Multi-energy coupled hybrid power system

Abstract

The utility model discloses a multi-energy coupled hybrid power system. The system comprises a plurality of energy storage devices, a control module and two sets of direct current buses, the plurality of energy storage devices comprise generator sets, photovoltaic cells and storage batteries, the output ends of the generator sets are connected with the two sets of direct current buses through rectification equipment, the photovoltaic cells are connected with the two sets of direct current buses through one-way DC / DC modules, the storage batteries are connected with the two sets of direct current buses, and the control module is connected with the two sets of direct current buses. The two sets of direct current buses are connected with the auxiliary equipment, the two sets of direct current buses are connected with the traction motor through the bidirectional DC / AC module, and the control end of the control module is respectively connected with the control ends of the rectification equipment, the unidirectional DC / DC module and the bidirectional DC / AC module. Various energy storage devices such as the generator, the storage battery and the photovoltaic battery are adopted to provide power for the locomotive, the energy consumption of the locomotive can be reduced through multi-energy coupling, and the energy utilization efficiency of the locomotive and the economical efficiency of the whole locomotive are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy, and in particular relates to a multi-energy coupled hybrid power system. Background Art

[0002] The traction system is the core of a train's transmission system, responsible for providing the train's driving force. Currently, diesel locomotive traction systems are primarily powered by diesel generators, which convert the alternating current (AC) generated by the diesel engine into the DC power required by the DC motor through an AC-to-DC conversion process. This power supply method is limited, results in significant energy loss during the conversion process, and poses environmental risks. Utility Model Content

[0003] The purpose of the present invention is to solve the deficiencies in the above-mentioned background technology and to provide a multi-energy coupled hybrid power system.

[0004] The technical solution adopted by the utility model is: a multi-energy coupled hybrid power system, including multiple energy storage devices, a control module and two sets of DC bus bars, wherein the multiple energy storage devices include generator sets, photovoltaic cells and batteries.

[0005] The output end of the generator set is connected to two sets of DC busbars through a rectifier device.

[0006] The photovoltaic cells are connected to two sets of DC buses through a unidirectional DC / DC module.

[0007] The battery is connected to two sets of DC bus bars.

[0008] The two sets of DC bus connection auxiliary equipment,

[0009] The two sets of DC buses are connected to the traction motors via a bidirectional DC / AC module.

[0010] The control end of the control module is connected to the control end of the rectifier device, the unidirectional DC / DC module and the bidirectional DC / AC module respectively.

[0011] Furthermore, two batteries are provided, and the two batteries are respectively connected to two sets of DC busbars.

[0012] Furthermore, the battery is connected to the DC bus through a bidirectional DC / DC module.

[0013] Furthermore, isolation switches are provided between the rectifier device, the unidirectional DC / DC module, the bidirectional DC / DC module and the bidirectional DC / AC module and the two sets of DC busbars.

[0014] Furthermore, the charging end of the battery is connected to a charging interface.

[0015] Furthermore, the multiple energy storage devices also include a fuel cell, and the output end of the fuel cell is connected to two sets of DC buses through a unidirectional DC / DC module.

[0016] Furthermore, the rectifier device is a unidirectional AC / DC module or an uncontrolled rectifier module.

[0017] Furthermore, the auxiliary equipment includes an AC auxiliary equipment, and the two sets of DC buses are connected to the AC auxiliary equipment via a unidirectional DC / AC module.

[0018] Furthermore, the auxiliary equipment includes a DC auxiliary equipment, and the two sets of DC buses are connected to the DC auxiliary equipment via a unidirectional DC / DC module.

[0019] The beneficial effects of the utility model are:

[0020] The hybrid power system of the present invention adopts multiple energy storage devices such as generators, batteries, photovoltaic cells, etc. to provide power for the locomotive. The power distribution of each energy storage device is controlled by a control module. The generator serves as the main power source of the locomotive, the battery can both output electrical energy and store excess energy, and the photovoltaic cell can provide green and environmentally friendly clean energy. Through the coupling of multiple energy sources, the energy consumption of the locomotive can be reduced, and the energy utilization efficiency of the locomotive and the economy of the entire vehicle can be improved.

[0021] The energy storage device of the present invention also includes a fuel cell, which can provide power for the locomotive. The fuel cell has the advantages of high-efficiency energy conversion, environmental protection and pollution-free, flexibility and scalability, further realizing the effective use of energy.

[0022] The utility model provides an isolating switch between each energy storage device and the DC bus. When the corresponding energy storage device needs to be repaired or fails, it can be disconnected from the line through the isolating switch to ensure the normal operation of the locomotive.

[0023] The utility model provides two batteries. When one of the battery packs fails and needs to be replaced, it can be disconnected from the circuit and the other battery pack can be connected to the DC bus for energy storage and discharge, ensuring that no voltage fluctuation of the DC bus is caused.

