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Method and system for protecting subareas of direct-current (DC) power grids

A DC power grid and DC protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of high cost and high cost of fault isolation devices, and achieve the effects of reducing the range, alleviating the impact of faults, and improving control efficiency

Active Publication Date: 2017-05-31
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the common equipment for fault isolation is DC circuit breaker (DCCB) or DC / DC converter with fault self-clearing function, but these two types of equipment are expensive, and it is expensive to install fault isolation devices at the outlets of each device

Method used

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Embodiment Construction

[0032] The technical solution of the present application will be further described in detail below in conjunction with the accompanying drawings of the description.

[0033] In order to take economical into account, the present invention considers to install a certain fault isolation device only at key points or weak points of safety and stability of the DC power grid, to isolate the faulty area and the non-faulty area as soon as possible, and to reduce the scope of the fault as much as possible, so as to realize the protection of the DC power grid. Partition protection.

[0034] 1. Partition protection method

[0035] Based on fault analysis and calculation, the system can be divided into several areas for the purpose of applying the least fault isolation devices and improving economy.

[0036] Such as figure 2 As shown, taking the installation of DCCB at the key points of the DC grid regional tie line as an example, the implementation logic of the DC grid regional protect...

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Abstract

The invention provides a method and a system for protecting subareas of direct-current (DC) power grids. The method comprises the steps of using DC protection units (RPUs) arranged on connecting lines of the DC power grids to collect fault protection information of a fault isolation device, and judging whether protection actions of the RPUs are started or not according to the fault protection information, so as to realize the subarea fault isolation among the DC power grids; using local measurement and protection units (LMPUs) arranged in the subareas of the DC power grids to judge whether protection actions of the LMPUs are started or not based on the fault protection information, so as to realize the fault isolation between the DC power grids and alternating current (AC) power grids. According to the method and the system, a layered and divisional DC power grid fault protection frame is adopted, and all LMPU systems are independent of one another, so that the coupling relationships between the LMPUs and between the LMPUs and the upper layer RPUs are fewer.

Description

technical field [0001] The invention relates to the field of direct current power grids, in particular to a partition protection method for direct current power grids based on the judgment and decision-making of fault information of the whole network. Background technique [0002] The DC power grid contains many lines and converters. These converters are all devices that can be adjusted according to a given control strategy, and at the same time, necessary component protection is configured. If the component protection of these devices is independently activated based on locally collected information as a criterion to clear internal faults, then after the DC power grid fails, each key equipment component can only act based on the collected information reflecting the operating status of the adjacent area. When the DC power grid is extended to a larger complex power grid, this kind of component protection may not meet the requirements of selectivity, quick action and fault pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 魏春霞姚良忠李琰迟永宁杨波王志冰刘超曹远志吴婧谢立军
Owner CHINA ELECTRIC POWER RES INST
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