CN112671014A - Flywheel energy storage variable speed power generation system - Google Patents
Flywheel energy storage variable speed power generation system Download PDFInfo
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- CN112671014A CN112671014A CN202110064162.1A CN202110064162A CN112671014A CN 112671014 A CN112671014 A CN 112671014A CN 202110064162 A CN202110064162 A CN 202110064162A CN 112671014 A CN112671014 A CN 112671014A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
A flywheel energy storage variable-speed power generation system belongs to the field of motors. The problem of current flywheel energy memory install in the direct current side, lead to power generation system structure complicacy, inefficiency and reliability poor is solved. The invention comprises a multiphase permanent magnet synchronous wind driven generator, a power converter, an induction motor/generator and an inertia flywheel; when the multiphase permanent magnet synchronous wind driven generator is provided with 1 set of stator winding, the output end of the stator winding of the multiphase permanent magnet synchronous wind driven generator is simultaneously connected with the alternating current input end of the power converter and the head end of the power winding of the induction motor/generator, alternating current output by the alternating current output end of the power converter is connected into a power grid through a transformer, and a rotor of the induction motor/generator is coaxially connected with the inertia flywheel. The invention is mainly applied to wind power generation systems and small hydroelectric power generation systems.
Description
Technical Field
The invention belongs to the field of motors, and particularly relates to a flywheel energy storage variable-speed power generation system.
Background
The research on the utilization of renewable energy is emphasized by all countries at present, and wind energy is rapidly developed due to the characteristics that the technology is relatively mature and the wind energy can be utilized in a large scale. However, the randomness and intermittency of wind speed cause the grid-connected power of the wind power plant to have large fluctuation. With the continuous expansion of the scale of wind power, the influence of the power fluctuation on the operation stability and economy of a power grid is larger and larger, and even the safe operation of the power grid is influenced. The energy storage device is introduced into the wind power generation system, so that the wind power fluctuation can be effectively inhibited, the voltage is smoothly output, the electric energy quality is improved, and the wind power generation system is a key technology and a mainstream mode for ensuring the grid-connected operation of wind power generation and promoting the utilization of wind energy.
The flywheel system has the advantages of high charging/discharging speed in an energy storage mode, high power density, long service life, small influence on the environment, small occupied space, low requirement on the external geographical environment and the like. The flywheel system is used for realizing power storage and is applied to a wind power generation system, so that the flywheel system has wide prospect.
The flywheel energy storage system has the following functions in the wind power generation system: when the flywheel energy storage system is applied to an independently operating wind power generation system, active power can be rapidly emitted or absorbed under the conditions of wind power fluctuation and load disturbance, and the balance of the emitted power and the consumed power of a wind power system is realized, so that the utilization efficiency of wind energy and the power quality of power supply are improved.
At present, the flywheel energy storage device is mainly installed in the wind power generation system at the following two positions: (1) the flywheel energy storage device is arranged on the grid-connected side; (2) the flywheel energy storage device is arranged on the direct current side. The structure diagram of the flywheel energy storage system applied to the grid-connected permanent magnet direct-drive wind power generation system is shown in fig. 1. The system comprises a direct-drive wind generating set, a flywheel energy storage system, a power converter, a load and the like, wherein the flywheel energy storage system is connected in parallel on a direct current bus.
The over-high cost is a common problem of limiting the large popularization and application of the energy storage technology in wind power generation, and the improvement of the energy conversion efficiency and the reduction of the cost are important directions for the research of the energy storage technology in future. In the wind power generation system shown in fig. 1, the energy storage motor needs to be connected in parallel to the DC bus through the AC-DC converter (that is, the flywheel energy storage device is installed on the DC side), which results in high cost, low efficiency, poor reliability and complex control system structure of the power generation system, and therefore the above problems need to be solved urgently.
