CN114421505B

CN114421505B - Control method and device based on flywheel energy storage system and electronic equipment

Info

Publication number: CN114421505B
Application number: CN202210191081.2A
Authority: CN
Inventors: 梁志宏; 季明彬; 苏森; 张文慎; 黄漪帅; 张峰; 梁清鹤; 武全伟; 蔡晓科; 刘然
Original assignee: Guoneng Ningxia Lingwu Power Generation Co ltd; Huachi Kinetic Energy Beijing Technology Co ltd
Current assignee: Guoneng Ningxia Lingwu Power Generation Co ltd; Huachi Kinetic Energy Beijing Technology Co ltd
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2022-10-11
Anticipated expiration: 2042-03-01
Also published as: CN114421505A

Abstract

The present disclosure provides a control method, device and electronic device based on a flywheel energy storage system, where the flywheel energy storage system includes: an energy storing flywheel array, the energy storing flywheel array comprising: the energy storage device comprises a plurality of energy storage flywheels and a charging and discharging current transformer electrically connected with the energy storage flywheels, wherein the method comprises the following steps: determining a target mode of an energy storage flywheel array; controlling the charging and discharging current transformer to detect the rotating speed of the corresponding energy storage flywheel; the target mode where the energy storage flywheel array is located and the rotating speed of the energy storage flywheel can be combined, the individual control of each energy storage flywheel in the flywheel energy storage system is achieved, the flexibility of the control process can be effectively improved, diversified application scenes can be adapted, and the control effect of the energy storage flywheel can be effectively improved.

Description

Control method and device based on flywheel energy storage system and electronic equipment

Technical Field

The disclosure relates to the technical field of electric power, in particular to a control method and device based on a flywheel energy storage system and electronic equipment.

Background

With the rapid development of new energy technology, in order to improve the utilization efficiency of new energy, improve the stability of a power grid and promote the high-quality development of energy, the power frequency modulation technology of energy storage is greatly supported. The existing energy storage frequency modulation of the chemical battery can not meet the system requirement of high-power high-frequency charge and discharge in the field of frequency modulation of a power system. The thermal power generating unit frequency modulation has the advantages of low response speed, low climbing speed and difficult meeting of the requirements on frequency modulation quality and flexibility.

In the related art, a technical scheme of fire and storage combined frequency modulation is generally adopted. Fire-storage combined frequency modulation requires that a plurality of energy storage flywheels are connected in parallel to form an energy storage flywheel array, each energy storage flywheel is a large-inertia high-speed rotating energy storage body, and stored energy is expressed by the linear speed of a rotating shaft which is connected with the energy storage body into a whole. Due to the difference between the time accumulated error and the single power consumption, the stored energy of each energy storage flywheel is slightly different in the charging and discharging process, or one energy storage flywheel in the energy storage flywheel array is in a fault shutdown state, so that the energy storage flywheel array cannot normally work as a whole.

In this way, frequent charging and discharging in actual conditions may cause the power storage states of each energy storage flywheel to be inconsistent, and it is obviously unreasonable to distribute the power evenly, which may affect the dynamic performance of the flywheel energy storage system.

Disclosure of Invention

The present disclosure is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, the present disclosure aims to provide a flywheel energy storage system-based control method, a flywheel energy storage system-based control device, a flywheel energy storage system, an electronic device, a storage medium, and a computer program product, so as to realize the personalized control of each energy storage flywheel in the flywheel energy storage system by combining the target mode of the energy storage flywheel array and the rotation speed of the energy storage flywheel, effectively improve the flexibility of the control process, adapt to diversified application scenarios, and effectively improve the control effect of the energy storage flywheel.

In an embodiment of the first aspect of the present disclosure, a control method based on a flywheel energy storage system is provided, where the flywheel energy storage system includes: an energy storage flywheel array, the energy storage flywheel array comprising: the energy storage device comprises a plurality of energy storage flywheels and a charging and discharging current transformer electrically connected with the energy storage flywheels, wherein the method comprises the following steps: and determining a target mode of the energy storage flywheel array, controlling the charging and discharging current transformer to detect the rotating speed of the corresponding energy storage flywheel, and performing target control on the energy storage flywheel by combining a plurality of rotating speeds according to the target mode.

According to the control method based on the flywheel energy storage system provided by the embodiment of the first aspect of the disclosure, the target mode where the energy storage flywheel array is located is determined, the charging and discharging converter is controlled to detect the rotating speed of the corresponding energy storage flywheel, and then the target mode is combined with a plurality of rotating speeds according to the target mode to perform target control on the energy storage flywheel, so that the target mode where the energy storage flywheel array is located and the rotating speed of the energy storage flywheel are combined, individualized control on each energy storage flywheel in the flywheel energy storage system is realized, the flexibility of the control process can be effectively improved, diversified application scenes are adapted, and the control effect on the energy storage flywheel can be effectively improved.

The embodiment of the second aspect of the present disclosure provides a control device based on a flywheel energy storage system, where the flywheel energy storage system includes: an energy storage flywheel array, the energy storage flywheel array comprising: a plurality of energy storage flywheels to and the charge-discharge converter of being connected with the energy storage flywheel electricity, the device includes: the determining module is used for determining a target mode of the energy storage flywheel array; the first control module is used for controlling the charging and discharging current transformer to detect the rotating speed of the corresponding energy storage flywheel; and the second control module is used for performing target control on the energy storage flywheel by combining a plurality of rotating speeds according to the target mode.

The control device based on flywheel energy storage system that this disclosed second aspect embodiment provided, through confirming the target mode that energy storage flywheel array is located, control charge-discharge converter detects the rotational speed of corresponding energy storage flywheel, and then unite a plurality of rotational speeds according to the target mode, carry out the target control to the energy storage flywheel, therefore, realize combining the target mode that energy storage flywheel array is located and the rotational speed of energy storage flywheel, realize the individualized control to each energy storage flywheel in the flywheel energy storage system, can effectively promote the flexibility of this control process, the diversified application scene of adaptation, can effectively promote the control effect to the energy storage flywheel.

In an embodiment of the third aspect of the present disclosure, a flywheel energy storage system includes: an energy storage flywheel array; the energy storage flywheel array comprises: a plurality of energy storage flywheels; the charging and discharging current transformer is electrically connected with the energy storage flywheel; and the control device based on the flywheel energy storage system is provided as the embodiment of the second aspect.

An embodiment of a fourth aspect of the present disclosure provides an electronic device, including: the control method comprises the following steps of storing a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the control method based on the flywheel energy storage system according to the embodiment of the first aspect of the disclosure.

A fifth aspect of the present disclosure provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the flywheel-based energy storage system control method as set forth in the first aspect of the present disclosure.

An embodiment of a sixth aspect of the present disclosure provides a computer program product, which when being executed by an instruction processor, executes a control method based on a flywheel energy storage system as set forth in an embodiment of the first aspect of the present disclosure.

Additional aspects and advantages of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure.

Drawings

The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic flowchart of a control method based on a flywheel energy storage system according to an embodiment of the present disclosure;

FIG. 2 is a schematic flow chart diagram of a flywheel-based energy storage system control method according to another embodiment of the present disclosure;

FIG. 3 is a schematic flow chart diagram of a flywheel-based energy storage system control method according to another embodiment of the present disclosure;

FIG. 4 is a schematic flow chart diagram of a flywheel-based energy storage system control method according to another embodiment of the present disclosure;

FIG. 5 is a schematic flow chart diagram of a flywheel-based energy storage system control method according to another embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a control device based on a flywheel energy storage system according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a control device based on a flywheel energy storage system according to another embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a flywheel energy storage system according to an embodiment of the present disclosure;

FIG. 9 illustrates a block diagram of an exemplary electronic device suitable for use in implementing embodiments of the present disclosure.

Detailed Description

Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present disclosure, and are not to be construed as limiting the present disclosure. Rather, the embodiments of the disclosure include all changes, modifications and equivalents coming within the spirit and terms of the claims appended thereto.

