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Energy Measurement Design Center (EMDC): Support for THD, Exported Energy

Sean Lanigan
Prodigy 170 points
Other Parts Discussed in Thread: MSP430F67621A

Hi there,

I am currently evaluating EMDC (on an MSP430F67621A, as per this other question), and have a few general queries about the library and the values that it can provide (not hardware-specific, I know this specific chip isn't officially supported but these relate to EMDC itself and not the hardware).

Exported Power/Energy

It looks like EMDC only provides one number for accumulated energy readings (as per this reference) - previous example code seemed to provide two, one as a positive value for energy consumed from the grid, and one as a negative value for energy exported to the grid.

Am I overlooking something? Is there any way to tell how much power has been imported vs. exported in EMDC?

Total Harmonic Distortion

Some old power meter example code also provided THD. I'm not sure how accurate it would have been, but it at least had the option.

Will EMDC support THD at any point?

Thanks.

  • 0
    TI__Mastermind 49692 points
    Hello Sean,

    Thanks for your post and your continued interest in the Energy Measurement Design Center (EMDC).

    For determining exported power/energy, the EMDC code has been implemented to sum the absolute value of the energy, whether it's negative or positive. However, there are ways to detect the direction of the power/energy by looking at the sign of the active/reactive power, phase angle (power factor), etc. This could be implemented in the application code. I'll add it to the growing list of feature requests, including support for F67641A and F67621A.

    We've had several requests already for THD support (which is exiting), and we've added it to the list of future features. Right now, we're prioritizing all these requests to eventually implement the top requests. I'll keep you posted although it may be longer than 6 months before we decide on those new features.

    Regards,

    James

    MSP Customer Applications
  • 0 in reply to James Evans
    Prodigy 170 points
    Thanks James,

    Noted. Please do let me know when a new release is available.

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