Modeling method based on space magnetic field with transmission line on one tower

Abstract

The invention belongs to the filed of the power system and automation thereof, and particularly relates to a modeling method based on a space magnetic field with transmission lines on one tower. Based on the self-inductance of each phase line and the mutual inductance between the phase lines of actual double-circuit transmission lines on one tower and in accordance with the principle of space magnetic field coupling, a model is constructed with an iron core coil structure. The self-inductance of each phase line and the mutual inductance between the phase lines can be accurately and flexibly adjusted through adjusting the turn number of the self-inductance main coil and the mutual inductance adjusting coil, so that the external properties of the phase lines (positive, negative and zero sequence impedance) are consistent with the external properties of actual lines. Simultaneously, local features of the actual lines can be simulated. The model constructed in the method can comprehensively and actually reflect the self-inductance of each line and the mutual inductance between lines, and solve the problem that the conventional model can only reflect the zero-sequence mutual inductanceof two lines and has serious errors in simulation of asymmetric lines without actual transposition.

Description

technical field [0001] The invention belongs to the field of electric power system and automation thereof, and in particular relates to a modeling method of parallel transmission lines on the same pole based on a space magnetic field. Background technique [0002] In recent years, with the rapid development of my country's national economy, the demand for electricity is increasing day by day, and the requirements for power grid transmission capacity are also increasing day by day. Double-circuit transmission lines paralleled on the same pole are widely used in my country because of their narrow transmission corridors, large transmission capacity, high power supply reliability, and simple operation and maintenance. Pay attention to. In order to correctly simulate the parallel double-circuit line on the same pole, make it reflect the physical characteristics of the actual line as much as possible, and provide a research platform for the development of related relay protection ...

AI Technical Summary

Problems solved by technology

Literature [1] (see Wu Guoyu. Power System Simulation [M]. Beijing: Water Resources and Electric Power Press, 1987), mentioned a physical simulation model of double-circuit lines on the same pole based on "hexagonal" reactors, and its manufacturing It is difficult to debug and debug, and in order to ensure the balance of parameters, the related six air gaps need to be adjusted synchronously, which makes the parameter adjustment extremely complicated. Differences Existing in Mutual Inductance of Lines When Symmetrical

Literature [2] (see Gan Liangjie. Simulation of double-circuit lines on the same pole in the power system dynamic simulation device. Journal of Electric Power Systems and Automation, 1991, 3(2), 60-65), literature [3] (see Guo Yuzao, Lin Shenghong, Liang Yanzhen, etc. Dynamic physical simulation of high-voltage transmission lines [J]. Journal of South China University of Technology, 1996, 24(1): 145-150) proposed a double-circuit line model on the same pole based on three mutual inductance reactors, The resistance in the positive and negative sequence impedance of the line model is equal to the resistance in the zero-sequence impedance, but in the actual line, the two are not equal; in addition, the model only considers the zero-sequence mutual inductance between the two loops influence, which cannot reflect the difference in mutual inductance among the lines of double-circuit lines paralleled on the same pole

Literature [4] (see Fu Yuying, Yan Gangui, Dai Wuchang, et al. Dynamic physical model of 500kV double-circuit lines paralleled on the same pole, Jilin Electric Power, 2006, 34(2), 11-13) discusses the zero-sequence current mutual inductance The same pole double-circuit line model of the secondary access impedance of the transformer, this model also only considers the effect of the zero-sequence component of the mutual inductance, does not consider the influence of the actual position of the transmission wire, and cannot simulate the coupling relationship between the positive and negative sequences between the two circuits

Images