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Modular multilevel converter (MMC) is a promising converter in medium and high voltage applications due to its modularity and easiness to meet any voltage level by cascading the sub-modules. However, large amount of modules not only increase the failure probability of the devices, but also increase the difficulty of the fault diagnosis, which have brought a challenging for popularization and application...
A fault diagnosis strategy for open-circuit failure of semiconductor switching device in modular multilevel converters is proposed in this paper. Fault detection and location are both included in this strategy. An extended state observer based on arm current equation is put forward and designed. The inputs of the observer are the arm current, ac voltage, and the dc link voltage. The observer is used...
This paper presents a fault diagnosis technique for high-resistance connection (HRC) in nine-phase flux switching permanent magnet (FSPM) machine, which is based on zero sequence voltage components (ZSVC). Firstly, a nine-phase FSPM machine topology is introduced and no-load back electromotive force (EMF) waveforms are analyzed. Then the nine-phase FSPM machine with HRC is modeled and the influence...
This paper presents a fault diagnosis method for direct-drive wind turbine with permanent magnet synchronous generator (D-PMSG) by using generator control loop current signals. In this method, the Vold-Kalman filtering order tracking technique is used to track the fault characteristic harmonic components from q-axis current signals. Then the envelopes of amplitudes of the fault harmonic components...
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