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A protection method and system for direct current grid partition

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

Active Publication Date: 2021-11-19
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
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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

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  • A protection method and system for direct current grid partition
  • A protection method and system for direct current grid partition
  • A protection method and system for direct current grid partition

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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 present invention provides a protection method and system for partitioning a DC power grid. The protection method includes the steps: the protection method includes the steps: a DC protection unit RPU installed on the tie line of the DC power grid collects fault protection information of a fault isolation device, And judge whether to start its own protection action according to the fault protection information to realize partition fault isolation between DC grids; the local measurement and protection unit LMPU located in the DC grid partition judges whether to start its own protection action based on the fault protection information to realize Fault isolation between the DC grid and the AC grid. The present invention adopts a layered and partitioned DC power grid fault protection framework, each LMPU system is independent of each other, and the coupling relationship between each LMPU and between the LMPU and the upper RPU is less.

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 Patents(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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