CN115419542A - Pumped storage unit - Google Patents
Pumped storage unit Download PDFInfo
- Publication number
- CN115419542A CN115419542A CN202211044739.3A CN202211044739A CN115419542A CN 115419542 A CN115419542 A CN 115419542A CN 202211044739 A CN202211044739 A CN 202211044739A CN 115419542 A CN115419542 A CN 115419542A
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- Prior art keywords
- water
- pumped
- channel
- power generation
- turbine
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 86
- 238000010248 power generation Methods 0.000 claims abstract description 32
- 238000004146 energy storage Methods 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 abstract description 11
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 9
- 230000006872 improvement Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000002441 reversible effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 241001672018 Cercomela melanura Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
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
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/06—Stations or aggregates of water-storage type, e.g. comprising a turbine and a pump
-
- 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
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/004—Valve arrangements
-
- 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
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B15/00—Controlling
-
- 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
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/10—Machines or engines of reaction type; Parts or details peculiar thereto characterised by having means for functioning alternatively as pumps or turbines
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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
- F05B2270/00—Control
- F05B2270/50—Control logic embodiment by
- F05B2270/506—Control logic embodiment by hydraulic means, e.g. hydraulic valves within a hydraulic circuit
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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
- Y02E10/20—Hydro energy
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
- Hydraulic Turbines (AREA)
- Control Of Water Turbines (AREA)
Abstract
The invention discloses a pumped storage unit which comprises a unit, a water discharge power generation channel and a pumped storage channel. Under the working conditions of water pumping and power generation, the flow directions of working media in the shared section and the water pump turbine are unchanged, and the steering of the water turbine is unchanged. Therefore, a frequency conversion starting device SFC or a water turbine for starting is not needed, a large-current reversing switch and current-carrying equipment are not needed outside the motor, the investment and the operating cost are reduced, and the operation amount is reduced. When the working condition is switched, the operation of inflation drainage and water injection pressure building is not needed, and the machine set has no problems of vibration, blade cavitation, pipeline water hammer and the like; the failure rate of the equipment can be effectively reduced, the safety of the equipment is improved, and the service life of the equipment is prolonged. In addition, the invention can also keep high-efficiency streamline and reduce hydraulic loss; the wear rate of the surface of the blade is reduced, and the service life of the blade is prolonged.
Description
Technical Field
The invention relates to the field of pumped storage units, in particular to a pumped storage unit.
Background
The pumped storage is an advanced and clean energy storage technology, namely, water is used as an energy storage medium, and the storage and management of electric energy are realized through the mutual conversion of electric energy and potential energy. The pumped storage has the functions of peak regulation, frequency modulation, phase modulation, energy storage, system standby, black start and the like, has the technical advantages of large capacity, multiple working conditions, high speed, high reliability, good economy and the like, plays a fundamental role in ensuring the safety of a power grid, promoting the consumption of new energy and improving the performance of the whole system, and is an important component of an energy internet. The method has the advantages that the development of pumped storage is accelerated, the method is an urgent requirement for constructing a novel power system, the method is an important support for ensuring the safe and stable operation of the power system, and the method is an important guarantee for the large-scale development of renewable energy sources.
The pumped storage is mainly realized by a pumped storage unit. In the prior art, when a pumped storage unit is switched between pumping and generating working conditions, the steering of a turbine and a generator needs to be changed, and a motor needs to be disconnected in the switching process; the starting of the working condition of the pump requires the auxiliary dragging of an external frame starting frequency converter SFC or a water turbine; moreover, when the working conditions of water pumping and power generation are switched, the processes of air inflation, water drainage, water injection, air exhaust and the like are required, the operation flow is complex, the number of accessory equipment and fault links is large, and the continuous support and friendliness to a power grid are poor.
Specifically, the prior art uses reversible pump turbines for pumped storage operations. When the reversible pump turbine is used for changing power generation into water pumping, an additional set of starting frequency converter SFC or a starting water turbine is required to be installed to achieve synchronous rotating speed. The larger the capacity of the unit, the larger the moment of inertia, and the multiplied increase in SFC cost. In addition, the commutation needs a large-current switch and current-carrying equipment, the electrical primary and secondary design is complex, and the investment is high.
During the process of the working condition conversion of the reversible pump turbine, air inflation and water injection operations are required. A set of compressed air system is added for inflation, the turbine can vibrate when water injection and exhaust are carried out to build pressure, water hammer can be generated on the turbine and a pipeline when exhaust is insufficient, and the static water flow easily generates cavitation effect, unit vibration, pipeline water hammer and the like on a full-speed impeller. In addition, the volute design of the reversible pump turbine cannot give consideration to the efficiency of the power generation and the efficiency of the water pump in two water flow directions, so that the hydraulic loss of the volute in the operation mode is caused.
