Energy storage flywheel braking method and apparatus

Abstract

The application provides a kind of energy storage flywheel braking method and device, comprising: detection module and control module, detection module is used to detect the real-time voltage of the energy storage flywheel unit;Control module generates corresponding control signal by following the change condition of the real-time voltage, and adjusts the braking mode and braking speed of the energy storage flywheel system based on the control signal.The control module follows the change condition of the real-time voltage of the energy storage flywheel unit, compares the real-time voltage with the threshold voltage set by the energy storage flywheel unit;According to the result of comparison operation, the corresponding control signal is generated;According to the control signal, combined with the remote braking scene and the alarm signal of the energy storage flywheel unit, the switching efficiency and accuracy between the direct current braking mode and the alternating current control mode of the energy storage flywheel system are improved, and the braking efficiency of the energy storage flywheel system is greatly improved, which has wide applicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy storage, and in particular to a method and device for braking an energy storage flywheel. BACKGROUND

[0002] An energy storage flywheel operates based on the law of conservation of energy and the kinetic energy theorem. When power supply is sufficient, the energy storage flywheel unit drives the flywheel to rotate at high speed through an electric motor, converting electrical energy into kinetic energy of the flywheel for storage. In the braking or energy release phase, the flywheel rotates at a reduced speed, and the kinetic energy is converted back into electrical energy through a generator for use by the system or grid output. In the braking condition, as the flywheel speed decreases, the back electromotive force of the energy storage flywheel unit decreases, resulting in a decrease in power and a decrease in braking efficiency, which increases the risk of safety hazards. If the second converter fails, it will also cause unbalanced braking and increase the risk of safety hazards. If the flywheel speed detection fails, it will also cause a decrease in braking efficiency and increase the risk of safety hazards. Therefore, how to improve the effectiveness of flywheel speed detection and improve braking efficiency is a technical problem that needs to be solved for the energy storage flywheel system.

[0003] It should be noted that the above introduction to the technical background is only for the convenience of clearly and completely describing the technical solutions of the present application and for the convenience of understanding by those skilled in the art. The above technical solutions cannot be considered as known to those skilled in the art merely because they are described in the background section of the present application. SUMMARY

[0004] The present application provides a method and device for braking an energy storage flywheel.

[0005] The first aspect of the present application provides a device for braking an energy storage flywheel, which is suitable for an energy storage flywheel system, and the energy storage flywheel system comprises a first converter, a second converter, a braking module and an energy storage flywheel unit, wherein the input end of the first converter is connected to a power grid bus; the first end of the braking module is connected to the output end of the first converter; the input end of the second converter is connected to the second end of the braking module and the output end of the first converter; the energy storage flywheel unit is connected to the output end of the second converter; and the device for braking an energy storage flywheel comprises:

[0006] a detection module connected to the output end of the second converter, for detecting the real-time voltage of the energy storage flywheel unit;

[0007] a control module connected to the detection module, the third end of the braking module, the output end of the second converter and the output end of the first converter, for generating a corresponding control signal by following the change condition of the real-time voltage, and adjusting the braking mode and braking speed of the energy storage flywheel system based on the control signal.

[0008] wherein, if the real-time voltage ≥ the threshold voltage set by the energy storage flywheel unit, the control signal makes the energy storage flywheel system work in the AC braking mode; if the real-time voltage < the threshold voltage set by the energy storage flywheel unit, the control signal makes the energy storage flywheel system work in the DC braking mode.

[0009] The second aspect embodiment of the present application provides an energy storage flywheel braking method, which is applicable to the energy storage flywheel braking device provided in the first aspect embodiment of the present application, and includes the following steps:

[0010] Obtaining the back electromotive force of the energy storage flywheel unit;

[0011] According to the comparison operation between the voltage threshold set by the energy storage flywheel braking device and the back electromotive force, a corresponding braking strategy is determined;

[0012] According to the braking strategy, the energy storage flywheel system is subjected to braking operation.

[0013] The third aspect embodiment of the present application provides an electronic device, which includes a processor and a memory for storing instructions executable by the processor, wherein the processor is configured to execute the instructions to implement the energy storage flywheel braking method provided in the second aspect embodiment of the present application.

