CN106870289A - A kind of hydrostatic storage formula hydraulic drive type wind power generating set and control method - Google Patents
A kind of hydrostatic storage formula hydraulic drive type wind power generating set and control method Download PDFInfo
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- CN106870289A CN106870289A CN201710193270.2A CN201710193270A CN106870289A CN 106870289 A CN106870289 A CN 106870289A CN 201710193270 A CN201710193270 A CN 201710193270A CN 106870289 A CN106870289 A CN 106870289A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000002706 hydrostatic effect Effects 0.000 title claims abstract description 19
- 238000004146 energy storage Methods 0.000 claims abstract description 52
- 238000006073 displacement reaction Methods 0.000 claims abstract description 46
- 230000001502 supplementing effect Effects 0.000 claims description 66
- 238000010248 power generation Methods 0.000 claims description 20
- 230000001105 regulatory effect Effects 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 16
- 230000001276 controlling effect Effects 0.000 claims description 9
- 239000013589 supplement Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 230000005611 electricity Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000002828 fuel tank Substances 0.000 abstract 1
- 238000004891 communication Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 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
- 239000012530 fluid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000000819 phase cycle Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000010356 wave oscillation 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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- 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 wind-power electricity generation control technology field.In order to solve existing wind power generating set in actual moving process, device structure complicated problem when causing generated output unstable due to the unstable of wind speed and carrying out speed change using gear box structure, the invention discloses a kind of hydrostatic storage formula hydraulic drive type wind power generating set.The wind power generating set, including major circulatory system, ground oil-supplementing system, energy-storage system, main fuel tank, the first stop valve and wind wheel and generator, wherein major circulatory system include the hydraulic pump being connected with wind wheel, the variable displacement motor being connected with generator.Wind power generating set of the invention can be not only stabilized because of the power swing that wind speed change causes, and the pivot angle of variable displacement motor is adjusted by the rotating speed according to wind wheel, so as to the output speed of control variables motor, the rotating speed of stable generator is allowed to tend in the deviation range that power frequency rotating speed is reached required by grid-connected frequency, is more easy to realization and generates electricity by way of merging two or more grid systems.
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 transmission type wind generating set and a control method.
Background
In recent years, the world wind power industry has been developed sufficiently, and plays more and more important roles in relieving energy and environmental crisis. Currently, there are two main types of wind turbine generators in actual operation: a speed-increasing gear box-double-fed generator system and a direct-drive-converter system.
The speed-increasing gear box-double-fed generator system ensures constant frequency and constant voltage of output electric power by adjusting the amplitude, frequency and phase sequence of exciting current of the double-fed generator. Meanwhile, the vector conversion 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 capture tracking control of the maximum wind energy is realized. However, mechanical rattling occurs during a shifting operation by the speed increasing gear box to cause an increase in mechanical stress, eventually causing a failure of the gear box.
A direct-drive converter system generally adopts a low-speed permanent magnet synchronous generator. 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 less than the cut-in wind speed or more than the cut-out wind speed, high load and impact force are brought to a wind turbine, the problems of high harmonic wave of the grid-connected voltage, easy generation of harmonic wave oscillation of the power grid, high short-time overload cost and weak power grid voltage supporting capability exist.
Disclosure of Invention
The invention provides a hydrostatic energy storage type hydraulic transmission type wind generating set, aiming at solving the problems that the generated power is unstable due to unstable wind speed and the equipment structure is complex when a gear box structure is adopted for speed change in the actual operation process of the existing wind generating set. The wind generating set comprises a main circulating 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 circulating system comprises a hydraulic pump, a variable motor, a high-pressure oil way, a low-pressure oil way, a first overflow valve, a first one-way valve and a second stop valve; the high-pressure oil way is positioned between an oil outlet of the hydraulic pump and an oil inlet of the variable displacement motor; the low-pressure oil way is positioned between an oil outlet of the variable motor and an 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 replenishing pump is connected with the main oil tank; one end of the oil supplementing oil path is connected with an oil outlet of the oil supplementing pump, and the other end of the oil supplementing oil path is connected with the low-pressure oil path; 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 returning oil way; the oil return oil way is connected with the main oil tank;
the energy storage system comprises a parallel energy storage group, an energy storage oil way, a first throttling valve and a third stop valve; the parallel accumulator group is formed by connecting a plurality of independent accumulators in parallel; one end of the energy storage oil way is connected with an oil port of the parallel energy accumulator 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 stop valve; the first throttle valve and the third stop valve are connected in parallel and are positioned on the energy storage oil path at the same time;
the first stop valve is positioned between the oil supplementing oil way and the oil returning oil way;
the wind wheel is connected with an input shaft of the hydraulic pump;
the generator is connected with an output shaft of the variable displacement 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 throttling 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 is an electromagnetic stop valve; the pressure sensor is positioned at the oil inlet end of the hydraulic pump and 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 one-way valve, a fourth overflow valve and a fifth stop valve; the second check 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 an oil outlet end of the hydraulic pump; the fourth overflow valve is located between the high-pressure oil path and the low-pressure oil path, an oil inlet of the fourth overflow valve is located between an oil outlet of the hydraulic pump and the fifth stop valve, and an oil outlet of the fourth overflow valve is located between the oil inlet of the hydraulic pump and the second one-way valve.
