CN113258662A - Energy distribution method and energy distribution device for electric equipment and electric loader - Google Patents
Energy distribution method and energy distribution device for electric equipment and electric loader Download PDFInfo
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- CN113258662A CN113258662A CN202110683136.7A CN202110683136A CN113258662A CN 113258662 A CN113258662 A CN 113258662A CN 202110683136 A CN202110683136 A CN 202110683136A CN 113258662 A CN113258662 A CN 113258662A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/08—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing a dc motor
- H02P3/14—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing a dc motor by regenerative braking
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/10—The network having a local or delimited stationary reach
- H02J2310/20—The network being internal to a load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application provides an energy distribution method of an electric device, an energy distribution device and an electric loader, the electric device comprises a switch switching circuit, a rectifying circuit, an energy distribution controller, an energy storage device and a working motor, power is provided through an external power supply grid, alternating current is converted into direct current through the rectifying circuit, the value of direct current bus voltage is detected in the energy distribution method and compared with a first threshold value, if the direct current bus voltage is larger than the first threshold value, the electric device is considered to be in a braking and decelerating process, the working motor generates electricity to enable the direct current bus voltage to rise to exceed the first threshold value, therefore, the electric device needs to be switched to an electric energy storage mode, the working motor is connected with the energy storage device, the electric energy of the working motor is stored into the energy storage device, and the utilization rate of the electric energy is improved.
Description
Technical Field
The application relates to the technical field of engineering mechanical equipment, in particular to an energy distribution method and device of electric equipment and an electric loader.
Background
The electric equipment which can be operated by the power supplied by the onboard battery pack and can be connected with external power and supplied with power by the external power supply appears in the existing engineering mechanical equipment, can charge the battery pack simultaneously when using the external power supply, obtains energy from a power grid through dragging a cable, and is suitable for site operation and roadway operation. However, in the electric equipment in the prior art, since the electric energy can only be transmitted to the electric equipment from the power grid in one direction, when the working motor is in a deceleration braking state, the electric energy can only be converted into heat energy through the energy consumption device to be consumed, and the utilization rate of the electric energy is not high.
Disclosure of Invention
An object of the embodiments of the present application is to provide an energy distribution method and an energy distribution device for an electric device, and an electric loader, so as to solve the problem that in the prior art, when a working motor is in a deceleration braking state, electric energy can only be converted into heat energy through an energy consumption device to be consumed, and the utilization rate of the electric energy is not high.
The embodiment of the invention provides an energy distribution method of electric equipment, wherein the electric equipment comprises a switch switching circuit, a rectifying circuit, an energy distribution controller, energy storage equipment and a working motor, wherein the rectifying circuit, the energy distribution controller, the energy storage equipment and the working motor are connected with the switch switching circuit; when the electric equipment works, the rectifying circuit is connected with a power supply grid, and when the electric equipment is in the braking and decelerating process, the working motor generates power to increase the voltage of a direct current bus of the rectifying circuit;
the energy distribution method comprises the following steps:
the energy distribution controller acquires the voltage of a direct current bus;
the energy distribution controller determines that the direct current bus voltage is greater than a first threshold value;
the energy distribution controller sends a first switching signal to the switch switching circuit, controls the switch switching circuit to disconnect the rectifying circuit from the energy storage device and the working motor respectively, and controls the switch switching circuit to connect the working motor with the energy storage device.
In the technical scheme, the electric equipment comprises a switch switching circuit, a rectifying circuit, an energy distribution controller, energy storage equipment and a working motor, wherein electric power is provided by an external power supply grid, alternating current is converted into direct current after the electric power is converted into direct current through the rectifying circuit, the value of direct current bus voltage is detected and compared with a first threshold value in the energy distribution method, if the direct current bus voltage is greater than the first threshold value, the electric equipment is considered to be in a braking and decelerating process, and the working motor generates electricity to cause the direct current bus voltage to rise above the first threshold value.
In some optional embodiments, after the energy distribution controller obtains the dc bus voltage, the method further includes:
the energy distribution controller determines that the direct current bus voltage is less than or equal to a second threshold value; wherein the first threshold is greater than the second threshold;
and the energy distribution controller sends a second switching signal to the switch switching circuit, and the switch switching circuit is controlled to connect the working motor with the energy storage device and the rectifying circuit respectively.
