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This paper studies the performance of the three phase induction motor with different methods of braking, such as forward plugging, ac dynamic braking and reverse plugging braking using direct torque control (DTC). The simulation results are validated with the practical results under different conditions. The paper presents a solution to decrease the energy losses resulting from traditional methods...
The paper is concerned with power system automatic generation control (AGC) in dynamic and steady state conditions. In this paper, we employ classical designs that require the use of all state variables to form a linear static controller. The other approach to the design of regulators is the optimal control theory.
A Boundary Element Approach is used to get the numerical computation of grounding system analysis such as the equivalent resistance and the distribution of potential on the earth surface due to fault currents. The results in this paper are produced by the techniques that have been implemented in a computer aided design (CAD) system for grounding grids of electrical substations. The paper investigates...
This paper presents a reliable, fast and simple system to detect and recover faults in computer networks at control center of power automation system. There is no way to get the information of the remote devices when networked system at control center is failed. The proposed system makes use of the insertion of smart switch (SS) into the ordinary automation system of power utilities to keep the network...
This paper describes the practical estimation of a linear discrete-time state-space model of the high voltage unit in an electrostatic precipitator used in a large cement factory. A computer interface system is developed to facilitate measurements of voltages and currents at both LV and HV sides of the transformer circuit of the HV unit. The unbiased recursive least-squares algorithm is used to identify...
In this paper, the proposed model of fluorescent lamp with electromagnetic ballast was modified to be able to explain and represent the phenomena of the light flicker mechanism in case of integer and non integer harmonics included in the supply voltage waveform. A new extension on the model was implemented to calculate the harmonic current generated by fluorescent lamp. Total harmonic distortion calculations...
The generated power from Photovoltaic Power System, PVPS have been calculated by a computer program under known insolation and temperature. The computer program, which proposed here and applied to make optimal design of PVPS, is based on the minimization of the energy purchase from grid. This paper presents a complete study from economic and reliability point of view to determine the impact of interconnecting...
This paper represents the sizing calculation of photovoltaic (PV) system as electrical power source of radio repeater system. Also it represents the annual environmental effects on PV system performance in different locations in Egypt. The solar radiation and temperature variation for the I-V characteristics, the output power, the maximum power (Pmax), the open circuit voltage(VOC), and the short...
This paper presents the direct torque control (DTC) of an interior permanent magnet synchronous motor (IPMSM) based on sliding mode technique. An adaptive sliding mode controller is designed for controlling the electromagnetic torque. Consequently, the demerits of classical DTC (large torque and current ripples due to sector changes, low speed problems, and sensitvity to uncertainties) could be avoided...
In this paper, the effect of the spacer's dimensions and its relative permittivity on the total electric field distribution on its surface will be presented and discussed. These effects will be also outlined for a practical spacer's shape. The field behavior near the triple junction will be explained. Finally, an approximate empirical equation for the electric field distribution on the spacer's surface,...
In this paper, a novel damping controller with a simple structure, is designed based o the H?? optimal control method for power system stabilizer (PSS) in multimachine area. The parameters of the proportional integral (PI) controller are tuned to mimic the performance of the decentralized one. More specifically, genetic algorithms (GAs) optimization is used to obtain the control parameters of the...
Increased loads and customers demand from the distribution utility side by side with the deregulated environment have focused more light on distributed generation (DG) as an attractive option to defer transmission and distribution upgrading, and to support reliability and system performance. This paper discusses modeling of different types of DG and its integration in the distribution network using...
This paper proposes a novel technique for controlling the voltage magnitude and its phase angle variables of Flexible AC Transmission Systems FACTS device called static phase shifter for automatic generation control. The proportional controllers are designed to modulate simultaneously the static phase shifter variables for enhancing the automatic generation control performance. The tabu search optimization...
This paper describes the details of a Simulink-based dynamic testing of the power differential relay. Power differential relay has been simulated and tested for transmission lines as a MATLAB/SIMULINK model with the use of the Power System Blockset. The developed modeling facilitates testing the dynamic behavior of the power differential relay during fast system transients. Different outputs have...
This paper presents the steady state operation of the axial laminations switched reluctance motor (ALSRM). The performance of the motor is studied under constant speed operation and different values of both the switching turn on and off angles. The response of the motor is obtained at low, high, and very high speed in order to illustrate the performance of the motor. The ALSRM is used for high speed...
The paper presents a comparative study of two different speed observer techniques for a sensorless induction motor drive. Both Model Reference Adaptive System (MRAS) and sliding mode control theories are considered. The speed estimation algorithms based on both techniques are derived and implemented in a simulation program. The robustness of both speed estimation algorithms against load torque changes...
Electrical motors are designed on the basis of balanced three-phase sinusoidal input voltage. Non-sinusoidal voltage, which is the common output voltage from PWM inverters, has detrimental effects on induction motors performance characteristics, and derating of machine is required. In this paper the performance of a three-phase induction motor is intensively investigated when it is fed from PWM inverter...
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