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Charakterystyka i zastosowania urządzeń typu PMU w systemie elektroenergetycznym

Bałuka G., Kiernicki J., Stawski P.

Energetyka

2014

nr 12

761--766

Przedstawiono krótko zasady funkcjonowania systemów opartych na urządzeniach klasy PMU, ich charakterystyki i pola zastosowań, takie jak: monitorowanie pracy systemu, oceny stabilności pracy systemu, oceny jakości energii elektrycznej, a także w układach zabezpieczeń. Podano także ocenę jakości samych urządzeń typu PMU.

Presented are shortly operation principles of control systems based on the PMU class devices, their characteristics and field of applications like monitoring of a power system work, system stability evaluation, evaluation of electric energy quality and the work in power system protection schemes. Given is also a short assessment of the PMU devices quality.

Lifting based compression algorithm for power system signals

Duda K.

Metrology and Measurement Systems

2008

Vol. 15, nr 1

69-83

The paper concerns the problem of power system signals compression with possible application in system monitoring and control. The proposed compression algorithm for power system signals ensures efficient use of available storage memory or communication channel bandwidth. It is shown that while preserving good quality, compression ratios from 20 in case of highly distorted waveforms to 340 for slightly distorted sinusoidal waves can be achieved. The presented results were evaluated with a specially prepared representative database of field-recorded electric signals. For signal decorrelation lifting implementation of wavelet transform in the compression algorithm was used. The influence of sampling frequency, length of data frame, type of wavelet function, number of wavelet decomposition stages and quantization level on the compression ratio and compression quality was investigated.