CN219436653U - Flywheel energy storage system and thermal power generating unit frequency modulation system - Google Patents
Flywheel energy storage system and thermal power generating unit frequency modulation system Download PDFInfo
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- CN219436653U CN219436653U CN202223594298.2U CN202223594298U CN219436653U CN 219436653 U CN219436653 U CN 219436653U CN 202223594298 U CN202223594298 U CN 202223594298U CN 219436653 U CN219436653 U CN 219436653U
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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
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- 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 present disclosure proposes a flywheel energy storage system and thermal power generating unit frequency modulation system, wherein the flywheel energy storage system includes: flywheel energy storage device; the switching assembly is used for switching the paths between the first output end of the flywheel energy storage device and the second output end of the flywheel energy storage device and the first thermal power unit station power system and the second thermal power unit station power system. In the flywheel energy storage system and the thermal power unit frequency modulation system, the flywheel energy storage device can be shared by the first thermal power unit station power system and the second thermal power unit station power system, and the flexible switching of the first output end and the second output end of the flywheel energy storage device and the passage between the first thermal power unit station power system and the second thermal power unit station power system is realized, so that the flywheel energy storage device can flexibly operate, the frequency modulation capability of the thermal power unit is further effectively improved, and the cooperative power generation requirements of new energy power generating units such as wind power, photovoltaic power and the like and the thermal power unit are met.
Description
Technical Field
The disclosure relates to the technical field of electric power frequency modulation, in particular to a flywheel energy storage system and a thermal power generating unit frequency modulation system.
Background
With the rapid development of new energy power generation such as wind power, photovoltaic and the like, the randomness fluctuation of the power generation power of the power system is increased, the system frequency adjustment task is aggravated, at present, the power system frequency adjustment task is mainly borne by a thermal power generating unit, but the comprehensive frequency modulation performance of the thermal power generating unit is general, and the frequency modulation is required to be carried out by matching with an energy storage technology.
The flywheel energy storage technology belongs to a physical energy storage technology, has the advantages of long cycle life, high response speed, high control precision and the like, and although the flywheel energy storage can assist the thermal power unit to carry out frequency adjustment, the operation flexibility of the flywheel energy storage still has a larger lifting space, so the flywheel energy storage needs to be improved to further improve the frequency modulation capability of the thermal power unit.
Disclosure of Invention
The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.
To this end, an object of the present disclosure is to provide a flywheel energy storage system and thermal power generating unit frequency modulation system.
To achieve the above object, a first aspect of the present disclosure provides a flywheel energy storage system, including: flywheel energy storage device; the first input end of the switching component is connected with the first output end of the flywheel energy storage device, the second input end of the switching component is connected with the second output end of the flywheel energy storage device, the first output end of the switching component is connected with the input end of the first thermal power unit plant power system, and the second output end of the switching component is connected with the input end of the second thermal power unit plant power system; the switching component is used for switching the paths between the first output end of the flywheel energy storage device, the second output end of the flywheel energy storage device, the first thermal power unit station power system and the second thermal power unit station power system.
Optionally, the flywheel energy storage device includes: the first energy storage bus is connected with the first input end of the switching assembly; the output ends of the first flywheel energy storage arrays are connected with the first energy storage buses; the second energy storage bus is connected with the second input end of the switching assembly; the output ends of the second flywheel energy storage arrays are connected with the second energy storage buses.
Optionally, the first flywheel energy storage array and the second flywheel energy storage array each include: the output end of the step-up transformer of the first flywheel energy storage array is connected with the first energy storage bus, and the output end of the step-up transformer of the second flywheel energy storage array is connected with the second energy storage bus; and the output ends of the flywheel energy storage units are connected with the input ends of the step-up transformers.
Optionally, the flywheel energy storage unit includes: the alternating current output end of the first converter is connected with the input end of the step-up transformer; the direct current output end of the second converter is connected with the direct current input end of the first converter; and the output end of the flywheel energy storage component is connected with the alternating current input end of the second converter.
Optionally, the first thermal power generating unit station service power system includes: the first bus group is connected with the first output end of the switching assembly; the second thermal power generating unit station service power system comprises: and the second bus group is connected with the second output end of the switching assembly.