Further preferably, the main circulation system further comprises a first reversing valve, a fifth overflow valve, a sixth overflow valve and a third one-way valve; the first reversing valve is positioned in the high-pressure oil way, 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 an oil outlet end of the hydraulic pump, the second oil port is connected with an oil inlet end of the variable motor, the third oil port is connected with an oil inlet of a fifth overflow valve, an oil outlet of the fifth overflow valve is connected with an oil inlet of a third one-way valve, and an oil outlet of the third one-way valve is connected with the low-pressure oil way and is positioned at an oil inlet end of the second one-way valve; an oil inlet of the sixth overflow valve is located between the fifth overflow valve and the third one-way valve, and an oil outlet of the sixth overflow valve is connected with the oil return way.
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, 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; 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 accumulator, and the pressure stabilizing accumulator is located in the high-pressure oil way 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 located at an oil inlet of the variable displacement motor.
A control method adopting any one of the hydrostatic energy storage type hydraulic transmission type wind generating sets,
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 driving of the wind wheel, the high-pressure oil flows to the variable displacement motor through the high-pressure oil way, the variable displacement motor is driven to rotate so as to drive the generator to rotate to generate electric energy, an oil outlet of the variable displacement motor outputs low-pressure oil, one part of the low-pressure oil flows to the oil inlet of the hydraulic pump through the low-pressure oil way, and the other part of the low-pressure oil flows to; the oil supplementing pump sucks oil from the main oil tank and conveys the oil to the low-pressure oil way through an oil supplementing oil way;
when the power generation is required, 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 communicated state, and the third stop valve and the fourth stop valve are in a disconnected state; a first oil port and a second oil port of the second reversing valve are communicated, and a third oil port is closed; the oil supplementing pump is in a stop state; high-pressure oil in the parallel accumulator group enters a high-pressure oil path through an energy storage oil path and a first throttle valve, enters a variable motor after passing through a second stop valve and a speed regulating valve, drives the variable motor to rotate so as to drive a generator to rotate to generate electric energy, an oil outlet of the variable motor outputs low-pressure oil, and the low-pressure oil flows to a main oil tank through a second reversing valve and a 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 the 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 oil to an oil inlet of the hydraulic pump through a second throttling valve and a fourth stop valve, the hydraulic pump outputs high-pressure oil under the driving of the wind wheel, and the high-pressure oil flows to the parallel accumulator group after sequentially passing through the fifth stop valve, the first reversing valve and the 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 normally stopped: 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 driving of the wind wheel, the high-pressure oil flows to the hydraulic pump again after passing through the fifth stop valve, the first reversing valve, the fifth overflow valve, the third check valve and the second check valve to form a closed-loop system, wherein part of high-temperature oil flowing through the fifth overflow valve flows to a main oil tank through the sixth overflow valve, and meanwhile, the oil supplementing pump supplements oil to the oil inlet end of the hydraulic pump; the oil liquid 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 liquid 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 first stop valve and the fourth stop valve are in a communicated 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 driving 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-level oil supplementing tank supplements the oil to the oil inlet end of the hydraulic pump through the second throttle valve and the fourth stop valve; and 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 power generation is required and the wind speed is between the cut-in wind speed and the cut-out wind speed and when no power generation is required and 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, 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 communicated state, and oil liquid in the high-level oil supplementing tank supplements oil to the oil inlet of the hydraulic pump; and when the pressure of the oil inlet 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 transmission wind generating set is adopted for wind power generation, and has the following beneficial effects:
1. according to the invention, a hydraulic transmission technology is introduced into the wind generating set, the wind wheel directly drives the hydraulic pump to output high-pressure oil, then the high-pressure oil drives the variable motor to output the rotating speed, and finally the generator is driven to rotate to generate power. Therefore, 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 rotating speed of the wind wheel, so that the output rotating speed of the variable motor is controlled, and the rotating speed of the generator is further stabilized. Meanwhile, the flow entering the variable motor is subjected to throttling control through the matching of the speed regulating valve, the rotating speed of the variable motor is accurately regulated to be close to the power frequency rotating speed, and the deviation range required by grid-connected frequency is achieved, so that a gear box and a converter in the existing wind generating set are omitted, and the weight of a cabin is reduced. 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 wind generating set can be conveniently installed and maintained.
