CN112510725A - Power grid frequency modulation inertia adjusting method and distributed flywheel energy storage system - Google Patents
Power grid frequency modulation inertia adjusting method and distributed flywheel energy storage system Download PDFInfo
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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
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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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 provides a method for adjusting frequency modulation inertia of a power grid and a distributed flywheel energy storage system, wherein the method is applied to the distributed flywheel energy storage system and comprises the following steps: the method comprises the steps that a dispatching system collects frequency deviation of a power grid and judges whether the frequency deviation is in a first preset frequency range or not; if so, controlling the distributed flywheel energy storage system to enter a single machine system operation mode so as to correspondingly control the flywheel energy storage unit and the fan by the flywheel energy storage controller; if not, the distributed flywheel energy storage system is controlled to enter a multi-machine system operation mode, and the dispatching system correspondingly controls the flywheel energy storage unit and the fan. According to the method for adjusting the frequency modulation inertia of the power grid, the flywheel energy storage unit and the fan are matched to work under different system operation modes, and the accuracy of adjustment is improved; and, the replacement of the electrochemical cell and the large-area deployment are avoided, thereby reducing the cost and improving the safety of the adjustment.
Description
Technical Field
The invention relates to the technical field of new energy storage, in particular to a method for adjusting frequency modulation inertia of a power grid and a distributed flywheel energy storage system.
Background
With the development of new energy technology, the deployment quantity of new energy projects is also on an increasing trend, and new energy projects such as photovoltaic, wind power and wind heat are increased rapidly. For a long time, the problems of wind abandonment, light abandonment, high volatility and the like are important factors which hinder the development of new energy technology.
In the related art, the adjustment of the frequency modulation inertia of the power grid is generally realized by a mode of adjusting the blade angle by a fan or a mode of storing energy by an electrochemical battery.
However, the blade angle needs to be adjusted by using the fan frequency modulation method, at least 2-3 seconds are needed, and as the service life of the fan increases, the bearing of the fan is worn, so that the deviation between the adjustment speed and the preset speed of the fan increases, and the accurate control of the system is not facilitated; the way of using electrochemical cells to store energy has a problem of charge and discharge rate, and the arrangement of electrochemical cells is usually 1C, and the maximum arrangement is 2C. In actual operation, the operation effect of the electrochemical cells is generally between 0.7 and 0.75C, and the maximum configuration is realized based on the increase of the number and the capacity of the electrochemical cells, so that the economical efficiency is poor. Meanwhile, the current electrochemical cell deployment time in a large area is short, the problems of replacement of the electrochemical cell and incapability of using the electrochemical cell at the same time can cause high cost of using the electrochemical cell, and fire problems can occur in the large-area deployment of the electrochemical cell, which results in low safety.
Disclosure of Invention
The invention aims to solve the technical problems of low adjustment accuracy, poor economy and low safety in a power grid frequency modulation inertia adjustment mode in the prior art.
Therefore, an object of the present invention is to provide a method for adjusting a frequency modulation inertia of a power grid, which is applied to a distributed flywheel energy storage system, and the method controls the distributed flywheel energy storage system to enter a corresponding system operation mode by determining a frequency range in which a frequency deviation of the power grid is located, so that a flywheel energy storage unit and a fan work in cooperation in different system operation modes, thereby achieving accurate adjustment of the frequency deviation, and avoiding the problems of replacement of an electrochemical battery, incapability of using the new and old electrochemical battery at the same time, and large-area deployment, thereby reducing cost and improving adjustment safety.
Therefore, the second objective of the present invention is to provide a distributed flywheel energy storage system.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for adjusting a frequency modulation inertia of a power grid, where the method is applied to a distributed flywheel energy storage system, where the distributed flywheel energy storage system includes a plurality of flywheel energy storage subsystems connected in parallel to the power grid, each flywheel energy storage subsystem includes a flywheel energy storage unit, a fan, and a flywheel energy storage controller for controlling the flywheel energy storage units and the fan, and the flywheel energy storage controllers are connected to a scheduling system, and the method includes: the dispatching system collects the frequency deviation of the power grid and judges whether the frequency deviation is in a first preset frequency range or not; if so, controlling the distributed flywheel energy storage system to enter a single machine system operation mode so as to correspondingly control the flywheel energy storage unit and the fan by the flywheel energy storage controller; if not, controlling the distributed flywheel energy storage system to enter a multi-machine system operation mode so that the dispatching system correspondingly controls the flywheel energy storage unit and the fan.
According to the method for adjusting the frequency modulation inertia of the power grid, whether the frequency deviation of the power grid is within a first preset frequency range or not is judged, the distributed flywheel energy storage system is controlled to enter a corresponding system operation mode based on the judgment result, and under the corresponding system operation mode, the flywheel energy storage controller or the scheduling system correspondingly controls the flywheel energy storage unit and the fan, so that the flywheel energy storage unit and the fan can be mutually matched to work under different system operation modes, the frequency deviation is accurately adjusted, the problem that the adjustment speed is larger than the preset speed due to the fact that the fan is only used for adjusting the frequency deviation is solved, and the adjustment accuracy is improved; and the problems of replacement of the electrochemical cell, incapability of using the new and old electrochemical cells simultaneously and large-area deployment are solved without using the electrochemical cell, so that the cost is reduced, and the safety of regulation is improved.