Optionally, the first busbar group includes: a first factory bus and a second factory bus; the second busbar set includes: a third factory bus and a fourth factory bus; the switching assembly includes: the first end of the first switch is connected with the first energy storage bus, and the second end of the first switch is connected with the first factory bus; the first end of the second switch is connected with the first energy storage bus, and the second end of the second switch is connected with the third factory bus; the first end of the third switch is connected with the second energy storage bus, and the second end of the third switch is connected with the second factory bus; the first end of the fourth switch is connected with the second energy storage bus, and the second end of the fourth switch is connected with the fourth factory bus; wherein any one of the first switch and the second switch is turned on simultaneously with any one of the third switch and the fourth switch.
Optionally, the first switch, the second switch, the third switch and the fourth switch are all circuit breakers.
Optionally, the first busbar group includes: a fifth factory bus; the second busbar set includes: a sixth factory bus; the switching assembly includes: the first end of the fifth switch is connected with the first energy storage bus, and the second end of the fifth switch is connected with the fifth factory bus; the first end of the sixth switch is connected with the second energy storage bus, and the second end of the sixth switch is connected with the sixth factory bus; a seventh switch, wherein a first end of the seventh switch is connected with the first energy storage bus, and a second end of the seventh switch is connected with the second energy storage bus; wherein any two of the fifth switch, the sixth switch, and the seventh switch are turned on simultaneously.
Optionally, the fifth switch, the sixth switch and the seventh switch are all circuit breakers.
The second aspect of the present disclosure provides a thermal power generating unit frequency modulation system, comprising: the flywheel energy storage system as provided in the first aspect of the present disclosure.
The technical scheme provided by the disclosure can comprise the following beneficial effects:
through the setting of switching element, not only realize that first thermal power unit station service electrical system and second thermal power unit station service electrical system can share a flywheel energy storage device, but also realize the nimble switching of passageway between flywheel energy storage device first output and second output and first thermal power unit station service electrical system and the second thermal power unit station electrical system to make flywheel energy storage device can nimble operation, and then effectively promoted the frequency modulation ability of thermal power unit, satisfied new forms of energy generating set such as wind-powered electricity generation, photovoltaic and thermal power unit's cooperation power generation demand.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a flywheel energy storage system according to an embodiment of the disclosure;
FIG. 2 is a schematic diagram of a first flywheel energy storage array or a second flywheel energy storage array in a flywheel energy storage system according to an embodiment of the disclosure;
FIG. 3 is a schematic diagram of a flywheel energy storage system according to an embodiment of the disclosure;
FIG. 4 is a schematic diagram of a flywheel energy storage system according to an embodiment of the disclosure;
as shown in the figure: 1. flywheel energy storage device;
11. the first energy storage bus, 12, the second energy storage bus, 13, the first flywheel energy storage array, 14 and the second flywheel energy storage array;
141. a step-up transformer, 142, flywheel energy storage unit;
1421. the first converter, 1422, the second converter, 1423 and the flywheel energy storage component;
2. a switching assembly;
21. a first switch, 22, a second switch, 23, a third switch, 24, a fourth switch, 25, a fifth switch, 26, a sixth switch, 27, a seventh switch;
3. a first thermal power plant station service system;
31. a first busbar set 311, a first factory busbar, 312, a second factory busbar, 313 and a fifth factory busbar;
4. the second thermal power generating unit station service power system;
41. second bus group 411, third bus, 412, fourth bus, 413, sixth bus.
Detailed Description
Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present disclosure and are not to be construed as limiting the present disclosure. On the contrary, the embodiments of the disclosure include all alternatives, modifications, and equivalents as may be included within the spirit and scope of the appended claims.
As shown in fig. 1, fig. 3 and fig. 4, an embodiment of the disclosure proposes a flywheel energy storage system, including a flywheel energy storage device 1 and a switching component 2, a first input end of the switching component 2 is connected with a first output end of the flywheel energy storage device 1, a second input end of the switching component 2 is connected with a second output end of the flywheel energy storage device 1, a first output end of the switching component 2 is connected with an input end of a first thermal power unit plant power system 3, a second output end of the switching component 2 is connected with an input end of a second thermal power unit plant power system 4, wherein the switching component 2 is used for switching a path between the first output end of the flywheel energy storage device 1 and the second output end of the flywheel energy storage device 1 and the first thermal power unit plant power system 3 and the second thermal power unit plant power system 4.
It can be appreciated that through the setting of the switching component 2, not only the first thermal power unit station power system 3 and the second thermal power unit station power system 4 can share one flywheel energy storage device 1, but also the flexible switching of the first output end and the second output end of the flywheel energy storage device 1 and the passage between the first thermal power unit station power system 3 and the second thermal power unit station power system 4 is realized, so that the flywheel energy storage device 1 can flexibly operate, the frequency modulation capability of the thermal power unit is further effectively improved, and the cooperative power generation requirements of new energy power generating units such as wind power, photovoltaic and the like and the thermal power unit are met.
