CN113452047A - Generator power characteristic optimization system, method and device - Google Patents

Generator power characteristic optimization system, method and device Download PDF

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Publication number
CN113452047A
CN113452047A CN202110731954.XA CN202110731954A CN113452047A CN 113452047 A CN113452047 A CN 113452047A CN 202110731954 A CN202110731954 A CN 202110731954A CN 113452047 A CN113452047 A CN 113452047A
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power
converter
load
bidirectional
generator
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CN113452047B (en
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祝保红
王佳良
李光军
汪大春
李树胜
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Beijing Honghui International Energy Technology Development Co ltd
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Beijing Honghui International Energy Technology Development Co ltd
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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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention provides a power characteristic optimization system, a method and a device of a generator, relating to the technical field of electric power, wherein the system comprises a generator, a flywheel, a load, a central processing unit, a first alternating current-direct current converter and a second bidirectional alternating current-direct current converter, when the power of the load fluctuates, the flywheel can rapidly respond to the power fluctuation, the central processing unit integrates the power feedback information of the load, the running speed information of the load, the rotating speed information of the flywheel and the power feedback information of the generator to determine a first power adjustment instruction, and sends the first power adjustment instruction to the second bidirectional alternating current-direct current converter so that the sum of the output power of the second bidirectional alternating current-direct current converter and the output power of the first alternating current-direct current converter changes along with the power fluctuation of the load, a microgrid power supply system can smoothly adjust the output power of the generator, and the combustion efficiency of the generator is improved, the technical problem of poor power quality stability of a micro-grid power supply system in the prior art is effectively solved.

Description

Generator power characteristic optimization system, method and device
Technical Field
The invention relates to the technical field of electric power, in particular to a system, a method and a device for optimizing power characteristics of a generator.
Background
For a micro-grid scene with a periodic power load, energy conservation and efficiency improvement become a key research direction, for the working conditions of sudden increase and sudden decrease of load power, instantaneous sudden change of power quality can be generated, so that equipment runs under a non-rated condition, the service life of the equipment is shortened, meanwhile, the power of a generator side is unstable, insufficient fuel combustion can be caused, and energy waste is caused.
In summary, the micro-grid power supply system in the prior art has the technical problem of poor stability of power quality.
Disclosure of Invention
The invention aims to provide a system, a method and a device for optimizing power characteristics of a generator, so as to solve the technical problem of poor power quality stability of a micro-grid power supply system in the prior art.
In a first aspect, the present invention provides a generator power characteristic optimization system, comprising: the system comprises a generator, a flywheel, a load, a central processor, a first alternating current-direct current converter and a second bidirectional alternating current-direct current converter; the generator is respectively connected with the first end of the first AC-DC converter and the central processing unit; the flywheel is respectively connected with the first end of the second bidirectional AC-DC converter and the central processor; the second end of the first alternating current-direct current converter is respectively connected with the second end of the second bidirectional alternating current-direct current converter and the load; the central processing unit is also connected with a third end of the second bidirectional alternating current-direct current converter and the load; the first alternating current-direct current converter is used for transmitting the electric energy generated by the generator to the load; the second bidirectional AC/DC converter is used for transmitting the electric energy generated by the flywheel to the load; the central processing unit is used for acquiring target information and sending a first power adjustment instruction to the second bidirectional alternating current-direct current converter based on the target information so as to enable the power sum provided by the first alternating current-direct current converter and the second bidirectional alternating current-direct current converter to change along with the power fluctuation of the load; wherein the target information includes: power feedback information of the load, operating rate information of the load, rotational speed information of the flywheel, and power feedback information of the generator.
In an alternative embodiment, the load comprises: a third AC/DC converter and a load motor; the first end of the third AC/DC converter is respectively connected with the second end of the first AC/DC converter and the second end of the second bidirectional AC/DC converter; and the second end of the third AC-DC converter is connected with the first end of the load motor, and the second end of the load motor is connected with the central processing unit.
In an alternative embodiment, the generator power characteristic optimization system further comprises: auxiliary electric equipment; the first ac-dc converter includes: a first bidirectional AC/DC converter; the third ac-dc converter includes: a third bidirectional AC/DC converter; the first end of the auxiliary electric equipment is connected with the first end of the first bidirectional alternating current-direct current converter, and the second end of the auxiliary electric equipment is connected with the central processing unit; the central processing unit is also connected with the third end of the first bidirectional AC/DC converter and the third end of the third bidirectional AC/DC converter; the central processing unit is used for sending a mode switching instruction to the second bidirectional AC/DC converter and the third bidirectional AC/DC converter under the condition that the load motor is determined to have potential energy, so that the flywheel recovers the potential energy; the central processing unit is further configured to send a mode switching instruction to the first bidirectional ac-dc converter, the second bidirectional ac-dc converter, and the third bidirectional ac-dc converter when the flywheel completes the potential energy recovery, and send a second power adjustment instruction to the first bidirectional ac-dc converter based on first target power information fed back by the auxiliary electrical equipment, so that the first bidirectional ac-dc converter outputs a second target power to the auxiliary electrical equipment; wherein the first target power is greater than the second target power.
In a second aspect, the present invention provides a generator power characteristic optimization method, which is applied to the generator power characteristic optimization system described in any one of the foregoing embodiments, and includes: acquiring target information, wherein the target information comprises: the method comprises the following steps of (1) power feedback information of a load, running speed information of the load, rotating speed information of a flywheel and power feedback information of a generator; and sending a first power adjustment instruction to a second bidirectional alternating current-direct current converter based on the target information so that the sum of the power provided by the first alternating current-direct current converter and the power provided by the second bidirectional alternating current-direct current converter can follow the power fluctuation of the load.
In an alternative embodiment, sending a first power adjustment command to a second bidirectional ac-to-dc converter based on the target information includes: determining an operation state of the load based on the power feedback information of the load and the operation rate information of the load; wherein the operating state comprises: a first acceleration state, a second acceleration state, a third acceleration state, a constant speed state, a stop state and a braking state; determining a target output power of the second bidirectional AC-DC converter based on the operating state of the load, the rotation speed information of the flywheel and the power feedback information of the generator; a first power adjustment command is determined based on the target output power and sent to the second bidirectional AC-to-DC converter.
