CN106870289B - Hydrostatic energy storage type hydraulic drive wind generating set and control method - Google Patents
Hydrostatic energy storage type hydraulic drive wind generating set and control method Download PDFInfo
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- CN106870289B CN106870289B CN201710193270.2A CN201710193270A CN106870289B CN 106870289 B CN106870289 B CN 106870289B CN 201710193270 A CN201710193270 A CN 201710193270A CN 106870289 B CN106870289 B CN 106870289B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000002706 hydrostatic effect Effects 0.000 title claims abstract description 17
- 230000001502 supplementing effect Effects 0.000 claims abstract description 91
- 238000010248 power generation Methods 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 239000013589 supplement Substances 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 7
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 description 22
- 238000010586 diagram Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000000819 phase cycle Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/40—Transmission of power
- F05B2260/406—Transmission of power through hydraulic systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/42—Storage of energy
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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
-
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
The invention belongs to the technical field of wind power generation control. In order to solve the problems that in the actual running process of the existing wind generating set, the generated power is unstable due to the instability of wind speed and the equipment structure is complex when a gear box structure is adopted for speed change, the invention discloses a hydrostatic energy storage type hydraulic transmission type wind generating set. The wind generating set comprises a main circulation system, a ground oil supplementing system, an energy storage system, a main oil tank, a first stop valve, a wind wheel and a generator, wherein the main circulation system comprises a hydraulic pump connected with the wind wheel and a variable motor connected with the generator. The wind generating set provided by the invention not only can stabilize the power fluctuation caused by the change of wind speed, but also can control the output rotating speed of the variable motor by adjusting the swing angle of the variable motor according to the rotating speed of the wind wheel, and stabilize the rotating speed of the generator to enable the rotating speed of the generator to be in a deviation range required by the grid-connected frequency, so that grid-connected power generation is easier to realize.
Description
Technical Field
The invention belongs to the technical field of wind power generation control, and particularly relates to a hydrostatic energy storage type hydraulic drive type wind generating set and a control method.
Background
In recent years, the world wind power industry is developed in a long term, and plays an increasingly important role in relieving energy and environmental crisis. Currently, there are two main types of wind turbine generators in actual operation: speed increasing gearbox-doubly fed generator system and direct drive-converter system.
Speed-up gear box-doubly-fed generator system, by regulating amplitude, frequency and phase sequence of exciting current of doubly-fed generator, it can ensure constant frequency and constant voltage of output electric power. Meanwhile, a vector transformation control technology is adopted, and the rotating speed of the wind wheel is adjusted by adjusting the active power of the doubly-fed generator, so that the capturing and tracking control of the maximum wind energy is realized. However, mechanical rattle occurs during a gear change operation through a speed increasing gear box, resulting in an increase in mechanical stress, ultimately leading to failure of the gear box.
Direct drive-converter systems typically employ low-speed permanent magnet synchronous generators. The rotating speed of the low-speed permanent magnet synchronous generator is rigidly coupled with the frequency of the power grid, so that when the wind speed is smaller than the cut-in wind speed or larger than the cut-out wind speed, high load and impact force are brought to the wind turbine, and the problems that the harmonic wave of the voltage of the input power grid is large, the harmonic oscillation of the power grid is easy to occur, the short-time overload cost is high and the voltage supporting capability of the power grid is weak are solved.
Disclosure of Invention
In order to solve the problems that in the actual running process of the existing wind generating set, the generated power is unstable due to the instability of wind speed and the equipment structure is complex when a gear box structure is adopted for speed change, the invention provides a hydrostatic energy storage type hydraulic drive wind generating set. The wind generating set comprises a main circulation system, a ground oil supplementing system, an energy storage system, a main oil tank, a first stop valve, a wind wheel and a generator; wherein,,
the main circulation system comprises a hydraulic pump, a variable motor, a high-pressure oil circuit, a low-pressure oil circuit, a first overflow valve, a first check valve and a second stop valve; the high-pressure oil path is positioned between an oil outlet of the hydraulic pump and an oil inlet of the variable motor; the low-pressure oil way is positioned between the oil outlet of the variable motor and the oil inlet of the hydraulic pump; the first overflow valve is positioned between the high-pressure oil way and the low-pressure oil way; the first check valve and the second stop valve are positioned on the high-pressure oil path, and the second stop valve is closer to the variable motor;
the ground oil supplementing system comprises an oil supplementing pump, an oil supplementing oil way, a second overflow valve and a third overflow valve; an oil inlet of the oil supplementing pump is connected with the main oil tank; one end of the oil supplementing oil way is connected with an oil outlet of the oil supplementing pump, and the other end of the oil supplementing oil way is connected with the low-pressure oil way; the second overflow valve is positioned between the low-pressure oil way and the oil return oil way; the third overflow valve is positioned between the oil supplementing oil way and the oil return oil way; the oil return way is connected with the main oil tank;
The energy storage system comprises a parallel energy storage device group, an energy storage oil way, a first throttle valve and a third stop valve; the parallel energy accumulator group is formed by connecting a plurality of independent energy accumulators in parallel; one end of the energy storage oil way is connected with an oil port of the parallel energy storage device group, and the other end of the energy storage oil way is connected with the high-pressure oil way and is positioned between the first check valve and the second check valve; the first throttle valve and the third stop valve are connected in parallel and are simultaneously positioned on the energy storage oil path;
the first stop valve is positioned between the oil supplementing oil way and the oil return oil way;
the wind wheel is connected with an input shaft of the hydraulic pump;
the generator is connected with the output shaft of the variable motor.
Preferably, the wind generating set further comprises a high-altitude oil supplementing system and a pressure sensor, wherein the high-altitude oil supplementing system comprises a high-altitude oil supplementing tank, a second throttle valve and a fourth stop valve; the second throttle valve and the fourth stop valve are positioned between the high-level oil supplementing tank and an oil inlet of the hydraulic pump, and the fourth stop valve adopts an electromagnetic stop valve; the pressure sensor is positioned at the oil inlet end of the hydraulic pump and is used for detecting the pressure of the oil inlet of the hydraulic pump and assisting in controlling the on-off of the fourth stop valve.
Preferably, the main circulation system further comprises a second check valve, a fourth overflow valve and a fifth stop valve; the second one-way valve is positioned at the oil inlet end of the hydraulic pump; the fifth stop valve is positioned on the high-pressure oil path and is close to the oil outlet end of the hydraulic pump; the fourth overflow valve is positioned between the high-pressure oil way and the low-pressure oil way, the oil inlet of the fourth overflow valve is positioned between the oil outlet of the hydraulic pump and the fifth stop valve, and the oil outlet is positioned between the oil inlet of the hydraulic pump and the second check valve.
