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Method for distinguishing shutting of +/-800 kV extra-high voltage direct-current valve group

A discrimination method and DC valve technology, applied in the circuit breaker test and other directions, can solve the problem that there is no better solution for the blocking discrimination method of the DC transmission system valve group, and achieve the effect of accurate and reliable discrimination.

Active Publication Date: 2012-06-13
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no better scheme disclosed for the discrimination method for the blockage of the valve group in the DC transmission system;

Method used

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  • Method for distinguishing shutting of +/-800 kV extra-high voltage direct-current valve group
  • Method for distinguishing shutting of +/-800 kV extra-high voltage direct-current valve group

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Embodiment Construction

[0034] Each of the two poles of the 800kV DC transmission system is composed of two 400kV valve groups in series, and each valve group corresponds to two converter transformers, so four valve groups correspond to four converter transformers. figure 1 The block-out judgment logic of the DC valve group shown in the present invention uses the full stability control device of the present invention to access the three-phase current and voltage of four converter transformers, as well as the operation and shutdown status of the DC valve group and the emergency shutdown signal of the DC valve group Wait for the switching value.

[0035] figure 1 A specific embodiment of the mutation initiation element shown in is as follows:

[0036] The device uses digital sampling to collect the three-phase current and three-phase voltage of the converter transformer. The sampling rate is 1200 points / second, and the cycle (20ms) samples 24 points. The device calculates the three-phase current value...

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Abstract

The invention provides a method for distinguishing the shutting of a 800 kV extra-high voltage direct-current valve group. A direct-current power transmission system is composed of two poles and each pole is composed of two 400 kV valve groups; each valve group corresponds to a relevant converter transformer; a stable control device is used for collecting three-phase current and three-phase voltage of the converter transformer; when the following three conditions are met, a valve group shutting or emergent stopping signal sent by a direct-current pole control system is received and the valve group is confirmed to have faults and the valve group is shut by time delay; and the three conditions are as follows: (1) a mutational volume starting of changes of current or power of the converter transformer is carried out; (2) after the mutational volume starting, a current real-time power Pdck of the converter transformer is less than 'a stopping threshold constant value, namely a stopping power constant value of the direct-current valve group' Pdcstop; after a direct-current system has the pole shutting, the Pdck (Pdcstop) is judged; and (3) before the mutational volume starting, a power Pdc_ of the converter transformer at a previous moment is more than a pre-set operation threshold constant value, namely 'a run power constant value of the direct-current valve group' Pdcrun.

Description

technical field [0001] The invention relates to a method for judging the blockage of a DC valve group of a DC transmission system in a power system. Background technique [0002] HVDC transmission system has been widely used in long-distance high-power transmission of domestic power system and regional interconnection grid. The transmission power of the HVDC transmission system is large. After the DC system fails or is blocked, it will cause a large power transfer or system power imbalance, which seriously threatens the safe and stable operation of the power grid. [0003] According to the provisions of my country's "Guidelines for the Safety and Stability of Power Systems", as the second-level safety and stability standard for the power system's ability to withstand large disturbances, when a bipolar fault occurs on a DC transmission line, the safety and stability control system can take necessary control measures to ensure that the power grid stable operation. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327
Inventor 任祖怡夏尚学陈松林徐柯何强白杨刘伟
Owner NR ELECTRIC CO LTD
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