[0014] The fourth aspect embodiment of the present application provides a non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by the processor of an electronic device, the electronic device can execute the method provided in the second aspect embodiment of the present application.

[0015] The fifth aspect embodiment of the present application provides a computer program product, which includes a computer program, and the computer program, when executed by the processor in a communication device, implements the method provided in the second aspect embodiment of the present application.

[0016] The embodiments of the present application provide at least the following beneficial effects:

[0017] By controlling the change condition of the real-time voltage of the energy storage flywheel unit, the real-time voltage and the threshold voltage set by the energy storage flywheel unit are subjected to comparison operation; according to the result of the comparison operation, a corresponding control signal is generated; according to the control signal, and in combination with the remote braking scene and the alarm signal of the energy storage flywheel unit, the switching efficiency and accuracy between the DC braking mode and the AC control mode of the energy storage flywheel system are improved, the braking efficiency of the energy storage flywheel system is greatly improved, and the method has wide applicability.

[0018] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of embodiments, taken in conjunction with the accompanying drawings in which:

[0020] Figure 1 A structural schematic diagram of an energy storage flywheel braking device provided by an embodiment of the present application;

[0021] Figure 2 A structural schematic diagram of a detection module provided by an embodiment of the present application;

[0022] Figure 3 A structural schematic diagram of an auxiliary braking unit provided by an embodiment of the present application;

[0023] Figure 4 A structural schematic diagram of a resistance subunit provided by an embodiment of the present application;

[0024] Figure 5 A flowchart of an energy storage flywheel braking method provided by an embodiment of the present application;

[0025] Figure 6 A structural schematic diagram of an electronic device provided by an embodiment of the present application;

[0026] Figure 7 A structural schematic diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0027] The exemplary embodiments will be described in detail herein below with reference to the drawings. In the following description, the same drawings reference numbers are used to denote like or similar elements. The embodiments described in the following exemplary embodiments do not represent all the implementations in accordance with the embodiments of the present application. Rather, they are merely examples in accordance with some aspects of the embodiments of the present application as detailed in the appended claims.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0029] It should be understood that although the terms first, second, third, etc. may be used to describe various information in the embodiments of the present application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the embodiments of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein may be interpreted as "at the time of" or "when" or "in response to a determination."

[0030] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limiting the present application.

[0031] It should be noted that the energy storage flywheel braking device provided in any embodiment of the present application can be implemented alone, or in combination with possible implementation methods in other embodiments, or in combination with any technical solution in related technologies.

[0032] The energy storage flywheel braking method and device thereof according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0033] Figure 1 This is a schematic diagram of the structure of an energy storage flywheel brake device provided in an embodiment of the present application. Figure 1 As shown, the energy storage flywheel brake device is suitable for an energy storage flywheel system, which includes: a first converter, a second converter, a brake module and an energy storage flywheel unit, wherein the input end of the first converter is connected to the grid bus, wherein the first converter can be an energy storage converter (also known as an energy storage inverter, the full name of which is Power Conversion The invention relates to a flywheel energy storage system (EPS) comprising a first end of a braking module connected to an output end of a first converter, wherein the braking module is responsible for safely and effectively controlling the speed of the flywheel in the energy storage flywheel system when necessary to achieve energy storage and release; an input end of a second converter is connected to a second end of the braking module and an output end of the first converter, wherein the second converter can also be an energy storage converter; an energy storage flywheel unit is connected to the output end of the second converter, wherein the energy storage flywheel unit is also called a flywheel energy storage unit, which uses an electric motor to drive the flywheel to rotate at high speed, converts electrical energy into mechanical energy for storage, and drives a generator to generate electricity when needed, thereby converting the mechanical energy into electrical energy for output.

