WO2022205684A1

WO2022205684A1 - Power system and crane

Info

Publication number: WO2022205684A1
Application number: PCT/CN2021/107087
Authority: WO
Inventors: 李昌武; 谢军; 尉国钢; 沈彬; 俞晓斌; 费振鑫
Original assignee: 浙江三一装备有限公司
Priority date: 2021-03-30
Filing date: 2021-07-19
Publication date: 2022-10-06
Also published as: CN112874325A

Abstract

Provided are a power system (100) and a crane. The power system comprises a motor (110), a range increasing module (120), a drag module (130), a battery module (140), and a controller (150). The range increasing module (120) comprises an engine (121) and a generator (122) that are mechanically connected, and the engine (121) is used for driving the generator (122) to generate electric energy. The drag module (130) is used for being connected to an external power supply and obtaining electric energy from the external power supply. The controller (150) is separately and electrically connected to the range increasing module (120), the drag module (130) and the battery module (140), and is used for obtaining the real-time load of a load unit connected to the motor (110), and controlling, on the basis of the real-time load, the range increasing module (120), the drag module (130) and the battery module (140) to provide electric energy for the motor. The power system (100) and the crane have a range-increased and dragged power solution, which can provide efficient and environmentally-friendly power, and can meet the use requirements of multiple scenarios.

Description

Power system and crane

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent application with the application number 202110343313.7 and the invention title "Power System and Crane" filed on March 30, 2021, which is incorporated herein by reference in its entirety.

technical field

The present application relates to the technical field of construction machinery, in particular to a power system and a crane.

Background technique

Electric cranes are more and more widely used in various engineering work scenarios. Electric cranes rely on power batteries to provide power for traveling and hoisting work, and the power batteries need to be charged before work. Because the working location of the electric crane is not fixed, it often works in scenes with harsh conditions, such as field operation scenes, which makes it impossible to provide a stable charging power supply for the power battery, which makes the electric crane work for a short time and has low work efficiency. the needs of various work scenarios.

SUMMARY OF THE INVENTION

The present application provides a power system and a crane, which are used to solve the technical problems of short operation time, low operation efficiency, and inability to adapt to the needs of various operation scenarios.

The present application provides a power system, including a motor, a range extender module, a drag power module, a battery module and a controller;

The range extension module includes a mechanically connected engine and a generator, and the engine is used to drive the generator to generate electrical energy;

the power-pulling module is used to connect with an external power source and obtain electrical energy from the external power source;

The controller is electrically connected to the range extension module, the drag power module and the battery module, respectively, and is used for acquiring the real-time load of the load connected to the motor, and based on the real-time load, controls the At least one of the range extender module, the dragging power module and the battery module provides power for the electric motor.

According to a power system provided by the present application, the controller includes a load acquisition unit, a state acquisition unit and a power supply control unit;

the load acquisition unit, configured to acquire the real-time load of the load connected to the motor;

The state acquisition unit is used to acquire the connection state between the tow power module and the external power supply;

The power supply control unit is electrically connected to the load acquisition unit and the state acquisition unit, respectively, and is configured to control the range extension based on the real-time load and the connection state between the drag power module and an external power supply At least one of the module, the drag power module and the battery module provides electrical power to the electric motor.

According to a power system provided by the present application, the power supply control unit is specifically used for:

When the connection state between the dragging power module and the external power source is connected, the dragging power module is controlled to provide electric power to the motor.

When the connection state between the dragging power module and the external power source is not connected, if the real-time load is less than the first set load value, the battery module is controlled to provide electrical energy for the motor;

The first set load value is determined based on the remaining power of the battery module.

When the connection state of the dragging power module is not connected with the external power supply,

If the real-time load is greater than or equal to a first set load value and less than or equal to a second set load value, controlling the range extension module to provide electrical energy for the motor;

The second set load value is determined based on the rated power of the range extender module.

When the connection state of the dragging power module is not connected to an external power supply, if the real-time load is greater than the second set load value, the range extension module and the battery module are controlled to provide electrical energy for the motor.

According to a power system provided by the present application, the battery module is electrically connected to the range extension module;

The controller includes a recovery control unit, configured to control the battery module to adjust the range extension module to the range extension module if the real-time load is less than the output power of the range extension module when the range extension module provides electrical energy for the motor. The output power of the process module is recovered.

According to a power system provided by the present application, the tow power module is electrically connected to the battery module;

The controller includes a charging control unit, for when the connection state between the towed power module and the external power source is connected, if the power of the battery module is less than the set value, then the towed power module is controlled to be all to charge the battery module described above.