It should be noted that, the flywheel energy storage means that the motor is used to drive the flywheel to rotate at a high speed, and when the flywheel is used to drive the generator to generate electricity, the flywheel energy storage is used as the prior art, and the working principle is not described here again.
As shown in fig. 1, 3 and 4, in some embodiments, the flywheel energy storage device 1 includes a first energy storage bus 11, a plurality of first flywheel energy storage arrays 13, a second energy storage bus 12, and a plurality of second flywheel energy storage arrays 14, the first energy storage bus 11 is connected to a first input of the switching assembly 2, an output of the first flywheel energy storage array 13 is connected to the first energy storage bus 11, the second energy storage bus 12 is connected to a second input of the switching assembly 2, and an output of the second flywheel energy storage array 14 is connected to the second energy storage bus 12.
It can be understood that the plurality of first flywheel energy storage arrays 13 convey the stored electric energy to the first thermal power unit station power system 3 and the second thermal power unit station power system 4 through the first energy storage bus 11, the plurality of second flywheel energy storage arrays 14 convey the stored electric energy to the first thermal power unit station power system 3 and the second thermal power unit station power system 4 through the second energy storage bus 12, the thermal power unit is ensured to flexibly utilize the plurality of first flywheel energy storage arrays 13 and the plurality of second flywheel energy storage arrays 14 to carry out frequency adjustment under the switching of the switching assembly 2, and the frequency modulation capability of the thermal power unit is effectively improved.
The plurality of first flywheel energy storage arrays 13 are connected in parallel, and the plurality of second flywheel energy storage arrays 14 are connected in parallel, so that when a single first flywheel energy storage array 13 or a single second flywheel energy storage array 14 fails, the influence of the failure on the flywheel energy storage device 1 can be reduced, the flywheel energy storage device 1 can still stably supply power to the first thermal power unit station power system 3 and the second thermal power unit station power system 4, and the safe operation of the first thermal power unit station power system 3 and the second thermal power unit station power system 4 is ensured.
Through the structure setting of first energy storage busbar 11 and a plurality of first flywheel energy storage array 13 and second energy storage busbar 12 and a plurality of second flywheel energy storage array 14, realize the hierarchical management and control of flywheel energy storage device 1, not only effectively simplified flywheel energy storage system's wiring complexity, reduced flywheel energy storage system holistic use cost, but also can nimble setting up flywheel energy storage device 1's capacity, make flywheel energy storage system's operation flexibility higher.
It should be noted that the specific number of the first flywheel energy storage array 13 and the second flywheel energy storage array 14 may be set according to actual needs, which is not limited thereto, and the number of the first flywheel energy storage array 13 and the second flywheel energy storage array 14 may be the same or different.
The first energy storage bus 11 and the second energy storage bus 12 are used for collecting and transmitting electric energy, specific types of the first energy storage bus 11 and the second energy storage bus 12 can be set according to actual needs, the specific types are not limited, and the voltage levels of the first energy storage bus 11 and the second energy storage bus 12 are the same as those of the first thermal power unit station power system 3 and the second thermal power unit station power system 4 by way of example.
As shown in fig. 1 and 2, in some embodiments, each 5 of the first flywheel energy storage array 13 and the second flywheel energy storage array 14 includes a step-up transformer 141 and a plurality of flywheel energy storage cells 142, the step-up transformer 141 of the first flywheel energy storage array 13 outputting
The output end of the step-up transformer 141 of the second flywheel energy storage array 14 is connected with the second energy storage bus 12, and the output end of the flywheel energy storage unit 142 is connected with the input end of the step-up transformer 141.
It will be appreciated that in the first flywheel energy storage array 13, the plurality of flywheel energy storage units 142 boost the stored electrical energy
The step-up transformer 141 is used for boosting the electric energy, and the step-up transformer 141 is used for transmitting the boosted electric energy to the first power unit plant 0 power utilization system 3 and the second power unit plant power utilization system 4 through the first energy storage bus 11, and in the second flywheel energy storage array 14, a plurality of flywheels store energy
The unit 142 transmits the stored electric energy to the step-up transformer 141, and the step-up transformer 141 boosts the electric energy and transmits the boosted electric energy to the first thermal power unit station power system 3 and the second thermal power unit station power system 4 through the second energy storage bus 12. Therefore, the thermal power unit is ensured to flexibly utilize the plurality of first flywheel energy storage arrays 13 and the plurality of second flywheel energy storage arrays 14 to carry out frequency adjustment under the switching of the switching assembly 2, and the frequency modulation capability of the thermal power unit is effectively improved.
