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How to Control the Reactive Power from PV Inverter

08/14/2017 11:37 AM

How to control the reactive power from Photovoltaic inverter. How much grid connected PV inverter can supply or absorb reactive power for voltage improvement.

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Guru

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#1

Re: How to control the reactive power from PV inverter

08/14/2017 11:47 AM

Here's an article....

"Reactive Power Control in Utility-Scale PV...

...Utility Requirements and PV Inverter Capabilities"...

http://solarprofessional.com/articles/design-installation/reactive-power-control-in-utility-scale-pv#.WZHFFFGGOUk

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#2

Re: How to Control the Reactive Power from PV Inverter

08/14/2017 3:20 PM

What size inverter are we talking about here? I don't think small home-scale inverters have this feature.

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#3

Re: How to Control the Reactive Power from PV Inverter

08/15/2017 2:59 AM

Simple. Match the source impedance to the load impedance.

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#6
In reply to #3

Re: How to Control the Reactive Power from PV Inverter

08/16/2017 12:08 PM

Not so simple. Impedance matching is essential for transmission lines carrying RF energy, but it is rarely attempted/achieved in the 50/60Hz power grid.

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#4

Re: How to Control the Reactive Power from PV Inverter

08/15/2017 4:43 AM

Same as with everything else. All you need to do is design a regulator for the Q value of the current (low-right in the picture).

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#5

Re: How to Control the Reactive Power from PV Inverter

08/16/2017 12:01 PM

Generally speaking, you can't, unless the inverters are specifically designed to be controllable sources/sinks for reactive power. Look at the Utility Grid Codes for the location where the inverters are installed to see if there are any requirements for reactive power control in grid-connected PV systems.

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