Fig. 1 is a schematic flowchart of a control method based on a flywheel energy storage system according to an embodiment of the present disclosure.

It should be noted that an execution main body of the control method based on the flywheel energy storage system according to this embodiment may be a control device based on the flywheel energy storage system, where the device may be implemented in a software and/or hardware manner, and the device may be configured in an electronic device, or may also be configured in the flywheel energy storage system, and the electronic device may include, but is not limited to, a terminal, a server, and the like.

As shown in fig. 1, the control method based on the flywheel energy storage system includes:

s101: and determining the target mode of the energy storage flywheel array.

The flywheel energy storage refers to an energy storage mode that an energy storage flywheel is driven by a motor to rotate at a high speed and then drives a generator to generate electricity when needed.

The energy storage flywheel is a core component in the flywheel energy storage system, and is used for improving the limit angular speed of the rotor, reducing the weight of the rotor, and increasing the energy storage capacity of the flywheel energy storage system to the maximum extent.

The energy storage flywheel array includes a plurality of energy storage flywheels (the energy storage flywheel may be a magnetic suspension energy storage flywheel) configured in advance according to an application scenario in the embodiment of the present disclosure, and a charging and discharging converter electrically connected to the energy storage flywheel, and of course, the energy storage flywheel array may further include any other possible device, which is not limited to this.

For example, the energy storage flywheel array in the embodiment of the present disclosure may include an energy storage flywheel, a charging and discharging converter electrically connected to the energy storage flywheel, an energy storage converter (Power Conversion System, PCS), a grid connection switch, a bus using ethernet Control Automation Technology (EtherCAT), and a common ac bus.

The capacity and the power of the energy storage flywheel array depend on the number of the energy storage flywheels connected in parallel. The energy storage flywheel is connected with the charge-discharge converter, the charge-discharge converter is connected with the PCS, the PCS is connected with the grid-connected switch, and the grid-connected switch is connected with the public alternating current bus. The control mode of the energy storage flywheel array system adopts the control mode of the same level, each charging and discharging converter in the array is connected through an EtherCAT bus, and other charging and discharging converters in the energy storage flywheel array are broadcasted through the EtherCAT bus, so that the state of the whole energy storage flywheel array system is diagnosed. And performing charging and discharging actions, vacuum system control actions, environmental system control actions and the like according to the total scheduling command.

The target mode refers to an operating state of the energy storage flywheel array, and the target mode may be a charging mode, a discharging mode, a standby mode, and the like, which is not limited herein.

It can be understood that when the energy storage flywheel arrays are in different working states, working contents of the plurality of energy storage flywheels may be different, and therefore, in the embodiment of the present disclosure, by determining the target mode in which the energy storage flywheel array is located, a subsequent step may be triggered to determine to perform target control on the energy storage flywheel in combination with the target mode, so that the control process can be adapted to diversified working modes of the energy storage flywheel arrays.

S102: and controlling the charging and discharging current transformer to detect the rotating speed of the corresponding energy storage flywheel.

The charging and discharging converter is an electrical device which changes the voltage, frequency, phase number and other electric quantities or characteristics of the energy storage flywheel in the charging and discharging processes of the energy storage flywheel.

For example, the charging and discharging converter can be developed based on a fully programmable system-on-chip platform, has the characteristics of high performance and low power consumption due to the adoption of a structure of a dual-core processor, can be embedded into a real-time operating system, saves the resources of a control system to the maximum extent, and can integrate the functions of charging and discharging control logic and control strategy of an energy storage flywheel, bearing control logic and control strategy, integral scheduling and protection logic of a main control system and the like in the charging and discharging converter. The cooperative control of the power of the energy storage flywheel array can also be realized on a charge-discharge converter corresponding to the energy storage flywheel, the charge-discharge converter can judge the self electric quantity and other energy storage flywheel conditions, adjust the control strategy in real time, reasonably distribute the power and realize the optimization of the dynamic performance of the whole energy storage flywheel array, and certainly, the embodiment of the disclosure can also adopt any other possible platform to develop the charge-discharge converter, and the limitation is not required.

It can be understood that, in an ideal state, the rotation speeds of the plurality of energy storage flywheels in the energy storage flywheel array at the same time point are consistent, but due to possible differences of characteristics, power consumption, the spatial environment and the like among the energy storage flywheels, after accumulation of a period of time, the rotation speeds of the energy storage flywheels at the same time point may be different.

S103: and performing target control on the energy storage flywheel by combining a plurality of rotating speeds according to the target mode.

The target control refers to a plurality of corresponding control processes for the energy storage flywheel, which are configured in advance according to a plurality of possible application scenarios of the energy storage flywheel.

In some embodiments, the target control of the energy storage flywheel is performed by combining a plurality of rotation speeds according to the target mode, where the target mode and a plurality of rotation speed data are input into a pre-trained target control model (the target control model may be obtained in advance based on an artificial training method), and the target control of the energy storage flywheel is realized by the target control model, or according to a pre-configured relationship table, a target control method corresponding to a plurality of rotation speeds in the target mode may be recorded in the relationship table, and the target control of the energy storage flywheel is realized based on the target control method.

It can be understood that the control method based on the flywheel energy storage system can be applied to the flywheel energy storage system, for example, the flywheel energy storage system can include: the intelligent energy storage system comprises a 6MW photovoltaic power generation system, 2 660MW coal-fired units, a 22.68MW energy storage flywheel array, an intelligent coupling control system, a digital twin optimization control system and the like, and certainly, the flywheel-based energy storage system can also be composed of any other possible equipment, and the limitation is not made.

In this embodiment, through confirming the target mode that the energy storage flywheel array is located, control the rotational speed that charge-discharge converter detected corresponding energy storage flywheel, then unite a plurality of rotational speeds according to the target mode, carry out the target control to the energy storage flywheel, therefore, realize combining the target mode that the energy storage flywheel array is located and the rotational speed of energy storage flywheel, realize the individualized control to each energy storage flywheel in the flywheel energy storage system, can effectively promote the flexibility of this control process, the diversified application scene of adaptation can effectively promote the control effect to the energy storage flywheel.

Fig. 2 is a schematic flow chart of a control method based on a flywheel energy storage system according to another embodiment of the disclosure.

As shown in fig. 2, the control method based on the flywheel energy storage system includes:

s201: and determining the target mode of the energy storage flywheel array.

S202: and controlling the charging and discharging current transformer to detect the rotating speed of the corresponding energy storage flywheel.

For the description of S201 and S202, reference may be made to the above embodiments, which are not described herein again.

S203: and determining the current electric quantity of the corresponding energy storage flywheel according to the rotating speed.

The current electric quantity refers to the electric quantity value stored by the energy storage flywheel at the current time point.

It can be understood that each energy storage flywheel is a large inertia high-speed rotation energy storage body, and the amount of stored electric quantity can be represented by the linear speed of the rotating shaft connected with the energy storage body into a whole, so that in the embodiment of the disclosure, the current electric quantity of the corresponding energy storage flywheel can be determined according to the rotating speed.

For example, after the charging and discharging current transformer is controlled to detect the rotation speed of the corresponding energy storage flywheel, the current electric quantity of the corresponding energy storage flywheel is determined according to the rotation speed, and the following formula can be adopted:

where ω is a rotation speed of the energy storage flywheel at a current time point, E is a current electric quantity, J is a rotational inertia of the energy storage flywheel, P is a power of the energy storage flywheel within a time period T, and T is a time point after the zero time.

S204: and determining the comparison result of the current electric quantities of different energy storage flywheels.

The comparison result refers to an analysis result obtained by analyzing and comparing the current electric quantities of different energy storage flywheels. For example, the average value of the current electric quantities of different energy storage flywheels may be obtained, then the average value is used to perform difference processing on the current electric quantities of different energy storage flywheels, and a plurality of obtained difference values are used as the comparison result, or a mathematical method may be used to obtain a ratio of the current electric quantities of different energy storage flywheels, and the ratio is used as the comparison result of the current electric quantities of different energy storage flywheels, which is not limited to this.