According to a power system provided by the present application, the tow power module is provided with a movable socket for detachable connection with the external power source.

The present application also provides a crane, including the power system.

The power system and crane provided by this application include a motor, a range extender module, a tow power module, a battery module and a controller. The controller obtains the real-time load of the load connected to the motor, and controls the range extender module and the tow power according to the real-time load. The module and battery module provide electric power for the electric motor. The power system has extended-range and tow-electric power solutions, which can provide efficient and environmentally friendly power, and can meet the needs of multiple scenarios.

Description of drawings

In order to illustrate the technical solutions in the present application or the prior art more clearly, the following briefly introduces the accompanying drawings that are needed in the description of the embodiments or the prior art. Obviously, the drawings in the following description are of the present application. For some embodiments of the present invention, for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is one of the schematic structural diagrams of the power system provided by the application;

2 is a schematic structural diagram of a range extension module provided by the present application;

3 is one of the schematic structural diagrams of the controller provided by the application;

FIG. 4 is the second schematic structural diagram of the power system provided by the application;

FIG. 5 is the second schematic structural diagram of the controller provided by the application;

FIG. 6 is the third schematic structural diagram of the power system provided by the application;

FIG. 7 is the third schematic structural diagram of the controller provided by the application;

FIG. 8 is a schematic structural diagram of a crawler crane with tow power and extended range provided by the application;

FIG. 9 is a schematic diagram of the energy transfer of the crawler crane with electric drag and extended range provided by the present application.

Reference number:

100: power system; 110: electric motor;

120: range extension module; 130: drag power module;

140: battery module; 150: controller;

151: load acquisition unit; 152: state acquisition unit;

153: power supply control unit; 154: recovery control unit;

155: Charge control unit. .

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the accompanying drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application. , not all examples. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

FIG. 1 is one of the schematic structural diagrams of the power system provided by the application. As shown in FIG. 1 , the power system 100 includes a motor 110, a range extender module 120, a drag power module 130, a battery module 140 and a controller 150; the dotted line in the figure Represents signal control connections, solid lines represent power transfer connections.

The range extender module 120 includes a mechanically connected engine 121 and a generator 122, the engine 121 is used to drive the generator 122 to generate electrical energy; the tow power module 130 is used to connect with an external power source and obtain electrical energy from the external power source; the controller 150, respectively It is electrically connected to the range extender module 120, the tow power module 130 and the battery module 140, and is used to obtain the real-time load of the load connected to the motor 110, and based on the real-time load, control the range extender module 120, the tow power module 130 and the battery module 140. At least one of them provides electrical energy to the motor 110 .

Specifically, working machines are various types of machines that perform engineering operations, including mixer trucks, cranes, bulldozers, and excavators. The power system 100 is installed in the work machine, and provides power for traveling and operation of the work machine. For example, when the working machine is an electric crane, the power system 100 can drive the hydraulic pump of the electric crane, and drive the hydraulic oil to provide power for each execution structure of the electric crane, so that the electric crane can complete the lifting task. The power system 100 may also drive the wheels or crawlers of the electric crane so that the electric crane travels between multiple work areas.

The power system 100 includes an electric motor 110 , a range extender module 120 , a drag power module 130 , a battery module 140 and a controller 150 . The motor 110 is connected to the load, and drives the load to complete various tasks. The load may be a hydraulic device, a drive device, or the like. The range extender module 120 , the dragging power module 130 and the battery module 140 are respectively electrically connected to the electric motor 110 to provide electric power for the electric motor 110 .

The range extension module 120 provides electrical energy for the motor by converting chemical energy into electrical energy. FIG. 2 is a schematic structural diagram of a range extension module provided by the present application. As shown in FIG. 2 , the range extension module 120 includes an engine 121 and a generator 122 that are mechanically connected. The engine 121 and the generator 122 may be connected coaxially. Engine 121 may be an internal combustion engine, such as a diesel engine or a gasoline engine. The engine 121 converts the chemical energy of the fuel into mechanical energy, and drives the generator 122 to rotate. The generator 122 converts mechanical energy into electrical energy.

The drag power module 130 is connected to an external power source, and obtains power from the external power source. For example, the external power source may be a grid or a large electrical energy storage device.

The battery module 140 can be charged and discharged. When the power system 100 is not working, the battery module 140 can be charged, and when the power system 100 is working, the battery module 140 can provide electric power to the electric motor 110 by discharging. The battery module 140 may be a ternary polymer lithium battery, a lithium iron phosphate battery, or the like.

