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I have implemented TRMS measurement for 3 Phase 4 wire system( using MSP430F5325) for all the voltages, currents, frequency ,active power , reactive power,apparent power, Power factor ,phase angle. I am sampling the ADC channels (3 for Voltage+3 For current) every 625 usec per cycle (Frequency 45 to 65 Hz ) but this rate is fixed and does not change with input frequency.
Samples are acquired every 625 usec , they are squared and accumulated in the ADC interrupt ISR.
After acquiring 2000 samples for each ADC channel, the ADC acquistion is stopped . After this, in the main function, we process the accumulated squared values for calculating the TRMS.Again the ADC acquistion is activated for next 2000 samples.
This is fine and working without any problem.
Now, I want to go for THD and individual odd harmonics measurement in the same hardware.
Using MSP430F5325 is it possible to measure THD of Voltage and THD of Current as well as individual odd harmonics (3 to 15th) in 3 Phase 4 wire system as MSP430F does not have DSP engine? However, it does have32 bit hardware multiplier which supports MAC function.
Can anybody suggest algorithm for calculating THD and individual odd harmonics for MSP430F?
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