CN113471956B - Charging and discharging power distribution method of energy storage flywheel array - Google Patents
Charging and discharging power distribution method of energy storage flywheel array Download PDFInfo
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- CN113471956B CN113471956B CN202110750755.3A CN202110750755A CN113471956B CN 113471956 B CN113471956 B CN 113471956B CN 202110750755 A CN202110750755 A CN 202110750755A CN 113471956 B CN113471956 B CN 113471956B
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
- H02J1/16—Balancing the load in a network using dynamo-electric machines coupled to flywheels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
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- 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
Abstract
The invention discloses a charging and discharging power distribution method of an energy storage flywheel array, which is characterized in that a total power instruction is distributed according to a total power instruction value and an optimized equal-duration power distribution algorithm, and a single distributed power instruction value is issued to each corresponding flywheel, so that the energy storage flywheel array can operate safely and reliably. Compared with the existing equal-time length algorithm, the charging and discharging power distribution method is simpler and more effective, and can operate on a low-performance platform.
Description
Technical Field
The invention belongs to the technical field of flywheel energy storage, and particularly relates to a charging and discharging power distribution method of an energy storage flywheel array.
Background
The flywheel energy storage principle is that the electric energy of the power grid is stored in a flywheel rotor rotating at a high speed in a mechanical energy mode, when the rotor reaches a rated rotating speed, the speed is not increased continuously, because the rotor bearing adopts a high-speed bearing with low loss and the sleeve is in a vacuum environment, the mechanical loss of the high-speed rotor is very low, the rated rotating speed can be maintained only by very small power, and the system is in an energy holding state; the rotor maintains rotation until a signal to release energy is received, converting the mechanical energy stored in the flywheel rotor into electrical energy. The energy stored by a single flywheel can use a rigid body to rotate around a fixed shaft
To express, it can be seen from the formula that the desire to obtain higher stored energy means that higher rotational speeds or greater rotational inertia are required, which requires greater flywheel volume, tougher rotor materials, and also means higher potential hazards and increased development costs. However, if two or more low-power energy storage flywheels with the same parameters are connected in parallel, the aim of high-power output can still be achieved theoretically. The parallel modular concept can be designed on the basis of the existing flywheel, so that the cost can be reduced, the research and development difficulty of the energy storage flywheel can be reduced, and the stability of the system can be improvedQualitative and safety. However, obtaining higher power output through parallel operation still has a series of key technical problems to be solved, for example, how to issue the total power instruction value to each flywheel to drive the flywheel to operate, according to what distribution strategy to perform power distribution, etc.
The existing concept of the equal-time-length control strategy is to perform dynamic real-time control according to the residual energy of each flywheel, so that the charging or discharging time (i.e. the time for reaching the lower limit of the speed) of each flywheel is equal. Namely:
t 1 ＝t 2 ＝…＝t n
if the ith flywheel rotates at the current speed omega i Starting the deceleration discharge at a lower speed limit of omega min Then the residual energy and discharge power of the ith flywheel are respectively
The compound can be obtained by three formulas:
wherein the order
The control strategy has good theoretical effect, but the actual operation is too complex and large in calculation amount, and the control strategy is difficult to realize on a low-performance control system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a charging and discharging power distribution method of an energy storage flywheel array.
The invention is realized by the following technical scheme:
a charge-discharge power distribution method for an energy storage flywheel array is provided with n flywheels, wherein the current rotating speed of the ith flywheel is omega i The lower limit of speed is omega min Upper limit of speed is ω max Defining the coefficient:
soeT＝soeFW[1]+soeFW[2]+…+soeFW[n]
soeTM＝(1-soeFW[1])+(1-soeFW[2])+…+(1-soeFW[n])
when charging is needed, the charging power of the ith flywheel is as follows:
P ei ＝P e ×soeFWP[i]wherein
P e Is a total charging power command value;
when discharging is needed, the discharging power of the ith flywheel is as follows:
In the above technical solution, the charging power P of the ith flywheel is obtained ei And discharge power of ith flywheel
The power is distributed to corresponding flywheel control systems, and each flywheel control system performs charge and discharge for an equal time length according to charge and discharge power.
At the upper partIn the technical scheme, the charging and discharging power distribution method of the energy storage flywheel array is realized by adopting a main controller, the main controller is connected with a man-machine interaction unit and control systems of all the flywheels, and a charging total power instruction value P is input to the main controller through the man-machine interaction unit e Or total discharge power command value
And the main controller calculates the charging power or the discharging power of the ith flywheel and then sends the charging power or the discharging power to the corresponding flywheel control system.
In the technical scheme, after receiving the total power command values of charging and discharging, the main controller can judge whether the total power command values of charging and discharging are effective, and if the total power command values of charging and discharging are not more than the rated maximum power command value, the command is considered to be effective.