In the technical scheme, after the energy distribution method obtains the direct-current bus voltage, the value of the direct-current bus voltage is judged to be smaller than or equal to the second threshold value, then the electric energy provided by the current power supply grid is considered to be difficult to meet the power requirement of the working motor, in order to make up for the power supply capacity of the power supply grid, the electric equipment is switched to a supplementary power supply mode, namely the working motor is simultaneously connected with the energy storage equipment and the rectification circuit, the power requirement on the power supply grid is reduced by releasing the electric energy through the energy storage equipment, and the working motor can work normally.
In some optional embodiments, after the energy distribution controller obtains the dc bus voltage, the method further includes:
the energy distribution controller determines that the direct-current bus voltage is smaller than or equal to a first threshold value and is larger than a second threshold value;
the energy distribution controller sends a third switching signal to the switch switching circuit, controls the switch switching circuit to disconnect the energy storage device from the rectifying circuit and the working motor respectively, and controls the switch switching circuit to connect the rectifying circuit with the working motor.
In the technical scheme, when the direct-current bus voltage is smaller than or equal to the first threshold and is larger than the second threshold, namely the direct-current bus voltage is in a normal range, at the moment, the electric equipment is switched to a normal working mode, the working motor is disconnected from the energy storage equipment, and the alternating current of the power supply grid supplies power to the working motor after being converted by the alternating current and the direct current of the rectifying circuit.
In some optional embodiments, the rectification circuit is disconnected from the power supply grid when the electric equipment is in transition;
the energy distribution method further comprises:
the energy distribution controller determines that the direct-current bus voltage is zero;
and the energy distribution controller sends a fifth switching signal to the switch switching circuit, and the switch switching circuit is controlled to connect the energy storage equipment with the working motor.
Above-mentioned technical scheme considers the condition that the electrical equipment can't provide the electric energy through the power supply electric wire netting when carrying out the transition, need switch over the electrical equipment to the mode of transition this moment, can be connected with the work motor by energy storage equipment, only releases the electric energy through energy storage equipment, comes the power supply for the work motor.
In some optional embodiments, the electrically powered device further comprises an energy consuming device, the energy consuming device being connected to the switch switching circuit;
after the energy distribution controller determines that the direct current bus voltage is greater than the first threshold value, the method further comprises:
the energy distribution controller determines whether the energy storage device is in a full capacity state or a fault state; in both the full capacity state and the fault state, the energy storage device cannot realize the energy storage function;
the energy distribution controller sends a fourth switching signal to the switch switching circuit, the switch switching circuit is controlled to disconnect the energy storage device from the rectifying circuit and the working motor respectively, the switch switching circuit is controlled to disconnect the rectifying circuit from the working motor, and the energy consumption device is controlled to be connected with the working motor.
In the above technical solution, the electric device further has an energy consumption device, and when the energy storage device cannot provide an electric energy storage function, if the electric energy supplied by the power supply grid is greater than the electric energy consumed by the electric device, the electric device is switched to a consumption mode, that is, the consumption device is connected to the working motor, and the energy consumption device can consume the electric energy, so as to ensure the safety of each device in the electric device.
An energy distribution apparatus provided in an embodiment of the present invention includes:
the switch switching circuit is used for switching the connection relation among the rectifying circuit, the working motor and the energy storage equipment;
the energy distribution controller is connected with the rectifying circuit, connected with the switch switching circuit and used for acquiring direct-current bus voltage; determining that the voltage of the direct current bus is greater than a first threshold value; and sending a first switching signal to the switch switching circuit, controlling the switch switching circuit to disconnect the rectifying circuit from the energy storage device and the working motor respectively, and controlling the switch switching circuit to connect the working motor with the energy storage device.
In some optional embodiments, the energy distribution controller is further configured to determine that the dc bus voltage is less than or equal to a second threshold; wherein the first threshold is greater than the second threshold; and sending a second switching signal to the switch switching circuit, and controlling the switch switching circuit to connect the working motor with the energy storage device and the rectifying circuit respectively.
In some optional embodiments, the energy distribution controller is further configured to determine that the dc bus voltage is less than or equal to a first threshold value, and that the dc bus voltage is greater than a second threshold value;
and sending a third switching signal to the switch switching circuit, controlling the switch switching circuit to disconnect the energy storage device from the rectifying circuit and the working motor respectively, and controlling the switch switching circuit to connect the rectifying circuit with the working motor.
