KR20160123207A - Permanent magnet direct drive wind power generator system and sealing cooperative drying control method thereof - Google Patents

Abstract

Provided is a permanent magnet direct-drive wind-powered generator system and a sealing synergy drying control method thereof. The permanent magnet direct-drive wind-powered generator system comprises: a wind-powered generator and a converter including a rectifying unit, a DC busbar, and an inverting unit, wherein the inverting unit is connected to a power grid. A power supply switch is arranged on a first transmission line between the rectifying unit and the wind-powered generator. A permanent magnet direct-drive wind-powered generator includes a stator and a rotor, in the permanent magnet direct-drive wind-powered generator system, and further includes an air system, a grid-side reverse power supply switch, a switch controller, and a jet sealing device. The switch controller is connected to the air system, the power supply switch, and the grid-side reverse power supply switch and used for controlling turning-on and -off of the power switch and the grid-side reverse power supply switch and turning-on and -off of the air system. According to the present invention, the airflow generated by the air system, the heat generated from a stator winding while the wind-powered generator generates electricity, and the heat generated by reversing power supply can be comprehensively controlled and utilized, so sealing synergy drying of the wind-powered generator is achieved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct-drive permanent magnet wind power generator system and a sealing synergy dry control method thereof,

The present invention relates to a direct-drive permanent magnet wind power generator system and its sealing synergy dry control method, and belongs to the field of wind power technology.

In the prior art, an open direct-drive permanent magnet outer rotor wind turbine is advantageous for heat exchange by natural ventilation, and the pole is made of a permanent magnet material and has a magnetic lowering But the generator is often exposed to extreme harsh environments (exposed to wind, frost, rain, snow, dust, salt fog, etc.).

The inventor found that, in actual operation, the following defects exist in the prior art.

 (1) Direct-drive permanent magnet outer rotor The wind generator cools the stator core bracket and the outer wall of the rotor by natural wind, and the wind in a certain amount of natural environment enters the motor chamber through the stator and the rotor gap of the generator, And the light air after dipping pushes the exhaust air from the rear end sealing. Passing the air gap inside the motor is gas (vapor), liquid, solid polyphase flow (among which air, water vapor, rain, snow, salt fog, yellow dust, cottony matter exists etc.) Which deteriorates the electrical insulation performance of the motor and the mechanical performance of the motor, and reduces the remaining breakdown voltage level and service life, resulting in dielectric breakdown.

 (2) 60-100 meters of aerial work, especially in cabin maintenance and repair work, often can not be human or even impossible. Sealing and drying measures of wind turbines and their maintenance (inspection, repair, replacement) differ greatly in the degree of difficulty of generator operation of thermal and hydroelectric power plants operating on the ground. Some good ways to use on the ground are uncomfortable and even difficult to deploy in wind-powered units operating in the air.

 (3) Separately, the hot air drying method can not solve the demand for drying after the moisture between the lamination layers inside the stator core is wet, as a surface drying technique.

 (4) Applying an open structure not only prevents the risk of rain or snowy air entering the generator in the rainy or snowy weather, but also "insulated horizontal degradation" I pay the price.

 (5) After the shutdown, humid air is condensed in the air gap in the generator chamber and permeates into the motor. As a result, the coating layer of the motor stator and permanent magnet pole surface becomes moist and affects their service life.

An object of an embodiment of the present invention is to provide a direct-drive permanent magnet wind power generator system and its sealing synergy dry control method, whereby the air flow generated in the air system, the amount of heat generated in the stator windings and cores during power generation, Thereby achieving sealing synergy drying.

In order to achieve the above object, the present invention provides a direct-drive permanent magnet wind power generator system, comprising a wind power generator, a converter including a rectifier unit, a DC busbar and an inverter unit wherein the inverter unit is connected to a power grid, a first power transmission line between the rectifier unit and the wind power generator is provided with a power transmission switch, and the direct drive type permanent magnet wind power generator includes a direct drive Type permanent magnet wind power generator system,

An air system, a power network side reverse current transmission switch, a switch controller and a jet sealing device,

Wherein the stator includes a stator bracket, a stator core provided on an outer peripheral wall of the stator bracket, a paddle side tooth plate, and a paddle side board panel, And a rotor sealing ring mounted on the axial end surface of the rotor to match the stator;

At least one first pore is provided on an outer peripheral wall of the stator bracket, and at least one second pore is provided in the paddle side plate;

The stator further comprises at least one airflow passage communicating the first pore and the second pore and passing through the interior of the stator core;

The air system communicating with the first pore;

The jet seal device and the second pores communicate with each other to guide the airflow of the second pore in both directions so that one of the air flows into the annular gap formed by the paddle side board panel and the rotor sealing ring, To flow into the air gap between the stator and the rotor;

The power network side reverse transmission switch is installed in a second transmission line provided between the DC bus bar and the wind power generator;

The switch controller is connected to the air system, the transmission switch, and the power network side reverse transmission switch to control on / off of the transmission switch and the power network side reverse transmission switch and on / off of the air system.

An embodiment of the present invention further provides a sealing synergy dry control method for a direct-drive permanent magnet wind power generator system implemented by the direct-drive permanent-magnet wind power generator system, wherein the vicinity of the groove insulation of the wind power generator and / Detecting the humidity of the core lamination gap position or detecting the insulation resistance value of the wind power generator winding;

When the humidity exceeds a preset humidity threshold or when the insulation resistance value is smaller than the insulation resistance standard value in a time period when the wind farm is less than a wind or cut in wind speed, the transmission switch is turned off, Turning on the power transmission switch and operating the air system;

And operating the air system if the humidity exceeds a predetermined humidity threshold or the insulation resistance value is less than the insulation resistance standard value when the wind turbine is in the grid-connected power generation time zone.

Embodiments of the present invention also provide a sealing synergy dry control method for a direct-drive permanent magnet wind power generator system that is executed by the direct-drive permanent magnet wind power generator system, wherein the wind- Turns off the transmission switch and turns on the power network side reverse transmission switch and activates the air system if the wind speed is less than the no wind or cut wind speed;

Operating the air system if the wind power generator is in the grid-connected power generation mode,

Detecting humidity in the vicinity of the groove insulation of the wind power generator and / or the gap position of the core lamination or detecting the insulation resistance value of the wind power generator winding in a time when snow and rain do not fall;

If the humidity exceeds the predetermined humidity threshold or the insulation resistance value is lower than the insulation resistance standard value in a time period when the wind farm is less than the wind speed or cut wind speed, the transmission switch is turned off and the power network side reverse transmission switch is turned on Operating the air system;

And performing the processing step of operating the air system if the humidity exceeds a predetermined humidity threshold or if the insulation resistance value is less than the insulation resistance standard value when the wind power generator is in the grid- do.

The direct drive type permanent magnet wind power generator system and its sealing synergy dry control method of the embodiment of the present invention can be realized by switching control of the air conditioner, transmission switch and power network side reverse power transmission switch controller of the switch controller to the paddle side board It is possible to realize the gas sealing with respect to the annular gap position formed by the panel and the rotor sealing ring. In addition, it is possible to dry the air gap between the stator and the rotor by using a reverse air flow to remove the wet gas discharged from the inside of the stator, and at the same time, the amount of heat generated in the windings during power generation, The wet gas is discharged to the air gap between the stator and the rotor and the air flow generated in the air system is removed to realize sealing synergy drying.

1 is a structural cross-sectional view of a direct-drive permanent magnet wind power generator according to Embodiment 1 of the present invention.
2 is a partial structural schematic diagram of Fig.
3 is a schematic cross-sectional view taken along line AA in Fig.
4 is an axial explanatory view of an airflow path inside a stator core of a direct-drive permanent magnet wind power generator according to Embodiment 1 of the present invention.
5 is an airflow acquisition path in the stator of the direct-drive permanent magnet wind power generator according to Embodiment 1 of the present invention.
6 is a schematic diagram of a stator structure of a direct-drive permanent magnet wind power generator according to Embodiment 2 of the present invention.
7 is a partial structural schematic diagram of Fig.
8 is a schematic diagram of the entire airflow path of the direct-drive permanent magnet wind power generator of the embodiment of the present invention.
9 is a schematic diagram of the overall control structure of a direct-drive permanent magnet wind power generator system of an embodiment of the present invention.
10 is an external structural schematic diagram of a direct-drive permanent magnet wind power generator of an embodiment of the present invention.
11 is a partially enlarged schematic view of the position A in Fig.

First, the application environment and the technical principle of the embodiment of the present invention will be summarized and introduced.