In the technical scheme, after the main controller receives the total charging and discharging power instruction value, whether the No. i flywheel is on line or not can be judged, and if the No. i flywheel is on line, the charging and discharging power calculation of the No. i flywheel is carried out.
In the technical scheme, after the main controller receives the total charging and discharging power command value, whether the No. i flywheel has a fault or not can be judged, and if the No. i flywheel has no fault, the charging and discharging power of the No. i flywheel is calculated.
In the technical scheme, after the main controller receives the total charging and discharging power instruction value, whether the rotating speed of the ith flywheel is within the allowable range of the rated charging and discharging rotating speed and whether the contactor is switched on is judged, and if yes, the charging and discharging power calculation of the ith flywheel is carried out.
The invention has the advantages and beneficial effects that:
the invention can distribute the total power instruction according to the total power instruction value and the optimized equal-time long power distribution algorithm, and sends the distributed single power instruction value to each corresponding flywheel, thereby ensuring the safe and reliable operation of the energy storage flywheel array.
Compared with the existing equal-time length algorithm, the charging and discharging power distribution method is simpler and more effective, and can operate on a low-performance platform.
Drawings
Fig. 1 is a control strategy flow chart of a charging and discharging power distribution method of an energy storage flywheel array.
For a person skilled in the art, without inventive effort, other relevant figures can be derived from the above figures.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
Example one
A charge-discharge power distribution method for an energy storage flywheel array is provided with n flywheels, wherein the current rotating speed of the ith flywheel is omega i The lower limit of the speed is omega min Upper limit of speed is ω max Then the coefficients can be defined:
soeT＝soeFW[1]+soeFW[2]+…+soeFW[n]
soeTM＝(1-soeFW[1])+(1-soeFW[2])+…+(1-soeFW[n])
when charging is needed, the charging power of the ith flywheel is as follows:
P ei ＝P e ×soeFWP[i]in which
P e Is a total charging power command value;
when discharging is needed, the discharging power of the ith flywheel is as follows:
It can be seen that the charge and discharge power distribution method is also controlled based on the ratio of the residual energy, but the method is simpler and more effective than the existing equal-duration algorithm and can be operated on a low-performance platform.
The charging power P of the ith flywheel is obtained ei And discharge power of ith flywheel
The power is distributed to corresponding flywheel control systems, and each flywheel control system performs charge and discharge for an equal time length according to charge and discharge power. Namely:
during charging, each flywheel is charged according to the corresponding charging power P ei Charging is carried out, and the charging time of all the flywheels is equal, namely, all the flywheels reach the upper speed limit of omega max Are equal in time.
When discharging, each flywheel is in accordance with the corresponding discharge power
The discharge is carried out, and the discharge time of all the flywheels is equal, namely, all the flywheels reach the speed lower limit of omega min Are equal in time.
Example two
Fig. 1 is a flow chart of a control strategy of the charge-discharge power distribution method for the energy storage flywheel array, which is compiled in C language, and the specific implementation manner is as follows:
(I) start with
The program starts, entering from the main program.
(II) collecting total power instruction value
And collecting a simulated total power instruction value.
(III) determining if the Total Power Command is valid
And judging the total power instruction value obtained by calculation, wherein the total power instruction value can be a charging total power instruction value or a discharging total power instruction value, if the charging total power instruction value and the discharging total power instruction value are both less than or equal to the rated maximum power instruction value, the instruction is considered to be effective, and otherwise, the charging and discharging instruction is set to be 0.
(IV) judging whether the I flywheel is on line
And judging whether the flywheel No. i is online (i =1,2 \8230; n), if the flywheel No. i is online, carrying out the next step, and if not, returning to the main program.
(V) judging whether the flywheel I has fault
And judging whether the No. i flywheel has a fault (i =1,2 \8230; n), if not, carrying out the next step, otherwise, giving an alarm and returning to the main program.
(VI) judging whether the flywheel No. i can be charged and discharged
And judging whether the rotating speed of the i-type flywheel is within the allowable range of the rated charging and discharging rotating speed and whether the contactor is switched on, if so, allowing charging and discharging, and if not, returning to the main program.
(VII) charging and discharging power distribution algorithm for energy storage flywheel array
After all the judgment, according to the total power instruction value, the charging and discharging power distribution algorithm of the energy storage flywheel array of the first embodiment is adopted to calculate the current charging and discharging power instruction value of each flywheel.
(VIII) issue instruction
And sending the corrected charge and discharge power instruction values to a corresponding flywheel control system through the Ethernet, so that the flywheel control system can carry out charge and discharge according to the instructions.
(IX) judging whether the instruction transmission is overtime
And judging whether the transmission of the corrected charging and discharging control instruction is overtime, if the transmission is successful, returning to the main program, and if the transmission is overtime, returning to the previous step for retransmission.
