CN109449962B - Energy storage frequency modulation method, device, system, computer equipment and storage medium - Google Patents
Energy storage frequency modulation method, device, system, computer equipment and storage medium Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
The application relates to an energy storage frequency modulation method, which comprises the following steps: receiving an AGC instruction, and determining an expected force output value and response time according to the AGC instruction; acquiring a unit output value, and calculating a difference value between the expected output value and the unit output value; determining an energy storage mode based on a preset difference threshold, preset response time, a difference and the response time; and sending a control instruction to the corresponding energy storage device based on the energy storage mode to control the corresponding energy storage device to output force. By the method, different energy storage modes can be selected according to different conditions, so that the electricity consumption cost is reduced while the frequency modulation performance of the generator set is ensured. The application also provides an energy storage frequency modulation device, a system, computer equipment and a storage medium.
Description
Technical Field
The present disclosure relates to the field of power technologies, and in particular, to an energy storage frequency modulation method, an energy storage frequency modulation apparatus, an energy storage frequency modulation system, a computer device, and a storage medium.
Background
With the rapid development of new energy power generation and the grid connection of a large number of new energy generator sets, the structure of an electric power system changes. The new energy power generation is limited by functional specifications and other reasons, the frequency regulation function is not provided at present basically, the relative inertia ratio of the whole system is reduced along with the gradual increase of the occupation ratio of a new energy generator set, the available frequency modulation resources are less and less, the system frequency regulation capability is obviously reduced, the frequency stability problem of a power grid is increasingly prominent, and the structural dilemma exists in the existing power system.
In an electric power system, AGC mainly realizes the control of the frequency of a power grid and the power of a connecting line by adjusting the active power output of a frequency modulation power supply in the power grid in real time, solves the problem of active imbalance with random characteristics in a regional power grid with a short time scale of second or minute level, and provides higher requirements on AGC power supply performance, such as high adjusting speed, high adjusting precision, frequent power adjusting direction conversion and the like. The existing thermal power generating unit adopts electrochemical energy storage to participate in AGC combined frequency modulation of the thermal power plant, an electrochemical energy storage system is high in adjusting speed and adjusting precision and has quick and accurate response capability, and the electrochemical energy storage system is used for combined frequency modulation of the thermal power generating unit and can obtain better effect; however, this method has high requirements for electrochemical energy storage cells, and the energy storage cells have high loss, resulting in high electricity consumption cost.
Disclosure of Invention
In view of the foregoing, it is desirable to provide an energy storage frequency modulation method, apparatus, system, computer device and storage medium.
A method of energy storage frequency modulation, the method comprising:
receiving an AGC instruction, and determining an expected force output value and response time according to the AGC instruction;
acquiring a unit output value, and calculating a difference value between the expected output value and the unit output value;
determining an energy storage mode based on a preset difference threshold, a preset response time, the difference and the response time;
and sending a control instruction to the corresponding energy storage device based on the energy storage mode, and controlling the corresponding energy storage device to output force.
In one embodiment, the energy storage mode includes: a physical energy storage mode and a chemical energy storage mode;
the determining an energy storage mode based on a preset difference threshold, a preset response time, the difference and the response time comprises:
and when the difference is smaller than the preset difference threshold and the response time is larger than or equal to the preset response time, determining that the energy storage mode is a chemical energy storage mode.
In one embodiment, the sending a control command to a corresponding energy storage device based on the energy storage manner to control the corresponding energy storage device to output power includes:
and sending a control instruction to a chemical energy storage device based on the chemical energy storage mode to control the chemical energy storage device to output power.
In one embodiment, the determining the energy storage mode based on the preset difference threshold, the preset response time, the difference and the response time includes: and when the difference is greater than or equal to the preset difference threshold, determining that the energy storage mode is a physical energy storage mode.
In one embodiment, the determining the energy storage mode based on the preset difference threshold, the preset response time, the difference and the response time includes: and when the response time is less than the preset response time, determining that the energy storage mode is a physical energy storage mode.