2. The wind energy storage system is arranged, so that when wind energy is abundant, high-pressure oil output by the hydraulic pump driven by the wind wheel is stored and collected by the energy storage system, and when the 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, wind energy can be utilized more efficiently, and when no wind exists and power is needed, the wind generating set can continuously generate power in a short time to strive for time for dispatching of a power grid.
3. When the hydrostatic energy storage type hydraulic transmission type wind generating set is adopted for shutdown operation, firstly, the rotating speed of a wind wheel is greatly reduced by means of the operation of blade pitch variation or blade tip spoiler throwing-out; 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 circulating systems, and the rotating speeds of the hydraulic pump and the variable motor are gradually reduced to zero through the self-circulating systems of the hydraulic pump and the variable motor, so that the hydraulic braking effect is achieved; and finally, braking the transmission shaft between the wind wheel and the hydraulic pump by virtue of a brake disc to finish the parking operation. Because the wind generating set of the invention omits a gear box, if a brake disc is directly adopted to mechanically brake a wind wheel with low rotating speed and large torque, a large-size brake disc is needed to realize the braking operation, and harmful impact load can be generated in the process to damage equipment. Therefore, the wind generating set of the invention adopts the method of combining the hydraulic brake and the mechanical brake, which not only can reduce the braking force in the mechanical braking process, reduce the impact load, improve the working safety and the service life of the equipment, but also can reduce the size requirement on the brake disc, further reduce the weight of the engine room 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 transmission type wind generating set of the present invention;
FIG. 2 is a schematic diagram of a system for operating a wind turbine generator system according to the present invention 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 generator system according to 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 for operating a wind turbine generator system of the present invention when there is no power generation demand 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 for operating a wind turbine generator set according to the present invention when the wind turbine generator set is normally parked;
FIG. 6 is a schematic diagram of a system for operating a wind turbine generator set when the wind turbine generator set needs an emergency stop.
Detailed Description
The technical scheme of the invention is described in detail in the following with reference to the accompanying drawings.
Referring to fig. 1, the hydrostatic energy storage type hydraulic transmission wind turbine generator system includes a main circulation system 1, a ground oil supply 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 shutoff valve 107. The high-pressure oil path 103 is located between an oil outlet of the hydraulic pump 101 and an oil inlet of the variable motor 102, and the low-pressure oil path 104 is located between an oil outlet of the variable motor 102 and an oil inlet of the hydraulic pump 101. The first relief valve 105 is located between the high-pressure oil passage 103 and the low-pressure oil passage 104, the first check valve 106 and the second shutoff valve 107 are located on the high-pressure oil passage 103, and the second shutoff valve 107 is located closer to the variable displacement motor 102.
Preferably, a pressure flow sensor 81 is respectively disposed at an oil outlet end of the hydraulic pump 101 and an oil outlet end of the variable displacement motor 102, and is respectively used for detecting pressure and flow of oil in the high-pressure oil line 103 and the low-pressure oil line 104, and converting the pressure and flow into current signals to transmit to the control system, so as to realize remote monitoring of the main circulation system 1.
The ground oil supply system 2 includes an oil supply pump 201, an oil supply passage 202, a second relief valve 203, and a third relief valve 204. Wherein, the oil inlet and the main tank 4 of oil supplementing pump 201 are connected, and the oil-out is equipped with the filter for improve the cleanliness of input primary circulation system 1 interior fluid to and be equipped with the check valve, be used for preventing that the hydraulic shock in the primary circulation system 1 from causing the impact damage to oil supplementing pump 201. One end of the oil supplementing oil path 202 is connected with an oil outlet of the oil supplementing pump 201, and the other end is connected with the low-pressure oil path 104. The second relief valve 203 is located between the low-pressure oil passage 104 and the return oil passage 401. Third spill valve 204 is located between oil replenishment passage 202 and oil return passage 401. The oil return passage 401 is connected to the main tank 4. Preferably, the oil replenishing 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 replenishing pump 201 can be properly increased to improve the oil flow rate of the input low-pressure oil path 104, thereby avoiding the occurrence of the suction phenomenon of the hydraulic pump 101.
The energy storage system 3 comprises a parallel energy storage group 301, an energy storage oil path 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 position of each accumulator, so that the single accumulator can be conveniently dismounted and overhauled without influencing the normal work 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 group 301, and the other end is connected with the high-pressure oil path 103 and is located between the first check valve 106 and the second stop valve 107, so that the oil output by the parallel energy storage group 301 enters the high-pressure oil path 103 and only flows to the variable displacement motor 102 through the second stop valve 107. The first throttle valve 303 and the third cut-off valve 304 are connected in parallel and are located on the charge oil path 302 at the same time.