Further preferably, the main circulation system further comprises a first reversing valve, a fifth overflow valve, a sixth overflow valve and a third check valve; the first reversing valve is positioned in the high-pressure oil way and is a two-position three-way reversing valve and is used for controlling connection between a first oil port and a second oil port or a third oil port, wherein the first oil port is connected with the oil outlet end of the hydraulic pump, the second oil port is connected with the oil inlet end of the variable motor, the third oil port is connected with the oil inlet end of the fifth overflow valve, the oil outlet of the fifth overflow valve is connected with the oil inlet end of the third one-way valve, and the oil outlet of the third one-way valve is connected with the low-pressure oil way and is positioned at the oil inlet end of the second one-way valve; and an oil inlet of the sixth overflow valve is positioned between the fifth overflow valve and the third one-way valve, and an oil outlet is connected with the oil return path.
Preferably, the main circulation system further comprises a second reversing valve and a fourth one-way valve; the second reversing valve is positioned in the low-pressure oil way and is a two-position three-way reversing valve and is used for controlling the connection between a first oil port and a second oil port or a third oil port, wherein the first oil port is connected with the oil outlet end of the variable motor, the second oil port is connected with the oil inlet end of the hydraulic pump, and the third oil port is connected with the high-pressure oil way and is positioned between the second stop valve and the oil inlet of the variable motor; and an oil inlet of the fourth one-way valve is connected with the main oil tank, and an oil outlet of the fourth one-way valve is connected with a third oil port of the second reversing valve.
Preferably, the main circulation system further comprises a pressure stabilizing energy accumulator, wherein the pressure stabilizing energy accumulator is located in the high-pressure oil path and is close to the oil inlet end of the first overflow valve.
Preferably, the main circulation system further comprises a speed regulating valve, and the speed regulating valve is positioned at the oil inlet of the variable motor.
A control method of the hydrostatic energy storage type hydraulic drive wind generating set,
when there is a power generation demand and the wind speed is between the cut-in wind speed and the cut-out wind speed: the first stop valve and the third stop valve are in a disconnected state, and the second stop valve and the fifth stop valve are in a communicated state; the first oil port and the second oil port of the first reversing valve and the second reversing valve are communicated, and the third oil port is closed; the oil supplementing pump is in a working state; the oil supplementing pump sucks oil from the main oil tank and conveys the oil to an oil inlet of the hydraulic pump, the hydraulic pump outputs high-pressure oil under the drive of the wind wheel, the high-pressure oil flows to the variable motor through a high-pressure oil path, the variable motor is driven to rotate so as to drive the generator to rotate to generate electric energy, an oil outlet of the variable motor outputs low-pressure oil, one part of the low-pressure oil flows to an oil inlet of the hydraulic pump through a low-pressure oil path, and the other part of the low-pressure oil flows to the main oil tank through a second overflow valve; the oil supplementing pump sucks oil from the main oil tank and conveys the oil to the low-pressure oil path through the oil supplementing oil path;
When there is a need for power generation, but the wind speed is less than the cut-in wind speed or greater than the cut-out wind speed: the first stop valve and the second stop valve are in a communication state, and the third stop valve and the fourth stop valve are in a disconnection state; the first oil port and the second oil port of the second reversing valve are communicated, and the third oil port is closed; the oil supplementing pump is in a stop state; the high-pressure oil liquid in the parallel accumulator group enters the high-pressure oil way through the energy storage oil way and the first throttle valve, enters the variable motor after passing through the second stop valve and the speed regulating valve, drives the variable motor to rotate so as to drive the generator to rotate to generate electric energy, and the oil outlet of the variable motor outputs low-pressure oil liquid which flows to the main oil tank through the second reversing valve and the first stop valve;
when there is no power generation demand, but the wind speed is between the cut-in wind speed and the cut-out wind speed: the first stop valve and the second stop valve are in a disconnected state, and the third stop valve, the fourth stop valve and the fifth stop valve are in a communicated state; the first oil port of the first reversing valve is connected with the second oil port, the third oil port is closed, the first oil port of the second reversing valve is connected with the third oil port, and the second oil port is closed; the oil supplementing pump is in an operating state; the oil supplementing pump sucks oil from a main oil tank and conveys the oil to an oil inlet of the hydraulic pump, meanwhile, the oil in the high-level oil supplementing tank supplements the oil to the oil inlet of the hydraulic pump through a second throttle valve and a fourth stop valve, the hydraulic pump outputs high-pressure oil under the drive of a wind wheel, and the high-pressure oil sequentially flows into the parallel accumulator group through a fifth stop valve, a first reversing valve and a third stop valve to store the high-pressure oil; when the oil pressure in the high-pressure oil way exceeds the set pressure value of the first overflow valve, high-pressure oil flows to the main oil tank through the first overflow valve and the second overflow valve;
When the wind generating set is parked normally, the wind generating set is stopped normally: the first stop valve, the second stop valve, the third stop valve and the fourth stop valve are in a disconnected state, and the fifth stop valve is in a connected state; the first oil port and the third oil port of the first reversing valve and the second reversing valve are connected, and the second oil port is closed; the oil supplementing pump is in an operating state; the hydraulic pump outputs high-pressure oil under the drive of the wind wheel, the high-pressure oil flows to the hydraulic pump again after passing through a fifth stop valve, a first reversing valve, a fifth overflow valve, a third one-way valve and a second one-way valve to form a closed loop system, part of the high Wen Youye flowing through the fifth overflow valve flows to a main oil tank through a sixth overflow valve, and meanwhile, the oil supplementing pump supplements oil to the oil inlet end of the hydraulic pump; oil flowing out of an oil outlet of the variable motor flows into the variable motor again after passing through the second reversing valve and the speed regulating valve to form a closed loop system, and meanwhile, the oil is supplemented into the closed loop system from the main oil tank through the fourth one-way valve;
when the wind generating set needs emergency stop, the following steps are carried out: the first stop valve and the fourth stop valve are in a communication state, and the second stop valve, the third stop valve and the fifth stop valve are in a closed state; the first oil port of the first reversing valve is connected with the second oil port, the third oil port is closed, the first oil port of the second reversing valve is connected with the third oil port, and the second oil port is closed; the oil supplementing pump is in a stop state; the hydraulic pump outputs high-pressure oil under the drive of the wind wheel, the high-pressure oil flows through the fourth overflow valve and then flows to the hydraulic pump again to form a closed system, and meanwhile, the high-position oil supplementing box supplements the oil to the oil inlet end of the hydraulic pump through the second throttle valve and the fourth stop valve; the oil flowing out of the oil outlet of the variable motor flows into the variable motor again after passing through the second reversing valve and the speed regulating valve to form a closed loop system, and meanwhile, the oil is supplemented into the closed loop system from the main oil tank through the fourth one-way valve.
