FPL presentation (Danish).pptx

7/25/2019 FPL presentation (Danish).pptx

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Capacitor Bank Operations

What is capacitor bank?

What is their purpose?Where they are used?Why they are used?How to control Capacitor banksWhy we need to install capacitor banks in our

system

Where to install a capacitor bank for a particular PVsystem?

What are the measures of their protection?


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CAPACITOR BANK

A capacitor bank is a grouping of several identical capacitors interconnected in p

with one another.

PURPOSE

To achieve an effective voltage management for all feeders

capacitor banks are used. There are other methods as well

that can be used for effective voltage management such as

On-load tap changer (OLTC)-fitted transformers shunt

reactors etc. !ut the capacitor bank technolog" is the

cheapest one

Where They Are Used

The" are widel" used around the world predominantl" in medium voltage (#$)


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WHY THEY ARE USE

There are several reasons that %ustif" their adoption i.e.

To increase voltage where the load is highl" inductive& To improve voltage regulation b" ade'uatel" switching capacitors& To reduce losses due to reduced active and reactive currentspower flows& an To release k$A capacit" of the substation and hence defer reinforcements. !ut the" are mainl" used b" industrial customers for power factor correction

Ho! to contro" Capacitor #anks

Capacitor banks can be controlled b" different control mode including current-b

control voltage-based control $A control power factor-based control and tim

control.


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$o"ta%e Based Contro"

Voltae based control is used to reulate !oltae pro"les# Voltae control re$current sensors#

%he capacitor is switched &'when the !oltae is lower thanthe pre(set )switch(on* !alueand is switched &++ when the!oltae is hiher than the pre(set )switch(o,* !alue# %hesepre(set !alues ha!e certaintime delays at both ends#

Capacitor

s!itch on


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Ho! To Assess 'a(i)*)P$ Penetration

The ma*imum +$ penetration anetwork can host without causing an"

voltage or thermal issues will be

carried out b" #onte Carlo-based

three-phase power flow anal"ses.

The +$ penetration is defined as the

percentage of houses with +$s"stems from the total number of

houses in the network.


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Why !e need to insta"" capacitor #anks in o*r

Point onfeeder 5where

Capacitor is

connected

Witho*t Capacitors With Capacito


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Where To Insta"" Capacitor #anks +,-

Installed power of PV

plant versus Leading

Installed power of

versus reactive powe


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Where To Insta"" Capacitor #anks +.-

Capacitor bank isconnected so as not toincrease the amount ofreacti!e power ow inthe distribution system#

ts reacti!e power QC ise$ual to the reacti!epower Q absorbed by thePV in!erters whichmakes the net reacti!epower e$ual to ero#


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What/s Ne! 0 S'ART P$ IN$ERTERS

&!er -5 of the time a PV in!erter is runnin below its rated output cwhen con!ertin 6C solar power to 7C acti!e power#

%he unused capacity of the in!erter can then be put to use to produce

power# %he output of a smart PV in!erter has both reacti!e and acti!e 7C cur

add eometrically to the apparent power 8 +or the fre$uency to remain stable the enerated acti!e power must m

power demand at all times# %he reacti!e power capacity of a smart PV in!erter can be used as a fa

static V79 compensator and actin as either a shunted inductor or cap

decreasin or increasin the 7C !oltae alon the line# &n the distribution side: smart PV in!erters are used to correct the po

by pro!idin V79s close to where they are bein used: rather than impthem from far away

Not only can both power factor correction and AC volt

regulation be performed much more economically by

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FPL presentation (Danish).pptx