CN216121814U - Flywheel energy storage and inertia conduction system with gear transmission speed change device - Google Patents

Abstract

The utility model provides a flywheel energy storage and inertia conduction system with a gear transmission speed change device. The flywheel energy storage unit comprises a flywheel rotor and an electric motor. The gear transmission speed change device comprises an input shaft and an output shaft, the flywheel rotor is in disconnectable transmission connection with the input shaft, and the rotating speed of the output shaft can be kept constant. The output shaft is in disconnectable transmission connection with a generator, and the generator is used for being driven by the output shaft to generate and output stable current. The flywheel energy storage and inertia conduction system is connected with a power grid, so that the rotational inertia in the power grid can be improved, necessary voltage and frequency support is provided for the power grid, the risk of large frequency deviation of the power grid is reduced, the power system can operate safely and stably, and the capacity of the power grid for efficiently accepting new energy is improved.

Description

Flywheel energy storage and inertia conduction system with gear transmission speed change device

Technical Field

The utility model relates to the technical field of energy storage, in particular to a flywheel energy storage and inertia conduction system with a gear transmission speed change device.

Background

With the development of a new round of energy revolution mainly based on clean energy, new energy is more and more in the power grid in China at present. However, in the new energy technology, a power electronic device is mostly connected to a power grid, but the power electronic device does not have rotational inertia, is difficult to participate in power grid regulation, and cannot provide necessary voltage and frequency support for the power grid or provide necessary damping action. Especially as the penetration of distributed energy sources connected to the grid via power electronics is higher and higher, the total moment of inertia of the grid is decreasing and thus the risk of large frequency deviations of the grid when heavy loads or sudden changes of the power supply occur is increasing. The access of a high proportion of power electronic devices will increase the unbalanced power impact of the system, resulting in the long-term low inertia level of the grid, which puts more and more pressure on the safe and stable operation of the power system. In order to improve and relieve the operating pressure of a power grid and the consumption pressure of new energy, an energy storage system with a certain capability of supporting dynamic adjustment of the power grid is urgently needed to improve the capability of the power grid for efficiently receiving the new energy.

SUMMERY OF THE UTILITY MODEL

The present invention is based on the discovery and recognition by the inventors of the following facts and problems:

flywheel energy storage is an energy storage technology that stores energy in the form of kinetic energy, and the energy storage/release is realized by accelerating/decelerating a rotor by a motor/generator. The main advantages of flywheel energy storage are fast climbing capability, high energy conversion efficiency, long service life and the like, and the flywheel energy storage has the unique advantages in providing auxiliary services such as inertia and frequency adjustment. And the flywheel has no geographical restriction, can easily install, has the advantage that can promote and can large-scale the duplication.

Currently, the existing flywheel energy storage technology uses a power electronic device to assist a motor/generator to perform a mutual conversion process between kinetic energy and electric energy. When the system needs to store electric energy, the system supplies alternating current transmitted from the outside to the motor in an AC/DC mode so as to drive the flywheel rotor to rotate and store energy; when discharging is needed, the power electronic device decouples the rotor inertia of the flywheel rotor, and plays roles of rectification, frequency modulation and voltage stabilization so as to meet the power consumption requirement of the load. However, the power electronic device has no rotational inertia and is difficult to participate in the power grid regulation, so the flywheel energy storage technology cannot solve the problem that the total rotational inertia is continuously reduced due to the use of the power electronic device in the current power grid,

the present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the utility model provides a flywheel energy storage and inertia conduction system with a gear transmission speed change device.

According to the embodiment of the utility model, the flywheel energy storage and inertia conduction system comprises: a flywheel energy storage unit comprising a flywheel rotor and a motor; the flywheel rotor is in transmission connection with the input shaft in a disconnectable manner, and the rotating speed of the output shaft can be kept constant; and the output shaft is in disconnectable transmission connection with the generator, and the generator is used for being driven by the output shaft to generate and output stable current.

