CN110017250B - Variable-speed constant-frequency wind power generation system - Google Patents
Variable-speed constant-frequency wind power generation system Download PDFInfo
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- CN110017250B CN110017250B CN201910253433.0A CN201910253433A CN110017250B CN 110017250 B CN110017250 B CN 110017250B CN 201910253433 A CN201910253433 A CN 201910253433A CN 110017250 B CN110017250 B CN 110017250B
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- 238000010248 power generation Methods 0.000 title claims abstract description 64
- 238000005299 abrasion Methods 0.000 claims abstract description 7
- 238000004804 winding Methods 0.000 claims description 61
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 40
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 230000008859 change Effects 0.000 abstract description 11
- 230000003044 adaptive effect Effects 0.000 abstract 1
- 230000009977 dual effect Effects 0.000 description 15
- 230000006698 induction Effects 0.000 description 8
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/0272—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor by measures acting on the electrical generator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/04—Automatic control; Regulation
- F03D7/042—Automatic control; Regulation by means of an electrical or electronic controller
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
- F03D9/255—Wind motors characterised by the driven apparatus the apparatus being an electrical generator connected to electrical distribution networks; Arrangements therefor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/02—Machines with one stator and two or more rotors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Wind Motors (AREA)
Abstract
The invention discloses a variable-speed constant-frequency wind power generation system which is characterized by comprising a wind energy capturing module, a power generation module and a current transformer; the wind energy capturing module is connected with a second mechanical port of the power generation module; a first electric port of the power generation module is connected with one end of the converter, and a second electric port of the power generation module is in self-short circuit; the first mechanical port is unloaded; the other end of the converter is connected with a power grid; the power generation module is used for converting wind energy into electric energy output at constant frequency under the condition of no brush abrasion; the converter is used for converting the electric energy generated by the power generation module into the electric energy required by the power grid. The power generation module can be equivalent to two motors, and the first motor is adaptive to wind speed change; the second motor completes self-balancing of torque change; therefore, the power generation module of the invention is a brushless double-electromechanical port motor, which not only realizes the power generation with variable speed and constant frequency, but also effectively avoids the mechanical abrasion brought by the speed-up gear box and the electric brush.
Description
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a variable-speed constant-frequency wind power generation system.
Background
Wind energy is a clean energy, and the renewable energy power generation technology of wind power generation is the best choice for solving global energy. Because wind is an energy source which cannot be controlled manually, the wind generating set which operates in a variable speed mode can capture the maximum wind energy and reduce the load borne by a transmission shaft, and the frequency of the grid-connected wind driven generator is required to be consistent and constant with the power grid, namely, the variable speed constant frequency power generation of the wind generating set is realized. At present, the following two power generation systems are mainly used for realizing variable-speed constant-frequency power generation: a double-fed induction power generation system and a permanent magnet direct drive power generation system. The double-fed induction power generation system adopts a double-fed induction generator, a wind turbine is connected with a generator rotor through a speed-increasing gear, a rotor winding of the wind turbine is connected with a power converter through a slip ring, and the rotor exciting current is adjusted through the power converter, so that the output electric power constant frequency and constant voltage of the generator can be adjusted. However, the doubly-fed induction generator operates in a limited variable speed range, and the capacity of the rotor-side power converter of the doubly-fed induction generator is only a fraction of the regulated power, which is about 20% -30% of the rated power of the generator. Meanwhile, the speed-up gear box is arranged between the wind turbine and the generator, so that the cost is increased, and the system reliability and the energy conversion efficiency are reduced. The permanent magnet direct-drive power generation system adopts a low-speed direct-drive permanent magnet synchronous generator, the output of the generator is converted into constant-frequency and constant-voltage electric energy through an alternating current-direct current-alternating current power converter to be connected into a power grid, and the power generation system adopts a full-power converter, so that the power generation system has better controllability and flexibility, is simple in transmission system, high in reliability and high in system efficiency, and has the defects of large volume and weight, the need of using the full-power converter and high cost due to the adoption of the full-power converter.
Patent CN101487453 proposes a variable speed constant frequency wind power generation system and a dual rotor permanent magnet generator, which still have the problems of mechanical wear and maintenance caused by slip rings and brushes, even though a step-up gear box is eliminated, and have a great influence on the practicability and reliability of the whole system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a variable-speed constant-frequency wind power generation system which adopts a brushless double-motor electric port motor to complete the conversion from wind energy to electric energy and aims to solve the problem of mechanical abrasion caused by the existence of an electric brush and a slip ring in the conventional wind power generation system.