In some embodiments, after the controlling the distributed flywheel energy storage system to enter the stand-alone system operation mode, the controlling includes: judging whether the frequency deviation is in a second preset frequency range or not; if not, further judging whether the frequency deviation is less than 0; if the frequency deviation is less than 0, the flywheel energy storage controller controls the flywheel energy storage unit to discharge until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0; and if the frequency deviation is greater than 0, the flywheel energy storage controller controls the flywheel energy storage unit to charge until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0. By determining the frequency range of the frequency deviation, the flywheel energy storage controller correspondingly controls the work of the flywheel energy storage unit and the fan, so that the control accuracy is improved.
In some embodiments, after controlling the flywheel energy storage unit to charge or discharge, the method further includes: judging whether the working time corresponding to the residual energy of the flywheel energy storage unit is greater than a first preset time or not; if not, controlling the fan to act to adjust the frequency deviation until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0.
In some embodiments, the controlling the distributed flywheel energy storage system to enter a multi-machine system operation mode includes: and the dispatching system controls the fan to be switched in after delaying for a second preset time, and simultaneously controls the flywheel energy storage unit to be charged or discharged until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0.
In some embodiments, after the scheduling system controls the flywheel energy storage unit to charge or discharge, the method further includes: and if the charging or discharging time of the flywheel energy storage unit is greater than or equal to a third preset time, controlling the flywheel energy storage unit to stop charging or discharging.
In order to achieve the above object, a second embodiment of the present invention provides a distributed flywheel energy storage system, which includes: the system comprises a dispatching system and a plurality of flywheel energy storage subsystems connected to a power grid in parallel, wherein each flywheel energy storage subsystem comprises a flywheel energy storage unit, a fan and a flywheel energy storage controller used for controlling the flywheel energy storage unit and the fan, and the flywheel energy storage controllers are connected with the dispatching system; if so, controlling the distributed flywheel energy storage system to enter a single machine system operation mode so as to correspondingly control the flywheel energy storage unit and the fan by the flywheel energy storage controller; if not, controlling the distributed flywheel energy storage system to enter a multi-machine system operation mode so that the dispatching system correspondingly controls the flywheel energy storage unit and the fan.
According to the distributed flywheel energy storage system provided by the embodiment of the invention, whether the frequency deviation of a power grid is in a first preset frequency range or not is judged, the distributed flywheel energy storage system is controlled to enter a corresponding system operation mode based on the judgment result, and under the corresponding system operation mode, the flywheel energy storage controller or the scheduling system correspondingly controls the flywheel energy storage unit and the fan, so that the flywheel energy storage unit and the fan can be mutually matched to work under different system operation modes, thereby realizing accurate regulation of the frequency deviation, avoiding the problem that the regulation speed is greatly deviated from the preset speed due to the fact that the fan is only used for regulating the frequency deviation, and further improving the regulation accuracy; and the problems of replacement of the electrochemical cell, incapability of using the new and old electrochemical cells simultaneously and large-area deployment are solved without using the electrochemical cell, so that the cost is reduced, and the safety of regulation is improved.
In some embodiments, after the distributed flywheel energy storage system enters the stand-alone system operation mode, the flywheel energy storage controller is specifically configured to: judging whether the frequency deviation is in a second preset frequency range or not; if not, further judging whether the frequency deviation is less than 0; if the frequency deviation is less than 0, the flywheel energy storage controller controls the flywheel energy storage unit to discharge until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0; and if the frequency deviation is greater than 0, the flywheel energy storage controller controls the flywheel energy storage unit to charge until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0.
In some embodiments, after controlling the flywheel energy storage unit to charge or discharge, the flywheel energy storage controller is further configured to: judging whether the working time corresponding to the residual energy of the flywheel energy storage unit is greater than a first preset time or not; if not, controlling the fan to act to adjust the frequency deviation until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0.
In some embodiments, after the distributed flywheel energy storage system enters the multi-machine system operation mode, the scheduling system is specifically configured to: and controlling the fan to be switched in after delaying for a second preset time, and simultaneously controlling the flywheel energy storage unit to charge or discharge until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0.
In some embodiments, after controlling the flywheel energy storage unit to charge or discharge, the scheduling system is further configured to: and when the charging or discharging time of the flywheel energy storage unit is greater than or equal to a third preset time, controlling the flywheel energy storage unit to stop charging or discharging.
