Voltage Sag Evaluation Method and Control Strategy for Transmission and Distribution Integration

The urban power grid is integrated operation of transmission and distribution with close electrical coupling. Considering the interaction between the distributed generation and load characteristics of the distribution network and the disturbance of the transmission network, the accurate evaluation o...

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Bibliographic Details
Published in2022 4th International Conference on Smart Power & Internet Energy Systems (SPIES) pp. 26 - 31
Main Authors Yang, Junjun, Zha, Xianyu, Tu, Wang, Zhang, Yinbao, Sun, Helin, Zou, Delong, Fu, Xuanyi
Format Conference Proceeding
LanguageEnglish
Published IEEE 09.12.2022
Subjects
Analytical models
control strategy
Couplings
Distribution networks
Electromagnetic modeling
integration of transmission and distribution
online equivalent modeling
Power quality
Power system dynamics
Simulation
urban power grid
voltage sag
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Summary:The urban power grid is integrated operation of transmission and distribution with close electrical coupling. Considering the interaction between the distributed generation and load characteristics of the distribution network and the disturbance of the transmission network, the accurate evaluation of the voltage sag index based on the full electromagnetic model is of great significance for the safe operation of the power grid and the reliable power supply. In this paper, an online dynamic equivalence method based on the full voltage level of the transmission and distribution network model is proposed, which not only ensures that the key dynamic modes of the system are not lost, but also greatly reduces the scale of the network involved in the calculation. An online assessment and control strategy optimization method of voltage sag that integrates physical mechanism and electromagnetic transient simulation technology is proposed. This method can quickly and accurately give the evaluation index to characterize the voltage sag, in order to screen the area of vulnerability effectively and formulate the control strategy. It provides a basis and improves the real-time and pertinence of power grid voltage sag analysis and control. Through the simulation analysis of an online example of a large urban power grid, the effectiveness and practicability of the proposed method are verified.
DOI:10.1109/SPIES55999.2022.10082384