Utilization of the voltage rate to localization of harmonic sources in a power system
The paper proposes the new approach to determine which side, the utility or the customer is dominant harmonic source in a power system. At the beginning, review of existing approaches to localization of harmonic sources is given. Then, the theoretical background of the new approach is presented. The used criterion of localization of harmonic sources in a power system is based on examining the voltage ratio, which is defined in the paper. The results of investigation of sensibility of this ratio to the errors burdening quantities used for its calculation are analyzed. The practical conclusions are given. It is underlined that the presented approach has better properties than existing ones.
Single-point measurement localization of prevailing harmonic sources in a power system
The paper deals with higher harmonics in a power system. The aim of the paper is to present a review of ideas of single-point measurement localization of prevailing harmonic sources in a power system. Knowledge about the location of the harmonic sources in a power system is useful to control harmonic levels at a power system. These knowledge is also useful to solve disputes between utilities and customers. In the paper, ideas of localization of prevailing harmonic sources in a power system based on analysis of components of the voltage or current as well as based on analysis of the power flows at the point of common coupling are described. For each of the mentioned ideas, theoretical background, notes on practical realizations and discussion of features are presented.
Frequency selective surface design for blinds applications
In this paper, the reconfigurable blind structure with frequency selective surfaces(FSS) for the building applications are presented. Frequency transmission characteristics for different angles of the proposed blind-FSSs are investigated and verified through simulation and measurement. The simulation results show that we can implement the reconfigurable blind-FSS for multiband wireless applications. To verify the proposed paper, two kinds of blind-FSSs, crossed dipole FSS and circular ring FSS are fabricated and measurements are performed for different angles. The proposed structure in this paper which is very simple, can be easily applied to any planar surface for wireless security applications at low cost.