In an optional embodiment, determining the operating state of the load based on the power feedback information of the load and the operating rate information of the load comprises: acquiring a sampling period of load power, the maximum operating power of the load and the acceleration time for the load to reach the maximum operating power; sampling the power feedback information of the load based on the sampling period to obtain a power difference value of the load in the current sampling interval; determining a normalized load power slope based on the power difference, the sampling period, the maximum operating power, and the acceleration time; determining an operating state of the load based on the normalized load power slope, power feedback information of the load, and operating rate information of the load.
In an alternative embodiment, the power of the generator is determined based on the operating state of the load, the rotational speed information of the flywheel and the power of the generatorThe feedback information determining the target output power of the second bidirectional AC-DC converter comprises: acquiring the standby rotating speed of the flywheel, the current power of the second bidirectional alternating current-direct current converter and the rated power of the generator; determining the output power variation of the second bidirectional AC-DC converter in a preset corresponding relation based on the running state of the load and the rotation speed information of the flywheel; wherein the output power variation includes any one of: the power difference value of the load in the current sampling interval, the product of the power difference value and a flywheel power increment coefficient, a zero value and the free acceleration power increase rate of the flywheel; flywheel power increment coefficient K ═ f (P)f/Pm) F denotes the normalized load power slope, PfRepresenting the maximum released power, P, of the flywheelmRepresenting a maximum operating power of the load; determining a pre-output power of the second bidirectional AC-DC converter based on the current power of the second bidirectional AC-DC converter and the output power variation; in a target state, judging whether the pre-output power is larger than a rated power residual value of the generator or not; wherein the target state represents that the load is in a stop state, and the current rotating speed represented by the rotating speed information of the flywheel is less than the standby rotating speed; the rated power residual value is the difference value of the rated power of the generator and the real-time power represented by the power feedback information of the generator; if the pre-output power is larger than or equal to the target output power of the second bidirectional AC-DC converter, reducing the pre-output power to obtain the target output power of the second bidirectional AC-DC converter; wherein the target output power of the second bidirectional AC-DC converter is less than the remaining value of the rated power of the generator; if the pre-output power is smaller than the target output power, taking the pre-output power as the target output power of the second bidirectional AC/DC converter; and in a non-target state, taking the pre-output power as the target output power of the second bidirectional alternating-current/direct-current converter.
In an alternative embodiment, the method further comprises: under the condition that potential energy exists in the load motor, sending a mode switching command to the second bidirectional AC-DC converter and the third bidirectional AC-DC converter so that the flywheel recovers the potential energy; under the condition that the flywheel finishes potential energy recovery, sending a mode switching instruction to a first bidirectional AC/DC converter, a second bidirectional AC/DC converter and a third bidirectional AC/DC converter; receiving first target power information fed back by auxiliary electric equipment; sending a second power adjustment instruction to the first bidirectional AC/DC converter based on the first target power information so that the first bidirectional AC/DC converter outputs a second target power to auxiliary electric equipment; wherein the first target power is greater than the second target power.
In a third aspect, the present invention provides a generator power characteristic optimization apparatus applied to the generator power characteristic optimization system according to any one of the foregoing embodiments, the apparatus including: an obtaining module, configured to obtain target information, where the target information includes: the method comprises the following steps of (1) power feedback information of a load, running speed information of the load, rotating speed information of a flywheel and power feedback information of a generator; and the first sending module is used for sending a first power adjustment instruction to the second bidirectional alternating current-direct current converter based on the target information so as to enable the sum of the power provided by the first alternating current-direct current converter and the power provided by the second bidirectional alternating current-direct current converter to change along with the power fluctuation of the load.
In a fourth aspect, the present invention provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program operable on the processor, and the processor executes the computer program to implement the steps of the method according to any of the foregoing embodiments.
The invention provides a power characteristic optimization system of a generator, which comprises: the system comprises a generator, a flywheel, a load, a central processor, a first alternating current-direct current converter and a second bidirectional alternating current-direct current converter; the generator is respectively connected with the first end of the first AC-DC converter and the central processor; the flywheel is respectively connected with the first end of the second bidirectional AC-DC converter and the central processor; the second end of the first alternating current-direct current converter is respectively connected with the second end of the second bidirectional alternating current-direct current converter and the load; the central processing unit is also connected with a third end of the second bidirectional AC-DC converter and a load; the first alternating current-direct current converter is used for transmitting the electric energy generated by the generator to a load; the second bidirectional AC/DC converter is used for transmitting the electric energy generated by the flywheel to a load; the central processing unit is used for acquiring target information and sending a first power adjustment instruction to the second bidirectional AC/DC converter based on the target information so as to enable the power sum provided by the first AC/DC converter and the second bidirectional AC/DC converter to change along with the power fluctuation of the load; wherein the target information includes: power feedback information of the load, running speed information of the load, rotating speed information of the flywheel and power feedback information of the generator.
In the power characteristic optimization system of the generator, when the load power fluctuates, the flywheel can quickly respond to the power fluctuation, the central processing unit can determine a first power adjustment instruction by integrating the power feedback information of the load, the running speed information of the load, the rotating speed information of the flywheel and the power feedback information of the generator and send the first power adjustment instruction to the second bidirectional AC/DC converter, so that the sum of the output power of the second bidirectional AC-DC converter and the output power of the first AC-DC converter can follow the power fluctuation of the load, the micro-grid power supply system can perform smooth automatic adjustment on the output power of the generator, the combustion efficiency of the generator is effectively improved, energy is saved, and the technical problem of poor electric energy quality stability of the micro-grid power supply system in the prior art is effectively solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a system block diagram of a generator power characteristic optimization system according to an embodiment of the present invention;
FIG. 2 is a system block diagram of an alternative generator power characteristic optimization system provided by an embodiment of the present invention;
FIG. 3 is a system block diagram of another generator power characteristic optimization system provided by an embodiment of the present invention;
FIG. 4 is a flow chart of a method for optimizing power characteristics of a generator according to an embodiment of the present invention;
FIG. 5 is a functional block diagram of a power characteristic optimization apparatus for a generator according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an electronic device according to an embodiment of the present invention.
Icon: 100-a generator; 200-a flywheel; 300-load; 400-a central processing unit; 500-a first ac-dc converter; 600-a second bidirectional ac-dc converter; 700-auxiliary electric equipment; 301-load motor; 302-a third ac to dc converter; 303-a third bidirectional ac-dc converter; 501-a first bidirectional ac-dc converter; 10-an acquisition module; 20-a first sending module; 60-a processor; 61-a memory; 62-a bus; 63-communication interface.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
For a micro-grid scene with a periodic power load, such as a drilling platform, energy conservation and efficiency improvement become a key research direction, when the load in a power supply system suddenly increases or suddenly decreases, instantaneous sudden change of electric energy quality can be generated, so that equipment runs under a non-rated condition, the service life of the equipment is shortened, and meanwhile, the power of a generator side is unstable, so that insufficient fuel combustion can be caused, and energy waste is caused; in addition, the existing micro-grid power supply system does not effectively recycle load potential energy. Accordingly, embodiments of the present invention provide a generator power characteristic optimization system to alleviate the above-mentioned technical problems.