1. Drying theory and technical support of the solution

 "Drying" refers to the process of removing liquid (mainly moisture) from a material, but most drying materials are those that lead to the release of liquid (or moisture) from the porous media. , The drying process is related to irreversible thermodynamics, phase transition thermodynamics, fluid dynamics, rheology, and surface science.

Here, the purpose of drying the inside of the motor is to keep the insulation of the groove of the winding, the core and the permanent magnet motor rotor-pole composite material protective layer in a relatively dry state. The thermal drying method is the most widely used main drying method. In the thermal drying method, energy is supplied to the material to change the moisture of the material into water vapor so as to be released from the material.

The convection drying process is characterized by the simultaneous transfer of heat and mass that occurs between the gas phase and the solid phase when the relatively high airflow and wet material are in direct contact with each other. Under any circumstance, calories (sensible heat) are always transferred from a high temperature location to a low temperature location, and the mass is always transferred on a low partial pressure over a high partial pressure. The temperature is determined based on the judgment of the direction of heat transfer and the partial pressure is determined based on the determination of the mass transfer direction. When the gas containing water vapor in the air does not reach the saturated state (unfiltered air), steam at the same temperature as the air comes into contact with each other When the surface temperature of the material is lower than the air temperature, the gas transfers heat to the solid. When the partial pressure of water vapor in the air stream is lower than the partial pressure of the solid surface water, the water vapor is vaporized and vaporized It is clear that the moisture inside the wetted material is diffused on the surface in the form of liquid or vapor. Thus, convective drying is a process of reverse transfer of heat and mass.

2. Equilibrium in water-gas-solid phase

The moisture is present in different forms in the solid material and can interconvert with the solids in different ways. If the solid material has a crystalline structure, it may contain a certain amount of crystals, and the moisture of this part is mutually bonded to the solid by the chemical force. If the solid material is porous, the moisture contained in the pores can be present in the pores and is subjected to the action of the hole wall capillary force. When the solid surface is adsorbed, the moisture contained in the solid is adsorbed and can be bonded to the inner and outer surfaces of the solid. The water that interacts with the solid by such chemical or physicochemical properties is collectively referred to as the combined water. If the material has a relatively high water content, some of the moisture is combined with the solid and the remaining moisture is simply mechanically attached to the solid surface, which is referred to as unconjugated water. The basic distinction between coupled and non-coupled water is that they have different equilibrium vapor pressures. The nature of the unbound water is the same as that of pure water, and the equilibrium vapor pressure it represents is the saturation and vapor pressure of pure water at the same temperature. However, the number of bonds is different, and the vapor pressure expressed by the presence of chemical and physical chemical forces is lower than the saturation and vapor pressure of pure water at the same temperature. The equilibrium vapor pressure remains constant regardless of the amount of unbound water present in the material, and is always the saturated vapor pressure of pure water. When the water content is reduced, there is no non-bonding water, and then the relatively weak water is preferentially removed, and then the equilibrium vapor pressure is gradually lowered by the binding of relatively strong water. If all the moisture in the solid material belongs to the non-bonding water, as long as the air is not saturated and there is sufficient contact time, all moisture is removed by the air as if rain water on the road after rain is dry on the wind. However, when the number of bonds exists, the situation is different. When the air of relative humidity ψ is wetted by a wet solid of the same temperature, the moisture content of the solid material decreases after a long time, but can not be absolutely dried. The limit at which the material is dried in the specified air condition is called the equilibrium moisture content in the air state, and all the moisture that can be removed by the designated air is called free moisture. Whether or not it is combined with water is independent of the air condition, which is the property of the solid material. When the moisture content of the solids is relatively low (all belonging to the number of bonds) and the relative humidity ψ of the air is relatively high, the contact of both does not reach the purpose of drying the material, and the moisture may transition from the gas phase to the solid phase. That is, a hygroscopic phenomenon occurs, for example, a phenomenon in which the cake becomes damp. The overall drying process can be divided into a drying step at a constant rate and a drying step at a reduced rate. The heat transfer and mass transfer in each drying step are characterized by their respective characteristics.

3. Macro characteristics of the direct-driven outer rotor permanent magnet wind turbine drying process

 (1) Generators Rotor Permanent Magnetic Material Poles Composite Material Protection Layer and the amount of humidity between the outside surface and the dry air,

A brief analysis of the heat exchange and mass exchange mechanism between the outer surface of the generator rotor pole composite protection layer and stator (core and winding) and dry air.

The external medium limit layer (boundary layer) having a thickness of δ on their surface during heat exchange and mass exchange outside the generator rotor-pole composite protective layer and the stator (core and winding) plays an important role, And steam), the velocity of the external medium heat air and the distribution of temperature and pressure are different from those of the motor interior chamber environment.

The concentration, temperature, pressure, and velocity within the limit layer in the drying process of the rotor pole are different from each other in the changing rule. In the limit layer of 0-δ, the velocity of the drying medium in the motor is in ascending order and the temperature is in ascending order. The velocity gradient and the temperature gradient of the external medium coincide with each other but the humidity concentration is descending and the steam partial pressure is decreasing. The partial pressure gradient, the velocity gradient, and the temperature gradient are opposite to each other. The fact that the gradients are opposite to each other and the fact that the concentration of humidity in the critical layer is high all causes the material (rotor-composite material protective layer, stator) to reduce the moisture transfer amount to the outside and decrease the drying rate. However, since the gradient is relatively large along the 0 direction from the limit layer δ, relatively heavy air flows on the surface of the material and the water vapor having a relatively small molecular weight is directed to the air gap position between the motor stator and the rotor, Bringing in, the introduction of heat air breaks the critical layer, enhancing heat transfer and drying.

 (2) Quantitative analysis of generator mass rotor permanent magnet materials Paul composite material protection layer and stator external mass exchange

When water vapor diffuses at a constant rate of drying and transports moisture to the outside dry air of the generator rotor pole composite protection layer and the stator (core and windings) through the limiting layer, the amount of moisture transfer and convection mass transfer between them and dry air Explain the formula as follows.

(Convective mass transfer coefficient with the chemical potential as the transfer potential) x (the wet air chemical potential in the material surface and the external medium (specifically in dry air in the application environment of the present invention) In which the material referred to here may specifically correspond to the rotor pole protective layer and the stator surface portion, and the medium may correspond to dry air.

When the temperature gradient of the boundary layer is very small, the moisture content of the medium and the external medium is controlled by the vapor partial pressure of the vapor transfer potential. The vapor transfer density = (the vapor pressure is the convective mass transfer coefficient of the humidity transfer potential) × (Difference between material surface steam pressure and external medium vapor pressure) x 760 / atmospheric pressure.

The relative humidity concentration u at the deceleration drying time is the transfer potential of moisture (including steam) from the material surface to the ambient medium, Moisture transfer amount = (Moisture content concentration is the convection mass transfer coefficient of the mass transfer potential) x (The difference between the material surface moisture amount concentration and the equilibrium humidity amount concentration).

 (3) Production In the manufacturing process, the generator rotor pole penetrates into the humid air and leaves a tail ring.

Permanent magnet materials made of glass fiber reinforced resin Pall protection layer, magnet steel and rotor magnet Adhesive to the yoke wall gap adsorbs air and water vapor in these process pores.

It should be noted that as the generator rotor proceeds in vacuum plastic injection in the vertical position, the number of deposits vaporized in the vacuum state is vaporized at about 43 degrees Celsius. Glass fiber fabrics belong to a porous material, and the three-dimensional network carrying moist air moisture before use provides a material condition that encloses moist air during the infiltration period. The heating and vaporization in the process of forming the pole protection layer corresponds to the formation of bubbles by pressure extrusion at the time of vacuum extraction, and the glass fiber fabric belongs to the porous material stereoscopic structure and meets the requirements of the vapor vaporization core material structure .

 (4) Evaporation mechanism of the generator stator core and in-groove winding heat transfer coupling water

Generator stator Vacuum Nice Rotate Analyze various environments in which the generator material during the baking process, operation usage process, shutdown process, climate and seasonal change process. The "porous material" property category defines between the laminations of the stator core (solid-state frame), between the conductors of the windings and the multilayer (polymeric) insulating material, and between the grooved insulation. Heat transfer inside the stator material, interstitial gas, Water, steam and air (including salt mist) mass transfer inside the stator and between the material and the environment Mass transfer mass of the mass diffusion; between the material inside the stator by the heat generated in the conductor When the gas (water vapor and dry air) changes state (phase change: evaporation of liquid water or condensation of water vapor), and the material is in the heating process, the water vapor mass varies depending on the phase change. As a result, The sealing distribution is changed to form a steam-sealing gradient (the driving force of diffusion); the change in the internal water content and the relative humidity of the environment are mutually balanced The size of the humid air humidity inside the material determines the vapor mass transfer, ie, the direction of water vapor transmission inside and outside the humid air and the air gap inside the outer side); Evidence image data shows the following: Shows that the thermo-pressure change generated inside the porous material does not reflect the temperature condition of the natural wind cold side between the laminations, but the pressure drop rate is also inconsistent due to the mismatch of the leakage paths in various places Particularly important are the self-pores and porosity that can be provided between water-in-material laminations, between conductors and multilayer (polymeric insulation) materials, and between grooves in insulation, and the porosity is the premise on which such mechanisms exist.