When high-pressure oil is stored in the parallel accumulator set 301, namely the high-pressure oil enters the energy storage system 3 from the high-pressure oil line 103, the third stop valve 304 is in a communicated state, so that the high-pressure oil can quickly enter the energy accumulator through the third stop valve 304, and the high-pressure oil is stored quickly and with low loss. When the high-pressure oil in the parallel accumulator set 301 is released, that is, the high-pressure oil enters the high-pressure oil passage 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 passage 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 the 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 arranged at the oil port position of the parallel accumulator set 301 and the oil port end of the first throttle valve 303 close to the high-pressure oil path 103, and are respectively used for acquiring and detecting the oil pressure and flow entering the parallel accumulator set 301 and the oil pressure and flow entering the high-pressure oil path 103 through the first throttle valve 303, and the oil pressure and flow are used as reference values for adjusting the swing angle of the variable motor 102. In addition, a relief valve 305 is provided at the port location of the parallel accumulator set 301 to limit the maximum pressure of the stored oil within the parallel accumulator set 301.
The first stop valve 5 is located between the oil supply path 202 and the oil return path 401, and when the first stop valve 5 is in a communication state, the oil supply path 202 and the low pressure path 104 are directly communicated with the main oil tank 4, so that the oil in the oil supply path 202 and part of the low pressure path 104 can be quickly drained.
The wind wheel 6 is connected with the input shaft of the hydraulic pump 101, the generator 7 is connected with the output shaft of the 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 the cabin above the tower through an oil pipeline. This allows to reduce both the size and the weight of the nacelle and to eliminate the operations of hoisting the variable displacement motor 102 and the generator 7. In addition, a speed sensor 82 is provided at an end surface position of the wind rotor 6 for detecting the rotational speed of the wind rotor 6. A rotational speed sensor 83 for detecting the rotational speed of the drive shaft is provided at the input shaft of the hydraulic pump 101 and the output shaft of the variable displacement motor 102. In this way, the operation conditions of the wind wheel 6 and the generator 7 can be remotely monitored in real time and problems can be found in time. Further, in the present invention, the generator 7 is an excited synchronous generator.
Preferably, the wind generating set further comprises a high altitude oil supplementing system 9 and a pressure sensor 84. The high-altitude oil supplementing system 9 comprises a high-altitude oil supplementing tank 901, a second throttling valve 902 and a fourth stop valve 903. The second throttle valve 902 and the fourth stop valve 903 are connected in series and located between the high-level oil supplementing tank 901 and an oil inlet of the hydraulic pump 101, and the fourth stop valve 903 is an electromagnetic stop valve. The pressure sensor 84 is located at an oil inlet end of the hydraulic pump 101, and is used for detecting the pressure of the oil inlet of the hydraulic pump 101. In this way, when the pressure sensor 84 detects that the pressure at the oil inlet of the hydraulic pump 101 is lower than the minimum oil inlet pressure of the hydraulic pump 101, a control signal is sent out to switch the fourth stop valve 903 to the connected state, and the oil in the high-level oil supplementing tank 901 flows into the low-pressure oil path 104 through the second throttle 902 and the fourth stop valve 903 under the action of the atmospheric pressure, so as to supplement the oil at the oil inlet of the hydraulic pump 101 in time. 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 the rapidity of supplementing oil to the hydraulic pump 101 can be improved, the on-way 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 includes a second check valve 108, a fourth spill valve 109, and a fifth stop valve 110. Wherein the second check valve 108 is located at the oil inlet end of the hydraulic pump 101. The fifth cut-off valve 110 is located on the high-pressure oil path 103 and near the oil outlet end of the hydraulic pump 101. The fourth spill valve 109 is located between the high-pressure oil passage 103 and the low-pressure oil passage 104, and the oil inlet of the fourth spill valve 109 is located between the oil outlet of the hydraulic pump 101 and the fifth cut-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 direction changing valve 111, a fifth relief valve 112, a sixth relief valve 113 and a third check valve 114. The first directional valve 111 is located in the high-pressure oil path 103, and adopts a two-position three-way directional 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. A first oil port of the first reversing valve 111 is connected with an oil outlet end of the hydraulic pump 101, a second oil port is connected with an oil inlet end of the variable displacement motor 102, and a third oil port is connected with an oil inlet of the fifth overflow valve 112. An oil outlet of the fifth overflow valve 112 is connected with an oil inlet of a third check valve 114. The oil outlet of the third check valve 114 is connected to the low-pressure oil passage 104 and is located at the oil inlet end of the second check valve 108. An oil inlet of the sixth relief valve 113 is located between the fifth relief 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 includes a second direction changing valve 115 and a fourth check valve 116. The second directional valve 115 is located in the low pressure oil path 104 and adopts a two-position three-way directional 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. A first oil port of the second directional valve 115 is connected to an oil outlet end of the variable motor 102, a second oil port is connected to an oil inlet end of the hydraulic pump 101, and a third oil port is connected to the high-pressure oil path 103 and is located between the second stop valve 107 and an oil inlet of the variable motor 102. An oil inlet of the fourth check valve 116 is connected with the main oil tank 4, and an oil outlet of the fourth check valve is connected with a 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 passage 103 and near the oil inlet end of the first relief valve 105. Thus, when the output oil of the hydraulic pump 101 has flow pulsation and hydraulic impact due to the unstable rotation speed of the wind wheel 6, the flow pulsation and the hydraulic impact can be absorbed and stabilized rapidly in time through the pressure stabilizing energy accumulator 117, so that the oil flowing to the variable displacement motor 102 is kept stable, the output rotation speed of the variable displacement motor 102 is stabilized, and the power fluctuation of the generator 7 is reduced.