5, because the flywheel energy storage units 142 are connected in parallel, when a single flywheel energy storage unit 142 fails,
the flywheel energy storage device can only influence the operation of the flywheel energy storage array where the flywheel energy storage device is located, but cannot cause larger-range influence, so that the flywheel energy storage device 1 can still stably supply power to the first thermal power unit station power system 3 and the second thermal power unit station power system 4, and the safe operation of the first thermal power unit station power system 3 and the second thermal power unit station power system 4 is ensured.
Through the structural arrangement of the step-up transformer 141 and the plurality of flywheel energy storage units 142, the hierarchical 0-layer hierarchical control of the flywheel energy storage device 1 is realized, the wiring complexity of the flywheel energy storage system is effectively simplified, the use cost of the whole flywheel energy storage system is reduced,
and the capacity of the flywheel energy storage device 1 can be flexibly set, and meanwhile, the capacity adjustment precision of the flywheel energy storage device 1 is improved, so that the operation flexibility of the flywheel energy storage system is higher.
It should be noted that the specific number of flywheel energy storage units 142 may be set according to actual needs, which is not limited.
The 5 step-up transformer 141 is used for voltage conversion and boosting, and the specific type of the step-up transformer 141 can be selected according to actual requirements
The row arrangement is not limited in this regard.
As shown in fig. 2, in some embodiments, the flywheel energy storage unit 142 includes a first current transformer 1421, a second current transformer 1422, and a flywheel energy storage assembly 1423, the ac output of the first current transformer 1421 is connected to the input of the step-up transformer 141,
the dc output of the second current transformer 1422 is connected to the dc input of the first current transformer 1421, and the output of the flywheel energy storage assembly 14230 is connected to the ac input of the second current transformer 1422.
It can be appreciated that the flywheel energy storage component 1423 outputs an alternating current, the first converter 1421 converts the alternating current into a direct current, the second converter 1422 converts the direct current into an alternating current again and transmits the alternating current to the step-up transformer 141, thereby effectively reducing the loss in the electric energy transmission process and improving the electric energy transmission efficiency between the flywheel energy storage component 1423 and the first thermal power generating unit plant power system 3 and the second thermal power generating unit plant power system 4.
The flywheel energy storage component 1423 converts kinetic energy stored by the flywheel into electric energy to be transmitted to the first thermal power unit station power system 3 and the second thermal power unit station power system 4, so that the thermal power unit can flexibly utilize the plurality of flywheel energy storage units 142 to carry out frequency adjustment under the switching of the switching component 2, and the frequency modulation capability of the thermal power unit is effectively improved.
It should be noted that the specific types of the flywheel energy storage assembly 1423, the first converter 1421, and the second converter 1422 may be set according to actual needs, which is not limited.
As shown in fig. 1, 3 and 4, in some embodiments, the first thermal power plant power system 3 includes a first bus bar group 31, the first bus bar group 31 is connected to the first output end of the switching assembly 2, and the second thermal power plant power system 4 includes a second bus bar group 41, and the second bus bar group 41 is connected to the second output end of the switching assembly 2.
It can be understood that the collection and transmission of the electric energy output by the flywheel energy storage device 1 are realized through the arrangement of the first bus bar group 31 and the second bus bar group 41, so that the stable operation of the first thermal power unit station power system 3 and the second thermal power unit station power system 4 is ensured.
It should be noted that, the first bus bar group 31 and the second bus bar group 41 may each include one bus bar, or may include a plurality of bus bars, and the specific number of bus bars may be set according to actual needs, which is not limited.
As shown in fig. 3, in some embodiments, the first bus bar group 31 includes a first factory bus bar 311 and a second factory bus bar 312, the second bus bar group 41 includes a third factory bus bar 411 and a fourth factory bus bar 412, the switching assembly 2 includes a first switch 21, a second switch 22, a third switch 23, and a fourth switch 24, a first end of the first switch 21 is connected to the first energy storage bus bar 11, a second end of the first switch 21 is connected to the first factory bus bar 311, a first end of the second switch 22 is connected to the first energy storage bus bar 11, a second end of the second switch 22 is connected to the third factory bus bar 411, a first end of the third switch 23 is connected to the second energy storage bus bar 12, a second end of the third switch 23 is connected to the second factory bus bar 312, a first end of the fourth switch 24 is connected to the second energy storage bus bar 12, and a second end of the fourth switch 24 is connected to the fourth factory bus bar 412, wherein any one of the first switch 21 and the second switch 22 is simultaneously turned on with any one of the third switch 23 and the fourth switch 24.