Disclosure of Invention
The invention aims to solve the problems of complex structure, low efficiency and poor reliability of a power generation system caused by the fact that the conventional flywheel energy storage device is arranged on a direct current side, and provides a flywheel energy storage variable-speed power generation system which has two structures, specifically:
the first structure is as follows:
the flywheel energy storage variable speed power generation system comprises a multiphase permanent magnet synchronous wind driven generator 1, a power converter 2, an induction motor/generator 3 and an inertia flywheel 4;
the multiphase permanent magnet synchronous wind driven generator 1 is provided with 1 set of stator winding, the output end of the stator winding of the multiphase permanent magnet synchronous wind driven generator 1 is simultaneously connected with the alternating current input end of the power converter 2 and the head end of the power winding of the induction motor/generator 3, alternating current output by the alternating current output end of the power converter 2 is connected into a power grid through a transformer, and a rotor of the induction motor/generator 3 is coaxially connected with the inertia flywheel 4;
and the power converter 2 is used for converting the input alternating current into direct current and then converting the direct current into alternating current for output.
The second structure is as follows:
the flywheel energy storage variable speed power generation system comprises a multiphase permanent magnet synchronous wind driven generator 1, a power converter 2, an induction motor/generator 3 and an inertia flywheel 4;
the stator of the multiphase permanent magnet synchronous wind driven generator 1 is provided with two sets of stator windings, the output end of the first set of stator windings of the multiphase permanent magnet synchronous wind driven generator 1 is connected with the alternating current input end of the power converter 2, the output end of the second set of stator windings of the multiphase permanent magnet synchronous wind driven generator 1 is connected with the head end of the power winding of the induction motor/generator 3, alternating current output by the alternating current output end of the power converter 2 is connected into a power grid through a transformer, and the rotor of the induction motor/generator 3 is coaxially connected with the inertia flywheel 4;
and the power converter 2 is used for converting the input alternating current into direct current and then converting the direct current into alternating current for output.
For the flywheel energy storage variable-speed power generation system with the two structures, preferably, the stator of the induction motor/generator 3 is provided with two sets of windings, namely a power winding and an excitation winding, and the lead-out wire of the excitation winding of the induction motor/generator 3 is connected with the multiphase capacitor bank in parallel.
For the flywheel energy storage variable speed power generation system with the two structures, the head end of the power winding of the induction motor/generator 3 is preferably connected in parallel with a multiphase capacitor bank.
For the flywheel energy storage variable speed power generation system with the above two structures, it is preferable that the induction motor/generator 3 is a cage rotor induction motor, a solid rotor induction motor, a wound rotor induction motor, or a brushless doubly-fed induction motor.
For the flywheel energy storage variable-speed power generation system with the above two structures, it is preferable that the power converter 2 is implemented in three ways:
the first method comprises the following steps: the power converter 2 is realized by an AC/DC converter 2-1, a capacitor and a DC/AC converter 2-2; the capacitor is arranged between the direct current output end of the AC/DC converter 2-1 and the direct current input end of the DC/AC converter 2-2;
wherein, the AC input end of the AC/DC converter 2-1 is used as the AC input end of the power converter 2, and the AC output end of the DC/AC converter 2-2 is used as the AC output end of the power converter 2;
and the second method comprises the following steps: the power converter 2 is realized by an AC-AC converter;
and the third is that: the power converter 2 is implemented as an AC-DC-AC converter.
For the flywheel energy storage variable speed power generation system with the two structures, it is preferable that the power output end of the rotor of the induction motor/generator 3 is connected with a mechanical load or is connected with a wind turbine, a water turbine or other power machinery.
For the flywheel energy storage variable-speed power generation system with the second structure, preferably, the number of the two sets of stator windings on the stator of the multiphase permanent magnet synchronous wind driven generator 1 may be the same or different.
For the flywheel energy storage variable speed power generation system of the above two configurations, it is preferable that the power generation system further includes an ac chopper connected to the tail end of the power winding of the induction motor/generator 3.
The invention has the following beneficial effects:
the flywheel energy storage variable-speed power generation system mainly comprises a multiphase permanent magnet synchronous wind driven generator 1, a power converter and an emergency motor/generator 3.
