CN115693861A - A braking electric energy recovery system and method - Google Patents

Abstract

The present invention provides a system and method for recovering braking electric energy. The system includes: equipment for generating braking electric energy during braking; a DC common bus connected to a frequency converter of the equipment, wherein the After braking the electric energy, the frequency converter of the device transmits the braking electric energy to the DC common bus; the power recovery unit is connected to the DC common bus and is used to recover the electric energy on the DC common bus. It solves the technical problem of directly feeding back the braking electric energy to the power grid in the prior art, which affects the quality of the power grid.

Description

A braking electric energy recovery system and method

technical field

The present application relates to the field of braking electric energy recovery, in particular, to a braking electric energy recovery system and method.

Background technique

With the development of the "inspection, storage and distribution" integrated base, more and more automated three-dimensional warehouses will be put into construction and use. "Energy saving and consumption reduction" has also begun to be included in the development requirements, and equipment braking energy recovery is the development direction to realize this requirement.

It should be noted that the braking energy recovery of the existing equipment often transmits the braking electric energy to the DC bus or directly feeds it back to the power grid. When the voltage of the DC bus is too high, it will affect the normal operation of the equipment or cause the equipment to burn out. However, directly feeding the braking electric energy back to the grid will affect the quality of the grid due to the quality of the electric energy.

In view of this, the present invention is proposed.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned technical deficiencies, and provide a braking electric energy recovery system and method to solve the technical problem in the prior art that the braking electric energy is directly fed back to the grid, which affects the quality of the grid.

According to the first aspect of the present invention, there is provided a braking electric energy recovery system, including: equipment used to generate braking electric energy during braking; a DC common bus connected to the frequency converter of the equipment, wherein, in the After the equipment generates braking electric energy, the frequency converter of the equipment transmits the braking electric energy to the DC common bus; the power recovery unit is connected to the DC common bus and is used to recover the electric energy on the DC common bus.

Further, when the voltage on the DC common bus exceeds a preset voltage, the power recovery unit recovers the electric energy on the DC common bus.

Further, the electric energy recovery unit is further configured to transmit electric energy to the direct current common bus under the condition that the voltage on the direct current common bus does not exceed a preset voltage.

Further, the electric energy storage capacity of the electric energy recovery unit is associated with the braking power of the device.

Further, there are multiple devices, and the first device is any one of the multiple devices, wherein the first device is used to receive data transmitted from the DC common bus to the DC common bus by other devices. braking power.

Further, the device is a stacker.

According to the second aspect of the present invention, there is provided a method for recovering braking electric energy, including: detecting that the voltage on a DC common bus exceeds a preset voltage, wherein the DC common bus is connected to a frequency converter of a device, wherein, When the device generates braking electric energy, the device transmits the braking electric energy to the DC common bus through the frequency converter; controls to transmit the electric energy on the DC common bus to the power recovery unit for storage.

Further, there are multiple devices, and the first device is any one of the multiple devices, wherein the method includes: when it is detected that the first device is in a power-on state, controlling the The electric energy on the direct current bus is transmitted to the first device.

Further, the method further includes: adjusting the storage capacity of the electric energy recovery unit according to the braking power of the equipment.

Further, the device is a stacker, wherein generating the braking power of the device includes: converting the obtained moment of inertia of the motor of the stacker and the moment of inertia of the motor load to the moment of inertia on the motor side, The speed before braking of the stacker, the speed after braking, the deceleration time and the load torque determine the braking torque of the stacker; based on the braking torque and the rated speed of the motor of the stacker, the obtained The braking power of the above equipment.

The present invention provides a braking electric energy recovery system and method. The system includes: equipment for generating braking electric energy during braking; a DC common bus connected to a frequency converter of the equipment, wherein the After braking the electric energy, the frequency converter of the device transmits the braking electric energy to the DC common bus; the power recovery unit is connected to the DC common bus and is used to recover the electric energy on the DC common bus. The technical problem of directly feeding back the braking electric energy to the power grid in the prior art is solved, which affects the quality of the power grid.

Description of drawings

FIG. 1 is a schematic diagram of a braking electric energy recovery system according to an embodiment of the present application;

2 to 3 are schematic diagrams showing the effect of a braking electric energy recovery system according to an embodiment of the present application;

Fig. 4 is a schematic diagram of a method for recovering braking electric energy according to an embodiment of the present application.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

Embodiment one

This application provides a braking electric energy recovery system, as shown in Figure 1, the system includes:

Device 10 for generating braking electrical energy during braking.

Specifically, in this solution, the above-mentioned equipment can be a stacker and other equipment that can generate braking electric energy. More specifically, the above-mentioned equipment can be a plurality of drive units in a stacker working in an intelligent warehouse (such as Motor), the motor will generate braking electric energy in the case of braking.

The DC common bus 12 is connected to the frequency converter of the equipment, wherein, after the equipment generates braking electric energy, the frequency converter of the equipment transmits the braking electric energy to the DC common bus.

