CN216069627U - Compound energy storage system of electric machine - Google Patents
Compound energy storage system of electric machine Download PDFInfo
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- CN216069627U CN216069627U CN202121330272.XU CN202121330272U CN216069627U CN 216069627 U CN216069627 U CN 216069627U CN 202121330272 U CN202121330272 U CN 202121330272U CN 216069627 U CN216069627 U CN 216069627U
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- 238000004146 energy storage Methods 0.000 title claims abstract description 40
- 150000001875 compounds Chemical class 0.000 title description 2
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 34
- 239000003990 capacitor Substances 0.000 claims abstract description 33
- 239000002131 composite material Substances 0.000 claims abstract description 24
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The utility model discloses an electromechanical composite energy storage system which comprises a storage battery pack, a super capacitor, a bidirectional DC/DC converter I, a bidirectional DC/DC converter II, a bypass switch, a direct current bus, a four-quadrant converter, an electric machine and an alternating current power distribution network, wherein the storage battery pack is connected with the direct current bus through the bidirectional DC/DC converter I, the super capacitor is connected with the direct current bus through the bidirectional DC/DC converter II and the bypass switch, two sides of the bidirectional DC/DC converter II are mutually connected in parallel with the bypass switch, the direct current bus is connected with the alternating current power distribution network through the four-quadrant converter, and the direct current bus is connected with the electric machine. The system can solve the bottleneck problem of the conventional single storage battery energy storage system or super capacitor and storage battery pack energy storage system, and optimizes the energy flow management of the electric machine so as to expand the application range of the electric machine.
Description
Technical Field
The utility model belongs to the technical field of automobile energy storage systems, and particularly relates to an electromechanical composite energy storage system.
Background
With the increasing aggravation of energy crisis, environmental pollution and other problems and the increasing awareness of human environmental protection, hybrid power machines are getting more and more attention with the advantages of high efficiency, energy conservation, environmental protection and low emission. However, endurance, battery life and performance issues have limited the development of electric machines, and hybrid power is a preferred solution. At present, the hybrid electric machines all adopt a storage battery pack as an energy storage unit of a vehicle. The storage battery pack has high energy density and can store larger energy, but has the defect of incapability of quick charge and discharge, so when the vehicle needs to be frequently started, climbed, accelerated and decelerated, the storage battery pack can be irreversibly damaged, and the service life of the storage battery pack is shortened. Meanwhile, when the motor recovers energy under a braking condition, the charging of the storage battery is performed by a chemical reaction, and the required charging time is long, resulting in low energy recovery efficiency.
The super capacitor has the advantages of high power density and low cost, has quick charge and discharge capacity, forms a complementary state with the storage battery, and provides instantaneous high power by the super capacitor when the motor is started, accelerated and climbs a slope, thereby playing the roles of protecting the storage battery and prolonging the service life of the storage battery; when the motor is braked, the super capacitor absorbs peak power, and the energy recovery efficiency is greatly improved. However, the super capacitor has a low energy density, and is not suitable for being used as a single energy storage unit of an electric machine. Therefore, the composite energy storage system of the super capacitor and the storage battery pack is a better solution at present.
The conventional hybrid electromechanical energy storage method has the following defects:
1. the storage battery pack does not have the rapid charging and discharging capacity, and meanwhile, the storage battery pack mainly adopts lithium battery elements for series-parallel connection, so that the problem of energy imbalance is inevitable, and the problems can cause great influence on the service capacity and service life of the battery when the storage battery pack is used as a single energy storage unit;
2. in a conventional super capacitor and storage battery pack composite energy storage system, a super capacitor is directly connected in parallel with two ends of a direct current bus, and the storage battery pack is connected with the direct current bus through a DC/DC converter. Although the mode avoids that the storage battery pack provides instantaneous large current when the motor is started and suddenly accelerated, the voltage controllability of the direct current bus is poor, and even the storage battery pack is required to provide continuous large charging current when the direct current bus is charged, so that the storage battery pack is damaged;
3. at present, the conventional interaction between the hybrid electric machine and the power grid side only has a charging function, and does not have a feedback function to the power grid side or even a function of supplying power to an alternating current load, so that the management of the flow direction of electric energy is lacked, and the application of the traditional composite energy storage system to the hidden pantograph hybrid electric machine is also limited.
Therefore, it is urgently needed to design an electromechanical composite energy storage system suitable for a hidden pantograph vehicle to overcome the defects of battery pack damage and low electric energy management efficiency.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
Based on the above, the utility model provides an electromechanical composite energy storage system, which is used for solving the bottleneck problem of a conventional single storage battery energy storage system or a super capacitor and storage battery pack energy storage system, optimizing electromechanical energy flow management and expanding the application range of an electromechanical system.
(II) technical scheme
In order to solve the technical problem, the utility model provides an electromechanical composite energy storage system which comprises a storage battery pack, a super capacitor, a first bidirectional DC/DC converter, a second bidirectional DC/DC converter, a bypass switch, a direct current bus, a four-quadrant converter, an electromechanical device and an alternating current power distribution network, wherein the storage battery pack is connected with the direct current bus through the first bidirectional DC/DC converter, the super capacitor is connected with the direct current bus through the second bidirectional DC/DC converter and the bypass switch, two sides of the second bidirectional DC/DC converter are connected with the bypass switch in parallel, the direct current bus is connected with the alternating current power distribution network through the four-quadrant converter, and the direct current bus is connected with the electromechanical device.