The invention connects the induction motor/generator 3 for energy storage directly to the output end of the stator winding of the multiphase permanent magnet synchronous wind power generator 1, namely: the invention directly adds the induction motor/generator 3 for energy storage to the AC side of the multiphase permanent magnet synchronous wind driven generator 1, saves an AC-DC converter at the side of the energy storage motor in the prior art shown in figure 1, reduces the capacity of an AC-DC power converter at the output side of the wind driven generator, reduces the system cost, improves the system efficiency, dynamic response and reliability, and simplifies the control system.
The flywheel energy storage variable-speed power generation system saves the AC-DC converter conversion at the energy storage motor side in the prior art shown in figure 1, directly connects the energy storage motor to the AC side, reduces the primary power conversion, and has the characteristics of high energy conversion efficiency, low cost, long service life, high reliability, flexible arrangement, easy maintenance and the like. Has good application prospect in wind power generation systems and small hydroelectric power generation systems.
Drawings
FIG. 1 is a prior art structure diagram of a permanent magnet direct-drive wind power generation system with a flywheel energy storage device;
FIG. 2 is a schematic structural diagram of a flywheel energy storage variable speed power generation system according to the present invention when the multiphase permanent magnet synchronous wind turbine 1 has 1 set of stator windings;
fig. 3 is a schematic structural diagram of the flywheel energy storage variable speed power generation system according to the present invention when the multiphase permanent magnet synchronous wind power generator 1 has 2 sets of stator windings.
Detailed Description
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, and not all of the embodiments. 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.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The first embodiment is as follows: the present embodiment is described below with reference to fig. 2, and the flywheel energy storage variable speed power generation system of the present embodiment includes a multiphase permanent magnet synchronous wind power generator 1, a power converter 2, an induction motor/generator 3, and an inertia flywheel 4;
the multiphase permanent magnet synchronous wind driven generator 1 is provided with 1 set of stator winding, the output end of the stator winding of the multiphase permanent magnet synchronous wind driven generator 1 is simultaneously connected with the alternating current input end of the power converter 2 and the head end of the power winding of the induction motor/generator 3, alternating current output by the alternating current output end of the power converter 2 is connected into a power grid through a transformer, and a rotor of the induction motor/generator 3 is coaxially connected with the inertia flywheel 4;
and the power converter 2 is used for converting the input alternating current into direct current and then converting the direct current into alternating current for output.
The invention directly connects the induction motor/generator 3 for energy storage to the output end of the stator winding of the multiphase permanent magnet synchronous wind driven generator 1 in parallel, namely: the invention directly adds the induction motor/generator 3 for energy storage to the AC side of the multiphase permanent magnet synchronous wind driven generator 1, saves an AC-DC converter at the side of the energy storage motor in the prior art shown in figure 1, reduces the capacity of the AC-DC power converter at the output side of the wind driven generator, reduces the system cost, improves the system efficiency, dynamic response and reliability, and simplifies the control system.
For particular applications, the induction motor/generator 3 may not be coupled to the inertial flywheel 4 when the rotor inertia of the induction motor/generator 3 is sufficiently large.
The second embodiment is as follows: the present embodiment is described below with reference to fig. 3, and the flywheel energy storage variable speed power generation system of the present embodiment includes a multiphase permanent magnet synchronous wind power generator 1, a power converter 2, an induction motor/generator 3, and an inertia flywheel 4;
the stator of the multiphase permanent magnet synchronous wind driven generator 1 is provided with two sets of stator windings, the output end of the first set of stator windings of the multiphase permanent magnet synchronous wind driven generator 1 is connected with the alternating current input end of the power converter 2, the output end of the second set of stator windings of the multiphase permanent magnet synchronous wind driven generator 1 is connected with the head end of the power winding of the induction motor/generator 3, alternating current output by the alternating current output end of the power converter 2 is connected into a power grid through a transformer, and the rotor of the induction motor/generator 3 is coaxially connected with the inertia flywheel 4;
and the power converter 2 is used for converting the input alternating current into direct current and then converting the direct current into alternating current for output.
