CN114256881A - Energy processing system, method and working machine - Google Patents
Energy processing system, method and working machine Download PDFInfo
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- CN114256881A CN114256881A CN202111506188.3A CN202111506188A CN114256881A CN 114256881 A CN114256881 A CN 114256881A CN 202111506188 A CN202111506188 A CN 202111506188A CN 114256881 A CN114256881 A CN 114256881A
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
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Abstract
The invention provides an energy processing system, a method and a working machine, wherein a circuit comprises: the system comprises a three-phase rectification inverter circuit, a controller, a motor and a power grid; the motor is used for generating three-phase alternating current when braking revolution occurs and transmitting the three-phase alternating current to the three-phase rectification inverter circuit; the controller is used for controlling the three-phase rectification inverter circuit to convert the three-phase alternating current into target alternating current; the controller is used for acquiring the phase of the power grid and the frequency of the power grid, and controlling the three-phase rectification inverter circuit to transmit the target alternating current to the power grid based on the phase of the power grid and the frequency of the power grid. The invention is used for solving the defect of energy waste in the prior art.
Description
Technical Field
The invention relates to the technical field of grid-connected power generation, in particular to an energy processing system, an energy processing method and an operation machine.
Background
The electric power-driven excavator uses the three-phase power of the power grid to supply power to the motor of the electric excavator so as to enable the electric excavator to work. However, in an actual operation process of the electric excavator, when the electric excavator rotates, if an obstacle is encountered, braking rotation occurs, and at this time, a certain amount of energy is generated.
Therefore, how to recover the energy generated by the motor during braking rotation to save energy is an important issue to be solved in the industry.
Disclosure of Invention
The invention provides an energy processing system, an energy processing method and an operating machine, which are used for overcoming the defect of energy waste in the prior art, realizing energy recovery and saving energy.
The invention provides an energy processing system, comprising: the system comprises a three-phase rectification inverter circuit, a controller, a motor and a power grid;
the motor is electrically connected with the first end of the three-phase rectification inverter circuit and used for generating three-phase alternating current when braking rotation occurs and transmitting the three-phase alternating current to the three-phase rectification inverter circuit;
the controller is respectively in signal connection with a first end and a second end of the three-phase rectification inverter circuit and is used for controlling the three-phase rectification inverter circuit to convert the three-phase alternating current into target alternating current;
the controller is in signal connection with the power grid and is used for acquiring the phase and frequency of the power grid and controlling the three-phase rectification inverter circuit to transmit the target alternating current to the power grid based on the phase and frequency of the power grid;
and the second end of the three-phase rectification inverter circuit is electrically connected with the power grid.
According to the energy processing system provided by the invention, the three-phase rectification inverter circuit comprises: a rectifier sub-circuit and an inverter sub-circuit;
the first end of the rectifier sub-circuit is electrically connected with the motor and used for converting the three-phase alternating current into target direct current;
the first end of the inverter sub-circuit is electrically connected with the second end of the rectifier sub-circuit, and the second end of the inverter sub-circuit is electrically connected with the power grid and used for converting the target direct current into the target alternating current.
According to the energy processing system provided by the invention, the three-phase rectification inverter circuit further comprises: a filter sub-circuit;
the first end of the filter sub-circuit is electrically connected with the second end of the inverter sub-circuit, and the second end of the filter sub-circuit is electrically connected with the power grid and is used for filtering the target alternating current and transmitting the filtered target alternating current to the power grid.
According to the energy processing system provided by the invention, the rectifier sub-circuit comprises: the power supply comprises a first power semiconductor device, a second power semiconductor device, a third power semiconductor device, a fourth power semiconductor device, a fifth power semiconductor device, a sixth power semiconductor device and a first capacitor;
the first power semiconductor device and the fourth power semiconductor device are connected in series and are used as a first combination device, and the first combination device is electrically connected with a first phase line of the motor;
the second power semiconductor device and the fifth power semiconductor device are connected in series and are used as a second combined device, and the second combined device is electrically connected with a second phase line of the motor;
the third power semiconductor device and the sixth power semiconductor device are connected in series and are used as a third combined device, and the third combined device is electrically connected with a third phase line of the motor;
connecting the first, second, third component devices and the first capacitor in parallel.