Additional aspects and advantages of the invention 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 invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flow chart of a method for adjusting the frequency-modulated inertia of a power grid according to an embodiment of the invention;
fig. 2 is a flow chart of a method for adjusting the frequency-modulated inertia of a power grid according to an embodiment of the invention;
fig. 3 is a flow chart of a method for adjusting the frequency-modulated inertia of a power grid according to another embodiment of the invention;
FIG. 4 is a block diagram of a distributed flywheel energy storage system according to one embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
The following describes a method for adjusting the frequency-modulated inertia of a power grid according to an embodiment of the present invention with reference to fig. 1 to 3. The method for adjusting the frequency modulation inertia of the power grid is applied to a distributed flywheel energy storage system. The distributed flywheel energy storage system comprises a plurality of flywheel energy storage subsystems connected to a power grid in parallel, each flywheel energy storage subsystem comprises a flywheel energy storage unit, a fan and a flywheel energy storage controller used for controlling the flywheel energy storage units and the fan, and the flywheel energy storage controllers are connected with the scheduling system. Each fan, the flywheel energy storage units and the flywheel energy storage controllers are arranged in a distributed mode, so that distributed adjustment of the fans and the flywheel energy storage units is achieved, control delay is reduced, harmonic waves on a transmission line are reduced, and accuracy of control of the distributed flywheel energy storage system is improved.
As shown in fig. 1, the method for adjusting the frequency-modulated inertia of the power grid according to the embodiment of the present invention at least includes step S1, step S2, and step S3.
Step S1, the dispatching system collects the frequency deviation of the power grid and judges whether the frequency deviation is in a first preset frequency range.
In an embodiment, signals, such as voltage or current signals, may be collected between a primary and a secondary of the power grid, the voltage or current signals may be filtered to obtain voltage or current signals with no or less interference, and the filtered voltage or current signals may be subjected to frequency analysis to obtain a frequency deviation of the power grid, so as to predict a frequency change direction of the power grid.
Specifically, the frequency deviation of the power grid can be understood as the frequency fluctuation of the power grid, and if the frequency deviation is large, the frequency fluctuation of the power grid is considered to be large; and if the frequency deviation is small, the frequency fluctuation of the power grid is considered to be small. The first preset frequency range is a frequency range corresponding to a large frequency deviation of the power grid, for example, the first preset frequency range is 1% -20%, and if the acquired frequency deviation exceeds the first preset frequency range, for example, the frequency deviation is 21%, 24%, 26%, and the like, the frequency fluctuation of the power grid is considered to be large, so that the frequency fluctuation condition of the power grid can be determined by judging whether the frequency deviation is in the first preset frequency range, and thus, the distributed flywheel energy storage system is controlled correspondingly according to different frequency deviations.
And step S2, if yes, controlling the distributed flywheel energy storage system to enter a single machine system operation mode, so that the flywheel energy storage controller correspondingly controls the flywheel energy storage unit and the fan.
In an embodiment, when it is determined that the frequency deviation is within a first preset frequency range, for example, the frequency deviation is 10%, 12%, or 14%, it is considered that the frequency fluctuation of the power grid is relatively small, at this time, the distributed flywheel energy storage system is controlled to enter a single-machine system operation mode, the single-machine system operation mode is suitable for a case where the frequency deviation is relatively small, the single-machine system operation mode is mainly to control the flywheel energy storage units and the fans through the flywheel energy storage controllers, and it can be understood that each flywheel energy storage controller can control the corresponding flywheel energy storage unit to charge or discharge, and control the fans to adjust the blade angles, thereby implementing accurate adjustment of the frequency deviation. In the stand-alone system mode of operation, the dispatch system only monitors the frequency deviation, but does not adjust.
In a single-machine system operation mode, when the frequency deviation is relatively small, if the flywheel energy storage controller controls the flywheel energy storage unit corresponding to the flywheel energy storage controller to charge or discharge, and after the flywheel energy storage unit is charged or discharged, it is determined that the frequency deviation cannot be adjusted to a required frequency range only through the charging or discharging of the flywheel energy storage unit, the fan needs to be further controlled to adjust the blade angle to continue adjusting the frequency deviation until the frequency deviation is adjusted to the required frequency range.
If the flywheel energy storage controller controls the corresponding flywheel energy storage unit to charge or discharge, and after the flywheel energy storage unit is charged or discharged, the frequency deviation can be adjusted to the required frequency range only by charging or discharging the flywheel energy storage unit, and the fan does not need to be further controlled to adjust the frequency deviation. Through controlling the flywheel energy storage unit and the fan to work in a matched mode, the frequency deviation can be accurately adjusted, and the problems that when the frequency deviation is adjusted by only adjusting the blade angle through the fan, due to the fact that a fan bearing is abraded, adjusting errors are large and accuracy is low can be solved.
And step S3, if not, controlling the distributed flywheel energy storage system to enter a multi-machine system operation mode, so that the dispatching system correspondingly controls the flywheel energy storage unit and the fan.
In the embodiment, if it is determined that the frequency deviation is not within the first preset frequency range, for example, the frequency deviation is 21%, 24%, 26%, and the like, it is determined that the frequency fluctuation of the power grid is large, at this time, the distributed flywheel energy storage system is controlled to enter a multi-machine system operation mode, the multi-machine system operation mode is suitable for the case where the frequency deviation is large, and in the multi-machine system operation mode, the flywheel energy storage unit and the fan are directly controlled by the scheduling system at the same time.
