A wavelet based protection scheme for distribution networks with Distributed Generation

Mahmood Shaik, M. Nageswara Rao, S. A. Gafoor
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引用次数: 9

Abstract

Integration of Distributed Generation (DG) in distribution power system would affect the fault current level and therefore the relay settings. This paper presents a protection scheme based on the Wavelet Transforms for the detection of the faults with and without DGs. Faults are simulated at each bus and the fault currents are analyzed with Haar wavelet to obtain detail coefficients of single level decomposition. Fault indices are calculated based on d-coefficients and compared with threshold for detecting the fault. The performance of the proposed protection scheme is tested by considering the variations in location and capacity of DG successfully.
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一种基于小波的分布式发电配电网保护方案
分布式发电在配电系统中的集成将影响故障电流水平,从而影响继电器的整定。本文提出了一种基于小波变换的故障检测方案,用于检测带和不带dg的故障。对各母线进行故障模拟,利用Haar小波对故障电流进行分析,得到单级分解的详细系数。基于d系数计算故障指标,并与阈值进行比较,实现故障检测。通过考虑DG的位置和容量变化,成功地测试了所提出的保护方案的性能。
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