CN112737129A - Electrochemistry and flywheel hybrid energy storage system - Google Patents
Electrochemistry and flywheel hybrid energy storage system Download PDFInfo
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- CN112737129A CN112737129A CN202110011378.1A CN202110011378A CN112737129A CN 112737129 A CN112737129 A CN 112737129A CN 202110011378 A CN202110011378 A CN 202110011378A CN 112737129 A CN112737129 A CN 112737129A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
- H02J15/007—Systems for storing electric energy involving storage in the form of mechanical energy, e.g. fly-wheels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/50—Energy storage in industry with an added climate change mitigation effect
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Abstract
An electrochemical and flywheel hybrid energy storage system comprises an electrochemical energy storage device, a battery management system, a flywheel energy storage device, a flywheel control system, an energy storage energy management system, an energy storage auxiliary frequency modulation control device group, a bidirectional converter group and a transformer group. The device for combining the electrochemistry and the flywheel hybrid energy storage system of the power plant unit comprises the power plant unit and the electrochemistry and flywheel hybrid energy storage system. The invention combines the electrochemistry and the flywheel hybrid energy storage system through the power plant unit, preferentially controls the electrochemistry energy storage device and the flywheel energy storage device to perform corresponding actions when the power grid needs to raise/lower load frequency modulation, has the advantages of high regulation speed, short response time and high regulation precision, and when a high-power auxiliary machine is started or not stopped, the instantaneous voltage fluctuates, the electrochemistry energy storage device and the flywheel energy storage device can rapidly supplement or absorb the part of energy, thereby maintaining the stable bus voltage and ensuring the safe operation of a high-power plant transformer.
Description
Technical Field
The invention relates to the field of energy sources, in particular to an electrochemical and flywheel hybrid energy storage system.
Background
The energy storage technology is a technology for storing energy through mechanical, electromagnetic and electrochemical methods and the like, converting the energy into electric energy through the mechanical, electromagnetic and electrochemical methods when needed, and providing electric energy for electric equipment, and is a technology for bringing breakthrough progress to development and operation of an energy system. The problems of low response speed and insufficient regulation precision usually occur when the currently used energy storage technology is used for carrying out frequency regulation on a power plant unit, and when a high-power auxiliary machine is started or stopped, the instantaneous voltage fluctuates, so that the safety accident of high-power plant change is easy to occur.
In order to solve the above problems, the present application provides an electrochemical and flywheel hybrid energy storage system.
Disclosure of Invention
Objects of the invention
The invention provides an electrochemical and flywheel hybrid energy storage system, which is combined by a power plant unit, and the electrochemical and flywheel hybrid energy storage system is preferentially controlled to perform corresponding actions when a power grid needs to raise/lower load frequency modulation.
(II) technical scheme
In order to solve the problems, the invention provides an electrochemical and flywheel hybrid energy storage system, which comprises an electrochemical energy storage device, a battery management system, a flywheel energy storage device, a flywheel control system, an energy storage energy management system, an energy storage auxiliary frequency modulation control device group, a bidirectional converter group and a transformer group, wherein the electrochemical energy storage device is connected with the battery management system through a power supply; the energy storage energy management system is in communication connection with the electrochemical energy storage device, the battery management system, the flywheel energy storage device, the flywheel control system, the energy storage auxiliary frequency modulation control device group, the bidirectional converter group and the transformer group; the energy storage auxiliary frequency modulation control device set comprises an energy storage auxiliary frequency modulation control device I and an energy storage auxiliary frequency modulation control device II; the bidirectional converter group comprises a bidirectional converter I and a bidirectional converter II; the transformer group comprises a first transformer and a second transformer; the battery management system is connected with the electrochemical energy storage devices in a one-to-one correspondence manner to form an electrochemical energy storage unit; the bidirectional converter is respectively connected with the first transformer and the battery management system; the flywheel control system and the flywheel energy storage devices are connected in a one-to-one correspondence manner to form a flywheel energy storage unit; the bidirectional converter II is respectively connected with the transformer II and the flywheel control system; the first transformer and the second transformer are simultaneously connected with a working bus; the energy storage auxiliary frequency modulation control device is connected with the bidirectional converter I, the battery management system and the power plant unit; and the energy storage auxiliary frequency modulation control device II is connected with the bidirectional converter II, the flywheel control system and the power plant unit.
