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nuflia

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  1. Any circuit contains active components is non-linear, as an example power switches like semiconductors are no-linear, let say dc-dc converter is a nonlinear because it has IGBT power switches to transfer the energy between the circuits, transistors are another type of active components so when they are placed in the circuit, they make it exhibit non-linear behaviour, diodes sometimes are considered non-linear, The circuits that contains passive components like resistors, inductors and capacitors are considered linear So to make it easy if you see the V-I characteristics, so you can figure out if the component is linear or non linear Hope this has helped
  2. I’m doing a hybrid power generation project, a part of my work is a bi-directional dc-dc converter that charges and discharges a battery to keep the dc-bus voltage constant 380-420, the battery is 96vdc, I’ve made the Simulink model that works well, the problem is that my bi-directional dc-dc converter does not keep the voltage stable, i know it is due to the modeling of dc-dc converter that I am not able to design the optimum and best PI controllers( voltage and current controllers) I appreciate any idea or recommendation on how to model the bi-directional dc-dc converter to find the suitable TF and then design the current and voltage controllers that will charge / discharge the battery to keep the DC-bus volatge stable
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