FAULT LEG DETECTION FOR OPEN-CIRCUIT FAULTS IN PWM VOLTAGE-SOURCE INVERTERS OF RENEWABLE ENERGY VIA THE FUZZY LOGIC DIAGNOSTIC METHOD

Cheng-Chang Chen；Yu-Hsun Lin；Bwo-Ren Ke；Ching-Wen Hsue；Han-Chang Hsieh

inverter ； open-switch fault ； fuzzy logic ； fault leg detect

技術學刊

32卷4期（2017 / 12 / 01）

299 - 308

英文

An inverter is a critical piece of equipment for connecting green energy to a power grid, and whether the inverter equipment works normally will influence if the electrical energy generated by green energy can be smoothly transmitted to the power grid. This study explores the influence of a single thyristor and transistor open-circuit faults of an inverter on the output current waveform of the inverter. A computer is used to simulate the fault symptoms of the inverter, and the fault features are discussed, Clarke's transformation is used to transform a three-phase current signal into stationary coordinates in order to observe the distributional characteristics. An expert system is constructed using fuzzy logic to analyse and evaluate the running state of the inverter, and a testing machine is used in the laboratory to test the feasibility of the proposed method. The results show that this method can implement analysis and evaluation of the running state of an inverter.

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