Preferably, the electrochemical energy storage units are arranged in a plurality of groups.
Preferably, the first energy storage auxiliary frequency modulation control device and the first bidirectional converter are arranged in one-to-one correspondence with the electrochemical energy storage units.
Preferably, the flywheel energy storage units are provided in multiple groups.
Preferably, the energy storage auxiliary frequency modulation control device II and the bidirectional converter II are arranged in one-to-one correspondence with the flywheel energy storage units.
Preferably, the first energy storage auxiliary frequency modulation control device and the second energy storage auxiliary frequency modulation control device are both provided with a primary frequency modulation control unit and an AGC frequency modulation control unit.
The invention also provides a device for combining the electrochemistry and the flywheel hybrid energy storage system of the power plant unit, which comprises the power plant unit and the electrochemistry and flywheel hybrid energy storage system; the power plant unit is provided with a control unit; the control unit is connected with an energy storage auxiliary frequency modulation control device set in the electrochemical and flywheel hybrid energy storage system.
Preferably, the device comprises the following working steps:
s1, issuing a power grid dispatching frequency modulation instruction to a power plant unit, and simultaneously acquiring the frequency modulation instruction by the electrochemical and flywheel hybrid energy storage system;
s2, when the frequency modulation instruction is a load ascending/descending instruction, the electrochemistry and flywheel hybrid energy storage system correspondingly carries out discharging/charging, wherein the flywheel energy storage device carries out discharging/charging with short time and low power, and the electrochemistry energy storage device carries out discharging/charging with long time and high power;
s3, judging whether the flywheel energy storage device and the electrochemical energy storage device can meet the instruction requirement, if so, not requiring synchronous response of the generating set of the power plant;
s4, if the flywheel energy storage device and the electrochemical energy storage device cannot meet the demand of the command, the electrochemical and flywheel hybrid energy storage system firstly makes up the power difference between the output of the power plant unit and the frequency modulation command in a short time by utilizing the characteristic of high response speed of the electrochemical and flywheel hybrid energy storage system;
and S5, after the response of the power plant unit is followed, the output of the electrochemical and flywheel hybrid energy storage system is gradually reduced so as to ensure that the combined output of the electrochemical and flywheel hybrid energy storage system and the power plant unit is consistent with a power grid dispatching frequency modulation instruction.
Preferably, when a flywheel energy storage device and an electrochemical energy storage device in the electrochemical and flywheel hybrid energy storage system work, the optimal capacity ratio of discharging/charging and a corresponding optimal control strategy need to be selected according to the specific power utilization field.
The technical scheme of the invention has the following beneficial technical effects:
the electrochemical and flywheel hybrid energy storage system provided by the invention is provided with the cooperation of the electrochemical energy storage device and the flywheel energy storage device, converts redundant electric energy into chemical energy and kinetic energy for storage when the redundant electric energy exists, and converts the kinetic energy and the chemical energy into electric energy when the electric energy is insufficient, so that the bidirectional regulation is realized, the reliability is high, the service life is long, meanwhile, the response speed of energy conversion is high, the time is short, the regulation precision is high, the frequency modulation capability of a power grid can be effectively increased, and the stable operation of the power grid is maintained;
the device of the combined electrochemistry and flywheel hybrid energy storage system of the power plant unit, provided by the invention, preferentially controls the electrochemistry energy storage device and the flywheel energy storage device to perform corresponding actions when the power grid needs to raise/lower load frequency modulation, has the advantages of high regulation speed, short response time and high regulation precision, can effectively solve the problems of large equipment abrasion caused by frequent start and stop of auxiliary equipment and a main steam regulating valve and actions when the power plant unit responds to a frequency modulation instruction, prolongs the service life of main and auxiliary equipment, reduces the failure rate, reduces the control difficulty and ammonia spraying usage amount of the unit desulfurization and denitration, and reduces nitrogen oxides discharged by the unit; frequent and violent changes of boiler operation parameters are reduced, air distribution is gentle, boiler tube abrasion is reduced, and the safe operation time of the boiler is prolonged; the impact on the power grid when the renewable energy is merged into the power grid is reduced; when the high-power auxiliary engine is started or not stopped, the instantaneous voltage fluctuates, the electrochemical energy storage device and the flywheel energy storage device can rapidly supplement or absorb the part of energy, the bus voltage is maintained to be stable, and the safe operation of a high-power plant is ensured.
