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The wide range of modern industrial applications demand on extremely high performance of motion control systems in terms of tracking accuracy and therefore control bandwidth. The paper presents a novel dynamic model feedforward quasi-continuous servo drive control approach with regular current feedback sampling implemented on FPGA. Compared to the conventional DSP-based systems the current and the...
This article analyzes the effect of the modulation strategy on the thermal behavior of the power devices in AC drives. Continuous and discontinuous modulation methods will be considered. The effects of the switching frequency and of the fundamental frequency on the temperature of the power devices will also be studied.
Heat treatment of experimental titanium samples using high frequency currents is studied. The velocity of heating is determined depending on the current value on the inductor. Experimental results are compared to the data of finite element method (FEM) modeling of heat transfer in metallic products. The peculiarities of the heating of cylindrical designs of two types: I (diameter — 3.75 mm, length...
In this paper, the simulation environment is proposed that enables accurate full-scale investigation of the pressure adjustment for a centrifugal pump. The novel Matlab model is described, the pumping control procedure is explained, and the simulation results are assessed with the help of an experimental pumping test bench. Basing on thorough inspection of the developed software, the offered toolbox...
The technical solution for smart city concept is offered in the article. The IoT supporting new generation of control concept is developed for smart city paradigm. The offered unified wireless data transmitting concept is deployed as wireless transport vehicles weight control tool. The integrated weight sensor is developed and demonstrated in this article. The offered sensor is integrated in IoT paradigm,...
In this study, the power extraction from oscillating water column device is done by using three level active rectifier and three level inverter which is controlled by using NTV-SV-PWM method. The mid-point balancing of the DC-link is achieved by using a look-up table, aiming to improve the efficiency, the response time of the system and the quality of the power transferred to the grid.
Method of estimating optimal power supply performance parameters with comparison of two different power measurement data analysis methods is introduced. Application of estimating optimal infeed supply converter performance parameters for industrial DC microgrid with multiple DC supplied industrial manipulators and an spot welding process has been analyzed.
Nowadays bulk power system perspective development plans became ineffective, because they do not account for distributed generation implementation, the share of which in total power balance grows steadily from year to year. The paper presents the methodology for existing and prospective distributed generation installed capacity assessment, which combines power statistics, economic and geographical...
Article describes the method to reduce the time waiting of public transport and vehicles before the railway level crossing. One of the proposed methods — optimization of level crossing algorithm. The optimal level crossings time delay depends on the speed of the oncoming train. Time delay prediction algorithm based on track circuits primary parameters and other characteristics.
Reservoir inflow forecasting with artificial neural networks is presented in this paper. Different types of ANN input data were considered such as temperature, precipitation and historical water inflow. Performance of the hourly inflow forecasts was assessed based on a case study of a specific hydropower reservoir in Latvia. The results showed that all the approaches had similar prediction errors...
The paper sets aside details of instrumentality to reveal the nature of the problem addressed by measurement. Its title is based on the title of a 1894 paper by Prof. W.E. Ayrton and his student H.C. Haycraft. They described a new and simplified method of measurement to improve the teaching of their underlying topic, and that is the goal of this paper. In the work described here, the measurand is...
This article is about one of the alternative forms of energy — the algorithm for the development of a sea wave energy converter, which is based on reflection, refraction, diffraction and interference analysis between waves and their energy transformers. This article provides information to the placement of a wave energy converter receiver, specially calculated parallel to the surface, thereby allowing...
Long-term single-phase ground fault in overhead 6–35 kV power lines with isolated neutral, accompanied by intermittent arc, lead to overvoltage and damage of electrical equipment. In turn, precise localisation of the damaged sections of the overhead power lines is a challenging task, as external inspection of power lines takes a lot of time, effort and resources, depending on the surrounding conditions...
The results of experimental measurements of currents and voltages in the elements of cable power lines and communication lines at occurrence of single-phase short-circuit of power cable lines 110 and 220 kV are present. The effect of the short circuits on the operation of the communication cable lines that are laid in the same trench with power cables is evaluated. Explanations to the emerging effects...
Administrative resources of the regulatory body and the number of regulated utilities is an important criteria in selection of price regulation methodology. Estonian experience is based on a large number of relatively small utilities. The price regulation methodology implemented is incentive type of Rate of Return where the important element is the regulatory deterrence, where the company can select...
Surface damage in power plants causes economic loss and waste of operational time in modifications or repair. The wear is caused mainly by solid particles and water droplets. Erosion and corrosion of protective coatings constitute a number of significant engineering difficulties. “Trial and error” type methodology to improve the materials design is rather expensive, inaccurate and time consuming....
Demand side response enables cost optimization for energy systems and consumers. By tradition, the target of the demand side response is to shift the loads from high price or peak-load periods to low price or low consumption periods. The economic effect is derived from reduced energy purchasing costs. This paper focuses on the possibility to provide demand side response for a wind park through direct...
In most countries, electricity is bought and sold at regulated and non-regulated prices. Non-regulated prices are mainly set on the wholesale electricity market and can significantly increase during peak periods due to input of more expensive generation. Another problem, which leads to an increase in prices on the market, is to achieve the carrying capacity of certain sections that does not allow...
Single-switch converters can be an attractive solution for low-cost and low-power applications. This paper studies efficiency improvements from topology modifications of the single-switch galvanically isolated quasi-Z-source DC-DC converter. The following approaches were studied: synchronous rectification in the quasi-Z-source network, implementation of a voltage multiplier rectifier and the multidevice...
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