In one embodiment, the sending a control command to a corresponding energy storage device based on the energy storage manner to control the corresponding energy storage device to output power includes:
and sending a control instruction to a physical energy storage device based on the physical energy storage mode to control the physical energy storage device to output power.
In one embodiment, the physical stored energy comprises: the flywheel stores energy.
In one embodiment, the chemical stored energy comprises: and (4) electrochemical energy storage.
An energy storage frequency modulation device, the device comprising:
the AGC instruction receiving module is used for receiving an AGC instruction and determining an expected force output value and response time according to the AGC instruction;
the unit output value acquisition module is used for acquiring a unit output value and calculating a difference value between the expected output value and the unit output value;
the energy storage mode determining module is used for determining an energy storage mode based on a preset difference threshold, preset response time, the difference and the response time;
and the control module is used for sending a control instruction to the corresponding energy storage device based on the energy storage mode and controlling the corresponding energy storage device to output force.
An energy storage frequency modulation system, the system comprising: the system comprises a remote terminal control unit, a distributed control unit, an energy storage main control unit, a generator set and an energy storage device;
the remote terminal control unit forwards the AGC command to the distributed control unit and the energy storage main control unit when receiving the AGC command sent by a power grid dispatching center;
the distributed control unit controls the generator set to output based on the AGC command and sends the generator set output value of the generator set to the energy storage main control unit;
the energy storage main control unit determines an expected force output value and response time according to the AGC command; when a unit output force value sent by the decentralized control unit is received, calculating a difference value between the expected output force value and the unit output force value; determining an energy storage mode based on a preset difference threshold, a preset response time, the difference and the response time; and sending a control instruction to the corresponding energy storage device based on the energy storage mode to control the corresponding energy storage device to output force.
A computer device comprising a memory storing a computer program and a processor implementing the steps of the above method when executing the computer program.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
According to the energy storage frequency modulation method, the device, the computer equipment, the storage medium and the energy storage frequency modulation system, when an AGC instruction is received, the output value and the response time of a power grid expected by a power grid dispatching center are determined, the output value of a unit is obtained, the difference value between the expected output value and the output value of the unit is determined, and the output of the difference value is performed through the energy storage device; and then, respectively comparing the difference value and the response time with a preset difference value threshold value and preset response time, determining an energy storage mode, and controlling the corresponding energy storage device to output force based on the energy storage mode. By the method, different energy storage modes can be selected according to different conditions, so that the electricity consumption cost is reduced while the frequency modulation performance of the unit is ensured.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of a method for frequency modulation of stored energy;
FIG. 2 is a schematic diagram of flywheel energy storage and electrochemical energy storage coupled with frequency modulation in one embodiment;
FIG. 3 is a schematic flow chart of an energy storage frequency modulation method according to another embodiment;
FIG. 4 is a schematic flow chart of an energy storage frequency modulation method according to another embodiment;
FIG. 5 is a schematic flow chart of a method for frequency modulation of stored energy according to an embodiment;
FIG. 6 is a block diagram of an embodiment of an energy storage frequency modulation device;
FIG. 7 is a schematic diagram of an embodiment of an energy storage frequency modulation system;
FIG. 8 is a schematic diagram of the operation of an energy storage frequency modulation system in one embodiment;
FIG. 9 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In an embodiment of the present application, as shown in fig. 1, there is provided an energy storage frequency modulation method, including steps S110 to S140.
And step S110, receiving an AGC instruction, and determining an expected force output value and response time according to the AGC instruction.
In one embodiment, the AGC (Automatic Generation Control) command is a command sent from a grid dispatching center and forwarded by a Remote Terminal Unit (RTU) of a power plant, and the AGC command is used for adjusting the generator active output of the power plant to respond to a system of load change. In the embodiment, the output value limited by the AGC instruction is recorded as an expected output value; in addition, the AGC command also defines the response time of the output. The response time refers to the time for the unit to reliably span out the regulation dead zone consistent with the regulation direction on the basis of the original force output point after the command is issued. The generator set in the combined energy storage frequency modulation device is a main output part, and the output of the rest parts except the output of the generator set is completed by the energy storage device.