Referring to fig. 1 and 3, the present invention is implemented by connecting an induction motor/generator 3 for energy storage directly in parallel to the stator winding output terminal of a multiphase permanent magnet synchronous wind power generator 1, that is: the invention directly adds the induction motor/generator 3 for energy storage to the AC side of the multiphase permanent magnet synchronous wind driven generator 1, saves an AC-DC converter at the side of the energy storage motor in the prior art, reduces the capacity of an AC-DC power converter at the output side of the wind driven generator, reduces the system cost, improves the system efficiency, dynamic response and reliability, and simplifies the control system.
The present embodiment considers that when the rotor inertia of the induction motor/generator 3 is large enough, the induction motor/generator 3 may not be connected to the inertia flywheel 4, and further considers the specific connection of the components of the flywheel energy storage variable speed power generation system provided when two sets of stator windings are provided on the stator of the multiphase permanent magnet synchronous wind driven generator 1.
For particular applications, the induction motor/generator 3 may not be coupled to the inertial flywheel 4 when the rotor inertia of the induction motor/generator 3 is sufficiently large.
The third concrete implementation mode: in the following, the present embodiment is described with reference to fig. 2 and 3, and the present embodiment further describes the first or second embodiment, in which two sets of windings, i.e., a power winding and an excitation winding, are provided on the stator of the induction motor/generator 3, and the lead-out line of the excitation winding of the induction motor/generator 3 is connected in parallel with a multiphase capacitor bank.
The fourth concrete implementation mode: the present embodiment will be described with reference to fig. 2 and 3, and the present embodiment will further describe the first or second embodiment in that the power winding head end of the induction motor/generator 3 is connected in parallel with a multiphase capacitor bank.
The fifth concrete implementation mode: the present embodiment will be described with reference to fig. 2 and 3, and the present embodiment will further describe the first or second embodiment, and the induction motor/generator 3 is a cage rotor induction motor, a solid rotor induction motor, a wound rotor induction motor, or a brushless doubly-fed induction motor.
The sixth specific implementation mode: the present embodiment is described below with reference to fig. 2 and 3, and the present embodiment further describes the first or second embodiment, and the power converter 2 has three implementation manners:
the first method comprises the following steps: the power converter 2 is realized by an AC/DC converter 2-1, a capacitor and a DC/AC converter 2-2; the capacitor is arranged between the direct current output end of the AC/DC converter 2-1 and the direct current input end of the DC/AC converter 2-2;
wherein, the AC input end of the AC/DC converter 2-1 is used as the AC input end of the power converter 2, and the AC output end of the DC/AC converter 2-2 is used as the AC output end of the power converter 2;
and the second method comprises the following steps: the power converter 2 is realized by an AC-AC converter;
and the third is that: the power converter 2 is implemented as an AC-DC-AC converter.
In the preferred embodiment, when the power converter 2 is implemented by using the AC/DC converter 2-1, the capacitor and the DC/AC converter 2-2; the capacitor between the DC output of the AC/DC converter 2-1 and the DC input of the DC/AC converter 2-2 acts as a filter and a smoothing.
The seventh embodiment: the present embodiment is described below with reference to fig. 2 and 3, and the present embodiment further describes one or two embodiments, in which the power output end of the rotor of the induction motor/generator 3 is connected to a mechanical load or is connected to a wind turbine, a water turbine or other power machinery.
The specific implementation mode is eight: the present embodiment is described below with reference to fig. 2 and fig. 3, and the second embodiment is further described in the present embodiment, where the number of the two sets of stator windings on the stator of the multiphase permanent magnet synchronous wind turbine 1 may be the same or different.
The specific implementation method nine: the present embodiment will be described with reference to fig. 2 and 3, and the present embodiment further describes the first or second embodiment, and the power generation system further includes an ac chopper connected to the tail end of the power winding of the induction motor/generator 3.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (9)
1. The flywheel energy storage variable-speed power generation system is characterized by comprising a multiphase permanent magnet synchronous wind driven generator (1), a power converter (2), an induction motor/generator (3) and an inertia flywheel (4);
the multiphase permanent magnet synchronous wind driven generator (1) is provided with 1 set of stator winding, the output end of the stator winding of the multiphase permanent magnet synchronous wind driven generator (1) is simultaneously connected with the alternating current input end of the power converter (2) and the head end of the power winding of the induction motor/generator (3), alternating current output by the alternating current output end of the power converter (2) is connected into a power grid through a transformer, and a rotor of the induction motor/generator (3) is coaxially connected with the inertia flywheel (4);
and the power converter (2) is used for converting the input alternating current into direct current and then converting the direct current into alternating current for output.