Specifically, when the frequency deviation is large, the frequency fluctuation of the power grid is considered to be severe, in order to quickly stabilize the frequency of the power grid, after the distributed flywheel energy storage system enters a multi-machine system operation mode, the dispatching system controls the flywheel energy storage unit to charge or discharge, and meanwhile, the fan is controlled to adjust the blade angle to adjust the frequency of the power grid, so that the frequency of the power grid can be quickly stabilized, and the frequency deviation can be quickly and accurately adjusted.
According to the method for adjusting the frequency modulation inertia of the power grid, whether the frequency deviation of the power grid is within a first preset frequency range or not is judged, the distributed flywheel energy storage system is controlled to enter a corresponding system operation mode based on the judgment result, and under the corresponding system operation mode, the flywheel energy storage controller or the scheduling system correspondingly controls the flywheel energy storage unit and the fan, so that the flywheel energy storage unit and the fan can be mutually matched to work under different system operation modes, the frequency deviation is accurately adjusted, the problem that the adjustment speed is larger than the preset speed due to the fact that the fan is only used for adjusting the frequency deviation is solved, and the adjustment accuracy is improved; and the problems of replacement of the electrochemical cell, incapability of using the new and old electrochemical cells simultaneously and large-area deployment are solved without using the electrochemical cell, so that the cost is reduced, and the safety of regulation is improved.
In some embodiments, after the distributed flywheel energy storage system is controlled to enter the stand-alone system operation mode, the method includes: judging whether the frequency deviation is in a second preset frequency range or not; if not, further judging whether the frequency deviation is less than 0; if the frequency deviation is less than 0, the flywheel energy storage controller controls the flywheel energy storage unit to discharge until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0; and if the frequency deviation is greater than 0, the flywheel energy storage controller controls the flywheel energy storage unit to charge until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0. It can be understood that the second preset frequency range is a frequency range corresponding to a relatively small frequency deviation of the power grid, and if the frequency deviation is within the second preset frequency range, the power grid frequency fluctuation is considered to be small, and the frequency deviation does not need to be adjusted. If the frequency deviation is within the first preset frequency range but not within the second preset frequency range, for example, the frequency deviation is 11%, 12%, 14%, and the like, it is determined that the frequency of the power grid fluctuates to a certain extent, and at this time, the frequency deviation needs to be adjusted, and the frequency change direction is further determined, so as to determine the working mode of the distributed flywheel energy storage system, such as charging or discharging. Specifically, the charging or discharging of the flywheel energy storage unit can be determined and controlled by judging the magnitude relation between the frequency deviation and 0. If the frequency deviation is within a second preset frequency range, for example, the frequency deviation is 2%, 3%, 4%, etc., it can be considered that the frequency of the power grid is not fluctuated or within a range of allowable fluctuation, and at this time, it is considered that the frequency of the power grid is normal, and it is not necessary to perform adjustment, and it is not necessary to control the operation of the flywheel energy storage unit. Therefore, the frequency range where the frequency deviation is located is determined, the work of the flywheel energy storage unit and the fan is correspondingly controlled, and the control accuracy is improved.
In some embodiments, after the flywheel energy storage controller controls the flywheel energy storage unit to discharge or charge, the method further includes: the flywheel energy storage controller judges whether the working time corresponding to the residual energy of the flywheel energy storage unit is greater than a first preset time or not; if not, controlling the fan to act to adjust the frequency deviation until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0. It can be understood that when the flywheel energy storage unit is controlled to charge or discharge, the working time corresponding to the residual energy of the flywheel energy storage unit is judged to judge whether the flywheel energy storage unit can meet the frequency modulation requirement. If the working time corresponding to the residual energy is longer than the first preset time, the frequency deviation can be adjusted to the required frequency range only by controlling the charging or discharging of the flywheel energy storage unit; if the working time corresponding to the residual energy is less than or equal to the first preset time, the frequency deviation cannot be adjusted to the required frequency range only by controlling the charging or discharging of the flywheel energy storage unit, at the moment, the action of the fan is also required to be controlled to match the adjustment of the frequency deviation until the frequency deviation is adjusted to 0, the variation of the frequency deviation in unit time is 0, at the moment, the frequency of the power grid is considered to be stable, the adjustment is not required to be continued, and the flywheel energy storage unit and the fan are controlled to stop working.
For example, taking the working time of the flywheel energy storage unit as 15 seconds as an example, after the flywheel energy storage unit is controlled to be charged or discharged, the working time of the flywheel energy storage unit is gradually reduced to 13 seconds, for example, the time for adjusting the propeller of the fan needs 2 to 3 seconds, so that the first preset time may be 10 to 11 seconds, at this time, it needs to be determined whether the working time corresponding to the residual energy of the flywheel energy storage unit is greater than 10 to 11 seconds, and if so, it is determined that the working time corresponding to the residual energy of the flywheel energy storage unit can adjust the frequency deviation to the required frequency range; if not, the working time corresponding to the residual energy of the flywheel energy storage unit is considered to be incapable of adjusting the frequency deviation to the required frequency range. By judging the working time corresponding to the residual energy of the flywheel energy storage unit, the flywheel energy storage unit and the fan are controlled to work in a matched mode, and the accuracy and the reliability of control are improved.
