Dzhankeldy Wind Power Project

G
RID 
C
ONNECTION 
 
Each wind turbine will be provided with one transformer to connect with grid. The power 
transmission circuit will be connected with the low voltage side of transformers via a main 
switch for incoming line and directly buried cables. During the start-up and grid connection 
process of the wind turbine, the wind direction sensor will detect the wind direction and 
enables the yaw controller to actuate, aligning the wind turbine with wind direction. When 
wind speed exceeds cut-in wind speed, the wind turbine output voltage is adjusted to the 
value of grid voltage and the system frequency is made suitable for grid connection through 
the control of full power converter. At the same time, the phase difference between grid 
voltage and generator's terminal voltage is measured. When such difference becomes zero 
(zero crossing point), the power element of the converter, operates to achieve grid 
connection (all these actions in EN171.6.5 wind turbine can be realized through converter 
system). 
Other components of the wind turbine will include: 
 
Lightning protection and grounding; 
 
Environmental control system; 
 
Monitoring system;
 
Automatic fire protection system; 
A brief technical information of the selected turbine is provided in the table below. 
 

---

Dzhankeldy 500MW Wind Farm 
ESIA Volume 2- Main Text, Tables & Figures 
58 
Table 2-8 Brief Technical Information of Selected Turbine 
I
TEM
 
U
NIT
 
E
NVISION 
171
 
6.5MW 
Basic data of Wind Turbine 
Manufacturer/model 
Envision EN 171/6.5 
Rated Power 
kW 
6500 
Rotor Diameter 
m 
171 
Hub Height 
m 
100
Cut-in Wind Speed (10 minutes) 
m/s 
3 
Rated Wind Speed (10 minutes) 
m/s 
12.8 
Cut-out Wind Speed 
m/s 
25 
Maximum Wind Speed (10min 
average) 
m/s 
42.5 
Operating Temperature Range 
o
C 
Normal atmospheric temperature wind turbine
：-10°C to 40°C 
Survival Temperature Range 
o
C
-20°C to 50°C 
Design Service Life 
Year 
20 
Blade 
Number of blades 
- 
3 
Blade length 
m 
83.9 
Weight 
t 
20.5 
Blade Material 
Glass fiber reinforced polymer (GFRP) 
Blade Processing Technology 
- 
Vacuum infusion 
Blade Root Connection 
- 
Metal flange 
Swept Area of Rotor 
m
2
22965 
Pitch System 
Pitch control 
- 
Electric pitch control 
Pitch range 
- 
-5
o
~ 90
o
Type of backup power supply for 
pitch control 
- 
Supercapacitor 
Maximum speed of pitch motor 
rpm 
2500 
Type of pitch motor 
- 
AC Permanent Magnet Synchro (PMS) 
Pitch lubrication 
- 
Automatic lubrication