CN113217191A - Variable-speed constant-frequency compressed air energy storage and peak shaving system and method - Google Patents
Variable-speed constant-frequency compressed air energy storage and peak shaving system and method Download PDFInfo
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- CN113217191A CN113217191A CN202110574420.0A CN202110574420A CN113217191A CN 113217191 A CN113217191 A CN 113217191A CN 202110574420 A CN202110574420 A CN 202110574420A CN 113217191 A CN113217191 A CN 113217191A
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- compressed air
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- clutch
- synchronous generator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
- F02C6/14—Gas-turbine plants having means for storing energy, e.g. for meeting peak loads
- F02C6/16—Gas-turbine plants having means for storing energy, e.g. for meeting peak loads for storing compressed air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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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
- 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
Abstract
The invention discloses a variable-speed constant-frequency compressed air energy storage and peak shaving system and a method, wherein the system comprises an incoming line transformer, a frequency converter, a variable-frequency synchronous generator, a compressor, a first clutch, a turbine, a second clutch, a compressed air storage tank, a combustion chamber and a PLC (programmable logic controller); an external power grid is connected with a variable frequency synchronous generator through an incoming line transformer and a frequency converter, a compressor is connected with the variable frequency synchronous generator through a first clutch, and a turbine is connected with the variable frequency synchronous generator through a second clutch; the outlet of the compressor is communicated with a compressed air storage tank, the compressed air storage tank is communicated with the inlet of the combustion chamber, and the outlet of the combustion chamber is communicated with the inlet of the turbine; the PLC is connected with the first clutch and the second clutch, and the system and the method are high in electricity changing efficiency and high in unit power generation starting speed.
Description
Technical Field
The invention belongs to the technical field of compressed air energy storage, and relates to a variable-speed constant-frequency compressed air energy storage and peak shaving system and method.
Background
With the increasing of the power generation scale of new energy, the problems of power generation intermittency and fluctuation and even counterregulation become more and more prominent, and an effective technical scheme is urgently needed to solve the large-scale grid connection problem of the new energy. The large-scale power Energy Storage technology is an effective way to solve the problem, and a Compressed Air Energy Storage system (CAES) is considered to be one of the large-scale power Energy Storage technologies with the greatest development prospect, and has the advantages of large Energy Storage scale, long Storage period, small environmental pollution and the like.
The traditional compressed air energy storage mode is that when storing energy, the motor drives the compressor to compress air and store the compressed air in the air storage device, and in the power generation process, high-pressure air is released from the air storage device to drive the expander to drive the generator to output electric energy by applying an energy technology. The motor and the generator are different systems, the electricity conversion efficiency is relatively low, the compressed air is required to do work during power generation, then power generation can be carried out, the starting speed of the generator set is low, and certain limitation is realized during peak regulation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a variable-speed constant-frequency compressed air energy storage and peak regulation system and method.
In order to achieve the aim, the variable-speed constant-frequency compressed air energy storage peak shaving system comprises an incoming line transformer, a frequency converter, a variable-frequency synchronous generator, a compressor, a first clutch, a turbine, a second clutch, a compressed air storage tank, a combustion chamber and a PLC (programmable logic controller);
an external power grid is connected with a variable frequency synchronous generator through an incoming line transformer and a frequency converter, a compressor is connected with the variable frequency synchronous generator through a first clutch, and a turbine is connected with the variable frequency synchronous generator through a second clutch;
the outlet of the compressor is communicated with a compressed air storage tank, the compressed air storage tank is communicated with the inlet of the combustion chamber, and the outlet of the combustion chamber is communicated with the inlet of the turbine;
the PLC controller is connected with the first clutch and the second clutch.
An air pressure gauge is arranged in the compressed air storage tank, and the PLC is connected with the air pressure gauge.
An air inlet valve is arranged at the air inlet of the compressed air storage tank, and the PLC is connected with the air inlet valve.
An air outlet valve is arranged at the air outlet of the compressed air storage tank, and the PLC is connected with the air outlet valve.
The outlet of the compressor is communicated with a compressed air storage tank through a cooling chamber.