In order to achieve the aim, the invention provides a variable-speed constant-frequency wind power generation system which comprises a wind energy capturing module, a power generation module and a current transformer;
the wind energy capturing module is connected with a second mechanical port of the power generation module; a first electric port of the power generation module is connected with one end of the converter, and a second electric port of the power generation module is in self-short circuit; the first mechanical port is unloaded; the other end of the converter is connected with a power grid;
the wind energy capturing module is used for capturing wind energy; the power generation module is used for converting wind energy into constant-frequency electric energy without the abrasion of a brush; the converter is used for converting the electric energy generated by the power generation module into the electric energy required by the power grid.
Preferably, the wind energy capture module is a fan blade.
Preferably, the power generation module is a brushless double-motor port motor, a middle rotor of the motor has no load, and an inner rotor is connected with blades of the fan; a first winding of a motor stator is connected to a power grid through a converter, and a second winding is in self-short circuit;
specifically, the brushless dual-motor port motor comprises a first motor and a second motor, wherein the first motor is connected with a power grid; the second motor is connected with the blades of the fan.
Preferably, the brushless double-electromechanical port motor comprises a stator, a middle rotor and an inner rotor which are coaxially sleeved; the stator comprises a first magnetic conduction iron core and a stator winding, wherein the stator magnetic conduction iron core is of a tooth space structure, and the stator winding is arranged in a groove; the intermediate rotor comprises a second magnetic conduction iron core and second magnetic steel, and the second magnetic conduction iron core and the second magnetic steel of the intermediate rotor are circumferentially and alternately distributed; the surface of the inner rotor is provided with first magnetic steel distributed circumferentially. The stator winding is two electric ports of the brushless double-motor electric port motor; the inner rotor and the middle rotor are two mechanical ports of a brushless double-electromechanical port motor.
Preferably, the brushless double-electromechanical port motor comprises a stator, a middle rotor and an inner rotor which are coaxially sleeved; the stator comprises a stator magnetic conducting iron core, magnetic steel and a stator winding; the stator magnetic conductive iron core is of a tooth groove structure, a Halbach magnetic steel array is placed in a notch, and a stator winding is arranged in the groove; the surface of the inner rotor is provided with magnetic steel which is distributed circumferentially; the magnetic iron cores of the intermediate rotor are distributed circumferentially; two sets of windings of the stator are two electric ports of the brushless double-electromechanical-port motor; the inner rotor and the middle rotor are two mechanical ports of a brushless double-electromechanical port motor.
Preferably, the brushless double-electromechanical port motor comprises a stator, a middle rotor and an inner rotor which are coaxially sleeved; the stator comprises a stator magnetic conducting iron core, magnetic steel and a stator winding; the stator magnetic conductive iron core is of a tooth groove structure, a Halbach magnetic steel array is placed in a notch, and a stator winding is arranged in the groove; the surface of the inner rotor is provided with magnetic steel which is distributed circumferentially; the intermediate rotor is a magnetic conducting iron core which is distributed unevenly; two sets of windings of the stator are two electric ports of the brushless double-electromechanical-port motor; the inner rotor and the middle rotor are two mechanical ports of a brushless double-electromechanical port motor.
Preferably, the brushless double-electromechanical port motor comprises a stator, a middle rotor and an inner rotor which are coaxially sleeved; the stator comprises a stator magnetic conducting iron core and a stator winding; the stator magnetic conducting iron core is of a tooth groove structure, and a stator winding is arranged in a groove; the surface of the inner rotor is provided with magnetic steels with different circumferential distribution widths; the intermediate rotor is a magnetic conducting iron core which is uniformly distributed; two sets of windings of the stator are two electric ports of the brushless double-electromechanical-port motor; the inner rotor and the middle rotor are two mechanical ports of a brushless double-electromechanical port motor.
Preferably, a stator magnetic core of the brushless dual-electromechanical port motor is of a tooth slot structure, and the brushless dual-electromechanical port motor comprises a stator, a middle rotor and an inner rotor which are coaxially sleeved; the stator comprises a stator magnetic conducting iron core and a stator winding; the stator magnetic conducting iron core is of a tooth groove structure, and a stator winding is arranged in a groove; the surface of the inner rotor is provided with magnetic steel which is distributed circumferentially; the intermediate rotor is a magnetic conducting iron core which is distributed unevenly; two sets of windings of the stator are two electric ports of the brushless double-electromechanical-port motor; the inner rotor and the middle rotor are two mechanical ports of a brushless double-electromechanical port motor.
