A Study on Power Quality Transient Disturbance Location Method

[摘要] Due to periodic variation of power signal and various disturbances present during sampling process, resulting background gradient affects the accuracy of disturbance detection. In order to solve this problem, this paper proposes a power quality transient disturbance location method based on morphological edge detection, and introduces a soft threshold quantitative evaluation method to improve its accuracy. Firstly, an evaluation method of filtering effect is proposed, and original signal is filtered by adaptively choosing size of structuring elements. Then, Top-Hat transform of morphological gradient is performed by flat structuring elements to suppress background gradient, and the location result is initially obtained. Finally, combined with soft threshold processing method, the location of power quality transient disturbance is realized. Simulation analysis of a series of power quality transient disturbances shows that this algorithm has accurate location results, strong capacity of resisting disturbance and good versatility.

[发布机构] Shenzhen Power Supply Co., Ltd, Institute of Electric Power Science, Guangdong Province, Shenzhen; 518020, China^1

[效力级别] 电工学

[关键词] Disturbance detection;Morphological edge detection;Morphological gradient;Periodic variation;Quantitative evaluation methods;Simulation analysis;Structuring element;Transient disturbances