The method for adjusting the frequency-modulated inertia of the power grid according to the embodiment of the present invention is described in detail with reference to fig. 2, and as shown in fig. 2, is a flowchart of the method for adjusting the frequency-modulated inertia of the power grid according to the embodiment of the present invention.
Step S11, start.
And step S12, the dispatching system collects the frequency deviation of the power grid.
Step S13, determining whether the frequency deviation is within a second predetermined frequency range, if not, performing step S14; if yes, go to step S18.
Step S14, determining whether the frequency deviation is less than 0, if yes, executing step S15; if not, go to step S20.
And step S15, the flywheel energy storage controller controls the flywheel energy storage unit to discharge.
Step S16, judging whether the working time corresponding to the residual energy of the flywheel energy storage unit is greater than a first preset time, if so, executing step S17; if not, go to step S21.
Step S17, determining whether the frequency offset is 0 and whether the variation of the frequency offset per unit time is 0, if yes, performing step S18; if not, go to step S14.
In step S18, the flywheel energy storage unit stops charging or discharging.
And step S19, the flywheel energy storage unit enters a floating charge standby state.
And step S20, the flywheel energy storage controller controls the flywheel energy storage unit to charge.
And step S21, controlling the fan to act to adjust the frequency deviation.
In some embodiments, after the distributed flywheel energy storage system is controlled to enter the multi-machine system operation mode, the method includes: and the dispatching system controls the fan to be switched in after delaying for a second preset time, and simultaneously controls the flywheel energy storage unit to charge or discharge until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0. It can be understood that, in the multi-machine system operation mode, because the frequency fluctuation of the power grid is large, in order to quickly adjust the frequency deviation, the scheduling system needs to send an instruction to control the fan to delay for a second preset time, for example, 2 to 3 seconds, at this time, the adjustment of the blade angle of the fan is completed, the frequency deviation is adjusted by controlling the fan to move, and meanwhile, the flywheel energy storage unit is controlled to charge or discharge, the frequency deviation is adjusted, that is, the fan and the flywheel energy storage unit work together, so that the quick and accurate adjustment of the frequency deviation is realized.
In some embodiments, after the scheduling system controls the flywheel energy storage unit to charge or discharge, the scheduling system further controls the flywheel energy storage unit to stop charging or discharging if the charging or discharging time of the flywheel energy storage unit is greater than or equal to a third preset time. Specifically, the third preset time is determined by the frequency of the power grid, when the frequency of the power grid is high, the third preset time is long, when the frequency of the power grid is low, the third preset time is short, and after the flywheel energy storage unit is charged or discharged and the time reaches the third preset time, the flywheel energy storage unit is controlled to stop charging or discharging.
The method for adjusting the frequency-modulated inertia of the power grid according to the embodiment of the present invention is described in detail with reference to fig. 3, and as shown in fig. 3, is a flowchart of the method for adjusting the frequency-modulated inertia of the power grid according to the embodiment of the present invention.
Step S21, start.
And step S22, the dispatching system collects the frequency deviation of the power grid.
Step S23, determining whether the frequency deviation is within a first predetermined frequency range, if yes, performing step S29; if not, go to step S24.
And step S24, controlling the distributed flywheel energy storage system to enter a multi-machine system operation mode so that the dispatching system can correspondingly control the flywheel energy storage unit and the fan.
And step S25, the scheduling system controls the fan to be switched in after delaying for a second preset time, and simultaneously controls the flywheel energy storage unit to charge or discharge.
Step S26, determining whether the frequency offset is 0 and whether the variation of the frequency offset per unit time is 0, if yes, performing step S27; if not, go to step S23.
In step S27, the flywheel energy storage unit stops charging or discharging.
And step S28, the flywheel energy storage unit enters a floating charge standby state.
And step S29, controlling the distributed flywheel energy storage system to enter a single machine system operation mode so that the flywheel energy storage controller correspondingly controls the flywheel energy storage unit and the fan.
And step S30, the charging or discharging time of the flywheel energy storage unit is greater than or equal to a third preset time, and step S27 is executed.
According to the method for adjusting the frequency modulation inertia of the power grid, whether the frequency deviation of the power grid is within a first preset frequency range or not is judged, the distributed flywheel energy storage system is controlled to enter a corresponding system operation mode based on the judgment result, and under the corresponding system operation mode, the flywheel energy storage controller or the scheduling system correspondingly controls the flywheel energy storage unit and the fan, so that the flywheel energy storage unit and the fan can be mutually matched to work under different system operation modes, the frequency deviation is accurately adjusted, the problem that the adjustment speed is larger than the preset speed due to the fact that the fan is only used for adjusting the frequency deviation is solved, and the adjustment accuracy is improved; and the problems of replacement of the electrochemical cell, incapability of using the new and old electrochemical cells simultaneously and large-area deployment are solved without using the electrochemical cell, so that the cost is reduced, and the safety of regulation is improved.
