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High-voltage direct-current grounding limiting current control method and system

A limiting current, high-voltage DC technology, applied in emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, and can solve problems such as current overshoot, DC transmission power loss, etc.

Active Publication Date: 2021-02-19
CSG EHV POWER TRANSMISSION +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the set current drop rate is too large, due to the hysteresis of the analog quantity acquisition and control strategy itself, there may be over-regulation of the drop current of the pole with a larger actual current value, resulting in the loss of DC transmission power

Method used

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  • High-voltage direct-current grounding limiting current control method and system

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Embodiment

[0076] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof in the embodiments of the present invention are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to Those steps or elements are not explicitly listed, but may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

[0077] In the description of the pr...

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Abstract

The invention discloses a high-voltage direct-current grounding limit current control method, and relates to the technical field of high-voltage direct-current engineering. The method comprises the following steps of acquiring the first current actual values of a pole 1 and a pole 2 of a direct-current system, and judging whether the grounding electrode current control is started or not accordingto a grounding limit current activation criterion; if the grounding limit current criterion is activated, calculating a first current limit target value and a second current limit target value; and comparing the first current limiting target value with the second current limiting target value, determining a final current limiting target value, and taking the final current limiting target value asa current limiting value for grounding electrode current control. According to the invention, accurate and dynamic limit control on the pole with a large actual current value is realized through grounding limit current control.

Description

technical field [0001] The invention relates to the technical field of high-voltage direct current engineering, in particular to a high-voltage direct current grounding limiting current control method and system. Background technique [0002] The high-voltage direct current project needs to configure the grounding limit current function in order to protect the grounding pole from overcurrent damage to the grounding pole equipment. When the two poles of DC are running at the same time, the ground electrode current is collected and compared with the current setting value allowed to flow through the ground electrode. The larger pole implements the current limiting strategy according to the set rate, and the lowest limit can be limited to the minimum current value of the normal operation of the pole. When the actual value of the ground electrode current is lower than the ground electrode current setting value, the current limit will stop. When the set current drop rate is too ...

Claims

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Application Information

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IPC IPC(8): H02H9/08
CPCH02H9/08Y02E60/60
Inventor 王胜赵建宁董言乐张楠陈璐吴庆范王亚涛张群芦明明宋延涛涂仁川刘旭辉许朋见靳巩磊范保丰汪秀才庞科伟张玲
Owner CSG EHV POWER TRANSMISSION
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