CN113489031A - Large-inertia flywheel energy storage access system for grid-connected new energy station - Google Patents
Large-inertia flywheel energy storage access system for grid-connected new energy station Download PDFInfo
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- CN113489031A CN113489031A CN202110792092.1A CN202110792092A CN113489031A CN 113489031 A CN113489031 A CN 113489031A CN 202110792092 A CN202110792092 A CN 202110792092A CN 113489031 A CN113489031 A CN 113489031A
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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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Abstract
The invention relates to a large inertia flywheel energy storage access system for a grid-connected new energy station, which is connected with an alternating current power grid and comprises a grid-connected controller, a frequency converter, a flywheel motor, a flywheel rotor, a transmission, a motor and a boosting and grid-connected integrated cabinet; the frequency converter and the motor are connected to a boosting and grid-connection integrated cabinet, and the boosting and grid-connection integrated cabinet is arranged between the alternating current power grid and the new energy station; the flywheel rotor is connected with the frequency converter through a flywheel motor; and the grid-connected controller is electrically connected with the new energy station, the boosting and grid-connected integrated cabinet, the frequency converter and the transmission respectively. The large-inertia flywheel energy storage access system for the grid-connected new energy station adopts physical flywheel energy storage, has longer service life, better accords with the use plan of the new energy station, has no pollution to the environment during later recovery, can frequently carry out high-power charge and discharge within the rated power range and has no adverse effect on equipment compared with other technical schemes adopting electrochemical energy storage.
Description
Technical Field
The invention relates to the field of power grid adjusting equipment, in particular to a large-inertia flywheel energy storage access system for a grid-connected new energy station.
Background
At present, the problems of power generation power fluctuation and grid connection characteristic improvement of a new energy station are solved, generally, a distributed energy storage system is configured inside each power generation unit of the new energy station or on each power collection line in the new energy station, a centralized energy storage device can be incorporated into a grid connection point of the new energy station, the problem of overall output fluctuation of each power generation unit or new energy station in the new energy station due to external natural condition changes is solved by adjusting charging and discharging power of stored energy in real time, and the grid connection characteristic of the new energy station is improved.
With the higher and higher permeability of new energy power generation, the demand for configuring energy storage in a new energy station is more and more urgent, and most of the existing energy storage devices configured in the new energy station are electrochemical energy storage devices. The electrochemical energy storage charging and discharging must pass through a power electronic conversion device, and as the power electronic device is a nonlinear time-varying topological load, the harmonic pollution caused by the power electronic device is considered as a big public hazard of a power system, and after the installation proportion of new energy is improved in the future, the harmonic pollution problem faced by a power grid is more severe. Therefore, at present, a substitute for electrochemical energy storage needs to be found out, and the substitute is used for a mechanical energy storage access system of a new energy station, so as to solve the problems of stabilizing the output fluctuation of the new energy station and improving the grid-connected characteristic of the new energy station by completely depending on the electrochemical energy storage system.
Disclosure of Invention
Based on this, it is necessary to provide a high inertia flywheel energy storage access system for grid-connected new energy stations, aiming at least one of the problems mentioned above.
The invention provides a large inertia flywheel energy storage access system for a grid-connected new energy station, which is connected with an alternating current power grid and comprises a grid-connected controller, a frequency converter, a flywheel motor, a flywheel rotor, a transmission, a motor and a boosting and grid-connected integrated cabinet;
the frequency converter and the motor are both connected to the boosting and grid-connected integrated cabinet, and the boosting and grid-connected integrated cabinet is arranged between the alternating current power grid and the new energy station; the motor is connected with the flywheel rotor through the transmission, and the flywheel rotor is connected with the frequency converter through the flywheel motor;
and the grid-connected controller is electrically connected with the new energy station, the boosting and grid-connected integrated cabinet, the frequency converter and the transmission respectively.
In one embodiment, the motor is a dual-purpose motor for electric/electric power generation.
In one embodiment, a 35kV current collection line is arranged between the new energy station and the boost grid-connected integrated cabinet.
In one embodiment, a 35kV/110kV main transformer is arranged between the boosting grid-connected integrated cabinet and the alternating current power grid.
In one embodiment, the flywheel rotor is connected to the transmission via a main shaft.
The technical scheme provided by the embodiment of the invention has the following beneficial technical effects:
the large-inertia flywheel energy storage access system for the grid-connected new energy station adopts physical flywheel energy storage, has longer service life, better accords with the use plan of the new energy station, has no pollution to the environment during later recovery, can frequently carry out high-power charge and discharge within the rated power range and has no adverse effect on equipment per se compared with other technical schemes adopting electrochemical energy storage; the large-inertia flywheel driving motor rotating mechanically is adopted to directly input/output power to a power grid, and therefore grid-connected friendliness of the new energy station can be greatly improved.