The invention being thus described by way of example, it should be understood that any simple alterations, modifications or other equivalent alterations as would be within the skill of the art without the exercise of inventive faculty, are within the scope of the invention.
Claims (8)
1. Charge-discharge function of energy storage flywheel arrayThe rate allocation method is characterized in that: for n flywheels, the current rotating speed of the ith flywheel is omega i The lower limit of speed is omega min Upper limit of speed is ω min Defining the coefficient:
soeT＝soeFW[1]+soeFW[2]+…+soeFW[n]
soeTM＝(1-soeFW[1])+(1-soeFW[2])+…+(1-soeFW[n])
when charging is needed, the charging power of the ith flywheel is as follows:
P ei ＝P e ×soeFWP[i]wherein
P e Is a total charging power command value;
when discharging is needed, the discharging power of the ith flywheel is as follows:
during charging, each flywheel is charged according to the corresponding charging power P ei Charging is carried out, and the charging time of all the flywheels is equal, namely, all the flywheels reach the upper speed limit of omega max Are equal in time;
during discharging, each flywheel is in accordance with corresponding discharging power
The discharge is carried out, and the discharge time of all the flywheels is equal, namely, all the flywheels reach the speedThe lower limit is ω min Are equal in time.
2. The method for distributing charging and discharging power of the energy storage flywheel array according to claim 1, is characterized in that: the charging power P of the ith flywheel is obtained ei And discharge power of ith flywheel
The power is distributed to corresponding flywheel control systems, and each flywheel control system is charged and discharged according to the charging and discharging power.
3. The method for distributing charging and discharging power of the energy storage flywheel array according to claim 1, is characterized in that: the charging and discharging power distribution method of the energy storage flywheel array is realized by adopting a main controller, the main controller is connected with a man-machine interaction unit and control systems of all the flywheels, and a charging total power instruction value P is input to the main controller through the man-machine interaction unit e Or total discharge power command value
And the main controller calculates the charging power or the discharging power of the ith flywheel and then sends the charging power or the discharging power to the corresponding flywheel control system.
4. The method for distributing charging and discharging power of the energy storage flywheel array according to claim 3, is characterized in that: the main controller can judge whether the total charging and discharging power instruction is effective or not after receiving the total charging and discharging power instruction value, and if the total charging and discharging power instruction value is less than or equal to the rated maximum power instruction value, the instruction is considered to be effective.
5. The method for distributing charging and discharging power of the energy storage flywheel array according to claim 3, characterized in that: and after receiving the total charging and discharging power instruction value, the main controller judges whether the No. i flywheel is on line, and if the No. i flywheel is on line, the charging and discharging power calculation of the No. i flywheel is carried out.
6. The method for distributing charging and discharging power of the energy storage flywheel array according to claim 3, is characterized in that: and after receiving the total charging and discharging power command value, the main controller judges whether the ith flywheel has a fault, and if the ith flywheel does not have the fault, the main controller calculates the charging and discharging power of the ith flywheel.
7. The method for distributing charging and discharging power of the energy storage flywheel array according to claim 3, is characterized in that: and after receiving the total charging and discharging power instruction value, the main controller judges whether the rotating speed of the ith flywheel is within the allowable range of the rated charging and discharging rotating speed and whether the contactor is switched on, and if so, the charging and discharging power of the ith flywheel is calculated.
8. Use of a method of distributing charging and discharging power of an energy storing flywheel array as claimed in any one of claims 1 to 7 in the charging and discharging of an energy storing flywheel array.
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| US6614132B2 (en) * | 2001-11-30 | 2003-09-02 | Beacon Power Corporation | Multiple flywheel energy storage system |
| CN103219737B (en) * | 2013-05-09 | 2014-11-19 | 重庆大学 | Coordination control method applied to flywheel energy storage matrix system of wind power plant |
| CN103390920B (en) * | 2013-07-23 | 2015-06-24 | 大连融科储能技术发展有限公司 | All vanadium redox flow battery management method and system applied to scale energy storage |
| CN109167391A (en) * | 2018-10-11 | 2019-01-08 | 珠海吉瓦科技有限公司 | A kind of echelon battery energy storage power station energy management method and system based on set empirical mode decomposition |
| CN111431197A (en) * | 2020-05-26 | 2020-07-17 | 华驰动能(北京)科技有限公司 | Control method of energy storage flywheel parallel array system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015226344A (en) * | 2014-05-26 | 2015-12-14 | サンケン電気株式会社 | Power leveling device |
| CN112803453A (en) * | 2021-03-29 | 2021-05-14 | 沈阳微控新能源技术有限公司 | Flywheel energy storage system, control method of flywheel energy storage system and storage medium |
Non-Patent Citations (1)
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