Abstract
Average switch simulation has the advantage of being much faster to simulate than the switching simulation but it lacks any harmonics or distortion on the converter current waveform. In a hardware converter, the current distortion is caused by the dead-time between high side and low side switching devices provided to avoid switch shoot-through. To improve the fidelity of average switch simulation, this paper provides a simple method to induce the distortion resulting from the dead-time. The result of average switch simulation can thus closely resemble the result of switching simulation in a fraction of the simulation time. To validate the accuracy of this average switch simulation, the result of this simulation is compared with the detail switching simulation and the waveform from actual hardware measurement.
Highlights
Medium-and-high-voltage power switches such as MOSFETs and IGBT, are used in a variety of converter applications
To simulate the dead-time effect by means of electromagnetic transient simulators such as PSCAD/EMTDCS or PSIM, the simulation time step needs to be much smaller than the dead-time to capture the distortions/non-idealities caused by the dead-time, leading to excessively long simulation times
PROPOSED ENHANCED TIME AVERAGE MODEL TAM-voltage source converter (VSC) simulation offers very fast simulation execution time, the use of all linear equation in place of switching networks combined with ideal duty cycle command by controller output (Dcmd) for the simulation resulting in an ideal waveform with zero harmonics/distortions
Summary
Medium-and-high-voltage power switches such as MOSFETs and IGBT, are used in a variety of converter applications. Ahmed et al [8] proposed an enhanced TAM of a VSC by calculating the effective duty cycle and applying the distortion using the definition from [7] and by modeling the voltage drop of diode and IGBT as error of duty cycle. Such a method neglects the distortion of effective duty cycle in the vicinity of current zero crossing being null. Eq 3 describes the mathematical definition of this phenomenon by using three levels based on I relative to the values of Ip and −Ip
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