Further, the electric machine is a hidden pantograph hybrid electric vehicle.
Further, the bypass switch is a circuit breaker, a contactor or a solid-state fast switch.
Further, the electric machine includes a drive system and a generator, the drive system is connected to the dc bus through an inverter, and the generator is connected to the dc bus through a rectifier.
Further, the drive system includes an electric motor and an engine.
Further, the motor is a conventional asynchronous motor or an alternating current permanent magnet synchronous motor.
Furthermore, the four-quadrant converter is controlled in a PWM control mode.
Further, the first bidirectional DC/DC converter and the second bidirectional DC/DC converter are both non-isolated DC/DC converters.
(III) advantageous effects
Compared with the prior art, the electromechanical composite energy storage system adopts the super capacitor and the storage battery pack as the hybrid energy storage unit, and solves the problems that the conventional super capacitor and storage battery pack scheme is not flexible in control mode and poor in direct current bus controllability; the interconnection of the super capacitor and the direct current bus adopts a bidirectional DC/DC converter and bypass switch mode, so that the direct current bus control is optimized; the four-quadrant converter unit is adopted on the power grid side, the capacity of energy feedback to the power grid side is achieved, and the applicability is provided for the hidden pantograph hybrid power machine.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the utility model in any way, and in which:
fig. 1 is a block diagram of a composite energy storage system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a four-quadrant converter according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an inverter according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a bi-directional DC/DC converter according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The utility model provides a novel hybrid power mechanical energy flow system, which solves the problem that a direct current bus in a scheme of a super capacitor and a storage battery pack is uncontrollable, has the capability of feeding energy back to a power grid, provides a four-quadrant converter on the grid side, has the capability of energy bidirectional flow, and provides application possibility for mechanical equipment such as a hidden pantograph hybrid electric vehicle.
As shown in fig. 1, the electromechanical composite energy storage system of the present invention includes a storage battery pack, a super capacitor, a first bidirectional DC/DC converter, a second bidirectional DC/DC converter, a bypass switch, a DC bus, a four-quadrant converter, an electric machine, and an ac power distribution network, wherein the storage battery pack is connected to the DC bus through the first bidirectional DC/DC converter, the super capacitor is connected to the DC bus through the second bidirectional DC/DC converter and the bypass switch, two sides of the second bidirectional DC/DC converter are connected in parallel to the bypass switch, the DC bus is connected to the ac power distribution network through the four-quadrant converter, and the DC bus is connected to the electric machine. Further, the bypass switch is one of a circuit breaker, a contactor and a solid-state fast switch.
In the composite energy storage system, the whole composite energy storage system takes a direct current bus as a middle energy storage unit, and composite flow management of energy is realized. When the alternating-current power distribution network is used for charging or power is supplied to a hidden pantograph type vehicle (or other electric machines) through the power distribution network, the direct-current bus is charged through the four-quadrant converter, so that the energy feedback channel can be ensured to supply power to electric equipment when the motor is braked, electric energy feedback can be directly carried out on the hidden pantograph type vehicle to the alternating-current power distribution network, and the load of a power grid is reduced. In addition, the composite energy storage system adopts a super capacitor and storage battery energy storage mode, the storage battery pack is connected with the direct current bus by adopting a bidirectional DC/DC converter, and the converter is controlled by the energy storage controller.
The control method of the composite energy storage system can use other control methods of the super capacitor in the prior art, such as: when the storage battery is used for providing energy, the storage battery pack charges the direct current bus, and when the energy is recovered, the storage battery pack is charged. The super capacitor and the direct current bus are connected with the direct current bus through the bidirectional DC/DC converter and the bypass switch, the bypass switch is closed when the vehicle is started and in a rapid acceleration state, the super capacitor is connected with the direct current bus in parallel, and the super capacitor directly provides instantaneous large current to drive the motor; in the early stage of the braking state, the bypass switch is still in a closed state, and the feedback energy is directly used for charging the super capacitor; and in the deep braking state, the voltage of the direct-current bus reaches the voltage limit value of the super capacitor, the bypass switch is switched off at the moment, and the super capacitor charges the storage battery pack through the bidirectional DC/DC converter. The system combines the existing control mode to avoid the defect of poor voltage controllability of the direct current bus in the scheme of directly connecting the super capacitor and the direct current bus in parallel, and simultaneously can reduce the bidirectional DC/DC capacity and reduce the volume and the cost.
Further, in fig. 1, the hybrid-based electric machine of the present invention has a motor and an engine as a driving system, and includes a driving system and a generator, wherein the driving system is connected to a dc bus through an inverter, and the generator is connected to the dc bus through a rectifier. Further, the driving system comprises an electric motor and an engine, and the engine is a fuel engine.