S205: and performing target control on the energy storage flywheel according to the target mode combined comparison result.

It can be understood that the comparison result can represent the state difference between the energy storage flywheels in the energy storage flywheel array at the current time point, and the state difference can affect the working performance and the service life of the energy storage flywheel array.

In some embodiments, the target control may be performed on the energy storage flywheel according to the target mode combined comparison result, the target mode and the comparison result may be input into a third-party control device, and the third-party control device performs the target control on the energy storage flywheel according to data of the input end, or alternatively, an engineering method may be adopted to perform the target control on the energy storage flywheel according to the target mode combined comparison result, and of course, any other possible method may be adopted to perform the target control on the energy storage flywheel according to the target mode combined comparison result, which is not limited.

That is to say, after the charging and discharging current transformer is controlled to detect the rotating speed of the corresponding energy storage flywheel, the current electric quantity of the corresponding energy storage flywheel can be determined according to the rotating speed, the comparison result of the current electric quantities of different energy storage flywheels is determined, then the energy storage flywheel is subjected to target control according to the target mode combined comparison result, therefore, the possible state difference between the energy storage flywheels can be determined in the target mode, then the energy storage flywheels are accurately controlled according to the state difference, and the rationality and the applicability of the control method based on the flywheel energy storage system can be effectively improved.

S206: and if the energy storage flywheel array receives the power absorption instruction, storing the power provided by the photovoltaic power generation subsystem.

The absorption power refers to that the energy storage flywheel array acquires and stores electric energy from a third-party electric energy supply device according to an absorption power instruction. And the absorption power instruction is an instruction which acts on the energy storage flywheel array and is used for instructing the energy storage flywheel array to perform absorption power operation. In the embodiment of the present disclosure, the absorbed power instruction may be configured by a user according to an application scenario and transmitted to the energy storage flywheel array, or a threshold condition of the absorbed power may be configured in the flywheel-based energy storage system in advance, and the absorbed power instruction is generated and transmitted to the energy storage flywheel array when the comparison result meets the threshold condition, which is not limited to this.

The photovoltaic power generation subsystem is a power generation system which directly converts solar radiation energy into electric energy by utilizing the photovoltaic effect of a photovoltaic cell. Of course, in the embodiment of the present disclosure, after the energy storage flywheel array receives the absorbed power instruction, the power provided by the wind power generation system, the tidal power generation system, and the like may also be stored, which is not limited thereto.

It can be understood that the power provided by the photovoltaic power generation subsystem belongs to clean energy, and therefore, the power provided by the photovoltaic power generation subsystem is stored after the energy storage flywheel array receives the power absorption instruction, the energy supply structure of the energy storage flywheel array can be optimized, and the carbon emission generated by the flywheel energy storage system in the working process is effectively reduced.

S207: and determining whether the power provided by the photovoltaic power generation subsystem reaches the target power, and if not, storing the power provided by the generator outlet of the thermal power generating unit.

The thermal power unit is equipment for generating power by using power provided by a thermal power generator.

It can be understood that, because the power value that photovoltaic power generation subsystem can provide can receive the influence of many aspects factors such as time, weather, geographical position, it can not satisfy the power demand of this energy storage flywheel array in some application scenarios to rely on photovoltaic power generation subsystem alone, consequently, can be when confirming that the power that photovoltaic power generation subsystem provided does not reach the target power, the power that the generator export of storage thermal power unit provided, therefore, can avoid the power that photovoltaic power generation subsystem provided not enough and influence the working property of energy storage flywheel, can effectively promote the robustness of this energy storage flywheel working property.

S208: and if the energy storage flywheel array does not receive the frequency modulation instruction, absorbing power from the photovoltaic power generation subsystem to keep a dynamic floating charge state.

The frequency modulation means that when the energy storage flywheel array receives a frequency modulation instruction, the auxiliary thermal generator set responds to the frequency modulation instruction to realize instruction tracking and provide active power compensation to achieve the purpose of stabilizing the frequency. The frequency modulation instruction is an instruction which acts on the energy storage flywheel array and is used for indicating the energy storage flywheel array to absorb power from the photovoltaic power generation subsystem so as to keep a dynamic floating state.

The system connects the electric storage equipment and the power line in parallel to a load circuit, the voltage of the electric storage equipment is substantially constant and is only slightly higher than the terminal voltage of the electric storage equipment, and the loss of the electric storage equipment in local action is compensated by a small amount of current supplied by the power line, so that the electric storage equipment can be always kept in a charging satisfaction state without overcharging. And the dynamic floating charge state means that the energy storage flywheel array absorbs power from the photovoltaic power generation subsystem when not receiving the frequency modulation command so as to supplement the self maintenance loss and keep the self electric storage quantity dynamic balance.

Therefore, when the energy storage flywheel array does not receive the frequency modulation instruction, the photovoltaic power generation subsystem absorbs power to keep a dynamic floating charge state, and the stability of the working performance of the energy storage flywheel array can be effectively improved.

S209: and if the energy storage flywheel array receives a power release instruction, the combined thermal power generating unit responds to the frequency modulation instruction and provides active power compensation for the power grid side equipment so that the power grid side equipment meets a stable frequency target.

The power release means that the thermal power generating unit is combined to release the electric energy stored by the thermal power generating unit in response to the frequency modulation command after the energy storage flywheel array receives the power release command, and active power compensation is provided for the equipment on the power grid side. And the power release instruction is an instruction which acts on the energy storage flywheel array and is used for instructing the energy storage flywheel array combined thermal power generating unit to respond to the frequency modulation instruction and provide active power compensation for the power grid side equipment so that the power grid side equipment meets a stable frequency target.

The grid-side device is a device on the power supply side in the power transmission system.

The active power refers to power, in the output power of the power grid, used for converting electric energy into energy (such as mechanical energy, thermal energy, chemical energy or sound energy) required by the user-side equipment.

Therefore, when the energy storage flywheel array receives a power release instruction, the combined thermal power generating unit responds to the frequency modulation instruction and provides active power compensation for the power grid side equipment, so that the power grid side equipment meets a frequency stabilization target, the frequency stability of the power grid side equipment can be effectively improved, the working performance of user side equipment is prevented from being influenced by unstable frequency, and the reliability of the control method based on the flywheel energy storage system can be effectively improved.

That is, the embodiments of the present disclosure may store the power provided by the photovoltaic power generation subsystem when the energy storage flywheel array receives the absorbed power command, when the power provided by the photovoltaic power generation subsystem does not reach the target power, storing the power provided by the generator outlet of the thermal power generating unit, when the energy storage flywheel array does not receive the frequency modulation instruction, the power is absorbed from the photovoltaic power generation subsystem to keep a dynamic floating charge state, when the energy storage flywheel array receives a power release instruction, the combined thermal power generating unit responds to the frequency modulation instruction and provides active power compensation for the power grid side equipment so that the power grid side equipment meets a stable frequency target, therefore, the energy supply structure of the energy storage flywheel array can be optimized, clean energy provided by the photovoltaic power generation subsystem is preferentially used, the carbon emission is effectively reduced, when the power provided by the photovoltaic power generation subsystem is determined not to reach the target power, the power provided by the generator outlet of the thermal power generating unit is stored, can avoid the working performance of the energy storage flywheel which is influenced by insufficient power provided by the photovoltaic power generation subsystem, can effectively improve the robustness of the working performance of the energy storage flywheel, when the energy storage flywheel array does not receive the frequency modulation instruction, the photovoltaic power generation subsystem absorbs power to keep a dynamic floating charge state, the stability of the working performance of the energy storage flywheel array can be effectively improved, when the energy storage flywheel array receives a power release instruction, the combined thermal power generating unit responds to the frequency modulation instruction and provides active power compensation for the power grid side equipment so that the power grid side equipment meets a stable frequency target, the stability of the frequency of the equipment on the power grid side can be effectively improved, the working performance of the equipment on the user side is prevented from being influenced by the unstable frequency, and the reliability of the control method based on the flywheel energy storage system can be effectively improved.