The controller 150 is respectively electrically connected with the range extender module 120, the tow power module 130 and the battery module 140, obtains the real-time load of the load connected to the motor 110, and controls the range extender module 120, the tow power module 130 and the battery module according to the real-time load 140 provides electrical power to the motor 110 .

The controller 150 may select one or more modules among the range extender module 120 , the drag power module 130 and the battery module 140 to provide power to the motor 110 according to the real-time load. For example, if the real-time load is small, the controller 150 may select the battery module 140 to provide power to the motor 110; if the real-time load is large, the controller 150 may select the range extender module 120 and the battery module 140 to jointly provide power to the motor 110. When the external power source is more convenient to obtain, the controller 150 may also select the power drag module 130 to provide power to the motor 110. At this time, the engine 121 and the generator 122 in the range extender module 120 may not work, and only rely on the external power source to provide power to the motor 110. Power system 100 provides electrical power.

Compared with the existing power system, the power system 110 provided in the embodiment of the present application has multiple power sources, and can use the power pre-stored in the battery module 140, and can also use the range extender module 120 and/or the tow power module 130. supplied power.

The power system provided by the embodiment of the present application includes a motor, a range extender module, a tow power module, a battery module, and a controller. The controller obtains the real-time load of the load connected to the motor, and controls the range extender module, the tow power module according to the real-time load. The module and battery module provide electric power for the electric motor. The power system has extended-range and tow-electric power solutions, which can provide efficient and environmentally friendly power, and can meet the needs of multiple scenarios.

Based on the above embodiment, FIG. 3 is one of the schematic structural diagrams of the controller provided by the application. As shown in FIG. 3 , the controller 150 includes a load acquisition unit 151, a state acquisition unit 152 and a power supply control unit 153;

The load acquisition unit 151 is electrically connected to the power supply control unit 153 for acquiring the real-time load of the load connected to the electric motor 110;

The state acquisition unit 152 is electrically connected with the power supply control unit 153, and is used for acquiring the connection state between the tow power module and the external power supply;

The power supply control unit 153 is configured to control at least one of the range extender module 120 , the tow power module 130 and the battery module 140 to provide power to the motor 110 based on the real-time load and the connection state between the tow power module 130 and the external power source.

Specifically, the load acquisition unit 151 is used to acquire the real-time load of the load connected to the motor 110, and send the real-time load to the electrically connected power supply control unit 153, so that the power supply control unit 153 performs power supply control.

The load is mechanically connected to the motor 110 . The load is a device or device that converts the electromagnetic torque provided by the motor 110 into mechanical torque and performs external work. For example, if the power plant 100 is provided on an electric crane, the load may be a hydraulic pump. The electric motor 110 is directly connected with the hydraulic pump or connected through a gearbox, converts electrical energy into mechanical energy of the hydraulic pump, pushes the hydraulic oil to do external work, and drives the mechanical arm of the electric crane to lift heavy objects. At this time, the output power that the hydraulic pump needs to provide externally is the real-time load of the hydraulic pump. The electric crane may include a power conversion device, determine the output power of the hydraulic pump according to the weight of the heavy object to be lifted, and send the output power to the load acquisition unit 151 as a real-time load.

The state acquisition unit 152 is configured to acquire the connection state between the drag power module 130 and the external power supply, and send the connection state to the electrically connected power supply control unit 153 . The connection status includes connected and not connected.

A voltage or current detection device may be provided in the drag power module 130 for detecting an external power source. If an external voltage or current is detected, the state acquisition unit 152 confirms that the connection state between the drag power module 130 and the external power source is connected; if no external voltage or current is detected, the state acquisition unit 152 confirms that the drag power module 130 is connected to the external power source. The connection status between the power supplies is not connected.

The power supply control unit 153 flexibly selects the range extender module 120, the tow power module 130 and the battery module 140 to provide power to the motor 110 according to the real-time load and the connection state between the tow power module 130 and the external power source. For example, if the real-time load is large, multiple modules can be selected to provide power together. If the drag power module 130 is connected to an external power source, the external power source is preferentially selected.

Based on any of the above embodiments, the power supply control unit 153 is specifically used for:

When the connection state between the dragging power module 130 and the external power source is connected, the dragging power module 130 is controlled to provide power to the motor 110 .

