used to carry out such an experience. This underwater breathing equipment seems to be a complex system, but it is based on a very simple concept: the reuse of the exhaled gas. This apparatus is controlled by an electronic system, a specialized dive computer, that...
In this paper, a new and novel printed structure is proposed to obtain high quality factor (Q-factor) coil antenna in wireless power transmission system. The main idea to achieve high quality factor is “adjusted line pitch and width” with respect to outer diameters. The line pitch and width of the printed pattern are gradually increased in proportion with outer diameter. By using this design method,...
In this paper, after a brief introduction on the developed plug-and-play (PnP) process monitoring and control architecture, a decentralized plug-and-play (PnP) process monitoring system for large-scale industrial processes is studied. And then, aiming at lower online computational load and more flexible industrial implementation, a decentralized adaptive configuration technique is further developed...
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