It can be understood that when the first switch 21 and the third switch 23 are turned on simultaneously and the second switch 22 and the fourth switch 24 are turned off, the electric energy output by the plurality of first flywheel energy storage arrays 13 is transmitted to the first factory bus 311 through the first energy storage bus 11 for being used by the first thermal power plant system 3, and the electric energy output by the plurality of second flywheel energy storage arrays 14 is transmitted to the second factory bus 312 through the second energy storage bus 12 for being used by the first thermal power plant system 3, so as to meet the frequency modulation requirement.
When the first switch 21 and the fourth switch 24 are simultaneously turned on and the second switch 22 and the third switch 23 are both turned off, the electric energy output by the plurality of first flywheel energy storage arrays 13 is transmitted to the first plant bus 311 through the first energy storage bus 11 so as to be used by the first thermal power plant power system 3, and the electric energy output by the plurality of second flywheel energy storage arrays 14 is transmitted to the fourth plant bus 412 through the second energy storage bus 12 so as to be used by the second thermal power plant power system 4, so that the frequency modulation requirement is met.
When the second switch 22 and the third switch 23 are simultaneously turned on and the first switch 21 and the fourth switch 24 are both turned off, the electric energy output by the plurality of first flywheel energy storage arrays 13 is transmitted to the third plant bus 411 through the first energy storage bus 11 so as to be used by the second thermal power plant power system 4, and the electric energy output by the plurality of second flywheel energy storage arrays 14 is transmitted to the second plant bus 312 through the second energy storage bus 12 so as to be used by the first thermal power plant power system 3, so that the frequency modulation requirement is met.
When the second switch 22 and the fourth switch 24 are simultaneously turned on and the first switch 21 and the third switch 23 are both turned off, the electric energy output by the plurality of first flywheel energy storage arrays 13 is transmitted to the third plant bus 411 through the first energy storage bus 11 so as to be used by the second thermal power plant power system 4, and the electric energy output by the plurality of second flywheel energy storage arrays 14 is transmitted to the fourth plant bus 412 through the second energy storage bus 12 so as to be used by the second thermal power plant power system 4, so that the frequency modulation requirement is met.
Through the arrangement of the first switch 21, the second switch 22, the third switch 23 and the fourth switch 24, flexible switching of the paths between the first flywheel energy storage arrays 13 and the second flywheel energy storage arrays 14 and the first thermal power unit station power system 3 and the second thermal power unit station power system 4 is realized, so that the flywheel energy storage device 1 can be connected into the first thermal power unit station power system 3 or the second thermal power unit station power system 4 in a full capacity manner, and can be connected into the first thermal power unit station power system 3 or the second thermal power unit station power system 4 after capacity splitting.
Therefore, flexible operation of the flywheel energy storage device 1 is realized, so that the frequency modulation capacity of the thermal power generating unit is effectively improved, and the cooperative power generation requirements of new energy generating units such as wind power, photovoltaic and the like and the thermal power generating unit are met.
It should be noted that, the on-off control of the first switch 21, the second switch 22, the third switch 23 and the fourth switch 24 may be implemented by a controller, and the specific type of the controller may be set according to actual needs, which is not limited, and the controller may be a programmable logic controller.
Wherein, since any one of the first switch 21 and the second switch 22 is simultaneously conducted with any one of the third switch 23 and the fourth switch 24, so that the first switch 21 and the second switch 22 and the third switch 23 and the fourth switch 24 are not simultaneously conducted, the first switch 21 and the second switch 22 and the third switch 23 and the fourth switch 24 can be controlled by the interlocking logic, so as to avoid the problem of simultaneous conduction between the first switch 21 and the second switch 22 and between the third switch 23 and the fourth switch 24.
The on-off control mode of the first switch 21, the second switch 22, the third switch 23 and the fourth switch 24 is suitable for the situation that the installed capacity of the flywheel energy storage system is large, and the first bus 311, the second bus 312, the third bus 411 and the fourth bus 412 are insufficient in access capacity, and by means of the arrangement of the mode, the power maximization access of the flywheel energy storage system to the first thermal power unit station power system 3 and the second thermal power unit station power system 4 can be achieved.
In some embodiments, the first switch 21, the second switch 22, the third switch 23, and the fourth switch 24 are all circuit breakers.
