Abstract
The demand for low voltage DC (LVDC) distribution systems is increasing due to the rapid development of power conversion technology, the increase of DC-based digital loads, and the expansion of DC-based distributed generation (DG). For the stable operation of the LVDC distribution system, it is necessary to develop a protection method. In this paper, the fault section is estimated using wavelet transform (WT) in LVDC distribution system. The fault section is classified into a DC line and a DC bus. The characteristics of fault current at each fault section part are analyzed in simple and actual LVDC system. Based on this analysis, the algorithm for fault section estimation is proposed using the detail component after performing WT. The results of fault section estimations are verified through various simulations using EMTP and MATLAB. The fault section estimation can be utilized in the development of protection schemes in LVDC distribution system.
Highlights
IntroductionThe DC power supply method reduces power losses through high efficiency conversion that reduces the number of alternating current (AC)/DC power conversions, which can be a very effective countermeasure at a time when global warming is urgently needed
In [16], a fast and effective variational mode decomposition (VMD)-based fault detection technique was proposed for the low voltage DC (LVDC) distribution system with penetration of renewable sources using the local end current measurements only
Α is a threshold value to distinguish the fault section. If it is larger than this value, it is judged as LVDC bus fault; if it is smaller than this value, it is judged as LVDC line fault
Summary
The DC power supply method reduces power losses through high efficiency conversion that reduces the number of AC/DC power conversions, which can be a very effective countermeasure at a time when global warming is urgently needed. In [7], a novel local measurement-based fault location algorithm was proposed for tightly coupled LVDC distribution systems. In [12], a theoretical analysis with fewer errors was used to develop protection schemes and short-circuit fault locations based on transient- and steady-state analytic formulas. In [15], a detection method of the pole to ground fault in ungrounded LVDC distribution grid was proposed using the discrete wavelet transform of measurement current by signal injection method. In [16], a fast and effective variational mode decomposition (VMD)-based fault detection technique was proposed for the LVDC distribution system with penetration of renewable sources using the local end current measurements only. The method for fault section estimation using WT is proposed in a LVDC distribution system.
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