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A Fault Diagnosis Strategy Based on Multi-level Feature Extraction for Grid-Connected Inverter
投稿时间:2021-01-22  修订日期:2021-02-26
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DOI:
Keywords:cascaded H-bridge multilevel inverters, grid-connected, feature extraction, faults diagnosis.
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
              
AuthorInstitutionEmail
GENG Junchao Shanghai Maritime University gjc0927@163.com
WANG Tianzhen Shanghai Maritime University tzwang@shmtu.edu.cn;wtz0@sina.com
HAN Jingang jghan@shmtu.edu.cn
CHEN Guodong chengd@shanghai-electric.com
TANG Tianhao thtang@shmtu.edu.cn
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Abstract:
      Due to reduced harmonic content, reduced switching losses, and easy modularization, the cascaded H-bridge multilevel inverter is widely used in renewable energy grid-connected system. As the number of levels increases, the number of power switches (IGBTs) also increases, and the corresponding fault probability and fault types are also increasing. Under multi-fault conditions, the traditional fault feature extraction method cannot effectively extract the key features of the fault, resulting in a decrease in the accuracy. To solve this problem, a fault diagnosis strategy based on multi-level feature extraction is proposed. Firstly, PCA is used to preliminarily extract the fault features, then the key fault features are extracted based on the Euclidean distance threshold, and finally the ELM classifier is used to complete the fault diagnosis. Experimental results show that the proposed method has fewer input feature vector dimensions and higher fault diagnosis accuracy.
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