[0034] like Figure 1 As shown, the energy storage flywheel braking device includes but is not limited to the following modules:

[0035] The detection module is connected to the output end of the second converter and is used to detect the real-time voltage of the energy storage flywheel unit. It should be noted that the real-time voltage is the AC voltage on the machine side of the energy storage flywheel unit. It is usually necessary to filter the AC voltage to remove the ripples between the positive and negative half-cycles to ensure the stability of the voltage signal. Next, the filtered AC voltage is converted into a DC voltage. This is achieved through a rectifier component. The rectifier component can reverse the negative half-cycle of the AC voltage to make it positive, thereby obtaining a unidirectional DC voltage. After rectification, the voltage needs to be stabilized to ensure the accuracy of the measurement. This can be achieved through a voltage stabilizing component. The voltage stabilizing component can ensure that the voltage remains constant within a certain range to avoid the influence of voltage fluctuations on the measurement results. After voltage stabilization, the voltage is usually maintained within a certain range for subsequent display and reading.

[0036] Figure 2 Schematic diagram of the structure of a detection module provided according to an embodiment of the present application. Figure 2 As shown, the detection module includes a step-down unit, a peak holding unit and an analog-to-digital conversion unit, wherein the step-down unit is connected to the output end of the second converter; the peak holding unit is connected to the step-down unit; and the analog-to-digital conversion unit is connected to the peak holding unit.

[0037] It should be noted that if Figure 2 As shown, the step-down unit can reduce the high voltage generated by the second converter to the required low voltage level. As an example, the step-down unit may include a rectifier component, a power converter, a control circuit, a filter, etc., wherein the internal structure of the step-down unit is not shown in FIG. Figure 2 Furthermore, the rectifier component of the step-down unit is used to obtain a unidirectional DC voltage. The power converter is responsible for converting high voltage into low voltage to achieve precise voltage control and conversion; the power converter can use insulated gate bipolar transistors or silicon carbide. The control circuit is used to detect and adjust the operating status of the power converter to ensure stable voltage output; the control circuit can include various sensors, microprocessors and communication interfaces to achieve intelligent management and remote control. The filter is used to eliminate ripple and noise at the output of the power converter and improve the purity and stability of the voltage; the filter can include components such as inductors, capacitors and resistors, and can also be set using a dedicated integrated circuit.

[0038] It should be noted that the internal structure of the peak hold unit is not Figure 2The peak holding unit is a circuit structure and function to capture and hold the peak value of the input signal. When the input signal reaches its peak value, the peak holding unit will respond quickly and save the peak value, even if the input signal drops or changes afterwards, the saved peak value will not change until it is reset or a new peak value appears. As an example, the peak holding unit can be composed of a comparison subunit, a selection isolation subunit, a holding subunit and a gate subunit. The comparison subunit generates a signal synchronized with the input signal to be held as the input signal of the gate subunit; the selection isolation subunit realizes the acquisition of the input signal, prevents the accumulation of noise signals, and isolates the front-end elements; the holding subunit can use a negative feedback circuit to ensure the linear relationship between the peak signal and the input signal; the gate subunit can form two signals, the first signal is output to the selection isolation subunit to control the selection isolation subunit, and the second signal is output to the holding subunit to realize the peak holding operation.

[0039] It should be noted that the internal structure of the analog-to-digital conversion unit is not shown in the Figure 2 The analog-to-digital conversion unit is used to convert continuous analog signals into discrete digital signals for processing and storage by the control module.

[0040] It should be further noted that the detection module can also be set in the form of a power management chip, an application specific integrated circuit (Application Specific Integrated Circuit, ASIC for short, ASIC is a special application chip designed for specific user requirements and specific system) and the like. The specific setting form is not described here, as long as it can detect the real-time voltage of the energy storage flywheel unit, any detection module setting form is used, and it is not limited to this embodiment.

[0041] As shown in Figure 1 , the energy storage flywheel braking device further comprises a control module connected with the detection module, the third end of the braking module, the output end of the second converter and the output end of the first converter. By following the change of the real-time voltage, a corresponding control signal is generated, and based on the control signal, the braking mode and braking speed of the energy storage flywheel system are adjusted, wherein if the real-time voltage ≥ the threshold voltage set by the energy storage flywheel unit, the control signal makes the energy storage flywheel system work in the alternating current braking mode; if the real-time voltage < the threshold voltage set by the energy storage flywheel unit, the control signal makes the energy storage flywheel system work in the direct current braking mode.

