RW-30kW variable pitch wind turbine

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TEST AND MEASUREMENT INSTRUMENTS C.C.E: [email protected] | M:(+27) 11 683 4365

www.instrumentsgroup.co.za

RW-30kW variable pitch wind turbine

2018

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1. RW-30kw variable pitch wind turbine parameter

1.1 RW-30kW parameter

RW-30kw variable pitch Technical parameters 13.5V

Wind rotor diameter (m) 13.5

Blade material and quantity Fiber glass reinforced * 3

Rated power / max power (w) 30k/35k

Rated wind speed (m/s) 10

Rated rotating speed (rpm) 90

Working wind speed (m/s) 3-30

Startup wind speed (m/s) 2.5

Survived wind speed (m/s) 60

Working voltage (v) DC240V(off grid) / DC400V(on

grid)AC240

Battery voltage / capcity (v, ah) 12*20=240V/200Ah

Speed regulation method Variable pitch regulation +

electromagnet brake + active yawing

Stop method Mechanical brake, aerodynamic brake

Generator type Three phase, permanent magnet

Gear box No, direct drive

Wind turbine weight (kg) 2600

Tower height / weight (m/kg) 25/4200

Max horizontal force (N) 27602

Wind turbine dimension D*L (m) 13.5*2.5

Noise level (dB) <65

Packaging info for transportation 5PKGS,7160kg, 28CBM



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2.1 RW-30kw output power curve

Wind speed (m/s) Output power (w)

2 172

3 850

4 2020

5 3956

6 6837

7 10856

8 16205

9 23050

10 31650

11 36500

12 36500

13 36500

14 36500

15 36500

16 36500

17 36500

18 36500

19 36500

>20 36500



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2.2 RW-30kw AEP

Annual wind speed (m/s) Electricity generated (kwh)

3 19554

3.5 30474

4 43584

4.5 58151

5 73418

5.5 88751

6 103684

6.5 117901

7 131195

7.5 143434

8 154540

8.5 164471

9 173212

9.5 180778

10 187199



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3. 30kW variable pitch wind turbine characteristics

3.1 30kW main parts introduction and characteristics：

No. Name No. Name

1 Blade sleeve 8 Supporting bracket

2 Nose cone 9 Main control box

3 Blade 10 Yawing motor

4 Generator 11 Supporting flange

5 Nacelle 12 Hydraulic station

6 Dogvane 13 Hydraulic brake

7 Anemometer 14 Nacelle cover

Wind turbine main configuration:

No. Main components

1 Blade

2 Variable pitch mechanism

3 Generator

4 Rotating support mechanism

5 ABS system



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6 Anemometer and dogvane

7 Yawing control and cable-release

mechanism

8 Hydraulic system and brake

3.2 Variable pitch technology

Variable pitch travel 45mm

Answer speed at rated wind speed of variable

pitch

t＜2s

Startup rotating speed of first-degree variable

pitch

30±10rpm

Startup rotating speed of second-degree variable

pitch

120±10rpm

Spring of variable pitch mechanism Over 100 million time service

life



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RENERGY variable pitch wind turbine is a patented product and pioneer in China.

The self-developed variable pitch mechanism of Wind turbine adjusts blade pitch

following wind rotor rotating speed and wind speed, and keep wind turbine at rated

rotating speed. The wind turbine has a stable output power and safe running and is

maintenance free.

3.3 Blade technology

Blade specification

Item 30kW

Blade length 5.8m

Blade weight 160kg

Material Reinforced fire-glass

Quantity 3 pieces

Weather-proof

treatment

US imports 3M protection film

Blade raw

material

US Ashland colophony

Gel coat US Ashland gel coat

Bond US imports Plexus

A.



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B. Blade strength

RENERGY blade was approval by Denmark professional testing institution; No

damage with 400KG pilling force for over 3 minutes.



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C. Blade protection

Leading edge protection finishing: reduce 10% wind rotor noise, good anti-corrosion

capability, prolong service life effectively.