The flywheel energy storage and inertia transmission system with the gear transmission speed change device provided by the embodiment of the utility model is provided with the gear transmission speed change device for transmitting the rotational inertia, the output rotating speed of the gear transmission speed change device can be kept constant, and the generator can stably output current. The flywheel energy storage and inertia conduction system provided by the embodiment of the utility model is connected with a power grid, decoupling, rectification, frequency modulation and voltage stabilization of a power electronic device are not needed, the problem that the total rotational inertia is continuously reduced due to the use of the power electronic device in the current power grid is solved, the rotational inertia in the power grid can be improved, necessary voltage and frequency support is provided for the power grid, the risk of large frequency deviation of the power grid is reduced, the power system can safely and stably operate, and the capability of the power grid for efficiently accepting new energy is improved.

In some embodiments, the transmission ratio of the gear change transmission is adjustable so that the rotational speed of the output shaft can be kept constant.

In some embodiments, the gear change transmission is capable of continuously adjusting its transmission ratio within a predetermined range.

In some embodiments, the gear change device comprises an input shaft gear, a planetary gear, an adjustment device, an adjustment gear, an intermediate shaft, a first gear, and an output shaft gear,

the input shaft gear is connected with the input shaft, the planetary gear is meshed with the input shaft gear, the planetary gear is installed on a planet carrier, the planetary gear is in transmission connection with the intermediate shaft, the adjusting gear is connected on the intermediate shaft, the adjusting device is movably arranged along the extending direction of the intermediate shaft and meshed with the adjusting gear, the rotating speed of the adjusting gear is adjustable by adjusting the position of the adjusting device, the first gear is connected with the intermediate shaft, the output shaft gear is connected with the output shaft, and the first gear is meshed with the output shaft gear.

In some embodiments, the flywheel energy storage and inertia transfer system has an energy release state in which the motor is in a standby state, the flywheel rotor is in driving connection with the input shaft to release kinetic energy, the output shaft is in driving connection with the generator to drive the generator to generate electricity, the generator is capable of inputting electric energy with a stable frequency into a power grid, and an energy storage state in which the motor draws electric energy from the power grid to drive the flywheel rotor to rotate to store kinetic energy, and the generator is capable of stopping inputting current into the power grid.

In some embodiments, in the energy storage state, the generator is idling, and/or the transmission connection between the flywheel energy storage unit and the input shaft is disconnected, and/or the rotation speed of the output shaft is zero, and/or the transmission connection between the output shaft and the generator is disconnected.

In some embodiments, the flywheel energy storage and inertia conduction system is provided with a standby state in which the electric motor is on standby and the generator is idling.

In some embodiments, the flywheel energy storage and inertia transfer system further comprises: the flywheel energy storage controller is used for controlling energy input and input power of the flywheel energy storage unit; and an inertia conduction controller for regulating a gear ratio of the inertia conduction device so as to keep an output rotation speed of the inertia conduction device constant.

In some embodiments, the flywheel energy storage controller comprises: the power grid detection module is used for detecting the current frequency of a power grid; and the motor control module is used for controlling the starting and the stopping of the motor and the input power according to the current frequency of the power grid.

In some embodiments, the gear change controller comprises: the input rotating speed detection module is used for detecting the rotating speed of the input shaft; the operation module is used for calculating an ideal speed ratio of the gear transmission device according to the rotating speed of the input shaft and the preset rotating speed of the output shaft; a transmission ratio control module for regulating a transmission ratio of the geared transmission based on the desired transmission ratio.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

Fig. 1 is a first schematic diagram of a flywheel energy storage and inertia transfer system according to an embodiment of the utility model.

Fig. 2 is a second schematic diagram of a flywheel energy storage and inertia transfer system according to an embodiment of the utility model.

FIG. 3 is a schematic diagram of a flywheel energy storage controller according to an embodiment of the utility model.

FIG. 4 is a schematic diagram of a gear change controller according to an embodiment of the present invention.