In this embodiment, after receiving the AGC instruction forwarded by the RTU, the energy storage main control unit determines the expected output value and the response time according to the AGC instruction.
And step S120, acquiring a unit output value, and calculating a difference value between the expected output value and the unit output value.
And subtracting the expected output value from the output value of the generator set to obtain a difference value which is the value of the output of the energy storage device. In one embodiment, the unit output value may be a value of the unit output determined by a Distributed Control System (DCS), and after the DCS sends the unit output value to the energy storage main Control unit, the energy storage main Control unit may calculate a difference between the expected output value and the unit output value. The power plant decentralized control unit integrates the execution component and the data acquisition function into one device.
And step S130, determining an energy storage mode based on a preset difference threshold, preset response time, the difference and the response time.
In this embodiment, the preset difference threshold and the preset response time are used as reference objects for determining the judgment condition of the energy storage mode. And further, comparing the difference value with a preset difference value threshold value, comparing the response time with a preset response time, and determining an energy storage mode according to a comparison result.
The energy storage mode is an energy storage mode of the energy storage device; the energy storage device can store energy when the load of the power grid is low, and can also output energy when the load of the power grid is high, so that the energy storage device is used for clipping peaks and filling valleys and reducing the fluctuation of the power grid. Energy takes many forms, including radiation, chemical, gravitational potential, electrical potential, electricity, heat, latent heat, and kinetic energy. Energy storage involves the conversion of energy in a form that is difficult to store into a more convenient or economically storable form.
Wherein, in one embodiment, the energy storage mode comprises: physical energy storage mode and chemical energy storage mode. In one embodiment, determining the energy storage mode based on the preset difference threshold, the preset response time, the difference and the response time includes: and comparing the difference value with a preset difference value threshold value, comparing the response time with the preset response time to obtain a comparison result, and determining an energy storage mode according to the comparison result. For example, when the comparison result satisfies a first preset condition, the energy storage mode may be determined as physical energy storage, and when the comparison result satisfies a second preset condition, the energy storage mode may be determined as chemical energy storage.
Further, in a specific embodiment, the determining the energy storage mode based on the preset difference threshold, the preset response time, the difference, and the response time includes: and when the difference is smaller than a preset difference threshold value and the response time is greater than or equal to the preset response time, determining that the energy storage mode is a chemical energy storage mode.
Further, the energy storage mode is determined based on a preset difference threshold, a preset response time, the difference and the response time, and the method further comprises the following steps: and when the difference value is greater than or equal to the preset difference value threshold value, determining that the energy storage mode is a physical energy storage mode.
Further, determining an energy storage mode based on the preset difference threshold, the preset response time, the difference and the response time, further includes: and when the response time is less than the preset response time, determining that the energy storage mode is a physical energy storage mode.
The physical energy storage mode can be energy storage realized by physical methods such as pumping, compressing air, flywheel and the like, and has the advantages of environmental protection and environmental protection. Chemical energy storage includes storing electrical energy using various types of batteries, renewable fuel cells, flow batteries, super capacitors, and the like.
In one embodiment, the physical energy storage of the present application employs flywheel energy storage. The flywheel energy storage means an energy storage mode that a motor drives a flywheel to rotate at a high speed and the flywheel drives a generator to generate electricity when needed. The technical characteristics are high power density and long service life. When the electric energy is stored in a flywheel energy storage mode, the electric energy is converted by the power converter and then drives the motor to operate, the motor drives the flywheel to rotate at an accelerated speed, the flywheel stores the energy in a kinetic energy mode, the energy storage process of converting the electric energy into mechanical energy is completed, and the energy is stored in a flywheel body rotating at a high speed; then, the motor maintains a constant rotating speed until receiving a control signal of energy release; when releasing energy, the flywheel rotating at high speed drags the motor to generate electricity, and current and voltage suitable for loads are output through the power converter, so that the process of releasing energy from mechanical energy to electric energy conversion is completed. The whole flywheel energy storage device can realize the processes of inputting, storing and outputting electric energy.
