Topology identification method of low-voltage distribution network based on measurement data of IoT devices

Wu, Shutan; Han, Jianda; Wang, Qi

doi:10.1016/j.egyr.2023.04.114

Cited by 2 publications

(1 citation statement)

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“…With the development of smart grid technology, the characteristics of the distribution network are becoming more and more complex, and the real-time online monitoring of the operating state of the distribution network has been suggested, which has higher requirements. Real-time and accurate distributed measurement provides a new idea for the monitoring of the distribution network [ 1 , 2 , 3 , 4 ]. There are many current measuring devices for power systems, such as magnetic components [ 5 , 6 ], Hall sensors [ 7 ], Process Control Blocks (PCBs) and Roche coils [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Transmission Line Voltage Measurement Utilizing a Calibrated Suspension Grounding Voltage Sensor

Huang,

Zhang,

Zhu

et al. 2023

Sensors

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The accurate voltage measurement of distribution networks is of great significance in power dispatching and fault diagnosis. Voltage sensors based on the spatial electric field effect do not require grounding, which provides the possibility for the distributed measurement of transmission line voltages. However, the divider ratio of suspension grounding voltage sensors is affected by the height between the sensor and the ground, as well as the distance between the sensor and the telegraph pole. In this paper, a self-calibration method based on internal capacitance transformation is proposed to realize the on-line calibration of suspension grounding voltage sensors. The calibration is accomplished by switching different parameters in the conditioning circuit, and the calibration process does not require power failure or known input excitation. In addition, the impact of electric fields in the other two phases of three-phase transmission lines on measurement through simulation research is quantified in this paper. In order to reduce the impact of interference electric fields, an equipotential shielding structure is designed. The circuit topology and probe prototype have been developed and testing has been conducted in laboratory conditions; the experimental results show that the maximum relative error of voltage amplitude is 1.65%, and the phase relative error is 0.94%. The measurement accuracy is not limited by the height to ground or the distance to the telegraph pole. In addition, in the application of an equipotential shielding probe, the maximum deviation of measured voltage is 0.7% with and without interference electric fields.

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