How to write a 4-terminal MMC-HVDC model( I have already written 1 termianl)

Gloria.Z
1 ●11 ●13 ●13

Hello Everyone, Could you please help me? How to write a 4-terminal MMC-HVDC model( I have already written 1 termianl) I don't know how to connect the four terminals. and get the Udc. I wrote the 1 terminal as a generator. for two temainals or more how to get the MCs and the IBs IBrec = NUMTRM(MCrec) // IBinv = NUMTRM(MCinv)

answered Jun 10 '19

jfconroy
176 ●11 ●14 ●18

I have seen user-written models for VSC-HVDC being written as a model that sets the current injection of 2 generators in the network, with all of the HVDC equations being internal to the model. I also recall that that model was quite tricky to initialize. You could write your 4-terminal HVDC model in a similar way, setting the current injection of 4 generators. Of course, the bus numbers and IDs of the generators would need to be CONs and ICONs for this model.

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@jfconroy Thank you. And how to get the P Q U and I for each generator?

Gloria.Z (Jun 10 '19)

You will have to set them yourself in your power flow calculation. Then you will have to define the necessary equations in the dynamic model.

jfconroy (Jun 12 '19)

@jfconroy OK. I have set them in the power flow calculation. And define a Equivalent capacitor，How about the connection between the dc voltage at each terminal? Could you please give me your email adress and I'll email my code to you.

Gloria.Z (Jun 16 '19)

Unfortunately I am not available to provide detailed technical support, merely advice. There will be no dc voltages in your power flow calculations. The dc voltages should be state variables in the equations of your dynamic model.

jfconroy (Jun 17 '19)

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How to write a 4-terminal MMC-HVDC model( I have already written 1 termianl)

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