Preferably, when there is a power generation requirement and the wind speed is between the cut-in wind speed and the cut-out wind speed, and when there is no power generation requirement and the wind speed is between the cut-in wind speed and the cut-out wind speed, the pressure sensor monitors the pressure of the oil inlet of the hydraulic pump in real time, when the pressure of the oil inlet is detected to be lower than the lowest suction pressure of the hydraulic pump, the fourth stop valve enters a communicating state, and the oil in the high-level oil supplementing tank supplements the oil inlet of the hydraulic pump; when the oil inlet pressure is higher than the lowest suction pressure of the hydraulic pump, the fourth stop valve is in a closed state.
The hydrostatic energy storage type hydraulic drive type wind generating set for wind power generation has the following beneficial effects:
1. according to the invention, a hydraulic transmission technology is introduced into a wind generating set, a hydraulic pump is directly driven by a wind wheel to output high-pressure oil, then a variable motor is driven by the high-pressure oil to output rotating speed, and finally a generator is driven to rotate for generating electricity. In the normal working process of the wind generating set, the self-swing angle of the variable motor is adjusted to change the displacement of the variable motor according to the change of the rotation speed of the wind wheel, so that the output rotation speed of the variable motor is controlled, and the rotation speed of the generator is stabilized. Meanwhile, through the cooperation of the speed regulating valve, the flow entering the variable motor is throttled, so that the variable motor speed is accurately regulated to enable the variable motor speed to tend to the power frequency speed, and the variable motor speed reaches the deviation range required by the grid-connected frequency, thereby omitting a gear box and a converter in the existing wind generating set and reducing the weight of a cabin. And the variable motor and the generator are arranged on the ground and are connected with the hydraulic pump fixed on the frame by virtue of the oil pipeline, so that the hoisting of the variable motor and the generator can be omitted, and the installation and the maintenance of the wind generating set are facilitated.
2. According to the invention, the energy storage system is arranged, so that when wind energy is abundant, the energy storage system stores and collects high-pressure oil liquid output by the hydraulic pump driven by the wind wheel, and when wind energy is insufficient, the energy storage system is used as an independent power source or an auxiliary power source to output energy to drive the variable motor to drive the generator to generate electricity. Therefore, not only can wind energy be utilized more efficiently, but also continuous power generation of the wind generating set in a short time can be realized when no wind exists and power is required, and time is strived for scheduling of a power grid.
3. When the hydrostatic energy storage type hydraulic drive wind generating set is adopted for stopping operation, firstly, the rotation speed of the wind wheel is greatly reduced by means of the operation of changing the blade pitch or throwing out the blade tip spoiler; then, the hydraulic pump and the variable motor are separated through the stop valve and the reversing valve, the hydraulic pump and the variable motor form respective circulation systems, and the rotation speeds of the hydraulic pump and the variable motor are gradually reduced to zero through the self-circulation systems of the hydraulic pump and the variable motor, so that the hydraulic braking effect is achieved; and finally, braking a transmission shaft between the wind wheel and the hydraulic pump by means of a brake disc to finish the stopping operation. Because the wind generating set omits a gear box, if a brake disc is directly adopted to mechanically brake a low-rotation-speed large-torque wind wheel, a large-size brake disc is needed to realize braking operation, and harmful impact load can be generated in the process, so that equipment is damaged. Therefore, by adopting the method of combining the hydraulic braking and the mechanical braking, the wind generating set provided by the invention not only can reduce the braking force in the mechanical braking process, reduce the impact load and improve the working safety and the service life of equipment, but also can reduce the size requirement on a brake disc, further lighten the weight of a cabin and reduce the complexity of the wind generating set.
Drawings
FIG. 1 is a schematic diagram of the overall system of a hydrostatic energy storage type hydraulic drive wind turbine generator system of the present invention;
FIG. 2 is a schematic diagram of a system in which the wind turbine of the present invention operates when there is a demand for power generation and the wind speed is between the cut-in wind speed and the cut-out wind speed;
FIG. 3 is a schematic diagram of a system for operating a wind turbine of the present invention when there is a demand for power generation but the wind speed is less than the cut-in wind speed or greater than the cut-out wind speed;
FIG. 4 is a schematic diagram of a system in which the wind turbine of the present invention operates when there is no demand for power generation but the wind speed is between the cut-in wind speed and the cut-out wind speed;
FIG. 5 is a schematic diagram of a system in which the wind turbine of the present invention is operating when the wind turbine is parked normally;
FIG. 6 is a schematic diagram of a system in which a wind turbine of the present invention operates when an emergency stop is required.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the hydrostatic energy storage type hydraulic drive wind generating set comprises a main circulation system 1, a ground oil supplementing system 2, an energy storage system 3, a main oil tank 4, a first stop valve 5, a wind wheel 6 and a generator 7.
The main circulation system 1 is a closed hydraulic system, and includes a hydraulic pump 101, a variable displacement motor 102, a high-pressure oil passage 103, a low-pressure oil passage 104, a first relief valve 105, a first check valve 106, and a second check valve 107. The high-pressure oil path 103 is located between the oil outlet of the hydraulic pump 101 and the oil inlet of the variable displacement motor 102, and the low-pressure oil path 104 is located between the oil outlet of the variable displacement motor 102 and the oil inlet of the hydraulic pump 101. The first relief valve 105 is located between the high pressure oil line 103 and the low pressure oil line 104, the first check valve 106 and the second shut-off valve 107 are located on the high pressure oil line 103, and the second shut-off valve 107 is closer to the variable displacement motor 102.
Preferably, the oil outlet end of the hydraulic pump 101 and the oil outlet end of the variable displacement motor 102 are respectively provided with a pressure flow sensor 81, which are respectively used for detecting the pressure and flow of the oil in the high pressure oil path 103 and the low pressure oil path 104, and are converted into current signals to be transmitted to the control system, so that the remote monitoring of the main circulation system 1 is realized.
The ground oil supplementing system 2 comprises an oil supplementing pump 201, an oil supplementing oil path 202, a second overflow valve 203 and a third overflow valve 204. The oil inlet of the oil supplementing pump 201 is connected with the main oil tank 4, the oil outlet is provided with a filter for improving the cleanliness of oil in the main circulation system 1, and a one-way valve for preventing hydraulic impact in the main circulation system 1 from causing impact damage to the oil supplementing pump 201. One end of the oil supplementing oil way 202 is connected with an oil outlet of the 201 oil supplementing pump, and the other end is connected with the low-pressure oil way 104. The second relief valve 203 is located between the low-pressure oil passage 104 and the return oil passage 401. Third relief valve 204 is located between makeup oil path 202 and return oil path 401. The oil return passage 401 is connected to the main tank 4. Preferably, the oil compensating pump 201 adopts a variable pump structure, so that when the inlet pressure of the hydraulic pump 101 is unstable, the discharge capacity of the oil compensating pump 201 can be properly increased to improve the flow rate of the oil fed into the low-pressure oil channel 104, thereby avoiding the phenomenon of suction of the hydraulic pump 101.