In one embodiment, the chemical energy storage of the present application employs electrochemical energy storage. Electrochemical energy storage refers to energy storage of various secondary batteries, and currently, lithium batteries and lead storage batteries are mainly used. The discharge rate of the battery for electrochemical energy storage is small, and the battery can be used as an energy storage system; the flywheel has large discharge multiplying power for energy storage, and can be used as a power type energy storage system. Fig. 2 is a schematic diagram showing the coordination of flywheel energy storage and electrochemical energy storage with frequency modulation. The discharge rate is the ratio of power to capacity, the maximum discharge rate of the electrochemical energy storage mode can reach 1C, and the discharge rate of the flywheel energy storage mode can reach 2C-4C. It is understood that in other embodiments, the energy storage frequency modulation method may also use other types of energy storage devices to perform energy storage. In this embodiment, if the obtained comparison result is that a short-time large-rate charge and discharge is required, a flywheel is selected to store energy; and if long-time low-rate charge and discharge is required, electrochemical energy storage is selected.
In this embodiment, after the energy storage main control unit receives the output value of the unit, the energy storage mode is selected according to the comparison difference value and the preset difference value threshold value, and after the response time is compared with the preset response time, according to the comparison result.
And step S140, sending a control instruction to the corresponding energy storage device based on the energy storage mode, and controlling the corresponding energy storage device to output power.
The energy storage modes comprise a physical energy storage mode and a chemical energy storage mode, therefore, the energy storage main control unit sends a control instruction to the corresponding energy storage device according to the energy storage mode determined in the step S130 to control the corresponding energy storage device to output force, and the output value of the corresponding energy storage device is the difference value between the expected output value defined by the AGC instruction and the output value of the unit.
According to the energy storage frequency modulation method, when an AGC instruction is received, a power output value and response time of a power grid expected by a power grid dispatching center are determined, a unit power output value is obtained, a difference value between the expected power output value and the unit power output value is determined, and the difference value is used for outputting power through an energy storage device; and then, respectively comparing the difference value and the response time with a preset difference value threshold value and preset response time, determining an energy storage mode, and controlling the corresponding energy storage device to output force based on the energy storage mode. By the method, different energy storage modes can be selected according to different conditions, so that the electricity consumption cost is reduced while the frequency modulation performance of the unit is ensured.
In one embodiment, as shown in fig. 3, a schematic flow chart of an energy storage frequency modulation method in one embodiment is shown. In this embodiment, the determined energy storage mode is a chemical energy storage mode, and then a control instruction is sent to the corresponding energy storage device based on the energy storage mode, so as to control the corresponding energy storage device to output power, including: and sending a control instruction to the chemical energy storage device based on the chemical energy storage mode to control the chemical energy storage device to output force.
In one embodiment, as shown in fig. 4, a schematic flow chart of a method for frequency modulation of stored energy in another embodiment is shown. In this embodiment, the determined energy storage mode is a physical energy storage mode, and then a control instruction is sent to the corresponding energy storage device based on the energy storage mode, so as to control the corresponding energy storage device to output power, including: and sending a control instruction to the physical energy storage device based on the physical energy storage mode to control the physical energy storage device to output power.
If the physical energy storage adopts flywheel energy storage, the energy storage device corresponding to the physical energy storage is the flywheel energy storage device, so that the energy storage main control unit sends a control instruction to the flywheel energy storage device to control the flywheel energy storage to output power when the determined energy storage mode is flywheel energy storage.
Similarly, if the chemical energy storage adopts electrochemical energy storage, the energy storage device corresponding to the chemical energy storage is the electrochemical energy storage device, and therefore, when the determined energy storage mode is chemical energy storage, the energy storage main control unit sends a control instruction to the electrochemical energy storage device to control the electrochemical energy storage device to output power.
Furthermore, the energy storage main control unit sends a control instruction to the energy storage device, and after controlling the corresponding energy storage device to output power, the energy storage frequency modulation system combines the output power of the unit and the output power of the energy storage device and uploads the combined output power to the power grid as an AGC (automatic gain control) assessment basis, so that the frequency modulation performance of the unit is improved.