Specifically, when the construction site allows, the tow power module 130 is connected to an external power source, and can preferentially obtain power from the external power source. At this time, both the range extender module 120 and the battery module 140 may not work. The engine in the range extension module 120 does not work, which reduces the pollution and consumption of fuel. When the battery module 140 does not work, the number of charging and discharging is reduced, and the service life of the battery is prolonged.

Preferably, the external power source is the grid. The cost of using electricity from the grid is lower.

When the connection state between the dragging power module 130 and the external power source is not connected, if the real-time load is less than the first set load value, the battery module 140 is controlled to provide electric power for the motor.

Specifically, the first set load value is used to measure the real-time load, and can be determined according to the remaining power of the battery module 140 .

When the connection state between the drag power module 130 and the external power source is not connected, it indicates that there is no available external power source in the working environment at this time. If the real-time load is less than the first set load value, it indicates that the real-time load of the load is within the bearing range of the battery module 140 . The power supply control unit 153 may selectively control the battery module 140 to supply power to the motor 110 .

For example, when an E-Crane performs transition tasks, only a fraction of the power is required to drive the wheels for moving between work areas. At this time, the electric motor 110 is connected to the wheel drive device, and the real-time load of the wheel drive device is relatively small, which is lower than the first set load value. At this time, the battery module 140 is controlled to provide power to the motor 110, and the range extension module 120 does not need to be activated.

When the connection status of the tow power module 130 is not connected to the external power supply, if the real-time load is greater than or equal to the first set load value and less than or equal to the second set load value, the range extension module 120 is controlled to provide electrical energy for the motor 110;

The second set load value is determined based on the rated power of the range extender module 120 .

Specifically, the second set load value is used to measure the real-time load, and may be determined according to the rated power of the range extension module 120 .

When the connection state of the tow power module 130 is not connected to the external power supply, if the real-time load is greater than or equal to the first set load value, it indicates that the real-time load of the load exceeds the carrying range of the battery module 140; the real-time load is less than or equal to the second set load value. If the fixed load value is set, it indicates that the real-time load of the load is within the carrying range of the range extension module 120 . The power supply control unit 153 may selectively control the range extender module 120 to provide power to the motor 110 .

For example, when an electric crane performs lifting tasks, a large amount of power is required to drive the hydraulic pump, which is used to drive the mechanical arm to lift the heavy object. At this time, the electric motor 110 is connected with the hydraulic pump, and the real-time load of the hydraulic pump is relatively large, which is greater than the first set load value and less than the second set load value, which exceeds the bearing range of the battery module 140 . At this time, the range extension module 120 is controlled to provide power to the motor 110 . The power supply control unit 153 can send a start command to the engine 121, and the coaxial drive generator 122 rotates to generate electric energy.

When the connection state of the drag power module 130 is not connected to the external power source, if the real-time load is greater than the second set load value, the range extender module 120 and the battery module 140 are controlled to provide electric power for the motor.

Specifically, when the connection status of the tow power module 130 is not connected to the external power supply, if the real-time load is greater than the second set load value, it indicates that the real-time load of the load exceeds the carrying range of the range extension module 120 . The power supply control unit 153 may selectively control the range extender module 120 and the battery module 140 to supply power to the motor.

For example, when an electric crane performs lifting tasks, a large amount of power is required to drive the hydraulic pump, which is used to drive the mechanical arm to lift the heavy object. At this time, the electric motor 110 is connected to the hydraulic pump, and the real-time load of the hydraulic pump is relatively large, which is greater than the second set load value and exceeds the bearing range of the range extension module 120 .

At this time, the power supply control unit 153 sends a start command to the engine 121 while controlling the battery module 140 to provide power to the motor, and coaxially drives the generator 122 to rotate to generate power, so that the range extender module 120 also provides power to the motor 110 at the same time.

Based on any of the above embodiments, the battery module 140 is electrically connected to the range extension module 120;

The controller 150 includes a recovery control unit 154 for controlling the battery module 140 to recover the output power of the range extension module 120 if the real-time load is less than the output power of the range extension module 120 when the range extension module 120 provides electric power for the motor 110 . .

Specifically, when the range extension module 120 operates, the engine 121 generally operates at a set rotational speed. For example, the engine 121 generally works at an economical speed, at which time the fuel consumption is the lowest and the torque is the largest, and the economical speed is determined according to the performance parameters of the engine 121 and the fuel consumption. When the range extension module 120 is working, the real-time load of the load is not constant, and the electric energy consumed by the motor 110 needs to be adjusted accordingly according to the change of the real-time load, that is, the electric energy supply of the electric motor 110 is adjusted. At this time, if the rotational speed of the engine 121 in the range extender module 120 is frequently adjusted to change the output power of the generator 122, the economy of the range extender module 120 will be deteriorated, the fuel consumption and emission will be increased, and the stability of the power output will be deteriorated.