The energy storage system 3 comprises a parallel accumulator group 301, an energy storage oil circuit 302, a first throttle valve 303 and a third stop valve 304. The parallel accumulator group 301 is formed by connecting a plurality of independent accumulators in parallel, and a stop valve is arranged at the oil port of each accumulator, so that the disassembly, assembly and maintenance of the single accumulator can be conveniently carried out without affecting the normal operation of the parallel accumulator group 301. In addition, the energy storage system 3 is directly placed and installed on the ground, so that the energy storage system 3 can be conveniently disassembled and assembled. One end of the energy storage oil path 302 is connected with an oil port of the parallel energy storage device 301, and the other end of the energy storage oil path 302 is connected with the high-pressure oil path 103 and is positioned between the first check valve 106 and the second check valve 107, so that oil output by the parallel energy storage device 301 can only flow to the variable motor 102 through the second check valve 107 after entering the high-pressure oil path 103. The first throttle valve 303 and the third stop valve 304 are connected in parallel and are simultaneously located on the accumulator oil passage 302.
When the parallel accumulator group 301 is subjected to high-pressure oil storage, that is, high-pressure oil enters the energy storage system 3 from the high-pressure oil path 103, the third stop valve 304 is in a communication state, so that the high-pressure oil can quickly enter the accumulator through the third stop valve 304, and the storage of the high-pressure oil can be quickly completed with low loss. When the high-pressure oil in the parallel accumulator group 301 is released, that is, the high-pressure oil enters the high-pressure oil path 103 from the energy storage system 3, the third stop valve 304 is in a closed state and opens the first throttle valve 303, so that the stored high-pressure oil enters the high-pressure oil path 103 through the first throttle valve 303, and thus, the release speed of the high-pressure oil can be controlled and stabilized by adjusting the opening amount of the first throttle valve 303, and flow fluctuation and hydraulic impact generated in the release process of the high-pressure oil are reduced.
In addition, pressure and flow sensors 81 are respectively disposed at the oil port position of the parallel accumulator group 301 and the oil port end of the first throttle 303 near the high-pressure oil line 103, and are respectively used for collecting and detecting the pressure and flow of the oil entering the parallel accumulator group 301 and the pressure and flow of the oil entering the high-pressure oil line 103 through the first throttle 303, and are used as reference values for adjusting the swing angle of the variable motor 102. In addition, a safety valve 305 is provided at the oil port of the parallel accumulator group 301, for limiting the highest pressure of the stored oil in the parallel accumulator group 301.
The first stop valve 5 is located between the oil supplementing oil path 202 and the oil return oil path 401, and when the first stop valve 5 is in a communicating state, the oil supplementing oil path 202 and the low-pressure oil path 104 are directly communicated with the main oil tank 4, so that quick oil draining operation can be performed on the oil in the oil supplementing oil path 202 and part of the low-pressure oil path 104.
The wind wheel 6 is connected with an input shaft of a hydraulic pump 101, the generator 7 is connected with an output shaft of a variable displacement motor 102, the generator 7 and the variable displacement motor 102 are directly installed on the ground, and the variable displacement motor 102 is connected with the hydraulic pump 101 in a cabin above the tower through an oil pipeline. This allows both the size and weight of the nacelle to be reduced and the lifting operations on the variable displacement motor 102 and the generator 7 to be omitted. In addition, a speed sensor 82 is provided at the end face position of the wind wheel 6 for detecting the rotational speed of the wind wheel 6. A rotation speed sensor 83 is provided at the position of the input shaft of the hydraulic pump 101 and the output shaft of the variable displacement motor 102, and detects the rotation speed of the transmission shaft. Thus, the running conditions of the wind wheel 6 and the generator 7 can be remotely monitored in real time, and problems can be timely found. In the present invention, the generator 7 is a field synchronous generator.
Preferably, the wind power generator set further comprises a high-altitude oil supply system 9 and a pressure sensor 84. The high-altitude oil supply system 9 includes a high-altitude oil supply tank 901, a second throttle valve 902, and a fourth shutoff valve 903. Wherein the second throttle valve 902 and the fourth stop valve 903 are connected in series, between the high-order tank 901 and the oil inlet of the hydraulic pump 101, and the fourth stop valve 903 adopts an electromagnetic stop valve. The pressure sensor 84 is located at the oil inlet end of the hydraulic pump 101 and is used for detecting the oil inlet pressure of the hydraulic pump 101. In this way, when the pressure sensor 84 detects that the pressure of the oil inlet of the hydraulic pump 101 is lower than the lowest oil inlet pressure of the hydraulic pump 101, a control signal is sent to switch the fourth stop valve 903 to the communication state, and the oil in the high-level oil compensating tank 901 flows into the low-pressure oil path 104 through the second throttle valve 902 and the fourth stop valve 903 under the action of the atmospheric pressure, so as to timely compensate the oil inlet of the hydraulic pump 101. Further, by adjusting the opening amount of the second throttle valve 902, the oil replenishment speed can be controlled. In addition, in the invention, the high-altitude oil supplementing system 9 and the hydraulic pump 101 are simultaneously positioned in the engine room above the tower, so that the timeliness and rapidness of supplementing oil to the hydraulic pump 101 can be improved, meanwhile, the along-distance loss in the oil supplementing process is reduced, and the pressure stability of the supplemented oil is ensured.
Preferably, the main circulation system 1 further comprises a second check valve 108, a fourth overflow valve 109 and a fifth shut-off valve 110. Wherein the second check valve 108 is located at the oil inlet end of the hydraulic pump 101. The fifth shut-off valve 110 is located on the high-pressure oil line 103 near the oil outlet end of the hydraulic pump 101. The fourth overflow valve 109 is located between the high pressure oil line 103 and the low pressure oil line 104, and the oil inlet of the fourth overflow valve 109 is located between the oil outlet of the hydraulic pump 101 and the fifth shut-off valve 110, and the oil outlet is located between the oil inlet of the hydraulic pump 101 and the second check valve 108.
Preferably, the main circulation system 1 further includes a first reversing valve 111, a fifth relief valve 112, a sixth relief valve 113, and a third check valve 114. The first reversing valve 111 is located in the high-pressure oil path 103, and adopts a two-position three-way reversing valve structure, and is used for controlling the connection of the first oil port and the second oil port or the connection of the first oil port and the third oil port. The first oil port of the first reversing valve 111 is connected with the oil outlet end of the hydraulic pump 101, the second oil port is connected with the oil inlet end of the variable displacement motor 102, and the third oil port is connected with the oil inlet of the fifth overflow valve 112. An oil outlet of the fifth relief valve 112 is connected to an oil inlet of the third check valve 114. An oil outlet of the third check valve 114 is connected to the low pressure oil line 104 and is located at an oil inlet end of the second check valve 108. An oil inlet of the sixth overflow valve 113 is located between the fifth overflow valve 112 and the third check valve 114, and an oil outlet is directly connected with the oil return path 401.