Specifically, in this solution, there can be multiple devices, and the DC buses of the frequency converters of multiple devices can be connected together to form the above-mentioned DC common bus. The kinetic energy is transmitted directly to the DC common bus.

The electric energy recovery unit 14 is connected with the DC common bus, and is used for recovering the electric energy on the DC common bus.

Specifically, the above electric energy recovery unit may be a battery, and this solution can control the transmission of electric energy on the DC common bus to the battery, so as to realize charging of the battery.

What needs to be explained here is that this solution is different from the existing technology that directly feeds the braking power back to the grid, but transmits it to the battery for power storage, and the power stored in the battery can be used by the equipment later. Kinetic energy does not return to the grid", which can bring substantial benefits to the enterprise and save energy. This solution solves the technical problem of directly feeding the braking electric energy back to the grid in the prior art, which affects the quality of the grid.

Optionally, when the voltage on the DC common bus exceeds a preset voltage, the electric energy recovery unit recovers the electric energy on the DC common bus.

Specifically, the preset voltage may be 570v. When the voltage on the DC common bus exceeds the preset voltage, the IGBT element in the battery is turned on, and the battery is charged in this solution. Optionally, this solution can charge the battery through DCDC two-level change and 570v-300-48v. Through this embodiment, when the voltage of the DC bus is too high, the solution can charge the battery in time, reduce the voltage of the DC bus in time, and recover and release electric energy.

Optionally, the power recovery unit is further configured to transmit electric energy to the DC common bus when the voltage on the DC common bus does not exceed a preset voltage.

Specifically, when the DC bus voltage is lower than 570V and the battery has a certain amount of power, this solution can control the battery to charge the DC bus through 48-300-570V to achieve the purpose of potential energy recovery and reuse. The energy generated during operation achieves the effect of energy-saving technology.

Combined with Figure 2, when the lifting system of the stacker is braking, the voltage of the DC common bus will rise, and when the lifting system operates in electric mode, the voltage of the DC common bus will drop.

Optionally, the electric energy storage capacity of the electric energy recovery unit is associated with the braking power of the device.

Specifically, this solution can adjust the storage capacity of the battery according to the braking power of the equipment, so as to improve the utilization rate of the battery capacity.

Optionally, there are a plurality of devices, and the first device is any one of the plurality of devices, wherein the first device is used to receive data from the DC common bus that other devices transmit to the DC common bus. braking power.

Specifically, the above-mentioned first device may be a drive unit (drive) of a stacker, and when the first device needs power, it may receive the drive from other devices from the DC common bus to the DC common bus. Kinetic electric energy, what needs to be explained here is that the above-mentioned first device can be in the power consumption mode, and the above-mentioned other devices can be in the power generation mode, and the braking energy generated by a frequency converter working in the power generation mode can be generated by another inverter running in the electric mode. The frequency converter is used to effectively realize energy saving. It can be seen from Figure 3 that when one inverter operates in electric mode and the other inverter operates in power generation mode, it can be seen from the power of the two drives (drive units) that no grid power is consumed at this time , which is equivalent to saving energy.

Embodiment two

The present application also provides a method for recovering braking electric energy, as shown in Figure 4, the method includes:

Step S40, detecting that the voltage on the DC common bus exceeds a preset voltage, wherein the DC common bus is connected to the frequency converter of the equipment, wherein when the equipment generates braking electric energy, the equipment passes through the frequency converter The braking electric energy is transmitted to the DC common bus.

Step S42, controlling to transmit the electric energy on the DC common bus to the electric energy recovery unit for storage.

Specifically, the above-mentioned equipment can be a stacker and other equipment that can generate braking electric energy. More specifically, the above-mentioned equipment can be a plurality of drive units (such as motors) in a stacker working in an intelligent warehouse. In the case of braking, braking electric energy will be generated. There can be multiple devices. The DC buses of the frequency converters of multiple devices can be connected together to form the above-mentioned DC common bus. After any one device brakes, the frequency converter of the device The braking electric energy is then generated and transmitted directly to the DC common bus.

The above electric energy recovery unit may be a battery, and this solution can control the transmission of electric energy on the DC common bus to the battery, so as to realize charging of the battery.

What needs to be explained here is that this solution is different from the existing technology that directly feeds the braking power back to the grid, but transmits it to the battery for power storage, and the power stored in the battery can be used by the equipment later. Kinetic energy does not return to the grid", which can bring substantial benefits to the enterprise and save energy. This solution solves the technical problem of directly feeding the braking electric energy back to the grid in the prior art, which affects the quality of the grid.

Optionally, there are multiple devices, and the first device is any one of the multiple devices, wherein the method further includes:

When it is detected that the first device is in a power-on state, control to transmit the electric energy on the direct current bus to the first device.