For example, assume that the flywheel-based energy storage system in the embodiment of the present disclosure is composed of an energy storage flywheel, a charging and discharging converter, a PCS, a grid connection switch, an EtherCAT bus, a public alternating current bus, and the like; the energy storage flywheel is connected with the PCS through a charge-discharge converter; the PCS is connected to a public alternating current bus through a grid-connected switch, a plurality of energy storage flywheels are connected to the public alternating current bus in parallel in an energy storage flywheel array, and each charging and discharging converter is connected through an EtherCAT bus in a communication network of the energy storage flywheel array. Each charging and discharging current transformer can simultaneously receive the instruction issued by the superior system through the EtherCAT bus, and the charging and discharging current transformer of each energy storage flywheel can automatically detect the health state of the system and automatically suspend after being electrified. After each charging and discharging converter receives a charging and discharging command of a superior system through an EtherCAT bus, the overall condition of the current energy storage flywheel array is judged according to diagnosis of a system level, the judged state includes but is not limited to the energy storage capacity of each energy storage flywheel, the state of a charging and discharging control system, the state of a bearing, the state of a vacuum system, the state of environment temperature and humidity, the state of an alternating current/direct current bus, the state of a grid-connected switch, the state of a PCS system and the like, and then the energy storage flywheel array can realize charging and discharging control according to a previous charging and discharging command or realize automatic charging and discharging control through detecting the voltage of a bus under the condition of meeting the above states.

In this embodiment, after the control charging and discharging converter detects the rotational speed of the corresponding energy storage flywheel, according to the rotational speed, determine the current electric quantity of the corresponding energy storage flywheel, determine the comparison result of the current electric quantities of different energy storage flywheels, and then jointly compare the result according to the target mode, carry out the target control to the energy storage flywheel, therefore, can confirm the state difference that probably exists between each energy storage flywheel in the target mode, and then realize the accurate control to each energy storage flywheel according to this state difference, can effectively promote this control method based on flywheel energy storage system's rationality and suitability. When the energy storage flywheel array receives an absorption power instruction, the power provided by the photovoltaic power generation subsystem is stored, when the energy storage flywheel array does not receive a frequency modulation instruction, the power is absorbed from the photovoltaic power generation subsystem to keep a dynamic floating charge state, the energy supply structure of the energy storage flywheel array can be optimized, clean energy provided by the photovoltaic power generation subsystem is preferentially used, carbon emission is effectively reduced, when the power provided by the photovoltaic power generation subsystem does not reach a target power, the power provided by a generator outlet of the thermal power generating unit is stored, the situation that the working performance of the energy storage flywheel is affected due to insufficient power provided by the photovoltaic power generation subsystem can be avoided, the robustness of the working performance of the energy storage flywheel can be effectively improved, when the energy storage flywheel array does not receive the frequency modulation instruction, the photovoltaic power generation subsystem absorbs the power to keep the dynamic floating charge state, the stability of the working performance of the energy storage flywheel array can be effectively improved, when the energy storage flywheel array receives a power release instruction, the combined unit responds to the frequency modulation instruction to provide active power compensation for the power grid side equipment, the power grid side equipment meets a stable frequency target, the stability of the grid side equipment can be effectively improved, the working performance of the user side equipment is prevented from being unstable, and the reliability of the thermal power storage flywheel array can be effectively improved based on the control method.

Fig. 3 is a schematic flow chart of a control method based on a flywheel energy storage system according to another embodiment of the present disclosure.

As shown in fig. 3, the control method based on the flywheel energy storage system includes:

s301: and determining the target mode of the energy storage flywheel array.

S302: and controlling the charging and discharging current transformer to detect the rotating speed of the corresponding energy storage flywheel.

S303: and determining the current electric quantity of the corresponding energy storage flywheel according to the rotating speed.

S304: and determining the comparison result of the current electric quantities of different energy storage flywheels.

For the description of S301 to S304, reference may be made to the above embodiments, which are not described herein again.

S305: and if the energy storage flywheel arrays are in a charging mode and the comparison result shows that the current electric quantities of different energy storage flywheels are the same, adjusting the energy storage flywheels to the rated rotating speed.

The charging mode refers to a working mode in which the energy storage flywheel array absorbs electric energy from third-party power supply equipment and stores the electric energy. For example, the energy storage flywheel array may enter a charging mode when receiving a charging command issued by an upper-level system or detecting that the bus voltage is higher than a charging threshold.

The rated rotating speed is the rotating speed of each energy storage flywheel which is configured according to the application scene in advance and is kept in the full-power state.

It can be understood that, when the energy storage flywheel array is in the charging mode, and the comparison result shows that the current electric quantities of different energy storage flywheels are the same, the working states of the energy storage flywheels in the energy storage flywheel array are represented to be consistent, that is, the current working performance of the energy storage flywheel array is good, and at this time, the energy storage flywheels are adjusted to the rated rotation speed, so that the electric storage performance of the energy storage flywheel array can be fully exerted.

S306: and if the energy storage flywheel array is in a charging mode and the comparison result shows that the current electric quantity of part of the energy storage flywheels is different, equalizing the current electric quantities of different energy storage flywheels until the current electric quantities of different energy storage flywheels are the same.

The equalization processing means that when the current electric quantities of the partial energy storage flywheels are different, the electric quantities of the energy storage flywheels are adjusted to achieve the purpose that the current electric quantities of the different energy storage flywheels are the same.

In some embodiments, when the energy storage flywheel array is in the charging mode and the comparison result shows that the current electric quantities of the partial energy storage flywheels are different, the current electric quantities of the different energy storage flywheels may be equalized first until the current electric quantities of the different energy storage flywheels are the same, and then the energy storage flywheels are adjusted to the rated rotation speed, or the energy storage flywheel may be adjusted to the rated rotation speed first, and then the current electric quantities of the different energy storage flywheels are equalized according to the rated rotation speed until the current electric quantities of the different energy storage flywheels are the same, which is not limited.

Optionally, in some embodiments, the current electric quantities of different energy storage flywheels are subjected to equalization processing, and the current electric quantities of the energy storage flywheels are adjusted to a rated rotation speed, so that a logic delay brought into the control method based on the flywheel energy storage system by the equalization processing process can be effectively avoided, and the execution efficiency of the control method based on the flywheel energy storage system can be effectively improved.

That is to say, this disclosed embodiment is when the energy storage flywheel array is in the charging mode, if the comparison result is that the current electric quantity of different energy storage flywheels is the same, then adjust each energy storage flywheel to rated revolution, if the comparison result is that the current electric quantity of part energy storage flywheel is inequality, then carry out balanced processing to the current electric quantity of different energy storage flywheels, until the current electric quantity of different energy storage flywheels is the same, therefore, can realize the power that every energy storage flywheel shares rationally in the charging mode, can in time make the adjustment through the algorithm according to the application scene simultaneously, guarantee the equilibrium of every energy storage flywheel electric quantity of energy storage flywheel array, make each energy storage flywheel reach ideal configuration, can effectively promote the working property of each energy storage flywheel.

For example, when the energy storage flywheel array is in the charging mode, if the current rotating speed of each energy storage flywheel is the same, that is, the current electric quantity of each energy storage flywheel is the same, the charging and discharging converter of each energy storage flywheel can charge the energy storage flywheel to the rated rotating speed according to the rated power, that is, to the full-charge state. If the difference of the current rotating speeds of the energy storage flywheels is detected, the current electric quantity of the energy storage flywheels is different, at the moment, the system can distribute the charging power to each energy storage flywheel in a weighting mode according to the actual electric quantity of each energy storage flywheel, so that the electric quantity of each energy storage flywheel is rapidly balanced, and the energy storage flywheels are synchronously accelerated to the rated rotating speed to finish charging.