Preferably, the primary 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 replenishing oil passage 202. The oil pump is used for preventing the supplementary oil output by the oil pump 201 from directly flowing to the hydraulic motor 102 after entering the low-pressure oil path 104, so that the influence on the normal operation of the hydraulic motor 102 is prevented.
Preferably, the primary circulation system 1 further includes a speed regulating valve 119 and is located at an oil inlet of the variable displacement motor 102. The flow entering the variable displacement motor 102 is controlled by the speed regulating valve 119, and the actual output rotation speed of the variable displacement motor 102 is controlled by adjusting the swing angle of the variable displacement 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 adjusted to control the actual flow entering the variable motor 102, so that the final output rotating speed of the variable motor 102 is controlled, the rotating speed of the generator 7 is controlled and tends to the power frequency rotating speed, the generator 7 can be directly connected to the 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 all adopt an electromagnetic stop valve structure, and the first relief valve 105, the fourth relief valve 109, and the fifth relief valve 112 all adopt a proportional relief valve structure. Therefore, remote control over the hydraulic elements can be realized through remote current control signals, so that the wind generating set can be controlled quickly and accurately and controlled automatically. Aiming at a 600KW wind generating set, the highest set pressure of a first overflow valve 105 in the wind generating set is 30MPa, and the first overflow valve is used for limiting the highest pressure of oil in a high-pressure oil way 103 and protecting the operation safety of a main circulation system 1. The second overflow valve 203 and the sixth overflow valve 113 are respectively set to be 1.5MPa and used for guiding high-temperature oil in the system to the main oil tank 4 and reducing the temperature of the oil in the system. The third relief valve 204 is set to 2MPa, and is used for limiting the oil pressure output by the oil replenishing pump 201. The maximum pressure set by the fourth relief valve 109 and the fifth relief valve 112 is 30MPa, respectively, and the pressure set value is gradually increased by adjustment when used as a load, thereby adjusting the pressure load of the corresponding oil passage.
The control method of the hydrostatic energy storage type hydraulic transmission type wind generating set comprises the following steps:
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 wind speed condition meets the normal operation of the wind generating set, and the ground oil supplementing system 2 assists the main circulating system 1 to work.
Referring to fig. 1 and 2, the first stop valve 5 and the third stop valve 304 are in a cut-off state, the second stop valve 107 and the fifth stop valve 110 are in a communication state, the first oil port and the second oil port of the first direction valve 111 and the second direction valve 115 are in communication, the third oil port is closed, and the oil replenishment pump 201 is in a 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 displacement motor 102 through the high-pressure oil path 103, and during the period, the high-pressure oil 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 to drive the variable displacement motor 102 to rotate, so as to drive the generator 7 to rotate to generate electric energy. The oil outlet of the variable displacement motor 102 outputs low-pressure oil, after the low-pressure oil passes through the second reversing valve 115, a 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 flows to the main oil tank 4. The oil supply pump 201 sucks oil from the main tank 4 and supplies the oil to the low-pressure oil passage 104 through the oil supply passage 202. In this way, a part of the high-temperature oil flows back to the main tank 4 through the second relief valve 203, and the low-temperature oil is supplied to the low-pressure oil passage 104 again through the oil supply pump 201, thereby controlling the oil temperature of the main circulation system 1.
Preferably, in the process, the pressure sensor 84 monitors the pressure of the oil inlet of the hydraulic pump 101 in real time, when the pressure of the oil inlet is lower than the lowest oil inlet pressure of the hydraulic pump 101, the fourth stop valve 903 enters a communication state, and oil in the high-level oil supply tank 901 is used for supplying oil to the oil inlet of the hydraulic pump 101 in time; when the oil inlet pressure is higher than the minimum oil inlet pressure of the hydraulic pump 101, the fourth cut-off valve 903 is in a closed state. This can avoid the problem of the pump 101 being empty due to the failure to supply enough oil when the oil replenishing 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 stops rotating when entering a shutdown state, and the energy storage system 3 is used as a power unit to maintain the normal power generation of the generator 7.