Preferably, the converter comprises two three-phase inverter circuits.
Specifically, under the condition that the wind speed changes, the rotating speed of the inner rotor changes due to the fact that the inner rotor is connected with blades of the fan in the second motor, the second winding is in self-short circuit, and the induced current frequency of the second motor can change along with the rotating speed of the inner rotor on the basis of the electromagnetic induction principle, so that self-adaption to the wind speed change is completed; in the first motor, the first winding is connected with a power grid through the converter, the frequency of the power grid is constant, so that the rotating speed of the first motor is constant, the torque change corresponding to the wind speed change is transmitted to the second motor through the first motor, and the second motor is used for balancing;
through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
(1) the brushless double-motor port motor is adopted to replace the traditional double-fed induction generator and the permanent magnet direct-drive synchronous generator, so that a speed-up gear box in a double-fed induction power generation system is eliminated, and mechanical abrasion caused by a slip ring and an electric brush is avoided.
(2) According to the invention, the brushless double-electromechanical port motor is adopted, when the wind speed changes, on one hand, the rotating speed of the inner rotor is adjusted according to the torque of the first motor, and meanwhile, the second winding is in self-short circuit, so that the self-adaptive process of wind speed change can be realized; on the other hand, the intermediate rotor is free of load and idles, meanwhile, the first winding is connected to a power grid through the converter, and the frequency of the power grid is fixed, so that the rotating speed of the first motor is kept unchanged, and variable-speed constant-frequency power generation is realized.
(3) The invention adopts the brushless double-motor electric port motor to electrically control the variable speed constant frequency wind power generation system, and compared with the traditional mechanical gear control, the reliability of the variable speed constant frequency power generation is higher.
Drawings
FIG. 1 is a schematic diagram of a prior art variable speed constant frequency wind power generation system;
FIG. 2 is a variable speed constant frequency wind power generation system provided by the present invention;
fig. 3 is a schematic structural view of a brushless dual electromechanical port motor provided in embodiment 1;
fig. 4 is a schematic view of a first motor of the brushless dual-motor port motor of embodiment 1;
fig. 5 is a schematic view of a second motor of the brushless dual electromechanical port motor of embodiment 1;
fig. 6 is a schematic structural view of a brushless dual electromechanical port motor provided in embodiment 2;
FIG. 7 is a schematic view of a brushless dual electromechanical port motor structure provided in embodiment 3;
FIG. 8 is a schematic view of a brushless dual electromechanical port motor structure provided in embodiment 4;
FIG. 9 is a schematic view of a brushless dual electromechanical port motor structure provided in embodiment 5;
description of the drawings:
1. blade, 2, inner rotor, 3, interrotor, 4, first electric port, 5, second electric port, 6, shorting stub, 7, stator core, 8, magnet steel, 9, converter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a variable-speed constant-frequency wind power generation device in the prior art adopts a dual-rotor permanent magnet synchronous motor to realize wind power generation, the motor is essentially two permanent magnet motors which are concentrically arranged, and permanent magnets are arranged on a middle rotor, so that an inner rotor is an armature winding, an electric brush and a slip ring of an inner motor inevitably.
In order to avoid the mechanical damage of an electric brush and a slip ring, the invention provides a variable-speed constant-frequency wind power generation system, which comprises a wind energy capturing module, a power generation module and a converter;
the wind energy capturing module is connected with a second mechanical port of the power generation module; a first electric port of the power generation module is connected with one end of the converter, and a second electric port of the power generation module is in self-short circuit; the first mechanical port is unloaded; the other end of the converter is connected with a power grid;
the wind energy capturing module is used for capturing wind energy; the power generation module is used for converting wind energy into constant-frequency electric energy without the abrasion of a brush; the converter is used for converting the electric energy generated by the power generation module into the electric energy required by the power grid.
Preferably, the wind energy capture module is a fan blade;
preferably, as shown in fig. 2, the power generation module is a brushless dual-motor port motor, and the intermediate rotor 3 of the motor idles without a load; the inner rotor 2 is directly connected with a blade 1 of the fan; a first winding 5 of the stator is connected to a power grid through a converter 9; the second winding 4 of the stator is self-short-circuited by a short-circuit wire 6.