In some optional embodiments, the energy distribution controller is further configured to determine that the dc bus voltage is zero; and sending a fifth switching signal to the switch switching circuit, and controlling the switch switching circuit to connect the energy storage device with the working motor.
An embodiment of the present invention provides an electric loader, including any one of the above energy distribution devices, the electric loader further including:
the energy storage device is connected with the switch switching circuit and is used for storing electric energy and supplying power to the working motor;
the alternating current side of the rectifying circuit is connected with a power supply grid, and the direct current side of the rectifying circuit is respectively connected with the energy distribution controller and the switch switching circuit and is used for converting the alternating current of the power supply grid into direct current;
and the working motor is connected with the switch switching circuit and is used for connecting the rectifying circuit with a power supply grid when the electric loader works, and the working motor generates power to increase the direct-current bus voltage of the rectifying circuit when the electric loader works in the braking and decelerating process.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of an electric loader according to an embodiment of the present disclosure;
FIG. 2 is a flowchart of an energy distribution method in a stored electric energy mode according to an embodiment of the present disclosure;
fig. 3 is a flowchart of an energy distribution method in a supplementary power mode according to an embodiment of the present disclosure;
fig. 4 is a flowchart of an energy distribution method in a normal operating mode according to an embodiment of the present application;
fig. 5 is a flowchart of an energy distribution method in a transition mode according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of another electric loader according to an embodiment of the present disclosure;
FIG. 7 is a flowchart of an energy distribution method in consumption mode according to an embodiment of the present disclosure;
FIG. 8 is a schematic structural diagram of an energy distribution device according to an embodiment of the present disclosure;
fig. 9 is a schematic circuit connection diagram of an energy distribution device according to an embodiment of the present disclosure.
Icon: 1-energy distribution controller, 2-switch switching circuit, 3-rectification circuit, 4-energy storage device, 5-working motor, 6-power supply grid and 7-energy consumption device.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
The electric equipment which can be operated by the power supplied by the onboard battery pack and can be connected with external power and supplied with power by the external power supply appears in the existing engineering mechanical equipment, can charge the battery pack simultaneously when using the external power supply, obtains energy from a power grid through dragging a cable, and is suitable for site operation and roadway operation. However, in the electric equipment in the prior art, since the electric energy can only be transmitted to the electric equipment from the power grid in one direction, when the working motor is in a deceleration braking state, the electric energy can only be converted into heat energy through the energy consumption device to be consumed, and the utilization rate of the electric energy is not high.
Therefore, in the energy distribution method for the electric equipment in the embodiment of the invention, the connection relation of each device in the electric equipment is changed and the mode of the electric equipment is switched by detecting the direct-current bus voltage of the rectifying circuit, so that when the working motor is in a deceleration braking state, the electric energy generated by the working motor can be stored, and the utilization rate of the electric energy is improved.
The electric equipment includes a motor loader or other electric equipment with a motor, and for convenience of description, the following embodiments are described by taking the motor loader as an example, and it should be clear that the energy distribution method of the embodiments of the present invention is also applicable to other electric equipment with a motor.
The loader is widely applied to the fields of shoveling and loading of bulk materials such as soil, sand, stones and minerals, and the like, and capital construction. Loaders used in the industry commonly employ an internal combustion engine as a power source. Because the price of fuel oil is continuously increased, the operation cost of the loader driven by the fuel oil power is continuously increased, meanwhile, the fuel oil can cause serious pollution to air, and along with the continuous enhancement of environmental protection and energy-saving awareness of people, the loader driven by the fuel oil power can not meet the requirements of the times gradually. To this end, an embodiment of the present invention provides an electric loader:
referring to fig. 1, fig. 1 is a structural diagram of an electric loader according to an embodiment of the present invention, the electric loader includes: the device comprises a switch switching circuit 2, a rectifying circuit 3, an energy distribution controller 1, an energy storage device 4 and a working motor 5.