The above-mentioned first device can be a drive unit (drive) of the stacker, and when the first device needs power, it can receive the braking electric energy transmitted from other devices to the DC common bus from the DC common bus, What needs to be explained here is that the above-mentioned first device can be in the power consumption mode, and the above-mentioned other devices are in the power generation mode, that is, through this scheme, because the braking energy generated by one inverter working in the It is used by frequency converters operating in the same mode, which effectively realizes energy saving.

Optionally, the method also includes:

The storage capacity of the electric energy recovery unit is adjusted according to the braking power of the equipment.

Specifically, in this solution, the storage capacity of the electric energy recovery unit can be adjusted in advance according to the braking power of the equipment, so as to improve the utilization effect of the battery.

Optionally, the device is a stacker, wherein generating the braking power of the device includes:

Determine the stacker according to the acquired motor moment of inertia of the stacker, the motor load moment of inertia converted to the motor side, the speed before braking, the speed after braking, the deceleration time and the load torque of the stacker braking torque;

The braking power of the device is obtained based on the braking torque and the rated rotational speed of the motor of the stacker.

Specifically, this solution can calculate the braking torque T of the equipment through the following formula:

T=(J+J negative)*(V1-V2))/375*t1-T negative, where J is the moment of inertia of the motor; J negative is the moment of inertia converted from the moment of inertia of the motor load to the motor side; V1 is the brake V2 is the speed after braking; t1 is the deceleration time; T negative is the load torque.

In this scheme, the braking power P of the equipment can be calculated by the following formula:

P=2π*T*n/60/1000, where T is the braking torque and n is the rated speed.

The present application also provides an electronic device, including: a processor and a memory; a computer-readable program that can be executed by the processor is stored on the memory; when the processor executes the computer-readable program, the following The steps in the method described in any one of the first embodiment.

The present application also provides a computer-readable storage medium, where one or more programs are stored in the computer-readable storage medium, and the one or more programs can be executed by one or more processors, so as to realize the A step in any one of the described methods.

It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

Optionally, for specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments, and details are not repeated in this embodiment.

Optionally, in this embodiment, the above-mentioned storage medium may include but not limited to: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random AccessMemory), mobile hard disk, magnetic disk Various media that can store program codes such as discs or optical discs.

The serial numbers of the above embodiments of the present application are for description only, and do not represent the advantages and disadvantages of the embodiments.

If the integrated units in the above embodiments are realized in the form of software function units and sold or used as independent products, they can be stored in the above computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or part of the contribution to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium. Several instructions are included to make one or more computer devices (which may be personal computers, servers or network devices, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.

In the above-mentioned embodiments of the present application, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. Wherein, the device embodiments described above are only illustrative, for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components can be combined or can be Integrate into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of units or modules may be in electrical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

The above description is only the preferred embodiment of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, some improvements and modifications can also be made. These improvements and modifications are also It should be regarded as the protection scope of this application.

Claims (10)

1. A braking electric energy recovery system, characterized in that it comprises: equipment for generating braking electrical energy during braking; The DC common bus is connected to the frequency converter of the equipment, wherein, after the equipment generates braking electric energy, the frequency converter of the equipment transmits the braking electric energy to the DC common bus; The electric energy recovery unit is connected with the DC common bus and is used for recovering the electric energy on the DC common bus. 2 . The system according to claim 1 , wherein when the voltage on the DC common bus exceeds a preset voltage, the electric energy recovery unit recovers the electric energy on the DC common bus. 3 . 3. The system according to claim 1, wherein the electric energy recovery unit is further configured to transmit electric energy to the direct current common bus when the voltage on the direct current common bus does not exceed a preset voltage. 4. The system of claim 1, wherein the electrical energy storage capacity of the electrical energy recovery unit is associated with the braking power of the device. 5. The system according to claim 1, wherein there are multiple devices, and the first device is any one of the multiple devices, wherein the first device is used to receive to the braking electric energy transmitted to the DC common bus by other equipment. 6. The system of claim 1, wherein the device is a stacker. 7. A method for recovering braking electric energy, comprising: It is detected that the voltage on the DC common bus exceeds a preset voltage, wherein the DC common bus is connected to the frequency converter of the equipment, wherein when the equipment generates braking electric energy, the equipment will brake through the frequency converter transmission of electric energy to the DC common bus; The electric energy on the DC common bus is controlled to be transmitted to the electric energy recovery unit for storage. 8. The method according to claim 7, wherein there are multiple devices, and the first device is any one of the multiple devices, wherein the method comprises: When it is detected that the first device is in a power-on state, control to transmit the electric energy on the DC common bus to the first device. 9. The method according to claim 7, further comprising: The storage capacity of the electric energy recovery unit is adjusted according to the braking power of the equipment. 10. The method according to claim 9, wherein the device is a stacker, wherein generating the braking power of the device comprises: Determine the stacker according to the acquired motor moment of inertia of the stacker, the motor load moment of inertia converted to the motor side, the speed before braking, the speed after braking, the deceleration time and the load torque of the stacker braking torque; The braking power of the device is obtained based on the braking torque and the rated rotational speed of the motor of the stacker.

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