Reference numerals:

a flywheel energy storage and inertia conduction system 1; a flywheel energy storage unit 10; a flywheel rotor 111; an electric motor 112; a gear change 20; an input shaft 211; an output shaft 212; a generator 30;

an input shaft gear 110; a planetary gear 120; an adjustment device 130; an adjustment gear 140; an intermediate shaft 150; a first gear 160; an output shaft gear 170; an inner gear ring 180; a coupling 190;

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

The basic structure of a flywheel energy storage and inertia transfer system 1 of an embodiment of the utility model is described below with reference to fig. 1. As shown in fig. 1, the flywheel energy storage and inertia transfer system 1 includes a flywheel energy storage unit 10, a gear transmission 20, and a generator 30.

The flywheel energy storage unit 10 comprises a flywheel rotor 111 and an electric motor 112. Acceleration of the flywheel rotor 111 enables storage of energy and deceleration of the flywheel rotor 111 enables release of energy. Wherein the flywheel rotor 111 is connected to an electric motor 112, and the electric motor 112 is used for driving the flywheel rotor 111 to rotate. The electric motor 112 accelerates by driving the flywheel rotor 111, and finally realizes that the electric energy is stored in the flywheel energy storage unit 10 in the form of kinetic energy. Alternatively, the electric motor 30 may be connected to the grid in order to obtain electrical energy from the grid for driving the flywheel rotor 111.

The gear change device 20 includes an input shaft 211 and an output shaft 212. The gear transmission 20 is used for transmitting the rotational inertia of the flywheel rotor 111 due to the rotation and driving the generator 30 to generate and output electric energy. The flywheel rotor 111 is in a disconnectable drive connection with the input shaft 211, i.e. the flywheel rotor 111 may or may not be in a drive connection with the input shaft 211. The output shaft 212 is disconnectably drivingly connected to the generator 30, i.e., the output shaft 212 may or may not be drivingly connected to the generator 30 to drive the generator 30 to generate electricity, and the geared transmission 20 may not drive the generator 30 to generate electricity. Alternatively, the generator 30 may input the generated electrical energy into the grid.

The rotational speed of the output shaft 212 of the gear change device 20 can be kept constant so that the gear change device 20 can drive the generator 30 to generate and output a stable current. The rotational speed of the output shaft 212, that is, the output rotational speed of the gear transmission 20, is kept constant, so that kinetic energy can be stably input to the generator 30, the generator 30 can stably generate electricity under stable driving, and a stable current can be generated and output, that is, the generator 30 can generate and output a constant-frequency current.

Optionally, the flywheel energy storage and inertia transfer system 1 may be connected to the grid to participate in the grid inertia response, and store the overflowed energy in the flywheel rotor 111 according to the overflowed proportion or draw energy from the flywheel rotor 111 according to the missing proportion to supplement the grid, so as to reduce the grid frequency fluctuation.

The flywheel energy storage and inertia conduction system provided by the embodiment of the utility model is provided with the gear transmission speed change device for conducting rotational inertia, the output rotating speed of the gear transmission speed change device can be kept constant, and the generator can stably output current. The flywheel energy storage and inertia conduction system provided by the embodiment of the utility model is connected with a power grid, decoupling, rectification, frequency modulation and voltage stabilization of a power electronic device are not needed, the problem that the total rotational inertia is continuously reduced due to the use of the power electronic device in the current power grid is solved, the rotational inertia in the power grid can be improved, necessary voltage and frequency support is provided for the power grid, the risk of large frequency deviation of the power grid is reduced, the power system can safely and stably operate, and the capability of the power grid for efficiently accepting new energy is improved.

In some embodiments, the transmission ratio of the gear change device 20 is adjustable to enable the rotational speed of the output shaft 212 to remain constant. The speed ratio of the geared transmission 20 is the ratio of the rotational speed of the input shaft 211 (the input rotational speed of the geared transmission 20) to the rotational speed of the output shaft 212 (the output rotational speed of the geared transmission 20). The gear ratio of the geared transmission 20 is determined by the rotation speed of the input shaft 211 and the rotation speed of the output shaft 212, and the rotation speed of the input shaft 211 of the geared transmission 20 is determined by the gear ratio of the geared transmission 20. Therefore, by making the gear ratio of the gear change device 20 adjustable, the purpose of keeping the rotation speed of the output shaft 212 constant can be achieved.