The compressed air storage tank is communicated with the inlet of the combustion chamber through the heat absorption side of the waste heat exchanger, the outlet of the combustion chamber is communicated with the inlet of the turbine, and the outlet of the turbine is communicated with the heat release side of the waste heat exchanger.
The external power grid is connected with the variable-frequency synchronous generator through the outgoing line switch cabinet, the incoming line transformer, the frequency converter and the incoming line switch cabinet, and the PLC is connected with the outgoing line switch cabinet and the incoming line switch cabinet.
The compressor and the turbine are coaxial with the variable frequency synchronous generator.
A variable-speed constant-frequency compressed air energy storage peak regulation method comprises the following steps:
when the external power grid is in a wave trough for storing energy, the PLC controller controls the second clutch to be separated, the first clutch is closed, the electric drive variable frequency synchronous generator output by the external power grid works, and the variable frequency synchronous generator drives the compressor to compress air and stores the compressed air in the compressed air storage tank;
when the power grid is at a peak for generating power and adjusting the peak, the PLC controller controls the first clutch to be separated, the second clutch to be closed, compressed air in the compressed air storage tank enters the combustion chamber for supporting combustion, high-temperature flue gas generated in the combustion chamber enters the turbine for acting, the turbine drives the variable-frequency synchronous generator to generate power, and electric energy generated by the variable-frequency synchronous generator is supplemented to the external power grid.
The invention has the following beneficial effects:
the variable-speed constant-frequency compressed air energy storage and peak regulation system and the method have the advantages that during specific operation, the energy storage working condition and the power generation working condition are integrally designed, namely, the variable-frequency synchronous generator drives the compressor to compress air for energy storage, the turbine is started to work through smoke generated by combustion supporting of the compressed air so as to drive the variable-frequency synchronous generator to generate power, and meanwhile, the first clutch and the second clutch are controlled to realize flexible conversion of the working condition during working, so that the power conversion efficiency is high, the power generation starting speed of the unit is high, and the unit is quickly started to generate power to participate in peak regulation.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
The system comprises a power supply, a controller, a power supply, a controller and a controller, wherein 1 is an outgoing line switch cabinet, 2 is an incoming line transformer, 3 is an incoming line switch cabinet, 4 is a frequency converter, 5 is a variable frequency synchronous generator, 6 is a PLC controller, 7 is a compressor, 8 is a turbine, 91 is a first clutch, 92 is a second clutch, 10 is a cooling chamber, 11 is a combustion chamber, 12 is a waste heat exchanger, and 13 is a compressed air storage tank.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the variable speed constant frequency compressed air energy storage peak shaving system of the present invention includes an outgoing line switch cabinet 1, an incoming line transformer 2, an incoming line switch cabinet 3, a frequency converter 4, a variable frequency synchronous generator 5, a PLC controller 6, a compressor 7, a turbine 8, a first clutch 91, a second clutch 92, a cooling chamber 10, a combustion chamber 11, a waste heat exchanger 12, and a compressed air storage tank 13;
an external power grid is connected with the variable-frequency synchronous generator 5 through the outgoing line switch cabinet 1, the incoming line transformer 2, the frequency converter 4 and the incoming line switch cabinet 3, the compressor 7, the turbine 8 and the variable-frequency synchronous generator 5 are coaxial, a first clutch 91 is arranged between the compressor 7 and the variable-frequency synchronous generator 5, and a second clutch 92 is arranged between the turbine 8 and the variable-frequency synchronous generator 5.
The outlet of the compressor 7 is communicated with a compressed air storage tank 13 through a cooling chamber 10, the compressed air storage tank 13 is communicated with the inlet of a combustion chamber 11 through the heat absorption side of a waste heat exchanger 12, the outlet of the combustion chamber 11 is communicated with the inlet of a turbine 8, and the outlet of the turbine 8 is communicated with the heat release side of the waste heat exchanger 12.