Additional aspects and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural framework diagram of a large inertia flywheel energy storage access system for a grid-connected new energy station according to an embodiment of the present invention;
fig. 2 is a schematic operation flow diagram of a large-inertia flywheel energy storage access system for a grid-connected new energy station according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Possible embodiments of the invention are given in the figures. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein by the accompanying drawings. The embodiments described by way of reference to the drawings are illustrative for the purpose of providing a more thorough understanding of the present disclosure and are not to be construed as limiting the present invention. Furthermore, if a detailed description of known technologies is not necessary for illustrating the features of the present invention, such technical details may be omitted.
It will be understood by those skilled in the relevant art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It is to be understood that the term "and/or" as used herein is intended to include all or any and all combinations of one or more of the associated listed items.
The technical solution of the present invention and how to solve the above technical problems will be described in detail with specific examples.
The large inertia flywheel energy storage access system for the grid-connected new energy station, provided by the invention, is connected with an alternating current power grid, and comprises a grid-connected controller, a frequency converter, a flywheel motor, a flywheel rotor, a transmission, a motor and a boost grid-connected integrated cabinet as shown in fig. 1. The boost and grid-connected integrated cabinet is a cabinet body which mainly integrates functions of an incoming line cabinet, a metering cabinet, a PT cabinet, a boost transformer, an outgoing line cabinet and the like, and mainly plays a role in boosting and reducing voltage for connection of a flywheel system side; the new energy station mainly has electrical functions of grid connection terminals, detection and the like; the integrated cabinet also comprises a grid-connected protection device commonly used in the electrical field.
The frequency converter and the motor are connected to a boosting and grid-connection integrated cabinet, and the boosting and grid-connection integrated cabinet is arranged between the alternating current power grid and the new energy station; the motor is connected with the flywheel rotor through a speed changer, and the flywheel rotor is connected with the frequency converter through the flywheel motor. And the grid-connected controller is electrically connected with the new energy station, the boosting and grid-connected integrated cabinet, the frequency converter and the transmission respectively.
The networking controller includes a Processor, and from a hardware perspective, the Processor may be a CPU (Central Processing Unit), a general-purpose Processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a DSP and a microprocessor, or the like.
As shown in fig. 2, after the whole novel large inertia flywheel system is connected to the grid, the system has three working states of charging, maintaining and discharging.
For example, when the output power of the new energy station fluctuates, the grid-connected controller controls the flywheel system to rapidly input/output corresponding compensation power according to the fluctuation of the output power, so that the power fluctuation of a 35kV grid-connected point is stabilized, and the grid-connected friendly characteristic of the new energy station is improved.
When the frequency of the power grid changes, the grid-connected controller detects the frequency fluctuation of the grid-connected point in real time at a high frequency, and adjusts the input/output power of the novel large-inertia flywheel system in real time according to the deviation of the frequency of the power grid, so that the primary frequency modulation function of the new energy station is realized.
When the frequency of the power grid rises and is greater than 50.033Hz, the motor works in a motor state at the moment, the rotor of the motor drives the flywheel rotor to accelerate through the speed changer, the larger the frequency deviation is, the larger the moment of the motor rotor is, namely, the larger the input power of the novel large-inertia flywheel system is; in addition, the grid-connected controller controls the frequency converter to drive the flywheel motor to drive the flywheel rotor to accelerate according to the frequency change, the novel large-inertia flywheel system can rapidly absorb the energy of the power grid through two paths of power input, and the frequency of the power grid is restrained from further rising.
When the frequency of the power grid is reduced, the novel large-inertia flywheel system rapidly releases energy to the power grid to inhibit the frequency of the power grid from further reducing, the motor works in a power generation state at the moment, the flywheel rotor speed changer drives the generator rotor to rotate, the larger the frequency deviation is, the larger the moment of the flywheel rotor is, and the larger the output power of the novel large-inertia flywheel system is. In addition, the grid-connected controller controls the frequency converter to drive the flywheel motor to drive the flywheel rotor to decelerate according to the frequency change, and the novel large-inertia flywheel system can rapidly release energy through two paths of power output to restrain the power grid frequency from further falling.
When the frequency of the power grid is within the range of 50Hz +/-0.033, the grid-connected control controls the novel large-inertia flywheel system to absorb/release energy to the power grid by controlling the frequency converter-speed changer, the rotating speed of the flywheel rotor is rapidly recovered to a certain set rotating speed and then the standby state is maintained, and the novel large-inertia flywheel system is guaranteed to cope with the next power grid frequency fluctuation in the best state.
