wind generartor turbiner on grid system 50kw

1、 Functional characteristics of variable pitch Wind Turbine

1.1 Technical advantages of variable pitch

At present, the pitch control mechanism of wind turbine is basically divided into electric control pitch control and centrifugal force pitch control.

The electronically controlled pitch mode is passive pitch, with a controller system to detect the voltage and current of the generator, and motor, hydraulic, push rod and other equipment to achieve the purpose of blade pitch. The design of the pitch mechanism is complex, so the cost is relatively high. Due to the complexity of mechanical design, the failure rate is also high in the process of operation.

Centrifugal force pitch is to install an iron flying rod at the root of the blade and use the centrifugal force generated by the impeller speed to change the blade angle. This structure is pure mechanical action pitch. Centrifugal force pitch can only be used for high-speed wind turbines. Generally, low-speed wind turbines are not conducive to the system. Moreover, centrifugal force pitch is a reverse propeller pitch mode, and the variation angle is very small.

Our company excludes the above two pitch structures and adopts the generator power pitch technology: it is the best choice for the wind turbine pitch system at present. The pitch system uses the power value of the generator to change the blade angle. During the operation of the impeller, if the generator reaches the rated power, the pitch system is affected by the power of the generator, It can linearly change the propeller angle in real time to stabilize the generator output power within the rated range. The variable pitch mechanical structure and control are simple and reasonable. Therefore, the adoption of our original variable pitch technology will greatly reduce the equipment failure rate.

1.2 safety protection of variable pitch on unit operation

The safety protection of Wind Turbine Generator is not good. When it comes to strong wind, the impeller will rotate faster and faster, which will eventually lead to the burning of the generator. Once the generator is burned, the impeller will stop rotating. Our company has independently developed and launched variable pitch wind turbine generator system, which has been operating safely in the market for many years and operates well without burning accident. At the rated speed of the wind turbine, once the rated speed is exceeded during operation, the pitch will passively force the fan blade to pitch (pitch along the propeller mode) and adjust the speed, so as to achieve stable output power of the generator. At present, our company has launched a series of horizontal axis variable pitch wind turbines: 5kW, 15kw, 10kW, 20kW, 30kW, 50KW, 60kW and so on. Among them, 5kW two are upwind rudders with tail. Rudder specification: no leeward.

1.3 Features:

1. It adopts direct drive permanent magnet generator, high-efficiency rare earth material, and the shell is made of carbon steel.

2. The wind turbine has simple structure, the hub adopts mature variable pitch structure, no complex moving mechanical devices, and the failure rate is very low.

3. Six high-end transmission slip rings are used to conduct electricity without cable twisting.

4. The rotary vertical shaft has no rigid driving mechanism and only uses conventional bearings. This structure can easily eliminate the jitter and vibration caused by unstable air flow, which is conducive to improving the service life of wind turbine generator.

5. The efficiency of generator is more than 90%, and the utilization coefficient of wind energy is 42%.

6. Unique simple control mode, automatic windward, effectively improving the working efficiency of wind turbine; Make full use of the power of the permanent magnet generator and its own torque to control the blade pitch, so as to achieve the best state of power generation, and the annual power generation is increased by more than 30%.

7. With automatic electromagnetic unloading function.

8. The unique sealing structure is adopted to completely prevent moisture and dust.

50KW Wind Generator Power curve

2.1  50KW  wind turbine system main Spec.

2.1.1    wind generator

2.1.2  Wind On Grid Inverter

Performance characteristics

(1)       Main circuit is using  U.S. TI' DSP chip、Infineon IGBT modules、Infineon‘driver protection, grid-connected output part adopts isolation transformer, safe and reliable ;

(2)       Using SPWM pulse width modulation，pure sine wave output，automatically synchronized with the grid tracking，power factor close to 1.Low current harmonic content , pollution-free and non-shock to grid;

(3)       DC maximum power tracking technique (MPPT);

(4)       grid-connected inverters’ current closed loop control，control and regulate；

(5)       Dc voltage across a wide range of input，adapt to different circumstances demand；

(6)       Frequency disturbance the technical，to achieve control of anti-island;

(7)       A comprehensive power to protect and improve yourself and protect the function。In case of system failure to stop the grid-connected invert ion ;

(8)       Circuit frame compact, ax. Efficiency≥94%;

(9)       Protection class up to IP20 ;

(10)    Optional RS 485 communication，Upper machine monitoring， achieve the remote data collection and monitoring ;

50kw wind On Grid Inverter main Spec.

Technical parameters

2.1.3  18m wind turbine independent tower

The anti-corrosion treatment of tower adopts hot galvanizing:

Hot dip galvanizing: hot dip galvanizing, thickness: the average thickness is greater than 70 microns.

Specific process: immerse the derusted steel parts into the molten zinc at about 500 ℃, so that the zinc layer is attached to the surface of the steel members, so as to achieve the purpose of anti-corrosion. Hot dip galvanizing process flow: pickling of finished products - water washing - adding auxiliary plating solution - drying - cooling - medicating - Cleaning - grinding - completion of hot dip galvanizing.