When the water is magnetized under the action of a strong magnetic field, the bonding state of the water molecule itself also changes from a long chain to a short chain so that the water can easily penetrate into the solid core lamination gap position to promote the capillary phenomenon between the laminations, So that the shape of the core is changed after coring so that it is converted into a fine sediment which is removed by the water stream.

 (5) Calorie content of the rotor pole composite material protective layer

When the moisture content of the material is relatively low during the heating and drying process of the porous wet material with such "Moses", such as the pole glass fiber reinforced resin protective layer, which is the permanent magnet material of the generator rotor, And when the moisture content of the material is relatively large, the moisture content in the material is partly transferred to the evaporation layer of the material in the form of liquid water, where it is evaporated and then exits in the form of vapor. As the heating is intense and the moisture inside the material is vigorously vaporized and the velocity of the vapor is lower than the rate of vaporization, the volume of water and vapor increases drastically. However, when the porous material gap There is a relatively large flow resistance in the material and thus a relatively large pressure gradient is formed in the material. In addition, the water film is also flowed on the wall of the porous material, which is an important way in which liquid water is transferred in the material, and this migration strengthens the evaporation by constantly supplying liquid water to the evaporation layer. When the concentration gradient of the wetness and the direction of the temperature gradient coincide with each other, the process of transferring the moisture content can be expressed as follows.

(Flow-through density due to gradient of concentration in the material) + (flow-through density due to temperature difference in the material) + (flow-through density due to pressure difference in the material)

That is, the three slopes, such as the moisture content gradient, the temperature gradient, and the pressure gradient, are determined jointly.

4. Analysis of wind turbine working environment and sealing mechanism

In the course of the operation of the wind turbine generator, the paddle side usually meets the reverse wind direction, and the reverse wind direction collides with the generator stator bracket to generate rebound, sputtering, and again after encountering the rotor sealing ring, (Compared to flow). This air current penetrates into the annular air gap between the paddle side board panel and the rotor seal.

The embodiments of the present invention have been made in connection with such technical problems. The technical principle of the embodiment of the present invention is that the air heat source inside the unit is drawn into the axial end face of the stator core by using the air flow passage in the stator core of the direct drive permanent magnet wind power generator and also by the pillar side board panel and the rotor sealing ring A jet sealing device is provided at the formed annular gap position (in the preferred embodiment, the spiral comb means is provided at the annular gap position formed by the paddle side board panel and the rotor sealing ring) A micro static pressure environment is established in the space to prevent intrusion of poor air currents (gas, liquid, solid polyphase flow, among which air, water vapor, rain, snow, salt fog, yellow dust, . The "microstatic pressure " referred to in the embodiment of the present invention refers to the air flow generated through the air heat source inside the motor system. The pressure created at the" annular sealing gap " And the pressure may be such that the external airflow is prevented from entering the motor, wherein the poor airflow mainly refers to a gas liquid two-phase flow of rainwater or a gas solid two-phase flow of wind and snow. In extreme cases, there are multiphase flows of gases, liquids and solids, such as air, water vapor, rain, snow, salt fog, sandstorms and cotton-like substances. The apparatus of the embodiment of the present invention is mainly designed to prevent such a bad air flow, but in normal dry weather It is possible to let the dry air flow into the wind power generator without using the apparatus of the embodiment of the present invention, thereby drying and cooling the wind power generator.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1

The direct drive permanent magnet wind power generator system of this embodiment further comprises an air system, a power network side reverse power transmission switch, a switch controller and a jet device on a base including a wind turbine and a converter as a whole, Thereby realizing the sealing and drying of the wind power generator. Hereinafter, each part will be described.

1 is a structural cross-sectional view of a direct-drive permanent magnet wind power generator according to Embodiment 1 of the present invention. For convenience of explanation, the upward direction of FIG. 1 is defined as the paddle side (the paddle side is opposed to the windward side in the wind power generator working process), and the downward direction is defined as the tower side (Facing the downwind side) and defines the horizontal direction as the radial direction and the vertical direction as the axial direction (along the axis of rotation of the wind power generator).

A wind turbine of an embodiment of the present invention comprises two parts of a stator and a rotor, and Fig. 1 shows the structure of a wind turbine in a cross-sectional view. Here, the stator includes a stator bracket 1, a stator core 8 provided on the outer peripheral wall of the stator bracket 1, a paddle side plate 6 provided on an end surface in the axial direction of the paddle of the stator core 8, (3). The outer circumferential wall of the stator bracket 1 is in contact with or adjacent to the stator core 8 or the punching fixing key 7 (see Fig. 3) of the stator core 8, As shown in FIG. In addition, the rotor matched with the stator has a rotor sealing ring 16 which is located on the paddle side and forms an annular gap with the paddle side board panel 3.

At least one first pore 2 may be provided on the outer circumferential wall of the stator bracket 1 of the stator structure and at least one second pore 5 may be provided on the paddle side plate 6. [ The stator further includes at least one airflow passage (9) communicating the first pore (2) and the second pore (5) and passing through the interior of the stator core (8).

In addition to the wind turbine generator, the direct-drive permanent magnet wind turbine system further includes an air system and a jet sealer device for supplying gas to the jet sealer, the air system being connected to the first pore (2) And the jet sealing device communicates with the second pores 5 to guide the airflow generated in the second pores 5 through the jet seal device to flow in two directions so that one of them The arrow in the left direction flows to the annular gap formed by the paddle side board panel 3 and the rotor sealing ring 16 to seal the annular gap position to prevent intrusion of the harsh external air flow, (Arrows in an approximately right direction in the upper part of Fig. 1) flows into the air gap between the stator and the rotor to mainly dry the stator, the rotor surface, and the pole surface, It is to be removed.

In order to discharge the moisture inside the motor, the direct-drive permanent magnet wind power generator system of the present embodiment also controls the converter by using the wind power generator to generate heat from the stator windings during power generation The inside of the stator is dried to discharge the moisture to the stator surface and the air gap between the stator and the rotor. Here, as shown in Fig. 9, the converter includes a rectifying unit, a DC bus bar, and an inverter unit, and the inverter unit is connected to a power grid. A power transmission switch K1 is provided in the first transmission line L1 between the rectification unit and the wind power generator and a power network side transmission switch K2 is installed in the second transmission line L2 provided between the DC bus bar and the wind power generator do. In addition, the direct-drive permanent magnet wind power generator system further includes a switch controller, which is connected to the air system, the transmission switch K1 and the power network side transmission switch K2 (the dotted line in Fig. OFF control of the power transmission switch K1 and the power network side reverse transmission switch K2 and on / off of the air system.

When the air system is operated through the switch controller, the jet sealing device ejects airflow to realize sealing of the paddle-side annular gap while generating airflow passing through the air gap between the rotor and the stator, Lt; / RTI > At the same time, when the wind power generator is in a power generation state, a current is generated in the stator winding itself to generate heat, and when the wind power generator is in the non-power generation state, the transmission switch is turned off via the switch controller to turn off the reverse power transmission switch . This reverse power transmission by the power grid also dissipates the stator windings. The stator winding is heated to dry the inside of the stator so that moisture is discharged to the surface of the stator and the air gap between the stator and the rotor and then mixed with the airflow generated in the jet sealing device to remove the discharged moisture, . As can be seen from this, the synergistic combination through air system, jet seal device, winding power generation heat control and winding reverse power generation heat control is effective for wind power generator to seal against external bad air current, to dry stator and rotor surface, It is possible to realize various functions such as drying inside, realizing sealing synergy dry in wind turbine generator, and rationally controlling air system, transmission switch and power network side transmission switch through switch controller. ) And the state in which the wind turbine is present (power generation state or shutdown state, etc.).

Hereinafter, major parts of the direct-drive permanent magnet wind turbine generator system will be described in detail.