In the electric mode, the direct current bus provides electric energy for the motor through the inverter to drive the machine to move forward; in the braking mode, the motor raises the direct current bus through the inverter to carry out energy feedback flow. In the fuel oil driving mode, the engine runs to drive the machine to move forward, meanwhile, the small generator generates electricity, and the rectifier transmits electric energy to the direct current bus to charge the composite energy storage system. The whole energy flow process is controlled by the whole vehicle controller and the energy management system.
As shown in fig. 2, the schematic diagram is a typical schematic diagram of a four-quadrant converter, which can be used universally for a single-phase power grid or a three-phase power grid, a control circuit of the four-quadrant converter adopts a PWM control mode, the four-quadrant converter includes a three-phase full bridge circuit composed of six switching tubes, so as to ensure the voltage controllability of a dc bus when the power grid is connected, and meanwhile, the four-quadrant converter has a bidirectional electric energy flow characteristic, and can feed energy back to the power grid, thereby reducing the load of the power grid, or directly carry ac power equipment, thereby providing a new application range for a hidden pantograph-type machine.
As shown in fig. 3, which is a schematic diagram of a typical three-phase inverter, a load motor as a motor is a conventional asynchronous motor, an ac permanent magnet synchronous machine, etc., and can be driven by a main motor covering a conventional electric machine, the motor is powered by a dc bus when going forward, and when the motor is braked, the motor generates a counter electromotive force, and the dc bus voltage is directly raised by an anti-parallel diode of a switching tube T1-T6, so as to perform energy feedback.
As shown in fig. 4, which is a schematic diagram of a typical bidirectional DC/DC converter, both bidirectional DC/DC converters may be preferably non-isolated DC/DC converters, which have a simple structure, a small volume and a low cost; the output voltage regulation range is wide, and when the motor needs to be driven to operate, the storage battery pack or the super capacitor provides electric energy for the direct current bus; when the motor is braked, the direct current bus charges the storage battery pack or the super capacitor. The bypass switch is also connected in parallel between the input side and the output side of the bidirectional DC/DC converter of the super capacitor, so that the direct current bus is efficiently controlled according to the requirement.
It should be noted that the operation modes that the electromechanical hybrid energy storage system can support are not limited to the above-described modes, and those skilled in the art can fully expand or adjust the modes according to the actual conditions and needs of the controlled object.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope defined by the appended claims.
Claims (8)
1. The electromechanical composite energy storage system is characterized by comprising a storage battery pack, a super capacitor, a first bidirectional DC/DC converter, a second bidirectional DC/DC converter, a bypass switch, a direct current bus, a four-quadrant converter, an electric machine and an alternating current power distribution network, wherein the storage battery pack is connected with the direct current bus through the first bidirectional DC/DC converter, the super capacitor is connected with the direct current bus through the second bidirectional DC/DC converter and the bypass switch, two sides of the second bidirectional DC/DC converter are connected with the bypass switch in parallel, the direct current bus is connected with the alternating current power distribution network through the four-quadrant converter, and the direct current bus is connected with the electric machine.
2. The electromechanical hybrid energy storage system of claim 1, wherein the electromechanical is a concealed pantograph hybrid vehicle.
3. The electromechanical composite energy storage system of claim 1, wherein the bypass switch is a circuit breaker, a contactor, or a solid state fast switch.
4. The electromechanical composite energy storage system according to claim 1 or 2, characterized in that the electromechanical machine comprises a drive system and a generator, the drive system is connected to the dc bus through an inverter, and the generator is connected to the dc bus through a rectifier.
5. The electromechanical composite energy storage system of claim 4, wherein said drive system comprises an electric motor and an engine.
6. The electromechanical composite energy storage system of claim 5, wherein the electric motor is an asynchronous motor or an alternating current permanent magnet synchronous motor.
7. The electromechanical composite energy storage system of claim 1, wherein said four-quadrant inverter is controlled using PWM control.
8. The electromechanical composite energy storage system of claim 1, wherein the first bidirectional DC/DC converter and the second bidirectional DC/DC converter are both non-isolated DC/DC converters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121330272.XU CN216069627U (en) | 2021-06-15 | 2021-06-15 | Compound energy storage system of electric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121330272.XU CN216069627U (en) | 2021-06-15 | 2021-06-15 | Compound energy storage system of electric machine |
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| Publication Number | Publication Date |
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| CN216069627U true CN216069627U (en) | 2022-03-18 |
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| CN202121330272.XU Active CN216069627U (en) | 2021-06-15 | 2021-06-15 | Compound energy storage system of electric machine |
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- 2021-06-15 CN CN202121330272.XU patent/CN216069627U/en active Active
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| GR01 | Patent grant | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20231205 Address after: Room 301, A elevator, Building 4-2, Xiamen New Economy Industrial Park, No. 50 Yungu Road, Tong'an District, Xiamen City, Fujian Province, 361000 Patentee after: Fujian Jingong New Energy Technology Co.,Ltd. Address before: 410100 room 701, 7 / F, scientific research building, 236 Lixiang East Road, Changsha area, free trade pilot zone, Changsha, Hunan Province Patentee before: Hunan Changfeng Heavy Industry Technology Co.,Ltd. |
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