LIU Yongsheng,CHEN Jun,LI Juan,et al.Distributed Protection Scheme for DC Distribution Network Based on Current Transients[J].Automation of Electric Power Systems,2021,45(5):159-167.
LIU Yongsheng,CHEN Jun,LI Juan,et al.Distributed Protection Scheme for DC Distribution Network Based on Current Transients[J].Automation of Electric Power Systems,2021,45(5):159-167. DOI: 10.7500/AEPS20200321002.
Distributed Protection Scheme for DC Distribution Network Based on Current Transients
Low-voltage DC distribution network has the characteristics of short duration of fault current
variable system operation mode and fault current oscillation
which challenges the correct judgment and fault location of relay protection. In this paper
the fault characteristics of low-voltage DC distribution networks are analyzed in detail
and a DC network protection scheme including the current direction comparison method
direction prediction method and extreme value comparison method is proposed. The protection unit with the proposed scheme can quickly locate the fault area and complete the fault clearing and isolation after the DC distribution network fault occurs. In order to facilitate the engineering application of the protection scheme
the generic object oriented substation event (GOOSE) communication is used to realize the information exchange between the protection units
and the protection strategy of “instant memory of single branch
delayed location of multi-branch” is proposed to solve the practical problems such as short duration of fault current and asynchronous data transmission. Real-time digital simulation (RTDS) test results show that the protection can correctly identify the fault area within 5 ms after the fault occurs.
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