(1) Jet sealing device

The specific structure of the jet sealing apparatus is preferably the first spiral comb means 4, which is a partial structural schematic diagram of Fig. 1, as shown in Fig. 2, which is an active sealing structure using spiral comb. As shown in FIGS. 1 and 2, at least one comb air intake hole 21 is provided on one side of the paddle side board panel 3 close to the rotor, and the comb air intake hole 21 and the second pore 5 are correspondingly connected through an air guide pipe 22 and a first spiral comb-shaped means 4 having an annular shape as a whole is formed on one side of the paddle side board panel 3 close to the rotor sealing ring 16 The first spiral comb-shaped means 4 and the comb air intake holes 21 are in communication with each other and the first spiral comb-shaped means 4 comprises a first spiral comb, 3 and the rotor sealing ring 16 to create a flow of air that spirals through the annular gap.

In the above structure, the airflow generated from the internal air heat source through the first pores 2, the airflow passages 9 and the second pores 5 is caused to enter the axial cross section of the stator core 8, The air current is supplied from the second pore 5 to the first spiral comb-shaped means 4 of the paddle side board panel 3 through the comb air intake holes 21 provided in the air guide pipe 22 and the paddle side board panel 3 ) To generate a spiral flow in the annular gap.

Here, the first pore 2, the second pore 5, and the comb air intake hole 21 may be circular, triangular, or elliptical, and the pore may be a gas orifice of other shapes. , That is, the air flow only needs to be conducted. Preferably, the pores are circular pores, and the circular pores can reduce the flow friction resistance to the air flow.

In practical applications, the ends of the rotor sealing ring 16 are suitably protruded to the outside and the ends of the rotor sealing ring 16 are made relatively relatively thin (as shown in FIG. 1) to ensure a sufficient length of spiral comb Allows the effect of spiral flow to be fully demonstrated.

The stator structure carrying the first spiral comb-shaped means 4 draws the air current in the stator core in the axial direction of the stator core 8 and forms a spiral airflow through the first spiral comb- Since the spiral airflow itself has a certain gas sealing action, the micro static pressure environment is created at the annular gap position, and the external bad airflow entering from the annular gap between the paddle side board panel 3 and the rotor sealing ring 16 (For example, rain or snow) to prevent the airflow from entering the motor, thereby prolonging the service life of the permanent magnet pawl 18 and preventing the "insulated horizontal reduction " Thereby reducing the risk of erosion of poor air currents (such as rain or snow) and ensuring insulation reliability.

2, the air suction hole 21 can be located at the center of the first spiral comb-shaped means 4 and the first spiral comb can be positioned around the comb-shaped air suction hole 21, The first spiral comb which is separated from the stator bracket is referred to as a first upper spiral comb 41 and the first spiral comb adjacent to one side of the stator bracket is referred to as a first lower spiral comb 42 .

Preferably, the spiral directions of the first upper spiral comb 41 and the first lower spiral comb 42 are opposite to each other, so that a two-fork flow whose directions of rotation are opposite to each other can be formed, have.

2, the first upper spiral comb 41 is tilted in a direction away from the stator bracket and the first lower spiral comb 42 is inclined in a direction approaching the stator bracket, as shown in the cross- Loses. The angle of inclination of the spiral comb changes the direction of the acting force on the airflow so that the airflow of the spiral motion increases the advancing speed of the spiral comb in the oblique direction and combines with the feature that the directions of rotation of the upper and lower spiral comb are opposite to each other, The spiral sealing effect is greatly increased by forming a reverse-directional spiral seal by forming an air flow in which the directions of motion are opposite to each other and marching in an acceleration direction in the upper and lower directions. In addition, the wind power generator can improve the effect of the reverse pair spiral sealing by advancing the forward and backward airflow in two directions due to the movement of the rotor in the course of work.

Specifically, the overall motion of the airflow in the first spiral comb-shaped means 4 can be divided into a helical motion proceeding generally along the circumferential direction of the stator and a linear motion proceeding generally along the stator axial direction. 2, when all of the spiral combs of FIG. 2 are all horizontally oriented (the horizontal referred to here refers only to the plane shown in FIG. 2), the spiral direction of the airflow is generally perpendicular to the paper plane (I.e., the plane in which the center comb 23 of FIG. 2 is located), and the airflow advances in the upward and downward directions of FIG. 2 in a spiral manner, but if the spiral comb direction has a constant inclination angle, The helical motion of the airflow advancing upwardly in Fig. 2 as the first upper spiral comb 41 is tilted upwards is no longer horizontal, but the tilt angle of the helical motion is directed away from the stator bracket, In the first lower spiral comb 42, the tilt angle of the helical motion generates an airflow in the direction of approaching the stator bracket, It is possible to speed up the binary exert an effect of preventing the external air flow better.

The first central comb 23 is installed in the comb-shaped air intake hole 21, and the first central comb 23 is installed in the comb-shaped air intake hole 21. The first central comb 23 is provided in the comb- 1 and 2), the first central comb 23 divides the comb-shaped air intake holes 21 into two airflow outlets (upper and lower airflow outlets) That is, divided into an upper airflow outlet 211 and a lower airflow outlet 212 so that some airflow flows through the first upper spiral comb 41 in a direction away from the stator bracket, So as to flow in a direction close to the stator bracket 1 through the spiral comb 42.

It should be pointed out that the first central comb 23 is not an indispensable member and may make the comb-like suction holes 21 directly face the first upper spiral comb 41 and the first lower spiral comb 42. [ In other words, the first central comb 23 can be omitted, so that a part of the comb-like air intake hole 21 faces the start end of the first upper spiral comb 41, and the other part is directed to the first lower spiral comb 42, it is possible to classify the airflow, but it is possible to reduce the loss of the airflow pressure and the flow velocity under the condition that the first central comb 23 is installed, so that the upper and lower spiral airflows can be more well isolated have.

The air flow of the air heat source generated inside the first spiral comb-shaped means (4) around the comb-shaped air suction hole (21) is divided into two-branch flow.

On the other hand, the first lower spiral comb 42 can generate an airflow moving downward along the entire annular gap spiral, which flows through the first lower spiral comb 42, Barriers " that are intended to be drawn into the counter-wind annular gap of the motor, generated in the reverse wind direction (the maze sealing of the spiral structure feature with the inclination angle of the first lower spiral comb 42) Liquid solid polyphase flow "

On the other hand, the first upper spiral comb 41 can create a flow of air moving upward along the entire annular gap spiral, which flows through the first upper spiral comb 41, (A labyrinth seal characteristic of a spiral structure having an inclination angle of the first upper spiral comb 41) by the "spiral comb sealing combination" while forming a pressure airflow annular barrier " (Air gap between the right side stator and the rotor) to dry the surface of the inside of the motor and then gathered along the axial direction on the cab side of the stator end (i.e. between the tower side dental plate 10 and the rotor end cap 19) Finally, the annular gap between the end cap sealing ring 20 and the tower side board panel 11 is passed and discharged to the atmosphere. The upward spiral flow is a drying air stream for convection of heat exchange mass transfer to remove moisture from the stator and rotor surfaces and the surface of the poles (heat generated and discharged from the windings inside the motor) Preventing returning to the motor to prevent returned moisture from destroying the insulation of the inner insulation material of the motor.

The spiral direction of the first upper spiral comb 41 may be designed in the same direction as the rotation direction of the rotor. By this design, the airflow passing through the upper spiral comb can be used more effectively. On the other hand, by the frictional force between the rotor sealing ring 16 and the air flow by using the rotating action of the rotor sealing ring 16, The upward movement of the airflow can be accelerated and the air gap between the stator and the rotor (the gap through which the arrow marking the airflow on the right side in FIG. 1 passes) can be accelerated at a higher speed, Improves efficiency. On the other hand, when the airflow is introduced into the air gap position between the stator and the rotor, the drying rotor permanent magnet paw enhances the action of the erosion-resistant glass fiber to strengthen the resin coating layer, while strengthening the surface of the drying stator, , The synergy of the dry air flow field and the humid air concentration field in the air gap is relatively high to achieve the purpose of enhancing the drying.

It should be noted that the pump head (the end of the spiral comb) generated in the "spiral comb sealing combination" (that is, the first upper spiral comb 41) The pump head produced in the "spiral comb sealing combination " in the upward direction is directed upward, and the spiral directions of the first upper comb 42 can be provided in directions opposite to each other. That is, a spiral having opposite directions of rotation is formed at both ends with the first central comb 23 as a boundary, thereby generating airflow which is opposite to the direction of the spiral motion, thereby being more advantageous for classifying the two airflows and enhancing the action of the labyrinth sealing Since the airflows from the upper and lower airflow outlets are perforated around the annulus, it is advantageous to form the pressure airflow that coincides with the circumference of the annulus by accumulating the "pressure".