According to the energy processing system provided by the invention, the inverter sub-circuit comprises: the power semiconductor device comprises a seventh power semiconductor device, an eighth power semiconductor device, a ninth power semiconductor device, a tenth power semiconductor device, an eleventh power semiconductor device, a twelfth power semiconductor device and a second capacitor;
the seventh power semiconductor device and the tenth power semiconductor device are connected in series and are used as a fourth combined device, and the fourth combined device is electrically connected with the first phase line of the power grid;
the eighth power semiconductor device and the eleventh power semiconductor device are connected in series, and the eighth power semiconductor device and the eleventh power semiconductor device are used as a fifth combined device which is electrically connected with a second phase line of the power grid;
the ninth power semiconductor device and the twelfth power semiconductor device are connected in series, and the ninth power semiconductor device and the twelfth power semiconductor device are used as a sixth combined device which is electrically connected with a third phase line of the power grid;
the fourth combination device, the fifth component device, the sixth component device and the second capacitor are connected in parallel.
According to the energy processing system provided by the invention, the filtering sub-circuit comprises: a relay and a reactor;
the reactor is used for filtering the target alternating current;
and the controller is used for opening the relay and transmitting the target alternating current passing through the reactor to the power grid when the phase of the power grid is determined to be consistent with the phase of the target alternating current and the frequency of the power grid is determined to be consistent with the frequency of the target alternating current.
According to the energy processing system provided by the invention, when the motor operates normally, the power grid transmits the three-phase alternating current of the power grid to the three-phase rectification inverter circuit, the three-phase rectification inverter circuit is controlled by the controller to convert the three-phase alternating current of the power grid into the three-phase alternating current of the motor, and the three-phase rectification inverter circuit transmits the three-phase alternating current of the motor to the motor.
The invention also provides an energy processing method, which is applied to an energy processing system and comprises the following steps:
s1: when the braking revolution of the motor is determined, converting three-phase alternating current generated by the motor into target alternating current by using a three-phase rectification inverter circuit;
s2: acquiring the phase and frequency of a power grid;
s3: and controlling the three-phase rectification inverter circuit to transmit the target alternating current to the power grid based on the phase and the frequency of the power grid.
According to the energy processing method provided by the present invention,
when the motor is determined to be braked and rotated, the three-phase rectification inverter circuit in the energy processing system is utilized to convert the three-phase alternating current generated by the motor into the target alternating current, and the method comprises the following steps:
when the braking revolution of the motor is determined, converting three-phase alternating current produced by the motor into target direct current by using a rectifier sub-circuit in the three-phase rectification inverter circuit;
and converting the target direct current into the target alternating current by using an inverter sub-circuit in the three-phase rectification inverter circuit.
The invention also provides a working machine comprising an energy handling system as described in any of the above.
The energy processing system of the invention realizes energy recovery through the provided energy processing system, and the energy processing system comprises: the three-phase rectification and inversion circuit comprises a three-phase rectification and inversion circuit, a controller, a motor and a power grid, wherein the motor is electrically connected with the first end of the three-phase rectification circuit and is used for generating three-phase alternating current when braking rotation occurs and transmitting the three-phase alternating current to the three-phase rectification and inversion circuit; the controller is respectively in signal connection with the first end of the three-phase rectification inverter circuit and the second end of the three-phase rectification inverter circuit and is used for controlling the three-phase rectification inverter circuit to convert the three-phase alternating current into target alternating current; the controller is in signal connection with the power grid and is used for acquiring the phase of the power grid and the frequency of the power grid, and controlling the three-phase rectification inverter circuit to transmit the target alternating current to the power grid based on the phase of the power grid and the frequency of the power grid.
