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The problem of identifying a disturbance and transient duration in power systems at the appropriate time is crucial. The necessity of an early disturbance detection is driven by the essential aims of dispatching control and automatic emergency control systems, both local and centralized. The paper proposes a flexible algorithm for identifying a disturbance and transient duration, based on the "hinge...
Wireless Sensor Networks (WSNs) represent one of the key technologies in Industrial Internet of Things (IloT) applications. Recently, the Open Mote platform has drawn significant attention to IIoT research community. The Open Mote is a representative of new generation open-hardware platforms that is particularly adapted to IIoT applications. The Open WSN is IoT operating system (OS) that incorporates...
In this paper, experiences from founding and teaching a course Software Tools in Electronics are presented. The course teaches students to use basic software tools to document their work, to draw circuit diagrams, to do numeric and symbolic computing, to provide graphical presentation of data, and finally teaches Python both as a programming language and as a tool for numeric computing, symbolic computing,...
Nowadays, DC/DC converters are widely used in industrial applications and renewable energy systems. A SEPIC (single-ended primary inductance converter) DC-DC converter is capable of operating in either step-up or step-down mode and commonly used in a battery charger system. This paper presents the modeling and analyzing of the SEPIC with coupled and uncoupled inductors. In this study, the state-space...
This paper presents an overview and systematic analysis of various design methods for obtaining the observer corrective action gains for stable and precise estimation of synchronous reluctance motor speed. The structure of the reduced order observer consider stator current and extended back electromotive force vectors as observer state variables in stationary reference frame and utilize robust correction...
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...
The grid impedance ratio R/X value is the starting point for several conventional studies, such as DC power flow calculations. The conventional studies can be replaced with more generalized studies, in which the grid impedance ratio plays an important role. This paper presents a generalized droop control approach without the requisite estimation of the grid impedance ratio. Instead of performing large...
This paper investigates applicability of the in-house solver based on the TLM method adapted to the cylindrical grid and improved with the compact wire model for the purpose of EM field characterization using a number of radially placed wire probes within cylindrical cavity resonator. Both an empty and a coaxially loaded cavity have been investigated.
Electric characteristics of Aluminum Conductor Steel Reinforced (ACSR) components, aluminum and steel conductivity values, are usually provided by the ACSR manufacturers, but not the steel core permeability. In order to explore how important the steel core permeability is, the paper deals with the impact of this characteristic on ACSR impedance per unit length. For the estimation of this impact, numerous...
This paper presents the implementation details of a power flow method for unbalanced three-phase distribution networks. The proposed technique utilizes the current injection (CI) method for power flow calculation and considers the modeling of unbalanced loads, load tap-changing (LTC) transformers, and shunts capacitors. Compensation currents are employed for modeling changes in the settings of LTC...
Renewable energy demand increases due to environmentally friendly. Power electronics development enhance the power quality produced. Standalone application multilevel inverter can help in improve rural area which is no electrified. For a multilevel inverter, the output required low total harmonics distortion and voltage boosting character. However, the conventional multilevel inverter are high distortion...
Phase Locked Loop (PLL) is wide used for grid parameters estimation, as well for grid-converters synchronization. Key block at single-phase Synchronous Reference Frame PLL (SRF-PLL) structure is two-phase generator which is used for generation of two quadrature signals, which are necessary for SRF block. One of the issues that could appear during estimation of grid parameters is appearance of DC offset...
In this proceeding we present basic steps for design a system for harmonic and reactive power compensation in smart grid, using photovoltaic (PV) system. First, methods for harmonic monitoring and measurement will be elaborated. Next, we will discuss harmonic reduction techniques that are usually used. The system for harmonic compensation based on photovoltaic energy generation that provides the functions...
In this paper performance analysis of Direct Torque Control (DTC) schemes for control of dual three-phase induction machine is presented. Several hysteresis comparator based DTC schemes with variable switching frequency and a space vector modulation based DTC scheme with constant switching frequency are under the scope. The schemes are modeled and systematically analyzed by intensive computer simulations...
Figure detection, separation and image classification are common problems occurring in various fields, especially medicine. Since image databases are usually large, manual classification would be a demanding task. In this paper, we proposed a method for automatic compound figure detection and separation, and gave a comparison between other recognition methods, such as convolutional neural networks...
This paper considers how selection techniques applied in an orthogonal frequency division multiplexing (OFDM)-based wireless local area network (WLAN) system influence on a system performance. Namely, ergodic and outage capacity of the considered system are simulated in order to determine the most adequate receiver design for certain WLAN environment.
Large computational load is one of the key issues of an electrical power system security analysis. Currently, most of the researchers are trying to find out how to reduce the computational load. The contingency analysis is one of the most promising approaches for solving the problem. In fact, there are several ways to improve the effectiveness of the contingency analysis. The first way is to reduce...
In this paper, a finite control set-model predictive control (FCS-MPC) scheme with on-line parameter estimation for permanent magnet synchronous generators (PMSGs) based variable-speed wind turbines is proposed. For designing the proposed FCS-MPC, the discrete time model of the PMSG is considered and the future behavior is predicted. Afterward, the switching action that produces the minimum value...
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