in simulation 2 DGs are same and another one is different in rating power and droop coefficients, but each 3 DGs share same active power.
the controller of DG inverters are divided into 3 parts, power controller, current and voltage controller. my sys can control voltage and frequency(primary control) but load sharing isn't done correctly. where is my mistake?
Dear Parisa, I think that you are using Droop control? and the voltage and the frequency are ok. Check the droop characteristics of your DGs.
With only 3 DG's is there no phase frequency reference for droop control in the network?
How is shared network active load measured without some primary frequency reference?
Dear Dean, in the power controller, the magnitude and frequency of the inverter output voltage are set and each inverter uses an individual frequency reference. your mean is my mistake is related to frequency reference?
you do not have an infinite sink (grid) so without a common frequency reference and common total load sense feedback , how can you have stable sharing equal with dynamic load?
I would expect aliasing between DG and unstable sharing without a common f reference. e.g. GPS clock.
EE since 1975
Mr Dean, i do not know how to model common f reference and common total load feedbak in the simulation? i had studied about common f reference but i do not know to model it in Matlab please help me more. Thanks
Ms. Parisa,
How do you calculate share without knowing the total load?
I don't know how to simulate in Matlab. But I know how to generate a synchronous frequency reference.
Dear Dean, i do not calculate share, when one DG is different in droop coefficients so it should share different active power because the frequency deviation in all sys is same and only the same DGs have same active power, but in my simulation 3 DGs have same active power that is wrong. my mistake is in droop characteristics but i do not know what it is. load sharing is stable but it is not correct. in droop control there is a trade off between load sharing and voltage regulation.
Hi Parisa,
here you are the control strategies and their models simulation in these two references
hope this helps you
Y. Abueldahab
Parisa, i am sorry!
this night i see your problem and i think one answer for you, ok
;) .
Dear Valeriano, Thanks for your attention. but about load sharing i could find my mistake. i had a little mistake in droop characteristic. Thanks:))))
Hi Parisa,
I read almost your question about droop controller for island microgrid. It's very helpful to me. I start to study about microgrid.
The first step, I want to build 2 DG with droop controller in island mode with Matlab/Simulink. From the simulation file, I think I can verify and understand droop controller in island mode.
Can you share me your droop control simulation file ?
Thank you so much.
Hi Huy,
Please send me your e-mail addresse to send the file,here i cant attached it
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