Design method and grounding grid of converter station grounding grid that can replace DC grounding pole

Abstract

The invention discloses a design method of a converter station ground network capable of being used as a substitute for a DC ground electrode, and the ground network. The design method comprises stepsthat A, a first feeder cable is set to connect from a valve hall ground point to the converter station ground network; B, corrosion thickness of a ground network conductor under the unipolar earth loop current and the bipolar unbalanced current is calculated, and the section size of the ground network conductor is determined; contact potential difference of the ground network is acquired throughcalculation, if the contact potential difference under the DC transmission earth return operating current exceeds a preset contact potential difference limit value, the position of which the contact potential difference exceeds the limit value is added with the ground network conductor, so the contact potential difference decreases to the contact potential difference limit value; and C, a second feeder cable is utilized to connect ground equipment of the converter station ground network with the converter station ground network. The design method is advantaged in that all the functions of a traditional converter station ground network and a DC ground electrode can be realized through an established converter station ground network, the method is safe and reliable, and low cost and high benefit are realized.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a design method for a grounding grid of a converter station that can replace a direct current grounding pole, and the grounding grid of a converter station. Background technique [0002] The DC grounding electrode is an important part of the DC transmission project. It serves as a part of the circuit to directly transmit power to the system during unipolar operation, and clamps the neutral point potential of the converter station (rectifier valve) during bipolar operation to avoid the voltage difference between the two poles and the ground. balance and damage the equipment. With the rapid development of UHV DC transmission projects in my country, it is becoming more and more difficult to select the site of DC grounding electrodes. In the actual project construction and construction process, due to external reasons such as land acquisition and site selection, ...

AI Technical Summary

Problems solved by technology

In the actual project construction and construction process, due to external reasons such as land acquisition and site selection, the ground electrode cannot be put into production as scheduled, which affects the smooth commissioning of the bipolar poles of the DC transmission project, and seriously hinders the economic and social benefits of large-capacity and long-distance power transmission.

At present, few scholars, research institutions or equipment manufacturers at home and abroad have carried out research on other grounding devices that can replace DC grounding electrodes, and research on them is undoubtedly forward-looking and practical

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