Drawings
Fig. 1 is a schematic structural diagram of an electrochemical and flywheel hybrid energy storage system according to the present invention.
Fig. 2 is a schematic diagram of the operation condition under the load ascending/descending instruction in the electrochemical and flywheel hybrid energy storage system according to the present invention.
Fig. 3 is a block diagram of an apparatus structure of a combined electrochemical and flywheel hybrid energy storage system of a power plant unit according to the present invention.
Fig. 4 is a working schematic diagram of an apparatus of a combined electrochemical and flywheel hybrid energy storage system of a power plant unit according to the present invention.
The attached drawings are marked as follows: 101. a first bidirectional converter; 102. an electrochemical energy storage device; 103. a battery management system; 104. a first transformer; 201. a bidirectional converter II; 202. a flywheel energy storage device; 203. a flywheel control system; 204. a second transformer; 301. the energy storage auxiliary frequency modulation control device I; 302. a second energy storage auxiliary frequency modulation control device; a1, electrochemical energy storage; a2, flywheel energy storage; b1, electrochemical compensation; b2, flywheel compensation; c. and (5) power grid dispatching instructions.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. 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 invention.
Example 1
As shown in fig. 1, the electrochemical and flywheel hybrid energy storage system provided by the present invention includes an electrochemical energy storage device 102, a battery management system 103, a flywheel energy storage device 202, a flywheel control system 203, an energy storage energy management system, an energy storage auxiliary frequency modulation control device set, a bidirectional converter set, and a transformer set; the energy storage energy management system is in communication connection with the electrochemical energy storage device 102, the battery management system 103, the flywheel energy storage device 202, the flywheel control system 203, the energy storage auxiliary frequency modulation control device group, the bidirectional converter group and the transformer group; the energy storage auxiliary frequency modulation control device set comprises an energy storage auxiliary frequency modulation control device I301 and an energy storage auxiliary frequency modulation control device II 302; the bidirectional converter group comprises a first bidirectional converter 101 and a second bidirectional converter 201; the transformer group comprises a first transformer 104 and a second transformer 204; the battery management system 103 is connected with the electrochemical energy storage devices 102 in a one-to-one correspondence manner to form an electrochemical energy storage unit; the bidirectional converter I101 is respectively connected with the transformer I104 and the battery management system 103; the flywheel control systems 203 are correspondingly connected with the flywheel energy storage devices 202 one by one to form a flywheel energy storage unit; the bidirectional converter II 201 is respectively connected with the transformer II 204 and the flywheel control system 203; the first transformer 104 and the second transformer 204 are simultaneously connected with a working bus; the first energy storage auxiliary frequency modulation control device 301 is connected with the first bidirectional converter 101, the battery management system 103 and the power plant unit; and the second energy storage auxiliary frequency modulation control device 302 is connected with the second bidirectional converter 201, the flywheel control system 203 and the power plant unit.
In an alternative embodiment, the electrochemical energy storage cells are arranged in a plurality of groups.
In an alternative embodiment, the energy storage auxiliary frequency modulation control device I301 and the bidirectional converter I101 are arranged in one-to-one correspondence with the electrochemical energy storage units.
In an alternative embodiment, the flywheel energy storage units are provided in a plurality of groups.
In an alternative embodiment, the second energy storage auxiliary frequency modulation control device 302 and the second bidirectional converter 201 are arranged in one-to-one correspondence with the flywheel energy storage units.
In an alternative embodiment, the first energy storage auxiliary frequency modulation control device 301 and the second energy storage auxiliary frequency modulation control device 302 are both provided with a primary frequency modulation control unit and an AGC frequency modulation control unit.
