Bane Popadic

Advanced laboratory setup for control of electrical drives as an educational and developmental tool

A new advanced laboratory setup has been developed on the Faculty of Technical Sciences, Group of Power Electronic and Drives. The idea behind this laboratory setup is to establish a base for research and development work in the field of electrical drives and digital control. It serves as an educational tool for MSc and PhD students, as well as the research foundation with its sophisticated hardware and software arrangements. Basis of the hardware consists of dSPACE platform and its corresponding boards, alongside with industrial converters with custom-made control board, for the development of own personal control techniques. Corresponding software is RealTime Interface block-set and Matlab/Simulink. This paper aims to show a part of research work done on this setup, thus describing its educational and developmental potential.

Voltage dips detection in a system with grid-tie inverter

The paper describes voltage dips detection method in cases of grid-tie inverter systems. A newly developed harmonic estimation algorithm, Reduced FFT (RFFT), has been applied. The grid-tie inverter system has been modelled and simulated in the Matlab/SimPowerSystems environment. Laboratory experiment was carried out with dSPACE control hardware. The voltage dips were produced by grid emulator. For voltage dips detection the algorithm, which is able to monitor the 3rd harmonic is considered suitable in most of the cases. It is shown, both in simulation and experiments that the proposed method is reliable, successful and quick enough. It is much faster than existing ones, i.e. detection time is less than one half-period, so it is more convenient for grid-tie inverter protection purposes.

Reduced FFT algorithm for network voltage disturbances detection

The paper describes Reduced Fast Fourier Transformation (RFFT), an algorithm of harmonic estimation based on the FFT, created by authors, convenient for voltage dips detection. The algorithm is simple, fast, computationally inexpensive and sufficiently accurate. It is tested in Matlab / SimPowerSystems environment. Results show that the algorithm is faster and better than the FFT, which is advantage in applications for network voltage disturbances detection.

Possibility for use of photovoltaic irrignation systems in Republic of Serbia

This paper will present one possible solution of insufficient precipitation during plants vegetative phase using RES. Since the most active period for the majority of agricultural products occurs when available solar energy is at a peak, one could argue that the use of irrigation systems powered by solar energy is the best solution. The paper will compare the classical and the corresponding PV system for irrigation, with their advantages, disadvantages and utilization possibilities. Republic of Serbia solar energy potential will be presented, with special reference on agricultural areas, since the potential on the perspective location will determine the possibility of achieving adequate water supply for irrigation. Differentiating based on the specificities in agricultural areas, the possibility of PV irrigation systems use for different cultivar groups will be discussed. The presented technical solutions will include financial analysis for different types of irrigation systems and the suggestions for cost reduction for PV based irrigation systems.

Future of high power PV plants — 1500V inverters

The paper presents new trends in the development photovoltaic (PV) power plants, with particular reference on new inverter concept with DC-link voltage over 1000 V. For the inverters with the DC-link voltage reaching the value of 1500 V, basic and most important features will be presented. The principle of appropriate PV panel configuration selection in accordance with the inverter voltage input level (1000 V and 1500 V) will be shown, including the necessary equations. The discussion of the results, relative to the inverter input voltage level, will summarize the advantages and disadvantages of the new generation inverters, referenced to as high-voltage inverters.

Control of electrical generator used in sigma wave energy conversion system

Significant increasing in the final energy consumption and limitations of the current energy sector has strongly require development of renewable energy sector. Additionally, efficient harvesting of the locally available potential will become of the utmost importance. In that regard, the international research community has recognized the immense potential of wave energy conversion systems as part of the solution to the increased consumption problem. Even though it is not a novel concept, recently heightened interest in this area has led to important development of the technology. Based on the linear wave theory, this paper will present the basic parameters that specify the amount of available wave energy. The power take-off system based on sigma wave energy converter was assumed and the corresponding control of the electrical generator was applied for the simulation. The paper will present the simulation results, offering the verification of the proposed control strategy with special reference to the achieved capture width value.