Temperature Derating; Mppt - Sungrow SG2500U-MV System Manual

System Manual
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.
-30
Ambient temp. T
T<-30℃
-30℃<T≤45℃
45℃<T≤50℃
50℃<T≤60℃
T>60℃
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.
P/Pn
1.2
1.1
1.0
Nominal value
0
Fig. 10-3 MV Station temperature derating function
Operation situation
The MV Station starts with the aid of auxiliary heater
Operate for a long time at 110% of the overload condition
Operate with derating at 2%Pn/℃
Operate with derating at 10%Pn /℃
Enter protection mode;
Automatically restart when temperature drops below 50℃
10 MV Station Functions
L1 = 2%Pn/℃
L2 = 10%Pn/℃
Temperature (℃)
45 50 60
71