It can be understood that the first switch 21, the second switch 22, the third switch 23 and the fourth switch 24 are all arranged as circuit breakers, so that the on-off stability of the first switch 21, the second switch 22, the third switch 23 and the fourth switch 24 is higher, and the safe and reliable operation of the flywheel energy storage system is effectively ensured.
The circuit breaker is a switching device capable of closing, carrying and opening a current under normal loop conditions and closing, carrying and opening a current under abnormal loop conditions within a specified time, and the specific type of the circuit breaker can be set according to actual needs, which is not limited.
As shown in fig. 4, in some embodiments, the first bus bar set 31 includes a fifth factory bus bar 313, the second bus bar set 41 includes a sixth factory bus bar 413, the switching assembly 2 includes a fifth switch 25, a sixth switch 26, and a seventh switch 27, a first end of the fifth switch 25 is connected to the first energy storage bus bar 11, a second end of the fifth switch 25 is connected to the fifth factory bus bar 313, a first end of the sixth switch 26 is connected to the second energy storage bus bar 12, a second end of the sixth switch 26 is connected to the sixth factory bus bar 413, a first end of the seventh switch 27 is connected to the first energy storage bus bar 11, and a second end of the seventh switch 27 is connected to the second energy storage bus bar 12, wherein any two of the fifth switch 25, the sixth switch 26, and the seventh switch 27 are simultaneously turned on.
It can be understood that when the fifth switch 25 and the sixth switch 26 are turned on simultaneously and the seventh switch 27 is turned off, the electric energy output by the plurality of first flywheel energy storage arrays 13 is transmitted to the fifth plant bus 313 through the first energy storage bus 11 for being used by the first thermal power plant power system 3, and the electric energy output by the plurality of second flywheel energy storage arrays 14 is transmitted to the sixth plant bus 413 through the second energy storage bus 12 for being used by the second thermal power plant power system 4, so as to meet the frequency modulation requirement.
When the fifth switch 25 and the seventh switch 27 are simultaneously turned on and the sixth switch 26 is turned off, electric energy output by the plurality of first flywheel energy storage arrays 13 is conveyed to the fifth plant bus 313 through the first energy storage bus 11 so as to be used by the first thermal power plant power system 3, and electric energy output by the plurality of second flywheel energy storage arrays 14 is conveyed to the fifth plant bus 313 through the second energy storage bus 12 and the first energy storage bus 11 so as to be used by the first thermal power plant power system 3, so that the frequency modulation requirement is met.
When the sixth switch 26 and the seventh switch 27 are simultaneously turned on and the fifth switch 25 is turned off, the electric energy output by the plurality of first flywheel energy storage arrays 13 is conveyed to the sixth plant bus 413 through the first energy storage bus 11 and the second energy storage bus 12 so as to be used by the second thermal power plant power system 4, and the electric energy output by the plurality of second flywheel energy storage arrays 14 is conveyed to the sixth plant bus 413 through the second energy storage bus 12 so as to be used by the second thermal power plant power system 4, so that the frequency modulation requirement is met.
Through the arrangement of the fifth switch 25, the sixth switch 26 and the seventh switch 27, flexible switching of the paths between the first flywheel energy storage arrays 13 and the second flywheel energy storage arrays 14 and the first thermal power unit power plant system 3 and the second thermal power unit power plant system 4 is realized, so that the flywheel energy storage device 1 can be connected into the first thermal power unit power plant system 3 or the second thermal power unit power plant system 4 in a full capacity manner, and can be connected into the first thermal power unit power plant system 3 or the second thermal power unit power plant system 4 after capacity splitting.
Therefore, flexible operation of the flywheel energy storage device 1 is realized, so that the frequency modulation capacity of the thermal power generating unit is effectively improved, and the cooperative power generation requirements of new energy generating units such as wind power, photovoltaic and the like and the thermal power generating unit are met.
Note that, the on-off control of the fifth switch 25, the sixth switch 26 and the seventh switch 27 may also be implemented by the controller, and any two of the fifth switch 25, the sixth switch 26 and the seventh switch 27 are turned on simultaneously, so that the fifth switch 25, the sixth switch 26 and the seventh switch 27 may be controlled by the logic of taking two three to two, so as to avoid the problem of simultaneous conduction among the fifth switch 25, the sixth switch 26 and the seventh switch 27.
