System Manual
10 MV Station Functions
71
requirements document within the time specified in the local standards or regulations.
Sungrow
‟s MV Station meets the abovementioned requirements.
10.6
Temperature Derating
When the ambient temperature is below 45
℃
, the MV Station can operate at 110% of the
overload condition. When the temperature reaches 50
℃
, MV Station can keep the nominal
power output. When the temperature is above 60
℃
, MV Station enters into protection
mode.
Temperature (℃)
1.0
1.1
0
50
45
Nominal value
60
1.2
L1 = 2%Pn/℃
L2 = 10%Pn/℃
-30
P/Pn
Fig. 10-3
MV Station temperature derating function
Ambient temp. T
Operation situation
T<-30
℃
The MV Station starts with the aid of auxiliary heater
-30
℃
<T
≤
45
℃
Operate for a long time at 110% of the overload condition
45
℃
<T
≤
50
℃
Operate with derating at 2%Pn/
℃
50
℃
<T
≤
60
℃
Operate with derating at 10%Pn /
℃
T>60
℃
Enter protection mode;
Automatically restart when temperature drops below 50
℃
10.7
MPPT
Maximum Power Point Tracking (MPPT) is a technique that the MV Station uses to get the
maximum power from the PV arrays. PV arrays have a complex relationship between solar
irradiation, temperature and total resistance that produces a non-linear output efficiency
known as the I-V curve.
