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Overview on topology identification technologies for a low-voltage distribution network

Haotian Ge, Jiuming Zhong

Archives of Electrical Engineering

2023

Vol. 72, nr 4

1017--1034

The topology identification of low-voltage distribution networks is an important foundation for the intelligence of low-voltage distribution networks. Its accuracy fundamentally determines the effectiveness of functions such as power system state estimation, operational control, optimization planning, and intelligent electricity consumption. The low-voltage distribution network is composed of transformers, lines, and end users. The key task of topology identification is to distinguish the connection relationship between distribution transformers, low-voltage lines, and phase sequence with end users, which can be divided into transformer user relationship, line user relationship, and phase user relationship. At present, the main methods of low-voltage network topology identification can be divided into signal injection method and data analysis method. The signal injection method requires a large number of additional terminal devices and is difficult to promote. The data analysis method combines the characteristics of switch state, voltage, current, electrical energy, and other data to perform topology analysis. The commonly used methods include correlation analysis and feature learning. Finally, typical problems that urgently need to be solved in topology recognition and representation were proposed, providing a reference for the research and development of low-voltage distribution network topology automatic recognition technology.

Initial mover position estimation of permanent magnet linear synchronous motor with signal injection method

Wang L., Lu Q., Ye Y.

Przegląd Elektrotechniczny

2012

R. 88, nr 10a

256-268

This paper proposes a useful method to estimate the initial mover position of a surface-mounted permanent magnet linear synchronous motor (SPMLSM). The estimation is performed by saliency effect and nonlinear magnetization characteristics of stator core. Two available methods of pulse voltage injection and high-frequency injection are analyzed in detail, and then a relatively simple approach in signal processing is proposed. By the measurement of a SPMLSM prototype, the high-frequency injection method is proved more accurate and reliable than pulse-voltage injection method in estimation of the initial mover position.

W artykule zaproponowano metodę określania położenia element ruchomego liniowego silnika synchronicznego z magnesami stałymi SPMLSM. W obliczeniach wykorzystano nieliniową charakterystykę namagnesowania rdzenia stojana. Analizowano dwie metody wstrzykiwania napięcia impulsowego i wysokoczęstotliwościowego. (Określanie początkowej pozycji elementu ruchomego w silniku liniowym synchronicznym metodą wstrzykiwania sygnału)