Referring to fig. 1 and 3, the first stop valve 5 and the second stop valve 107 are in a connected state, the third stop valve 304 and the fourth stop valve 903 are in a disconnected state, the first oil port and the second oil port of the second direction valve 115 are connected, the third oil port is closed, and the oil replenishment pump 201 is in a stopped state. At this time, the high-pressure oil passage 103 is blocked by the first check valve 106, and the low-pressure oil passage 104 is directly connected to the main tank 4 by the first blocking valve 5. Thus, an open hydraulic system is formed by the energy storage system 3 as a power unit, the variable displacement motor 102 as an execution unit and the main oil tank 4 as an oil return tank. High-pressure oil stored in the parallel accumulator set 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, enters the variable displacement motor 102, drives the variable displacement 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 operation of the wind wheel 6, and the hydraulic pump 101 can be driven 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 in conjunction, the first and second cut valves 5 and 107 are in the cut-off state, and the third and fifth cut valves 304 and 110 are in the communication 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 replenishing pump 201 is in a working state. At this time, the high-pressure oil passage 103 is blocked by the second blocking valve 107, and the low-pressure oil passage 104 is blocked by the second selector valve 115, so that the variable displacement motor 102 is isolated. The oil supplementing pump 201 sucks oil from the main oil tank 4, and conveys the oil to the oil inlet end of the hydraulic pump 101 through the oil supplementing oil path 202 and the second check valve 108, the hydraulic pump 101 outputs high-pressure oil under the driving of the wind wheel 6, and the high-pressure oil flows to the parallel accumulator 301 to be stored after passing through the fifth stop valve 110, the first reversing valve 111, the first check valve 106 and the third stop valve 304 in sequence. When the oil pressure in the high-pressure oil path 103 exceeds the set pressure value of the first relief valve 105, the high-pressure oil flows to the main oil 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 therefore is always in the closed state. In addition, if the wind speed suddenly drops and the drop amplitude is large in the process, in order to avoid the hydraulic impact in the high-pressure oil path from affecting the hydraulic pump 101 and the wind wheel 6, the pressure value of the first relief valve 105 needs to be properly reduced, and then the oil in the high-pressure oil path 103 needs to be properly depressurized. After the wind speed recovers 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 replenishing 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 replenishing operation is performed on the hydraulic pump 101 by means of the high-level oil replenishing tank 901, so that the phenomenon that the oil inlet of the hydraulic pump 101 is vacuumed is avoided, and the normal work of the hydraulic pump 101 is ensured.
When the wind generating set is normally stopped, firstly, the rotating speed of the wind wheel 6 is greatly reduced by means of the operation of blade pitch variation or blade tip spoiler throwing-out, then the hydraulic pump 101 and the variable motor 102 are subjected to speed reduction operation to reduce the rotating speeds of the wind wheel 6 and the generator 7 to zero, and finally, mechanical stopping is carried out by means of braking equipment. In this case, it is required to avoid hydraulic shock and suction during the deceleration operation of the hydraulic pump 101 and the variable displacement motor 102.
Referring to 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 a disconnected state, the fifth stop valve 110 is in a connected state, the first oil port and the third oil port of the first direction valve 111 and the second direction valve 115 are connected, the second oil port is closed, and the oil replenishment pump 201 is in an operating state. Thus, the main circulation system 1 is divided into two parts by the first direction changing valve 111, the second stop valve 107, the fifth check valve 118 and the second direction changing valve 115, one part is a large circulation system of the hydraulic pump 101, and oil is supplemented by the oil supplementing pump 201; the other part is a self-circulation system of the variable displacement motor 102, and self-priming oil is supplied from the main oil tank 4. The hydraulic pump 101 outputs high-pressure oil under the driving 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 check valve 114 and the second check valve 108, so that a closed-loop system is formed. Part of the high-temperature oil flowing through the fifth relief valve 112 flows to the main oil tank 4 through the sixth relief valve 113, and the oil replenishing pump 201 replenishes the oil to the oil inlet end of the hydraulic pump 101. In this way, the pressure load in the large circulation system of the hydraulic pump 101 is gradually increased by adjusting the set pressure value of the fifth relief valve 112 in real time from the zero pressure, thereby realizing the deceleration operation of the hydraulic pump 101. The oil liquid flowing out of the oil outlet of the variable motor 102 passes through the second reversing valve 115 and the speed regulating valve 119 and then flows into the variable motor 102 again to form a closed loop system, and meanwhile, the oil liquid is supplemented into the closed loop system from the main oil tank 4 through the fourth check valve 116, so that the phenomenon of air suction during the deceleration and parking processes of the variable motor 102 is avoided. In addition, in order to prevent the high-pressure oil in the high-pressure oil path 103 from flowing to the oil outlet end of the variable displacement motor 102 through the second directional control valve 115 to affect the variable displacement motor 102, a check valve may be disposed between the third oil port of the second directional control valve 115 and the high-pressure oil path 103, so as to prevent the high-pressure oil from flowing to the oil outlet end of the variable displacement motor 102 through the second directional control valve 115.