According to the method, multiple energy storage modes jointly participate in the AGC combined frequency modulation work of the thermal power plant, the service life of an electrochemical energy storage battery in the AGC combined frequency modulation of the thermal power plant can be prolonged while the AGC instruction is perfectly responded, and therefore the power consumption cost of the energy storage power station is reduced.
In an embodiment, as shown in fig. 5, a schematic step flow diagram of the energy storage frequency modulation method in this embodiment is shown. In the implementation, a physical energy storage device is taken as a flywheel energy storage device, a chemical energy storage device is taken as an electrochemical energy storage device as an example, and a preset difference threshold value is recorded as delta; the preset time is recorded as t.
The method comprises the steps that a power grid dispatching center sends an AGC command to a remote terminal control unit RTU of a power plant, the RTU forwards the AGC command to a distributed control unit DCS and an energy storage main control unit of the power plant, and the DCS controls unit output based on the AGC command and sends the unit output value to the energy storage main control unit.
When the energy storage main control unit receives an AGC instruction, determining an expected output value and response time according to the AGC instruction; when a unit output force value sent by a decentralized control unit is received, calculating a difference value between an expected output force value and the unit output force value; determining an energy storage mode based on a preset difference threshold value delta, a preset response time t, the difference and the response time; and sending a control instruction to the corresponding energy storage device based on the energy storage mode to control the corresponding energy storage device to output force.
Specifically, comparing the difference value with delta, and comparing the response time with t to obtain a comparison result; if the comparison result is: and if the difference is less than delta and the response time is greater than or equal to t, determining that the energy storage mode is chemical energy storage, and sending a control instruction to the electrochemical energy storage device by the energy storage main control unit to control the output of the electrochemical energy storage device.
If the comparison result is: the difference is greater than or equal to delta, and the response time is greater than or equal to t; and determining that the energy storage mode is physical energy storage, and at the moment, sending a control instruction to the flywheel energy storage device by the energy storage main control unit to control the flywheel energy storage device to output force. Or the difference is larger than or equal to delta, and the response time is smaller than t; and determining that the energy storage mode is physical energy storage, and at the moment, sending a control instruction to the flywheel energy storage device by the energy storage main control unit to control the flywheel energy storage device to output force. Or, if the difference is smaller than delta and the response time is smaller than t, the energy storage mode is determined to be physical energy storage, and at the moment, the energy storage main control unit sends a control instruction to the flywheel energy storage device to control the flywheel energy storage device to output force.
Further, if electrochemical energy storage is adopted, output signals output by the electrochemical energy storage device are converted into alternating current and direct current through an energy storage inverter PCS (power Conversion system), then energy storage boosting transformation is carried out to obtain processed output signals, the output signals output and processed by the electrochemical energy storage device and the output signals of the generator set are combined, and then the output signals pass through a main transformer of a power plant and are uploaded to a power grid.
If the flywheel energy storage is adopted, the output signal output by the flywheel energy storage device is subjected to energy storage boosting and transformation, then is combined with the output signal of the generator set, passes through a main transformer of a power plant, and then is uploaded to a power grid.
By the energy storage frequency modulation method, the flywheel energy storage system is introduced, so that the advantages of flywheel energy storage and electrochemical energy storage are fully utilized to complement each other, and the natural defect in the aspect of electrochemical energy storage operation can be overcome. The electrochemical cell has small discharge multiplying power and can be used as an energy storage system; the flywheel system has large discharge multiplying power and can be used as a power type energy storage system, the flywheel system and the power type energy storage system jointly participate in AGC (automatic gain control) combined frequency modulation work of the thermal power plant, the service life of an electrochemical energy storage battery in the AGC combined frequency modulation of the thermal power plant is prolonged while the AGC instruction is perfectly responded, and therefore the power consumption cost of an energy storage power station is reduced.