[0042] Optionally, as an example, as shown in Figure 1 , the control module comprises an auxiliary braking unit, a switching unit and a regulation unit, wherein:

[0043] The regulating unit is connected with the detection module, the auxiliary braking unit is connected with the regulating unit and the output end of the first converter, and the regulating unit adjusts the control signal output by the auxiliary braking unit based on the change condition of the real-time voltage. It should be noted that the control signal is generated by the auxiliary braking unit. The switching unit and the third end of the braking module and the output end of the second converter adjust the braking mode and braking speed of the energy storage flywheel system based on the control signal, wherein:

[0044] If the switching unit is open, the energy storage flywheel system works in the direct-current braking mode; if the switching unit is closed, the energy storage flywheel system works in the alternating-current braking mode.

[0045] If the energy storage flywheel system works in the alternating-current braking mode, the corresponding control signal is generated by adjusting the output voltage of the auxiliary braking unit, and the braking speed of the energy storage flywheel system is adjusted based on the control signal; if the energy storage flywheel system works in the direct-current braking mode, if the voltage of the output end of the second converter decreases, the energy storage flywheel system continues to work in the direct-current braking mode, and if the voltage of the output end of the second converter does not decrease, the energy storage flywheel system is switched from the direct-current braking mode to the alternating-current braking mode.

[0046] Further, as shown in Figure 1 , the switching unit includes three controllable switches, wherein the first controllable switch is connected with the first output end of the second converter and the third end of the braking module; the second controllable switch is connected with the second output end of the second converter and the third end of the braking module; and the third controllable switch is connected with the third output end of the second converter and the third end of the braking module. Since the second converter outputs three-phase alternating current, under normal circumstances, the three controllable switches are synchronously actuated when the direct-current braking mode and the alternating-current braking mode are switched. If the three controllable switches are all closed, the energy storage flywheel system works in the alternating-current braking mode; if the three controllable switches are all open, the energy storage flywheel system works in the direct-current braking mode. It should be noted that the controllable switch can be set by using a MOS switch tube or a relay, and the setting form of the controllable switch should be selected according to the specific use scene, which will not be described here.

[0047] Figure 3 is a structural schematic diagram of an auxiliary braking unit according to an embodiment of the present application. Further, as shown in Figure 1 and Figure 3 , the auxiliary braking unit includes a braking switch and three resistance sub-units, wherein the first end of the braking switch (i.e. the node o in Figure 1 and Figure 3 ) is connected with the output end of the first converter; the first end of the first resistance sub-unit (i.e. the node a in Figure 1 and Figure 3the node c) in the figure is connected with the first controllable switch, the second end of the first resistance subunit is connected with the second end of the brake switch; the first end of the second resistance subunit (i.e. Figure 1 and Figure 3 the node b) in the figure is connected with the second controllable switch, the second end of the second resistance subunit is connected with the second end of the brake switch; the first end of the third resistance subunit (i.e. Figure 1 and Figure 3 the node a) in the figure is connected with the third controllable switch, the second end of the third resistance subunit is connected with the second end of the brake switch. Wherein, if the brake switch is closed, the three resistance subunits make the energy storage flywheel system work in the direct current braking mode; if the brake switch is opened, the three resistance subunits make the energy storage flywheel system work in the alternating current braking mode.

[0048] Figure 4 is a structural schematic diagram of a resistance subunit according to the embodiment provided by the present application. Further, as shown in Figure 4 the resistance subunit includes an adjustable resistance, wherein in the alternating current braking mode, the braking speed of the energy storage flywheel system is controlled by adjusting the resistance value of the resistance subunit; the resistance subunit includes n resistors (n is a positive integer greater than 1) and a plurality of switches, the connection relationship of the resistors and the switches is set according to the actual use scene, and the series-parallel relationship of the n resistors is changed by adjusting the opening and closing of the switches. As an example, the resistance subunit includes five resistors and six switches, which are a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first switch k1, a second switch k2, a third switch k3, a fourth switch k4, a fifth switch k5 and a sixth switch k6, wherein the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are connected in series; the first switch k1 is connected in parallel with the fifth resistor R5; the second switch k2 is connected in parallel with the fourth resistor R4 and the fifth resistor R5; the third switch k3 is connected in parallel with the third resistor R3, the fourth resistor R4 and the fifth resistor R5; the fourth switch k4 is connected in parallel with the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5; the fifth switch k5 is connected in parallel with the first resistor R1 and the second resistor R2; and the sixth switch k6 is connected in parallel with the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4.

