This model allows using much larger time steps (typically 50 microseconds), thus allowing simulations of several seconds. This model does not represent harmonics, but the dynamics resulting from control system and power system interaction is preserved. In this type of model the IGBT Voltage-sourced converters (VSC) are represented by equivalent voltage sources generating the AC voltage averaged over one cycle of the switching frequency. The average model (discrete) such as the one presented in the power_wind_dfig_avg model in the Renewable Energy examples library. This model is well suited for observing harmonics and control system dynamic performance over relatively short periods of times (typically hundreds of milliseconds to one second). In order to achieve an acceptable accuracy with the 1620 Hz and 2700 Hz switching frequencies used in this example, the model must be discretized at a relatively small time step (5 microseconds). The detailed model includes detailed representation of power electronic IGBT converters. The detailed model (discrete) such as the one presented in this example. Depending on the range of frequencies to be represented, three simulation methods are currently available in Specialized Power Systems to model VSC based energy conversion systems connected on power grids.
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