A barometer is arranged in the compressed air storage tank 13, an air inlet valve is arranged at an air inlet of the compressed air storage tank 13, an air outlet of the compressed air storage tank 13 is provided with an air outlet valve, and the PLC 6 is connected with the barometer, the first clutch 91, the second clutch 92, the outgoing line switch cabinet 1, the incoming line switch cabinet 3, the air inlet valve and the air outlet valve.
The variable-speed constant-frequency compressed air energy storage peak regulation method comprises the following steps of:
when the power grid is in a wave trough for energy storage, the PLC 6 controls the incoming switch cabinet 3 and the outgoing switch cabinet 1 to be switched on, and simultaneously controls the second clutch 92 to be separated, the first clutch 91 is closed, when the variable-frequency synchronous generator 5 is started, the turbine 8 does not work, the variable-frequency synchronous generator 5 drives the compressor 7 to compress air, and stores the compressed air in the compressed air storage tank 13, when the air pressure in the compressed air storage tank 13 reaches the highest pressure, the first clutch 91 is separated, and simultaneously the air inlet valve at the air inlet of the compressed air storage tank 13 is closed, so that the energy storage stage is completed, wherein the variable-frequency synchronous generator 5 is controlled by the frequency converter 4 to operate in a motor state to drive the compressor 7, the starting working condition of the unit is realized, and the rotating speed of a shafting reaches a target rotating speed value according to the set rotating speed and the accelerating speed.
When the power grid is in a wave crest for generating and peak-shaving, the PLC 6 controls the incoming switch cabinet 3 and the outgoing switch cabinet 1 to be closed, the first clutch 91 is separated, the second clutch 92 is closed, the frequency converter 4 drives the frequency conversion synchronous generator 5 to start working for the working condition of the motor, and the rotating speed of the shafting reaches a target rotating speed value according to the set rotating speed and the speed increasing rate.
An air outlet valve at the air outlet of a compressed air storage tank 13 is opened, compressed air in the compressed air storage tank 13 enters a combustion chamber 11 for combustion supporting after being subjected to heat absorption by a heat absorption side of a waste heat exchanger 12, high-temperature flue gas generated in the combustion chamber 11 enters a turbine 8 for acting, the turbine 8 drives a variable frequency synchronous generator 5 to generate electricity, and electric energy generated by the variable frequency synchronous generator 5 is supplemented to an electric network, wherein the output of the variable frequency synchronous generator 5 is gradually reduced along with the start of the output of the turbine 8 until the output of the variable frequency synchronous generator 5 is zero, at the moment, the driving of the turbine 8 is completed, the variable frequency synchronous generator 5 enters a power generation state along with the further improvement of the output of the turbine 8, and the generated electric energy is transmitted to the electric network so as to supplement the electric network.
When the pressure of the compressed air storage tank 13 is lower than the lowest pressure, the second clutch 92 is disconnected, the air outlet valve on the compressed air storage tank 13 is closed, and the power generation peak regulation stage is completed.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A variable-speed constant-frequency compressed air energy storage and peak shaving system is characterized by comprising an incoming line transformer (2), a frequency converter (4), a variable-frequency synchronous generator (5), a compressor (7), a first clutch (91), a turbine (8), a second clutch (92), a compressed air storage tank (13), a combustion chamber (11) and a PLC (programmable logic controller) (6);
an external power grid is connected with a variable-frequency synchronous generator (5) through an incoming line transformer (2) and a frequency converter (4), a compressor (7) is connected with the variable-frequency synchronous generator (5) through a first clutch (91), and a turbine (8) is connected with the variable-frequency synchronous generator (5) through a second clutch (92);
the outlet of the compressor (7) is communicated with a compressed air storage tank (13), the compressed air storage tank (13) is communicated with the inlet of the combustion chamber (11), and the outlet of the combustion chamber (11) is communicated with the inlet of the turbine (8);
the PLC controller (6) is connected to the first clutch (91) and the second clutch (92).
2. The variable speed constant frequency compressed air energy storage and peak shaving system according to claim 1, wherein a barometer is arranged in the compressed air storage tank (13), and the PLC controller (6) is connected with the barometer.
3. The variable speed constant frequency compressed air energy storage and peak shaving system according to claim 1, wherein an air inlet valve is arranged at an air inlet of the compressed air storage tank (13), and the PLC (6) is connected with the air inlet valve.