According to the energy processing method provided by the invention, when the braking revolution of the motor is determined, the three-phase alternating current generated by the motor is converted into the target alternating current by using the three-phase rectification inverter circuit, so that the three-phase alternating current generated by the motor is converted instead of being directly discarded, the waste of energy is avoided, and further, the phase and the frequency of a power grid are obtained; the target alternating current is transmitted to the power grid based on the phase and the frequency of the power grid, and the target alternating current meeting the power grid requirement can be transmitted to the power grid, so that the energy is recycled, the energy waste is avoided, the energy is effectively saved, and the user experience is improved.
According to the operating machine comprising the energy processing system, the generated energy is recycled by using the energy processing system when the operating machine operates, so that the energy waste is avoided, the energy is effectively saved, and the user experience is improved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is one of the schematic structural views of an energy processing system provided by the present invention;
FIG. 2 is a second schematic diagram of the energy processing system according to the present invention;
FIG. 3 is a third schematic diagram of an energy processing system according to the present invention;
FIG. 4 is a fourth schematic diagram of the energy processing system provided by the present invention;
FIG. 5 is a fifth schematic view of the energy processing system of the present invention;
FIG. 6 is a sixth schematic diagram of the energy processing system of the present invention;
FIG. 7 is a seventh schematic structural view of an energy processing system provided by the present invention;
FIG. 8 is one of the flow diagrams of the energy processing method provided by the present invention;
FIG. 9 is a second flowchart of the energy processing method provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The energy treatment system of the present invention is described below in conjunction with fig. 1-7
An embodiment of the present invention provides an energy processing system, specifically as shown in fig. 1, the system includes: the three-phase rectification inverter circuit 101, the controller 102, the motor 103 and the power grid 104;
the motor 103 is electrically connected with a first end of the three-phase rectification inverter circuit 101, and is used for generating three-phase alternating current when the motor 103 is braked and rotated, and transmitting the three-phase alternating current to the three-phase rectification inverter circuit 101;
the controller 102 is respectively in signal connection with a first end of the three-phase rectification inverter circuit 101 and a second end of the three-phase rectification inverter circuit 101, and is used for controlling the three-phase rectification inverter circuit 101 to convert three-phase alternating current into target alternating current;
the controller 102 is in signal connection with the power grid 104, and is configured to acquire a phase of the power grid 104 and a frequency of the power grid 104, and control the three-phase rectification inverter circuit 101 to transmit the target alternating current to the power grid 104 based on the phase of the power grid 104 and the frequency of the power grid 104;
wherein, the second end of the three-phase rectification inverter circuit 101 is electrically connected with the power grid 104.
Specifically, the controller 102 is in signal connection with the power grid 104, and is configured to obtain a phase of the power grid 104 and a frequency of the power grid 104, and control the three-phase rectification inverter circuit 101 to transmit the target alternating current to the power grid 104 when it is determined that the phase of the power grid 104 is consistent with the phase of the target alternating current and the frequency of the power grid 104 is consistent with the frequency of the target alternating current.
In one embodiment, as shown in fig. 2, the three-phase rectification inverter circuit 101 includes: a rectifier sub-circuit 201 and an inverter sub-circuit 202; a first end of the rectifier sub-circuit 201 is electrically connected with the motor 103 and used for converting three-phase alternating current into target direct current;
a first terminal of the inverter sub-circuit 202 is electrically connected to a second terminal of the rectifier sub-circuit 201, and a second terminal of the inverter sub-circuit 202 is electrically connected to the grid 104, for converting the target direct current into the target alternating current.
According to the invention, alternating current generated by the motor 103 is converted into direct current through the rectifier sub-circuit 201, and then the direct current is converted into alternating current through the inverter sub-circuit 202, so as to meet the requirement of three-phase power of the power grid 104.
In one embodiment, as shown in fig. 3, the three-phase rectification inverter circuit 101 further includes a filtering sub-circuit 301; the first end of the filter sub-circuit 301 is electrically connected to the second end of the inverter sub-circuit 202, and the second end of the filter sub-circuit 301 is electrically connected to the power grid 104, and is configured to perform filtering processing on the target alternating current and transmit the filtered target alternating current to the power grid 104.
