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So lately I've been trying to get a grapple on PSCAD to begin some research and I was given a simple 6 bus system with some solutions on the fault analysis for a 3 phase and single phase-ground fault. I worked through and developed a matlab code that MATCHES the solution given (1412<-81.5 Amps).

But when I develop the system in PSCAD and simulate the fault I cannot get the fault to match up.

I keep getting around 2160<-69.4 Amps.

I've gotten the powerflow to match up within a few percent of the actual power flow. I've triple checked or more all of my impedances.

Here are some pictures of the system.

I've been scratching my head for weeks now. I've triple checked everything and I can't for the life of me figure out why it's not matching up. My line impedances are correct. My generator and Transformer impedances are correct. My load flow is matching up. I've been throwing solutions at a wall to see if anything sticks but I can't get anything to give me the solution I want. So I've come here to hopefully get some help. I've attached my PSCAD file as well as the load flow and fault analysis solutions.

Part 1 results are the load flow solutions. Part 2 results are the fault analysis solutions.

If you have any further questions or suggestions please feel free to ask/comment.

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Open Aug 26, 2019 - 01:24 PM

PSCAD, 6 bus, Single Line to Ground

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Hi there,

I think your issue comes form load model. "For a static load model, the power relationship to voltage and

frequency is an exponential equation." see equation (1) and (2) in this reference "A Novel Approach to Solve Power Flow for Islanded Microgrids Using Modified Newton Raphson With Droop Control of DG"

Hope this will help you.

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I have all of those parameters set to zero in the PSCAD model which essentially makes the equations:

PLk=PLk0

QLk=QLk0

So the load should equal what I have placed.

By

Dear there,

Try to modify it. Because you don’t know how matlab was model it’s load.

Also, you should know that at bus #1 the angle should be zero, so you should eliminate the value of the bus#1 from others bus in order to get zero degree at slack bus.

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