In this embodiment, through when the energy storage flywheel array is in the mode of charging, if the comparison result is that the current electric quantity of different energy storage flywheels is the same, adjust each energy storage flywheel to rated revolution, if the comparison result is that the current electric quantity of partial energy storage flywheel is inequality, then carry out equalization processing to the current electric quantity of different energy storage flywheels, until the current electric quantity of different energy storage flywheels is the same, therefore, can realize the power that every energy storage flywheel of rational distribution shares in the mode of charging, can in time make the adjustment according to the algorithm of using the scene simultaneously, guarantee the equilibrium of every flywheel electric quantity of energy storage flywheel array, make each energy storage flywheel reach ideal configuration, can effectively promote the working property of each energy storage flywheel. When the comparison result shows that the current electric quantity of part of the energy storage flywheels is different, the current electric quantity of the energy storage flywheels is subjected to equalization processing, and meanwhile, the energy storage flywheels are adjusted to the rated rotating speed, so that the condition that the logic time delay is brought into the control method based on the flywheel energy storage system in the equalization processing process can be effectively avoided, and the execution efficiency of the control method based on the flywheel energy storage system can be effectively improved.

Fig. 4 is a schematic flow chart of a control method based on a flywheel energy storage system according to another embodiment of the present disclosure.

As shown in fig. 4, the control method based on the flywheel energy storage system includes:

s401: and determining the target mode of the energy storage flywheel array.

S402: and controlling the charging and discharging current transformer to detect the rotating speed of the corresponding energy storage flywheel.

S403: and determining the current electric quantity of the corresponding energy storage flywheel according to the rotating speed.

S404: and determining the comparison result of the current electric quantities of different energy storage flywheels.

For the description of S401 to S404, reference may be made to the above embodiments, which are not described herein again.

S405: and if the energy storage flywheel arrays are in a discharging mode and the comparison result shows that the current electric quantities of different energy storage flywheels are the same, performing discharging control on the energy storage flywheels based on the same power.

The discharging mode refers to an operating mode in which the energy storage flywheel array releases electric energy stored in the energy storage flywheel array and provides energy for third-party equipment.

For example, in the embodiment of the present disclosure, the energy storage flywheel array may enter the discharging mode when receiving a discharging command issued by an upper-level system or detecting that a bus voltage is lower than a discharging threshold.

The discharge control means controlling the energy storage flywheel array to release the stored electric quantity according to a pre-configured power index.

It can be understood that, when the energy storage flywheel array is in the discharging mode, and the comparison result shows that the current electric quantities of different energy storage flywheels are the same, the working states of the energy storage flywheels in the energy storage flywheel array are represented to be consistent, that is, the current working performance of the energy storage flywheel array is good, and at this time, the discharging control is performed on each energy storage flywheel based on the same power, so that the discharging performance of the energy storage flywheel array can be fully exerted.

S406: and if the energy storage flywheel array is in a discharging mode and the comparison result shows that the current electric quantity of part of the energy storage flywheels is different, determining the maximum rotating speed and the minimum rotating speed in the plurality of rotating speeds and determining the initial rotating speed difference between the maximum rotating speed and the minimum rotating speed.

The maximum rotation speed is the maximum of the obtained rotation speeds, and the minimum rotation speed is the minimum of the obtained rotation speeds.

The initial rotation speed difference refers to a difference value between the maximum rotation speed and the minimum rotation speed, and it can be understood that the difference value can effectively represent a maximum value of the working state difference between the plurality of energy storage flywheels.

Therefore, when the energy storage flywheel array is in a discharge mode and the comparison result shows that the current electric quantity of part of the energy storage flywheels is different, the maximum rotating speed and the minimum rotating speed in the plurality of rotating speeds can be determined, the initial rotating speed difference between the maximum rotating speed and the minimum rotating speed is determined, the subsequent steps are triggered, the comparison condition of the initial rotating speed difference and the rated rotating speed is determined, and the target control of the energy storage flywheel is realized according to the comparison condition.

S407: and determining the comparison condition of the initial rotation speed difference and the rated rotation speed, and performing target control on the energy storage flywheel according to the comparison condition.

In this embodiment, through the comparison condition of confirming initial rotational speed difference and rated speed, this comparison condition can effectively characterize the working property of this energy storage flywheel array, then carries out the target control to the energy storage flywheel according to the comparison condition, can make the individualized application scene of this control logic adaptation, effectively avoids when carrying out discharge control to each energy storage flywheel based on the same power, because the current electric quantity of part energy storage flywheel is inequality and causes the influence to system stability.

In some embodiments, the comparison condition of the initial rotation speed difference and the rated rotation speed is determined, and the target control is performed on the energy storage flywheel according to the comparison condition, the initial rotation speed difference and the rated rotation speed may be input into a third-party analysis device, the third-party analysis device determines the comparison condition of the initial rotation speed difference and the rated rotation speed, and transmits an analysis result to the execution main body of the embodiment of the present disclosure, or the initial rotation speed difference and the rated rotation speed may be jointly analyzed in any other possible manner, and then the target control on the energy storage flywheel is realized according to the joint analysis result, which is not limited to this.

Optionally, in some embodiments, the energy storage flywheel is subjected to target control according to the comparison condition, where if a target rotation speed difference between an initial rotation speed difference and a rated rotation speed is within a set range, a target discharge power is determined according to a current electric quantity of the energy storage flywheel, a corresponding energy storage flywheel is subjected to discharge control based on the target discharge power, and if the target rotation speed difference between the initial rotation speed difference and the rated rotation speed is greater than a maximum value in the set range, it is determined that the energy storage flywheel array fails.

The target rotation speed difference refers to a difference value between the initial rotation speed difference and the rated rotation speed, and it can be understood that the target rotation speed difference can represent the influence degree of the maximum value of the working state difference among the energy storage flywheels on the working performance of the energy storage flywheel array at the rated rotation speed to a certain extent.

The setting range refers to a value range of the target rotating speed difference configured in an application scene in advance.

The target discharging power refers to the discharging power of the energy storage flywheel array determined according to the current electric quantity of the energy storage flywheel when the target rotating speed difference between the initial rotating speed difference and the rated rotating speed is within a set range.

For example, rotation speed thresholds a and B may be preconfigured according to an application environment, where a is greater than B, in the discharging mode, assuming that the rotation speeds of each energy storage flywheel are different, it is stated that the current electric quantity of each energy storage flywheel is different, and a maximum speed value ω in all energy storage flywheels in the array is obtained by a bubbling algorithm _max And velocity minimum ω _min And obtaining the initial rotation speed difference omega by making difference between the two _Initial Then, the omega is adjusted _Initial With rated speed omega _{Rated value} Comparing to obtain target rotation speed difference omega _Target If ω is _Target If the rotating speed of one energy storage flywheel is higher than the set value A, the situation that the array cannot normally complete the discharging operation is indicated, and the system fault can be reported for shutdown maintenance. Otherwise if ω is _Target The value of (A) is between the set values A and B, which shows that the rotating speed of one energy storage flywheel is slightly lower than that of other energy storage flywheels in the system, in order to meet the discharging requirement of the system, the energy storage flywheel array can adopt derating operation, and the charging and discharging current transformer can distribute the discharging power according to the actual electric quantity in a weighting manner until the discharging is finished.

That is to say, when the energy storage flywheel array is in the discharging mode, if the comparison result indicates that the current electric quantities of different energy storage flywheels are the same, then the discharging control is performed on each energy storage flywheel based on the same power, if the comparison result indicates that the current electric quantities of partial energy storage flywheels are different, the maximum rotating speed and the minimum rotating speed in the multiple rotating speeds are determined, the initial rotating speed difference between the maximum rotating speed and the minimum rotating speed is determined, then the comparison condition between the initial rotating speed difference and the rated rotating speed is determined, and the target control is performed on the energy storage flywheel according to the comparison condition, so that the control logic can be adapted to an individualized application scenario, the influence on the system stability due to different current electric quantities of partial energy storage flywheels when the discharging control is performed on each energy storage flywheel based on the same power is effectively avoided, and the intelligence degree of the control method based on the flywheel energy storage system can be effectively improved.