The specific types of the first, second, third, fourth, fifth, and sixth plant buses 311, 312, 411, 412, 313, and 413 for collection and transmission of electric energy may be set according to actual needs, and the voltage levels of the first, second, third, and fourth plant buses 311, 312, 411, and 412 are all voltage levels required in the first and second thermal power unit plant electric systems 3 and 4, and the fifth plant bus 313 may be the first, second, or third plant bus 311, 312, and the sixth plant bus 413 may be the third, 411, or the fourth plant bus 412, for example.
The second mode is particularly suitable for the condition that the total installed power of flywheel energy storage is not large, the connection capacity of the section bus of a single-section medium-voltage plant of the thermal power generating unit is sufficient, and the flywheel energy storage system is connected to the single-section bus of the single thermal power generating unit, so that the number of flywheel energy storage and side/outlet switches of the unit can be saved, and the investment is saved.
The on-off control mode of the fifth switch 25, the sixth switch 26 and the seventh switch 27 is suitable for the situation that the installed capacity of the flywheel energy storage system is small, and the first factory bus 311, the second factory bus 312, the third factory bus 411 and the fourth factory bus 412 are sufficient in access capacity, and by means of the arrangement of the mode, the number of wires and the switches can be reduced, and the cost of the flywheel energy storage system is reduced.
In some embodiments, the fifth switch 25, the sixth switch 26, and the seventh switch 27 are all circuit breakers.
It can be appreciated that by setting the fifth switch 25, the sixth switch 26 and the seventh switch 27 as circuit breakers, the on-off stability of the fifth switch 25, the sixth switch 26 and the seventh switch 27 is higher, and the safe and reliable operation of the flywheel energy storage system is effectively ensured.
The embodiment of the disclosure also provides a thermal power generating unit frequency modulation system, which comprises the flywheel energy storage system as the embodiment of the disclosure.
It can be appreciated that through the setting of the switching component 2, not only the first thermal power unit station power system 3 and the second thermal power unit station power system 4 can share one flywheel energy storage device 1, but also the flexible switching of the first output end and the second output end of the flywheel energy storage device 1 and the passage between the first thermal power unit station power system 3 and the second thermal power unit station power system 4 is realized, so that the flywheel energy storage device 1 can flexibly operate, the frequency modulation capability of the thermal power unit is further effectively improved, and the cooperative power generation requirements of new energy power generating units such as wind power, photovoltaic and the like and the thermal power unit are met.
Taking a flywheel energy storage device 1 with the weight of 18MW/4.5MW, a first thermal power unit station power system 3 with the weight of 600MW and a second thermal power unit station power system 4 with the weight of 600MW as an example.
The number of flywheel energy storage arrays in the flywheel energy storage device 1 is 9, each flywheel energy storage array is 2000W/500kWh, the number of flywheel energy storage units 142 in each flywheel energy storage array is 4, the number of step-up transformers 141 is one, each flywheel energy storage unit 142 is 500kW/125kWh, and each step-up transformer 141 is 2000kVA.
The number of the first flywheel energy storage arrays 13 is 3, the number of the 3 first flywheel energy storage arrays 13 is 6MW/1.5MWh, the number of the second flywheel energy storage arrays 14 is 6, and the number of the 6 second flywheel energy storage arrays 14 is 12MW/3MWh.
The flywheel energy storage system is controlled to be on-off with the first thermal power unit station service system 3 and the second thermal power unit station service system 4 through a first switch 21, a second switch 22, a third switch 23 and a fourth switch 24.
When the first switch 21 and the third switch 23 are simultaneously turned on and the second switch 22 and the fourth switch 24 are both turned off, all of the 3 first flywheel energy storage arrays 13 with the power of 6MW/1.5MWh and the 6 second flywheel energy storage arrays 14 with the power of 12MW/3MWh are connected to the first thermal power unit station power system 3 to assist the first thermal power unit to perform frequency modulation.
When the first switch 21 and the fourth switch 24 are simultaneously turned on and the second switch 22 and the third switch 23 are turned off, the 3 first flywheel energy storage arrays 13 with the power of 6MW/1.5MWh are connected to the first thermal power unit station power system 3 to assist the first thermal power unit in frequency modulation, and the 6 second flywheel energy storage arrays 14 with the power of 12MW/3MWh are connected to the second thermal power unit station power system 4 to assist the second thermal power unit in frequency modulation.
When the second switch 22 and the third switch 23 are simultaneously turned on and the first switch 21 and the fourth switch 24 are both turned off, the 3 first flywheel energy storage arrays 13 with the power of 6MW/1.5MWh are connected to the second thermal power unit station power system 4 to assist in frequency modulation of the second thermal power unit, and the 6 second flywheel energy storage arrays 14 with the power of 12MW/3MWh are connected to the first thermal power unit station power system 3 to assist in frequency modulation of the first thermal power unit.