A distributed flywheel energy storage system of an embodiment of the invention is described below.
As shown in fig. 4, a distributed flywheel energy storage system 1 according to an embodiment of the present invention includes a scheduling system 10 and a plurality of flywheel energy storage subsystems 11 connected in parallel to a power grid, where each flywheel energy storage subsystem 11 includes a flywheel energy storage unit 12, a fan 13, and a flywheel energy storage controller 14 for controlling the flywheel energy storage unit 12 and the fan 13, and the flywheel energy storage controllers 14 are connected to the scheduling system 10, where the scheduling system 10 is configured to collect a frequency deviation of the power grid and determine whether the frequency deviation is within a first preset frequency range; if yes, the distributed flywheel energy storage system 1 is controlled to enter a single-machine system operation mode, and the flywheel energy storage controller 14 correspondingly controls the flywheel energy storage unit 12 and the fan 13; if not, the distributed flywheel energy storage system 1 is controlled to enter a multi-machine system operation mode, so that the dispatching system 10 correspondingly controls the flywheel energy storage unit 12 and the fan 13. Specifically, the flywheel energy storage unit 12 is controlled by a corresponding flywheel controller, the fan 13 is controlled by a corresponding fan controller, the flywheel controller and the fan controller are both communicated with the flywheel energy storage controller 14 and controlled by the flywheel energy storage controller 14, the flywheel energy storage controllers 14 are communicated with each other to form closed-loop communication and are in communication connection with the dispatching system 10, when the frequency of a power grid is regulated, the response time of the distributed flywheel energy storage system 1 is shortened, bearing abrasion caused by the fact that the fan 13 sharply regulates blades is reduced, and the regulation accuracy is improved.
According to the distributed flywheel energy storage system 1 provided by the embodiment of the invention, whether the frequency deviation of a power grid is in a first preset frequency range or not is judged, the distributed flywheel energy storage system 1 is controlled to enter a corresponding system operation mode based on the judgment result, and under the corresponding system operation mode, the flywheel energy storage controller 14 or the scheduling system 10 correspondingly controls the flywheel energy storage unit 12 and the fan 13, so that the flywheel energy storage unit 12 and the fan 13 can mutually cooperate to work under different system operation modes, thereby realizing accurate regulation of the frequency deviation, and avoiding the problem that the deviation of the regulation speed and the preset speed is large because only the fan 13 is used for regulating the frequency deviation, and further improving the regulation accuracy; and the problems of replacement of the electrochemical cell, incapability of using the new and old electrochemical cells simultaneously and large-area deployment are solved without using the electrochemical cell, so that the cost is reduced, and the safety of regulation is improved.
In some embodiments, after the distributed flywheel energy storage system 1 enters the single-machine system operation mode, the flywheel energy storage controller 14 is specifically configured to determine whether the frequency deviation is within a second preset frequency range; if not, further judging whether the frequency deviation is less than 0; if the frequency deviation is less than 0, the flywheel energy storage controller 14 controls the flywheel energy storage unit 12 to discharge until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0; if the frequency deviation is greater than 0, the flywheel energy storage controller 14 controls the flywheel energy storage unit 12 to charge until the frequency deviation is 0 and the variation of the frequency deviation per unit time is 0. It can be understood that the second preset frequency range is a frequency range corresponding to a relatively small frequency deviation of the power grid, and if the frequency deviation is within the second preset frequency range, the power grid frequency fluctuation is considered to be small, and the frequency deviation does not need to be adjusted. If the frequency deviation is within the first preset frequency range but not within the second preset frequency range, for example, the frequency deviation is 11%, 12%, 14%, and the like, it is determined that the frequency of the power grid fluctuates to a certain extent, and at this time, the frequency deviation needs to be adjusted, and the frequency change direction is further determined, so as to determine the operating mode of the distributed flywheel energy storage system 1, such as charging or discharging. Specifically, whether to control charging or discharging of the flywheel energy storage unit 12 may be determined by determining the magnitude of the frequency deviation in relation to 0. If the frequency deviation is within a second preset frequency range, for example, the frequency deviation is 2%, 3%, 4%, etc., it may be determined that the frequency of the power grid is not fluctuated or within a range allowing the fluctuation, and at this time, it is determined that the frequency of the power grid is normal, and it is not necessary to perform adjustment, and it is not necessary to control the operation of the flywheel energy storage unit 12. Therefore, the frequency range in which the frequency deviation is located is determined, the work of the flywheel energy storage unit 12 and the fan 13 is correspondingly controlled, and the control accuracy is improved.