As shown in fig. 2, the electrochemical energy storage device 102 and the flywheel energy storage device 202 are arranged to cooperate with each other, so that when surplus electric energy exists, the surplus electric energy is converted into chemical energy and kinetic energy to be stored, and when the surplus electric energy is insufficient, the kinetic energy and the chemical energy are converted into electric energy, so that bidirectional regulation is realized, the reliability is high, the operation life is long, meanwhile, the response speed of energy conversion is high, the time is short, the regulation precision is high, the frequency modulation capability of a power grid can be effectively increased, and the stable operation of the power grid is.
Example 2
3-4, the present invention further provides an apparatus for combining an electrochemical and flywheel hybrid energy storage system with a power plant unit, which comprises the power plant unit and the above electrochemical and flywheel hybrid energy storage system; the power plant unit is provided with a control unit; the control unit is connected with an energy storage auxiliary frequency modulation control device set in the electrochemical and flywheel hybrid energy storage system.
In an alternative embodiment, the apparatus operates as follows:
s1, issuing a power grid dispatching frequency modulation instruction to a power plant unit, and simultaneously acquiring the frequency modulation instruction by the electrochemical and flywheel hybrid energy storage system;
s2, when the frequency modulation instruction is a load ascending/descending instruction, the electrochemistry and flywheel hybrid energy storage system correspondingly carries out discharging/charging, wherein the flywheel energy storage device 202 carries out discharging/charging with short time and low power, and the electrochemistry energy storage device 102 carries out discharging/charging with long time and high power;
s3, judging whether the flywheel energy storage device 202 and the electrochemical energy storage device 102 can meet the instruction requirement, if so, not requiring synchronous response of the generating set of the power plant;
s4, if the flywheel energy storage device 202 and the electrochemical energy storage device 102 cannot meet the demand requirement, the electrochemical and flywheel hybrid energy storage system firstly makes up the power difference between the power generation unit output and the frequency modulation demand in a short time by utilizing the characteristic of high self response speed;
and S5, after the response of the power plant unit is followed, the output of the electrochemical and flywheel hybrid energy storage system is gradually reduced so as to ensure that the combined output of the electrochemical and flywheel hybrid energy storage system and the power plant unit is consistent with a power grid dispatching frequency modulation instruction.
In an alternative embodiment, when flywheel energy storage device 202 and electrochemical energy storage device 102 in the electrochemical and flywheel hybrid energy storage system operate, an optimal capacity ratio of discharging/charging and a corresponding optimal control strategy need to be selected according to a specific electricity utilization field.
In fig. 4, a curve of a section is a power grid dispatching frequency modulation instruction process, a curve of a section b is a response curve of the electrochemical and flywheel hybrid energy storage system to the power grid dispatching frequency modulation instruction, a curve of a section c is a response curve of the power plant unit to the power grid dispatching frequency modulation instruction, and the analysis of fig. 4 is performed, and the results are as follows: when the power grid dispatching frequency modulation instruction is issued to the power plant unit, the electrochemistry and flywheel hybrid energy storage system simultaneously acquires the frequency modulation instruction, because the response speed of the power plant unit is slow (minute level), the electrochemistry and flywheel hybrid energy storage system utilizes the characteristic of high response speed (second level) of the electrochemistry and flywheel hybrid energy storage system to make up the power difference between the output of the power plant unit and the frequency modulation instruction in a short time, after the response of the power plant unit to be generated is followed, the output of the electrochemistry and flywheel hybrid energy storage system can be gradually reduced to ensure that the output of the electrochemistry and flywheel hybrid energy storage system and the power plant unit are consistent with the frequency modulation instruction, and the next frequency modulation instruction response is prepared.