Example 1
The brushless dual electromechanical port motor shown in fig. 3 comprises a stator, a middle rotor 3 and an inner rotor 2, which are coaxially sleeved; the stator comprises a first magnet conducting core and a stator winding, the stator magnet conducting core 7 is of a tooth space structure, stator windings are arranged in a groove and respectively comprise a winding 4 and a winding 5, and the two sets of windings form two electric ports of the brushless double-motor electric port motor; the surface of the inner rotor 2 is provided with magnetic steel 8 distributed circumferentially; the intermediate rotor 3 is formed by circumferentially and alternately distributing magnetic cores and magnetic steels 8; the inner rotor 2 and the intermediate rotor 3 are two mechanical ports of a brushless dual electromechanical port motor.
The brushless dual-motor port motor can be divided into a first motor and a second motor, wherein, as shown in fig. 4, the first motor comprises an intermediate rotor 3, a stator magnetic core 7 and a winding 5; as shown in fig. 5, the second motor comprises an inner rotor 2, an intermediate rotor 3 with magnetic steel removed and a winding 4; the first motor of fig. 4 is directly connected to the grid, and since the grid frequency of the grid is fixed, the rotation speed of the intermediate rotor is fixed; in the second motor shown in fig. 5, the rotation speed of the intermediate rotor 3 is constant, the inner rotor 2 is connected with the fan blade, when the wind speed changes, the frequency of the induced voltage in the stator winding 4 changes, and the motor part can continuously work due to the fact that the winding 4 is self-short-circuited and is similar to the principle of an induction motor; in summary, the wind energy is converted by the inner rotor of the second electrical machine into electrical energy for the windings 4 and mechanical energy for the intermediate rotor 3; the mechanical energy of the intermediate rotor 3 is converted into the electric energy of the winding 5 through the first motor, and variable-speed constant-frequency power generation is completed.
Like the machine shown in fig. 3, the following machines can also fulfill the function of the power generation module, namely: converting wind energy into electric energy to be output;
example 2
As shown in fig. 6, the brushless dual-motor port motor includes a stator, a middle rotor 3, and an inner rotor 2, which are coaxially sleeved; the stator comprises a stator magnetic conducting iron core 7, magnetic steel and a stator winding; the stator magnetic conducting iron core 7 is of a tooth groove structure, a Halbach magnetic steel array is placed in a notch, and a stator winding is arranged in a groove; magnetic steel distributed circumferentially is arranged on the surface of the inner rotor 2; the magnetic iron cores of the intermediate rotor 3 are distributed circumferentially; two sets of windings of the stator are two electric ports of the brushless double-electromechanical-port motor; the inner rotor 2 and the intermediate rotor 3 are two mechanical ports of a brushless dual electromechanical port motor.
Example 3
As shown in fig. 7, the brushless dual-motor port motor includes a stator, a middle rotor 3, and an inner rotor 2, which are coaxially sleeved; the stator comprises a stator magnetic conducting iron core 7, magnetic steel and a stator winding; the stator magnetic conducting iron core 7 is of a tooth groove structure, a Halbach magnetic steel array is placed in a notch, and a stator winding is arranged in a groove; the surface of the inner rotor 2 is provided with magnetic steel 8 distributed circumferentially; the intermediate rotor 3 is a magnetic conducting iron core which is distributed unevenly; two sets of windings of the stator are two electric ports of the brushless double-electromechanical-port motor; the inner rotor 2 and the intermediate rotor 3 are two mechanical ports of a brushless dual electromechanical port motor.
Example 4
As shown in fig. 8, the brushless dual-motor port motor includes a stator, a middle rotor 3, and an inner rotor 2, which are coaxially sleeved; the stator comprises a stator magnetic conducting iron core 7 and a stator winding; the stator magnetic conducting iron core is of a tooth groove structure, and a stator winding is arranged in a groove; magnetic steel 8 with different circumferential distribution widths is arranged on the surface of the inner rotor 2; the intermediate rotor 3 is a magnetic conducting iron core which is uniformly distributed; two sets of windings of the stator are two electric ports of the brushless double-electromechanical-port motor; the inner rotor 2 and the intermediate rotor 3 are two mechanical ports of a brushless dual electromechanical port motor.