Example one
Fig. 1 is a system block diagram of a generator power characteristic optimization system according to an embodiment of the present invention, and as shown in fig. 1, the system specifically includes: generator 100, flywheel 200, load 300, cpu 400, first ac to dc converter 500, and second bidirectional ac to dc converter 600.
The generator 100 is respectively connected to a first end of the first ac/dc converter 500 and the central processor 400; the flywheel 200 is connected to the first end of the second bidirectional ac/dc converter 600 and the cpu 400, respectively; a second end of the first ac/dc converter 500 is connected to a second end of the second bidirectional ac/dc converter 600 and the load 300, respectively; the cpu 400 is further connected to a third terminal of the second bidirectional ac/dc converter 600 and the load 300.
The first ac/dc converter 500 is used for transmitting the electric energy generated by the generator 100 to the load 300; the second bidirectional ac/dc converter 600 is used to transmit the electric energy generated by the flywheel 200 to the load 300.
The central processing unit 400 is configured to obtain target information, and send a first power adjustment instruction to the second bidirectional ac/dc converter 600 based on the target information, so that the sum of the powers provided by the first ac/dc converter 500 and the second bidirectional ac/dc converter 600 changes along with the power fluctuation of the load 300; wherein the target information includes: power feedback information of load 300, operating rate information of load 300, rotational speed information of flywheel 200, and power feedback information of generator 100.
As a new technology, the magnetic suspension flywheel energy storage has the advantages of large instantaneous power, short-time high-frequency energy storage, long service life, less maintenance, high response speed, unlimited power, small size, easiness in movement and the like. Based on the above connection relationship between the internal components of the system, it can be known that both the generator 100 and the flywheel 200 can transmit the generated electric energy to the load 300 through the corresponding ac/dc converters, and the central processor 400 receives the target information to monitor the operating states of the generator 100, the flywheel 200, and the load 300.
Specifically, based on the power feedback information of the load 300, the central processing unit 400 can determine the real-time operating power of the load 300, and feed back the real-time operating power of the load 300 to the central processing unit 400, and the central processing unit 400 can compensate according to the change of the real-time operating power; based on the operation rate information of the load 300, the central processing unit 400 can determine the real-time operation rate of the load 300, for example, when the load 300 includes a load motor, the central processing unit 400 can determine the rotation speed of the load motor according to the operation rate information, and further can determine the motion state of the load motor; based on the power feedback information of the generator 100, the central processor 400 can determine the real-time power of the generator 100; based on the rotational speed information of the flywheel 200, the central processor 400 can determine the real-time rotational speed of the flywheel 200, and if the central processor 400 presets a flywheel rotational speed criterion threshold, the energy state (zero energy storage state, or under energy storage state, or over energy storage state, or full energy storage state) of the flywheel 200 can be determined by comparing the real-time rotational speed of the flywheel 200 with a plurality of rotational speed criterion thresholds.
When the power of the load 300 fluctuates, the central processing unit 400 can determine the power change information in real time, because the generator 100 responds slowly and the flywheel 200 responds quickly, after the power feedback information of the load 300, the operating speed information of the load 300, the rotation speed information of the flywheel 200 and the power feedback information of the generator 100 are comprehensively considered, the central processing unit 400 sends a first power adjustment instruction to the second bidirectional ac/dc converter 600, and adjusts the output power of the second bidirectional ac/dc converter 600 to instantaneously respond to the power fluctuation of the load 300, so that the sum of the powers provided by the first ac/dc converter 500 and the second bidirectional ac/dc converter 600 can change along with the power fluctuation of the load 300, and time is obtained for the microgrid system to smoothly adjust the output power of the generator 100.
In the power characteristic optimization system of the generator provided by the invention, when the power of the load 300 fluctuates, the flywheel 200 can rapidly respond to the power fluctuation, the cpu 400 can determine a first power adjustment command by integrating the power feedback information of the load 300, the operation rate information of the load 300, the rotation speed information of the flywheel 200, and the power feedback information of the generator 100, and transmit it to the second bidirectional ac/dc converter 600, so that the sum of the output power of the second bidirectional ac-dc converter 600 and the output power of the first ac-dc converter 500 can follow the power fluctuation of the load 300, the output power of the generator 100 can be smoothly and automatically adjusted by the micro-grid power supply system, the combustion efficiency of the generator 100 is effectively improved, energy is saved, and the technical problem of poor electric energy quality stability of the micro-grid power supply system in the prior art is effectively solved.
In an alternative embodiment, as shown in fig. 2, the load 300 includes: a third ac-dc converter 302 and a load motor 301;
a first end of the third ac/dc converter 302 is connected to a second end of the first ac/dc converter 500 and a second end of the second bidirectional ac/dc converter 600, respectively; a second end of the third ac/dc converter 302 is connected to a first end of the load motor 301, and a second end of the load motor 301 is connected to the cpu 400.
Generally, a user can configure the first ac/dc converter 500 with different models to make the ac voltage output by the generator 100 reach a preset dc voltage value after passing through the first ac/dc converter 500, for example, if the generator 100 outputs 380V ac, the first ac/dc converter 500 can be configured to make the first ac/dc converter 500 output 820V dc.
If the load motor 301 needs to use ac power, a third ac/dc converter 302 is provided to convert the dc power to ac power for the load motor 301. When the system is applied to a drilling platform, the load motor 301 may be a drawworks motor, a mud motor or a top drive motor. The embodiment of the invention does not specifically limit the types and the number of the load motors 301, and a user can set the load motors according to actual requirements.
The power characteristic optimization system of the generator provided by the embodiment of the present invention can improve the power quality of a microgrid power supply system, can meet the requirements of high power fluctuation and peak power fluctuation of a load, but cannot recycle the load potential energy, and for this situation, in order to further improve the energy utilization rate, in an optional implementation manner, as shown in fig. 3, the power characteristic optimization system of the generator further includes: the auxiliary electric device 700; the first ac/dc converter 500 includes: a first bidirectional ac-dc converter 501; the third ac/dc converter 302 includes: a third bidirectional ac-dc converter 303.