Preferably, the main circulation system 1 further comprises a second reversing valve 115 and a fourth one-way valve 116. The second reversing valve 115 is located in the low-pressure oil path 104 and adopts a two-position three-way reversing valve structure for controlling the connection of the first oil port and the second oil port or the connection of the first oil port and the third oil port. The first oil port of the second reversing valve 115 is connected to the oil outlet end of the variable displacement motor 102, the second oil port is connected to the oil inlet end of the hydraulic pump 101, and the third oil port is connected to the high-pressure oil path 103 and is located between the second stop valve 107 and the oil inlet of the variable displacement motor 102. The oil inlet of the fourth one-way valve 116 is connected with the main oil tank 4, and the oil outlet is connected with the third oil port of the second reversing valve 115.
Preferably, the main circulation system 1 further comprises a pressure stabilizing accumulator 117. A pressure stabilizing accumulator 117 is located in the high pressure oil line 103 and near the oil inlet end of the first relief valve 105. In this way, when the output oil of the hydraulic pump 101 has flow pulsation and hydraulic impact due to unstable rotation speed of the wind wheel 6, the flow pulsation and the hydraulic impact can be quickly absorbed and stabilized in time by the pressure stabilizing accumulator 117, so that the oil flowing to the variable motor 102 can be kept stable, the output rotation speed of the variable motor 102 can be stabilized, and the power fluctuation of the generator 7 can be reduced.
Preferably, the main circulation system 1 further includes a fifth check valve 118 and is located on the low pressure oil passage 104 between the oil outlet of the variable motor 102 and the oil supplementing oil passage 202. And the oil supplementing pump is used for preventing the oil supplementing pump 201 from outputting oil supplementing liquid from entering the low-pressure oil circuit 104 and directly flowing to the hydraulic motor 102, so that the normal operation of the hydraulic motor 102 is prevented from being influenced.
Preferably, the main circulation system 1 further comprises a speed valve 119 and is located at the oil inlet of the variable displacement motor 102. The control of the actual output rotation speed of the variable motor 102 is realized by controlling the flow entering the variable motor 102 through the speed regulating valve 119 and adjusting the swing angle of the variable motor 102. Firstly, setting the self-swing angle of the variable motor 102, and determining the output rotating speed range of the variable motor 102; then, the opening amount of the speed regulating valve 119 is regulated, and the actual flow entering the variable motor 102 is controlled, so that the final output rotating speed of the variable motor 102 is controlled, the rotating speed control of the generator 7 is realized, the power frequency rotating speed tends to be the power frequency rotating speed, the generator 7 can be directly connected with a grid for power generation, and a converter and a complex control circuit are omitted.
In the present invention, the first stop valve 5, the second stop valve 107, the third stop valve 304, the fourth stop 903, and the fifth stop valve 110 each have an electromagnetic stop valve structure, and the first relief valve 105, the fourth relief valve 109, and the fifth relief valve 112 each have a proportional relief valve structure. Therefore, the hydraulic elements can be remotely controlled through the remote current control signals, so that the wind generating set can be rapidly and accurately controlled and automatically controlled. The maximum set pressure of the first overflow valve 105 is 30MPa for the 600KW wind generating set, and the maximum set pressure is used for limiting the maximum pressure of oil in the high-pressure oil circuit 103, so that the operation safety of the main circulation system 1 is protected. The second relief valve 203 and the sixth relief valve 113 are set to 1.5MPa, respectively, for draining the high Wen Youye in the system to the main tank 4 and reducing the oil temperature in the system. The third relief valve 204 is set to 2MPa for limiting the oil pressure output from the oil supplementing pump 201. The highest pressures set for the fourth relief valve 109 and the fifth relief valve 112 are 30MPa, respectively, and the pressure set values are increased by gradual adjustment when used as loads, thereby adjusting the pressure loads of the respective oil passages.
The control method of the hydrostatic energy storage type hydraulic drive type wind generating set comprises the following steps:
when there is a demand for power generation, and the wind speed is between the cut-in wind speed and the cut-out wind speed. The wind speed condition meets the normal operation of the wind generating set, and the ground oil supplementing system 2 assists the main circulation system 1 to work.
As shown in fig. 1 and 2, the first stop valve 5 and the third stop valve 304 are in the disconnected state, the second stop valve 107 and the fifth stop valve 110 are in the connected state, the first oil port and the second oil port of the first reversing valve 111 and the second reversing valve 115 are communicated, the third oil port is closed, and the oil supplementing pump 201 is in the working state. Thus, a complete closed hydraulic system is formed between the high pressure oil passage 103 and the low pressure oil passage 104. At this time, the hydraulic pump 101 outputs high-pressure oil under the driving of the wind wheel 6, the high-pressure oil flows to the variable motor 102 through the high-pressure oil path 103, and sequentially passes through the fifth stop valve 110, the first reversing valve 111, the first check valve 106, the second stop valve 107 and the speed regulating valve 119 during the period, so as to drive the variable motor 102 to rotate, and further drive the generator 7 to rotate to generate electric energy. The oil outlet of the variable displacement motor 102 outputs low-pressure oil, and after passing through the second reversing valve 115, one part of the low-pressure oil passes through the fifth check valve 118 and the second check valve 108 and then flows to the oil inlet of the hydraulic pump 101, and the other part of the low-pressure oil passes through the second overflow valve 203 and then flows to the main oil tank 4. Further, the oil replenishment pump 201 sucks in oil from the main tank 4 and feeds the oil to the low-pressure oil passage 104 through the oil replenishment passage 202. In this way, a part of the high pressure Wen Youye is returned to the main tank 4 by the second relief valve 203, and the low-temperature oil is refilled into the low-pressure oil passage 104 by the refill pump 201, thereby controlling the oil temperature of the main circulation system 1.
Preferably, in this process, the pressure sensor 84 monitors the pressure of the oil inlet of the hydraulic pump 101 in real time, and when the pressure of the oil inlet is lower than the lowest pressure of the hydraulic pump 101, the fourth stop valve 903 is in a communication state, and the oil in the high-level oil supplementing tank 901 supplements the oil in time to the oil inlet of the hydraulic pump 101; when the oil inlet pressure is higher than the lowest oil inlet pressure of the hydraulic pump 101, the fourth cutoff valve 903 is in a closed state. This can avoid the problem of suction of the hydraulic pump 101 due to insufficient oil being supplied when the oil supplementing pump 201 is in trouble.
