CN201425001Y - A 1.5MW permanent magnet direct drive wind turbine - Google Patents

Abstract

The utility model relates to a 1.5MW permanent magnet direct drive wind power generating set, which comprises a wind wheel, a permanent magnet low-speed synchronous generator, a controller and an inverter. The permanent magnet low-speed synchronous generator is connected with the inverter, and the controller is connected with the permanent magnet low-speed synchronous generator and the inverter. Compared with the prior art, the utility model has high reliability, low failure rate, high equipment utilization rate, strong environmental adaptability, high wind energy utilization rate, and the power factor of the unit can be adjusted, and the full power inverter can be connected to the grid.

Description

A 1.5MW permanent magnet direct drive wind turbine

technical field

The utility model relates to a wind power generator set, in particular to a 1.5MW permanent magnet direct drive wind power generator set.

Background technique

The wind rotor of the existing wind power generating set is usually connected with the generator through a gearbox, and the gearbox is easy to cause machine failure, low reliability, often needs to be shut down for maintenance, and the utilization rate of the equipment is not high; and the gearbox is generally equipped with rare Oil lubricating system, thin oil lubricating system is sensitive to ambient temperature, and it is also prone to machine failure, and its adaptability is not strong.

Contents of the invention

The technical problem to be solved by the utility model is to provide a 1.5MW permanent magnet direct-drive wind power generating set in order to overcome the above-mentioned defects in the prior art.

The purpose of the utility model can be achieved through the following technical solutions: a 1.5MW permanent magnet direct drive wind power generator set, is characterized in that it includes a wind wheel, a permanent magnet low-speed synchronous generator, a controller and an inverter, the described The wind wheel is connected to the permanent magnet low-speed synchronous generator, the permanent magnet low-speed synchronous generator is connected to the inverter, and the controller is connected to the permanent magnet low-speed synchronous generator and the inverter.

The permanent magnet low-speed synchronous generator includes a rotor and a stator, the rotor is coaxially connected with the wind wheel, and the stator is wound with three-phase winding coils.

The inverter is connected with the three-phase winding coils on the stator of the permanent magnet low-speed synchronous generator.

The wind wheel is a three-blade wind wheel.

The shaft of the permanent magnet low-speed synchronous generator rotor is a hollow shaft.

The permanent magnet low-speed synchronous generator is a rare earth permanent magnet synchronous generator with a rated power of 1.5MW and a working speed of 12-20r/min.

The three-phase winding coil is a continuous winding coil.

Compared with the prior art, the utility model has the following advantages:

1) High reliability, low failure rate and high equipment utilization:

The structure is simple, the wind rotor shaft directly drives the generator, there is no gearbox, and there is no slip ring of the doubly-fed machine, so the problems caused by the gearbox and rotor slip ring have been completely solved;

2) Strong environmental adaptability:

Since the utility model does not have a speed-increasing gearbox, it does not need a "thin oil lubrication system", so it has strong adaptability to high and low temperature environments;

3) High utilization rate of wind energy:

Compared with the permanent magnet direct drive unit and the doubly-fed asynchronous wind generator, the wind energy utilization coefficient CP value of the two is basically the same in the high wind speed area, while the CP value of the permanent magnet direct drive unit is higher in the low wind speed area; Compared with the asynchronous generator, the total power generation of the magnetic direct drive wind turbine can be increased by 10% to 20%; while the operating cost is 15% to 20% lower than that of the double-fed generator;

4) The power factor of the unit can be adjusted, and it can be connected to the grid with full power inverter.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, a 1.5MW permanent magnet direct drive wind power generator set includes a wind wheel 1, a permanent magnet low-speed synchronous generator 2, a controller 3 and an inverter 4, and the wind wheel 1 and the permanent magnet low-speed The synchronous generator 2 is connected by transmission, the permanent magnet low-speed synchronous generator 2 is connected with the inverter 4 , and the controller 3 is connected with the permanent magnet low-speed synchronous generator 2 and the inverter 4 .

The permanent magnet low-speed synchronous generator 2 includes a rotor and a stator, the rotor is coaxially connected with the wind wheel 1, and the stator is wound with three-phase winding coils; the inverter 4 is connected with the permanent magnet low-speed The three-phase winding coils on the stator of the synchronous generator are connected; the wind wheel 1 is a three-blade wind wheel; the shaft of the permanent magnet low-speed synchronous generator rotor is a hollow shaft; the permanent magnet low-speed synchronous generator 2 It is a rare earth permanent magnet synchronous generator with a rated power of 1.5MW and a working speed of 12-20r/min; the three-phase winding coil is a continuous winding coil.

The utility model is characterized by a three-blade horizontal shaft, a permanent magnet low-speed synchronous generator, no speed-increasing gearbox between the wind wheel and the generator, and the wind wheel shaft is directly connected to the permanent magnet low-speed synchronous generator with a rated speed of less than 30r/min The rotors are coaxially coupled. Fans adjust their power by changing the blade pitch angle.

The current generated by the three-phase winding coil of the stator of the wind power generator is converted into an output current with the same frequency, voltage and phase as the grid by the inverter and then fed into the grid.