A first end of the auxiliary electric device 700 is connected with a first end of the first bidirectional ac/dc converter 501, and a second end of the auxiliary electric device 700 is connected with the central processing unit 400; the cpu 400 is further connected to a third terminal of the first bi-directional ac/dc converter 501 and a third terminal of the third bi-directional ac/dc converter 303.
The central processor 400 is configured to send a mode switching command to the second bidirectional ac/dc converter 600 and the third bidirectional ac/dc converter 303 to enable the flywheel 200 to recover potential energy when it is determined that the load motor 301 has potential energy.
The central processing unit 400 is further configured to, when the flywheel 200 completes recovery of the potential energy, send a mode switching instruction to the first bidirectional ac/dc converter 501, the second bidirectional ac/dc converter 600, and the third bidirectional ac/dc converter 303, and send a second power adjustment instruction to the first bidirectional ac/dc converter 501 based on the first target power information fed back by the auxiliary electric device 700, so that the first bidirectional ac/dc converter 501 outputs a second target power to the auxiliary electric device 700; wherein the first target power is greater than the second target power.
Specifically, the second bidirectional AC-DC converter 600 supports bidirectional transmission of energy, when the second bidirectional AC-DC converter 600 operates in the DC-AC mode, the flywheel 200 operates in the energy storage mode, and when the second bidirectional AC-DC converter 600 operates in the AC-DC mode, the flywheel 200 operates in the energy consumption mode. In order to recover potential energy of the load motor 301, the first ac/dc converter 500 and the third ac/dc converter 302 both support bidirectional energy transmission, so that the first bidirectional ac/dc converter 501 and the second bidirectional ac/dc converter 600 can transmit electric energy to the third bidirectional ac/dc converter 303, and the flywheel 200 can also recover potential energy of the load motor 301 through the second bidirectional ac/dc converter 600 and the third bidirectional ac/dc converter 303 and provide electric energy for the auxiliary electric device 700 through the first bidirectional ac/dc converter 501.
In the embodiment of the present invention, the first bidirectional AC/DC converter 501 and the second bidirectional AC/DC converter 600 are default to be configured to transmit electric energy to the third bidirectional AC/DC converter 303, that is, the first bidirectional AC/DC converter 501 and the second bidirectional AC/DC converter 600 are default to operate in the AC-DC mode, and the third bidirectional AC/DC converter 303 is default to operate in the DC-AC mode.
When the central processing unit 400 determines that the load motor 301 has potential energy, it first sends a mode switching command to the second bidirectional AC/DC converter 600 and the third bidirectional AC/DC converter 303, so that the third bidirectional AC/DC converter 303 operates in the AC-DC mode, and the second bidirectional AC/DC converter 600 operates in the DC-AC mode, so that the flywheel 200 can recover the potential energy of the load motor 301.
After the potential energy recovery is finished, the flywheel 200 may feed back the recovered potential energy to the power grid for use, and finally the flywheel 200 returns to the standby state to prepare for the next recovery, so that the central processor 400 needs to send a mode switching instruction to the first bidirectional AC/DC converter 501, the second bidirectional AC/DC converter 600, and the third bidirectional AC/DC converter 303 again, so that the second bidirectional AC/DC converter 600 is switched back to the AC-DC mode, the first bidirectional AC/DC converter 501 is switched back to the DC-AC mode, and the third bidirectional AC/DC converter 303 is switched back to the DC-AC mode, at this time, the flywheel 200 may provide energy to the DC bus and the auxiliary power consumption device 700.
After the mode switching is completed, the central processing unit 400 further needs to send a second power adjustment instruction to the first bidirectional ac/dc converter 501, and controls the second target power output by the first bidirectional ac/dc converter 501 to be smaller than the first target power fed back by the auxiliary electric device 700, because when the second target power is larger than the power value fed back by the auxiliary electric device 700, the power of the power grid is discharged everywhere, which further causes the voltage and frequency of the power grid to increase, and the generator 100 executes a shutdown action after detecting.
The embodiment of the invention does not specifically limit the value of the second target power, and a user can set the value according to actual requirements. When the flywheel 200 returns to the standby state, the first bidirectional AC/DC converter 501 needs to be adjusted to switch back to the AC-DC mode.
The power characteristic optimization system of the generator provided by the embodiment of the invention adopts the flywheel to compensate the load power, when the load power changes, the flywheel can quickly respond to provide compensation, the electric energy quality is effectively improved, time is provided for the change of the output power of the generator, and the combustion efficiency of the generator is improved; in addition, under the condition that the load motor has potential energy, the system can also support the recovery and the reutilization of the potential energy, and the purpose of saving energy is achieved.
Example two
The embodiment of the invention also provides a generator power characteristic optimization method, which is mainly applied to the generator power characteristic optimization system provided by the first embodiment, and the generator power characteristic optimization method provided by the embodiment of the invention is specifically described below.
Fig. 4 is a flowchart of a method for optimizing power characteristics of a generator according to an embodiment of the present invention, and as shown in fig. 4, the method specifically includes the following steps:
step S102, obtaining target information, wherein the target information comprises: power feedback information of the load, running speed information of the load, rotating speed information of the flywheel and power feedback information of the generator.
And step S104, sending a first power adjustment instruction to the second bidirectional AC/DC converter based on the target information so as to enable the sum of the power provided by the first AC/DC converter and the power provided by the second bidirectional AC/DC converter to change along with the power fluctuation of the load.
Specifically, an execution subject of the method for optimizing power characteristics of a generator according to the embodiment of the present invention is the central processing unit in the system for optimizing power characteristics of a generator according to the first embodiment, and a process of how the central processing unit specifically controls other constituent structures in the system in order to optimize power characteristics of a generator has been described above, and details of how to make a sum of powers provided by the first ac-dc converter and the second bidirectional ac-dc converter follow power fluctuation changes of a load will not be described herein again.
In an optional implementation manner, in step S104, sending the first power adjustment command to the second bidirectional ac-to-dc converter based on the target information specifically includes the following steps:
step S1041, determining an operation state of the load based on the power feedback information of the load and the operation rate information of the load.
In the embodiment of the present invention, in order to provide accurate compensation for load power fluctuation, the central processing unit first needs to determine the operating state of the load in combination with the power feedback information (used for representing the real-time operating power of the load) of the load and the operating rate information (used for representing the real-time operating rate of the load), where the operating state includes: a first acceleration state, a second acceleration state, a third acceleration state, a constant speed state, a stop state and a braking state; the first acceleration state represents a fast acceleration state, the second acceleration state represents a normal acceleration state, and the third acceleration state represents a slow acceleration state, i.e., the acceleration of the first acceleration state is greater than the acceleration of the second acceleration state, which is greater than the acceleration of the third acceleration state.
