Control method and system for current limiting functional module of double-circuit DC ground electrodes on the same tower

A technology of current limiting and functional modules, applied in the direction of emergency protection circuit devices, electrical components, circuit devices for limiting overcurrent/overvoltage, etc., can solve the problems of oil and gas pipelines and AC transformers that cannot operate safely.

Active Publication Date: 2019-04-09
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on this, it is necessary to solve the problem that the oil and gas pipelines and AC transformers near the DC transmission system cannot operate safely due to the excessive grounding current in the traditional double-circuit DC transmission system on the same tower, and provide a method that can quickly and effectively reduce the grounding. Control method and system for dual-circuit DC grounding electrode current limiting function module of pole-into-ground current on the same tower

Method used

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  • Control method and system for current limiting functional module of double-circuit DC ground electrodes on the same tower
  • Control method and system for current limiting functional module of double-circuit DC ground electrodes on the same tower
  • Control method and system for current limiting functional module of double-circuit DC ground electrodes on the same tower

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Embodiment Construction

[0021] In one embodiment, such as figure 1 As shown, a control method for a dual-circuit DC ground electrode current limiting function module on the same tower, including steps:

[0022] S100. Obtain the operation wiring mode and operation mode of the direct current circuit in the double circuit direct current circuit on the same tower.

[0023] The schematic diagram of the rectifier side of the double-circuit DC on the same tower is as follows: figure 2 As shown, it includes two DC loops (DC loop 1 and DC loop 2), each loop includes two poles (DC loop 1 includes loop 1 pole 1 and loop 1 pole 2, DC loop 2 includes loop 2 pole 1 and loop 2 pole 2 ), each DC has a ground electrode lead (IDEE_T1 and IDEE_T2 in the figure), the ground electrode current flowing through IDEE_T1 and IDEE_T2 is the ground electrode current of this circuit, and finally it is aggregated to the ground electrode through a ground electrode lead, and flows through the ground The pole current is IDEE (=ID...

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Abstract

The invention relates to a control method and system of a same-tower double-circuit DC grounding pole current limiting function module. When any one of two poles of a current DC circuit is in a ground loop operation mode, the grounding pole current limiting function module is controlled to send a current limiting instruction to the current DC circuit; when the current DC circuit is in a metal loop operation mode, and an operation mode of the current DC circuit is a double-circuit power control module or any one of two poles of an opposite-side DC circuit is in the ground loop operation mode of the double-circuit power control module, the grounding pole current limiting function module is controlled to send a current limiting instruction to the current DC circuit; and, when the current limiting instruction is detected, and the DC circuit is in a monopolar ground loop operation mode or a double-pole ground loop operation mode in which currents at two poles are unbalanced, the grounding pole current limiting function module is controlled to set an upper limit of a frequency limit control modulation quantity of the DC circuit to be 0. So a grounding pole earth current can be rapidly and effectively reduced.

Description

technical field [0001] The invention relates to the technical field of DC power transmission, in particular to a control method and system for a dual-circuit DC ground electrode current limiting function module on the same tower. Background technique [0002] High-voltage direct current transmission technology has the advantages of no inductive reactance and no synchronization problems in long-distance large-capacity power transmission and power system networking. The ground loop operation mode adopts the current return path composed of the earth, and the metal loop operation mode adopts the ground potential current return path, which can prevent the direct current from flowing through the earth. The double-circuit DC on the same tower includes two DC circuits, and each DC circuit includes two poles. The main operation wiring methods are: two-circuit DC bipolar operation; one DC bipolar operation, one DC single-pole ground return Line operation mode; one DC bipolar operatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02
CPCH02H9/02
Inventor 朱益华郭琦李书勇
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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