It should be understood that, although the steps in the flowcharts of fig. 1, 3 to 5 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1, 3-5 may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternatingly with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 6, there is provided an energy storage frequency modulation device, including: the system comprises an AGC instruction receiving module 610, a unit output value acquiring module 620, an energy storage mode determining module 630 and a control module 640, wherein:
an AGC instruction receiving module 610, configured to receive an AGC instruction, and determine an expected output value and response time according to the AGC instruction;
a unit output value obtaining module 620, configured to obtain a unit output value, and calculate a difference between the expected output value and the unit output value;
an energy storage mode determining module 630, configured to determine an energy storage mode based on a preset difference threshold, a preset response time, the difference, and the response time;
and the control module 640 is configured to send a control instruction to the corresponding energy storage device based on the energy storage mode, and control the corresponding energy storage device to output power.
For specific limitations of the energy storage frequency modulation device, reference may be made to the above limitations of the energy storage frequency modulation method, which will not be described herein again. All or part of each module in the energy storage frequency modulation device can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
Fig. 7 shows a schematic structural diagram of an energy storage frequency modulation system in this embodiment; the method comprises the following steps: the system comprises a remote terminal control unit, a distributed control unit, an energy storage main control unit, a generator set and an energy storage device.
When receiving an AGC instruction sent by a power grid dispatching center, a remote terminal control unit forwards the AGC instruction to a distributed control unit and an energy storage main control unit;
the distributed control unit controls the output of the generator set based on the AGC command and sends the output value of the generator set to the energy storage main control unit;
the energy storage main control unit determines an expected force output value and response time according to the AGC command; when a unit output force value sent by a decentralized control unit is received, calculating a difference value between an expected output force value and the unit output force value; determining an energy storage mode based on a preset difference threshold, preset response time, the difference and the response time; and sending a control instruction to the corresponding energy storage device based on the energy storage mode to control the corresponding energy storage device to output force.
Wherein, in one embodiment, the energy storage device comprises a physical energy storage device and a chemical energy storage device. Further, the physical energy storage device is a flywheel energy storage device, and the chemical energy storage device is an electrochemical energy storage device. And the energy storage main control unit determines whether to select flywheel energy storage or electrochemical energy storage according to the comparison result of the difference value and a preset difference value threshold value, the response time and the preset response time. The discharge rate of the electrochemical battery energy storage mode is small, the electrochemical battery energy storage mode can be used as an energy type energy storage system, and the discharge rate of flywheel energy storage is large, so that the electrochemical battery energy storage mode can be used as a power type energy storage system. Therefore, when the difference value is smaller than the preset difference value threshold value and the response time is greater than or equal to the preset response time, the energy storage main control unit determines to select electrochemical energy storage, and other comparison results select flywheel energy storage. By combining the measurer, the flywheel energy storage and the electrochemical energy storage jointly participate in the AGC combined frequency modulation work of the thermal power plant, the service life of an electrochemical energy storage battery in the AGC combined frequency modulation work of the thermal power plant is prolonged while the AGC command is perfectly responded, and therefore the power consumption cost of an energy storage power station is reduced. Fig. 8 is a schematic diagram of the operation of the energy storage frequency modulation system in one embodiment.
In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in fig. 9. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing data such as preset difference threshold values, preset response time and the like. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of energy storage frequency modulation.
Those skilled in the art will appreciate that the architecture shown in fig. 9 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
receiving an AGC instruction, and determining an expected force output value and response time according to the AGC instruction;
acquiring a unit output value, and calculating a difference value between the expected output value and the unit output value;
determining an energy storage mode based on a preset difference threshold, preset response time, the difference and the response time;
and sending a control instruction to the corresponding energy storage device based on the energy storage mode to control the corresponding energy storage device to output force.
In one embodiment, the processor, when executing the computer program, further performs the steps of: the energy storage mode includes: a physical energy storage mode and a chemical energy storage mode;
determining an energy storage mode based on a preset difference threshold, a preset response time, a difference and the response time, including:
and when the difference is smaller than a preset difference threshold value and the response time is greater than or equal to the preset response time, determining that the energy storage mode is a chemical energy storage mode.