And step S1042, determining the target output power of the second bidirectional alternating current-direct current converter based on the running state of the load, the rotating speed information of the flywheel and the power feedback information of the generator.
When the load stops running and the flywheel is subjected to state adjustment, the maximum value of the free acceleration power (namely, the energy supplement power of the flywheel) of the flywheel cannot be larger than the difference value between the rated power of the generator and the real-time power of the generator. Therefore, after determining the operating state of the load, the cpu needs to combine the information of the rotation speed of the flywheel and the power feedback information of the generator to finally determine the target output power of the second bidirectional ac/dc converter.
In step S1043, a first power adjustment command is determined based on the target output power and sent to the second bidirectional ac-dc converter.
In an optional embodiment, in step S1041, the determining the operating state of the load based on the power feedback information of the load and the operating rate information of the load specifically includes the following steps:
step S10411, obtaining a sampling period of the load power, a maximum operating power of the load, and an acceleration time for the load to reach the maximum operating power.
When the power characteristic optimization system of the generator provided by the embodiment of the invention is used, the sampling period of the central processing unit for the load power can be set according to the requirements of users, the power characteristic optimization system is not specifically limited by the embodiment of the invention, and the maximum operating power of the load and the acceleration time of the load reaching the maximum operating power can be preset attribute parameters of the load.
Step S10412, sampling the power feedback information of the load based on the sampling period, and obtaining a power difference value of the load in the current sampling interval.
In the embodiment of the present invention, after the load power sampling period is determined, the load power may be sampled according to a fixed sampling interval, and optionally, only one load power value is collected in each sampling, so that the power difference of the load in the current sampling interval may be calculated through two times of sampling.
Step S10413, determining a normalized load power slope based on the power difference, the sampling period, the maximum operating power, and the acceleration time.
After obtaining the power difference of the load in the current sampling interval, the sampling period of the load power, the maximum operating power of the load power, and the acceleration time for the load to reach the maximum operating power, the embodiment of the present invention further needs to normalize the maximum increment of the power of the load per unit time, that is, to normalize the maximum increment of the power for the load to reach the maximum operating power P at the acceleration time tmIs normalized.
Specifically, the present example uses the formula f ═ Δ P/T)/(PmT) to determine a normalized load power slope, wherein f represents the normalized load power slope, Δ P represents the power difference of the load in the current sampling interval, T represents the sampling period of the load power, P represents the power of the loadmRepresents the maximum operating power of the load power, and t represents the acceleration time for the load to reach the maximum operating power.
Step S10414, determining an operation state of the load based on the normalized load power slope, the power feedback information of the load, and the operation rate information of the load.
According to the embodiment of the invention, the comparison table between the running state of the load and the normalized load power slope, the power feedback information of the load and the running rate information of the load is preset according to the multiple data characteristics of the load, so that the running state of the load can be determined by inquiring the preset comparison table after the normalized load power slope, the power feedback information of the load and the running rate information of the load are determined. Table 1 is a load operation state determination table provided in the embodiment of the present invention, and the numerical values in the table are provided only for example, and a user may adjust the table according to actual needs.
Table 1 load operation state decision table
Figure BDA0003140137310000151
In an optional embodiment, in the step S1042, the determining the target output power of the second bidirectional ac-dc converter based on the operating state of the load, the rotation speed information of the flywheel, and the power feedback information of the generator specifically includes the following steps:
step S10421, obtaining a standby rotation speed of the flywheel, a current power of the second bidirectional ac/dc converter, and a rated power of the generator.
Step S10422, determining an output power variation of the second bidirectional ac/dc converter in a preset corresponding relationship based on the operating state of the load and the rotation speed information of the flywheel.
Wherein the output power variation includes any one of: the power difference value of the load in the current sampling interval, the product of the power difference value and the flywheel power increment coefficient, a zero value and the free acceleration power increase rate of the flywheel; flywheel power increment coefficient K ═ f (P)f/Pm) And f denotes the normalized load power slope, PfRepresenting the maximum released power, P, of the flywheelmRepresenting the maximum operating power of the load.
In step S10423, the pre-output power of the second bidirectional ac/dc converter is determined based on the current power and the output power variation of the second bidirectional ac/dc converter.
As can be seen from the above description, the target output power of the second bidirectional ac/dc converter is limited by the difference between the rated power of the generator and the real-time power of the generator when the load stops operating and the flywheel is in a state adjustment state, so that in order to determine the target output power of the second bidirectional ac/dc converter in each operating state, it is necessary to determine not only the real-time power of the generator by receiving the power feedback information of the generator, but also the current rotation speed of the flywheel by receiving the rotation speed information of the flywheel, and it is necessary to determine the standby rotation speed of the flywheel (the rotation speed of the flywheel in a standby state) and the rated power of the generator in advance.
And when responding to the load power fluctuation, the central processing unit can determine the output power variation of the second bidirectional AC/DC converter by combining the load operation state and the flywheel operation state, and further determine the pre-output power of the second bidirectional AC/DC converter by combining the output power variation with the current power of the second bidirectional AC/DC converter. Wherein, according to different combinations of the load operation state and the flywheel operation state, the output power variation of the second bidirectional ac/dc converter can be selected from one of the following variations: the power difference value of the load in the current sampling interval, the product of the power difference value and the flywheel power increment coefficient, a zero value and the free acceleration power increase rate of the flywheel.
Specifically, in the embodiment of the present invention, the correspondence table between the output power variation of the second bidirectional ac/dc converter and the operation state of the load and the rotation speed information of the flywheel is preset, so that after the operation state of the load and the rotation speed information of the flywheel are determined, the preset correspondence table is queried, and the output power variation of the second bidirectional ac/dc converter can be preliminarily determined. Table 2 is a lookup table of the output power variation of the second bidirectional ac-dc converter according to the embodiment of the present invention, and the table further provides a reference value of the power variation (predicted value) of the generator.
In table 2, Δ P represents the power difference of the load in the current sampling interval, K represents the flywheel power increment coefficient, and P' represents the free-rise power increase rate of the flywheel.