When there is a demand for power generation, but the wind speed is less than the cut-in wind speed or greater than the cut-out wind speed. The wind wheel 6 enters a stop state to stop rotating, and the energy storage system 3 is used as a power unit to maintain the normal power generation of the generator 7.
As shown in fig. 1 and 3, the first stop valve 5 and the second stop valve 107 are in a communication state, the third stop valve 304 and the fourth stop valve 903 are in a disconnection state, the first oil port and the second oil port of the second reversing valve 115 are in communication, the third oil port is closed, and the oil supplementing pump 201 is in a stop state. At this time, the high-pressure oil passage 103 is shut off by the first check valve 106, and the low-pressure oil passage 104 is directly connected to the main tank 4 by the first shutoff valve 5. Thus, an open hydraulic system is formed by the energy storage system 3 as a power unit, the variable motor 102 as an execution unit and the main oil tank 4 as an oil return tank. The high-pressure oil stored in the parallel accumulator group 301 enters the high-pressure oil path 103 through the energy storage oil path 302 and the first throttle valve 303, flows through the second stop valve 107 and the speed regulating valve 119, then enters the variable motor 102, drives the variable motor 102 to rotate, and further drives the generator 7 to rotate to generate electric energy. The oil outlet of the variable displacement motor 102 outputs low-pressure oil, and the low-pressure oil flows to the main oil tank 4 after passing through the second reversing valve 115, the fifth check valve 118 and the first stop valve 5.
When there is no power generation demand, but the wind speed is between the cut-in wind speed and the cut-out wind speed. The wind speed condition meets the running of the wind wheel 6 and can drive the hydraulic pump 101 to output high-pressure oil, so that the energy storage system 3 stores the high-pressure oil output by the hydraulic pump 101.
As shown in fig. 1 and 4, the first shut-off valve 5 and the second shut-off valve 107 are in the open state, and the third shut-off valve 304 and the fifth shut-off valve 110 are in the connected state. The first oil port of the first reversing valve 111 is connected with the second oil port, the third oil port is closed, the first oil port of the second reversing valve 115 is connected with the third oil port, the second oil port is closed, and the oil supplementing pump 201 is in an operating state. At this time, the high-pressure oil passage 103 is shut off by the second shutoff valve 107, and the low-pressure oil passage 104 is shut off by the second directional valve 115, so that the variable displacement motor 102 is isolated. The oil supplementing pump 201 sucks oil from the main oil tank 4, conveys the oil to the oil inlet end of the hydraulic pump 101 through the oil supplementing oil way 202 and the second one-way valve 108, and the hydraulic pump 101 outputs high-pressure oil under the drive of the wind wheel 6, and flows to the parallel accumulator 301 for storing the high-pressure oil after sequentially passing through the fifth stop valve 110, the first reversing valve 111, the first one-way valve 106 and the third stop valve 304. Wherein when the oil pressure in the high-pressure oil passage 103 exceeds the set pressure value of the first relief valve 105, the high-pressure oil flows to the main tank 4 through the first relief valve 105 and the second relief valve 203. At this time, the oil pressure at the oil outlet end of the fifth check valve 118 is greater than the oil pressure at the oil inlet end, and thus is always in the closed state. In addition, if the stroke speed suddenly decreases and the magnitude of the decrease is large in this process, in order to avoid the hydraulic shock occurring in the high-pressure oil path and affect the hydraulic pump 101 and the wind wheel 6, it is necessary to appropriately decrease the pressure value of the first relief valve 105 and thus appropriately release the pressure of the oil in the high-pressure oil path 103. When the wind speed is restored to be stable, the pressure value of the first overflow valve 105 is gradually adjusted to be the safe pressure value of the system.
In addition, in the process, the discharge capacity of the oil compensating pump 201 is adjusted, the pressure sensor 84 is used for checking the pressure of the oil inlet of the hydraulic pump 101, the on-off of the fourth stop valve 903 is controlled, and then the oil compensating operation is performed on the hydraulic pump 101 by means of the high-position oil compensating tank 901, so that the phenomenon of suction of the oil inlet of the hydraulic pump 101 is avoided, and the normal work of the hydraulic pump 101 is ensured.
When the wind generating set normally stops, firstly, the rotation speed of the wind wheel 6 is greatly reduced by means of the operation of blade pitching or blade tip spoiler throwing out, then the hydraulic pump 101 and the variable motor 102 are subjected to deceleration operation, the rotation speeds of the wind wheel 6 and the generator 7 are reduced to zero, and finally, the mechanical stop is carried out by means of the braking equipment. Among them, in the deceleration operation of the hydraulic pump 101 and the variable displacement motor 102, it is required to avoid the occurrence of hydraulic shock and suction phenomenon.
As shown in fig. 1 and 5, the first stop valve 5, the second stop valve 107, the third stop valve 304, and the fourth stop valve 903 are in the disconnected state, the fifth stop valve 110 is in the connected state, the first oil port and the third oil port of the first reversing valve 111 and the second reversing valve 115 are connected, the second oil port is closed, and the oil supplementing pump 201 is in the operating state. Thus, the main circulation system 1 is divided into two parts by the first reversing valve 111, the second stop valve 107, the fifth check valve 118 and the second reversing valve 115, and one part is the large circulation system of the hydraulic pump 101 and is supplemented with oil by the oil supplementing pump 201; the other part is a self-circulation system of the variable displacement motor 102, and self-supplements oil from the main tank 4. The hydraulic pump 101 outputs high-pressure oil under the drive of the wind wheel 6, and the high-pressure oil flows to the hydraulic pump 101 again after passing through the fifth stop valve 110, the first reversing valve 111, the fifth overflow valve 112, the third one-way valve 114 and the second one-way valve 108, so as to form a closed loop system. Wherein a part of the height Wen Youye flowing through the fifth relief valve 112 flows to the main tank 4 through the sixth relief valve 113, and the oil supplementing pump 201 supplements the oil to the oil inlet end of the hydraulic pump 101. In this way, the set pressure value of the fifth relief valve 112 is adjusted in real time from the zero pressure, so that the pressure load in the large circulation system of the hydraulic pump 101 is gradually increased, thereby realizing the deceleration operation of the hydraulic pump 101. Oil flowing out of an oil outlet of the variable motor 102 flows into the variable motor 102 again after passing through the second reversing valve 115 and the speed regulating valve 119 to form a closed loop system, and meanwhile, oil is supplemented into the closed loop system from the main oil tank 4 through the fourth one-way valve 116, so that the phenomenon of suction in the deceleration and parking process of the variable motor 102 is avoided. In addition, in order to prevent the high-pressure oil in the high-pressure oil line 103 from flowing to the oil outlet end of the variable motor 102 through the second direction valve 115 to affect the variable motor 102, a check valve may be provided between the third oil port of the second direction valve 115 and the high-pressure oil line 103, thereby preventing the high-pressure oil from flowing to the oil outlet end of the variable motor 102 through the second direction valve 115.
