AccuSine PCS+/PCSn: Can we install PCS+ and PCSn in the same parallel system?

[NguyenMon]

Hi everyone,

Have a nice day.

We have a customer who had installed 2 PCS+ units for mitigating 3-phase harmonics before and now they want to install 2 PCSn units to mitigate neutral harmonic. Can we install 2 PCSn units to the 2 PCS+ system in parallel? I demonstrate the system we're about to build in the picture below. Please look into it and give me some directions if anything needs correcting or notes in configuration.

Thank you in advance,

Nguyen

[Arunprasad]

@NguyenMon 

Hi

I need to check with my offer team, i will get back to you on this topic.

BR

Arun

[Arunprasad · Accepted solution]

@NguyenMon 

Here are our direction on your query, in addition to that,  i would appreciate if you can share below information in details.

What is the application? 

What is the customer name?

In which country you are planning for this set up?

Our Directions for PCSn and PCS+ operating in parallel on the same bus

The two AccuSine systems, PCS+ and PCSn will have to operate as independent system:

• The PCS+ will be programmed to for PF and harmonic correction, however we will disable (turn OFF) harmonic mitigation for all the zero sequence harmonics (3rd, 6th, 9th, 12th, 15th, …)
• The PCSn will only be programmed for harmonic mitigation and we will only enable (Turn ON) the zero sequence harmonics (3rd, 6th, 9th, 12th, 15th, …).

              We can use the existing CT’s for current sensing for the PCSn, simply daisy chain the CT signal       from the  PCS+ to the PCSn master unit, has shown in green.  In the drawing below, Consider the    third Master unit to be the first PCSn master unit (if multiple PCSn units are required).

There won’t be any Can bus communication between the PCS+ and the PCSn.

However, we will have Can Bus communication between each PCS+ or PCSn if multiple units of each kind is required.

Having a common breaker means no redundancy in maintenance or in case of a breaker trip.

Regarding neutral cable size , this would depend on how much Neutral harmonic is required, so I’d say size the neutral cable based on the neutral harmonic output/compensation.

BR

Arun

[NguyenMon]

Hi @Arunprasad ,

Have a nice day.

Thank you for your help.

We're planning to install this at outgoing low voltage for Noi Bai airport in Vietnam.
I'm sorry for wrong information i gave you in the topic. The purpose of this set up is to mitigate the 3rd harmonic which existing system (PCS+ system) couldn't mitigate efficiently.
So with this change, can your notes be usable now? Please give me notes if anything need changing.

I'm sorry for the inconvenience.

BR,

Nguyen