In some embodiments, after controlling the flywheel energy storage unit 12 to discharge or charge, the flywheel energy storage controller 14 is further configured to determine whether the working time corresponding to the remaining energy of the flywheel energy storage unit 12 is greater than a first preset time; if not, the fan 13 is controlled to operate to adjust the frequency deviation until the frequency deviation is 0 and the variation of the frequency deviation per unit time is 0. It can be understood that, when the flywheel energy storage unit 12 is controlled to be charged or discharged, the working time corresponding to the remaining energy of the flywheel energy storage unit 12 is determined to determine whether the flywheel energy storage unit 12 can meet the frequency modulation requirement. If the working time corresponding to the residual energy is longer than the first preset time, it is considered that the frequency deviation can be adjusted to the required preset frequency range only by controlling the charging or discharging of the flywheel energy storage unit 12; if the working time corresponding to the residual energy is less than or equal to the first preset time, it is considered that the frequency deviation cannot be adjusted to the required frequency range only by controlling the charging or discharging of the flywheel energy storage unit 12, at this time, the fan 13 needs to be controlled to act to adjust the frequency deviation in a matching manner until the frequency deviation is adjusted to 0, and the variation of the frequency deviation in unit time is 0, at this time, it is considered that the frequency of the power grid is stable, and the flywheel energy storage unit 12 and the fan 13 are controlled to stop working without continuously adjusting.
For example, taking the working time of the flywheel energy storage unit 12 as 15 seconds as an example, after the flywheel energy storage unit 12 is controlled to be charged or discharged, the working time of the flywheel energy storage unit 12 is gradually reduced to 13 seconds, for example, the blade adjusting time of the fan 13 needs 2 to 3 seconds, so that the first preset time may be 10 to 11 seconds, at this time, it is required to judge whether the working time corresponding to the residual energy of the flywheel energy storage unit 12 is greater than 10 to 11 seconds, and if so, it is considered that the working time corresponding to the residual energy of the flywheel energy storage unit 12 can adjust the frequency deviation to the required frequency range; if not, the working time corresponding to the residual energy of the flywheel energy storage unit 12 is determined to be unable to adjust the frequency deviation to the required frequency range. By judging the working time corresponding to the residual energy of the flywheel energy storage unit 12, the flywheel energy storage unit 12 and the fan 13 are controlled to work in a matched mode, and the accuracy and the reliability of control are improved.
In some embodiments, after the distributed flywheel energy storage system 1 enters the multi-machine system operation mode, the scheduling system 10 is specifically configured to control the fan 13 to access after delaying for a second preset time, and simultaneously control the flywheel energy storage unit 12 to charge or discharge until the frequency deviation is equal to 0, and the variation of the frequency deviation in unit time is 0. It can be understood that, in the multi-machine system operation mode, since the frequency fluctuation of the power grid is large, in order to quickly adjust the frequency deviation, the scheduling system 10 needs to send an instruction to control the fan 13 to delay for a second preset time, for example, 2 to 3 seconds, at this time, the blade angle adjustment of the fan 13 is completed, the frequency deviation is adjusted by controlling the fan 13 to act, and at the same time, the flywheel energy storage unit 12 is controlled to charge or discharge to adjust the frequency deviation, that is, the fan 13 and the flywheel energy storage unit 12 are controlled to work together, so that the quick and accurate adjustment of the frequency deviation is realized.
In some embodiments, after controlling the flywheel energy storage unit 12 to charge or discharge, the scheduling system 10 is further configured to control the flywheel energy storage unit 12 to stop charging or discharging when the charging or discharging time of the flywheel energy storage unit 12 is greater than or equal to a third preset time. The third preset time is determined by the frequency of the power grid, when the frequency of the power grid is higher, the third preset time is longer, when the frequency of the power grid is lower, the third preset time is shorter, and after the flywheel energy storage unit 12 is charged or discharged and the time reaches the third preset time, the flywheel energy storage unit 12 is controlled to stop charging or discharging.
In some embodiments, the super capacitor and the superconducting energy storage may also implement frequency adjustment of the power grid, but both have certain limitations, are not easy to deploy, and have high cost.
According to the distributed flywheel energy storage system 1 provided by the embodiment of the invention, whether the frequency deviation of a power grid is in a first preset frequency range or not is judged, the distributed flywheel energy storage system 1 is controlled to enter a corresponding system operation mode based on the judgment result, and under the corresponding system operation mode, the flywheel energy storage controller 14 or the scheduling system 10 correspondingly controls the flywheel energy storage unit 12 and the fan 13, so that the flywheel energy storage unit 12 and the fan 13 can mutually cooperate to work under different system operation modes, thereby realizing accurate regulation of the frequency deviation, and avoiding the problem that the deviation of the regulation speed and the preset speed is large because only the fan 13 is used for regulating the frequency deviation, and further improving the regulation accuracy; and the problems of replacement of the electrochemical cell, incapability of using the new and old electrochemical cells simultaneously and large-area deployment are solved without using the electrochemical cell, so that the cost is reduced, and the safety of regulation is improved.