TABLE 2 lookup table of output power variation of second bidirectional AC/DC converter
Figure BDA0003140137310000171
In a target state, the target output power of the second bidirectional ac/dc converter is limited by the difference between the rated power of the generator and the real-time power of the generator, where the target state indicates that the load is in a stopped state, and the current rotation speed indicated by the rotation speed information of the flywheel is less than the standby rotation speed, and therefore, after the pre-output power of the second bidirectional ac/dc converter is determined, the target output power of the second bidirectional ac/dc converter needs to be determined according to the load operation state and the current rotation speed of the flywheel.
Specifically, in the target state, the following step S10424 is executed; in the non-target state, the following step S10427 is performed.
Step S10424, judging whether the pre-output power is larger than the residual value of the rated power of the generator; and the residual value of the rated power is the difference value of the rated power of the generator and the real-time power represented by the power feedback information of the generator.
If the value is greater than or equal to the predetermined value, step S10425 is executed, and if the value is less than the predetermined value, step S10426 is executed.
Step S10425, reducing the pre-output power to obtain a target output power of the second bidirectional ac/dc converter; and the target output power of the second bidirectional alternating current-direct current converter is smaller than the rated power residual value of the generator.
In step S10426, the pre-output power is used as the target output power of the second bidirectional ac/dc converter.
Specifically, in the target state, if the pre-output power of the second bidirectional ac-dc converter is smaller than the remaining value of the rated power, the pre-output power is directly output as the target output power of the second bidirectional ac-dc converter without power adjustment again; however, if the pre-output power of the second bidirectional ac/dc converter is greater than or equal to the remaining rated power, the pre-output power must be reduced and then output, that is, the maximum free-wheeling power of the flywheel must not be greater than the remaining rated power. In this case, the reduction range of the pre-output power is not specifically limited in the embodiment of the present invention, and a user may set the reduction range according to an actual requirement.
In step S10427, the pre-output power is used as the target output power of the second bidirectional ac/dc converter.
In an alternative embodiment, the method of the present invention further comprises the steps of:
step S201, under the condition that the potential energy of the load motor is determined, a mode switching command is sent to the second bidirectional AC/DC converter and the third bidirectional AC/DC converter, so that the flywheel recovers the potential energy.
Step S202, under the condition that the recovery of the potential energy of the flywheel is completed, a mode switching command is sent to the first bidirectional AC/DC converter, the second bidirectional AC/DC converter and the third bidirectional AC/DC converter.
Step S203, receiving the first target power information fed back by the auxiliary electrical device.
Step S204, a second power adjustment instruction is sent to the first bidirectional AC/DC converter based on the first target power information, so that the first bidirectional AC/DC converter outputs second target power to the auxiliary electric equipment; wherein the first target power is greater than the second target power.
In order to recover energy from the load potential energy, the first ac-dc converter and the third ac-dc converter should be the first bidirectional ac-dc converter and the third bidirectional ac-dc converter, respectively, in addition to the second bidirectional ac-dc converter, that is, both the first ac-dc converter and the third bidirectional ac-dc converter support bidirectional transmission of energy. And in the process of energy recycling, the calculation of the pre-output power of the second bidirectional ac/dc converter can also refer to the correspondence relationship in table 2 above. In the first embodiment, a process of recycling load potential energy of the generator power characteristic optimization system has been described in detail, and details are not described herein.
In summary, after the flywheel is used for load power compensation, when the load power suddenly drops, the output power of the flywheel can drop along with the load power; when the load power is suddenly increased, although the generator responds slowly and the grid frequency is reduced, the flywheel can instantly output the power required by the load by utilizing the advantage of quick response through the timely regulation and control of the central processing unit; if the load continues to operate at high power, the flywheel will slowly reduce power after it rapidly provides a response, because the power grid will gradually adjust the generator output power, and when the generator output power is equal to the load power, the flywheel power will also return to the standby mode. Through the analysis, the power fluctuation and the peak of the load side can be completely absorbed by the power characteristic optimization system of the generator provided by the embodiment of the invention, the power of the generator is smoothly adjusted, and the combustion efficiency of the generator is effectively improved.
In addition, when the load motor has potential energy, the flywheel can also recover and recycle the potential energy, the central processing unit can adjust the first bidirectional alternating current-direct current converter to output second target power according to the first target power information fed back by the auxiliary electric equipment, the second target power is ensured to be smaller than the first target power, and when the flywheel returns to the standby state again, the next energy recovery can be carried out at any time. In summary, the method provided by the embodiment of the invention can improve the system response performance, maintain the stability of the power quality, improve the utilization rate of the whole energy, and achieve the purpose of saving energy.
EXAMPLE III
The embodiment of the invention also provides a generator power characteristic optimization device, which is mainly applied to the generator power characteristic optimization system provided by the first embodiment of the invention, and the generator power characteristic optimization device provided by the embodiment of the invention is specifically described below.
Fig. 5 is a functional block diagram of a power characteristic optimization apparatus for a generator according to an embodiment of the present invention, and as shown in fig. 5, the apparatus mainly includes: an obtaining module 10 and a first sending module 20, wherein:
an obtaining module 10, configured to obtain target information, where the target information includes: power feedback information of the load, running speed information of the load, rotating speed information of the flywheel and power feedback information of the generator.
And a first sending module 20, configured to send a first power adjustment command to the second bidirectional ac-to-dc converter based on the target information, so that a sum of the powers provided by the first ac-to-dc converter and the second bidirectional ac-to-dc converter varies with power fluctuation of the load.
The embodiment of the invention provides a power characteristic optimization device of a generator, which comprises: the device comprises an acquisition module 10 and a first sending module 20, wherein the acquisition module 10 is configured to acquire target information, and the target information includes: the method comprises the following steps of (1) power feedback information of a load, running speed information of the load, rotating speed information of a flywheel and power feedback information of a generator; the first sending module 20 is configured to send a first power adjustment instruction to the second bidirectional ac/dc converter based on the target information, so that the sum of the power provided by the first ac/dc converter and the power provided by the second bidirectional ac/dc converter changes along with the power fluctuation of the load, and further, the output power of the generator can be smoothly and automatically adjusted by the microgrid power supply system, the combustion efficiency of the generator is effectively improved, energy is saved, and the technical problem that the microgrid power supply system in the prior art is poor in power quality stability is effectively solved.
Optionally, the first sending module 20 includes:
a first determining unit for determining an operation state of the load based on power feedback information of the load and operation rate information of the load; wherein, the running state includes: the device comprises a first acceleration state, a second acceleration state, a third acceleration state, a constant speed state, a stop state and a braking state.