When the wind generating set needs to be stopped urgently, for example, when the hydraulic system fails and the hydraulic pump is short of oil absorption, the hydraulic pump 101 is required to be stopped quickly, and hydraulic impact and suction phenomena are required to be avoided.
Referring to fig. 1 and 6, the fourth cut-off valve 903 is in a communication state, the second cut-off valve 107, the third cut-off valve 304, and the fifth cut-off valve 110 are in a closed state, the first oil port and the third oil port of the second direction valve 115 are connected, the second oil port is closed, and the oil replenishment pump 201 is in a stop state. Thus, the main circulation system 1 is cut 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, one part is a small circulation system of the hydraulic pump 101, and oil is supplemented by the high-level oil supplementing system 9; the other part is a self-circulation system of the variable displacement motor 102, and self-priming oil is supplied from the main oil tank 4. The hydraulic pump 101 outputs high-pressure oil under the driving 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 pressure load in the small circulation system of the hydraulic pump 101 is gradually increased by adjusting the set pressure value of the fourth relief valve 109 in real time from zero pressure, thereby realizing the deceleration stop operation of the hydraulic pump 101. Meanwhile, under the action of atmospheric pressure, oil in the high-level oil supply tank 901 is supplied to the oil inlet end of the hydraulic pump 101 through the second throttle valve 902 and the fourth stop valve 903. Thus, the hydraulic pump 101 is quickly stopped by shortening the length of the oil path of the circulation system and quickly supplying oil from the high-level oil supply system 9. The variable displacement motor 102 is the same as the normal shutdown process and will not be described again. In addition, the first cut-off valve 5 is in a communication state, so that the oil in the oil supply passage 202 and part of the low-pressure passage 104 can be quickly drained to the main oil tank 4 through the first cut-off valve 5.
Claims (9)
1. A hydrostatic energy storage type hydraulic transmission type wind generating set is characterized by comprising a main circulating 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 circulating system comprises a hydraulic pump, a variable motor, a high-pressure oil way, a low-pressure oil way, a first overflow valve, a first one-way valve and a second stop valve; the high-pressure oil way is positioned between an oil outlet of the hydraulic pump and an oil inlet of the variable displacement motor; the low-pressure oil way is positioned between an oil outlet of the variable motor and an 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 replenishing pump is connected with the main oil tank; one end of the oil supplementing oil path is connected with an oil outlet of the oil supplementing pump, and the other end of the oil supplementing oil path is connected with the low-pressure oil path; 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 returning oil way; the oil return oil way is connected with the main oil tank;
the energy storage system comprises a parallel energy storage group, an energy storage oil way, a first throttling valve and a third stop valve; the parallel accumulator group is formed by connecting a plurality of independent accumulators in parallel; one end of the energy storage oil way is connected with an oil port of the parallel energy accumulator 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 stop valve; the first throttle valve and the third stop valve are connected in parallel and are positioned on the energy storage oil path at the same time;
the first stop valve is positioned between the oil supplementing oil way and the oil returning oil way;
the wind wheel is connected with an input shaft of the hydraulic pump;
the generator is connected with an output shaft of the variable displacement motor.
2. The hydrostatic energy storage type hydraulic transmission wind generating set according to claim 1, further comprising an overhead oil supply system and a pressure sensor, wherein the overhead oil supply system comprises an overhead oil supply 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 is an electromagnetic stop valve; the pressure sensor is positioned at the oil inlet end of the hydraulic pump and 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 type hydraulically driven wind generating set of claim 2, wherein the primary circulation system further comprises a second check valve, a fourth spill valve, and a fifth stop valve; the second check 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 an oil outlet end of the hydraulic pump; the fourth overflow valve is located between the high-pressure oil path and the low-pressure oil path, an oil inlet of the fourth overflow valve is located between an oil outlet of the hydraulic pump and the fifth stop valve, and an oil outlet of the fourth overflow valve is located between the oil inlet of the hydraulic pump and the second one-way valve.
