A Modeling Method of Soil Equivalent Resistance Model

Abstract

The invention discloses a soil equivalent resistance model modeling method which combines multiple and multi-point actual measurement data of a power grid with simulation modeling calculation. Its characteristic is to improve the existing soil equivalent resistance model building method by using a hybrid modeling method combining measured data and simulation calculations. For any circuit of the AC line between the two substations, multiple multi-point measurements are made on the AC grid to obtain multiple sets of DC current distribution data at the neutral points of the main transformers of each substation within the modeling range, and through simulation calculations and inversion methods Construct the soil equivalent resistance model. The invention does not need to collect detailed soil parameters, has high calculation accuracy, overcomes the problem that it is difficult to accurately establish a non-uniform layered soil model in the previous method, and is suitable for accurately calculating the distribution of DC current in an AC system when the soil composition is complex.

Description

technical field [0001] The invention belongs to the field of high-voltage direct current transmission, and in particular relates to a soil equivalent resistance model modeling method combining 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-pole operat...

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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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