And the second determination unit is used for determining the target output power of the second bidirectional alternating current-direct current converter based on the running state of the load, the rotating speed information of the flywheel and the power feedback information of the generator.
And the sending unit is used for determining a first power adjustment instruction based on the target output power and sending the first power adjustment instruction to the second bidirectional AC-DC converter.
Optionally, the first determining unit is specifically configured to:
and acquiring a sampling period of the load power, the maximum running power of the load and the acceleration time for the load to reach the maximum running power.
And sampling the power feedback information of the load based on the sampling period to obtain the power difference value of the load in the current sampling interval.
A normalized load power slope is determined based on the power difference, the sampling period, the maximum operating power, and the acceleration time.
Determining an operating state of the load based on the normalized load power slope, the power feedback information of the load, and the operating rate information of the load.
Optionally, the second determining unit is specifically configured to:
and acquiring the standby rotating speed of the flywheel, the current power of the second bidirectional AC-DC converter and the rated power of the generator.
Determining the output power variation of the second bidirectional AC-DC converter in a preset corresponding relation based on the running state of the load and the rotation speed information of the flywheel; wherein the output power variation includes any one of: the power difference value of the load in the current sampling interval, the product of the power difference value and the flywheel power increment coefficient, a zero value and the free acceleration power increase rate of the flywheel; flywheel power increment coefficient K ═ f (P)f/Pm) And f denotes the normalized load power slope, PfRepresenting the maximum released power, P, of the flywheelmRepresenting the maximum operating power of the load.
The pre-output power of the second bidirectional AC/DC converter is determined based on the current power and the output power variation of the second bidirectional AC/DC converter.
In the target state, judging whether the pre-output power is larger than the residual value of the rated power of the generator or not; the target state represents that the load is in a stop state, and the current rotating speed represented by the rotating speed information of the flywheel is less than the standby rotating speed; the rated power surplus value is the difference value of the rated power of the generator and the real-time power represented by the power feedback information of the generator.
If the pre-output power is larger than or equal to the target output power of the second bidirectional AC-DC converter, reducing the pre-output power; and the target output power of the second bidirectional alternating current-direct current converter is smaller than the rated power residual value of the generator.
And if the pre-output power is smaller than the target output power, the pre-output power is used as the target output power of the second bidirectional AC-DC converter.
And in the non-target state, the pre-output power is used as the target output power of the second bidirectional alternating current-direct current converter.
Optionally, the apparatus further comprises:
and the second sending module is used for sending a mode switching instruction to the second bidirectional AC/DC converter and the third bidirectional AC/DC converter under the condition that the potential energy of the load motor is determined to exist, so that the flywheel recovers the potential energy.
And the third sending module is used for sending a mode switching command to the first bidirectional AC/DC converter, the second bidirectional AC/DC converter and the third bidirectional AC/DC converter under the condition that the recovery of the potential energy of the flywheel is completed.
The receiving module is used for receiving first target power information fed back by the auxiliary electric equipment.
The fourth sending module is used for sending a second power adjustment instruction to the first bidirectional alternating current-direct current converter based on the first target power information so that the first bidirectional alternating current-direct current converter outputs second target power to the auxiliary electric equipment; wherein the first target power is greater than the second target power.
Example four
Referring to fig. 6, an embodiment of the present invention provides an electronic device, including: a processor 60, a memory 61, a bus 62 and a communication interface 63, wherein the processor 60, the communication interface 63 and the memory 61 are connected through the bus 62; the processor 60 is arranged to execute executable modules, such as computer programs, stored in the memory 61.
The Memory 61 may include a high-speed Random Access Memory (RAM) and may also include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication connection between the network element of the system and at least one other network element is realized through at least one communication interface 63 (which may be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network, and the like can be used.
The bus 62 may be an ISA bus, PCI bus, EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one arrow is shown in FIG. 6, but this does not indicate only one bus or one type of bus.
The memory 61 is used for storing a program, the processor 60 executes the program after receiving an execution instruction, and the method executed by the apparatus defined by the flow process disclosed in any of the foregoing embodiments of the present invention may be applied to the processor 60, or implemented by the processor 60.
The processor 60 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 60. The Processor 60 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory 61, and the processor 60 reads the information in the memory 61 and, in combination with its hardware, performs the steps of the above method.
The computer program product of the system, the method and the device for optimizing power characteristics of a generator according to the embodiments of the present invention includes a computer-readable storage medium storing a processor-executable nonvolatile program code, where instructions included in the program code may be used to execute the method described in the foregoing method embodiments, and specific implementation may refer to the method embodiments and will not be described herein again.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A generator power characteristic optimization system, comprising: the system comprises a generator, a flywheel, a load, a central processor, a first alternating current-direct current converter and a second bidirectional alternating current-direct current converter;
the generator is respectively connected with the first end of the first AC-DC converter and the central processing unit; the flywheel is respectively connected with the first end of the second bidirectional AC-DC converter and the central processor; the second end of the first alternating current-direct current converter is respectively connected with the second end of the second bidirectional alternating current-direct current converter and the load; the central processing unit is also connected with a third end of the second bidirectional alternating current-direct current converter and the load;
the first alternating current-direct current converter is used for transmitting the electric energy generated by the generator to the load;
the second bidirectional AC/DC converter is used for transmitting the electric energy generated by the flywheel to the load;
the central processing unit is used for acquiring target information and sending a first power adjustment instruction to the second bidirectional alternating current-direct current converter based on the target information so as to enable the power sum provided by the first alternating current-direct current converter and the second bidirectional alternating current-direct current converter to change along with the power fluctuation of the load; wherein the target information includes: power feedback information of the load, operating rate information of the load, rotational speed information of the flywheel, and power feedback information of the generator.
2. The generator power characteristic optimization system of claim 1, wherein the load comprises: a third AC/DC converter and a load motor;
the first end of the third AC/DC converter is respectively connected with the second end of the first AC/DC converter and the second end of the second bidirectional AC/DC converter; and the second end of the third AC-DC converter is connected with the first end of the load motor, and the second end of the load motor is connected with the central processing unit.