[0049] If the energy storage flywheel system works in the direct current braking mode, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are connected in series, and the first switch k1, the second switch k2, the third switch k3, the fourth switch k4, the fifth switch k5 and the sixth switch k6 are all opened.

[0050] If the energy storage flywheel system works in the alternating current braking mode, as Figure 1The output voltage of the second converter is reduced, the connection relationship of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 is changed by adjusting the open and closed states of the first switch k1, the second switch k2, the third switch k3, the fourth switch k4, the fifth switch k5 and the sixth switch k6, thereby changing the resistance value of the resistance subunit as a whole, and further adjusting the output voltage of the auxiliary braking unit to generate a corresponding control signal, and adjusting the braking speed of the energy storage flywheel system based on the control signal.

[0051] As an example, in the starting state, the first switch k1, the second switch k2, the third switch k3, the fourth switch k4, the fifth switch k5 and the sixth switch k6 are all open; if it is necessary to reduce the resistance value of the resistance subunit as a whole, the first switch k1 can be closed first, at this time the resistance value of the resistance subunit is equal to the sum of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4; then the second switch k2 is closed, at this time the resistance value of the resistance subunit is equal to the sum of the first resistor R1, the second resistor R2 and the third resistor R3; then the third switch k3 is closed, at this time the resistance value of the resistance subunit is equal to the sum of the first resistor R1 and the second resistor R2; then the fourth switch k4 is closed, at this time the resistance value of the resistance subunit is equal to the first resistor R1; then the first switch k1, the second switch k2 and the third switch k3 are all open, at this time the resistance value of the resistance subunit is equal to the resistance value of the first resistor R1 in parallel with the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5; then the fifth switch k5 is closed, at this time the resistance value of the resistance subunit is equal to the resistance value of the first resistor R1 in parallel with the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5; then the second switch k2 is closed, at this time the resistance value of the resistance subunit is equal to the resistance value of the first resistor R1 in parallel with the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5; then the sixth switch k6 is closed, at this time the resistance value of the resistance subunit is equal to the resistance value of the first resistor R1 in parallel with the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5.

[0052] As shown in Figure 1 The braking power of the energy storage flywheel system (i.e. the power of the braking module) is equal to the square of the output voltage of the second converter and the ratio of the resistance of the auxiliary braking unit. If the energy storage flywheel system works in the alternating current braking mode, as the output voltage of the second converter decreases, the resistance value of the auxiliary braking unit is changed to ensure that the braking power does not decrease, thereby achieving rapid braking of the energy storage flywheel unit.

[0053] If the energy storage flywheel system works in the DC braking mode (the switch unit is disconnected), if the output voltage of the second converter does not decrease or decreases not obviously, it indicates that the speed of the energy storage flywheel unit does not change, resulting in that the effect of the DC braking is not obvious. The energy storage flywheel system can be switched from the DC braking mode to the AC braking mode by adjusting the switch unit to be closed, and the braking speed of the energy storage flywheel unit is adjusted by changing the resistance value of the auxiliary braking unit in the control module under the premise that the braking power does not decrease.

[0054] It should be noted that the control module can also be set in the form of an application-specific integrated circuit, and the specific setting form will not be described here. As long as the control module can generate a corresponding control signal following the change of the real-time voltage, and adjust the braking mode and the braking speed of the energy storage flywheel system based on the control signal, any setting form of the control module is used, and the embodiment is not limited.

[0055] In summary, the control module follows the change of the real-time voltage of the energy storage flywheel unit, compares the real-time voltage with the threshold voltage set for the energy storage flywheel unit, generates a corresponding control signal according to the comparison result, and improves the switching efficiency and accuracy between the DC braking mode and the AC control mode of the energy storage flywheel system according to the control signal and in combination with the remote braking scene and the alarm signal of the energy storage flywheel unit, greatly improves the braking efficiency of the energy storage flywheel system, and has wide applicability.