According to the invention, the filtering sub-circuit 301 is utilized to filter the target alternating current so as to remove interference noise, so that the target alternating current input into the power grid 104 better meets the requirements of the power grid 104, and the user experience is improved.
In one embodiment, as shown in fig. 4, the rectifying sub-circuit 201 includes: a first power semiconductor device 401, a second power semiconductor device 402, a third power semiconductor device 403, a fourth power semiconductor device 404, a fifth power semiconductor device 405, a sixth power semiconductor device 406, and a first capacitor 407;
the first power semiconductor device 401 and the fourth power semiconductor device 404 are connected in series, and the first power semiconductor device 401 and the fourth power semiconductor device 404 are used as a first combined device which is electrically connected with a first phase line of the motor 103;
the second power semiconductor device 402 and the fifth power semiconductor device 405 are connected in series, and the second power semiconductor device 402 and the fifth power semiconductor device 405 are used as a second combined device which is electrically connected with a second phase line of the motor 103;
the third power semiconductor device 403 and the sixth power semiconductor device 406 are connected in series, and the third power semiconductor device 403 and the sixth power semiconductor device 406 are used as a third combined device which is electrically connected with a third phase line of the motor 103;
the first combination device, the second combination device, and the third combination device are connected in parallel to the first capacitor 407, respectively.
The power Semiconductor device may be an Insulated Gate Bipolar Transistor (IGBT for short) or a Metal-Oxide Semiconductor Field Effect Transistor (MOSFET for short).
The first capacitor 407 is used for filtering, and may be an electrolytic capacitor or a thin film capacitor.
According to the invention, the first power semiconductor device 401 and the fourth power semiconductor device 404, the second power semiconductor device 402 and the fifth power semiconductor device 405, and the third power semiconductor device 403 and the sixth power semiconductor device 406 are respectively connected in series, so that the rectifier sub-circuit 201 can bear higher blocking voltage, and the withstand voltage value of the rectifier sub-circuit 201 is improved.
According to the invention, alternating current generated by the motor 103 is converted into direct current through the first power semiconductor device 401, the second power semiconductor device 402, the third power semiconductor device 403, the fourth power semiconductor device 404, the fifth power semiconductor device 405, the sixth power semiconductor device 406 and the first capacitor 407, and the first capacitor 407 enables the working performance of the rectifier sub-circuit 201 to be more stable, and simultaneously reduces the interference of alternating pulsation ripple on the rectifier sub-circuit, so that the output of the direct current is smooth and stable.
In one embodiment, as shown in fig. 5 in particular, the inverter sub-circuit 202 includes: a seventh power semiconductor device 501, an eighth power semiconductor device 502, a ninth power semiconductor device 503, a tenth power semiconductor device 504, an eleventh power semiconductor device 505, a twelfth power semiconductor device 506, and a second capacitor 507;
the seventh power semiconductor device 501 and the tenth power semiconductor device 504 are connected in series, and the seventh power semiconductor device 501 and the tenth power semiconductor device 504 are used as a fourth combined device which is electrically connected with the first phase line of the power grid 104;
the eighth power semiconductor device 502 and the eleventh power semiconductor device 505 are connected in series, and the eighth power semiconductor device 502 and the eleventh power semiconductor device 505 are used as a fifth combined device which is electrically connected with the second phase line of the power grid 104;
the ninth power semiconductor device 503 and the twelfth power semiconductor device 506 are connected in series, and the ninth power semiconductor device 503 and the twelfth power semiconductor device 506 are used as a sixth combined device which is electrically connected with the third phase line of the power grid 104;
the fourth, fifth, and sixth component devices are connected in parallel to the second capacitor 507, respectively.
The second capacitor 507 is used for filtering, and may be an electrolytic capacitor or a thin film capacitor.
In particular, the inverter sub-circuit 202 further comprises a relay 508, see in particular fig. 5.
