DC distribution network networked protection system
A DC distribution network and protection system technology, applied in the direction of overcurrent protection, emergency protection circuit devices, electrical components, etc., can solve the problems of failure to judge fault information and achieve simple and reliable protection, simple scheme, The effect of increasing selectivity
Active Publication Date: 2019-10-08
XUJI GRP +2
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Problems solved by technology
[0005] The purpose of the present invention is to provide a DC distribution network networked protection system to solve the problem that each bay only performs fault judgment based on its own fault information, and cannot perform more accurate fault judgment in combination with fault information from other bays
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[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0038] The invention provides a DC distribution network, such as figure 1As shown, the DC distribution line is included, and the DC distribution line is divided into at least one bus bar area and at least one tie line area, each bus bar area includes at least one bus bar bay, and each tie line area includes at least one tie line bay. The above-mentioned DC distribution network is divided into two types of areas: the DC bus bar and the DC link line, such as figure 2 As shown, each bay in each area is equipped with the same local protection unit and operates independently.
[0039] Based on the above-mentioned DC distribution network, a DC distribution network network protection system is formed, such as image 3 As shown, it includes busbar bay in-situ protection units for setting in each busbar bay, and each busbar bay in-situ protection unit corresponds t...
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The invention relates to a DC distribution network networked protection system. The DC distribution network is divided to at least one bus area and at least tie line area, wherein each bus area is divided into at least one bus interval; each tie line area is divided to at least tie line interval; each bus interval and each tie line interval are provided with a bus interval in-situ conservation unit and a tie line interval in-situ conservation unit; each bus interval in-situ conservation unit is corresponding to each bus interval; and each tie line interval in-situ conservation unit is corresponding to each tie line interval. Each area is configured with protection functions of different principles and logics, each protection unit in an area of a different type can be combined with the fault information of other interval protection units in the area to accurately position a fault, and the DC distribution network selectivity and the power supply reliability are improved.
Description
technical field [0001] The invention relates to the technical field of relay protection for power system distribution networks, in particular to a networked protection system for DC distribution networks. Background technique [0002] With the increasing DC power load and the access of more and more new energy sources such as photovoltaics and wind power, the traditional AC power grid has produced a series of power quality problems. On the one hand, the intermittent fluctuation characteristics of new energy sources lead to irregular fluctuations and impacts of system voltage and frequency, and power electronic equipment injects complex harmonics into the system. On the other hand, when DC loads such as DC charging piles and data centers are powered by AC power, the power supply must be transformed in multiple stages to work, resulting in large losses. Compared with such problems in AC distribution network, DC distribution network has unique technical advantages. As an impor...
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Login to View More IPC IPC(8): H02H7/26H02H3/08
CPCH02H3/08H02H7/268
Inventor 刘洋李俊刚姜睿智孟乐常彦彦孙文龙吴水兰张建雨薛建民张敬安庞杰锋冀娟
Owner XUJI GRP