The energy storage device 4 is connected with the switch switching circuit 2, and the energy storage device 4 is used for storing electric energy and supplying power to the working motor 5; the alternating current side of the rectifying circuit 3 is connected with a power supply grid 6, the direct current side of the rectifying circuit 3 is respectively connected with the energy distribution controller 1 and the switch switching circuit 2, and the rectifying circuit 3 is used for converting alternating current of the power supply grid 6 into direct current; the working motor 5 is connected with the switch switching circuit 2, when the working motor 5 is used for the work of the electric loader, the rectifying circuit 3 is connected with the power supply grid 6, and when the electric loader works in the braking and decelerating process, the working motor 5 generates power to increase the voltage of the direct current bus of the rectifying circuit 3. The switch switching circuit 2 is respectively connected with the rectifying circuit 3, the energy distribution controller 1, the energy storage device 4 and the working motor 5, and the switch switching device is used for changing the circuit connection relation among the rectifying circuit 3, the working motor 5 and the energy storage device 4; the energy distribution controller 1 is connected to the dc side of the rectifying circuit 3, and is configured to obtain a dc bus voltage of the rectifying circuit 3, and control the switch switching circuit 2 according to the dc bus voltage to change a circuit connection relationship among the rectifying circuit 3, the working motor 5, and the energy storage device 4.
Referring to fig. 2, fig. 2 is a flowchart of an energy distribution method for an electric loader according to an embodiment of the present invention. When the electric loader works, the rectifying circuit 3 is connected with the power supply grid 6, and when the electric loader works in the braking and decelerating process, the working motor 5 generates electricity to increase the voltage of a direct-current bus of the rectifying circuit 3;
the energy distribution method switches the electric loader to the electric energy storage mode through the following steps 101-103:
101. the energy distribution controller 1 acquires the dc bus voltage.
102. The energy distribution controller 1 determines that the dc bus voltage is greater than a first threshold.
103. The energy distribution controller 1 sends a first switching signal to the switch switching circuit 2, controls the switch switching circuit 2 to disconnect the rectifying circuit 3 from the energy storage device 4 and the working motor 5 respectively, and controls the switch switching circuit 2 to connect the working motor 5 with the energy storage device 4.
In step 101-. Here, supplementary explanation is made on another case that may cause the dc bus voltage to rise, that is, the energy surge of the power supply grid 6, which is not sustained for a long time in the normal case, the instantaneous peak value of the energy surge is high, but the energy is small and has no storage meaning, and generally does not reach the dc side of the rectifier circuit 3, so the embodiment of the present invention only discusses the case where the dc bus voltage rises due to the power generation of the working motor 5.
Referring to fig. 3, fig. 3 is a flowchart illustrating the energy distribution method for switching the electric loader to the supplementary power mode according to the embodiment of the present invention, which includes the following steps 201 and 203:
201. the energy distribution controller 1 acquires the dc bus voltage.
202. The energy distribution controller 1 determines that the direct current bus voltage is less than or equal to a second threshold value; wherein the first threshold is greater than the second threshold.
203. The energy distribution controller 1 sends a second switching signal to the switch switching circuit 2, and controls the switch switching circuit 2 to connect the working motor 5 with the energy storage device 4 and the rectifying circuit 3 respectively.
In the energy distribution method of step 201 and 203, after acquiring the dc bus voltage, the energy distribution controller 1 determines that the value of the dc bus voltage is less than or equal to the second threshold, and then determines that the power requirement of the working motor 5 is difficult to be satisfied by the electric energy provided by the current power supply grid 6, and in order to compensate the power supply capability of the power supply grid 6, the electric device is switched to the supplementary power supply mode, that is, the working motor 5 is simultaneously connected with the energy storage device 4 and the rectification circuit 3, and the power requirement on the power supply grid 6 is reduced by releasing the electric energy from the energy storage device 4, so that the working motor 5 can normally work.
Referring to fig. 4, fig. 4 is a flowchart illustrating the energy distribution method for switching the electric loader to the normal operation mode according to the embodiment of the present invention, which includes the following steps 301-303:
301. the energy distribution controller 1 acquires the dc bus voltage.
302. The energy distribution controller 1 determines that the dc bus voltage is less than or equal to a first threshold value and the dc bus voltage is greater than a second threshold value.
303. The energy distribution controller 1 sends a third switching signal to the switch switching circuit 2, controls the switch switching circuit 2 to disconnect the energy storage device 4 from the rectifying circuit 3 and the working motor 5 respectively, and controls the switch switching circuit 2 to connect the rectifying circuit 3 with the working motor 5.
In the energy distribution method of step 301 plus 303, when the dc bus voltage is less than or equal to the first threshold and the dc bus voltage is greater than the second threshold, that is, the dc bus voltage is in the normal range, at this time, the electric device switches to the normal operating mode, and disconnects the operating motor 5 from the energy storage device 4, so that the ac power of the power supply grid 6 is converted by the ac/dc converter of the rectifier circuit 3 to supply power to the operating motor 5.