Wherein, when the first power semiconductor device 401 to the sixth power semiconductor device 406 are IGBTs, the seventh power semiconductor device 407 to the twelfth power semiconductor device 506 are also IGBTs; when the first power semiconductor device 401 to the sixth power semiconductor device 406 are MOSFETs, the seventh power semiconductor device 407 to the twelfth power semiconductor device 506 are also MOSFETs. The invention enables the power semiconductor device of the rectifier sub-circuit 201 to be consistent with the power semiconductor device of the inverter sub-circuit 202, enables the conversion mechanism between direct current and alternating current to be consistent, and has higher practicability.
Similarly, in the present invention, the seventh power semiconductor device 501 and the tenth power semiconductor device 504, the eighth power semiconductor device 502 and the eleventh power semiconductor device 505, and the ninth power semiconductor device 503 and the twelfth power semiconductor device 506 are respectively connected in series, so that the inverter sub-circuit 202 can bear a higher blocking voltage, and the withstand voltage of the inverter sub-circuit 202 is increased.
According to the invention, the direct current transmitted by the rectifier sub-circuit 201 is converted into alternating current through the seventh power semiconductor device 501, the eighth power semiconductor device 502, the ninth power semiconductor device 503, the tenth power semiconductor device 504, the eleventh power semiconductor device 505, the twelfth power semiconductor device 506 and the second capacitor 507, and the second capacitor 507 enables the working performance of the rectifier sub-circuit to be more stable, and meanwhile, the interference of alternating pulsation ripple on the rectifier sub-circuit is reduced, so that the output of the direct current is smooth and stable.
In one embodiment, as shown in fig. 6, the filtering sub-circuit 301 comprises: a relay 601 and a reactor 602; a reactor 602 for performing filtering processing on a target alternating current; the controller 102 is specifically configured to, when it is determined that the phase of the power grid 104 is consistent with the phase of the target alternating current, and the frequency of the power grid 104 is consistent with the frequency of the target alternating current, open the relay 601 and transmit the target alternating current passing through the reactor 602 to the power grid 104.
The reactor 602 is composed of a capacitor and an inductor, and is mainly used for limiting transient current, and is also used for limiting higher harmonics in alternating current in series or parallel connection with the capacitor in a filter, so as to absorb reactive power of charging capacity of a cable line. The operating voltage can be adjusted by adjusting the number of shunt reactors. The ultrahigh voltage shunt reactor has multiple functions of improving reactive power related operation conditions of a power system, and mainly comprises the following steps: the capacitance effect on the light no-load or light load circuit is used for reducing the power frequency transient overvoltage; improving the voltage distribution on the long power transmission line; the reactive power in the line is balanced as far as possible in the light load, so that the unreasonable flow of the reactive power is prevented, and the power loss on the line is reduced; when a large unit is parallel to a system, the power frequency steady-state voltage on a high-voltage bus is reduced, so that the generators can be parallel synchronously; the self-excitation resonance phenomenon which may occur in a long circuit of the generator is prevented; when the neutral point of the reactor is grounded through a small reactor, the small reactor can be used for compensating line interphase and phase-to-ground capacitance so as to accelerate the automatic extinguishing of the secondary current, and the adoption is convenient.
Specifically, the reactor 602 is formed by a third capacitor 6021, a fourth capacitor 6022, a fifth capacitor 6023, a sixth capacitor 6024, a seventh capacitor 6025, an eighth capacitor 6026, a first inductor 6027, a second inductor 6028, and a third inductor 6029, which can be specifically referred to fig. 6.
Specifically, the present invention takes the motor of the towing electric excavator as an example, and two operation modes, i.e., a driving mode and a feedback power generation mode, may be defined based on whether the motor 103 is operated to drive or generate power. In the drive mode: the energy of the power grid 104 is conditioned by the energy processing system into voltages and currents with different frequencies and different amplitudes to control the rotation speed and the torque of the motor. When the power generation mode is fed back: the energy braked by the rotary motor is used as a generator, and the voltage and the current of the alternating current with the frequency of 380VAC \50HZ are regulated by an energy processing system to be connected to the grid for power generation.