D. Wind rotor balance debug regulation

Every set of blades will be tested as follow before leaving the factory

(1). Static balance check after assembling blade and hub

(2). Blade face runout check after assembling blade and hub

(3). Angle check after assembling blade and hub



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(4). Single blade gravitational moment check

3.4 Generator technology

Generator technology

Item 30kW

Rated voltage DC500V

Rated/maximum output power 30/35Kw

Stator external diameter 520mm

Generator shaft diameter 120mm

Generator weight 850kg

Outline dimension 650×650×700mm

Stator iron cone material Cold-rolled silicon steel sheet

Generator shaft material 40Cr



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A. Inner rotor design with good tightness. Level of protection: IP54

B. Radial tile-shaped permanent magnet rotor magnetic circuit structure: flux density

is 10-15% higher than traditional Tangential magnetic circuit.

C. Generator fractional slot winding: generator design adopts fractional slot winding;

lower output harmonic component of generator; lower waveform distortion; lower

startup resist moment. All of these make wind turbine startup with lower wind

speed.

D. Special electromagnetic load design: not only consider of generator capacity, but

also improve generator’s overload capacity by 1.5 times.

E. Larger cooling area: generator cooling area is over 2.5 times comparing with Stator

outer circumference area. The temperature rise is always lower than 85 degree with

long time running with 1.2 times to full output power.

F. Cold-rolled non-oriented silicon steel sheet: Lower generator iron loss

G. Independent design stator piece: more reasonable generator stator cell structure.

Lower current density

H. Higher fixed voltage adjustable rate: Fixed voltage adjustable rate is over 45%.

Lower cut-in wind speed; Easy for grid-connection inverter power design.

I. High structure strength: generator case can bear some damaged working condition

such as single blade fly out. 1.5 times safety ratio



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J. Permanent magnet direct-drive structure: no gear case, low failure rate.

3.5 Rotating supporting mechanism

(1) It adopts a special rotating system which is suitable for small and medium wind

turbine. Good stable ability for yawing.

(2) It adopts yawing brake mechanism. It helps gear box to avoid tired which be

caused by wind rotor pressure. This makes yawing mechanism have a longer service

life.

3.6 ABS system

3.6.1 Variable pitch brake system component

(1) Variable pitch wind rotor

(2) Brake mechanism

(3) Auto brake PLC controller

(4) Hydraulic system

(1) Variable pitch wind rotor

In brake system, variable pitch wind rotor change blade angle into negative angle,

remove wind pressure on wind rotor, and slow down wind rotor rotating speed, wind

rotor lose power.

Wind rotor



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Blade angle change direction

(2) Brake mechanism

After wind rotor lose power and slow down, brake mechanism will brake wind rotor

axis with disc brake, wind rotor stop rotating.



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(3) Auto brake PLC controller

Auto brake PLC controller detects wind speed, voltage, current, grid power state and

other signals, and control wind turbine brake or running.

PLC Controller



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3.6.2 Brake principle

Auto brake principle

(1) Over wind speed brake:

PLC controller detect wind speed, when wind speed is over 18m/s, PLC controller

send brake signal, brake relay close, brake mechanism start brake. When PLC

controller detects in position signal, stop braking.

(2) Over voltage brake:

PLC controller detects wind turbine controller voltage signal, when voltage is over

560VDC, PLC controller send brake signal, and brake mechanism start brake. When

PLC controller detects in position signal, stop braking.

(3) Over current brake:

PLC controller detects wind turbine output current signal, when current is over 45A,

PLC controller send brake signal, brake mechanism start brake. When PLC controller

detects in position signal, stop braking.

(4) Grid power failure brake:

PLC controller detects grid power signal, when there is a grid power failure, PLC

controller will send brake signal, brake wind turbine and send alarm signal.

(5) Brake release

After PLC controller finish brake, it will continue detect average wind speed in

45minutes, if wind speed is less than 12m/s, PLC will send brake release signal,

brake mechanism start to release brake. When PLC controller detect in position

signal, stop brake releasing.