In the present embodiment, the input rotational speed of the gear transmission 20 is equal to the output rotational speed of the flywheel rotor 111, and the rotational speed of the generator 30 is equal to the output rotational speed of the gear transmission 20.

It will be appreciated by those skilled in the art that the rotational speed of the flywheel rotor 111 is typically constantly changing, and that by adjusting the transmission ratio of the gear change transmission 20, the rotational speed of the output shaft 212 can be kept constant regardless of changes in the rotational speed of the flywheel rotor 111. That is, in order to keep the rotation speed of the output shaft 212 constant, a preset value is set for the rotation speed of the output shaft 212, the gear ratio of the gear transmission 20 can be calculated from the current rotation speed of the flywheel rotor 111, and the gear ratio of the gear transmission 20 is continuously adjusted according to the gear ratio, so that the rotation speed of the output shaft 212 can be kept constant, and the generator 30 can stably generate power.

Further, in order to make the flywheel energy storage and inertia conduction system 1 better enable the output rotation speed of the transmission 20 to be constant, so that the generator 30 can output stable current, in some embodiments, the transmission 20 has a stepless speed change function, that is, the transmission 20 can continuously adjust its speed ratio within a preset range, or the transmission 20 can continuously obtain any speed ratio within an allowable speed change range. The gear transmission device 20 has a stepless speed change function, so that the speed change ratio of the gear transmission device 20 can be adjusted more flexibly, the stability of the output rotating speed of the gear transmission device 20 is improved, and the generator 30 can better continuously and stably output current to the power grid.

In some embodiments, as shown in fig. 2, the gear change transmission device 20 having a continuously variable transmission function includes an input shaft gear 110, a planetary gear 120, an adjustment device 130, an adjustment gear 140, an intermediate shaft 150, a first gear 160, an output shaft gear 170, and an internal gear ring 180.

The input shaft gear 110 is connected with the input shaft 211, the planetary gears 120 are mounted on the planet carrier and meshed with the input shaft gear 110, the rotation of the input shaft 211 drives the input shaft gear 110 to rotate, the planetary gears 120 meshed with the input shaft gear 110 are driven to rotate, and the inner gear ring 180 and the planetary gears 120 rotate coaxially. Ring gear 180 is connected to intermediate shaft 150 via coupling 190. The adjustment gear 140 is connected to and rotates synchronously with the intermediate shaft 150. The adjusting device 130 is connected to the output shaft 212 and can slide back and forth along the axial direction of the output shaft 212, and the sliding of the adjusting device 130 can enable the adjusting device to be meshed with the adjusting gear 140 at different positions in the axial direction, so that the rotating speed of the adjusting gear 140 can be adjusted through the sliding adjusting device 130. The adjustable rotational speed of the adjusting gear 140 enables the rotational speed of the intermediate shaft 150 to be adjusted. First gear 160 is connected to and rotates synchronously with countershaft 150. The output shaft gear 170 is connected with the output shaft 212, the first gear 160 is meshed with the output shaft gear 170 to drive the output shaft gear 170 to rotate, and the rotation of the output shaft gear 170 drives the output shaft 212 to rotate.

It will be appreciated that by adjusting the position of the adjustment device 130 in the axial direction, it is possible to achieve an adjustable gear ratio of the gear change device 20, the gear ratio of the gear change device 20 being the ratio of the rotational speed of its input shaft 211 to the rotational speed of its output shaft 212.

When the flywheel rotor 111 rotates up under the driving of the electric motor 112, the desired speed ratio of the gear change mechanism 20 calculated from the ratio of the rotation speed of the input shaft 211 to the preset rotation speed of the output shaft 212 also increases, and therefore, the speed ratio of the gear change mechanism 20 should be regulated to increase so that the speed ratio reaches the desired speed ratio. When the rotational speed of the flywheel rotor 111 releasing kinetic energy decreases, the desired gear ratio of the gear change transmission 20 calculated from the ratio of the rotational speed of the input shaft 211 to the preset rotational speed of the output shaft 212 also decreases, and therefore the gear ratio decrease of the gear change transmission 20 should be regulated so that the gear ratio thereof reaches the desired gear ratio.

