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This work proposes to control the flux linkage of the dynamic voltage restorer (DVR) transformers through a proper correction in the voltage injections. The flux-linkages are calculated by means of the voltages in the transformers that are injected by the DVR. In case of exceeding the maximum flux saturation, a form factor is determined and the voltage injected is modified within a half cycle and...
In this paper, the behavior in radiated mode of an EMI filter used in speed drives is analyzed. It was identified as one of the main sources of magnetic near field radiation. On one hand, the EMI filter is located upstream from the speed drive and is the victim of the other radiation sources of the speed drive. On the other hand, these sources excite its parasitic elements and create new resonance...
In this paper, we analyzed the behavior of a three phased inverter used in speed drives in radiated mode and we modeled it by equivalent diagrams representing electric operation and including parasitic elements. First, we tried to link the amplitude spectra of the radiated magnetic field and the electrical time measurements (currents). Then, under some assumptions, we proposed a modelling of the main...
This paper deals with a study whose goal is to find new solutions that could reduce EMI filter weight in future aerospace applications. A conducted EMI comparison between different inverter architectures and controls is presented. It uses simulated results based on accurate high frequency models.
Power electronic converters based on piezoelectric transformer (PT) have been widely adopted in recent years due to their many inherent advantages such as safety, low housing profile and high power density. However, few studies have been conducted about noises emitted by PT converters. In this paper, we study conducted EMI problems in a 10 W, DC-DC PT converter. The different sources and specific...
In order to efficiently reduce electromagnetic interference emissions, especially common-mode (CM)-conducted noise emissions, which are the most disturbing in any variable-speed drive systems, the understanding of behavior and the knowledge of propagation path of parasitic currents in the system are essential. In this paper, a simple CM disturbances modeling is proposed to predict or estimate the...
In order to efficiently reduce EMI emissions, especially common mode (CM) conducted noise emissions that are the most disturbing in any adjustable-speed drive systems, behaviour understanding and propagation path knowing of parasitic currents in the system are indispensable. In this paper, a simple CM disturbances modelling is proposed to estimate or calculate the CM noise currents. The modelling...
In high power high voltage conversion, the technology of IGBT's drivers is a very sensitive point due to the need of a high reliability and a high degree of insulation to transmit driving information and energy to the gate driver. Many techniques exist that allow an insulated transmission of the driving signal. Some, like the level-shifter or the optocoupler are commonly used in medium voltage range...
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