When the wind turbine generator system needs to be suddenly stopped, for example, when the hydraulic system fails to cause the hydraulic pump to suck oil insufficiently, the hydraulic pump 101 is required to be stopped quickly, and the hydraulic shock and the suction phenomenon are required to be avoided.
As shown in fig. 1 and 6, the fourth stop valve 903 is in a communication state, the second stop valve 107, the third stop valve 304, and the fifth stop valve 110 are in a closed state, the first oil port and the third oil port of the second reversing valve 115 are connected, the second oil port is closed, and the oil supplementing pump 201 is in a stop state. In this way, the main circulation system 1 is divided into two parts by the fifth stop valve 110, the second stop valve 107, the second check valve 108 and the second reversing valve 115, and one part is a small circulation system of the hydraulic pump 101 and is supplemented with oil by the high-level oil supplementing system 9; the other part is a self-circulation system of the variable displacement motor 102, and self-supplements oil from the main tank 4. The hydraulic pump 101 outputs high-pressure oil under the drive of the wind wheel 6, and the high-pressure oil flows through the fourth overflow valve 109 and then flows to the hydraulic pump 101 again to form a closed hydraulic system. The set pressure value of the fourth overflow valve 109 is adjusted in real time from zero pressure, so that the pressure load in the small circulation system of the hydraulic pump 101 is gradually increased, and the deceleration stop operation of the hydraulic pump 101 is realized. Meanwhile, under the action of atmospheric pressure, the oil in the high-level oil supplementing tank 901 supplements the oil to the oil inlet end of the hydraulic pump 101 through the second throttle valve 902 and the fourth stop valve 903. Thus, by shortening the length of the oil path of the circulation system and rapidly supplementing the oil liquid through the high-level oil supplementing system 9, the rapid stop operation of the hydraulic pump 101 is realized. The variable displacement motor 102 is identical to the normal shutdown process and will not be repeated here. In addition, the first stop valve 5 is in a communication state, so that the oil in the oil supplementing oil path 202 and part of the low-pressure oil path 104 can be rapidly drained into the main oil tank 4 through the first stop valve 5.
Claims (7)
1. The hydrostatic energy storage type hydraulic transmission type wind generating set is characterized by comprising a main circulation system, a ground oil supplementing system, an energy storage system, a main oil tank, a first stop valve, a wind wheel and a generator; wherein,,
the main circulation system comprises a hydraulic pump, a variable motor, a high-pressure oil circuit, a low-pressure oil circuit, a first overflow valve, a first check valve and a second stop valve; the high-pressure oil path is positioned between an oil outlet of the hydraulic pump and an oil inlet of the variable motor; the low-pressure oil way is positioned between the oil outlet of the variable motor and the oil inlet of the hydraulic pump; the first overflow valve is positioned between the high-pressure oil way and the low-pressure oil way; the first check valve and the second stop valve are positioned on the high-pressure oil path, and the second stop valve is closer to the variable motor;
the ground oil supplementing system comprises an oil supplementing pump, an oil supplementing oil way, a second overflow valve and a third overflow valve; an oil inlet of the oil supplementing pump is connected with the main oil tank; one end of the oil supplementing oil way is connected with an oil outlet of the oil supplementing pump, and the other end of the oil supplementing oil way is connected with the low-pressure oil way; the second overflow valve is positioned between the low-pressure oil way and the oil return oil way; the third overflow valve is positioned between the oil supplementing oil way and the oil return oil way; the oil return way is connected with the main oil tank;
The energy storage system comprises a parallel energy storage device group, an energy storage oil way, a first throttle valve and a third stop valve; the parallel energy accumulator group is formed by connecting a plurality of independent energy accumulators in parallel; one end of the energy storage oil way is connected with an oil port of the parallel energy storage device group, and the other end of the energy storage oil way is connected with the high-pressure oil way and is positioned between the first check valve and the second check valve; the first throttle valve and the third stop valve are connected in parallel and are simultaneously positioned on the energy storage oil path;
the first stop valve is positioned between the oil supplementing oil way and the oil return oil way;
the wind wheel is connected with an input shaft of the hydraulic pump;
the generator is connected with the output shaft of the variable motor;
the main circulation system further comprises a pressure stabilizing energy accumulator which is positioned in the high-pressure oil path and is close to the oil inlet end of the first overflow valve;
the main circulation system further comprises a speed regulating valve, and the speed regulating valve is positioned at the oil inlet of the variable motor.
2. The hydrostatic energy storage type hydraulic drive type wind generating set according to claim 1, further comprising a high-altitude oil supplementing system and a pressure sensor, wherein the high-altitude oil supplementing system comprises a high-altitude oil supplementing tank, a second throttle valve and a fourth stop valve; the second throttle valve and the fourth stop valve are positioned between the high-level oil supplementing tank and an oil inlet of the hydraulic pump, and the fourth stop valve adopts an electromagnetic stop valve; the pressure sensor is positioned at the oil inlet end of the hydraulic pump and is used for detecting the pressure of the oil inlet of the hydraulic pump and assisting in controlling the on-off of the fourth stop valve.
3. The hydrostatic energy storage hydraulically actuated wind power generator set of claim 2, wherein the main circulation system further comprises a second check valve, a fourth relief valve, and a fifth shut-off valve; the second one-way valve is positioned at the oil inlet end of the hydraulic pump; the fifth stop valve is positioned on the high-pressure oil path and is close to the oil outlet end of the hydraulic pump; the fourth overflow valve is positioned between the high-pressure oil way and the low-pressure oil way, the oil inlet of the fourth overflow valve is positioned between the oil outlet of the hydraulic pump and the fifth stop valve, and the oil outlet is positioned between the oil inlet of the hydraulic pump and the second check valve.
4. The hydrostatic energy storage hydraulically actuated wind power generator unit of claim 3, wherein the main circulation system further comprises a first reversing valve, a fifth relief valve, a sixth relief valve, and a third check valve; the first reversing valve is positioned in the high-pressure oil way and is a two-position three-way reversing valve and is used for controlling connection between a first oil port and a second oil port or a third oil port, wherein the first oil port is connected with the oil outlet end of the hydraulic pump, the second oil port is connected with the oil inlet end of the variable motor, the third oil port is connected with the oil inlet end of the fifth overflow valve, the oil outlet of the fifth overflow valve is connected with the oil inlet end of the third one-way valve, and the oil outlet of the third one-way valve is connected with the low-pressure oil way and is positioned at the oil inlet end of the second one-way valve; and an oil inlet of the sixth overflow valve is positioned between the fifth overflow valve and the third one-way valve, and an oil outlet is connected with the oil return path.