[0056] Figure 5 A flowchart of a braking method of an energy storage flywheel provided in an embodiment of the present application is shown in FIG. 5. Figure 5 As shown in FIG. 5, the method is applicable to the energy storage flywheel braking device provided in the embodiment of the present application, and the method includes but is not limited to the following steps:

[0057] S501, obtaining the back electromotive force of the energy storage flywheel unit.

[0058] For specific introduction of step S501, reference can be made to the description of the related content in the above embodiment, which will not be described here.

[0059] S502, determining a corresponding braking strategy according to the comparison operation of the voltage threshold set for the energy storage flywheel braking device and the back electromotive force.

[0060] In a feasible implementation, if the value of the back electromotive force is greater than or equal to the voltage threshold, the AC braking mode is executed for the energy storage flywheel system;

[0061] If the value of the back electromotive force is less than the voltage threshold, if the energy storage flywheel unit does not issue an alarm signal and there is no remote braking scene, no braking operation is performed for the energy storage flywheel system;

[0062] If the value of back electromotive force is less than the voltage threshold value, if the energy storage flywheel unit does not issue an alarm signal, and there is a remote braking scenario, the direct current braking mode is executed on the energy storage flywheel system;

[0063] If the value of back electromotive force is less than the voltage threshold value, if the energy storage flywheel unit issues an alarm signal, the direct current braking mode is executed on the energy storage flywheel system.

[0064] The remote braking scenario is a scenario in which a remote communication technology controls the braking of the energy storage flywheel unit, which is set by the braking signal management system of the energy storage flywheel unit. Specifically, it can be set by introducing multi-level monitoring and multi-level braking modes. The multi-level braking mode can include remote control, system control, and self-emergency braking. Through the multi-level braking mode, the over-speed and other dangerous conditions of the energy storage flywheel unit can be effectively monitored, and the purpose is to reduce the risk of accidents. If the real-time voltage detected by the detection module is abnormal, braking can be performed based on the multi-level braking mode.

[0065] Further, in response to the energy storage flywheel system executing the alternating current braking, the resistance value of each resistance sub-unit in the auxiliary braking unit is adjusted to obtain the real-time power of the energy storage flywheel unit;

[0066] If the real-time power is less than the power threshold value set by the energy storage flywheel unit, the alternating current braking mode continues to be executed on the energy storage flywheel system until the braking operation is completed.

[0067] If the real-time power is greater than or equal to the power threshold value set by the energy storage flywheel unit, the resistance value of each resistance sub-unit in the auxiliary braking unit is continuously adjusted until the real-time power is less than the power threshold value set by the energy storage flywheel unit.

[0068] Further, in response to the energy storage flywheel system executing the direct current braking mode, the voltage drop rate of the energy storage flywheel unit is obtained;

[0069] If the voltage drop rate is greater than or equal to the voltage drop rate threshold value set by the energy storage flywheel unit, the direct current braking mode continues to be executed on the energy storage flywheel system until the braking operation is completed.

[0070] If the voltage drop rate is less than the voltage drop rate threshold value set by the energy storage flywheel unit, the energy storage flywheel system is switched from the direct current braking mode to the alternating current braking mode.

[0071] If the energy storage flywheel system works in the alternating current braking mode, as the output voltage of the second converter decreases, the resistance value of the auxiliary braking unit is changed to ensure that the braking power does not decrease, thereby achieving rapid braking of the energy storage flywheel unit. For the adjustment operation of the resistance value of the auxiliary braking unit, reference can be made to the description of the related content in the above embodiments, which will not be repeated here.

[0072] S503, according to the braking strategy, the energy storage flywheel system is braked.

[0073] For details of step S503, please refer to the description of the related content in the above embodiments, which will not be repeated here.

[0074] In summary, by controlling the change of the real-time voltage of the energy storage flywheel unit, the real-time voltage is compared with the threshold voltage set by the energy storage flywheel unit. According to the comparison result, the corresponding control signal is generated. According to the control signal, combined with the remote braking scene and the alarm signal of the energy storage flywheel unit, the switching efficiency and accuracy between the DC braking mode and the AC control mode of the energy storage flywheel system are improved, which greatly improves the braking efficiency of the energy storage flywheel system, and has wide applicability.