In summary, when the rotation speed of the flywheel rotor 111 increases, that is, the input rotation speed of the gear transmission 20 increases, the gear ratio of the gear transmission 20 should be controlled to increase in order to keep the output rotation speed constant. When the rotation speed of the flywheel rotor 111 decreases, that is, the input rotation speed of the speed change gear transmission device 20 decreases, the speed ratio of the speed change gear transmission device 20 should be increased in order to keep the output rotation speed constant. Therefore, the flywheel energy storage and inertia conduction system 1 provided by the embodiment of the utility model can realize the output of constant-frequency current, and the constant-frequency current can be directly connected to a grid without a power electronic device.

It should be noted that the embodiment shown in fig. 2 is only an example of the present invention, and in other embodiments, the gear transmission device 20 may also be in other structural forms known to those skilled in the art and capable of implementing a stepless speed change function, and is not listed here.

The following describes the composition, connection relationship and operation flow of the flywheel energy storage and inertia conduction system 1 according to the present invention by taking the schematic diagram of the flywheel energy storage and inertia conduction system 1 shown in fig. 1 as an example.

In the embodiment shown in fig. 1, the flywheel energy storage and inertia transfer system 1 comprises a flywheel energy storage unit 10, a gear transmission 20 and a generator 30. In this embodiment, the rotational inertia of the geared transmission 20 is transmitted in a fixed direction, i.e., from the flywheel rotor 111 to the generator 30.

Further, the flywheel energy storage and inertia conduction system 1 provided by the embodiment of the present application has an energy storage state and an energy release state, and can switch between the energy storage state and the energy release state. The flywheel energy storage and inertia conduction system 1 may also be said to include an energy storage stage and an energy release stage in the operation process, where the energy storage stage corresponds to the energy storage state and the energy release stage corresponds to the energy release state. When the flywheel energy storage and inertia conduction system 1 is in an energy storage state, converting electric energy into kinetic energy for storage; when the flywheel energy storage and inertia conduction system 1 is in an energy release state, the kinetic energy stored by the flywheel energy storage and inertia conduction system is released, and the kinetic energy is converted into electric energy to be output.

The following describes the technical solution of the present application by taking as an example that the generator 30 can be electrically connected to a power grid and input electric energy into the power grid, specifically as follows:

in the energy storage state, the motor 112 operates and drives the flywheel rotor 111 to rotate, the rotation speed of the flywheel rotor 111 is increased to realize energy storage, and in the state, the generator 30 stops inputting electric energy into the power grid.

Alternatively, the rotation speed of the flywheel rotor 111 is increased to the rated maximum rotation speed under the driving of the motor 112, and after the rated maximum rotation speed is reached, the flywheel rotor 111 completes energy storage, and then the motor 112 stops driving the flywheel rotor 111.

In some embodiments, the flywheel rotor 111, the gear transmission 20 and the generator 30 are in transmission connection in the energy storage state, and the generator 30 idles to stop the input of electric energy into the power grid. That is, during the energy storage phase, the power transmission line between the generator 30 and the grid is disconnected, and the generator 30 does not generate power.

It should be noted that in other embodiments, there may be other ways to stop the generator 30 from inputting electric energy into the power grid:

for example, in some alternative embodiments, in the energy storage state, the flywheel energy storage unit 10 is disconnected from the transmission gear 20, that is, the flywheel rotor 111 is disconnected from the input shaft 211, the rotational inertia of the flywheel rotor 111 can no longer be transmitted to the transmission gear 20, and therefore the transmission gear 20 cannot drive the generator 30 to operate, that is, the generator 30 does not generate electricity, so that the generator 30 stops inputting electric energy into the power grid. And/or, in the energy storage state, the rotation speed of the output shaft 212 of the gear transmission 20 is zero, i.e., the output rotation speed of the gear transmission 20 is zero. It is also considered that the gear ratio of the geared transmission 20 is zero. Therefore, the gear transmission 20 cannot drive the generator 30 to operate, and the generator 30 stops inputting electric energy into the grid. And/or, in the energy storage state, the transmission connection between the gear transmission 20 and the generator 30 is disconnected, that is, the connection between the output shaft 212 and the generator 30 is disconnected, and the generator 30 cannot be driven by the gear transmission 20, so that the generator 30 stops inputting electric energy into the power grid.