The frequency converter is electrically connected with the flywheel motor, ensures the bidirectional flow of the motor power, finishes gradually increasing the speed of the flywheel rotor from static to set rotating speed and realizes the initialization stage before the flywheel system is connected to the grid; the rotor of the flywheel motor is coaxially connected with the flywheel rotor, and the flywheel motor completes the acceleration and braking of the flywheel rotor.
The flywheel rotor is connected with a speed changer through a main shaft, and outputs a set rotating speed after passing through the speed changer. The speed changer is connected with the motor and ensures that the motor rotor keeps running at a set rotating speed. The motor is electrically connected with the boosting and grid-connected integrated cabinet, and the generator realizes electric energy interaction with a grid-connected point (an alternating current power grid and/or a new energy station) through the grid-connected integrated cabinet.
The large-inertia flywheel energy storage access system for the grid-connected new energy station adopts physical flywheel energy storage, has longer service life, better accords with the use plan of the new energy station, has no pollution to the environment during later recovery, can frequently carry out high-power charge and discharge within the rated power range and has no adverse effect on equipment per se compared with other technical schemes adopting electrochemical energy storage; the large-inertia flywheel driving motor rotating mechanically is adopted to directly input/output power to a power grid, and therefore grid-connected friendliness of the new energy station can be greatly improved.
Optionally, in an embodiment of the present application, the motor is a dual-purpose motor for electric/electric power generation.
Optionally, in another embodiment of the application of the present invention, a 35kV current collecting line is arranged between the new energy station and the boost grid-connected integrated cabinet.
Optionally, in a specific implementation manner of an embodiment of the present invention, a 35kV/110kV main transformer is disposed between the boost grid-connected integrated cabinet and the ac power grid.
Alternatively, in another specific implementation of an embodiment of the present application, the flywheel rotor is connected to the transmission through a main shaft. The flywheel rotor can be directly connected with the speed changer through the main shaft and can also be connected with the speed changer through other couplings so as to adapt to actual installation places.
The invention provides a large-inertia flywheel energy storage access system for a grid-connected new energy station, which is incorporated into a 35kV grid-connected side of the new energy station as shown in figure 1.
The grid-connected controller is connected with the new energy station, the boosting and grid-connected integrated cabinet, the frequency converter and the speed changer, can be electrically connected, establishes communication connection, and sends control signals to the frequency converter and the speed changer by receiving electric state information of a 35kV grid-connected side and power generation state information of the new energy station to complete grid-connected control of corresponding working conditions.
The invention ensures that the charging and discharging states of the novel large inertia flywheel system are rapidly adjusted through the grid-connected controller when the output of the new energy station fluctuates or the grid-connected characteristic changes, so that the output power of the new energy station is smooth, and the system is different from a power electronic conversion device, adopts a mechanically-rotated large inertia flywheel driving motor to directly input/output power to a power grid, and greatly improves the grid-connected convenience and adaptability of the new energy station.
Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (5)
1. A large inertia flywheel energy storage access system for a grid-connected new energy station is connected with an alternating current power grid and is characterized by comprising a grid-connected controller, a frequency converter, a flywheel motor, a flywheel rotor, a transmission, a motor and a boosting and grid-connected integrated cabinet;
the frequency converter and the motor are both connected to the boosting and grid-connected integrated cabinet, and the boosting and grid-connected integrated cabinet is arranged between the alternating current power grid and the new energy station; the motor is connected with the flywheel rotor through the transmission, and the flywheel rotor is connected with the frequency converter through the flywheel motor;
and the grid-connected controller is electrically connected with the new energy station, the boosting and grid-connected integrated cabinet, the frequency converter and the transmission respectively.
2. The high inertia flywheel energy storage access system for the grid-connected new energy station of claim 1, wherein the motor is a dual-purpose motor for electric/power generation.
3. The high-inertia flywheel energy storage access system for the grid-connected new energy station as claimed in claim 1, wherein a 35kV current collection line is arranged between the new energy station and the boost grid-connected integrated cabinet.
4. The large inertia flywheel energy storage access system for the grid-connected new energy station as claimed in claim 3, wherein a main transformer of 35kV/110kV is arranged between the boost grid-connected cabinet and the AC power grid.
5. The high inertia flywheel energy storage access system for the grid-connected new energy station of claim 1, wherein the flywheel rotor is connected with the transmission through a main shaft.
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Cited By (3)
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| CN113922391A (en) * | 2021-10-19 | 2022-01-11 | 吉林省电力科学研究院有限公司 | Control method for primary frequency modulation of flywheel energy storage auxiliary thermal power generating unit |
| CN114257031A (en) * | 2021-11-16 | 2022-03-29 | 国家电投集团科学技术研究院有限公司 | Flywheel energy storage system with asynchronous speed regulator |
| CN114744655A (en) * | 2022-04-01 | 2022-07-12 | 北京奇稳新能源科技有限公司 | Control method and topology device of flywheel energy storage system |
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