Referring to fig. 5, fig. 5 is a flowchart illustrating an energy distribution method implemented by the present invention when switching an electric loader to a transition mode, in which a rectification circuit 3 is disconnected from a power supply grid 6 when an electric device is in transition, the energy distribution method includes the following steps 401 and 403:
401. the energy distribution controller 1 determines that the dc bus voltage is zero.
In step 401, the energy distribution controller 1 may further determine whether the rectifying circuit 3 is disconnected from the power supply grid 6 by detecting the plug states of the power supply grid 6 and the rectifying circuit 3. Detection modalities include, but are not limited to: contact switches, pressure switches, interlock circuits, etc.
402. The energy distribution controller 1 sends a fifth switching signal to the switch switching circuit 2, which controls the switch switching circuit 2 to connect the energy storage device 4 with the working motor 5.
Step 401 and step 402 of the embodiment of the present invention consider a situation that the electric device cannot provide electric energy through the power supply grid 6 when the electric device is in transition, at this time, the electric device needs to be switched to the transition mode, that is, the energy storage device 4 is connected with the working motor 5, and only the energy storage device 4 releases electric energy to supply power to the working motor 5.
Referring to fig. 6, the electric loader of fig. 6 further includes an energy consumption device 7, and the energy consumption device 7 is connected to the switch switching circuit 2. Applied to the electric loader of fig. 6, the flow chart of the energy distribution method is shown in fig. 7, and the electric loader is switched to the consumption mode through steps 501 and 504:
501. the energy distribution controller 1 acquires the voltage of a direct current bus;
502. after the energy distribution controller 1 determines that the dc bus voltage is greater than the first threshold, the method further includes:
503. the energy distribution controller 1 determines whether the energy storage device 4 is in a full capacity state or a fault state; in both the full capacity state and the fault state, the energy storage device 4 cannot realize the energy storage function;
504. the energy distribution controller 1 sends a fourth switching signal to the switch switching circuit 2, controls the switch switching circuit 2 to disconnect the energy storage device 4 from the rectifying circuit 3 and the working motor 5, respectively, controls the switch switching circuit 2 to disconnect the rectifying circuit 3 from the working motor 5, and controls the energy consumption device 7 to connect with the working motor 5.
Step 501 and 504 of the embodiment of the present invention, the electric loader further has an energy consumption device 7, and when the energy storage device 4 cannot provide the electric energy storage function, if the electric energy supplied by the power supply grid 6 is greater than the electric energy consumed by the electric device, the electric device is switched to the consumption mode, that is, the consumption device is connected to the operating motor 5, and the energy consumption device 7 can consume the part of the electric energy, so as to ensure the safety of each device in the electric device.
Based on the same inventive concept, an embodiment of the present invention further provides an energy distribution apparatus, as shown in fig. 8, the energy distribution apparatus includes:
the switch switching circuit 2 is used for switching the connection relation among the rectifying circuit 3, the working motor 5 and the energy storage device 4;
the energy distribution controller 1 is connected with the rectifying circuit 3 and the switch switching circuit 2, and is used for controlling the switch switching circuit 2 to switch the connection relationship among the rectifying circuit 3, the working motor 5 and the energy storage device 4, and includes but is not limited to the following four conditions:
in the first situation, the energy distribution controller 1 obtains the dc bus voltage, determines that the dc bus voltage is greater than the first threshold, and sends the first switching signal to the switch switching circuit 2, controls the switch switching circuit 2 to disconnect the rectifying circuit 3 from the energy storage device 4 and the working motor 5, respectively, and controls the switch switching circuit 2 to connect the working motor 5 to the energy storage device 4.
In the second case, the energy distribution controller 1 obtains the dc bus voltage, and determines that the dc bus voltage is less than or equal to a second threshold; wherein the first threshold is greater than the second threshold; and sending a second switching signal to the switch switching circuit 2, and controlling the switch switching circuit 2 to connect the working motor 5 with the energy storage device 4 and the rectifying circuit 3 respectively.
In the third situation, the energy distribution controller 1 obtains the dc bus voltage, determines that the dc bus voltage is less than or equal to the first threshold value and the dc bus voltage is greater than the second threshold value, and sends a third switching signal to the switch switching circuit 2, controls the switch switching circuit 2 to disconnect the energy storage device 4 from the rectifying circuit 3 and the working motor 5, respectively, and controls the switch switching circuit 2 to connect the rectifying circuit 3 with the working motor 5.
