Mohamed Mamdouh Abdel Aziz

Optimal

In its broadest sense, passive filters have been a very potent technique for power system harmonic suppression because of their possible different frequency response characteristics that can achieve a certain required harmonic filtering target, also due to their simplicity and economical cost. This paper presents an application of FORTRAN feasible sequential quadratic programming to find the optimal sizing of parameters of C-type passive filters for minimizing the total voltage harmonic distortion of nonlinear loads, where maintaining a given power factor at a specified range is desired. The optimal design of the C-type passive filter as an alternative to the conventional passive filtering techniques is introduced, and a detailed comparison of the results between an uncompensated system and a C-type filter are discussed by means of different numerical examples, considering source and load nonlinearities, while taking into account compliance with the IEEE standards 519-1992 and 18-2002.

C

A method is presented for finding the optimum fixed LC compensator for power factor correction of nonlinear loads where both source voltage and load current harmonics are present. The LC combination is selected because pure capacitive capacitors alone would not sufficiently correct the power factor. Optimization minimizes the transmission loss, maximizes the power factor, and maximizes the efficiency. The performance of the obtained compensator is discussed by means of numerical examples.

-Type Passive Filter Based on Minimization of the Voltage Harmonic Distortion for Nonlinear Loads

This paper describes an optimization method for the evaluation of the parameters of the LC compensator for nonlinear loads taking into account cost constraints. The solution will be obtained with an optimization algorithm based on the reduced gradient technique which will locate the maximum power factors by searching along the constant-cost power factor ridges, for the point where the gradient of the transmission loss is zero.

LC compensators for power factor correction of nonlinear loads

A method is presented for finding the optimum fixed LC compensator for power factor correction of nonlinear loads where both source voltage and load current harmonics are present. The LC combination is selected because pure capacitive capacitors alone would not sufficiently correct the power factor. Optimization minimizes the transmission loss, maximizes the power factor and maximizes the efficiency. The performance of the obtained compensator is discussed by means of numerical example.

LC compensators based on cost minimization for nonlinear loads

In this paper, the finite-element method is used to perform heat transfer analysis to obtain the steady state and the transient temperature distribution of gas cooled-insulated power transformers. All significant parameters that influence transformer operation have been included. Also, the analysis results, which are obtained from the thermal analysis, could be reviewed at any specified location within the transformer as a function of time. The predicted temperature values are compared with experimental results reported in the literature.

Comparing capacitive and LC compensators for power factor correction

This paper presents an adaptive fault location scheme for aged power cable using synchronized phasor measurements from both end of the cable line. The proposed fault location scheme is derived using the two-terminal synchronized measurements incorporated with distributed line model, modal transformation theory and discrete Fourier transform. The proposed scheme has the ability to solve the problem of cable changing parameters especially the change of the relative permittivity over its age and thus for the operating positive, negative, and zero-sequence capacitance changes. Extensive simulation studies are carried out using alternative transients program ATP/EMTP. The simulation studies show that the proposed scheme provides a high accuracy in fault location calculations under various system and fault conditions. The results show that the proposed method responds very well insensitive to fault type, fault resistance, fault inception angle and system configuration. The proposed scheme solves the problem of aged cables with change of its electric parameters. In addition to, it gives an accurate estimation of the fault resistance.

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The choice of LC compensator may be constrained by the availability of manufactures units. To account for this, the capacitor values are chosen from among standard values and for each value the transmission losses is minimized, or power factor is maximized, or transmission efficiency is maximized. The global minimum or maximum is obtained by scanning all local minims or maxims. The performance of the obtained compensator is discussed by means of numerical example.

{\rm SF}_{6}

Renewable energy resources, such as wind turbines (WT) and photovoltaic cells (PV), can serve as an alternative to fossil fuel-generated electricity. They are being considered as the most promising new energy sources due to their availability and topological advantages in local power generation, but they have a drawback in that electrical output energy is unstable besides the initial and maintenance costs are expensive. This paper presents a novel technique to extract the optimum sizing of hybrid renewable energy generation system (HRES) with storage system via open space particle swarm optimization (OSPSO). The simulation using this technique is shown. The total system cost is the objective function. The technical sizing is a constraint.

Gas Cooled-Insulated Power Transformers Solved by the Finite-Element Method

The use of terminal shunt capacitance has different effects on the displacement factor and distortion factor components of the power factor. These effects are considered for nonlinear loads with ideal supply, and also where the supply impedance exists but is small compared with the load impedance. Optimization of the displacement factor is found to result in reduction of the distortion factor to a minimum value.

An PMU double ended fault location scheme for aged power cables

A method of applying power-factor (PF) correction capacitors is discussed based on net savings maximization according to Egyptians Tariff. Test results from examples taken from existing publications are presented. The purpose of this application technique is to utilize existing electrical distribution equipment in the installation of very large values of PF correction capacitors. It is concluded that LC compensators can be installed, thus providing maximum benefits from penalty elimination, system losses reduction, release of system transformer capacity, and minimum switching transients. Paybacks of less than one year can be expected.