2. The flywheel energy storage variable-speed power generation system is characterized by comprising a multiphase permanent magnet synchronous wind driven generator (1), a power converter (2), an induction motor/generator (3) and an inertia flywheel (4);
the stator of the multiphase permanent magnet synchronous wind driven generator (1) is provided with two sets of stator windings, the output end of the first set of stator windings of the multiphase permanent magnet synchronous wind driven generator (1) is connected with the alternating current input end of the power converter (2), the output end of the second set of stator windings of the multiphase permanent magnet synchronous wind driven generator (1) is connected with the head end of the power winding of the induction motor/generator (3), the alternating current output by the alternating current output end of the power converter (2) is connected into a power grid through a transformer, and the rotor of the induction motor/generator (3) is coaxially connected with the inertia flywheel (4);
and the power converter (2) is used for converting the input alternating current into direct current and then converting the direct current into alternating current for output.
3. The flywheel energy storage variable speed power generation system according to claim 1 or 2, characterized in that the stator of the induction motor/generator (3) has two sets of windings, which are respectively a power winding and an excitation winding, and the outgoing line of the excitation winding of the induction motor/generator (3) is connected with a multiphase capacitor bank in parallel.
4. A flywheel energy storage variable speed power generation system according to claim 1 or 2, characterised in that the power winding head end of the induction motor/generator (3) is connected in parallel with a multiphase capacitor bank.
5. The flywheel energy storage variable speed power generation system according to claim 1 or 2, characterized in that the induction motor/generator (3) is a cage rotor induction motor, a solid rotor induction motor, a wound rotor induction motor or a brushless doubly fed induction motor.
6. A flywheel energy storage variable speed power generation system according to claim 1 or 2, characterized in that the power converter (2) is implemented in three ways:
the first method comprises the following steps: the power converter (2) is realized by adopting an AC/DC converter (2-1), a capacitor and a DC/AC converter (2-2); the capacitor is arranged between the direct current output end of the AC/DC converter (2-1) and the direct current input end of the DC/AC converter (2-2);
wherein, the AC input end of the AC/DC converter (2-1) is used as the AC input end of the power converter (2), and the AC output end of the DC/AC converter (2-2) is used as the AC output end of the power converter (2);
and the second method comprises the following steps: the power converter (2) is realized by adopting an AC-AC converter;
and the third is that: the power converter (2) is realized by adopting an AC-DC-AC converter.
7. A flywheel energy storage variable speed power generation system as claimed in claim 1 or 2, characterised in that the power output end of the rotor of the induction motor/generator (3) is connected to a mechanical load or to a wind turbine, water turbine or other power machine.
8. The flywheel energy storage variable-speed power generation system according to claim 2, wherein the number of the two sets of stator windings on the stator of the multiphase permanent magnet synchronous wind driven generator (1) can be the same or different.
9. A flywheel energy storage variable speed power generation system according to claim 1 or 2, characterized in that the power generation system further comprises an ac chopper connected to the tail end of the power winding of the induction motor/generator (3).
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| CN202110064162.1A CN112671014A (en) | 2021-01-18 | 2021-01-18 | Flywheel energy storage variable speed power generation system |
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| CN202110064162.1A CN112671014A (en) | 2021-01-18 | 2021-01-18 | Flywheel energy storage variable speed power generation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115720025A (en) * | 2022-11-18 | 2023-02-28 | 青岛元动芯能源科技有限公司 | Nuclear power supply and power supply system |
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| CN103280834A (en) * | 2013-05-13 | 2013-09-04 | 中国矿业大学 | Variable speed constant frequency and energy storage method and device for wind power generation |
| CN105140943A (en) * | 2014-06-09 | 2015-12-09 | 徐立民 | Wind power generation system having flywheel and one-pole dc magnetic driver |
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