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In this paper, the authors present the modelling of the impedance variation of an inverter DC bus. Modelling is done by application of the PEEC method (partial element equivalent circuit) with an additional method for computing the local charge density (analytical formulas) in order to give the local capacity. This method has been implemented so as...
Contexts in source publication
Context 1
... the range of the dozen of kW inverters, the DC bus geometry is rather complex, as shown in Fig. 1. The Partial Element Equivalent Circuit -PEEC -model, introduce by A.E. Ruehli [3] in the seventies, is widely used nowadays so as to obtain an electrical equivalent cir- cuit of a set of conductors. This method extracts resistive (R), mutual inductive (Lp) partial electrical elements. In its theoretical development the (Lp, C, R) PEEC ...
Context 2
... whose fundamental sta- tor frequency in operation was chosen to be equal to fs = 43 Hz. This particular value allows measurement to be inde- pendent of the natural 50 Hz power supply frequency. In the same way, modulations of the low frequency, due to the time varying load, are created around the fundamen- tal stator frequency, as represented in Fig. 10 with 9 ...
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Citations
This paper proposes a detection method of open-circuit fault of insulated-gate bipolar transistor in the voltage source inverters. The magnetic field signal at the DC bus of the inverter is collected and analysed to detect the fault. First, the simulation is developed for a voltage source inverter-fed induction machine drive which operates in healthy state and single switch open-circuit conditions. The faulty characteristic frequencies in the spectrum of DC-link current signal are derived on the basis of the power balance analysis through the inverter. Second, laboratory tests are implemented with a test bed of voltage source inverter-based induction machine drive in which a Hall sensor suited for the geometry complexity of the DC bus structure is utilized for measuring the magnetic field signal, which can be considered as an image of the simulated DC-link current. The fast Fourier transform of the magnetic field signal shows sharp increases in spectrum amplitude at the fundamental, second-order and third-order harmonics that they can be used as the indication to detect the fault. The approach using proposed signal offers several advantages such as single-sensor requirement, non-invasive and less costly device.
