Sugoog Shon

A study on the implementation of inductive coupler with rogowski coil for BPLC

In this paper, using a rogowski coil with a non-saturation characteristic to high current, a novel broadband inductive coupler for broadband power line communication (BPLC) has been first proposed and implemented. The frequency behavior of the rogowski coil has been analyzed in order to obtain a broadband frequency response for BPLC. Based on analyzed results, a non-saturated inductive coupler with broadband frequency response has been implemented. The variation of insertion loss of the implemented inductive coupler with the rogowski coil and the conventional inductive coupler with magnetic material according to magnitude of current has been measured, and then the performance of the implemented inductive coupler is verified to compare the measured results.

Exact determinants and inverses of generalized Lucas skew circulant type matrices

In this paper, we consider generalized Lucas skew circulant type matrices, including the skew circulant and skew left circulant. Firstly, we discuss the invertibility of generalized Lucas skew circulant matrix and present the determinant and the inverse matrix by constructing the transformation matrices. Furthermore, the invertibility of generalized Lucas skew left circulant matrix is also discussed. The determinant and the inverse matrix of generalized Lucas skew left circulant matrix are obtained respectively.

A field trial of medium voltage power line communication system for AMR and DAS

In this paper, a test field of high-data rate PLC using overhead medium voltage power line (MV BPLC) for applications to automatic meter reading (AMR) and distribution automation system (DAS) is introduced. It was established in Jeju island, Korea and 8.2 km long. For the MV BPLC, a MV coupler for BPLC with internal impedance matching transformer was developed. For repeating, techniques of both time division (TD) and frequency division (FD) were properly used. There were strong impulsive noises caused by lightning arresters. The impulsive noise degrades severely performance of MV BPLC because the impulsive noise gives direct influence on data signal. To solve the problem of the impulsive noise, the lightning arresters that are noise sources were found using inductive coupler for medium voltage and replaced with new ones. Finally, we found that the system has more than 2Mbps TCP data rate and can be used as a communication network for AMR and DAS.

Coupler with transformer for impedance matching on mv power distribution line for BPLC

In this paper, the couplers with transformers for the purpose of impedance matching at signal input terminal of Medium Voltage(MV) power distribution lines for Broadband Power Line Communication(BPLC) which used in the frequency range of 1 MHz to 35 MHz have been designed, and the performance of those has been verified experimentally. In fact, the input impedance values of MV power distribution lines have been obtained between 200Omega and 300Omega[6]. In the range of these values, we have designed the transformers with general specific values of impedance: 50Omega, 112Omega, 253Omega, 356Omega, and 450Omega by utilizing the Ruthroffs transmission line transformer method[7]. The most proper transformer, matching well is embedded in a coupler and is implemented to transfer a transmitting signal with maximum power into the MV distribution lines. The performance of the designed coupler with a transformer is verified through measuring the reflection characteristics and signal attenuation in given MV test field. The measured results have informed that the couplers with transformers with impedance values of 253Omega or 356Omega have represented the best performance of them.

Characteristic Parameter Analysis on Medium Voltage Power Distribution Line for BPLC

Characteristic parameters for 22.9 kV medium voltage (MV) over-head power distribution lines are studied to broadband power line communication (BPLC) high data rate service that allocated frequency range of 2 MHz to 40 MHz. Characteristic impedance of MV power line is obtained between 470Omega and 530Omega. It depends on the cable cross-section area. Also it should be noted that when frequency is lower than 20 MHz, the characteristic impedance of MV power line, with the effect of ground conductivity, becomes slightly higher than when it is assumed the ground is perfect conductor.

Development of real-time simulator theory and modeling technique based on NS-2

By using information technology, smart grid saves energy, reduces cost and improves reliability. By delivering the information of power production and consumption to a bidirectional on a real time, energy efficiency is optimized. However, the operating method of the distribution system needs to be changed by increase of capacity of Distributed Energy Resource (DER) and new load (e.g., PHEV, fuel cell). Thus, every country, the lively study about smart grid in the national dimension is in progress. However, actual research did not progress nearly that can be applied to real system. This paper propose real time simulation theory and modeling skill for utilizing the smart grid in the IP network. By using Network Simulator version2 (NS-2), a grid was designed and a simulation was performed. And, we examined possibility of applying at the IP network.

Determinant of the Generalized Lucas RSFMLR Circulant Matrices in Communication

In this paper, the explicit determinants are presented by using generalized Lucas numbers. The techniques used herein are based on the inverse factorization of polynomial. Firstly, we introduce the definitions of the RSFMLR and RSLMFL circulant matrices in communication, and properties of the related generalized Lucas numbers. Then, we present the main results and the detailed process.

Neutral inductive coupling for improved underground medium voltage BPLC

In the underground MV BPLC systems, the inductive coupler has been mainly used being clamped around the MV power cable. But the high current on the MV power line causes the magnetic saturation of the inductive coupler, so the quality of coupling could be gone down. To solve this problem, we suggest that the neutral line of the underground MV power line can be used for the coupling as a communication medium, and we have newly developed a inductive coupler with loss less than 5dB for the underground MV neutral line and experimentally assessed it. For the purpose of evaluating the coupler, we had constructed the underground MV BPLC test bed that has the 9 repeating points with the 200Mbps class BPLC repeaters. The length of the test bed is about 836 m. It is located in Ansan-city, Korea. We have measured the transmitted signal attenuation and TCP data rate as the factors of the performance evaluation where the TCP data rate means the data rate over TCP layer. The results measured about the existing inductive coupler and the new one have been compared, and the results measured according to the inductive coupling methods included the neutral line coupling method have also compared. As a result, the suggested coupling method and the newly developed inductive coupler have not only the good performance, but also the cost effectiveness because of the fact that there is no magnetic saturation problem and its small size. Therefore, when we consider the cost effective communication infrastructure for Smart Grid, we can say that the underground MV BPLC system is still attractive.

Analysis of impedance characteristics of MV power distribution line for BPLC

In this paper, an impedance characteristics of a Medium Voltage(MV) power distribution line in the frequency range of 1 MHz to 40 MHz for Broadband Power Line Communication (BPLC) has been analyzed and verified experimentally. In order to analyze the impedance characteristics of MV BPLC system, the 2-port equivalent model has been used. Especially, the input impedance values of MV power distribution lines have been obtained between 200 Omega and 300 Omega, which are about a half of the characteristic impedance values of MV power distribution lines. Then the analyzed input impedance has been verified by measuring reflection coefficients at the signal input terminal of a MV power distribution line through the vector network analyzer in the given MV test field. From the experiment, the measured results are very similar to the analyzed results.

Inversion of two new circulant matrices over Zm

In this paper we consider the problem of inverting an n×n RSFMLR circulant matrix with entries over Zm . We present two different algorithms. Our algorithms require different degrees of knowledge of m and n, and their costs range, from n log n loglog n to n log2 n loglog n log m operations over Zm . Moreover, for each algorithm we give the cost in terms of bit operations. Finally, the extended algorithms is used to solve the problem of inverting RSFMLR circulant matrices over Zm .