[0075] Figure 6 is a block diagram of an electronic device according to an example embodiment. Figure 6 The electronic device shown is merely an example and should not impose any limitation on the functions and use range of the embodiments of the present application.

[0076] As shown in Figure 6 , the electronic device 600 includes a processor 601, which can perform various appropriate actions and processes according to programs stored in a read-only memory (ROM) 602 or loaded from a storage 606 into a random access memory (RAM) 603. In the RAM 603, various programs and data required for the operation of the electronic device 600 are also stored. The processor 601, the ROM 602, and the RAM 603 are connected to each other through a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0077] The following components are connected to the I / O interface 605: the storage 606 including a hard disk or the like; and a communication section 607 including a network interface card such as a LAN (Local Area Network) card, a modem, or the like, which performs communication processing via a network such as the Internet; and a drive 608 is also connected to the I / O interface 605 as needed.

[0078] In particular, according to the embodiments of the present application, the processes described above with reference to the flowcharts can be implemented as a computer software program. For example, the embodiments of the present application include a computer program carried on a computer readable medium, which contains program codes for executing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network by the communication section 607. When the computer program is executed by the processor 601, the above-mentioned functions defined in the methods of the present application are performed.

[0079] In an example embodiment, a storage medium including instructions, for example, a memory including instructions, is also provided, which can be executed by the processor 601 of the electronic device 600 to complete the above method. Optionally, the storage medium can be a non-transitory computer-readable storage medium, for example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0080] In the present application, the computer readable storage medium can be any tangible medium that contains or stores a program for use by or in connection with an instruction execution system, apparatus, or device. In the present application, the computer readable signal medium can include a data signal carrying computer readable program code in a baseband or as part of a carrier wave. Such a propagated data signal can take any of a variety of forms, including but not limited to electro-magnetic, optical, or any suitable combination thereof. The computer readable signal medium can also be any computer readable medium that is not a storage medium and that can communicate, propagate or transport program for use by or in connection with an instruction execution system, apparatus, or device. Program code contained on a computer readable medium can be transmitted using any appropriate medium, including but not limited to wireless, wire line, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0081] Figure 7 is a structural block diagram of an electronic device according to an example embodiment. Figure 7 The electronic device shown is only an example and should not bring any limitation to the function and use range of the embodiments of the present application. As Figure 7 As shown, the electronic device 700 includes a processor 701 and a memory 702. The memory 702 is used to store program code, and the processor 701 is connected with the memory 702 and used to read the program code from the memory 702 to realize the energy storage flywheel braking method in the above embodiments.

[0082] Optionally, the number of processors 701 can be one or more.

[0083] Optionally, the electronic device can also include an interface 703, and the number of the interface 703 can be multiple. The interface 703 can be connected with an application program and can receive data of an external device such as a sensor, etc.

[0084] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0085] It is to be understood that the application is not limited to the precise construction herein disclosed and shown in the drawings, and that various changes in shape, size and arrangements of parts can be made without departing from the scope of the application. The scope of the application is limited only by the claims that follow.

Claims

1. An energy storage flywheel brake device, characterized in that: Applicable to an energy storage flywheel system, the energy storage flywheel system includes: a first converter, a second converter, a brake module and an energy storage flywheel unit, the input end of the first converter is connected to the grid bus; the first end of the brake module is connected to the output end of the first converter; the input end of the second converter is connected to the second end of the brake module and the output end of the first converter; the energy storage flywheel unit is connected to the output end of the second converter; including: A detection module for detecting the real-time voltage of the energy storage flywheel unit, and a control module for adjusting the braking mode and braking speed of the energy storage flywheel system; The control module generates a control signal for adjusting the braking mode and braking speed of the energy storage flywheel system according to the change of the real-time voltage, and includes a control unit; an auxiliary braking unit connected to the control unit and the first converter; a switch unit connected to the third end of the braking module, the auxiliary braking unit and the output end of the second converter, and adjusting the braking mode of the energy storage flywheel system; Among them, if the switch unit is disconnected, the energy storage flywheel system is in DC braking mode; if the switch unit is closed, the energy storage flywheel system is in AC braking mode; if the energy storage flywheel system is in AC braking mode, the output voltage of the auxiliary braking unit is adjusted to generate a control signal for the braking speed of the energy storage flywheel system; if the energy storage flywheel system is in DC braking mode and the output voltage of the second converter drops, the energy storage flywheel system maintains the DC braking mode, if the output voltage of the second converter does not drop, the energy storage flywheel system is adjusted to the AC braking mode; the auxiliary braking unit includes a braking switch and three resistor sub-units, if the braking switch is closed, each resistor sub-unit controls the energy storage flywheel system to be in DC braking mode; if the braking switch is disconnected, each resistor sub-unit controls the energy storage flywheel system to be in AC braking mode; the resistor sub-unit includes an adjustable resistor, in the AC braking mode, the braking speed of the energy storage flywheel system is adjusted according to the resistance value; Among them, if the real-time voltage is greater than or equal to the threshold voltage set by the energy storage flywheel unit, the braking mode control signal causes the energy storage flywheel system to operate in the AC braking mode; if the real-time voltage is less than the threshold voltage set by the energy storage flywheel unit, the braking mode control signal causes the energy storage flywheel system to operate in the DC braking mode.

