Secondary Arc Suppression Based On Equalized Parallel Capacitor Measures And Reclosing Technology Research

UHV transmission line operating voltage level is high,long transmission distance,transmission capacity,the potential for the arc problem is particularly prominent.If the secondary arc can not be extinguished in time,the circuit breaker will be overlapped with the arc ground fault,causing the system to be impacted and deteriorating the operating environment of the power equipment.Adaptive reclosing technology can improve system stability and reliability.It is of great practical significance to carry out innovative research on the new secondary arc suppression measures and the corresponding adaptive reclosing scheme.Firstly,the establishment of accurate and practical dynamic arc model,for the study of potential arc suppression measures and adaptive reclosing technology has important practical significance.The principle and method of constructing the mathematical model of instantaneous fault arc are described.The fault simulation model of ATP-EMTP electromagnetic transient simulation software is used to analyze the resistance,current and voltage characteristics of primary arc and secondary arc.The results show that Method can effectively simulate the dynamic characteristics of the arc.Secondly,the working principle and typical topology of double fracture circuit breaker are described,and the running timing of the parallel capacitor is discussed.According to the fault running state of the UHV transmission line,the equivalent circuit analysis model is deduced,and the parallel capacitance is analyzed qualitatively.Current supply and recovery voltage steady-state components,transient components and neutral point of the small reactor voltage across the impact.The results of the simulation analysis verify the correctness of the theoretical analysis.The parallel capacitance has little effect on the steady-state characteristic and has a great influence on the recovery rate of the recovery voltage.Thirdly,a new secondary arc suppression scheme based on the parallel capacitor of double-break circuit breaker is proposed.The optimal parallel compensation capacitor is obtained by theoretical derivation.The different operating states,system Parameters on the suppression effect,the topology is simple,suitable for long distance,short distance transmission lines.In this paper,a new type of adaptive reclosing scheme is needed to study the fault identification criterion such as voltage amplitude criterion and line head current distortion criterion.Finally,an adaptive reclosing algorithm based on variable modal decomposition energy entropy is proposed to analyze the characteristics of the fault phase voltage signal of transient fault and permanent fault.The scheme uses the modal decomposition signal to obtain the BIMF component,Entropy to calculate the complexity of BIMF components,according to the difference in signal complexity to identify the nature of the fault,the modal decomposition of the characteristics of the analysis,and its empirical mode decomposition compared to prove its decomposition performance,anti-noise ability Strong features.Qualitative analysis of different fault properties,different fault location and different transition resistance on the variable mode decomposition energy entropy fault recognition scheme.Finally,the entropy of the modal decomposition energy entropy and the local mean decomposition are compared and analyzed.The results show that the method is faster and more accurate.