4. The hydrostatic energy storage type hydraulic transmission wind generating set according to claim 1, wherein the main circulation system further includes 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, 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 an oil outlet end of the hydraulic pump, the second oil port is connected with an oil inlet end of the variable motor, the third oil port is connected with an oil inlet of a fifth overflow valve, an oil outlet of the fifth overflow valve is connected with an oil inlet of a third one-way valve, and an oil outlet of the third one-way valve is connected with the low-pressure oil way and is positioned at an oil inlet end of the second one-way valve; an oil inlet of the sixth overflow valve is located between the fifth overflow valve and the third one-way valve, and an oil outlet of the sixth overflow valve is connected with the oil return way.
5. The hydrostatic energy storage hydraulically driven wind generating set 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, 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; 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. The hydrostatic energy storage type hydraulic transmission wind generating set according to claim 1, wherein the main circulation system further includes a pressure-stabilizing accumulator, the pressure-stabilizing accumulator being located in the high-pressure oil path and near an oil inlet end of the first overflow valve.
7. The hydrostatic energy storage type hydraulically driven wind generating set of claim 1, wherein the primary circulation system further comprises a speed regulating valve, the speed regulating valve being located at an oil inlet of the variable displacement motor.
8. A control method using the hydrostatic energy storage type hydraulic transmission type wind generating set according to any one of claims 1 to 7,
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 driving of the wind wheel, the high-pressure oil flows to the variable displacement motor through the high-pressure oil way, the variable displacement motor is driven to rotate so as to drive the generator to rotate to generate electric energy, an oil outlet of the variable displacement motor outputs low-pressure oil, one part of the low-pressure oil flows to the oil inlet of the hydraulic pump through the low-pressure oil way, and the other part of the low-pressure oil flows to; the oil supplementing pump sucks oil from the main oil tank and conveys the oil to the low-pressure oil way through an oil supplementing oil way;
when the power generation is required, 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 communicated state, and the third stop valve and the fourth stop valve are in a disconnected state; a first oil port and a second oil port of the second reversing valve are communicated, and a third oil port is closed; the oil supplementing pump is in a stop state; high-pressure oil in the parallel accumulator group enters a high-pressure oil path through an energy storage oil path and a first throttle valve, enters a variable motor after passing through a second stop valve and a speed regulating valve, drives the variable motor to rotate so as to drive a generator to rotate to generate electric energy, an oil outlet of the variable motor outputs low-pressure oil, and the low-pressure oil flows to a main oil tank through a second reversing valve and a 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 the 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 oil to an oil inlet of the hydraulic pump through a second throttling valve and a fourth stop valve, the hydraulic pump outputs high-pressure oil under the driving of the wind wheel, and the high-pressure oil flows to the parallel accumulator group after sequentially passing through the fifth stop valve, the first reversing valve and the 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 normally stopped: 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 driving of the wind wheel, the high-pressure oil flows to the hydraulic pump again after passing through the fifth stop valve, the first reversing valve, the fifth overflow valve, the third check valve and the second check valve to form a closed-loop system, wherein part of high-temperature oil flowing through the fifth overflow valve flows to a main oil tank through the sixth overflow valve, and meanwhile, the oil supplementing pump supplements oil to the oil inlet end of the hydraulic pump; the oil liquid 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 liquid 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 first stop valve and the fourth stop valve are in a communicated 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 driving 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-level oil supplementing tank supplements the oil to the oil inlet end of the hydraulic pump through the second throttle valve and the fourth stop valve; and 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.
9. The method of claim 8, wherein 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, and 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: the pressure sensor monitors the pressure of an 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 communicated state, and oil in the high-level oil supplementing tank supplements oil to the oil inlet of the hydraulic pump; and when the pressure of the oil inlet is higher than the lowest suction pressure of the hydraulic pump, the fourth stop valve is in a closed state.
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| CN107781111A (en) * | 2017-09-15 | 2018-03-09 | 燕山大学 | Energy storage type hydraulic wind power generating set primary frequency control system and control method |
| CN108019392A (en) * | 2018-01-27 | 2018-05-11 | 宁波市博尔法液压有限公司 | A kind of hydraulic lock |
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| CN108131248A (en) * | 2018-02-01 | 2018-06-08 | 兰州理工大学 | A kind of low wind speed activation system of hydraulic pressure wind power generator group |
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| CN108050013A (en) * | 2017-11-24 | 2018-05-18 | 兰州理工大学 | For the control system of hydrostatic storage formula hydraulic drive type wind power generating set |
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| CN108868904A (en) * | 2018-06-14 | 2018-11-23 | 重庆科技学院 | It is a kind of for recycling the hydraulic variable motor speed-regulating system of natural gas remaining energy |
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| CN110805521A (en) * | 2019-11-08 | 2020-02-18 | 燕山大学 | Novel frequency modulation control system and control method for energy storage type hydraulic wind generating set |
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