The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The self-starting of induction motors in electric networks auxiliaries of electric stations under different types of short-circuits was researched using the methods of mathematical experiments and digital models.
In the paper the problem of improving of electric power systems analysis using macromodels of their elements formed as state space equations using "black box" approach and expert analysis is considered. The process of the macromodel creation was illustrated on the example of transmission line. The problem of further adaptation of macromodels of electric power system elements to modern software...
This paper presents a method of modelling a vacuum circuit breaker and surge protection in the Matlab package. The simulations were carried out in the capacity circuit with varistor surge protection.
The paper presents an investigation of field oriented control strategy of Permanent Magnet Synchronous Motor (PMSM) based on hardware in the loop simulation (HIL) over a wide speed range. A sensorless rotor position estimation using sliding mode observer for permanent magnet synchronous motor is illustrated considering the effects of magnetic saturation between the d and q axes. The cross saturation...
The increased voltage profile due to excess of reactive power in low load operation mode in power grid is observed. Because of HV overhead lines are distant from power generating sources and variable load curve, the voltage profile could grow over nominal level and at the same time power loss would increase. The last is caused by changed reactive power distribution at the system. Commutation process...
The continuation power flow method is widely used to estimate the maximum loadability of the power system as well as to study the power system voltage stability. This method performance including the convergence level and the computation time and burden is noticeably dependent on the step size control. Thus, an optimum step size control should be chosen for each specific application. To enhance the...
As the power quality problem getting prominent in distribution networks with small hydropower injected, which existing reactive power compensation capacitors are difficult to solve, DSTATCOM is adopted to suppress the over voltage and the fluctuation caused by hydropower in this paper. Based on MATLAB/Simulink, a model of distribution networks with small hydropower injected and a control model of...
Chaos is spread in several areas related to electrical engineering from load forecasting, power electronic system, power system, voltage collapse to catastrophic blackouts. Simulations with few simple circuit based experiments are reported in literature by several authors. Nevertheless it needs a broad study before one tries to analyze its impact and seriousness on existing complexity of system. Chaos...
This paper proposes the application of the continuous Tellegen's power flow to the voltage stability problem. The continuation power flow method remains well-condition around the critical point and is basically consists in assessing voltage collapse point. This method is based on conventional load flow equations and classical Newton-Raphson's method and suffers from improper choosing of step size...
The Unified Power Flow Controller is the most advanced device of FACTS family. It is able to control active and reactive power and voltage magnitude simultaneously. A control range of these system parameters is dependent on UPFC's inverter constraints and also on operating conditions of the power system. In this paper, the results of investigations of influence of UPFC constraints and operating conditions...
This paper figures out the analytical expression of the travelling wave caused by the fault on a transmission line. With the help of the expression, how the different fault situations (including fault type, fault position, fault transition resistance, fault voltage phase angle, bus structure, etc.) can influence the performance of the travelling wave fault locators is discussed. In the paper, a simulation...
Load emulation is the technique by which, different types of load characteristics can be realized without using the actual load modules. This is very useful for testing of power supply equipment under various load conditions. Further the technique of load emulation can be applied for micro grid design and power flow studies under various load conditions. A battery charger based regenerative load emulation...
This paper presents the application of an adaptive neuro-fuzzy controller (ANFC) for speed control of the switched reluctance generator (SRG). In this study, the SRG is driven by a variable-speed wind turbine and connected to the grid through an asymmetric half bridge inverter, DC-link, and DC-AC inverter system. Speed control plays an important role in variable-speed operation of the SRG to ensure...
In this paper, a Genetic Algorithm (GA) optimization technique proposed to find optimal sizing and location of multi distributed generations in electrical networks. The objective function based on a linearised model to calculate the real power losses as a function of power generators. This method based fundamentally on a strong coupling between active power and power flow both as function voltage...
Nowadays fast increase of nonlinear elements number in the power system is observed. Besides of nonlinear loads there are also new energy sources that require electronic and power electronic equipment. These elements cause distortion of electrical signals and presence of higher harmonics in currents and voltages. Algorithms of protection criterion values are matched to fundamental components of currents...
This paper reviews an implementation of hydraulic turbine model as a part of complex collaborative work on electrodynamic model of power system (EDMPS) modernization using modern control and measurement systems. This paper represents a survey that does not reinvent mathematical base, developed enough in large number of works, moreover it gives a description of the hardware model implementation and...
In this paper, the analysis and simulation of a single-core asymmetrical phase shifting transformer (PST) is presented. PSTs are usually used for varying the voltage phase angle between the two systems, which provides controlling active power flow through transmission (tie) line. The essential part of this work was related to developing an appropriate simulation model of the single-core phase shifting...
The paper contains selected results of research related to neural modeling of electrical power system development (EPS or EP System). Numerical data presented in paper [1, 8] were used to teach the artificial neural network (ANN) a model of EP system development. The ANN was designed in the MATLAB and Simulink environment using the Neural Network Toolbox. The generated model was used to perform simulation...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.