In the fourth situation, the energy distribution controller 1 obtains the dc bus voltage, determines that the dc bus voltage is zero, and sends a fifth switching signal to the switch switching circuit 2 to control the switch switching circuit 2 to connect the energy storage device 4 with the working motor 5.
In another embodiment, the switch switching circuit 2 is used for switching the connection relationship among the rectification circuit 3, the working motor 5, the energy consumption device 7 and the energy storage device 4, and the energy distribution controller 1 is used in the fifth case: acquiring direct current bus voltage; determining that the voltage of the direct current bus is greater than a first threshold value; determining that the energy storage device 4 is in a full capacity state or a fault state; and sending a fourth switching signal to the switch switching circuit 2, controlling the switch switching circuit 2 to disconnect the energy storage device 4 from the rectifying circuit 3 and the working motor 5 respectively, controlling the switch switching circuit 2 to disconnect the rectifying circuit 3 from the working motor 5, and controlling the energy consumption device 7 to connect with the working motor 5.
Specifically, as shown in fig. 9, the power distribution apparatus according to the embodiment of the present invention includes a relay K0, a relay K1, a relay K2, a relay K3, a current sensor C0, a current sensor C1, a current sensor C2, a current sensor C3, a voltage sensor, and a power distribution controller 1. The energy distribution controller 1 communicates with the energy storage device 4 and other electric devices through the CAN bus. The energy distribution controller 1 acquires the direct current bus voltage through the voltage sensor, and sends control instructions to the relay K0, the relay K1, the relay K2 and the relay K3 according to the direct current bus voltage so as to control the switching of the relay. The energy distribution controller 1 collects the voltage of the direct current bus through the voltage sensor and collects the current value of each module through the four current sensors, and the energy distribution controller 1 can calculate power according to the voltage and the current value of the direct current bus and control the flowing direction of electric energy by taking the three as a judgment basis. For example, when the relay K0 is closed, the relay K1 is closed, the relay K2 is open, and the relay K3 is open, the power supply grid 6 can charge the energy storage device 4 through the rectifying circuit 3; when the relay K0 is closed, the relay K1 is opened, the relay K2 is opened, and the relay K3 is closed, the power supply grid 6 can supply power to other electric equipment after passing through the rectifying circuit 3; when the relay K0 is switched off, the relay K1 is switched on, the relay K2 is switched off, and the relay K3 is switched on, the working motor 5 in other electric equipment can be used for generating electricity, electric energy can be stored in the energy storage equipment 4, and the energy storage equipment 4 can also be used for releasing the electric energy to supply power to other electric equipment; when the relay K0 is switched off, the relay K1 is switched off, the relay K2 is switched on, and the relay K3 is switched on, redundant electric energy generated by the working motor 5 in other electric equipment can be consumed by the energy consumption equipment 7; when the relay K0 is closed, the relay K1 is closed, the relay K2 is opened, and the relay K3 is closed, the power supply grid 6 and the energy storage device 4 can simultaneously supply power for other electric devices.
Wherein, other electric equipment includes electric equipment such as work motor 5, DC/DC equipment, air compressor machine equipment, air conditioning equipment. The energy storage device 4 may be a lithium battery pack or other types of battery packs, or may be an electric energy storage medium such as a super capacitor, and is equipped with a corresponding control management unit. And preferentially selecting a lithium battery pack scheme. The energy consuming device 7 is typically a high power resistor, which may be replaced by other energy consuming components.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
In addition, units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
Furthermore, the functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The energy distribution method of the electric equipment is characterized in that the electric equipment comprises a switch switching circuit, and a rectifying circuit, an energy distribution controller, an energy storage device and a working motor which are connected with the switch switching circuit, wherein the rectifying circuit is connected with the energy distribution controller; when the electric equipment works, the rectifying circuit is connected with a power supply grid, and when the electric equipment is in the braking and decelerating process, the working motor generates power to increase the voltage of a direct current bus of the rectifying circuit;
the energy distribution method is applied to an energy distribution controller, and comprises the following steps:
acquiring the voltage of the direct current bus;
determining that the DC bus voltage is greater than a first threshold;
and sending a first switching signal to the switch switching circuit, controlling the switch switching circuit to disconnect the rectifying circuit from the energy storage device and the working motor respectively, and controlling the switch switching circuit to connect the working motor with the energy storage device.