FIG. 4 is the second schematic structural diagram of the power system provided by the application. As shown in FIG. 4 , the battery module 140 is electrically connected to the range extender module 120 . The dotted line in the figure represents the signal control connection, and the solid line represents the power transmission connection. The electrical energy generated by the range extender module 120 may be stored in the battery module 140 . FIG. 5 is the second schematic structural diagram of the controller provided by the application. As shown in FIG. 5 , the controller 150 includes a recovery control unit 154 . When the range extender module 120 provides electric power to the motor 110 , if the real-time load is less than the output power of the range extender module 120 , at this time, keeping the rotation speed of the engine 121 unchanged, the recovery control unit 154 controls the output of the battery module 140 to the range extender module 120 Electricity is recovered. The recovered electrical energy is the difference between the output electrical energy of the range extender module 120 and the electrical energy consumed by the load.

Based on any of the above embodiments, the dragging power module 130 is electrically connected to the battery module 140;

The controller 150 includes a charging control unit 155, which is used to control the tow power module 130 to charge the battery module 140 if the power of the battery module 140 is less than the set value when the connection state between the drag power module 130 and the external power source is connected. .

Specifically, when the tow power module 130 is working, the electric energy obtained from the external power source can not only be provided to the electric motor 110, but also can be used to provide the battery module 140 for charging.

FIG. 6 is the third schematic structural diagram of the power system provided by the application. As shown in FIG. 6 , the tow power module 130 is electrically connected to the battery module 140 . The dotted line in the figure represents the signal control connection, and the solid line represents the power transmission connection. FIG. 7 is the third schematic structural diagram of the controller provided by the application. As shown in FIG. 7 , the controller 150 includes a charging control unit 155, which is used for charging when the connection state between the dragging power module 130 and the external power source is connected. , the range extension module 120 does not work. The power consumption of the power system 100 comes entirely from an external power source. If the power of the battery module 140 is less than the set value, the charging control unit 155 controls the power-pulling module 130 to charge the battery module 140 .

The set value may be set according to the low battery alarm value of the battery module 140 . For example, when the power of the battery module 140 is lower than the low power alarm value, the battery module 140 can be charged by the power-pulling module 130.

Based on any of the above embodiments, the drag power module 130 is provided with a movable socket for detachable connection with an external power source.

Specifically, when the power system 100 provides electrical energy, it may be in a moving state or in a stationary state. For example, the power system 100 is provided on an electric crane, and the electric crane can lift heavy objects in a fixed position, and can also move heavy objects in a small range.

At this time, the power system 100 can maintain a flexible connection with the external power source. For example, a movable socket is provided on the power dragging module 130, which is flexibly connected to a transformer in the power grid through a cable. When the power system 100 moves, it can always be connected to the power grid within the range of the cable length, and obtain power from the power grid. When the operating area of the power system 100 exceeds the range of the cable length, the tow power module 130 can remove the cable connection and disconnect from the power grid. At this time, the power system 100 is powered by the range extender module 120 and the battery module 140 .

Based on any of the above embodiments, the present application further provides a crane, including the above power system.

Specifically, the crane provided by the present application includes at least one power system. The types of cranes are not limited to truck cranes, crawler cranes, and the like.

The crawler crane is a mobile crane that installs the lifting operation part on the crawler chassis and relies on the crawler device for walking. The varieties of wire ropes for crawler cranes include phosphating coated wire ropes, galvanized wire ropes and smooth wire ropes. Crawler cranes are composed of metal structures such as booms and turntables, as well as hoisting, rotating, luffing and running mechanisms. The hoisting and luffing mechanism adopts the reel to wind the steel rope, and the lifting device and the boom pitch luffing are made through the complex pulley group. The rotating mechanism adopts a turntable type supporting device.

The truck crane combines the driving cab and the lifting control room into one, which is evolved from a crawler crane. The crawler and the walking bracket of the traveling mechanism are turned into a chassis with tires, which overcomes the damage caused by the crawler crane's crawler shoes to the road surface. The disadvantage belongs to material handling machinery.

