Three Phase Wireless smart energy meter using ADE7754 chip

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Naveed Ahmed

Joined: 31 Aug 2008
Posts: 21
Location: Pakistan

31 Oct 2009 12:30 Three Phase Wireless smart energy meter using ADE7754 chip

Hello dears!

I have designed three phase wireless energy meter using ADE7754 chip. I have calculated all the parameters voltages, currents, active power, apparent power, active energy, apparent energy, frequencies, power factor etc.

But ADE7754 has limitation that it does not calculate Reactive power. There is a method of getting reactive power sign in this chip but it is not working properly.

If i get the sign of reactive power that will help me to calculate the reactive power using power triangle method.

Can we find the sign of reactive power using this IC???

Thanks in advance.

Regards
Naveed Khowaja

bobcat1

Joined: 10 Jul 2002
Posts: 1118
Helped: 48

31 Oct 2009 13:57 Re: Three Phase Wireless smart energy meter using ADE7754 ch

HI

I n order to get accurate measurement from this IC you will need to calibrate it

Other wise you will get false result - folow the ADE7xxx application note to learn how to calibrate the it.

To get reactive measurement - you will need to do calculation in the host processor
And to use floating point calculation (depend on the processor used) or to convert the calculation to integers (a bit of a hard work)

All the best

Bobi

The microcontroller specialist

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Naveed Ahmed

Joined: 31 Aug 2008
Posts: 21
Location: Pakistan

31 Oct 2009 15:36 Re: Three Phase Wireless smart energy meter using ADE7754 ch

Thanks for interest Bobi!

Yes! for calibration I am referring AN624 application note, and for floating point conversions I am using IEEE754 standard of 4 bytes.

As much as Reactive power is concerned, it can be found as

Reactive power= (sign of Reactive power)* √(Apparent power)²-(Active power)²

But the problem is to get the sign, or to know about the load whether it is inductive or capacitive. to know about the phase shift whether it is positive or negative.

??

Thanks

Regards
Naveed Khowaja