According to the device of the combined electrochemistry and flywheel hybrid energy storage system of the power plant unit, when a power grid needs to raise/lower load frequency modulation, the electrochemistry energy storage device 102 and the flywheel energy storage device 202 are preferentially controlled to perform corresponding actions, the device has the advantages of high adjustment speed, short response time and high adjustment precision, the problems of large equipment abrasion caused by frequent starting and stopping of auxiliary equipment and a main steam throttle and actions when the power plant unit responds to a frequency modulation instruction can be effectively solved, the service lives of main and auxiliary equipment are prolonged, the failure rate is reduced, the unit desulfurization and denitration control difficulty and the ammonia spraying usage amount are reduced, and the nitrogen oxide discharged by the unit is reduced; frequent and violent changes of boiler operation parameters are reduced, air distribution is gentle, boiler tube abrasion is reduced, and the safe operation time of the boiler is prolonged; the impact on the power grid when the renewable energy is merged into the power grid is reduced; when the high-power auxiliary machine is started or not stopped, the instantaneous voltage fluctuates, the electrochemical energy storage device 102 and the flywheel energy storage device 202 can rapidly supplement or absorb the part of energy, the bus voltage is maintained to be stable, and the safe operation of a high-power plant is ensured.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. An electrochemical and flywheel hybrid energy storage system is characterized by comprising an electrochemical energy storage device (102), a battery management system (103), a flywheel energy storage device (202), a flywheel control system (203), an energy storage energy management system, an energy storage auxiliary frequency modulation control device set, a bidirectional converter set and a transformer set; the energy storage energy management system is in communication connection with the electrochemical energy storage device (102), the battery management system (103), the flywheel energy storage device (202), the flywheel control system (203), the energy storage auxiliary frequency modulation control device set, the bidirectional converter set and the transformer set;
the energy storage auxiliary frequency modulation control device set comprises an energy storage auxiliary frequency modulation control device I (301) and an energy storage auxiliary frequency modulation control device II (302); the bidirectional converter group comprises a first bidirectional converter (101) and a second bidirectional converter (201); the transformer group comprises a first transformer (104) and a second transformer (204);
the battery management system (103) is connected with the electrochemical energy storage devices (102) in a one-to-one correspondence manner to form an electrochemical energy storage unit; the bidirectional converter I (101) is respectively connected with the transformer I (104) and the battery management system (103); the flywheel control systems (203) are connected with the flywheel energy storage devices (202) in a one-to-one corresponding mode to form a flywheel energy storage unit; the bidirectional converter II (201) is respectively connected with the transformer II (204) and the flywheel control system (203); the first transformer (104) and the second transformer (204) are simultaneously connected with the working bus; the energy storage auxiliary frequency modulation control device I (301) is connected with the bidirectional converter I (101), the battery management system (103) and the power plant unit; and the second energy storage auxiliary frequency modulation control device (302) is connected with the second bidirectional converter (201), the flywheel control system (203) and the power plant unit.
2. The electrochemical and flywheel hybrid energy storage system of claim 1, wherein the electrochemical energy storage cells are arranged in a plurality of groups.
3. An electrochemical and flywheel hybrid energy storage system according to claim 1, characterized in that the first energy storage auxiliary frequency modulation control device (301) and the first bidirectional current transformer (101) are arranged in one-to-one correspondence with the electrochemical energy storage units.
4. The electrochemical and flywheel hybrid energy storage system of claim 1, wherein the flywheel energy storage units are provided in a plurality of groups.
5. The electrochemical and flywheel hybrid energy storage system according to claim 1, wherein the second energy storage auxiliary frequency modulation control device (302) and the second bidirectional converter (201) are arranged in one-to-one correspondence with the flywheel energy storage units.
6. An electrochemical and flywheel hybrid energy storage system according to claim 1, wherein the first energy storage auxiliary frequency modulation control device (301) and the second energy storage auxiliary frequency modulation control device (302) are provided with a primary frequency modulation control unit and an AGC frequency modulation control unit.
7. An apparatus for a power plant unit combined electrochemical and flywheel hybrid energy storage system, comprising a power plant unit and the electrochemical and flywheel hybrid energy storage system of any one of claims 1 to 6; the power plant unit is provided with a control unit; the control unit is connected with an energy storage auxiliary frequency modulation control device set in the electrochemical and flywheel hybrid energy storage system.