Example 5
As shown in fig. 9, the stator magnetic core 7 of the brushless dual electromechanical port motor is in a tooth slot structure, and the brushless dual electromechanical port motor includes a stator, a middle rotor 3 and an inner rotor 2, which are coaxially sleeved; the stator comprises a stator magnetic conducting iron core and a stator winding; the stator magnetic conducting iron core is of a tooth space structure, and a stator winding 4 and a stator winding 5 are arranged in a groove; the surface of the inner rotor 2 is provided with magnetic steel 8 distributed circumferentially; the intermediate rotor 3 is a magnetic conducting iron core which is distributed unevenly; two sets of windings of the stator are two electric ports of the brushless double-electromechanical-port motor; the inner rotor 2 and the intermediate rotor 3 are two mechanical ports of a brushless dual electromechanical port motor.
Preferably, the converter comprises two three-phase inverter circuits.
Specifically, under the condition that the wind speed changes, the rotating speed of the inner rotor changes due to the fact that the inner rotor is connected with blades of the fan in the second motor, the second winding is in self-short circuit, and the induced current frequency of the second motor can change along with the rotating speed of the inner rotor on the basis of the electromagnetic induction principle, so that self-adaption to the wind speed change is completed; in the first motor, the first winding is connected with a power grid through the converter, the frequency of the power grid is constant, so that the rotating speed of the first motor is constant, the torque change corresponding to the wind speed change is transmitted to the second motor through the first motor, and the second motor is used for balancing;
it will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A variable speed constant frequency wind power generation system is characterized by comprising a wind energy capturing module, a power generation module and a current transformer;
the wind energy capturing module is connected with a second mechanical port of the power generation module; a first electric port of the power generation module is connected with one end of the converter, and a second electric port of the power generation module is in self-short circuit; the first mechanical port is unloaded; the other end of the converter is connected with a power grid;
the wind energy capturing module is used for capturing wind energy; the power generation module is used for converting wind energy into electric energy with constant frequency without brush abrasion; the converter is used for converting the electric energy generated by the power generation module into the electric energy required by the power grid;
the power generation module is a brushless double-motor port motor, a middle rotor of the motor has no load, and an inner rotor is connected with a fan blade; a first winding of a motor stator is connected to a power grid through a converter, and a second winding is in self-short circuit;
the brushless double-motor port motor comprises a stator, a middle rotor and an inner rotor which are coaxially sleeved; the stator comprises a stator magnetic conducting iron core, magnetic steel and a stator winding; the stator magnetic conductive iron core is of a tooth groove structure, a Halbach magnetic steel array is placed in a notch, and a stator winding is arranged in the groove; the surface of the inner rotor is provided with magnetic steel which is distributed circumferentially; the magnetic iron cores of the intermediate rotor are distributed circumferentially;
or the brushless double-motor port motor comprises a stator, a middle rotor and an inner rotor which are coaxially sleeved; the stator comprises a stator magnetic conducting iron core, magnetic steel and a stator winding; the stator magnetic conductive iron core is of a tooth groove structure, a Halbach magnetic steel array is placed in a notch, and a stator winding is arranged in the groove; the surface of the inner rotor is provided with magnetic steel which is distributed circumferentially; the intermediate rotor is a magnetic conducting iron core which is distributed unevenly;
or the brushless double-motor port motor comprises a stator, a middle rotor and an inner rotor which are coaxially sleeved; the stator comprises a stator magnetic conducting iron core and a stator winding; the stator magnetic conducting iron core is of a tooth groove structure, and a stator winding is arranged in a groove; the surface of the inner rotor is provided with magnetic steels with different circumferential distribution widths; the intermediate rotor is a magnetic conducting iron core which is uniformly distributed;
or the brushless double-motor port motor comprises a stator, a middle rotor and an inner rotor which are coaxially sleeved; the stator comprises a stator magnetic conducting iron core and a stator winding; the stator magnetic conducting iron core is of a tooth groove structure, and a stator winding is arranged in a groove; the surface of the inner rotor is provided with magnetic steel which is distributed circumferentially; the intermediate rotor is a magnetic conducting iron core which is not uniformly distributed.
2. The variable speed constant frequency wind power generation system of claim 1, wherein the wind energy capture module is a fan blade.
3. The variable speed constant frequency wind power generation system according to claim 1 or 2, wherein the converter comprises two three-phase inverter circuits.
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| CN201910253433.0A CN110017250B (en) | 2019-03-29 | 2019-03-29 | Variable-speed constant-frequency wind power generation system |
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