In the embodiment, when the energy storage flywheel array is in a discharging mode, if the comparison result shows that the current electric quantities of different energy storage flywheels are the same, discharging control is performed on each energy storage flywheel based on the same power, if the comparison result shows that the current electric quantities of partial energy storage flywheels are different, the maximum rotating speed and the minimum rotating speed in a plurality of rotating speeds are determined, the initial rotating speed difference between the maximum rotating speed and the minimum rotating speed is determined, then the comparison condition of the initial rotating speed difference and the rated rotating speed is determined, and target control is performed on the energy storage flywheels according to the comparison condition, so that the control logic can be adapted to an individualized application scene, the influence on the system stability due to different current electric quantities of partial energy storage flywheels when discharging control is performed on each energy storage flywheel based on the same power is effectively avoided, and the intelligent degree of the control method based on the flywheel energy storage system can be effectively improved. When the target speed difference between the initial speed difference and the rated speed is within the set range, the fact that one or more energy storage flywheels with lower rotating speeds relative to other energy storage flywheels possibly exist in the energy storage flywheel array is represented, at the moment, the target discharging power is determined according to the current electric quantity of the energy storage flywheels, the applicability of the target discharging power can be effectively improved, the service life of the energy storage flywheels is effectively prolonged, when the target speed difference between the initial speed difference and the rated speed is larger than the maximum value in the set range, the fact that the rotating speeds of one or more energy storage flywheels exist in the energy storage flywheel array are too low to normally complete discharging work is represented, at the moment, the fact that the energy storage flywheel array breaks down is determined, the operation of a discharging mode is stopped, damage to the energy storage flywheels can be avoided, and the safety of the energy storage flywheel array can be effectively improved.

Fig. 5 is a schematic flow chart of a control method based on a flywheel energy storage system according to another embodiment of the present disclosure.

As shown in fig. 5, the control method based on the flywheel energy storage system includes:

s501: and determining the target mode of the energy storage flywheel array.

S502: and controlling the charging and discharging current transformer to detect the rotating speed of the corresponding energy storage flywheel.

S503: and determining the current electric quantity of the corresponding energy storage flywheel according to the rotating speed.

S504: and determining the comparison result of the current electric quantities of different energy storage flywheels.

For the description of S501-S504, reference may be made to the above embodiments, which are not described herein again.

S505: and if the energy storage flywheel arrays are in the standby mode and part of the rotating speeds are different, balancing the current electric quantity of different energy storage flywheels until the current electric quantity of different energy storage flywheels is the same.

The standby mode refers to a mode in which the energy storage flywheel array does not receive a charging or discharging instruction, and only needs to maintain the current working state of the energy storage flywheel array.

For example, the energy storage flywheel array in the embodiment of the disclosure may enter the standby mode when a discharge command is not received or the bus voltage is not detected to be lower than the threshold value.

It can be understood that, when the energy storage flywheel array is in the standby mode, and partial rotation speeds are different, the representation shows that the working performance of the energy storage flywheel array is affected at this moment, the current electric quantities of different energy storage flywheels are equalized until the current electric quantities of different energy storage flywheels are the same, the working performance of the energy storage flywheel array can be adjusted in time, the influence on the working performance of the energy storage flywheel array in the charging and/or discharging mode due to different partial rotation speeds is avoided, and the timeliness of the control logic can be effectively improved.

S506: if the energy storage flywheel array is in a standby mode and the plurality of rotating speeds are the same, when the rotating speed is less than the rated rotating speed, the corresponding energy storage flywheel is charged based on the rated power, so that the rotating speed of the energy storage flywheel reaches the rated rotating speed.

It can be understood that, when the energy storage flywheel array is in the standby mode and the plurality of rotation speeds are the same, if the rotation speed is less than the rated rotation speed, it is characterized that the current stored electric quantity of the energy storage flywheel array cannot meet the expected target based on the flywheel energy storage system, at this time, the corresponding energy storage flywheel is charged based on the rated power, so that the rotation speed of the energy storage flywheel reaches the rated rotation speed, the stored electric quantity based on the flywheel energy storage system can be supplemented in time, the influence on the normal operation of the equipment on the power grid side due to the insufficient stored electric quantity of the energy storage flywheel array is avoided, and the reliability of the control method based on the flywheel energy storage system can be effectively improved.

S507: and maintaining the energy storage flywheel at the rated rotating speed at the target current value.

The target current value refers to a corresponding working current value when the energy storage flywheel is at a rated rotating speed.

That is to say, in the embodiment of the present disclosure, when the energy storage flywheel array is in the standby mode, if part of the rotation speeds are different, the current electric quantities of different energy storage flywheels are equalized until the current electric quantities of different energy storage flywheels are the same, and if a plurality of rotation speeds are the same, when the rotation speed is less than the rated rotation speed, the corresponding energy storage flywheel is charged based on the rated power, so that the rotation speed of the energy storage flywheel reaches the rated rotation speed, and the energy storage flywheel is maintained at the rated rotation speed at the target current value.

For example, the embodiment of the disclosure may detect whether the rotation speed of each energy storage flywheel is the same when the energy storage flywheel array is in the standby mode, and if not, distribute power in a weighted manner according to the actual electric quantity of each energy storage flywheel, so that the electric quantity of each energy storage flywheel is quickly equalized and synchronously accelerated to the rated rotation speed. If the rotating speed of each energy storage flywheel is detected to be the same, judging whether the rotating speed value is less than the rated rotating speed omega _{Rated value} If it is less than the rated speed ω _{Rated value} At the moment, each energy storage flywheel can be controlled to be charged to the rated rotating speed omega according to the rated power _{Rated value} And maintaining the rotation speed at the rated rotation speed omega with the minimum current _{Rated value} 。

In this embodiment, through confirming the target mode that the energy storage flywheel array is located, control the rotational speed that charge-discharge converter detected corresponding energy storage flywheel, then unite a plurality of rotational speeds according to the target mode, carry out the target control to the energy storage flywheel, therefore, should be based on the rotational speed that the flywheel energy storage system can combine the target mode that the energy storage flywheel array is located and energy storage flywheel, realize the individualized control to each energy storage flywheel, can effectively promote this control process's flexibility, the diversified application scene of adaptation, can effectively promote the control effect to the energy storage flywheel. When the energy storage flywheel array is in the standby mode, if partial rotating speeds are different, current electric quantities of different energy storage flywheels are subjected to equalization processing until the current electric quantities of the different energy storage flywheels are the same, if a plurality of rotating speeds are the same, when the rotating speeds are smaller than the rated rotating speed, the corresponding energy storage flywheel is charged based on the rated power, so that the rotating speed of the energy storage flywheel reaches the rated rotating speed, and the energy storage flywheel is maintained to be in the rated rotating speed at a target current value.

Fig. 6 is a schematic structural diagram of a control device based on a flywheel energy storage system according to an embodiment of the present disclosure.

The flywheel energy storage system comprises: an energy storage flywheel array, the energy storage flywheel array comprising: the charging and discharging device comprises a plurality of energy storage flywheels and a charging and discharging current transformer electrically connected with the energy storage flywheels.

As shown in fig. 6, the control device 60 based on the flywheel energy storage system includes:

the determining module 601 is used for determining a target mode of the energy storage flywheel array;

the first control module 602 is configured to control the charging and discharging converter to detect a rotation speed of the corresponding energy storage flywheel;

and the second control module 603 is configured to perform target control on the energy storage flywheel according to a target mode in combination with a plurality of rotation speeds.

In some embodiments of the present disclosure, as shown in fig. 7, fig. 7 is a schematic structural diagram of a control device based on a flywheel energy storage system according to another embodiment of the present disclosure, and the second control module 603 includes:

the first determining submodule 6031 is configured to determine the current electric quantity of the corresponding energy storage flywheel according to the rotation speed;

a second determining submodule 6032, configured to determine a comparison result of current electric quantities of different energy storage flywheels;

and the control sub-module 6033 is configured to perform target control on the energy storage flywheel according to the target mode combined comparison result.

