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Large IGBT modules often consist of many IGBTs connected in parallel in order to achieve high current ratings. In the ideal case, current is shared equally between these IGBTs. However, in real power modules parasitic oscillations between the IGBTs can occur, which can lead to EMC issues or even damage the power module. In this paper, two different oscillation circuits are presented which have been...
Three-phase converter systems can be prone to negative impedance instability of the DC-bus. This paper studies the dynamic interactions between the DC- and AC-sides of a current-controlled three-phase system in order to reveal possible risks of instability. The system is modelled by using a small-signal method from a viewpoint of the DC-side. Time delays due to pre-calculation and discretization are...
This paper covers the modelling of the standard IEEE 14 bus system using the MATLAB package. The basic system is tested under large and small disturbances to study the dynamic behaviour of the system and the stability margins associated with the different configurations of the system. As a suggested solution to increase stability margins of the system, Sen transformer is added, modelled and tested...
This paper introduces the integration of communication modelling into design modelling during the early stages of system development. It presents the modelling of flocking behaviour system in SystemC, which is emerging as a suitable language for designing and modelling. SystemC provides a consistent methodology for the design and refinement of complex digital systems. In this paper, a demonstrator...
The current SystemC modelling language lacks a standard framework that supports the modelling of wireless communication systems. This research investigates how wireless features can be incorporated into existing SystemC design methodology. The components to be investigated in order to achieve this target are divided into three parts: developing a system-level model of a digital wireless communication...
Due to the ignorance of the instability of hydraulic cartridge sequence valve and the resulting accidents, this paper presents stability analysis of the cartridge sequence valve. First, the operation of the valve was illustrated, then a theoretical analysis was given, and simulation under AMESim environment was carried out, hence the variations of the control variables during the dynamic process were...
This paper presents a comprehensive assessment of small-signal stability for a ldquomore-electricrdquo aircraft power system consisting of a synchronous variable-frequency generator which supplies several power electronic controlled loads via an 18-pulse autotransformer rectifier unit (ATRU) for AC-DC conversion. Functional models for key power system components and loads are derived. Numerical tools...
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