8. The device of the combined electrochemical and flywheel hybrid energy storage system of the power plant unit as claimed in claim 7, wherein the device is operated by the following steps:
s1, issuing a power grid dispatching frequency modulation instruction to a power plant unit, and simultaneously acquiring the frequency modulation instruction by the electrochemical and flywheel hybrid energy storage system;
s2, when the frequency modulation instruction is a load ascending/descending instruction, the electrochemistry and flywheel hybrid energy storage system correspondingly carries out discharging/charging, wherein the flywheel energy storage device (202) carries out discharging/charging with short time and low power, and the electrochemistry energy storage device (102) carries out discharging/charging with long time and high power;
s3, judging whether the flywheel energy storage device (202) and the electrochemical energy storage device (102) can meet the demand of the command or not, and if the demand can be met, avoiding the synchronous response of the generating set of the power plant;
s4, if the flywheel energy storage device (202) and the electrochemical energy storage device (102) cannot meet the demand requirement, the electrochemical and flywheel hybrid energy storage system firstly makes up the power difference between the power generation plant set output and the frequency modulation demand in a short time by utilizing the characteristic of high self response speed;
and S5, after the response of the power plant unit is followed, the output of the electrochemical and flywheel hybrid energy storage system is gradually reduced so as to ensure that the combined output of the electrochemical and flywheel hybrid energy storage system and the power plant unit is consistent with a power grid dispatching frequency modulation instruction.
9. The device of the combined electrochemical and flywheel hybrid energy storage system of the power plant unit as claimed in claim 8, wherein when the flywheel energy storage device (202) and the electrochemical energy storage device (102) in the electrochemical and flywheel hybrid energy storage system work, the optimal capacity ratio of discharging/charging and the corresponding optimal control strategy need to be selected according to the specific power utilization field.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113346560A (en) * | 2021-06-03 | 2021-09-03 | 山东中实易通集团有限公司 | Primary frequency modulation function control method and system for assisting nuclear power generating unit by using hybrid energy storage |
| CN113471994A (en) * | 2021-06-29 | 2021-10-01 | 坎德拉(深圳)新能源科技有限公司 | Flywheel energy storage based power grid composite frequency modulation system and method |
| CN114156912A (en) * | 2021-11-30 | 2022-03-08 | 中国华能集团清洁能源技术研究院有限公司 | Energy management method and system for primary frequency modulation by hybrid energy storage |
| CN114221356A (en) * | 2021-12-07 | 2022-03-22 | 中节能风力发电股份有限公司 | Hybrid energy storage based frequency disturbance suppression method and system |
| CN114825483A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Thermal power generating unit frequency modulation system, method and device |
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2021
- 2021-01-06 CN CN202110011378.1A patent/CN112737129A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113346560A (en) * | 2021-06-03 | 2021-09-03 | 山东中实易通集团有限公司 | Primary frequency modulation function control method and system for assisting nuclear power generating unit by using hybrid energy storage |
| CN113471994A (en) * | 2021-06-29 | 2021-10-01 | 坎德拉(深圳)新能源科技有限公司 | Flywheel energy storage based power grid composite frequency modulation system and method |
| CN114156912A (en) * | 2021-11-30 | 2022-03-08 | 中国华能集团清洁能源技术研究院有限公司 | Energy management method and system for primary frequency modulation by hybrid energy storage |
| CN114156912B (en) * | 2021-11-30 | 2023-07-28 | 中国华能集团清洁能源技术研究院有限公司 | Energy management method and system for primary frequency modulation by using hybrid energy storage |
| CN114221356A (en) * | 2021-12-07 | 2022-03-22 | 中节能风力发电股份有限公司 | Hybrid energy storage based frequency disturbance suppression method and system |
| CN114221356B (en) * | 2021-12-07 | 2022-06-14 | 中节能风力发电股份有限公司 | Hybrid energy storage based frequency disturbance suppression method and system |
| CN114825483A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Thermal power generating unit frequency modulation system, method and device |
| CN114825483B (en) * | 2022-06-29 | 2022-09-20 | 西安热工研究院有限公司 | Thermal power generating unit frequency modulation system, method and device |
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