How can I solve this block diagrams in order to represent as overall transfer function and also represent in state space model?How can I know the values of the parameters in the given block diagrams?I need to find higher order I.e more than 10th order transfer function of the large power system model.Could anyone share your ideas to get overall transfer function of the system?I am attached block diagrams of the different power system model.Please check it.
Appedix 2 in the following book describe the requirements in a simple and systematic steps,
Book Dynamic Security of Interconnected Electric Power Systems - ...
The solution to the top figure will depend on the controller that is used, PI or 2 dof PID.
The 2 lower systems include non-linear elements, hence you cannot get a Laplace transform transfer function model. You should be able to formulate a state space description though, albeit not in the classical linear form
dx/dt = Ax + Bu, y = Cx
but in the nonlinear form
dx/dt=f(x,u)
Hello ! Your system is nolinear, but if you know the input and the output, you can use [A,B,C,D]=linmod(‘name of your simulink model’).
Irryhl Mohammedi hello. What if my system has no input or output (Autonomous system) how could I get the abcd matrices ?
Adham Osama Ahmed: B, C, D matrices are empty for an autonomous system, i.e.
dx(t)/dt = A x(t)
for an LTI system
James Whidborne thank you sir for your response. I would like to know how to get system modes of an autonomous microgrid in matlab. I used the control system design app but it always requires specifying an input and output for the system which is not the case in my model so how could I get the A matrix in this case ? thanks
to get A matrix you already need to define your parameters and numerically linearize the model otherwise you need to obtain an analytical linearized model. In both cases you can use optimization's tools to define get your unknowns once you you have your inputs/outputs given.
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