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논문 기본 정보

자료유형
학술대회자료
저자정보
Dehong Zhou (Nanyang Technological University) Huan Qiu (Nanyang Technological University) Shunfeng Yang (Southwest Jiaotong University) Yi Tang (Nanyang Technological University)
저널정보
전력전자학회 ICPE(ISPE)논문집 ICPE 2019-ECCE Asia
발행연도
2019.5
수록면
1,830 - 1,835 (6page)

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초록· 키워드

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Fault diagnosis is indispensable for the reliable operation of modular multilevel converters (MMCs). This paper presents a submodule voltage similarity-based, real-time and fast open-circuit fault diagnosis method for MMCs. The proposed fault detection and location (FDL) method is derived based on the similarity analysis of capacitor voltages under both normal and fault conditions. Due to the absence of the discharging current path caused by the open-circuit fault, capacitor voltage of the submodule with the faulty switch will differ from those with healthy switches. This characteristic can be extracted by designing the correlation coefficients of the capacitor voltages at the same arm. With the help of correlation coefficients, the opencircuit fault can be located at the early stage before the capacitor voltage is charged very high. All the data required for the proposed FDL method can be obtained by the available sampled data for the control scheme of MMCs. No extra measurement or hardware is required. Experimental results validate that the proposed FDL method can detect and locate the open-circuit fault rapidly and accurately within one fundamental period.

목차

Abstract
I. INTRODUCTION
II. BEHAVIOR ANALYSIS OF THE MMC UNDER OPEN-CIRCUIT-FAULTS
III. PROPOSED FAULT DETECTION AND SIMILARITY-BASED FAULT LOCATION METHOD
IV. EXPERIMENTAL RESULTS
V. CONCLUSIONS
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