The generator 30 is preferably idled in the energy storage state to realize the technical scheme of stopping the input of the electric energy into the power grid.

In the energy release state, the motor 112 is in standby, the flywheel rotor 111 is in transmission connection with the input shaft 211, the output shaft 212 is in transmission connection with the generator 30, the flywheel rotor 111 releases kinetic energy, the rotating speed is reduced, the gear transmission device 20 drives the generator 30 to generate electricity, and the generator 30 inputs the generated electric energy into the power grid.

The standby state of the motor 112 in the energy release state means that the motor 112 is not operated and does not drive the flywheel rotor 111 to accelerate. That is, when the flywheel energy storage and inertia conduction system 1 is in the energy release state, only energy is output and no energy is input in the flywheel energy storage and inertia conduction system 1. When the flywheel energy storage and inertia conduction system 1 is in the energy storage state, only energy is input into the flywheel energy storage and inertia conduction system 1, and no energy is output.

It should be noted that, in the energy release state, the output shaft 212 rotates at the preset rotation speed, so that the generator 30 generates the stable current. That is, in the power release state, the output rotation speed of the gear transmission 20 is kept constant, and the generator 30 can input electric power having a stable frequency to the grid at the constant rotation speed.

Alternatively, the output speed of the gear change mechanism 20 is constant at 3000rpm, that is, the generator 30 can operate at a constant speed of 3000rpm to generate electrical energy with a stable frequency.

Further alternatively, the frequency of the current output by the generator 30 is 50Hz, and the generator 30 can transmit power directly to the grid.

In some embodiments, the flywheel energy storage and inertia conduction system 1 is also provided with a standby state. It can also be said that the flywheel energy storage and inertia transfer system 1 further comprises a standby phase during operation. When the flywheel energy storage and inertia conduction system 1 is in a standby state, the flywheel energy storage and inertia conduction system 1 is in an energy holding stage, that is, there is no energy input nor energy output, and the flywheel energy storage and inertia conduction system 1 operates with minimum loss. In the standby state, the motor 112 is in standby, the generator 30 is in idle, and the flywheel rotor 111 releases a small amount of kinetic energy to keep the input shaft of the generator 30 rotating at a preset rotation speed.

For example, when the frequency in the power grid is equal to a predetermined value (e.g., the power grid frequency is equal to 50Hz), the flywheel energy storage and inertia conduction system 1 is put into a standby state, and the flywheel rotor 111 consumes a small amount of kinetic energy to maintain the input shaft of the generator 30 to rotate at a predetermined rotation speed (e.g., 3000rpm) in a standby mode, so as to ensure that the flywheel energy storage and inertia conduction system 1 can respond to the next power grid frequency fluctuation in an optimal state. When the frequency in the power grid is greater than a preset value, the flywheel energy storage and inertia conduction system 1 is enabled to enter an energy storage state, the flywheel rotor 111 absorbs overflowed electric energy from the power grid through the transmission shaft, the rotating speed of the flywheel rotor 111 rises, and the electric energy is converted into kinetic energy to be stored in the flywheel rotor 111, so that the frequency of the power grid is reduced; optionally, the electric motor 112 draws the overflowed electric energy from the power grid to drive the flywheel rotor 111 to rotate at a higher speed, so that the electric energy is converted into kinetic energy to be stored in the flywheel rotor 111, thereby reducing the frequency of the power grid. When the frequency in the power grid is smaller than the preset value, the flywheel energy storage and inertia conduction system 1 is enabled to enter an energy release state, the motor 112 is in a standby state, the flywheel rotor 111 releases kinetic energy to drive the generator 30 to operate, the generator 30 transmits electric energy to the power grid, and therefore the frequency of the power grid is increased.