4. The variable speed constant frequency compressed air energy storage and peak shaving system according to claim 1, wherein an air outlet valve is arranged at an air outlet of the compressed air storage tank (13), and the PLC (6) is connected with the air outlet valve.
5. The system according to claim 1, wherein the outlet of the compressor (7) is connected to the compressed air reservoir (13) via a cooling chamber (10).
6. The variable speed constant frequency compressed air energy storage and peak shaving system according to claim 1, wherein the compressed air storage tank (13) is communicated with the inlet of the combustion chamber (11) through the heat absorption side of the waste heat exchanger (12), the outlet of the combustion chamber (11) is communicated with the inlet of the turbine (8), and the outlet of the turbine (8) is communicated with the heat release side of the waste heat exchanger (12).
7. The variable-speed constant-frequency compressed air energy storage peak shaving system according to claim 1, wherein an external power grid is connected with the variable-frequency synchronous generator (5) through the outgoing line switch cabinet (1), the incoming line transformer (2), the frequency converter (4) and the incoming line switch cabinet (3), and the PLC controller (6) is connected with the outgoing line switch cabinet (1) and the incoming line switch cabinet (3).
8. The variable speed constant frequency compressed air energy storage peak shaving system according to claim 1, wherein the compressor (7), the turbine (8) and the variable frequency synchronous generator (5) are coaxial.
9. A variable speed constant frequency compressed air energy storage peak shaving method, based on the variable speed constant frequency compressed air energy storage peak shaving system of claim 1, comprising the steps of:
when an external power grid is in a wave trough for storing energy, a PLC (6) controls a second clutch (92) to be separated, a first clutch (91) is closed, an electric-driven variable-frequency synchronous generator (5) output by the external power grid works, the variable-frequency synchronous generator (5) drives a compressor (7) to compress air, and the compressed air is stored in a compressed air storage tank (13);
when the power grid is at a peak for power generation and peak shaving, the PLC (6) controls the first clutch (91) to be separated, the second clutch (92) is closed, compressed air in the compressed air storage tank (13) enters the combustion chamber (11) for combustion supporting, high-temperature flue gas generated in the combustion chamber (11) enters the turbine (8) for acting, the turbine (8) drives the frequency conversion synchronous generator (5) to generate power, and electric energy generated by the frequency conversion synchronous generator (5) is supplemented to the external power grid.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110574420.0A CN113217191A (en) | 2021-05-25 | 2021-05-25 | Variable-speed constant-frequency compressed air energy storage and peak shaving system and method |
| PCT/CN2021/115568 WO2022247037A1 (en) | 2021-05-25 | 2021-08-31 | Variable-speed constant-frequency compressed air energy storage peak shaving system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110574420.0A CN113217191A (en) | 2021-05-25 | 2021-05-25 | Variable-speed constant-frequency compressed air energy storage and peak shaving system and method |
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| CN113217191A true CN113217191A (en) | 2021-08-06 |
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| CN202110574420.0A Pending CN113217191A (en) | 2021-05-25 | 2021-05-25 | Variable-speed constant-frequency compressed air energy storage and peak shaving system and method |
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| CN (1) | CN113217191A (en) |
| WO (1) | WO2022247037A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113606119A (en) * | 2021-08-27 | 2021-11-05 | 西安热工研究院有限公司 | Variable-speed constant-frequency compressed air energy storage power generation system |
| WO2022247037A1 (en) * | 2021-05-25 | 2022-12-01 | 西安热工研究院有限公司 | Variable-speed constant-frequency compressed air energy storage peak shaving system and method |
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| WO2022247037A1 (en) * | 2021-05-25 | 2022-12-01 | 西安热工研究院有限公司 | Variable-speed constant-frequency compressed air energy storage peak shaving system and method |
| CN113606119A (en) * | 2021-08-27 | 2021-11-05 | 西安热工研究院有限公司 | Variable-speed constant-frequency compressed air energy storage power generation system |
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| WO2022247037A1 (en) | 2022-12-01 |
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