Specifically, the above section of the embodiment describes a specific implementation in the regenerative power generation mode, and the following section of the embodiment describes a specific implementation in the drive mode. It should be noted that the invention is not limited in any way, but is only for the sake of clarity.
Specifically, in the driving mode, the three-phase ac voltage 380VAC of the power grid is rectified into 540VDC (or other voltages) dc through the filter sub-circuit 301 and the inverter sub-circuit 202, and the dc voltage is inverted into three-phase ac power with different frequencies and different amplitudes through the rectifier sub-circuit 201 to drive the motor 103, so that the normal rotation function of the excavator can be ensured.
In one embodiment, during normal operation of the motor 103, the power grid 104 transmits three-phase power grid ac power to the three-phase rectification inverter circuit 101, the controller 102 controls the three-phase rectification inverter circuit 101 to convert the three-phase power grid ac power into three-phase motor ac power, and the three-phase rectification inverter circuit 101 transmits the three-phase motor ac power to the motor 103.
Specifically, the filter sub-circuit 301 and the inverter sub-circuit 202 are combined to control the duty ratios of the first power semiconductor device 401, the second power semiconductor device 402, the third power semiconductor device 403, the fourth power semiconductor device 404, the fifth power semiconductor device 405 and the sixth power semiconductor device 406, so as to convert the three-phase alternating current of the power grid into the direct current, and then the seventh power semiconductor device 501, the eighth power semiconductor device 502, the ninth power semiconductor device 503, the tenth power semiconductor device 504, the eleventh power semiconductor device 505 and the twelfth power semiconductor device 506 convert the direct current into the three-phase alternating current of the motor.
In the invention, direct current passing through a first capacitor 407 and a second capacitor 507 is converted into voltages with different frequencies and different amplitudes by controlling a seventh power semiconductor device 501, an eighth power semiconductor device 502, a ninth power semiconductor device 503, a tenth power semiconductor device 504, an eleventh power semiconductor device 505 and a twelfth power semiconductor device 506 through Space Vector Pulse Width Modulation (SVPWM) to control the rotation speed and the torque of the motor 103.
In the following, fig. 1 to 6 are combined by fig. 7 to specifically illustrate an energy processing system.
Referring specifically to fig. 1 and 7, the present invention provides an energy processing system comprising: the motor 103 is electrically connected with a first end of the three-phase rectification inverter circuit 101, and is used for generating three-phase alternating current when the motor 103 is braked and revolved, and transmitting the three-phase alternating current to the three-phase rectification inverter circuit 101. Therefore, the three-phase alternating current generated when the motor 103 is braked and rotated is transmitted to the three-phase rectification inverter circuit 101, energy is not directly discarded, and energy waste is avoided; the controller 102 is respectively in signal connection with the first end of the three-phase rectification inverter circuit 101 and the second end of the three-phase rectification inverter circuit 101, and is used for controlling the three-phase rectification inverter circuit 101 to convert three-phase alternating current into target alternating current, so that the controller 102 is utilized to convert the three-phase alternating current generated by the motor 103 to obtain the target alternating current so as to adapt to the requirement of the power grid 104; the controller 102 is in signal connection with the power grid 104 and is used for acquiring the phase of the power grid 104 and the frequency of the power grid 104 and controlling the three-phase rectification inverter circuit 101 to transmit the target alternating current to the power grid 104 based on the phase of the power grid 104 and the frequency of the power grid 104.
An embodiment of the present invention further provides an energy processing method, where the method is applied to an energy processing system, and the description of the method may specifically refer to the description of the energy processing system, and repeated parts are not repeated, as shown in fig. 8, the method includes:
In one embodiment, the conversion of the three-phase ac power into the target ac power is realized as follows: when the braking rotation of the motor is determined, converting three-phase alternating current produced by the motor into target direct current by using a rectifier sub-circuit in a three-phase rectification inverter circuit; and converting the target direct current into the target alternating current by using an inverter sub-circuit in the three-phase rectification inverter circuit.