In some embodiments, as shown in fig. 3, the flywheel energy storage and inertia conductive system 1 further comprises a flywheel energy storage controller. The flywheel energy storage controller is used for controlling energy input and input power of the flywheel energy storage unit 10, that is, the flywheel energy storage controller is used for controlling whether to input electric energy into the flywheel energy storage unit 10 or not, and is also used for controlling power of the electric energy input into the flywheel energy storage unit 10. Optionally, the flywheel energy storage controller is powered by an independent power supply to ensure that it is not affected by fluctuations in the external power grid.

The flywheel energy storage controller comprises a power grid detection module and a motor control module. The power grid detection module is used for detecting the current frequency of the power grid. Optionally, the power grid detection module can monitor the frequency of the power grid in real time, so as to better respond to and regulate the frequency of the power grid.

The motor control module is in communication connection with the power grid detection module, the power grid detection module transmits the detected frequency of the power grid to the motor control module, and the motor control module receives the frequency signal and controls the opening and closing of the motor 112 and the input power of the motor 112 according to the frequency signal.

That is, when the motor control module receives the current frequency signal of the power grid and determines that the motor 112 needs to be started to store energy in the flywheel energy storage unit 10, the motor control module sends a start signal to the motor 112, so that the motor 112 is turned on and absorbs electric energy from the power grid.

When the motor control module judges that energy is not required to be stored in the flywheel energy storage unit 10 according to the current frequency of the power grid, a shutdown signal is sent to the motor 112, and the motor 112 is shut down.

The motor control module may determine the input power of the motor 112 according to the current frequency of the grid, and control the input power to the motor 112.

For example, when the current frequency of the grid rises above a preset value, the motor control module determines to change the input power of the motor 112 to tune the grid, suppressing further increase in the grid frequency. By changing the input power of the motor 112 (the power corresponding to the partial frequency difference value larger than the preset value), the flywheel energy storage unit 10 can absorb more electric energy, and the rotation speed of the flywheel rotor 111 is increased. And the larger the frequency deviation of the grid, the larger the moment of the flywheel rotor 111, i.e. the larger the input power of the electric motor 112. It will be appreciated that the input power to the motor 112 will not exceed the maximum power that it can withstand.

Therefore, the flywheel energy storage and inertia conduction system 1 provided by the embodiment of the application can realize auxiliary services such as disturbance power distribution, inertia response, primary frequency modulation and the like on a power grid, and improve the primary frequency modulation and inertia supporting capacity of a power system. Compared with the traditional mechanical inertia, the flywheel energy storage and inertia conduction system 1 provided by the embodiment of the application can provide faster and more stable frequency control.

In some embodiments, as shown in fig. 4, the flywheel energy storage and inertia transfer system 1 further comprises a gear ratio controller for regulating the gear ratio of the gear transmission 20, and the gear ratio controller comprises an input rotation speed detection module, an operation module and a gear ratio control module.

Wherein the input speed detection module is configured to detect an input speed of the gear change transmission 20. The operation module is used for calculating an ideal gear ratio of the gear transmission speed change device according to preset values of input rotating speed and output rotating speed of the gear transmission speed change device. The speed ratio control module is used to regulate the speed ratio of the geared transmission 20 according to a desired speed ratio.

It will be appreciated that in some embodiments, the input speed of the transmission 20 is equal to the speed of the flywheel rotor 111, and the input speed detection module can obtain the input speed of the transmission 20 by detecting the speed of the flywheel rotor 111.

The preset value of the output rotating speed can be input into the operation module in advance. For example, the preset value of the output rotation speed is 3000 rpm. The operation module is in communication connection with the input rotating speed detection module, can receive a rotating speed signal sent by the input rotating speed detection module, calculates an ideal gear ratio of the gear transmission speed change device according to the rotating speed signal and a preset value of a preset output rotating speed, and transmits the calculated ideal gear ratio to the gear ratio control module. The speed ratio control module is connected to the inertia transmitting unit 20 to adjust the speed ratio of the gear change unit 20 to a desired speed ratio so that the output rotation speed of the gear change unit 20 is constant at the preset value.

