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From: "Carlos E.R." <robin_listas@es.invalid>
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Date: Thu, 10 Jul 2025 02:27:53 +0200
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On 2025-07-09 23:49, Glen Walpert wrote:
> On Wed, 9 Jul 2025 23:07:26 +0200, Carlos E.R. wrote:
>> On 2025-07-09 22:57, Joe Gwinn wrote:


....
>>>> <https://elperiodicodelaenergia.com/el-gobierno-aprueba-la-
> instalacion-de-compensadores-sincronos-y-refuerza-la-interconexion-con-
> francia/>

....

>>>> Translated with DeepL.com (free version)
>>>>
>>>> ... You can read the rest on the link if desired.
>>>
>>> I did.  Thanks.
>>>
>>> What exactly do they mean by "Synchronous Compensators"?
>>
>> I don't know, I'm not an electrical engineer. But one of the comments
>> may explain a bit:
>>
>> Frank
>>
>> 07/08/2025 Synchronous compensators are reverse generators acting as
>> motors connected to the grid. What follows is simulations to determine
>> where on the grid they are most effective, power and costs because like
>> all motors they take active power from the grid which is priced on an
>> hourly basis. And the last thing is who will pay for the voltage control
>> service and how the installed equipment will be accounted for.
> 
> Synchronous Compensators are also known as Rotary Capacitors, they are
> unloaded synchronous motors which, like synchronous generators, will
> deliver reactive power (same as a capacitor) when overexcited, and consume
> reactive power when underexcited (like an inductor).  They have been in
> common use since the early days of power distribution to produce reactive
> power near loads, to reduce the amount remote generation needs to send
> over transmission lines, with the attendant losses.  Regular capacitors
> are also used for this purpose, but the rotary type is continuously
> adjustable.

<https://en.wikipedia.org/wiki/Synchronous_condenser>

Synchronous condenser

In electrical engineering, a synchronous condenser (sometimes called a 
syncon, synchronous capacitor or synchronous compensator) is a 
DC-excited synchronous motor, whose shaft is not connected to anything 
but spins freely.[1] Its purpose is not to convert electric power to 
mechanical power or vice versa, but to adjust conditions on the three 
phase electric power transmission grid. Its field is controlled by a 
voltage regulator to either generate or absorb reactive power as needed 
to adjust the grid's voltage, or to improve power factor. The 
condenser’s installation and operation are identical to large electric 
motors and generators. (Some generators are actually designed to be able 
to operate as synchronous condensers with the prime mover disconnected[2]).

-- 
Cheers, Carlos.