Calculation method for synthetic electric field of ultrahigh voltage direct-current transmission line crossing complex terrain

Abstract

The invention provides a calculation method for a synthetic electric field of an ultrahigh voltage direct-current transmission line crossing a complex terrain. The calculation method comprises the following steps: S1. establishing a synthetic electric field calculation model including a line coordinate parameter and a terrain parameter; S2. randomly setting one point on the surface of a transmission conductor, and determining a power line starting from the point; S3. setting an initial value of electric charge density of the surface of the transmission conductor, and determining the electric charge density and a scalar function of space points starting from the surface of the transmission conductor and along with the power line; and S4. calculating the synthetic electric field according to the determined electric charge density and the scalar function. Based on a Deutecsh assumption principle, rugged topography factors in the calculation process can be introduced by combining an electric charge simulation method, the calculation accuracy of the synthetic electric field can be greatly improved, so that the evaluation accuracy on an electromagnetic environment of the high-pressure direct current transmission line can be improved, and the situations that the calculation difficulty is improved and the calculation amount is increased when the terrain factor is introduced in a traditional algorithm can be also prevented.

Description

technical field [0001] The invention relates to a calculation method for a synthetic electric field, in particular to a calculation method for a synthetic electric field when an UHV direct current transmission line crosses complex terrain. Background technique [0002] In order to realize the optimal allocation of resources, UHV DC transmission technology, which has obvious advantages in long-distance, large-capacity transmission and power system networking, has been rapidly developed, and the electromagnetic environment problems brought by UHV DC transmission lines have been aroused by people. attention, especially the synthetic electric field, one of the important parameters to characterize the electromagnetic environment of UHVDC transmission lines. [0003] At present, the calculation of the synthetic electric field of HVDC transmission lines mainly adopts the empirical formula method, the numerical calculation method of Deutsch assumption and other numerical calculation...

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Problems solved by technology

[0003] At present, the calculation of the synthetic electric field of HVDC transmission lines mainly adopts the empirical formula method, the numerical calculation method of Deutsch assumption and other numerical calculation methods, but in the above calculations, it is assumed that the ground in the area passed by the HVDC transmission line is flat, and the ground The situation is single, ignoring the influence of terrain fluctuations on the synthetic electric field, but the ground conditions in the area where the actual transmission line passes are complex, that is, the ground is always undulating

According to the actual measurement on site and the comparison of the theoretical value calculated by the traditional algorithm, the undulating ground has a great influence on the synthetic electric field of the HVDC transmission line, which means that there is a large deviation between the synthetic electric field obtained in the traditional algorithm and the actual measurement , indicating that the traditional algorithm ignores the ground and has a serious impact on the accuracy of the calculation of the synthetic electric field, thereby affecting the accuracy of the electromagnetic environment assessment. However, in the traditional algorithm, if the terrain factor is taken into account, the calculation difficulty and amount of calculation will be greatly increased. And cause the accuracy of calculation results to be seriously affected

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