Low Voltage Ride Through (Lvrt) - Sungrow SG4950HV-MV System Manual

System Manual
step 5 If Pf is selected, the power factor can be set in the "Run-information" sub-menu;
if "Q-limit" is selected, the "Q-limit (%)" can be set in the "Run-information"
•
sub-menu.
if "QU mode" is selected, QU-related parameter can be set on the running parameter
•
interface, where the parameter name begins with "QU", for example, QU operation
mode.
- - - - E E n n d d
Improper parameter configuration may affect the normal operation of the MV
Station!
Only authorized personnel can configure these parameters.
Should any question or doubt occurs, contact Sungrow.

10.5 Low Voltage Ride Through (LVRT)

T T e e c c h h n n i i c c a a l l R R e e q q u u i i r r e e m m e e n n t t s s f f o o r r C C o o n n n n e e c c t t i i n n g g P P h h o o t t o o v v o o l l t t a a i i c c P P o o w w e e r r S S t t a a t t i i o o n n t t o o P P o o w w e e r r
S S y y s s t t e e m m requires medium-and-large PV plant should be equipped with Low Voltage
Ride Through (LVRT) ability.
LVRT requires: PV plant can operate normally within certain voltage drop range and
duration when the voltage of the grid-connected point drops due to the power system
failure or disturbance; PV plant can provide the dynamic reactive power support during
the period.
A A c c t t i i v v e e P P o o w w e e r r R R e e c c o o v v e e r r y y
If the power station still connects to the grid during power system failure, the active
power will recover from the moment the fault is removed at the speed of at least 30%
nominal power/second.
D D y y n n a a m m i i c c R R e e a a c c t t i i v v e e C C u u r r r r e e n n t t S S u u p p p p o o r r t t
During LVRT, power station should feed reactive current to the power system as per
requirements. For a station whose 500kV or 750kV voltage is stepped up from the
220kV or 330kV voltage and then connects to the power station group, it should feed
reactive current to the grid when a short-circuit occurs and the voltage drops.
Z Z e e r r o o V V o o l l t t a a g g e e R R i i d d e e T T h h r r o o u u g g h h
When the grid-connection point voltage drops to zero, power station can operation
normally for 0.25 second.
Note: U is the grid-connection point voltage; Upu is the grid-connection point nominal
T
voltage.
10 Main Functions
69