Selection of C-Type Filters for Reactive Power Compensation and Filtration of Higher Harmonics Injected into the Transmission System by Arc Furnaces

Abstract

This article presents a method for selecting the elements of a C-type filter working with a conventional LC-type filter for compensating reactive power and filtering out higher harmonics generated by arc furnaces and ladle furnaces. The study was conducted in a steel mill supplied by a 110 kV transmission system, where higher harmonic currents and nonlinear loads were measured. A series of computer simulations were performed under various operating conditions, and an algorithm for selecting the parameters of a third-order C-type filter (for suppressing the second harmonic) and two second-order LC-type filters (for suppressing the third harmonic) was proposed. The filtering system was tested in an arc furnace with the highest rated power, and harmonics in the current spectrum were evaluated. The results of the measurements were used to analyze the effectiveness of the compensation system comprising two passive C-type and LC-type filters at different system configurations. C-type filters significantly influenced current harmonics. The influence of the changes in the number of arc furnace transformers on the true Root Mean Square (RMS) of the currents injected into the 110 kV transmission system and on the voltages of the 110 kV busbars was discussed.

Using C‐type filter with partial compensation method for capacity reduction of hybrid power quality conditioner in co‐phase traction power system

“…higher than seventh order. The tuning frequency is selected as high as possible considering the load harmonic contents to explore the C-type filter attenuation performance contrary to previous works focused merely on resonance damping effect [19,21]. The C-type filter current is shown in Figure 24b in which the reactive power injection is 78.5 VAR, close to half the required reactive power by the load.…”

High Harmonic Reduction Using Passive Filters of Mountain Steel Company

“…Rest multi-pulse rectification circuits based on parallel connection of6 th -pulse groups. It should be noted that the increase in the quality of consumed electric power by increasing the pulsation of rectification, leads to a significant increase in the price of the product and a decrease in its reliability (Lange and Redlarski, 2020).…”

Investigation on the Work Efficiency of the LC Passive Harmonic Filter Chosen Topologies

“…In [51][52][53][54], it is computed through the filter quality factor. In [55][56][57][58][59][60][61], its computation is more complex taking into account various parameters, such as the grid short-circuit power and impedance, filter losses and efficiency, the damping of resonances, the harmonics amplification, etc. The case studies presenting the consequences of the wrong selection of PHFs damping resistance or tuning frequency are rare in the literature.…”