In the technical solution of the embodiment of the present invention, the idea of using the air pressure sealing technique is to use the pressure of the jet air in the spiral comb to make the annular gap in the reverse wind direction wind intake port of the open- Space " and "micro static pressure " to close the gap between the rotating member and the stationary member of the generator to prevent the reverse wind direction air flow from entering the gap with rain water or snow, The pressure generated in the seals is much greater than the pressure in the natural environment of the motor and establishes the sealing structure of the open wind turbine and the specific structure of the airflow path.

Taking all the above into consideration, the sealing means includes two sealing states such as static sealing and dynamic sealing in a sealing state, and includes a combination of three sealing principles such as comb, spiral, and air pressure by a sealing mechanism, It can be shielded outside the gap.

In addition, the reverse wind direction air flow has rainwater (or snow) and is obstructed by the wind power generator, and then passes through the stator board panel and the rotor sealing ring 16 (board panel) And the rotor sealing ring 16, and the gas-liquid two-phase flow of rainwater or the gas solid two-phase flow of wind and snow creates a pressure in the reverse-wind annular gap of the generator. It is possible to calculate the pressure and the flow velocity required by the outlet air flow of the spiral comb means as the pressure-sealing material in the annular gap by using the basic principle of the equilibrium state of the fluid mechanics. The airflow in the expanded cavity of the labyrinth seal flows into the outlet and acts to build up an "open loop spiral flow chamber " to cover the uniform pressure of the main pipe flow. Spiralcomb combination pressure sealing is performed at a pressure sufficient to provide the air heat source The pressure of the air pressure sealing can be automatically adjusted based on the demand, and the "automatic adaptation" control can be realized. Thereby achieving the object of relatively reducing the power consumption of the air heat source.

In addition, the air guide pipe between the comb-shaped air suction hole 21 and the second pore 5 may have the following two forms.

1) The air guide tube 22 is annular in its entirety. The air guide tube 22 extends along the periphery of the paddle side plate 6 to form a 360-degree annular shape. In this structure, the airflows flowing out of the plurality of second pores 5 are uniformly mixed in the circumferential direction, and are then introduced into the comb-type air intake holes 21, and then, in the circumferential direction of the airflow introduced into the comb- So that the pressure is uniform.

2) The comb-shaped air suction holes 21 and the second pores 5 are correspondingly connected to a plurality of air guide pipes 22 separated from each other. This structure is relatively simple in the production of the member since there is no need to manufacture the annular air guide pipe 22. The air guide pipe 22 can be determined based on the quantity of the second pores 5. For example, the number of the air flow passages introduced below may be 48, 48 can be installed.

 (2) An air flow passage inside the stator core

The air flow passage 9 inside the stator core 8 is for drawing the air heat source provided in the air system 12 inside the stator to the position of at least one second pore 5 provided in the paddle side plate 6 . 3 is a schematic cross-sectional view taken along the line A-A in Fig. 1. As shown in Fig. The punching fixing key 7 is fixed to the outer peripheral wall of the stator bracket 1 and the stator core 8 (the stator core 8 is formed by combining a plurality of core modules and the intermediate core module is composed of core lamination) The dovetail groove is provided in the punching fixing key 7 to fix the stator core 8 to the outer peripheral wall of the stator bracket 1. [ The first pore 2 may be located on the outer peripheral wall of the stator bracket 1 contacting the punching fixation key 7 and the air flow passage 9 may pass through the pores of the punching fixation key 7, 2).

1, the airflow passage 9 may include a radial airflow passage 92 and an axial airflow passage 91. The radial airflow passage 92 is formed by a punching fixed key 7, And the stator core 8. One end of the radial air flow passage 92 is connected to the first pore 2 and the other end is connected to the axial air flow passage 91 and the axial air flow passage 91 May pass through the interior of the stator core 8 along the axial direction and communicate with the second pores 5. [ Here, the radial air flow passage 92 may be directly connected to the axial air flow passage 91, or may be connected again after an arbitrary bend. In other words, the radial air flow passage 92 and the axial air flow passage 91 ).

In addition, the number of the first pores 2, the second pores 5, and the airflow passages 9 may be plural and may be the same and may be uniformly arranged along the circumference. The plurality of first pores 2, the second pores 5 and the airflow passage 9 are communicated in a corresponding manner to form a plurality of independent airflow passages from the inner wall of the stator bracket 1 to the paddle side plate 6, . The radial air flow passage 92 in the downward direction of the inner paddle side tooth plate 6 of the stator core 8 is drawn into the axial air flow passage 91 in the direction of rotation of 90 degrees inside the stator core 8 , The axial air flow passage 91 is balanced with the stator axial direction of the motor. As shown in FIG. 4, FIG. 4 is a schematic diagram of an airflow path inside a stator core of a direct-drive permanent magnet wind power generator of an embodiment of the present invention. Here, the radial airflow passages correspond to the axial airflow passages, respectively. Although only the axial flow passage is shown in the accompanying drawings, several embodiments of the present invention include a plurality of flow passages. 4 is a schematic diagram of an air flow path inside the stator core of the direct-drive permanent magnet wind power generator according to Embodiment 1 of the present invention, and all 48 air flow passages are provided, The lengths (L ₁ , L ₂ ... L ₄₈ ) / inner diameters (d ₁ , d ₂ ... d ₄₈ ) / absolute roughnesses (ε ₁ , ε ₂ ... ε ₄₈ ) The interval is also consistent.

 (3) Air system inside wind turbine generator

As shown in Figure 5, the air heat source in the wind power generator's internal air system 12 (specifically, the air system 12 may be installed between the stator brackets or within the cabin space) can do. Air system 12 can prevent intrusion of "gas-liquid two-phase flow" of rain and wind and "gas solid two-phase flow" of wind and snow into rain, snowy weather time zones, Work in a time zone that needs to dry the inside of the motor, thereby sufficiently drying the generator stator insulation and rotor pole protection layer and reducing the energy consumption of the air heat source. The air flow passage 9 provided in the stator is connected to the air system 12 through the first pore 2 to draw the air heat source inside the wind power generator into the air flow passage 9. The air system 12 may include an air heat source generating device that generates a predetermined pressure airflow and an air heat source processing device that can purify and dry the airflow.

 The air heat source generating device may be an air compressor or a blower, and the air compressor (or a compressor) is an air pressure generating device that improves the air pressure or transfers air, and converts the mechanical energy supplied by the prime mover into air pressure energy . The air in the compressor cylinder is compressed rapidly during the operation of the air compressor, and the process of rapidly compressing the gas is one of heat dissipation processes, which inevitably raises the temperature of the compressor cylinder. The exhaust temperature at the end of the multi-stage compressing air compressor can reach 140-170 ° C. At this high temperature, compressed air is often mixed with a certain amount of gas oil and water vapor. The oil and moisture contained in the air should be separated for the first time to prevent oil and moisture from flowing into the stator core flow passage of the wind turbine along with compressed air. Therefore, the air heat source treatment apparatus may further include an air filter, a cooler, an oil water separator, and a dryer. Here, the air filter filters the gas (that is, dust and other impurities contained in the air in the filter cabin) before being introduced into the air compressor cylinder, and the dust, solid impurities and the like in the air are introduced into the air compressor, In order to prevent friction and wear of the member moving with the rotation.

The oil-water separator (gas-liquid separator) further separates the oil and moisture contained in the compressed air so that the compressed air can undergo a rudimentary purification treatment, so that oil and moisture flow through the motor stator bracket and the flow passage in the core, It is for removing pollution and corrosion inside.

In addition, the compressed air still contains a certain amount of water after passing through the cooler and the oil separator, and its content is determined by the temperature of the air, the pressure and the relative humidity. Dry air is required in the motor, and an air dryer or dryer is to be installed.

5 is an airflow acquisition path in the stator of the direct-drive permanent magnet wind power generator according to the first embodiment of the present invention. The air system 12 includes a main pipe 13 and a branch The branch pipe 14 can be connected to the first pore 2 through the pipe 14 and can draw out the branch pipe 14 having the same quantity as the first pore 2 in the main pipe 13, And is connected in correspondence with the pores (2). Preferably, the main pipe 13 is in the form of a circular loop and may be a segmented circular loop segment, thereby reducing frictional resistance due to flow to the air flow.