When the second switch 22 and the fourth switch 24 are simultaneously turned on and the first switch 21 and the third switch 23 are both turned off, all of the 3 first flywheel energy storage arrays 13 with the power of 6MW/1.5MWh and the 6 second flywheel energy storage arrays 14 with the power of 12MW/3MWh are connected to the second thermal power plant power system 4 to assist the second thermal power plant to perform frequency modulation.
It should be noted that in the description of the present disclosure, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present disclosure in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present disclosure have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the present disclosure.
Claims (10)
1. A flywheel energy storage system, comprising:
flywheel energy storage device;
the first input end of the switching component is connected with the first output end of the flywheel energy storage device, the second input end of the switching component is connected with the second output end of the flywheel energy storage device, the first output end of the switching component is connected with the input end of the first thermal power unit plant power system, and the second output end of the switching component is connected with the input end of the second thermal power unit plant power system;
the switching component is used for switching the paths between the first output end of the flywheel energy storage device, the second output end of the flywheel energy storage device, the first thermal power unit station power system and the second thermal power unit station power system.
2. The flywheel energy storage system of claim 1, wherein the flywheel energy storage device comprises:
the first energy storage bus is connected with the first input end of the switching assembly;
the output ends of the first flywheel energy storage arrays are connected with the first energy storage buses;
the second energy storage bus is connected with the second input end of the switching assembly;
the output ends of the second flywheel energy storage arrays are connected with the second energy storage buses.
3. The flywheel energy storage system of claim 2, wherein the first flywheel energy storage array and the second flywheel energy storage array each comprise:
the output end of the step-up transformer of the first flywheel energy storage array is connected with the first energy storage bus, and the output end of the step-up transformer of the second flywheel energy storage array is connected with the second energy storage bus;
and the output ends of the flywheel energy storage units are connected with the input ends of the step-up transformers.
4. The flywheel energy storage system of claim 3, wherein the flywheel energy storage unit comprises:
the alternating current output end of the first converter is connected with the input end of the step-up transformer;
the direct current output end of the second converter is connected with the direct current input end of the first converter;
and the output end of the flywheel energy storage component is connected with the alternating current input end of the second converter.
5. The flywheel energy storage system of claim 2, wherein the flywheel comprises a flywheel housing,
the first thermal power generating unit station service power system comprises: the first bus group is connected with the first output end of the switching assembly;
the second thermal power generating unit station service power system comprises: and the second bus group is connected with the second output end of the switching assembly.
6. The flywheel energy storage system of claim 5, wherein the flywheel comprises a first pump,
the first busbar set includes: a first factory bus and a second factory bus;
the second busbar set includes: a third factory bus and a fourth factory bus;
the switching assembly includes:
the first end of the first switch is connected with the first energy storage bus, and the second end of the first switch is connected with the first factory bus;
the first end of the second switch is connected with the first energy storage bus, and the second end of the second switch is connected with the third factory bus;
the first end of the third switch is connected with the second energy storage bus, and the second end of the third switch is connected with the second factory bus;
the first end of the fourth switch is connected with the second energy storage bus, and the second end of the fourth switch is connected with the fourth factory bus;
wherein any one of the first switch and the second switch is turned on simultaneously with any one of the third switch and the fourth switch.
7. The flywheel energy storage system of claim 6, wherein the first switch, the second switch, the third switch, and the fourth switch are all circuit breakers.
8. The flywheel energy storage system of claim 5, wherein the flywheel comprises a first pump,
the first busbar set includes: a fifth factory bus;
the second busbar set includes: a sixth factory bus;
the switching assembly includes:
the first end of the fifth switch is connected with the first energy storage bus, and the second end of the fifth switch is connected with the fifth factory bus;
the first end of the sixth switch is connected with the second energy storage bus, and the second end of the sixth switch is connected with the sixth factory bus;
a seventh switch, wherein a first end of the seventh switch is connected with the first energy storage bus, and a second end of the seventh switch is connected with the second energy storage bus;
wherein any two of the fifth switch, the sixth switch, and the seventh switch are turned on simultaneously.
9. The flywheel energy storage system of claim 8, wherein the fifth switch, the sixth switch, and the seventh switch are all circuit breakers.
10. A thermal power generating unit frequency modulation system, comprising: a flywheel energy storage system as claimed in any of claims 1 to 9.
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