2. The energy distribution method of claim 1, wherein after obtaining the dc bus voltage, further comprising:
determining that the DC bus voltage is less than or equal to a second threshold; wherein the first threshold is greater than the second threshold;
and sending a second switching signal to the switch switching circuit, and controlling the switch switching circuit to connect the working motor with the energy storage device and the rectifying circuit respectively.
3. The energy distribution method of claim 1, wherein after obtaining the dc bus voltage, further comprising:
determining that the direct current bus voltage is less than or equal to a first threshold value and the direct current bus voltage is greater than a second threshold value;
and sending a third switching signal to the switch switching circuit, controlling the switch switching circuit to disconnect the energy storage device from the rectifying circuit and the working motor respectively, and controlling the switch switching circuit to connect the rectifying circuit with the working motor.
4. The energy distribution method of claim 1, wherein the electrically powered device further comprises an energy consuming device connected to the switching circuit;
after determining that the direct current bus voltage is greater than the first threshold, the method further includes:
determining that the energy storage device is in a full capacity state or a fault state;
and sending a fourth switching signal to the switch switching circuit, controlling the switch switching circuit to disconnect the energy storage device from the rectifying circuit and the working motor respectively, controlling the switch switching circuit to disconnect the rectifying circuit from the working motor, and controlling the energy consumption device to be connected with the working motor.
5. The energy distribution method according to claim 1, wherein the rectification circuit is disconnected from the power supply grid when the electrically powered device is in transition;
the energy distribution method further comprises:
determining that the direct current bus voltage is zero;
and sending a fifth switching signal to the switch switching circuit, and controlling the switch switching circuit to connect the energy storage device with the working motor.
6. An energy distribution apparatus, comprising:
the switch switching circuit is used for switching the connection relation among the rectifying circuit, the working motor and the energy storage equipment;
the energy distribution controller is connected with the rectifying circuit, connected with the switch switching circuit and used for acquiring direct-current bus voltage; determining that the DC bus voltage is greater than a first threshold; and sending a first switching signal to the switch switching circuit, controlling the switch switching circuit to disconnect the rectifying circuit from the energy storage device and the working motor respectively, and controlling the switch switching circuit to connect the working motor with the energy storage device.
7. The power distribution apparatus of claim 6, wherein the power distribution controller is further configured to determine that the DC bus voltage is less than or equal to a second threshold; wherein the first threshold is greater than the second threshold; and sending a second switching signal to the switch switching circuit, and controlling the switch switching circuit to connect the working motor with the energy storage device and the rectifying circuit respectively.
8. The energy distribution device of claim 6, wherein the energy distribution controller is further configured to determine that the DC bus voltage is less than or equal to a first threshold value and that the DC bus voltage is greater than a second threshold value;
and sending a third switching signal to the switch switching circuit, controlling the switch switching circuit to disconnect the energy storage device from the rectifying circuit and the working motor respectively, and controlling the switch switching circuit to connect the rectifying circuit with the working motor.
9. The energy distribution apparatus of claim 6, wherein the energy distribution controller is further configured to determine that the DC bus voltage is zero; and sending a fifth switching signal to the switch switching circuit, and controlling the switch switching circuit to connect the energy storage device with the working motor.
10. A motor loader comprising an energy distribution apparatus according to any one of claims 6 to 9, the motor loader further comprising:
the energy storage device is connected with the switch switching circuit and is used for storing electric energy and supplying power to the working motor;
the alternating current side of the rectifying circuit is connected with a power supply grid, and the direct current side of the rectifying circuit is respectively connected with an energy distribution controller and a switch switching circuit and is used for converting the alternating current of the power supply grid into direct current;
the working motor is connected with the switch switching circuit and used for connecting the rectifying circuit with a power supply grid when the electric loader works, and when the electric loader works in the braking and decelerating process, the working motor generates power to enable the voltage of a direct current bus of the rectifying circuit to be increased.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110683136.7A CN113258662A (en) | 2021-06-21 | 2021-06-21 | Energy distribution method and energy distribution device for electric equipment and electric loader |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110683136.7A CN113258662A (en) | 2021-06-21 | 2021-06-21 | Energy distribution method and energy distribution device for electric equipment and electric loader |
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Application publication date: 20210813 |