In the embodiment shown in FIG. 2, the ratio control module of the gear change controller can adjust the ratio of the geared transmission 20 to the desired ratio by adjusting the axial position of the adjustment device 130.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific 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 are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

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

Claims (10)

1. A flywheel energy storage and inertia transfer system with a geared transmission, comprising:

a flywheel energy storage unit comprising a flywheel rotor and a motor;

the flywheel rotor is in transmission connection with the input shaft in a disconnectable manner, and the rotating speed of the output shaft can be kept constant; and

the output shaft is in drive connection with the generator in a disconnectable mode, and the generator is used for being driven by the output shaft to generate and output electric energy with stable frequency.

2. The flywheel energy storage and inertia transfer system of claim 1, wherein the transmission ratio of the gear change device is adjustable so that the rotational speed of the output shaft can be kept constant.

3. The flywheel energy storage and inertia transfer system of claim 2, wherein the gear change mechanism is capable of continuously adjusting its transmission ratio within a predetermined range.

4. The flywheel energy storage and inertia transfer system of claim 3, wherein the gear change comprises an input shaft gear, a planetary gear, an adjustment device, an adjustment gear, an intermediate shaft, a first gear, and an output shaft gear,

the input shaft gear is connected with the input shaft, the planetary gear is meshed with the input shaft gear, the planetary gear is installed on a planet carrier, the planetary gear is in transmission connection with the intermediate shaft, the adjusting gear is connected on the intermediate shaft, the adjusting device is movably arranged along the extending direction of the intermediate shaft and meshed with the adjusting gear, the rotating speed of the adjusting gear is adjustable by adjusting the position of the adjusting device, the first gear is connected with the intermediate shaft, the output shaft gear is connected with the output shaft, and the first gear is meshed with the output shaft gear.

5. The flywheel energy storage and inertia transfer system with a geared transmission of claim 1, wherein the flywheel energy storage and inertia transfer system has a de-energized state and an energized state,

in the energy releasing state, the motor is in a standby state, the flywheel rotor is in transmission connection with the input shaft so as to release kinetic energy, the output shaft is in transmission connection with the generator so as to drive the generator to generate electricity, and the generator can input electric energy with stable frequency into a power grid,

in the energy storage state, the motor draws electric energy from the power grid to drive the flywheel rotor to rotate so as to store kinetic energy, and the generator can stop inputting current into the power grid.

6. The flywheel energy storage and inertia transfer system with a geared transmission of claim 5, wherein in the energy storage state,

the generator idles, and/or the transmission connection between the flywheel energy storage unit and the input shaft is disconnected, and/or the rotating speed of the output shaft is zero, and/or the transmission connection between the output shaft and the generator is disconnected.

7. The flywheel energy storage and inertia transfer system with a geared transmission of claim 1, wherein the flywheel energy storage and inertia transfer system has a standby state in which the electric motor is on standby and the generator is idling.

8. The flywheel energy storage and inertia transfer system with a geared transmission of claim 1, further comprising:

the flywheel energy storage controller is used for controlling energy input and input power of the flywheel energy storage unit; and

a gear change controller for regulating a gear ratio of the gear change transmission so as to keep a rotational speed of the output shaft constant.

9. The flywheel energy storage and inertia transfer system of claim 8, wherein the flywheel energy storage controller comprises:

the power grid detection module is used for detecting the current frequency of a power grid;

and the motor control module is used for controlling the starting and the stopping of the motor and the input power according to the current frequency of the power grid.

10. The flywheel energy storage and inertia transfer system of claim 8, wherein the gear change controller comprises:

the input rotating speed detection module is used for detecting the rotating speed of the input shaft;

the operation module is used for calculating an ideal speed ratio of the gear transmission device according to the rotating speed of the input shaft and the preset rotating speed of the output shaft;

a transmission ratio control module for regulating a transmission ratio of the geared transmission based on the desired transmission ratio.

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