Disclosure of Invention
The invention aims to overcome the problems and provide a pumped storage unit. The technical problems of the existing pumped storage unit are solved, stable transition and seamless connection of working condition conversion are realized, the operation reliability of the unit is improved, and the overall energy conversion efficiency is improved. In order to achieve the purpose, the invention adopts the following technical scheme:
a pumped storage unit comprises a unit body, a water discharge power generation channel and a pumped storage channel, wherein a pump turbine is arranged on the lower portion of the unit body, a shared section is arranged at the pump turbine of the water discharge power generation channel and the pumped storage channel, a spherical three-way valve is arranged at the intersection of the water discharge power generation channel and the pumped storage channel, the spherical three-way valve switches and controls the working states of the water discharge power generation channel and the pumped storage channel, the water flow direction of the shared section is unchanged, and the unit body pumps water and generates electricity to keep the same rotation direction.
As an improvement, the water discharge power generation channel comprises a first water discharge power generation channel and a second water discharge power generation channel, and when the pumped storage unit generates power, water sequentially passes through the first water discharge power generation channel, the pump turbine, the sharing section and the second water discharge power generation channel and is discharged into a downstream water storage tank.
As an improvement, the pumped-storage channel comprises a first pumped-storage channel and a second pumped-storage channel, and when the pumped-storage unit pumps water, water is discharged into the upstream reservoir through the first pumped-storage channel, the pump turbine, the common section and the second pumped-storage channel in sequence.
As an improvement, the pump-turbine is a diagonal flow pump-turbine, a multistage pump-turbine or a rotary-paddle pump-turbine, and blades in the diagonal flow pump-turbine are turbine blades working on two sides.
As an improvement, in the switching process of the spherical three-way valve, the upper three-way valve and the lower three-way valve are sequentially and gradually switched (switching program: the upper three-way valve is half-opened, the lower three-way valve is fully opened/closed, and then the upper three-way valve is fully closed/opened), and the guide vane control of the water pump turbine is matched, so that the passing flow of the water pump turbine under the maximum cut-off condition can be ensured to be not lower than the minimum allowed flow; and under the maximum short-circuit flow, the overpressure and the over-flow of the draft tube of the pump turbine are prevented.
As an improvement, a main shaft of the pump turbine is provided with a bidirectional thrust bearing and a guide bearing.
The invention has the advantages that:
1. under the working conditions of water pumping and power generation, the flow directions of working media in the shared section and the water pump turbine are unchanged, and the steering of the water turbine is unchanged. Therefore, a frequency conversion starting device SFC or a water turbine for starting is not needed, a large-current reversing switch and current-carrying equipment are not needed outside the motor, the investment and the operating cost are reduced, and the operation amount is reduced.
2. When the working conditions of water pumping and power generation are switched, the system is in stable transition, and the motor does not need to be off-grid or be subjected to quasi-synchronous grid-connection operation.
3. When the working condition is switched, the operation of inflation drainage and water injection pressure building is not needed, and the machine set has no problems of vibration, blade cavitation, pipeline water hammer and the like; the failure rate of the equipment can be effectively reduced, the safety of the equipment is improved, and the service life of the equipment is prolonged.
4. When the invention is in the working conditions of pumping water and generating electricity, the flow direction of the working medium in the water pump and turbine is unchanged, the inlet and outlet of the turbine can keep a high-efficiency streamline, the streamline design in the volute is optimal, the hydraulic loss is minimum, and the energy conversion efficiency is improved.
5. The invention can work on both sides of the blades of the water turbine under two working conditions of water pumping and power generation, can slow down the surface abrasion rate of the blades and prolong the service life of the blades.
Drawings
FIG. 1 is a schematic diagram of the operation of a pumped storage group in embodiment 1 when discharging water to generate electricity;
fig. 2 is a schematic diagram illustrating the operation of the pumped-storage group in embodiment 1 during pumped-storage.
The figures are labeled as follows:
1-unit, 2-water discharging and power generating channel, 21-first water discharging and power generating channel, 22-second water discharging and power generating channel, 3-pumped storage channel, 31-first pumped storage channel, 32-second pumped storage channel, 4-water pump turbine, 5-shared section, 6-spherical three-way valve and 7-downstream reservoir.
Detailed Description
The present invention will be described in detail and specifically by the following examples so as to better understand the present invention, but the following examples do not limit the scope of the present invention.
Example 1
The embodiment discloses a pumped storage unit, which comprises a unit 1, a water discharge power generation channel 2 and a pumped storage channel 3. The lower part of the unit is provided with a pump turbine 4. The water discharge power generation channel 2 and the water pumping energy storage channel 3 are provided with a shared section 5 at the pump water turbine 4, a spherical three-way valve 6 is arranged at the intersection of the water discharge power generation channel 2 and the water pumping energy storage channel 3, the spherical three-way valve 6 switches and controls the working states of the water discharge power generation channel 2 and the water pumping energy storage channel 3, the water flow direction of the shared section 5 is unchanged, and the pump water turbine 4 pumps water and generates electricity to keep the same rotation direction.
The discharge power generation passage 2 includes a first discharge power generation passage 21 and a second discharge power generation passage 22. When the pumped storage group generates electricity, water sequentially passes through the first water discharge and electricity generation channel 21, the pump turbine 4, the shared section 5 and the second water discharge and electricity generation channel 22 and is discharged into the downstream reservoir 7.