Specifically, when the motor is braked and rotated, the magnetic induction lines are cut, and energy (electromotive force) is generated.
The target alternating current is three-phase 380V voltage of a power grid.
Specifically, since the target alternating current and the grid three-phase alternating current of the grid are required to be in the same frequency and phase, the phase of the grid and the frequency of the grid are required to be acquired to determine the frequency of the target alternating current and the phase of the target alternating current.
And 803, controlling the three-phase rectification inverter circuit to transmit the target alternating current to the power grid based on the phase and the frequency of the power grid.
Specifically, when the phase of the power grid is determined to be consistent with the phase of the target alternating current, and the frequency of the power grid is determined to be consistent with the frequency of the target alternating current, the three-phase rectification inverter circuit is controlled to transmit the target alternating current to the power grid.
Specifically, whether to execute a specific implementation of the step of controlling the three-phase rectification inverter circuit to transmit the target alternating current to the power grid is shown in fig. 9:
And 902, when the phase of the power grid is consistent with the phase of the target alternating current and the frequency of the power grid is consistent with the frequency of the target alternating current according to the judgment result, judging that the target alternating current meets the requirement of the power grid, and executing the step of controlling the three-phase rectification inverter circuit to transmit the target alternating current to the power grid.
And 903, when the phase of the power grid is consistent with the phase of the target alternating current and the frequency of the power grid is inconsistent with the frequency of the target alternating current according to the judgment result, judging that the target alternating current is not in line with the requirement of the power grid, and not executing the step of controlling the three-phase rectification inverter circuit to transmit the target alternating current to the power grid.
And 904, when the phase of the power grid is inconsistent with the phase of the target alternating current and the frequency of the power grid is inconsistent with the frequency of the target alternating current according to the judgment result, judging that the target alternating current is not in line with the requirement of the power grid, and not executing the step of controlling the three-phase rectification inverter circuit to transmit the target alternating current to the power grid.
And 905, when the phase of the power grid is inconsistent with the phase of the target alternating current and the frequency of the power grid is consistent with the frequency of the target alternating current according to the judgment result, judging that the target alternating current is not in line with the requirement of the power grid, and not executing the step of controlling the three-phase rectification inverter circuit to transmit the target alternating current to the power grid.
According to the invention, the energy generated when the motor rotates is recovered by an energy processing method so as to be in grid-connected power generation, so that the energy is effectively saved, and the user experience is improved.
The invention also provides a working machine which comprises any one of the energy processing systems provided in the above embodiments.
The work machine includes an excavator, and the excavator is a power-driven excavator.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An energy processing system, comprising: the system comprises a three-phase rectification inverter circuit, a controller, a motor and a power grid;
the motor is electrically connected with the first end of the three-phase rectification inverter circuit and used for generating three-phase alternating current when braking rotation occurs and transmitting the three-phase alternating current to the three-phase rectification inverter circuit;
the controller is respectively in signal connection with a first end and a second end of the three-phase rectification inverter circuit and is used for controlling the three-phase rectification inverter circuit to convert the three-phase alternating current into target alternating current;
the controller is in signal connection with the power grid and is used for acquiring the phase and frequency of the power grid and controlling the three-phase rectification inverter circuit to transmit the target alternating current to the power grid based on the phase and frequency of the power grid;
and the second end of the three-phase rectification inverter circuit is electrically connected with the power grid.
2. The energy processing system of claim 1, wherein the three-phase rectifying inverter circuit comprises: a rectifier sub-circuit and an inverter sub-circuit;
the first end of the rectifier sub-circuit is electrically connected with the motor and used for converting the three-phase alternating current into target direct current;
the first end of the inverter sub-circuit is electrically connected with the second end of the rectifier sub-circuit, and the second end of the inverter sub-circuit is electrically connected with the power grid and used for converting the target direct current into the target alternating current.