In addition, there are two types of drying heat sources, one is to install a dryer in the air system 12, and the other is a stator coil. When the stator coil is used as a dry heat source, it can be applied even in a shutdown state. Since the stator coil is reversely transmitted to the stator of the generator via the inverter unit of the converter through the power grid, the internal structure of the stator and the internal material are dried with the heat generated by the stator. The moisture inside the stator is discharged to the surface of the stator by the amount of heat generated by the stator itself and then the moisture is discharged to the surface of the stator by using the dry air generated in the internal air system 12, Thereby achieving the effect that the outside of the stator is dehumidified at the same time.

 (4) Airflow flow path

The airflow in the cabin is transferred to the first pores 2 of the stator bracket 1 after filtration, drying and compression of the air system 12 and the airflow is passed from the first pore 2 through the punching fixed key 7 Enters the radial air flow passage 92 of the stator core 8 and flows into the axial air flow passage 91 along the radial air flow passage 92 and then flows from the axial air flow passage 91 to the paddle side Through the second pores 5 on the tooth plate 6 and then through the air guide tube 22 to draw the airflow into the comb-shaped air intake holes 21 of the paddle-side board panel 3, 21) is drawn into the first spiral comb-shaped means (4) to form an upper and a lower spiral air flow, and a downward spiral airflow closes the annular rotation gap to form a gas solid 2 Phase flow or the gas phase of rainwater and gas to prevent intrusion of liquid two-phase flow, (I.e., between the tower-side dental plate 10 and the rotor end cap 19) at the stator end portion along the axial direction after the air- And eventually passes through the annular gap between the end cap sealing ring 20 and the tower side board panel 11 and is discharged to the atmosphere. Such a rebound partial current flows inside the end link 17 And the pawl 18 can also be dried.

 (5) Sensor, switch controller and switch control strategy

Sensors or detection devices can be installed in the wind turbine for more rational control of air systems, transmission switches and power network side transmission switches, and control is performed as a switch controller by detecting the humidity and / or insulation conditions inside the wind turbine As the case may be.

Specifically, the direct-drive permanent magnet wind power generator system of the present embodiment may further include a humidity sensor installed near the insulation of the wind turbine groove portion and / or at the position of the core lamination gap. When the humidity sensor and the switch controller are connected, The controller can be used for the following controls:

When the wind farm is smaller than the wind or cut wind speed, the humidity value detected by the humidity sensor is judged. If the humidity value exceeds the preset humidity threshold, the power transmission switch is turned off and the power network side transmission switch is turned on. Operate;

When the wind turbine is in the grid-connected power generation state, the humidity value detected by the humidity sensor is determined, and the air system is operated when the humidity value exceeds the predetermined humidity threshold value.

In addition, the direct-drive permanent magnet wind power generator system may further include an insulation resistance value measurement device near the wind-power generator groove isolation and / or core lamination gap location, wherein the insulation resistance value measurement device is connected to the switch controller The switch controller can be used for the following controls:

When the wind farm is lower than the wind or cut wind speed, the insulation resistance value detected by the insulation resistance measuring device is judged. If the insulation resistance value is lower than the predetermined insulation resistance standard value, the transmission switch is turned off and the power network side reverse transmission switch is turned on Operating the air system at the same time;

When the wind turbine is in the grid-connected power generation mode, the insulation resistance value detected by the insulation resistance value measuring device is determined. If the insulation resistance value is smaller than the predetermined insulation resistance standard, the air system is operated.

It should be noted that the humidity sensor and the insulation resistance value measuring device may be present at the same time or only one of them may be installed. In a situation where the humidity sensor and the insulation value measuring device are provided at the same time, It can be a combination of situations.

Example 2

On the basis of Embodiment 1, the stator of this embodiment is provided with spiral comb-like means on the tower side board panel on the tower side. Specifically, as shown in FIGS. 6 and 7, FIG. 6 is a schematic diagram of a stator structure of a direct-drive permanent magnet wind power generator according to Embodiment 2 of the present invention, and FIG. 7 is a partial structural schematic diagram of FIG. The stator in the tower side direction may further include a tower side plate 10 and a tower side board panel 11. The tower side plate 10 is provided on the axial end face side of the stator core 8 in the tower side. Correspondingly, the rotor bracket 15 forms an annular gap between the end cap sealing ring 20, the end cap sealing ring 20 and the tower side board panel 11. [

The second spiral comb-shaped means 24 is provided on one side of the paddle-side board panel 3 close to the rotor sealing ring 16, and the second spiral comb-shaped means is provided with the second spiral comb 241 , The second spiral comb 241 generates an air flow that spirals in an annular gap formed by the paddle side board panel 3 and the rotor sealing ring 16 to thereby seal the end cap sealing ring 20 and the tower side board panel 11 Quot; pressure air flow annular barrier " in the annular gap formed between the outer surface of the wind turbine and the outer surface of the wind turbine.

As described in the first embodiment, the airflow of the first upper spiral comb 41 is drawn into the motor air gap (air gap between the stator and the rotor at the right side in Fig. 1) to dry the surface of the inside of the motor, (I.e., between the tower side tongue plate 10 and the rotor end cap 19) of the stator end portion and passes through the annular gap between the rear end cap sealing ring 20 and the tower side board panel 11, Environment. The second spiral comb-shaped means 24 of the present embodiment acts on this air flow and is discharged to the outside after passing through the second spiral comb-shaped means 24 when the air flow is collected on the cabin side of the stator end, The means 24 establishes a pressure sealing environment in the annular clearance on the tower side by creating a flow of air that spirals by this airflow from the paddle side.

The second spiral comb 241 in the cross-sectional view of the second spiral comb is preferably moved in a direction close to the stator bracket 1 in order to further prevent the poor outside air flow into the wind turbine, The tilting angle of the tilted helical motion generates an airflow directed toward the direction close to the stator bracket, thereby preventing the entry of the external airflow more effectively.

Having introduced the structure of the two embodiments above, the entire airflow path will be described in the actual application. As shown in Figure 8, Figure 8 is a schematic diagram of the entire airflow path of a direct-drive permanent magnet wind power generator in an embodiment of the present invention. Passes through the air flow passage inside the stator core 8 through the dryer flow generated in the air system 12 installed in the cabin to reach the first spiral comb-shaped means 4 having the bidirectional spiral comb of the stator board panel, The flow is divided into two bifurcations. One bifurcation is to form a spiral flow of the pressure airflow toward the outside of the motor to close the poor airflow outside, and the other bifurcation is directed toward the inside of the motor A second spiral comb-shaped means (24) having a unidirectional spiral comb on the motor tower side to form humid air by passing the motor air gap to carry moisture on the motor surface (including moisture that overflows internally) .

Example 3

The present embodiment mainly introduces a sealing synergy dry control method based on Embodiments 1 and 2, which is mainly performed by detection of humidity and / or insulation resistance value, and is reasonably based on the power generation state of the wind power generator The control strategy is selected, and specifically includes the following steps.

Detecting the humidity near the groove insulation of the wind power generator and / or the position of the core lamination gap or detecting the insulation resistance value of the wind power generator winding;

If the humidity exceeds the preset humidity threshold or the insulation resistance value is lower than the insulation resistance standard value at a time when the wind farm is less than the wind or cut wind speed, the transmission switch is turned off and the power network side transmission switch is turned on, Operate;

When the wind turbine is in grid-connected power generation, the air system is activated if the humidity exceeds a predetermined humidity threshold or the insulation resistance value is less than the insulation resistance standard value.

Example 4

This embodiment mainly introduces a sealing synergy dry control method based on Embodiments 1 and 2, which is carried out by the detection of the humidity and / or insulation resistance value in the same manner and is reasonably based on the power generation state of the wind power generator The control strategy is selected, but in contrast to the third embodiment, the present embodiment is also a drawing of the weather condition as a reference factor, and specifically includes the following steps.

At the time of snow or rain,

If the wind farm is smaller than the windless or cut wind speed, turn off the power transmission switch, turn on the power network side reverse power switch and turn on the air system;

If the wind turbine is in grid-connected power generation, the air system is operated,

In times of snow and rain,

Detecting the humidity near the groove insulation of the wind power generator and / or the position of the core lamination gap or detecting the insulation resistance value of the wind power generator winding;

If the humidity exceeds the predetermined humidity threshold or the insulation resistance value is lower than the insulation resistance standard value at a time when the wind farm is less than the windless or cut wind speed, the transmission switch is turned off while the power network side transmission switch is turned on and the air system is operated ;

When the wind turbine is in grid-connected power generation, the air system is activated if the humidity exceeds a predetermined humidity threshold or the insulation resistance value is less than the insulation resistance standard value.

In addition, after the eye or the time of the rain, the air system can turn on the predetermined time zone and then perform the processing of the time zone during which the snow and the rain do not fall again. That is, the wind power generator should be forcibly dried to prevent the accumulation of moisture after the lapse of time.

