Protection method for multilevel direct current distribution feeder line

A technology of DC power distribution and DC bus, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as "multi-level" feeders that cannot be directly applied

Active Publication Date: 2015-09-23
河北科讯通信器材有限公司
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  • Abstract
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Problems solved by technology

[0004] The above protection schemes are mainly aimed at "single-stage" DC lines, but due to their special structures or uses, their line protection schemes are not traditional distribution feeder protection and have strong The particularity of the inverter, and most of them are aimed at on

Method used

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  • Protection method for multilevel direct current distribution feeder line
  • Protection method for multilevel direct current distribution feeder line
  • Protection method for multilevel direct current distribution feeder line

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Embodiment Construction

[0053] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] A multi-level DC distribution feeder, the system structure is as follows figure 1 As shown, the multi-level DC feeders are Cable A, Cable B, ... Cable M, in which the line protection and DC circuit breakers are respectively arranged at the head end of each level of feeder, and the DC circuit breaker is from the left (that is, the end connected to the converter) To the right are DC circuit breaker A, DC circuit breaker B, ... DC circuit breaker M, the line protection includes Hall current sensor 1, protection judgment module 2, protection operating mechanism 3, Hall current sensor 1, protection operation Mechanisms 3 are all connected with DC circuit breakers. The mains-side converter controls the voltage of the DC network. The feeders at all levels are equipped with two sections of protection, respectively protection section I and pr...

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Abstract

The invention discloses a protection method for a multilevel direct current distribution feeder line. The protection method is implemented according to the following steps specifically: step one, collecting the current ix(k) at the outlet of each level of direct current bus of the multilevel direct current distribution feeder line, and calculating a current increment measured value delta ix(k), wherein x is A, B, ..., M level, and k is the sampling number of the current at the outlet of each level of direct current bus; step two, judging the fault section of the multilevel direct current distribution feeder line; and step three, restarting a current converter. The protection method for the multilevel direct current distribution feeder line disclosed by the invention can be matched with the protection of the current converter, the fault section of the direct current feeder line can be identified correctly, a cutting fault is protected by a corresponding feeder line, and adjacent feeder lines are protected from operating falsely, so that the action selectivity of a direct current circuit breaker is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of relay protection for DC distribution networks, and in particular relates to a protection method for multi-level DC distribution feeders. Background technique [0002] With the rapid growth of power load, the existing AC distribution network is increasingly limited by the power supply radius, especially the large number of applications of power electronic devices have injected a large number of harmonics into the AC distribution system, and the power quality of the AC distribution network has also been affected. severe impact. With the rapid development and wide application of high-voltage direct current transmission technology and flexible direct current technology, experts and scholars at home and abroad have proposed to conduct direct current power supply at the voltage level of power supply and distribution in recent years. Compared with the AC power distribution system, the DC power distribution syst...

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Application Information

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IPC IPC(8): H02H7/26
Inventor 段建东杨青孙原冰周一崔帅帅
Owner 河北科讯通信器材有限公司
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