3. The generator power characteristic optimization system of claim 2, further comprising: auxiliary electric equipment; the first ac-dc converter includes: a first bidirectional AC/DC converter; the third ac-dc converter includes: a third bidirectional AC/DC converter;
the first end of the auxiliary electric equipment is connected with the first end of the first bidirectional alternating current-direct current converter, and the second end of the auxiliary electric equipment is connected with the central processing unit; the central processing unit is also connected with the third end of the first bidirectional AC/DC converter and the third end of the third bidirectional AC/DC converter;
the central processing unit is used for sending a mode switching instruction to the second bidirectional AC/DC converter and the third bidirectional AC/DC converter under the condition that the load motor is determined to have potential energy, so that the flywheel recovers the potential energy;
the central processing unit is further configured to send a mode switching instruction to the first bidirectional ac-dc converter, the second bidirectional ac-dc converter, and the third bidirectional ac-dc converter when the flywheel completes the potential energy recovery, and send a second power adjustment instruction to the first bidirectional ac-dc converter based on first target power information fed back by the auxiliary electrical equipment, so that the first bidirectional ac-dc converter outputs a second target power to the auxiliary electrical equipment; wherein the first target power is greater than the second target power.
4. A generator power characteristic optimization method applied to the generator power characteristic optimization system according to any one of claims 1 to 3, the method comprising:
acquiring target information, wherein the target information comprises: the method comprises the following steps of (1) power feedback information of a load, running speed information of the load, rotating speed information of a flywheel and power feedback information of a generator;
and sending a first power adjustment instruction to a second bidirectional alternating current-direct current converter based on the target information so that the sum of the power provided by the first alternating current-direct current converter and the power provided by the second bidirectional alternating current-direct current converter can follow the power fluctuation of the load.
5. The method of claim 4, wherein sending a first power adjustment command to a second bidirectional AC-to-DC converter based on the target information comprises:
determining an operation state of the load based on the power feedback information of the load and the operation rate information of the load; wherein the operating state comprises: a first acceleration state, a second acceleration state, a third acceleration state, a constant speed state, a stop state and a braking state;
determining a target output power of the second bidirectional AC-DC converter based on the operating state of the load, the rotation speed information of the flywheel and the power feedback information of the generator;
a first power adjustment command is determined based on the target output power and sent to the second bidirectional AC-to-DC converter.
6. The method of claim 5, wherein determining the operating state of the load based on the power feedback information of the load and the operating rate information of the load comprises:
acquiring a sampling period of load power, the maximum operating power of the load and the acceleration time for the load to reach the maximum operating power;
sampling the power feedback information of the load based on the sampling period to obtain a power difference value of the load in the current sampling interval;
determining a normalized load power slope based on the power difference, the sampling period, the maximum operating power, and the acceleration time;
determining an operating state of the load based on the normalized load power slope, power feedback information of the load, and operating rate information of the load.
7. The method of claim 6, wherein determining the target output power of the second bidirectional DC to DC converter based on the operating state of the load, the rotational speed information of the flywheel, and the power feedback information of the generator comprises:
acquiring the standby rotating speed of the flywheel, the current power of the second bidirectional alternating current-direct current converter and the rated power of the generator;
determining the output power variation of the second bidirectional AC-DC converter in a preset corresponding relation based on the running state of the load and the rotation speed information of the flywheel; wherein the output power variation includes any one of: the power difference value of the load in the current sampling interval, the product of the power difference value and a flywheel power increment coefficient, a zero value and the free acceleration power increase rate of the flywheel; flywheel power increment coefficient K ═ f (P)f/Pm) F denotes the normalized load power slope, PfRepresenting the maximum released power, P, of the flywheelmRepresenting a maximum operating power of the load;
determining a pre-output power of the second bidirectional AC-DC converter based on the current power of the second bidirectional AC-DC converter and the output power variation;
in a target state, judging whether the pre-output power is larger than a rated power residual value of the generator or not; wherein the target state represents that the load is in a stop state, and the current rotating speed represented by the rotating speed information of the flywheel is less than the standby rotating speed; the rated power residual value is the difference value of the rated power of the generator and the real-time power represented by the power feedback information of the generator;
if the pre-output power is larger than or equal to the target output power of the second bidirectional AC-DC converter, reducing the pre-output power to obtain the target output power of the second bidirectional AC-DC converter; wherein the target output power of the second bidirectional AC-DC converter is less than the remaining value of the rated power of the generator;
if the pre-output power is smaller than the target output power, taking the pre-output power as the target output power of the second bidirectional AC/DC converter;
and in a non-target state, taking the pre-output power as the target output power of the second bidirectional alternating-current/direct-current converter.
8. The method of claim 4, further comprising:
under the condition that potential energy exists in the load motor, sending a mode switching command to the second bidirectional AC-DC converter and the third bidirectional AC-DC converter so that the flywheel recovers the potential energy;
under the condition that the flywheel finishes potential energy recovery, sending a mode switching instruction to a first bidirectional AC/DC converter, a second bidirectional AC/DC converter and a third bidirectional AC/DC converter;
receiving first target power information fed back by auxiliary electric equipment;
sending a second power adjustment instruction to the first bidirectional AC/DC converter based on the first target power information so that the first bidirectional AC/DC converter outputs a second target power to auxiliary electric equipment; wherein the first target power is greater than the second target power.
9. A generator power characteristic optimization apparatus applied to the generator power characteristic optimization system according to any one of claims 1 to 3, the apparatus comprising:
an obtaining module, configured to obtain target information, where the target information includes: the method comprises the following steps of (1) power feedback information of a load, running speed information of the load, rotating speed information of a flywheel and power feedback information of a generator;
and the first sending module is used for sending a first power adjustment instruction to the second bidirectional alternating current-direct current converter based on the target information so as to enable the sum of the power provided by the first alternating current-direct current converter and the power provided by the second bidirectional alternating current-direct current converter to change along with the power fluctuation of the load.
10. An electronic device comprising a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein the processor implements the steps of the method of any of the preceding claims 4 to 8 when executing the computer program.
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CN106385044A (en) * 2016-09-30 2017-02-08 安徽工程大学 Composite energy storage control system used for wind power plant power generation plan tracking and control method thereof
CN110112724A (en) * 2019-04-19 2019-08-09 微控物理储能研究开发（深圳）有限公司 Flywheel energy storage device and generating set joint power supply system and control method
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5936375A (en) * 1997-11-05 1999-08-10 Paceco Corp. Method for energy storage for load hoisting machinery
CN106385044A (en) * 2016-09-30 2017-02-08 安徽工程大学 Composite energy storage control system used for wind power plant power generation plan tracking and control method thereof
CN110112724A (en) * 2019-04-19 2019-08-09 微控物理储能研究开发（深圳）有限公司 Flywheel energy storage device and generating set joint power supply system and control method
CN111980102A (en) * 2020-09-01 2020-11-24 北京泓慧国际能源技术发展有限公司 Loader power system and loader

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