Based on any of the above-mentioned embodiments, FIG. 8 is a schematic structural diagram of a crawler crane with electric power and extended range provided by the present application. As shown in FIG. 8 , in a scenario where power cannot be taken under severe conditions: when the power demand of the crane is large, the battery The output power is provided in parallel with the generator; when the crane needs less power, the excess output power from the generator will charge the lithium battery. During the overall operation of the crane, it is ensured that the output energy of the lithium battery when the crane demand power is large is equal to the input energy when the crane demand power is small. In the scenario of easy access to electricity: the crawler crane adopts the power-towing working mode, and the engine and generator do not work at this time, and the electricity from the power grid is rectified by the rectifier converter and directly acts on the motor. FIG. 9 is a schematic diagram of the energy transfer of the power-towing and extended-range crawler crane provided by the present application. As shown in FIG. 9 , the power-towing and extended-range crawler crane converts electrical energy into mechanical energy for external work. The dotted line in the figure represents electrical energy, and the solid line represents mechanical energy. Among them, the output of the power battery is high-voltage direct current, and the generator converts the mechanical energy of the engine rotation into electrical energy, which is sent to the high-voltage power distribution unit after passing through the rectifier. The high voltage distribution unit is used to convert the high voltage direct current and/or the electricity produced by the generator into the 380V alternating current required by the electric motor. Under the control of the motor controller, the motor drives the hydraulic pump and drives each execution structure to do external work.

The device embodiments described above are only illustrative, wherein 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 it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

From the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and certainly can also be implemented by hardware. Based on this understanding, the above-mentioned technical solutions can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products can be stored in computer-readable storage media, such as ROM/RAM, magnetic A disc, an optical disc, etc., includes several commands to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments or some parts of the embodiments.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions in the embodiments of the present application.

Claims

A power system is characterized in that it comprises a motor, a range extension module, a drag power module, a battery module and a controller;

The range extension module includes a mechanically connected engine and a generator, and the engine is used to drive the generator to generate electrical energy;

the power-pulling module is used to connect with an external power source and obtain electrical energy from the external power source;

The controller is electrically connected to the range extension module, the drag power module and the battery module, respectively, and is used for acquiring the real-time load of the load connected to the motor, and based on the real-time load, controls the At least one of the range extender module, the dragging power module and the battery module provides power for the electric motor.
The power system according to claim 1, wherein the controller comprises a load acquisition unit, a state acquisition unit and a power supply control unit;

the load acquisition unit, configured to acquire the real-time load of the load connected to the motor;

The state acquisition unit is used to acquire the connection state between the tow power module and the external power supply;

The power supply control unit is electrically connected to the load acquisition unit and the state acquisition unit, respectively, and is configured to control the range extension based on the real-time load and the connection state between the drag power module and an external power supply At least one of the module, the drag power module and the battery module provides electrical power to the electric motor.
The power system according to claim 2, wherein the power supply control unit is specifically used for:

When the connection state between the dragging power module and the external power source is connected, the dragging power module is controlled to provide electric power to the motor.
The power system according to claim 2, wherein the power supply control unit is specifically used for:

When the connection state between the dragging power module and the external power source is not connected, if the real-time load is less than the first set load value, the battery module is controlled to provide electrical energy for the motor;

The first set load value is determined based on the remaining power of the battery module.
The power system according to claim 4, wherein the power supply control unit is specifically used for:

When the connection state of the tow power module is not connected to the external power supply, if the real-time load is greater than or equal to the first set load value and less than or equal to the second set load value, the range extension module is controlled to be the Electric motor provides electrical energy;

The second set load value is determined based on the rated power of the range extender module.
The power system according to claim 5, wherein the power supply control unit is specifically used for:

When the connection state of the dragging power module is not connected to an external power supply, if the real-time load is greater than the second set load value, the range extension module and the battery module are controlled to provide electrical energy for the motor.
The power system according to any one of claims 1 to 6, wherein the battery module is electrically connected to the range extension module;

The controller includes a recovery control unit, configured to control the battery module to adjust the range extension module to the range extension module if the real-time load is less than the output power of the range extension module when the range extension module provides electrical energy for the motor. The output power of the process module is recovered.
The power system according to any one of claims 1 to 6, wherein the dragging power module is electrically connected to the battery module;

The controller includes a charging control unit, for when the connection state between the towed power module and the external power source is connected, if the power of the battery module is less than the set value, then the towed power module is controlled to be all to charge the battery module described above.
The power system according to any one of claims 1 to 6, wherein the drag power module is provided with a movable socket for detachable connection with the external power supply.
A crane, characterized by comprising the power system according to any one of claims 1 to 9.