2. The device according to claim 1, characterized in that The detection module includes a step-down unit, a peak holding unit and an analog-to-digital conversion unit, wherein the step-down unit is connected to the output end of the second converter; the peak holding unit is connected to the step-down unit; and the analog-to-digital conversion unit is connected to the peak holding unit.

3. The device according to claim 1, characterized in that The switch unit includes three controllable switches, wherein the first controllable switch is connected to the first output end of the second converter and the third end of the braking module; the second controllable switch is connected to the second output end of the second converter and the third end of the braking module; and the third controllable switch is connected to the third output end of the second converter and the third end of the braking module.

4. A method for braking an energy storage flywheel, characterized in that: An energy storage flywheel brake device suitable for use in any one of claims 1 to 3, comprising: Obtain the real-time voltage of the energy storage flywheel unit; Determining a corresponding braking strategy based on a comparison operation between a threshold voltage set by the energy storage flywheel braking device and the real-time voltage; According to the braking strategy, a braking operation is performed on the energy storage flywheel system.

5. The method according to claim 4, characterized in that The determining of a corresponding braking strategy based on a comparison operation between a threshold voltage set by the energy storage flywheel braking device and the real-time voltage includes: If the real-time voltage is greater than or equal to the threshold voltage, executing an AC braking mode on the energy storage flywheel system; If the real-time voltage is less than the threshold voltage, if the energy storage flywheel unit does not send an alarm signal and there is no remote braking scenario, no braking operation is performed on the energy storage flywheel system; If the real-time voltage is less than the threshold voltage, if the energy storage flywheel unit does not send an alarm signal and there is a remote braking scenario, a DC braking mode is executed on the energy storage flywheel system; If the real-time voltage is less than the threshold voltage, and the energy storage flywheel unit issues an alarm signal, a DC braking mode is executed on the energy storage flywheel system.

6. The method according to claim 5, characterized in that The method of executing the AC braking mode on the energy storage flywheel system includes: In response to the energy storage flywheel system performing AC braking, the resistance value of each resistor sub-unit in the auxiliary braking unit is adjusted to obtain the real-time power of the energy storage flywheel unit; If the real-time power is less than the power threshold set by the energy storage flywheel unit, continue to perform the AC braking mode on the energy storage flywheel system until the braking operation is completed; If the real-time power is greater than or equal to the power threshold set by the energy storage flywheel unit, the resistance value of each resistor sub-unit in the auxiliary braking unit is continuously adjusted until the real-time power is less than the power threshold set by the energy storage flywheel unit.

7. The method according to claim 5, characterized in that The method of executing a DC braking mode on the energy storage flywheel system includes: In response to the energy storage flywheel system executing a DC braking mode, obtaining a voltage drop rate of the energy storage flywheel unit; If the voltage drop rate is greater than or equal to the voltage drop rate threshold set by the energy storage flywheel unit, continue to perform the DC braking mode on the energy storage flywheel system until the braking operation is completed; If the voltage drop rate is less than the voltage drop rate threshold set by the energy storage flywheel unit, the energy storage flywheel system is switched from the DC braking mode to the AC braking mode.

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