A novel principle dispensing with data synchronization for distributed bus protection

Yang, Chengzi; Song, Guobing; Shen, Q. Y.

doi:10.1049/cp.2014.0115

Cited by 1 publication

(1 citation statement)

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“…During the data transmission process, link congestion and routing self-healing reconstruction may occur due to data storms. Therefore, the uncertainty of the transmission delay of the data will cause a large phase difference, calculation error and even a wrong operation of the protection [15,16]. For the new wide-area differential protection that needs to adaptively construct the protection range according to the grid network topology, the end points and data links of the protection are not fixed, and the transmission delay of the data at each end is more uncertain.…”

Section: Introductionmentioning

confidence: 99%

New Principle of Fault Data Synchronization for Intelligent Protection Based on Wavelet Analysis

Wang¹,

Hong

Liu

et al. 2022

Proceeding of 2021 International Conference on Wireless Communications, Networking and Applications

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In order to eliminate the influence of the delay error of the sampled value in the data link on the longitudinal differential protection device, this paper proposes a protection data self-healing synchronization algorithm based on wavelet transform to calculate the moment of sudden change. First, calculate the mutation amount of the sampled data at each end in real time. When the mutation amount threshold is exceeded, it is determined that the multi-terminal system has a short-circuit fault. Then, according to the sudden change characteristics of the collected current waveform, the wavelet modulus maximum value is used to extract the fault sudden change time of each end data, based on the fault time at one terminal, the automatic compensation for the time differences between this terminal and others are realized, thus a new sampling sequence is formed. The resynchronized sampling sequences are used to calculate the differential current and braking current after fault to ensure the correct action of the protective device. Through theoretical analysis and simulations, the correctness and effectiveness of the proposed algorithm is verified; in addition, it is shown that this algorithm can improve the reliability of actions by the intelligent protection device, thus realizing protections such as multi-terminal differential, wide-area differential, etc.

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Section: Introductionmentioning

confidence: 99%