The Ferromagnetic Resonance Probability Analysis Of Series Compensation Lines In Distribution Network

Adding series compensation to the distribution line can effectively increase the line end voltage and reduce the line loss.However,in the loop,the core inductors will have different inductance due to different magnetic saturation levels.When the series compensation device is put into operation or shock disturbance occurs,the ferromagnetic resonance of the line may be induced.The long duration of the ferromagnetic resonance phenomenon has a wide range of impact and poses a great threat to the safe operation of the distribution network.How to accurately evaluate the risk of ferromagnetic resonance in the series compensation circuit to prevent the occurrence of the ferromagnetic resonance,and to ensure the safe and stable operation of the line wihile improving the power quality has become a key issue of the series compensation circuit.This paper studies the problem of ferromagnetic resonance induced by series compensation of distribution lines.Firstly,the application principles and advantages of series compensation technology in distribution network are described.The generation mechanism and characteristics of ferromagnetic resonance are analyzed.A simple series compensation circuit is used to perform the ferromagnetic resonance simulation.The study finds that the compensation method and the range of series compensation adopted by the series compensation circuit have an important influence on the occurrence of the ferromagnetic resonance.Then,combined with the actual operation of the power grid,a detailed analysis of the various causes and influencing factors of the induced ferromagnetic resonance is given.Line parameters,types of faults,and protection measures are analyzed,and a weight model of state variables is constructed.Based on this,a probabilistic analysis model for the occurrence of ferromagnetic resonance in series compensation lines is established,and the probability of occurrence of ferromagnetic resonance in series compensation lines is calculated.Corresponding ferromagnetic resonance prevention measures were proposed.Finally,taking a certain line as an example,the probability of occurrence of ferromagnetic resonance on the line is calculated.The results verify the feasibility and accuracy of this method,and have applicability in practical engineering applications.