The permanent magnet synchronous generator of the permanent magnet direct drive large-scale wind turbine is a low-speed generator, so the wind wheel shaft can be directly connected coaxially with the rare earth permanent magnet synchronous generator rotor with a maximum speed of only 20r/min, without the need for high-speed asynchronous The generator is also added to the speed-up gearbox. The rated power can be reached at the rated wind speed of 12m/s. The three-phase alternating current with a rated voltage of 690V is rectified by the controller, and then converted by the inverter into an output current with the same frequency, voltage and phase as the grid and then fed into the grid. The inverter system performs pulse-width-adjusted maximum power tracking on the wind rotor.

Main technical parameters of the utility model:

Wind wheel diameter 71m

Number of blades 3 blades

Blade material Composite material

Blade weight 2.95T

Cut-in wind speed 3.5m/s

Rated wind speed 12m/s

Working wind speed range 3m/s～25m/s

Cut out wind speed 25m/s

Strong wind resistance greater than 60m/s (specific indicators to be further studied)

Swept area 3957m2

Wind energy utilization rate ≥0.45

Speed regulation mode Pulp adjustment

Tower height Cylindrical 70m

Generator Basic Type Rare Earth Permanent Magnet Synchronous Generator

Rated power 1500kW

Maximum power 1650KVA

Rated speed 20r/min

Working speed range 12-20r/min

Motor maximum frequency 18Hz

Motor output voltage Line voltage 600VAC-750VAC

Generator efficiency ≥0.98

The main technical parameters conform to the national standard (or IEC standard). The operating environment temperature is -30°C to +40°C; the design life is 20 years; when operating below the rated wind speed, the maximum wind energy utilization coefficient of the whole machine is >0.45; the lightning protection design conforms to the IEC1024-I standard. The average service life of main components of wind turbines, generators, controllers, and inverters is 20 years.

Structural features of the utility model:

The generator is a hollow shaft, and maintenance personnel can enter the impeller hub from the nacelle through the hollow shaft when the generator is shut down, which provides convenience for the maintenance of the internal parts of the wind rotor.

The generator adopts continuous winding, there is no joint between the turns, and the winding of each phase will not be interrupted due to the connection point, which avoids the processing defects of the winding connection, ensures the high quality of the copper wire insulation without contact resistance, and avoids corrosive materials and Corrosion of the environment.

The generator adopts a special fractional slot, which greatly reduces the starting torque, reduces harmonics and tooth magnetic harmonics. The magnetic circuit design ensures a very high power factor, reaching above 0.99.

The degree of protection is IP54. Generator efficiency ≥ 0.98.

It is convenient to transport. The maximum diameter of the motor is 3.5 meters, which is in line with the Chinese road transport law. Unlike some foreign imported units, the diameter is very thick, and the thinnest is more than 4.7 meters, which does not comply with the Chinese road transport law.

More than 90% of the commissioning has been completed in the factory, including joint commissioning of the grid-connected inverter, controller and variable distance system, reducing the workload of on-site commissioning.

Features of the grid-connected unit of the utility model:

Equipped with a three-level grid-connected inverter, full-power inverter grid-connected. The power factor of the unit can be adjusted, and it is generally 1 when it leaves the factory. With low-voltage ride-through capability, if the grid fails (such as a short circuit), the wind turbine can remain connected to the grid for up to 3 seconds, and can properly support the grid voltage through the input current.

When the start-up procedure is running, the wind turbine is connected to the grid in a zero-current state, and operates to a normal power state in an adjustable manner.

Claims (7)

1. A 1.5MW permanent magnet direct-drive wind-driven generator set, is characterized in that, comprises wind wheel, permanent magnet low-speed synchronous generator, controller and inverter, and described wind wheel is connected with permanent magnet low-speed synchronous generator transmission , the permanent magnet low-speed synchronous generator is connected with the inverter, and the controller is connected with the permanent magnet low-speed synchronous generator and the inverter. 2. A 1.5MW permanent magnet direct drive wind power generator set according to claim 1, wherein the permanent magnet low-speed synchronous generator comprises a rotor and a stator, and the rotor is coaxially connected with the wind wheel, A three-phase winding coil is wound on the stator. 3. A 1.5MW permanent magnet direct drive wind power generating set according to claim 2, wherein the inverter is connected to the three-phase winding coil on the stator of the permanent magnet low-speed synchronous generator. 4. A 1.5MW permanent magnet direct drive wind power generator set according to claim 1 or 2, characterized in that the wind rotor is a three-bladed wind rotor. 5. A 1.5MW permanent magnet direct drive wind power generator set according to claim 4, characterized in that the shaft of the permanent magnet low-speed synchronous generator rotor is a hollow shaft. 6. A 1.5MW permanent magnet direct drive wind power generator set according to claim 1 or 5, wherein the permanent magnet low-speed synchronous generator is a rare earth permanent magnet synchronous generator, and its rated power is 1.5MW , The working speed is 12~20r/min. 7. A 1.5MW permanent magnet direct drive wind power generating set according to claim 6, characterized in that, the three-phase winding coil is a continuous winding coil.

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