In one embodiment, the processor, when executing the computer program, further performs the steps of: based on the energy storage mode sends control command to corresponding energy memory, and the output of control corresponding energy memory includes:
and sending a control instruction to the chemical energy storage device based on the chemical energy storage mode to control the chemical energy storage device to output force.
In one embodiment, the processor, when executing the computer program, further performs the steps of: determining an energy storage mode based on a preset difference threshold, preset response time, a difference and the response time, including: and when the difference value is greater than or equal to the preset difference value threshold value, determining that the energy storage mode is a physical energy storage mode.
In one embodiment, the processor, when executing the computer program, further performs the steps of: determining an energy storage mode based on a preset difference threshold, preset response time, a difference and the response time, including: and when the response time is less than the preset response time, determining that the energy storage mode is a physical energy storage mode.
In one embodiment, the processor, when executing the computer program, further performs the steps of: based on the energy storage mode sends control command to corresponding energy memory, and the output of control corresponding energy memory includes:
and sending a control instruction to the physical energy storage device based on the physical energy storage mode to control the physical energy storage device to output power.
In one embodiment, the processor, when executing the computer program, further performs the steps of: the physical energy storage mode comprises the following steps: and a flywheel energy storage mode.
In one embodiment, the processor, when executing the computer program, further performs the steps of: the chemical energy storage mode comprises the following steps: and (4) an electrochemical energy storage mode.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
receiving an AGC instruction, and determining an expected force output value and response time according to the AGC instruction;
acquiring a unit output value, and calculating a difference value between the expected output value and the unit output value;
determining an energy storage mode based on a preset difference threshold, preset response time, the difference and the response time;
and sending a control instruction to the corresponding energy storage device based on the energy storage mode to control the corresponding energy storage device to output force.
In one embodiment, the computer program when executed by the processor further performs the steps of: the energy storage mode includes: a physical energy storage mode and a chemical energy storage mode;
determining an energy storage mode based on a preset difference threshold, a preset response time, a difference and the response time, including:
and when the difference is smaller than a preset difference threshold value and the response time is greater than or equal to the preset response time, determining that the energy storage mode is a chemical energy storage mode.
In one embodiment, the computer program when executed by the processor further performs the steps of: based on the energy storage mode sends control command to corresponding energy memory, and the output of control corresponding energy memory includes:
and sending a control instruction to the chemical energy storage device based on the chemical energy storage mode to control the chemical energy storage device to output force.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining an energy storage mode based on a preset difference threshold, preset response time, a difference and the response time, including: and when the difference value is greater than or equal to the preset difference value threshold value, determining that the energy storage mode is a physical energy storage mode.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining an energy storage mode based on a preset difference threshold, preset response time, a difference and the response time, including: and when the response time is less than the preset response time, determining that the energy storage mode is a physical energy storage mode.
In one embodiment, the computer program when executed by the processor further performs the steps of: based on the energy storage mode sends control command to corresponding energy memory, and the output of control corresponding energy memory includes:
and sending a control instruction to the physical energy storage device based on the physical energy storage mode to control the physical energy storage device to output power.
In one embodiment, the computer program when executed by the processor further performs the steps of: the physical energy storage mode comprises the following steps: and a flywheel energy storage mode.
In one embodiment, the computer program when executed by the processor further performs the steps of: the chemical energy storage mode comprises the following steps: and (4) an electrochemical energy storage mode.
