Scheme and Operation Characteristic Analysis of Large Sending Terminal DC Grid Based on Flexible DC in West China

Li, Huiling; Shu, Zhan; Zheng, Chunmiao; Song, Yunting; Ding, Ping; Chen, Xinglei

doi:10.1109/ei247390.2019.9062242

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In different stages of dc fault, the DCCB shows different equivalent impedances. Therefore, the value of θ P changes, leading the natural-frequency characteristic expressed in (6) to be different. According to the working principle and different operation stages of the DCCB, the system equivalent circuits can be divided into the following three stages, respectively, shown in Figure 2b-d.…”

Section: Natural-frequency Characteristic In Different Stages Of DC F...mentioning

confidence: 99%

“…So it is difficult to determine the fault signal dimension N previously. As long as the signal dimension given for MUSIC is inappropriate, the estimated natural frequencies of the fault signal may have large errors, leading to large error of calculated FIGURE 6 The spectrums when N is selected inappropriately. (a) The P MUSIC (f) spectrum after pole-to-pole fault, and N is selected as 13 and (b) the P MUSIC (f) spectrum after pole-to-ground fault, and N is selected as 47 fault distance.…”

Section: The Music Algorithmmentioning

confidence: 99%

“…With the rapid development of renewable energy power generation, more and more regional renewable energy sources need to be integrated into the power system [1][2][3]. The flexible dc grid, which is mainly dependent on the voltage source converter technology, has outstanding superiority in integration of large-scale renewable energy power generation, thus obviously will occupy an important position in the future power system [4][5][6][7]. In addition, for economic consideration, the overhead line will be widely applied to replace dc cable in future flexible dc grid, which, however, means that the fault probability becomes higher [8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The improved fault location method for flexible direct current grid based on clustering and iterating algorithm

et al. 2021

IET Renewable Power Gen

View full text Add to dashboard Cite

The fault location method based on the natural frequency of the fault travelling wave has outstanding superiority in high-voltage dc system, because of high operation speed, acceptable sampling rate, and so on. However, in flexible dc grid, the natural-frequency characteristic is quite different from that in conventional high-voltage dc system, meaning the existing fault location method cannot be directly used. This paper analyses the distance-frequency characteristics in different stages of fault period (from fault occurrence to fault isolation) in flexible dc grid, to find a suitable stage for fault location. On the basis of this, the improved fault location method based on clustering and iterating algorithms is proposed. Compared with the traditional method which directly uses the multiple signal classification algorithm to estimate the natural frequency for fault location, the proposed method can effectively eliminate the large error caused by signal dimension fluctuation and false spectrum peak of multiple signal classification algorithm. Finally, simulation cases are carried out to prove the feasibility and superiority of the proposed method.

show abstract

Section: Natural-frequency Characteristic In Different Stages Of DC F...mentioning

confidence: 99%

Section: The Music Algorithmmentioning

confidence: 99%