In addition, in the air system, it is possible to adjust the pressure of the air system output air flow to be adapted, based on the wind speed of the wind farm and the rotation speed of the wind turbine after the operation, May be controlled.

In the foregoing, four embodiments of the present invention have been introduced. Hereinafter, important technical points, other selective methods, and technical effects of the embodiments of the present invention will be introduced again.

1. In the embodiment of the present invention, the air system is installed in the cabin of the wind power generator unit, and the dry air flow provided by the air system draws out a plurality of press-in stator brackets passing through the main pipe and connected to the generator stator bracket To provide a sufficient pressure air flow to the sealing position inside the generator in the flow path designed in the core, so that "micro static pressure closing air flow and spiral comb constitute annular barrier ".

2. The maze (comb) seal of the spiral sealing combination is combined with the pressure between the two-way spiral comb and is installed on the side of the wind-generator counter-wind annular air gap stator and has the spiral sealing combination of stator side Install the sealing ring.

3. When the wind farm is at a time less than the wind speed of no wind or cut, the power network inverter of the power generation unit inverts the power from the power network to the generator. At this time, the power network inverter assumes a rectified state, Current is transferred back to the generator stator winding to dry the groove insulation of the winding and the core lamination gap by the amount of heat generated in the stator winding. In the case where the groove portion insulation of the inner windings and the core lamination gap are dried by the amount of heat generated by the stator windings themselves and when the direction of the moisture gradient concentration gradient in the stator coincides with the direction of the temperature gradient, Shall comply with the following formula.

Flow rate in the stator = flow rate (flow-through sealing due to concentration gradient in the stator) + (flow-through sealing due to temperature difference in the stator) + (flow-through sealing due to pressure difference in the stator) The three slopes, the wet slope, the temperature slope, and the pressure gradient, are determined jointly.

 "Synergy" (this is one of the points of inventions of the sealing synergy dry) Air heat source Combining the air flow for the dry air gap for active sealing, the heat generated inside the stator winding is "eradicated" by vaporization, The wet air is pushed along the axial direction and is extruded through the tower side sealing to flow the wind power generator to the natural environment outside the wind power generator. The effect of drying the inside of the windings separately and drying them, or separately drying the inside of the air gap as air heat source dryers, does not meet their combined action, which is the "second" meaning of synergy For example, the air heat source stream described in "4" is used to prevent external rainwater, an uneven wind flow, and another for drying the inside of the motor, generating inside the windings, Including the presence of two airflows.

 The third meaning of "synergy" also indicates that the direction of the dryer flow and the direction of the rotor motion, which are drawn into the air gap position by the synergy theory requirement of the drying zone, form a single narrow angle (the amount along the circumferential direction of the dryer flow, The relative movement speed between the dryer and the rotor permanent magnet pole rustproof protective cover layer is increased to increase the friction effect and is advantageous for drying the rotor pole protection layer and cleverly uses the desiccation theory of the drying field. ).

4. In the time when the wind farm is smaller than the windless or cut wind speed, a sufficient air flow is generated between the annular gap and the comb sealing by the air heat source in the cabin, some overflow the motor out of the direct reverse wind direction, Is accumulated at the trailing end of the traction winding and extruded between the annular gap and the comb seals; In this process, one surface mass transfer drying process accomplishes convective mass transfer and convective heat exchange at the surface of the generator stator to dry the surface of the stator windings and simultaneously dry the generator pole protective layer (composite material) . Then, the water vapor is carried away together and is extinguished by the artificial pressure sealing air stream; The surface mass transfer method causes the insulation of the groove of the winding and the core lamination gap to dry, while at the same time drying the generator pole protective layer (composite material) and transferring moisture. In this process, a parallel internal mass transfer drying process occurs at the same time, and the converter DC bus bar reverses the controllable direct current to the generator stator windings, so that the heat generated in the stator windings leads to the insulation of the windings and the core lamination clearance And dried. As a fourth example of the "time control of sealing synergy dry", it is possible to remove moisture by controllable heat generated inside the stator winding, to achieve drying by convection mass transfer from the surface of the pressure sealing air stream, Heat transfer, mass transfer completes the drying purpose.

5. During the period when the wind turbine generator is grid-connected (the stator windings are generating heat), the current insulation of the generator at times when the snow is not falling. Based on the insulation resistance measurements made on the generator windings by the generator, It is determined whether or not an air heat source airflow operation is inputted. In this case, "sealing " is a combination seal and Spiralcom combines pressure sealing, i.e., the fifth instance of" time zone control of sealing synergy dry " (moisture removal by controllable heat generated in the stator winding, The sealing airflow achieves the drying by convection mass transfer on the surface and completes the drying purpose by heat transfer and mass transfer of motor stator and porous material).

6. Whether or not the air heat source work for pressure sealing has been applied based on the measured values of the air relative humidity and on-line device of the generator at the time when the wind turbine is grid- . As a sixth example of the "time control of sealing synergy dry", moisture removal by controllable heat generated inside the stator windings, drying by convection mass transfer on the surface of the pressure sealing air stream, Heat transfer, and mass transfer to complete the drying purpose.

7. Wind power generator is a grid-connected power generation system. In addition, at the time of snowfall, the open air generator for automatically opening the air heat source for pressure sealing based on the weather forecast, Gas-liquid two-phase flow " of wind and rain and a "gaseous solid two-phase flow " of wind and snow. In this case, "sealing" is a combination seal and spiralcom combines pressure sealing, ie, the seventh version of "time control of sealing synergy dry", as a result of the controllable heat generated inside the stator winding, The convection is carried out by convection mass transfer on the surface, and drying purpose is accomplished through heat transfer and mass transfer of motor stator and porous material.

8. Except for rain or snowing time, all windmills, whether windy or not, are subjected to air heat source work for pressure sealing. The length of time required for the insertion and disconnection should be determined by comparing the insulation resistance measured by the generator current insulation device to the generator winding and the insulation resistance passed value. As the eighth pattern of "time control of the sealing synergy dry", when the wind is blown, the DC current that can still be controlled by the converter DC bus bar is transmitted back to the generator stator winding, And drying of core lamination gaps, moisture removal by controllable heat generated inside the stator windings, drying by convection mass transfer on the surface of the pressure sealing flow, drying of the motor stator and porous material through heat transfer and mass transfer Complete the purpose.

9. It is also possible to adjust the pressure of the air heat source work for pressure sealing "self-adaptively" based on the current wind speed of the wind farm or generator rotation speed, while saving the power of the air heat source, It has the effect of preventing the carried reverse wind direction air flow from reaching the inside of the "sealing " motor.

10. The temperature of the sealing pressure air stream can be adjusted from the location of the air heat source so that it can adapt to the cooling needs of the wind turbine when the pressure air is working and realize the purpose of " Control "as the sixth pattern does not affect the normal cooling of the motor. As shown in FIGS. 10 and 11, the wind turbine has a natural axial cooling passage, a flow direction indicated by an arrow, and a natural cooling passage, as shown in FIG. 11, .

The scope of the present invention is not limited to the above embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims, Shall be based on the protection scope of the above-mentioned claims.

1: stator bracket 2: first stencil
3: paddle side board panel 4: first spiral comb-like means
41: first upper spiral comb 42: first lower spiral comb
5: Second pore 6: Paddle side toe plate
7: Punching fixed key 8: Stator core
9: Air flow passage 91: Axial passage
92: Radial passage 10: Tower side tongue
11: Tower side board panel 12: Air system
13: Main pipe 14: Branch pipe
15: rotor bracket 16: rotor sealing ring
17: end of the winding link 18: pole
19: rotor end cap 20: end cap sealing ring
21: comb-shaped air intake hole 211: upper air stream outlet
212: Lower air flow outlet 22: Air guide tube
23: first central comb 24: second spiral comb-like means
241: second spiral comb K1: transmission switch
K2: power transmission side power transmission switch L1: first transmission line
L2: the second transmission line

Claims (20)

