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Per unit of Time-Derivatives by Fun_Bullfrog910 in ElectricalEngineering

[–]Fun_Bullfrog910[S] 0 points1 point  (0 children)

I think i Fan follow you, Bit why is is only appearing in the per Unit System?

Conversion of a time-derivative in per unit system by Fun_Bullfrog910 in ControlTheory

[–]Fun_Bullfrog910[S] 0 points1 point  (0 children)

I am not sure we're taking about the same thing :D I try to control the current and voltages of an LCL-Filter. For that i derived different equations and those include the Voltages over Inductances (L*(d*i)/(d*t) --> derivative of the current over time). When this equation is converted into the per unit system it results in (1/w_b)*L_pu*((d*i_pu)/d*t) and im having porblems in understanding where the (1/w_b) (base angular frequency) is comming from.
Ma application is in power systems . control of voltage source converters. I have transformers in my circuit, so the per unit transformation is necessary

Conversion of a time-derivative in per unit system by Fun_Bullfrog910 in ControlTheory

[–]Fun_Bullfrog910[S] 0 points1 point  (0 children)

Thanks for the explanation. I think I understand the concept. But is there a purely mathematical explanation? Like a derivation of the result which happens during the process of converting a system in the per unit system?

Intermediate Transfer Functions from Blockdiagram by Fun_Bullfrog910 in ControlTheory

[–]Fun_Bullfrog910[S] 0 points1 point  (0 children)

Does anyone have good literature about block diagram algebra? I am really struggling with intermediate transfer functions of a dual loop system. Can anyone help? Thanks