Questions regarding the Park transformation block in Matlab & Simulink 2019a

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Himadri Basu
Himadri Basu 2019-9-4
回答： Sabin 2024-12-19
To test and simulate a voltage source inverter based microgrid, I required to use an abc to dq conversion in Simulink. I tried to connect the 3 phase voltage measurement as an input to Park transformation block with the d axis aligned with phase A and initial electrical angle being 0 rad.
Unfortunately, I do not why the dq output I get is sinusoidal instead of a dc constant value at the output. I realized that this dq0 output turns out to be identical to that of stationary 2 dimensional reference frame alpha-beta-0. I am using the trial version of the Simscape electrical products of Matlab 2019a. I redownloaded and reinstalled these products and the error still persists. Now I am confused of where I had been going wrong with the simulation. Any suggestions are greatly appreciated.
The simulation includes
1. a 3 phase source with phase to phase (Line) rms voltage 380/sqrt(2)
2. three phase VI measurement block with Vabc being the phase to ground voltage output
3. Vabc is connected to the abc input of park transformation block which has d axis aligned with phase A
4. initial angle theta is set to zero
4. scope is connected at dq0 output
5. powergui block
For better understanding the .slx file is attached below.

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回答（1 个）

Sabin
Sabin 2024-12-19
The problem is that you use constant angle=0. This is not correct. As you have a 60 Hz system you can compute the electrical angle by numerical integration and then use the angle in the Park transform. This way you will get the correct result.

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