3. The energy processing system of claim 2, wherein the three-phase rectifying inverter circuit further comprises: a filter sub-circuit;
the first end of the filter sub-circuit is electrically connected with the second end of the inverter sub-circuit, and the second end of the filter sub-circuit is electrically connected with the power grid and is used for filtering the target alternating current and transmitting the filtered target alternating current to the power grid.
4. The energy handling system of claim 2, wherein the rectifier sub-circuit comprises: the power supply comprises a first power semiconductor device, a second power semiconductor device, a third power semiconductor device, a fourth power semiconductor device, a fifth power semiconductor device, a sixth power semiconductor device and a first capacitor;
the first power semiconductor device and the fourth power semiconductor device are connected in series and are used as a first combination device, and the first combination device is electrically connected with a first phase line of the motor;
the second power semiconductor device and the fifth power semiconductor device are connected in series and are used as a second combined device, and the second combined device is electrically connected with a second phase line of the motor;
the third power semiconductor device and the sixth power semiconductor device are connected in series and are used as a third combined device, and the third combined device is electrically connected with a third phase line of the motor;
connecting the first, second, third component devices and the first capacitor in parallel.
5. The energy processing system of claim 2, wherein the inverting sub-circuit comprises: the power semiconductor device comprises a seventh power semiconductor device, an eighth power semiconductor device, a ninth power semiconductor device, a tenth power semiconductor device, an eleventh power semiconductor device, a twelfth power semiconductor device and a second capacitor;
the seventh power semiconductor device and the tenth power semiconductor device are connected in series and are used as a fourth combined device, and the fourth combined device is electrically connected with the first phase line of the power grid;
the eighth power semiconductor device and the eleventh power semiconductor device are connected in series, and the eighth power semiconductor device and the eleventh power semiconductor device are used as a fifth combined device which is electrically connected with a second phase line of the power grid;
the ninth power semiconductor device and the twelfth power semiconductor device are connected in series, and the ninth power semiconductor device and the twelfth power semiconductor device are used as a sixth combined device which is electrically connected with a third phase line of the power grid;
the fourth combination device, the fifth component device, the sixth component device and the second capacitor are connected in parallel.
6. The energy processing system of claim 3, wherein the filtering sub-circuit comprises: a relay and a reactor;
the reactor is used for filtering the target alternating current;
and the controller is used for opening the relay and transmitting the target alternating current passing through the reactor to the power grid when the phase of the power grid is determined to be consistent with the phase of the target alternating current and the frequency of the power grid is determined to be consistent with the frequency of the target alternating current.
7. The energy processing system according to any one of claims 1-6, wherein during normal operation of the electric machine, the grid transmits grid three-phase alternating current to the three-phase rectifying and inverting circuit, the controller controls the three-phase rectifying and inverting circuit to convert the grid three-phase alternating current into motor three-phase alternating current, and the three-phase rectifying and inverting circuit transmits the motor three-phase alternating current to the electric machine.
8. An energy processing method, applied to an energy processing system, the method comprising:
s1, when the motor is determined to be braked and rotated, converting the three-phase alternating current generated by the motor into target alternating current by using a three-phase rectification inverter circuit in the energy processing system;
s2, acquiring the phase and frequency of the power grid;
and S3, controlling the three-phase rectification inverter circuit to transmit the target alternating current to the power grid based on the phase and the frequency of the power grid.
9. The energy processing method according to claim 8, wherein when it is determined that the motor is braked and revolved, converting the three-phase alternating current generated by the motor into the target alternating current by using a three-phase rectification inverter circuit in the energy processing system, comprising:
when the braking revolution of the motor is determined, converting three-phase alternating current produced by the motor into target direct current by using a rectifier sub-circuit in the three-phase rectification inverter circuit;
and converting the target direct current into the target alternating current by using an inverter sub-circuit in the three-phase rectification inverter circuit.
10. A work machine, characterized in that the work machine comprises an energy handling system according to any of claims 1-7.
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