In some embodiments of the present disclosure, the target mode is a charging mode;

the control sub-module 6033 is specifically configured to:

when the energy storage flywheel array is in a charging mode and the comparison result shows that the current electric quantity of different energy storage flywheels is the same, adjusting each energy storage flywheel to a rated rotating speed;

when the energy storage flywheel array is in a charging mode and the comparison result shows that the current electric quantity of partial energy storage flywheels is different, the current electric quantities of different energy storage flywheels are subjected to equalization processing until the current electric quantities of different energy storage flywheels are the same.

In some embodiments of the present disclosure, the control sub-module 6033 is further configured to:

and balancing the current electric quantity of the energy storage flywheel, and adjusting the energy storage flywheel to a rated rotating speed.

In some embodiments of the present disclosure, the target mode is a discharge mode;

the control sub-module 6033 is specifically configured to:

when the energy storage flywheel array is in a discharging mode and the comparison result shows that the current electric quantities of different energy storage flywheels are the same, discharging control is carried out on each energy storage flywheel based on the same power;

when the energy storage flywheel array is in a discharging mode and the comparison result shows that the current electric quantity of part of the energy storage flywheels is different, determining the maximum rotating speed and the minimum rotating speed in a plurality of rotating speeds and determining the initial rotating speed difference between the maximum rotating speed and the minimum rotating speed;

and determining the comparison condition of the initial rotation speed difference and the rated rotation speed, and performing target control on the energy storage flywheel according to the comparison condition.

when the target rotation speed difference between the initial rotation speed difference and the rated rotation speed is within a set range, determining target discharge power according to the current electric quantity of the energy storage flywheel;

performing discharge control on the corresponding energy storage flywheel based on the target discharge power;

and when the target rotating speed difference between the initial rotating speed difference and the rated rotating speed is larger than the maximum value in the set range, determining that the energy storage flywheel array has a fault.

In some embodiments of the present disclosure, the target mode is a standby mode;

the control sub-module 6033 is specifically configured to:

when the energy storage flywheel array is in a standby mode and part of rotating speeds are different, balancing the current electric quantity of different energy storage flywheels until the current electric quantity of different energy storage flywheels is the same;

when the energy storage flywheel array is in a standby mode and a plurality of rotating speeds are the same, and the rotating speed is lower than the rated rotating speed, charging the corresponding energy storage flywheel based on the rated power so as to enable the rotating speed of the energy storage flywheel to reach the rated rotating speed;

and maintaining the energy storage flywheel at the rated rotating speed at the target current value.

In some embodiments of the present disclosure, the flywheel energy storage system further comprises: a photovoltaic power generation subsystem and a thermal power generating unit;

the control device 60 based on the flywheel energy storage system further includes:

the first storage module 604 is configured to store power provided by the photovoltaic power generation subsystem when the energy storage flywheel array receives the power absorption instruction;

the second storage module 605 is configured to determine whether the power provided by the photovoltaic power generation subsystem reaches a target power, and store the power provided by the generator outlet of the thermal power generating unit when the power does not reach the target power;

the processing module 606 is configured to absorb power from the photovoltaic power generation subsystem when the energy storage flywheel array does not receive the frequency modulation instruction, so as to maintain a dynamic floating charge state;

and the compensation module 607 is configured to, when the energy storage flywheel array receives a power release instruction, provide active power compensation for the power grid-side device in response to the frequency modulation instruction by the thermal power generating unit, so that the power grid-side device meets a stable frequency target.

It should be noted that the foregoing explanation of the flywheel energy storage system-based control method is also applicable to the flywheel energy storage system-based control device of the present embodiment, and details are not repeated here.

In this embodiment, through confirming the target mode that the energy storage flywheel array is located, control the rotational speed that charge-discharge converter detected corresponding energy storage flywheel, then unite a plurality of rotational speeds according to the target mode, carry out the target control to the energy storage flywheel, therefore, should be based on the rotational speed that the flywheel energy storage system can combine the target mode that the energy storage flywheel array is located and energy storage flywheel, realize the individualized control to each energy storage flywheel, can effectively promote this control process's flexibility, the diversified application scene of adaptation, can effectively promote the control effect to the energy storage flywheel.

Fig. 8 is a schematic structural diagram of a flywheel energy storage system according to an embodiment of the present disclosure.

The flywheel energy storage system 80 includes:

an energy storage flywheel array 801;

the energy storage flywheel array 801 includes: a plurality of energy storage flywheels 8011;

a charging and discharging current transformer 8012 electrically connected with the energy storage flywheel; and

a control means 60 based on a flywheel energy storage system.

FIG. 9 illustrates a block diagram of an exemplary electronic device suitable for use in implementing embodiments of the present disclosure. The electronic device 9 shown in fig. 9 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present disclosure.

As shown in fig. 9, the electronic device 9 is in the form of a general purpose computing device. The components of the electronic device 9 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that couples various system components including the system memory 28 and the processing unit 16.

Bus 18 represents one or more of any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures. These architectures include, but are not limited to, industry Standard Architecture (ISA) bus, micro Channel Architecture (MAC) bus, enhanced ISA bus, video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus, to name a few.

The electronic device 9 typically includes a variety of computer system readable media. Such media may be any available media that is accessible by electronic device 9 and includes both volatile and nonvolatile media, removable and non-removable media.

Memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM) 30 and/or cache memory 32. The electronic device 9 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 9, and commonly referred to as a "hard drive").

Although not shown in FIG. 9, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a compact disk read Only memory (CD-ROM), a digital versatile disk read Only memory (DVD-ROM), or other optical media) may be provided. In these cases, each drive may be connected to bus 18 by one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the disclosure.

A program/utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. Program modules 42 generally perform the functions and/or methodologies of the embodiments described in this disclosure.

The electronic device 9 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), with one or more devices that enable a person to interact with the electronic device 9, and/or with any devices (e.g., network card, modem, etc.) that enable the electronic device 9 to communicate with one or more other computing devices. Such communication may be through an input/output (I/O) interface 22. Furthermore, the electronic device 9 may also communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public Network (e.g., the Internet) via the Network adapter 20. As shown, the network adapter 20 communicates with other modules of the electronic device 9 over the bus 18. It should be understood that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the electronic device 9, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.

The processing unit 16 executes various functional applications and flywheel-based control by executing programs stored in the system memory 28, for example, to implement the flywheel-based control method mentioned in the foregoing embodiments.

In order to achieve the above embodiments, the present disclosure also proposes a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a flywheel energy storage system based control method as proposed by the previous embodiments of the present disclosure.

In order to achieve the above embodiments, the present disclosure further provides a computer program product, which when executed by an instruction processor in the computer program product, executes the control method based on the flywheel energy storage system as set forth in the foregoing embodiments of the present disclosure.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice in the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

It should be noted that, in the description of the present disclosure, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present disclosure, "a plurality" means two or more unless otherwise specified.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present disclosure includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure.

It should be understood that portions of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following technologies, which are well known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried out in the method of implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and the program, when executed, includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present disclosure may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer-readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure, and that changes, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present disclosure.