A converter comprising a wind power generator, a rectifier unit, a DC busbar and an inverter unit, wherein the inverter unit is connected to a power grid and is connected to a first A direct-drive permanent magnet wind power generator system, comprising a power transmission switch provided in a transmission line and a direct-drive permanent magnet wind power generator including a stator and a rotor,
An air system, a power network side reverse current transmission switch, a switch controller and a jet sealing device,
The stator includes a stator bracket, a stator core provided on an outer peripheral wall of the stator bracket, a paddle side tooth plate, and a paddle side board panel, and the paddle side plate has a paddle side A rotor disposed in the axial direction and matching the stator, the rotor having a rotor sealing ring;
At least one first pore is provided on an outer peripheral wall of the stator bracket, and at least one second pore is provided in the paddle side plate;
The stator further comprises at least one airflow passage communicating the first pore and the second pore and passing through the interior of the stator core;
The air system communicating with the first pore;
Wherein the jet sealing device is in communication with the second pores to guide the air flow of the second pores in both directions so that one of the air flows into the annular gap formed by the paddle side board panel and the rotor sealing ring, To flow into the air gap between the stator and the rotor;
The power network side reverse transmission switch is installed in a second transmission line provided between the DC bus bar and the wind power generator;
Wherein the switch controller is connected to the air system, the transmission switch and the power network side reverse transmission switch to control on / off of the transmission switch and the power network side reverse transmission switch and on / off of the air system. Type permanent magnet wind power generator system.
The method according to claim 1,
Further comprising a humidity sensor installed in the vicinity of the groove insulation of the wind power generator and / or the core lamination gap position and connected to the switch controller,
The switch controller includes:
When the wind farm is smaller than the wind speed or the cut in wind speed, the humidity value detected by the humidity sensor is judged. When the humidity value exceeds the predetermined humidity threshold value, the transmission switch is turned off, Turning on the power transmission switch and operating the air system;
Wherein when the wind turbine is in a grid-connected power generation, the humidity value detected by the humidity sensor is determined and the air system is operated when the humidity value exceeds a predetermined humidity threshold value Direct drive permanent magnet wind power generator system.
The method according to claim 1,
Further comprising an insulation resistance value measuring device installed in the vicinity of the groove insulation of the wind power generator and / or the core lamination gap and connected to the switch controller,
The switch controller includes:
Determining the insulation resistance value detected by the insulation resistance value measuring device when the wind farm is lower than the wind speed of no wind or cut and turning off the transmission switch when the insulation resistance value is smaller than a predetermined insulation resistance standard value, Turning on the power network side reverse power transmission switch and operating the air system;
Wherein when the wind power generator is in the grid-connected power generation state, the insulation resistance value detected by the insulation resistance value measuring device is determined, and the air system is operated if the insulation resistance value is smaller than a predetermined insulation resistance standard Direct drive permanent magnet wind power generator system.
The method according to claim 1,
Wherein the jet sealing device is a first spiral comb means,
At least one comb-like air intake hole is provided on one side of the paddle-side board panel adjacent to the rotor, and the comb-shaped air intake hole and the second pore are correspondingly connected through an air-
Wherein the first spiral comb means is provided on one side of the paddle side board panel adjacent to the sealing ring of the rotor and has an annular shape as a whole and has a first spiral comb communicating with the comb air intake holes, The comb extends to an annular gap formed by the paddle side board panel and the rotor sealing ring to create a flow of air that spirals through the annular gap,
Wherein the comb-like air intake holes are located in the central portion of the first spiral comb-shaped means in the axial direction of the stator and the first spiral comb-like means comprises a first upper spiral comb and a first lower spiral comb,
The first spiral comb is located at a distance from the one side of the stator bracket about the comb-shaped air intake hole. The first spiral comb adjacent to one side of the stator bracket is the first lower spiral comb. In the cross-sectional shape of the comb, the first upper spiral comb forms an air stream that tilts in a direction away from the stator bracket, and the tilt angle of the tilt moves toward the direction away from the stator bracket, and the first lower spiral comb is close to the stator bracket Wherein the tilting angle of the tilted helical motion generates an airflow directed in a direction approaching the stator bracket.
5. The method of claim 4,
Wherein a spiral direction of the first upper spiral comb and a spiral direction of the first lower spiral comb are opposite to each other.
6. The method of claim 5,
Wherein the spiral direction of the first upper spiral comb and the rotation direction of the rotor are the same.
5. The method of claim 4,
The first spiral comb further comprising a first center comb;
Wherein the first central comb is installed in the comb-shaped air intake hole, and the airflow discharged from the comb-shaped air intake holes is classified so that a part of the airflow flows into the first upper spiral comb, So that the permanent magnet wind turbine is able to flow into the permanent magnet wind turbine.
5. The method of claim 4,
The stator further includes a tower side plate and a tower side board panel provided on an axial end surface side of the stator core on the tower side, the rotor further including an end cap sealing ring,
Wherein the second spiral comb-like means is provided with a second spiral comb, and the second spiral comb is provided on a side of the paddle side board panel adjacent to the rotor sealing ring, the second spiral comb- Wherein the fan assembly extends to an annular gap formed by the board panel and the rotor sealing ring to produce a flow of air spirally moving in the annular gap.
9. The method of claim 8,
Wherein the second spiral comb is inclined in a direction approaching the stator bracket so that an inclined angle at which the second spiral comb makes a helical motion generates an airflow directed toward a direction close to the stator bracket, Wind power generator system.
5. The method of claim 4,
Wherein the comb air intake hole and the second pore are correspondingly connected through an annular air guide pipe or a plurality of separated air guide pipes.
11. The method according to any one of claims 1 to 10,
Wherein a punching fixation key is fixed to an outer circumferential wall of the stator bracket and a dovetail groove of the stator core is installed in the punching fixture key and the air flow passage passes through the punching fixed key, Wherein the permanent magnet wind turbine system is in communication with the direct-drive permanent magnet wind power generator system.
12. The method of claim 11,
Wherein the air flow passage includes a radial air flow passage and an axial air flow passage, the radial air flow passage passes through the inside of the stator core and the punching fixed key, one end is connected to the first pore, And the axial airflow passage is communicated with the second pore through the interior of the stator core along the axial direction.
13. The method of claim 12,
Wherein the plurality of first pores, the second pores, and the plurality of the air flow passages are equal in number and are uniformly installed along the circumference, wherein a plurality of the first pores, the second pores, And a plurality of independent airflow passages extending from the outer peripheral wall of the stator bracket to the paddle side ditches are formed.
The method according to claim 1,
Wherein the air system includes an air heat source generating device for generating an air flow having a preset pressure and an air heat source processing device for performing an air heat source purifying and drying process on the air flow, .
15. The method of claim 14,
Wherein the air heat source generating apparatus is an air compressor, and the air heat source processing apparatus includes an air filter, a cooler, a water separator, and a dryer.
Detecting humidity in the vicinity of the groove insulation and / or core lamination gap position of the wind power generator or detecting the insulation resistance value of the wind power generator winding;
If the humidity exceeds a predetermined humidity threshold value or the insulation resistance value is smaller than the insulation resistance standard value in a time period when the wind farm is less than the wind speed or cut wind speed, the transmission switch is turned off and the power network side reverse transmission switch is turned on And operating the air system;
And operating the air system if the humidity exceeds a predetermined humidity threshold or the insulation resistance value is less than the insulation resistance standard value when the wind turbine is in the grid connection generation time zone. Wherein the control system is implemented by a direct-drive permanent magnet wind power generator system according to any one of claims 1 to 15. A method of controlling sealing synergy dry in a direct-drive permanent magnet wind power generator system.
When the wind farm is smaller than the no wind or cut wind speed at the time of snow or rain, the power transmission switch is turned off and the power network side reverse power transmission switch is turned on to operate the air system;
Operating the air system if the wind power generator is in the grid-connected power generation state,
Detecting humidity in the vicinity of the groove insulation of the wind power generator and / or the gap position of the core lamination or detecting the insulation resistance value of the wind power generator winding in a time when snow and rain do not fall;
If the humidity exceeds the predetermined humidity threshold or the insulation resistance value is lower than the insulation resistance standard value in a time period when the wind farm is less than the wind speed or cut wind speed, the transmission switch is turned off and the power network side reverse transmission switch is turned on Operating the air system;
Performing a processing step of operating the air system if the humidity exceeds a predetermined humidity threshold or the insulation resistance value is less than an insulation resistance standard value when the wind power generator is in a grid-connected power generation time zone A method for controlling the sealing synergy of a direct-drive permanent magnet wind power generator system, characterized in that it is carried out by a direct-drive permanent magnet wind power generator system according to any of the claims 1 to 15.
18. The method of claim 17,
Wherein the air system is turned on at a predetermined time zone after the snow or rain period, and then a processing step in a time period during which the snow and the snow are not rained is performed. .
18. The method of claim 17,
Characterized in that after operating the air system, the pressure of the air system output air stream is adjusted to be adapted based on the wind speed of the wind farm and / or the rotational speed of the wind turbine generator. Control method.
18. The method of claim 17,
Wherein the temperature of the air system output air stream is adjusted based on a cooling demand of the wind turbine after operating the air system.

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