When the energy storage main control unit receives an AGC instruction, the energy storage frequency modulation device, the computer equipment, the storage medium and the energy storage frequency modulation system determine a power output value and response time of a power grid expected by a power grid dispatching center, acquire a unit power output value, determine a difference value between the expected power output value and the unit power output value, and output power by the energy storage device; and then, respectively comparing the difference value and the response time with a preset difference value threshold value and preset response time, determining an energy storage mode, and controlling the corresponding energy storage device to output force based on the energy storage mode. By the method, different energy storage modes can be selected according to different conditions, so that the electricity consumption cost is reduced while the frequency modulation performance of the unit is ensured.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of energy storage frequency modulation, the method comprising:
receiving an AGC instruction, and determining an expected force output value and response time according to the AGC instruction;
acquiring a unit output value, and calculating a difference value between the expected output value and the unit output value;
determining an energy storage mode based on a preset difference threshold, a preset response time, the difference and the response time; the energy storage mode comprises the following steps: a physical energy storage mode and a chemical energy storage mode;
sending a control instruction to the corresponding energy storage device based on the energy storage mode, and controlling the corresponding energy storage device to output force;
the determining an energy storage mode based on a preset difference threshold, a preset response time, the difference and the response time comprises:
and when the difference is smaller than the preset difference threshold and the response time is larger than or equal to the preset response time, determining that the energy storage mode is a chemical energy storage mode.
2. The method according to claim 1, wherein the sending a control command to the corresponding energy storage device based on the energy storage manner to control the corresponding energy storage device to output power comprises:
and sending a control instruction to a chemical energy storage device based on the chemical energy storage mode to control the chemical energy storage device to output power.
3. The method of claim 1, wherein determining an energy storage mode based on a preset difference threshold, a preset response time, the difference, and the response time comprises:
when the difference is larger than or equal to the preset difference threshold, determining that the energy storage mode is a physical energy storage mode;
or when the response time is less than the preset response time, determining that the energy storage mode is a physical energy storage mode.
4. The method according to claim 3, wherein the sending a control command to the corresponding energy storage device based on the energy storage manner to control the corresponding energy storage device to output power comprises:
and sending a control instruction to a physical energy storage device based on the physical energy storage mode to control the physical energy storage device to output power.
5. The method of any one of claims 1 to 4, comprising at least one of:
the physical energy storage mode comprises the following steps: a flywheel energy storage mode;
the chemical energy storage mode comprises the following steps: and (4) an electrochemical energy storage mode.
6. The method according to claim 5, wherein the discharge rate of the electrochemical energy storage mode is 1C, and the discharge rate of the flywheel energy storage mode comprises 2C-4C; the discharge rate is the ratio of power to capacity.
7. An energy storage frequency modulation device, the device comprising:
the AGC instruction receiving module is used for receiving an AGC instruction and determining an expected force output value and response time according to the AGC instruction;
the unit output value acquisition module is used for acquiring a unit output value and calculating a difference value between the expected output value and the unit output value;
the energy storage mode determining module is used for determining an energy storage mode based on a preset difference threshold, preset response time, the difference and the response time; the energy storage mode comprises the following steps: a physical energy storage mode and a chemical energy storage mode;
the control module is used for sending a control instruction to the corresponding energy storage device based on the energy storage mode and controlling the corresponding energy storage device to output force;
the energy storage mode determining module is specifically configured to determine that the energy storage mode is a chemical energy storage mode when the difference is smaller than the preset difference threshold and the response time is greater than or equal to the preset response time.
8. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 6 when executing the computer program.
9. An energy storage frequency modulation system, the system comprising: the system comprises a remote terminal control unit, a distributed control unit, an energy storage main control unit, a generator set and an energy storage device;
the remote terminal control unit forwards the AGC command to the distributed control unit and the energy storage main control unit when receiving the AGC command sent by a power grid dispatching center;
the distributed control unit controls the generator set to output based on the AGC command and sends the generator set output value of the generator set to the energy storage main control unit;
the energy storage main control unit determines an expected force output value and response time according to the AGC command; when a unit output force value sent by the decentralized control unit is received, calculating a difference value between the expected output force value and the unit output force value; determining an energy storage mode based on a preset difference threshold, a preset response time, the difference and the response time; sending a control instruction to the corresponding energy storage device based on the energy storage mode, and controlling the corresponding energy storage device to output force; the energy storage mode comprises the following steps: a physical energy storage mode and a chemical energy storage mode;
and when the difference value is smaller than the preset difference value threshold value and the response time is greater than or equal to the preset response time, the energy storage main control unit determines that the energy storage mode is a chemical energy storage mode.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 6.
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