The pumped-hydro energy storage passage 3 includes a first pumped-hydro energy storage passage 31 and a second pumped-hydro energy storage passage 32. When the pumped storage unit pumps water, water is discharged into an upstream reservoir through the first pumped storage channel 31, the pump turbine 4, the shared section 5 and the second pumped storage channel 32 in sequence.
The pump turbine 4 is selected from one of a diagonal flow pump turbine, a multi-stage pump turbine or a rotary blade pump turbine. Wherein, the optimal scheme is a diagonal flow pump turbine. Blades inside the diagonal flow type pump turbine adopt turbine blades working on two sides.
The spherical three-way valve 6 is gradually switched according to the fixed program sequence in the switching process, so that the passing flow of the water turbine of the water pump at the maximum cut-off is not lower than the minimum allowed flow; under the maximum short-circuit flow, the overpressure and the overflow of the draft tube of the pump turbine are ensured not to occur.
The main shaft of the pump turbine is provided with a bidirectional thrust bearing and a guide bearing, so that the upward thrust of the working condition of the pump can offset part of the dead weight of the turbine, the friction loss is reduced, and the efficiency is improved.
The embodiments of the present invention have been described in detail above, but they are merely exemplary, and the present invention is not equivalent to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, it is intended that all equivalent alterations and modifications be included within the scope of the invention, without departing from the spirit and scope of the invention.
Claims (6)
1. The pumped storage unit is characterized by comprising a unit, a water discharge power generation channel and a pumped storage channel, wherein a water pump turbine is arranged at the lower part of the unit, a shared section is arranged below the water pump turbine of the water discharge power generation channel and the pumped storage channel, a spherical three-way valve is arranged at the intersection of the water pump turbine and the water pump turbine, the spherical three-way valve switches and controls the working states of the pumped storage channel and the water discharge power generation channel, the water flow direction of the shared section is unchanged, and the unit pumps water and generates electricity to keep the same rotation direction.
2. The pumped-storage group according to claim 1, wherein the discharging power generation channel comprises a first discharging power generation channel and a second discharging power generation channel, and when the pumped-storage group generates power, water is discharged into the downstream reservoir through the first discharging power generation channel, the pump turbine, the common section and the second discharging power generation channel in sequence.
3. The pumped-hydro energy storage unit of claim 1, wherein the pumped-hydro energy storage channel comprises a first pumped-hydro energy storage channel and a second pumped-hydro energy storage channel, and wherein when the pumped-hydro energy storage unit pumps water, the water is discharged into the upstream reservoir through the first pumped-hydro energy storage channel, the pump turbine, the common section, and the second pumped-hydro energy storage channel in sequence.
4. The pumped-hydro energy storage unit as claimed in claim 1, wherein the pump turbine is a diagonal flow pump turbine, a multi-stage pump turbine or a Kaplan pump turbine, and blades inside the diagonal flow pump turbine are turbine blades working on both sides.
5. The pumped-storage aggregate according to claim 1, wherein the spherical three-way valve is switched gradually in sequence between the upstream and downstream three-way valves during switching, so as to ensure that the water turbine passing flow rate of the water pump at the maximum cut-off is not lower than the minimum allowable flow rate; under the maximum short-circuit flow, the overpressure and the overflow of the draft tube of the pump turbine are ensured not to occur.
6. The pumped-hydro energy storage unit as claimed in claim 1, wherein the pump turbine has a main shaft provided with a bidirectional thrust bearing and a guide bearing.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211044739.3A CN115419542A (en) | 2022-08-23 | 2022-08-23 | Pumped storage unit |
| DE202022106691.4U DE202022106691U1 (en) | 2022-08-23 | 2022-11-29 | A pumped storage unit |
| ZA2022/12996A ZA202212996B (en) | 2022-08-23 | 2022-11-30 | Pumped storage unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211044739.3A CN115419542A (en) | 2022-08-23 | 2022-08-23 | Pumped storage unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115419542A true CN115419542A (en) | 2022-12-02 |
Family
ID=84200621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211044739.3A Pending CN115419542A (en) | 2022-08-23 | 2022-08-23 | Pumped storage unit |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN115419542A (en) |
| DE (1) | DE202022106691U1 (en) |
| ZA (1) | ZA202212996B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117231408B (en) * | 2023-11-16 | 2024-01-26 | 安徽丰洲建设科技有限公司 | Water conservancy turbine unit power generation facility |
| CN117937535B (en) * | 2023-12-20 | 2024-08-23 | 西安理工大学 | Current transformer capacity selection method of doubly-fed variable-speed pumped storage unit |
| CN118188286B (en) * | 2024-05-17 | 2024-07-19 | 南方电网调峰调频发电有限公司检修试验分公司 | Operation adjusting method and device of pumped storage unit and storage medium |
-
2022
- 2022-08-23 CN CN202211044739.3A patent/CN115419542A/en active Pending
- 2022-11-29 DE DE202022106691.4U patent/DE202022106691U1/en active Active
- 2022-11-30 ZA ZA2022/12996A patent/ZA202212996B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE202022106691U1 (en) | 2023-01-24 |
| ZA202212996B (en) | 2023-02-22 |
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Application publication date: 20221202 |