3.6.3 Variable pitch brake process

(Take over wind speed as example to explain variable pitch brake process)

(1) Anemometer detects wind speed signal, and send wind speed signal to Auto

brake PLC controller,

(2) Auto brake PLC controller receives wind speed signal, and send brake signal out,

(3) Auto winch receive brake signal and start,

(4) Wind rotor blade angle change into negative angle by auto winch, wind rotor lose

power, rotating speed slow down,



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(5) Brake mechanism start, brake wind turbine

3.7 Anemometer and dogvane

Dogvane

Dogvane detects the real wind direction. When the PLC controller detects that the

wind turbine is diverged with main wind direction about ≥15° in continuous 2 minutes,

the control center will start up lift-yawing or right yawing to find the right wind direction.

When is test that the wind turbine faces to right wind direction, it stops yawing.

Anemometer



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3.8 Yawing control and cable-release function

3.8.1 Yawing brake

（1）When the PLC control center tests the immediately wind speed comes up to

25m/s, it will send yawing order to make wind turbine avoid wind direction about 90

degrees.

When PLC control center tests that variable pitch brake is failure, it will send order

to make wind turbine diverge wind direction about 90 degrees. This ensures wind

turbine safety.

3.8.2 Yawing cable-release

When the wind turbine runs for a long time, the cable may be twine because of the

long working time and wind direction changeable. When the yawing cable-release

inspection mechanism tests that wind turbine rotates 2 circumferences which is

calculative in one wind direction, it will rotate in negative direction.

Rotating mechanism

Numeration coder



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4. RW- 30kW features

4.1 Intelligent control

The main control center of 20kW / 30kW variable pitch wind turbine is an innovated

intelligent electrical system, admitting the best wind turbine control technology and

combing variable pitch wind turbine characteristics. The hardware was chose by the

best international supplier, running stable, strong anti-interference ability. The

software adopts redundancy control strategy to ensure system running safe and

reliable. System has strong extendibility; it can match with all kinds of famous brand

inverter and remote monitor module. It meet client's requirement of one-stop service.

4.1.1 Intelligent protection

15 redundancy safety protection measurements: Yawing brake protection for power

failure, such as over voltage, over current, over rotating speed, over temperature, low

pressure and so on; sensor failure protection for voltage, current, rotating speed, wind

speed, wind direction; system failure emergency brake protection for yawing and

variable pitch failure; protection for "inverter is out of net"; stop at over wind speed;

restart function as low wind speed and so on. All of these measurements ensure wind

turbine running safety and reliable.

4.1.2 Remote monitor

User can monitor the wind turbine system by internet or mobile net at real time. User

can learn wind turbine running station at first time.



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4.1.3 Active yawing

Find wind direction automatic

The dogvane can inspect wind direction at real time then ensure wind turbine finding

right wind direction intelligent. Finding wind intelligent strategy not only ensures the

output power, but also avoids yawing parts abrades because of finding wind direction

frequency.

4.1.4 Automatic untwisting

Double cable untwisting protection, ensures wind turbine's cable untwisting forever.

4.2 Leading STEP variable pitch technology world-wide

4.2.1 Leading technology

4.2.1.1 Exactly and softness regulation of variable pitch

Information input source of variable pitch is the wind rotor rotating speed, it make sure

the response quick and regulate softness



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4.2.1.2 Long service life design

System adopts mechanical part, floating connection, full range of lubrication

protection. Less system malfunctions and better environmental suitability.

4.2.2 Generate 30% electricity more than normal wind turbine

4.2.2.1 Lower start up wind speed

Double degree variable pitch mechanism ensures blade have an optimum startup

degree. Wind rotor can be started with 2m/s wind speed.

4.2.2.2 Stable running when wind speed is higher than rated wind speed

The blade angle is minus value under variable pitch when wind speed is over than

rated wind speed. It makes system have a stable rated output power.

4.3 Fail Safe design

In extremely conditions, if all protection failed, Unique Fail safe design of Renergy will

work, wind turbine blade will become feathering, wind turbine stop. The last fail safe

design will keep wind turbine safe in any cases.



RW-30kW variable pitch wind turbine

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