In addition, other configurations and functions of the distributed flywheel energy storage system according to the above embodiment of the present invention are known to those skilled in the art, and are not described herein in detail to reduce redundancy.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The method for adjusting the frequency modulation inertia of the power grid is applied to a distributed flywheel energy storage system, the distributed flywheel energy storage system comprises a plurality of flywheel energy storage subsystems connected to the power grid in parallel, each flywheel energy storage subsystem comprises a flywheel energy storage unit, a fan and a flywheel energy storage controller used for controlling the flywheel energy storage unit and the fan, the flywheel energy storage controllers are connected with a scheduling system, and the method comprises the following steps:
the dispatching system collects the frequency deviation of the power grid and judges whether the frequency deviation is in a first preset frequency range or not;
if so, controlling the distributed flywheel energy storage system to enter a single machine system operation mode so as to correspondingly control the flywheel energy storage unit and the fan by the flywheel energy storage controller;
if not, controlling the distributed flywheel energy storage system to enter a multi-machine system operation mode so that the dispatching system correspondingly controls the flywheel energy storage unit and the fan.
2. The method for adjusting grid frequency-modulated inertia according to claim 1, wherein the controlling the distributed flywheel energy storage system to enter a stand-alone system operation mode comprises:
judging whether the frequency deviation is in a second preset frequency range or not;
if not, further judging whether the frequency deviation is less than 0;
if the frequency deviation is less than 0, the flywheel energy storage controller controls the flywheel energy storage unit to discharge until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0;
and if the frequency deviation is greater than 0, the flywheel energy storage controller controls the flywheel energy storage unit to charge until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0.
3. The method for adjusting the frequency-modulated inertia of the power grid as claimed in claim 2, further comprising, after controlling the flywheel energy storage unit to charge or discharge:
judging whether the working time corresponding to the residual energy of the flywheel energy storage unit is greater than a first preset time or not;
if not, controlling the fan to act to adjust the frequency deviation until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0.
4. The method for adjusting frequency-modulated inertia of a power grid according to claim 1, wherein the controlling the distributed flywheel energy storage system to enter a multi-machine system operation mode comprises:
and the dispatching system controls the fan to be switched in after delaying for a second preset time, and simultaneously controls the flywheel energy storage unit to be charged or discharged until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0.
5. The method for adjusting frequency-modulated inertia of power grid according to claim 4, further comprising, after the dispatching system controls the flywheel energy storage unit to charge or discharge:
and if the charging or discharging time of the flywheel energy storage unit is greater than or equal to a third preset time, controlling the flywheel energy storage unit to stop charging or discharging.
6. A distributed flywheel energy storage system, comprising: the system comprises a dispatching system and a plurality of flywheel energy storage subsystems connected to a power grid in parallel, wherein each flywheel energy storage subsystem comprises a flywheel energy storage unit, a fan and a flywheel energy storage controller used for controlling the flywheel energy storage unit and the fan, the flywheel energy storage controllers are connected with the dispatching system, the dispatching system is connected with the flywheel energy storage controllers,
the dispatching system is used for collecting the frequency deviation of the power grid and judging whether the frequency deviation is in a first preset frequency range;
if so, controlling the distributed flywheel energy storage system to enter a single machine system operation mode so as to correspondingly control the flywheel energy storage unit and the fan by the flywheel energy storage controller;
if not, controlling the distributed flywheel energy storage system to enter a multi-machine system operation mode so that the dispatching system correspondingly controls the flywheel energy storage unit and the fan.
7. The distributed flywheel energy storage system of claim 6 wherein, after the distributed flywheel energy storage system enters a stand-alone system operating mode, the flywheel energy storage controller is specifically configured to:
judging whether the frequency deviation is in a second preset frequency range or not;
if not, further judging whether the frequency deviation is less than 0;
if the frequency deviation is less than 0, the flywheel energy storage controller controls the flywheel energy storage unit to discharge until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0;
and if the frequency deviation is greater than 0, the flywheel energy storage controller controls the flywheel energy storage unit to charge until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0.
8. The distributed flywheel energy storage system of claim 7, wherein after controlling the flywheel energy storage units to discharge or charge, the flywheel energy storage controller is further configured to:
judging whether the working time corresponding to the residual energy of the flywheel energy storage unit is greater than a first preset time or not;
if not, controlling the fan to act to adjust the frequency deviation until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0.
9. The distributed flywheel energy storage system of claim 6, wherein after the distributed flywheel energy storage system enters a multi-machine system operating mode, the scheduling system is specifically configured to:
and controlling the fan to be switched in after delaying for a second preset time, and simultaneously controlling the flywheel energy storage unit to charge or discharge until the frequency deviation is 0 and the variation of the frequency deviation in unit time is 0.
10. The distributed flywheel energy storage system of claim 9, wherein after controlling the flywheel energy storage units to charge or discharge, the scheduling system is further configured to:
and when the charging or discharging time of the flywheel energy storage unit is greater than or equal to a third preset time, controlling the flywheel energy storage unit to stop charging or discharging.
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