Claims

1. A control method based on a flywheel energy storage system is characterized in that the flywheel energy storage system comprises the following steps: energy storage flywheel array, photovoltaic power generation subsystem, thermal power generating set, the energy storage flywheel array includes: the charging and discharging current transformer is electrically connected with the energy storage flywheels;

wherein the method comprises the following steps:

determining a target mode of the energy storage flywheel array;

controlling the charging and discharging current transformer to detect the rotating speed of the corresponding energy storage flywheel;

performing target control on the energy storage flywheel according to the target mode and a plurality of rotating speeds;

wherein the method further comprises:

if the energy storage flywheel array receives an absorption power instruction, storing the power provided by the photovoltaic power generation subsystem, wherein the absorption power instruction is an instruction which acts on the energy storage flywheel array and is used for indicating the energy storage flywheel array to perform absorption power operation;

determining whether the power provided by the photovoltaic power generation subsystem reaches a target power, and if not, storing the power provided by a generator outlet of the thermal power generating unit;

if the energy storage flywheel array does not receive a frequency modulation instruction, absorbing power from the photovoltaic power generation subsystem to keep a dynamic floating charge state;

if the energy storage flywheel array receives a power release instruction, the thermal power generating unit is combined to respond to the frequency modulation instruction, and active power compensation is provided for power grid side equipment, so that the power grid side equipment meets a stable frequency target;

the target control of the energy storage flywheel according to the target mode and the combination of a plurality of rotating speeds comprises the following steps:

determining the current electric quantity of the corresponding energy storage flywheel according to the rotating speed;

determining comparison results of the current electric quantities of different energy storage flywheels;

performing target control on the energy storage flywheel according to the target mode and the comparison result;

the target mode is a charging mode, wherein the target control of the energy storage flywheel according to the target mode and the comparison result comprises: if the energy storage flywheel array is in the charging mode and the comparison result shows that the current electric quantity of different energy storage flywheels is the same, adjusting each energy storage flywheel to a rated rotating speed; if the energy storage flywheel array is in the charging mode and the comparison result shows that part of the current electric quantity of the energy storage flywheel is different, equalizing the current electric quantity of different energy storage flywheels until the current electric quantity of different energy storage flywheels is the same;

the target mode is a discharging mode, wherein the target control of the energy storage flywheel is performed according to the target mode and the comparison result, and the target control comprises the following steps: if the energy storage flywheel array is in the discharging mode and the comparison result shows that the current electric quantity of different energy storage flywheels is the same, discharging control is carried out on each energy storage flywheel based on the same power; if the energy storage flywheel array is in the discharging mode and the comparison result shows that the current electric quantity of part of the energy storage flywheels is different, determining the maximum rotating speed and the minimum rotating speed in the plurality of rotating speeds and determining the initial rotating speed difference between the maximum rotating speed and the minimum rotating speed; and determining the comparison condition of the initial rotation speed difference and the rated rotation speed, and performing target control on the energy storage flywheel according to the comparison condition.

2. The method according to claim 1, wherein the equalizing the current electric quantities of the different energy storage flywheels comprises:

and carrying out equalization processing on the current electric quantity of the energy storage flywheel, and adjusting the energy storage flywheel to the rated rotating speed.

3. The method according to claim 1, wherein the performing target control on the energy storage flywheel according to the comparison condition comprises:

if the target rotation speed difference between the initial rotation speed difference and the rated rotation speed is within a set range, determining target discharge power according to the current electric quantity of the energy storage flywheel;

and if the target rotating speed difference between the initial rotating speed difference and the rated rotating speed is larger than the maximum value in the set range, determining that the energy storage flywheel array has a fault.

4. The method of claim 1, wherein the target mode is a standby mode;

wherein, the target control is performed on the energy storage flywheel according to the target mode and the comparison result, and the method comprises the following steps:

if the energy storage flywheel array is in the standby mode and part of the rotating speeds are different, balancing the current electric quantity of different energy storage flywheels until the current electric quantity of different energy storage flywheels is the same;

if the energy storage flywheel array is in the standby mode and the rotating speeds are the same, when the rotating speed is lower than the rated rotating speed, the corresponding energy storage flywheel is charged based on the rated power, so that the rotating speed of the energy storage flywheel reaches the rated rotating speed;

and maintaining the energy storage flywheel at the rated rotating speed at a target current value.

5. A flywheel energy storage system based control apparatus, the flywheel energy storage system comprising: energy storage flywheel array, photovoltaic power generation subsystem, thermal power generating set, energy storage flywheel array includes: the charging and discharging current transformer is electrically connected with the energy storage flywheels;

wherein the apparatus comprises:

the determining module is used for determining a target mode of the energy storage flywheel array;

the first control module is used for controlling the charging and discharging current transformer to detect the rotating speed of the corresponding energy storage flywheel;

the second control module is used for carrying out target control on the energy storage flywheel according to the target mode and a plurality of rotating speeds;

wherein the apparatus further comprises:

the first storage module is used for storing the power provided by the photovoltaic power generation subsystem when the energy storage flywheel array receives an absorbed power instruction, wherein the absorbed power instruction is an instruction which acts on the energy storage flywheel array and is used for indicating the energy storage flywheel array to carry out absorbed power operation;

the second storage module is used for determining whether the power provided by the photovoltaic power generation subsystem reaches a target power or not, and storing the power provided by the generator outlet of the thermal power generating unit when the power does not reach the target power;

the processing module is used for absorbing power from the photovoltaic power generation subsystem when the energy storage flywheel array does not receive a frequency modulation instruction so as to keep a dynamic floating charge state;

the compensation module is used for providing active power compensation for the power grid side equipment in combination with the thermal power generating unit in response to the frequency modulation instruction when the energy storage flywheel array receives a power release instruction, so that the power grid side equipment meets a stable frequency target;

the second control module includes:

the first determining submodule is used for determining the current electric quantity of the corresponding energy storage flywheel according to the rotating speed;

the second determining submodule is used for determining a comparison result of the current electric quantities of different energy storage flywheels;

the control submodule is used for carrying out target control on the energy storage flywheel according to the target mode and the comparison result;

the target mode is a charging mode, wherein the control sub-module is specifically configured to: when the energy storage flywheel array is in the charging mode and the comparison result shows that the current electric quantity of different energy storage flywheels is the same, adjusting each energy storage flywheel to a rated rotating speed; when the energy storage flywheel array is in the charging mode and the comparison result shows that part of the current electric quantity of the energy storage flywheel is different, carrying out equalization processing on the current electric quantity of different energy storage flywheels until the current electric quantity of different energy storage flywheels is the same;

the target mode is a discharge mode, wherein the control sub-module is specifically configured to: when the energy storage flywheel array is in the discharging mode and the comparison result shows that the current electric quantity of different energy storage flywheels is the same, discharging control is carried out on each energy storage flywheel based on the same power; when the energy storage flywheel array is in the discharging mode and the comparison result shows that part of the current electric quantity of the energy storage flywheel is different, determining the maximum rotating speed and the minimum rotating speed in the plurality of rotating speeds and determining the initial rotating speed difference between the maximum rotating speed and the minimum rotating speed; and determining the comparison condition of the initial rotation speed difference and the rated rotation speed, and performing target control on the energy storage flywheel according to the comparison condition.

6. The apparatus of claim 5, wherein the control sub-module is further to:

7. The apparatus of claim 5, wherein the control sub-module is further to:

8. The apparatus of claim 5, wherein the target mode is a standby mode;

the control submodule is specifically configured to:

when the energy storage flywheel array is in the standby mode and part of the rotating speeds are different, balancing the current electric quantity of different energy storage flywheels until the current electric quantity of different energy storage flywheels is the same;

when the energy storage flywheel array is in the standby mode and the rotating speeds are the same, when the rotating speed is less than the rated rotating speed, the corresponding energy storage flywheel is charged based on the rated power, so that the rotating speed of the energy storage flywheel reaches the rated rotating speed;

9. A flywheel energy storage system, comprising:

an energy storage flywheel array;

the energy storage flywheel array comprises: a plurality of energy storage flywheels;

the charging and discharging current transformer is electrically connected with the energy storage flywheel; and

a flywheel energy storage system based control as claimed in any one of claims 5 to 8.

10. An electronic device, comprising:

at least one processor; and

a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-4.

11. A non-transitory computer readable storage medium having stored thereon computer instructions for causing a computer to perform the method of any one of claims 1-4.

12. A computer program product, characterized in that it comprises a computer program which, when being executed by a processor, carries out the steps of the method according to any one of claims 1-4.