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Because the numerous nonlinear components and fiber interfaces are used in Module Multiple Converter (MMC), the HIL test of MMC with detailed EMT model and the full-scale interface is hard to be implemented. In recent years, this existing disadvantage caused the MMC controller hardware and software difference between the HIL test and real project. In this paper, a detailed EMT model of hybrid MMC...
The modular multilevel converter (MMC) is currently the preferred converter topology for HVDC point-to-point links and the likely choice for future meshed HVDC grids. For breaker dimensioning or protection system design, thorough knowledge of the dc fault currents supplied by these converters is required. In this paper, the dc fault current supplied by the half-bridge MMC is analyzed and an equivalent...
A new IGBT (insulated gate bipolar transistor) model for simulation of complicated multi-IGBT circuits is presented. Based on the gate charge and discharge behaviors of IGBT, it piecewise models the turn-on and -off transient of IGBT, and simulates the static characteristics with curve fitting method. With the key features of high simulation speed, easy parameters extraction and clear physical meaning,...
During Short-Circuit (SC) operations, strong current oscillations of IGBTs can appear. Simulation studies also confirm this. No parasitic inductances are required for such oscillations. A simplified equivalent circuit of the device, which is basically an RC oscillator, is able to reproduce the oscillations. The occurrence of oscillations depends on the model parameters, which can be related to the...
AC motor drives contain several power bus structures, which include the DC bus structure between the capacitor bank and inverter, IGBT power module internal bus structure to parallel several chips to obtain high current rating, and bus structures between low power AC drive units that are paralleled to obtain a high power AC drive. It is necessary to model these bus structures to perform circuit simulations...
The high intensity pulsed electric field is one of the promising technique for the liquid foods sterilization and the pulse-generating circuit is the most critical part. The objective of this research is to obtain the pulse circuit that is more energy efficient and higher sterilization ratio for the liquid food sterilization. Through analyzing several circuits and calculating the equivalent circuit...
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