Novel soil equivalent resistance model modeling method

Abstract

The invention discloses a soil equivalent resistance model modeling method in combination of repeated multipoint actual measured data of a power grid and simulation modeling calculation. The method ischaracterized in that an existing soil equivalent resistance model construction method is improved by use of a mixed modeling method in combination of the actual measured data and the simulation modeling calculation; repeated multipoint measurements are performed on an alternating-current power grid by changing a topological structure of the alternating-current power grid, that is, sequentially switching off any return circuit of alternating current circuits between two transformer substations with direct electrical contact in a modeling range to obtain multiple groups of direct current distribution data of a main transformer neutrality point of each transformer substation in the modeling range; and a soil equivalent resistance model is constructed by simulating calculation and inversionmeans. According to the soil equivalent resistance model modeling method, detailed soil parameters are unnecessary to collect, the calculation accuracy degree is high, the problem that a non-uniform layered soil model is difficult to establish accurately in previous methods is overcome, and the method is suitable for accurate calculation of distribution of direct currents in an alternating currentsystem in the case of complex soil compositions.

Description

technical field [0001] The invention belongs to the field of high-voltage direct current transmission, and in particular relates to a novel soil equivalent resistance model modeling method which combines multiple and multi-point actual measurement data of a power grid with simulation modeling calculations. Background technique [0002] High voltage direct current (HVDC) technology has been widely used in my country, but it will cause some neutral point grounding transformers to produce different degrees of DC bias phenomenon when operating in the single pole ground loop mode, which will cause the temperature of the transformer to increase. The rise, loss increase, and vibration intensify seriously threaten the safe and stable operation of the power system and must be suppressed. The correct calculation of the distribution of DC current in the AC grid when the DC system operates at a single pole is the premise of controlling the DC bias. [0003] At present, under the single-...

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Problems solved by technology

It can be seen that the modeling methods of the soil electric field model and the resistance model both need to collect the specific parameters of the soil between the ground electrode and the substation, and the workload is relatively large. For soils with complex structures, although geology has accurate exploration and modeling methods, it is difficult to Its coverage area is far from the size of the AC grid, and the soil model is difficult to establish accurately

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