Power Loss Flow Research Articles

A New DC Model for Transmission Loss Allocations in Power Systems

Under open access environment in the era of deregulated power industry, transmission loss allocation to various transactions is one of the important issues to be solved exactly. Because of the non-linear nature of power flow and power loss, it is very difficult to segregate and to allocate losses among the participants properly. This paper presents a New DC method (NDC) where an efficient loss allocation algorithm has been applied. Considering the impact of every line flow in a network, the loss allocations to the loads have been computed at first and finally the total loss has been allocated to the generators. The effectiveness of this procedure has been studied for the 6-bus and IEEE 118-bus model power systems. Several numerical analyses implicate that the proposed loss allocation procedure including the DC load flow model is reasonably acceptable. 
 
 Keywords: Transmission loss allocation DC load flow model, Deregulated power market 
 
 Bangladesh J. Sci. Ind. Res. 42(3), 257-268, 2007

A Fast Procedure for Transmission Loss Allocation of Power Systems by Using DC-OPF

Deregulation of power industry has made us think over the transmission loss allocation to network users and to various interconnected transactions including bilateral one. It is an important issue to be solved exactly. Because of the non-linear nature of power flow and power loss, it is very difficult to segregate and to allocate losses among the participants properly. This paper presents an instantaneous loss allocation algorithm including DC-Optimal Power Flow. Using Incremental Transmission Loss (ITLs) factors and the power outputs of generators, we have calculated preliminary loss to each generator. Calculating loss allocation rates from the preliminary losses, the final loss allocation has been done (according to loss allocation rate) to meet the total loss calculated by DC-OPF. The effectiveness of this procedure has been studied for a small model power system and also for the IEEE-118-bus system. 
 
 Keywords: Transmission loss allocation, DC optimal power flow, Deregulated power market, Bilateral transactions.
 
 Bangladesh J. Sci. Ind. Res. 42(3), 249-256, 2007

Properties of dielectric-tube waveguides

Two aspects of dielectric-tube waveguide properties are considered. First, a mode designation is given which is consistent with one previously adopted for the dielectric rod, based on the behaviour of field components as well as on the sequence of solutions. Computed 2- and 3-dimensional field configurations are shown for the HE11 and EH11 modes. The second aspect is concerned with the propagation characteristics for all modes. Expressions are derived for power flow, energy storage and power loss using a perturbation method, giving expressions for group velocity and attenuation coefficient. It is indicated that a certain configuration of the dielectric-tube waveguide may be practicable at the higher microwave frequencies

Wave Propagation across an Interface between Solid and Fluid Bounded Media

Stress-wave propagation conditions across a plane interface between a cylindrical solid rod and confined fluid column are determined. This is done by expressing the displacement and stress fields as infinite sums over the eigenvalues found from dispersion relations resulting from the appropriate wave equations and transverse boundary conditions. To obtain numerical results, these sums are truncated and the interface boundary conditions are imposed at enough points along a radius to solve for amplitude coefficients in the truncated series. The number of terms can be increased to satisfy the boundary conditions everywhere to an arbitrary degree of accuracy. For the case of nylon to water, fields are calculated in both media from which intensity, power flow, and transmission loss are determined. New information is obtained about the stress and displacement fields as a function of frequency, axial and radial position. An end resonance similar to that of a free bar is found at which practically no energy couples to the water. [Research supported in part by the Office of Naval Research, The Link Foundation, and Department of Defense's Joint Services Electronics Program.]

Simplified Theory of Microstrip Transmission Systems

Properties of TEM-mode propagation are examined for a wire or a strip of finite width immersed in a uniform infinite dielectric above a ground plane. Characteristic impedance, power flow, and conductor and dielectric losses are considered. The discussion of the TEM mode is in the complex plane.