Why do these two measurement blocks produce different readings from the same magnitude?

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Juan Antonio Cabeza López de Tamayo 2020-6-21

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https://ww2.mathworks.cn/matlabcentral/answers/552424-why-do-these-two-measurement-blocks-produce-different-readings-from-the-same-magnitude

关闭： MATLAB Answer Bot 2021-8-20

200613 Query on cvtr voltage_2.zip

Good night all,

As you can see, the original power_PWMGenerator3Level file includes measurements of converter output voltage Va by means of a voltage measurement block,

If a compare the lecture of Va measurement block to that of said Three-Phase VI Measurement block, I note that the earlier is a square wave while the latter rather resembles a sinusoidal wave.

Both measurement blocks are set to register the phase-to-ground so they actually should show the same waveform. The only difference I note is that while Va measurement block is comparing phase Va voltage to node 10 voltage, the 3-Phase VI measurement block is comparing phase Va voltage to ground – could you please revise and provide with an explanation?

Thanks in advance and BR!

Juan