Accusine Compensation, Harmonic and VAR Priority

[sesa190510_brid]

Dear Expert,

In one of our accusine project that already finish installation for more than 1 year, during visit, the customer ask us to activate the VAR compensation capability of the Accusine. FYI, they have 9 units trafo that have been installed Accusine PCS on each of them. with Accusine rating at 300A.

In some of the trafo the harmonic injected current is only about 180A from 300A unit. To maximize its benefit, customer ask to activate VAR compensation here

On the HMI, I set "priority" between VAR and harmonic compensation on 50% : 50% compensation and run smoothly.

Then, I start to wonder what is the meaning of "harmonic priority" here?

Is that mean ( in 300A unit) harmonic compensation is limited to 150A and another 150A goes to KVAR compensation?

thanks a lot in advance, to anybody who share.

Regards,

[Fabricio · Accepted solution]

Hi Yorga,

The Accusine PCS priority setting is only effective once the equipment reaches its maximum capacity. In other words, once it is providing the maximum power on harmonics correction (300A) and there is a need for power factor correction, based on the priority settings, the active filter will drop the harmonics current and start injecting current on the fundamental frequency to correct the power factor.

As an example, considering the priority is set to 80% for Harmonics, if the Harmonic current is 300A, and there is need for power factor correction, the harmonics filter will reduce the harmonic current to  ~240A and leave the rest of the capacity of the active filter for the fundamental frequency (the summation of Harmonic current and Fundamental current will not be 300A, It is a square root of the squares of the components).

One important point here is that based on the information above, the total current is the square root of the squares of harmonic and fundamental current. In order to have an even split of the active capacity you need to set the harmonics priority to 70%, this will bring the fundamental priority to ~70% as well.

Best regards,

Fabricio

[Thierry]

Yes, fully agree with Fabricio answer.

And it is said setting at 70% will provide you not only 150A for both functions but around 210A for Harmonics and 210A for Power Factor correction. A good setting point to get the best from AccuSIne units!

[sesa190510_brid · Accepted solution]

That's very clear, Fabricio.

Appreciate it.

Thank you very much