5. The hydrostatic energy storage hydraulically actuated wind power generator unit of claim 1, wherein the main circulation system further comprises a second reversing valve and a fourth one-way valve; the second reversing valve is positioned in the low-pressure oil way and is a two-position three-way reversing valve and is used for controlling the connection between a first oil port and a second oil port or a third oil port, wherein the first oil port is connected with the oil outlet end of the variable motor, the second oil port is connected with the oil inlet end of the hydraulic pump, and the third oil port is connected with the high-pressure oil way and is positioned between the second stop valve and the oil inlet of the variable motor; and an oil inlet of the fourth one-way valve is connected with the main oil tank, and an oil outlet of the fourth one-way valve is connected with a third oil port of the second reversing valve.
6. A control method for a hydrostatic energy storage type hydraulic drive type wind generating set according to any one of claims 1 to 5 is characterized in that,
when there is a power generation demand and the wind speed is between the cut-in wind speed and the cut-out wind speed: the first stop valve and the third stop valve are in a disconnected state, and the second stop valve and the fifth stop valve are in a communicated state; the first oil port and the second oil port of the first reversing valve and the second reversing valve are communicated, and the third oil port is closed; the oil supplementing pump is in a working state; the oil supplementing pump sucks oil from the main oil tank and conveys the oil to an oil inlet of the hydraulic pump, the hydraulic pump outputs high-pressure oil under the drive of the wind wheel, the high-pressure oil flows to the variable motor through a high-pressure oil path, the variable motor is driven to rotate so as to drive the generator to rotate to generate electric energy, an oil outlet of the variable motor outputs low-pressure oil, one part of the low-pressure oil flows to an oil inlet of the hydraulic pump through a low-pressure oil path, and the other part of the low-pressure oil flows to the main oil tank through a second overflow valve; the oil supplementing pump sucks oil from the main oil tank and conveys the oil to the low-pressure oil path through the oil supplementing oil path;
When there is a need for power generation, but the wind speed is less than the cut-in wind speed or greater than the cut-out wind speed: the first stop valve and the second stop valve are in a communication state, and the third stop valve and the fourth stop valve are in a disconnection state; the first oil port and the second oil port of the second reversing valve are communicated, and the third oil port is closed; the oil supplementing pump is in a stop state; the high-pressure oil liquid in the parallel accumulator group enters the high-pressure oil way through the energy storage oil way and the first throttle valve, enters the variable motor after passing through the second stop valve and the speed regulating valve, drives the variable motor to rotate so as to drive the generator to rotate to generate electric energy, and the oil outlet of the variable motor outputs low-pressure oil liquid which flows to the main oil tank through the second reversing valve and the first stop valve;
when there is no power generation demand, but the wind speed is between the cut-in wind speed and the cut-out wind speed: the first stop valve and the second stop valve are in a disconnected state, and the third stop valve, the fourth stop valve and the fifth stop valve are in a communicated state; the first oil port of the first reversing valve is connected with the second oil port, the third oil port is closed, the first oil port of the second reversing valve is connected with the third oil port, and the second oil port is closed; the oil supplementing pump is in an operating state; the oil supplementing pump sucks oil from a main oil tank and conveys the oil to an oil inlet of the hydraulic pump, meanwhile, the oil in the high-level oil supplementing tank supplements the oil to the oil inlet of the hydraulic pump through a second throttle valve and a fourth stop valve, the hydraulic pump outputs high-pressure oil under the drive of a wind wheel, and the high-pressure oil sequentially flows into the parallel accumulator group through a fifth stop valve, a first reversing valve and a third stop valve to store the high-pressure oil; when the oil pressure in the high-pressure oil way exceeds the set pressure value of the first overflow valve, high-pressure oil flows to the main oil tank through the first overflow valve and the second overflow valve;
When the wind generating set is parked normally, the wind generating set is stopped normally: the first stop valve, the second stop valve, the third stop valve and the fourth stop valve are in a disconnected state, and the fifth stop valve is in a connected state; the first oil port and the third oil port of the first reversing valve and the second reversing valve are connected, and the second oil port is closed; the oil supplementing pump is in an operating state; the hydraulic pump outputs high-pressure oil under the drive of the wind wheel, the high-pressure oil flows to the hydraulic pump again after passing through a fifth stop valve, a first reversing valve, a fifth overflow valve, a third one-way valve and a second one-way valve to form a closed loop system, part of the high Wen Youye flowing through the fifth overflow valve flows to a main oil tank through a sixth overflow valve, and meanwhile, the oil supplementing pump supplements oil to the oil inlet end of the hydraulic pump; oil flowing out of an oil outlet of the variable motor flows into the variable motor again after passing through the second reversing valve and the speed regulating valve to form a closed loop system, and meanwhile, the oil is supplemented into the closed loop system from the main oil tank through the fourth one-way valve;
when the wind generating set needs emergency stop, the following steps are carried out: the first stop valve and the fourth stop valve are in a communication state, and the second stop valve, the third stop valve and the fifth stop valve are in a closed state; the first oil port of the first reversing valve is connected with the second oil port, the third oil port is closed, the first oil port of the second reversing valve is connected with the third oil port, and the second oil port is closed; the oil supplementing pump is in a stop state; the hydraulic pump outputs high-pressure oil under the drive of the wind wheel, the high-pressure oil flows through the fourth overflow valve and then flows to the hydraulic pump again to form a closed system, and meanwhile, the high-position oil supplementing box supplements the oil to the oil inlet end of the hydraulic pump through the second throttle valve and the fourth stop valve; oil flowing out of an oil outlet of the variable motor flows into the variable motor again after passing through the second reversing valve and the speed regulating valve to form a closed loop system, and meanwhile, the oil is supplemented into the closed loop system from the main oil tank through the fourth one-way valve.
7. The method of claim 6, wherein when there is a power generation demand and the wind speed is between the cut-in wind speed and the cut-out wind speed, and when there is no power generation demand but the wind speed is between the cut-in wind speed and the cut-out wind speed: the pressure sensor monitors the pressure of an oil inlet of the hydraulic pump in real time, and when the pressure of the oil inlet is detected to be lower than the lowest suction pressure of the hydraulic pump, the fourth stop valve enters a communication state, and oil in the high-level oil supplementing tank supplements oil to the oil inlet of the hydraulic pump; when the oil inlet pressure is higher than the lowest suction pressure of the hydraulic pump, the fourth stop valve is in a closed state.
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| CN108050013B (en) * | 2017-11-24 | 2020-08-07 | 兰州理工大学 | Control system for hydrostatic energy storage type hydraulic transmission type wind generating set |
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