[0024] The utility model provides a charging interface at the battery charging end, and the battery can be charged through the DC bus or connected to a charging pile for charging, so that the energy storage and power supply are more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the principle of Example 1 of the present utility model.

[0026] Figure 2 This is a schematic diagram of the principle of Example 2 of the present utility model.

[0027] In the figure, 1-generator set; 2-battery; 3-photovoltaic cell; 4-fuel cell; 5-uncontrolled rectifier module; 6-diode unidirectional isolation module; 7-unidirectional DC / DC module; 8-unidirectional DC / AC module; 9-bidirectional DC / AC module; 10-isolating switch; 11-AC auxiliary equipment; 12-DC auxiliary equipment; 13-traction motor; 14-DC bus; 15-unidirectional AC / DC module; 16-bidirectional DC / DC module. DETAILED DESCRIPTION

[0028] The following further describes specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the descriptions of these embodiments are intended to facilitate understanding of the present invention and do not constitute limitations on the present invention. Furthermore, the technical features involved in the various embodiments of the present invention described below may be combined with one another as long as they do not conflict with one another.

[0029] Example 1

[0030] like Figure 1 As shown, this embodiment provides a multi-energy coupled hybrid power system, including multiple energy storage devices and a control module (not shown in the figure) and two sets of DC busbars 14. The two sets of DC busbars are respectively installed on different bogies of the train. The two sets of DC busbars are independent of each other and not connected. The multiple energy storage devices include a generator set 1, a battery 2, and a photovoltaic cell 3. Each energy storage device can be provided with one or more according to actual application requirements.

[0031] The generator set is connected to the DC bus via a rectifier. Different rectifiers are used in different applications, such as uncontrolled rectifier modules and unidirectional AC / DC modules. In this embodiment, the output of the generator set 1 is connected to two sets of DC buses 14 via an uncontrolled rectifier module 5. Both batteries 2 are directly connected to the two sets of DC buses 14. Energy is directly transferred between the batteries 2 and the DC buses 14, and the DC bus 14 voltage fluctuates with the voltage of the batteries 2.

[0032] The photovoltaic cell 3 is connected to two sets of DC busbars 14 via a unidirectional DC / DC module 7 .

[0033] In this embodiment, the auxiliary equipment includes an AC auxiliary device 11 and a DC auxiliary device 12. Two sets of DC busbars 14 are connected to the AC auxiliary device 11 via a unidirectional DC / AC module 8, and two sets of DC busbars 14 are connected to the DC auxiliary device 12 via a unidirectional DC / DC module 7. The two sets of DC busbars 14 are connected to the traction motor 13 via a bidirectional DC / AC module 9. The control terminal of the control module is respectively connected to the control terminals of the uncontrolled rectifier module 5, the unidirectional DC / DC module 7, the unidirectional DC / AC module 8, and the bidirectional DC / AC module 9.

[0034] It is understood that two batteries 2 are provided, each independently connected to the DC bus. The two sets of DC busses do not affect each other. If one battery pack fails, the other battery pack and DC bus can continue to operate normally. A charging port is also provided at the battery charging end, allowing the battery to be charged either via the DC bus or connected to a charging station, making energy storage and power supply more reliable. Depending on actual work requirements, an isolating switch may or may not be provided between the battery and the DC bus.

[0035] It should be noted that in this embodiment, the train has multiple traction motors, with multiple traction motors installed on a single bogie. A single set of DC busbars provides power to the corresponding bogies. The DC busbars are connected to one or more traction motors on the corresponding bogies, meaning each traction motor is individually connected to one of the DC busbars. The corresponding AC and DC auxiliary devices are connected in the same manner. There are several types of auxiliary devices on the train, and each corresponding auxiliary device (AC or DC) is connected to a corresponding DC busbar, meaning each auxiliary device is individually connected to one of the DC busbars.

[0036] The hybrid power system of the present invention uses a variety of energy storage devices such as generators, batteries, and photovoltaic cells to provide power for the locomotive. The power distribution of each energy storage device is controlled by a control module. The battery serves as the main power source of the locomotive. The battery can both output electrical energy and store excess energy. The photovoltaic cell can provide green and environmentally friendly clean energy. The generator is mainly used to deal with emergencies. The coupling of multiple energy sources can reduce the energy consumption of the locomotive, improve the energy utilization efficiency of the multi-energy coupled locomotive and the economy of the entire vehicle. When the locomotive is in traction mode, the traction motor converts the input electrical energy into mechanical energy; when the locomotive needs to brake, the traction motor can convert the mechanical energy of the train into electrical energy to generate braking force. The simultaneous provision of two sets of DC busbars can improve the reliability of the train's power supply and facilitate maintenance and inspection.

[0037] It is understood that the multiple energy storage devices also include a fuel cell 4, the output end of which is connected to two sets of DC buses 14 via a unidirectional DC / DC module 7. Providing power to the locomotive through fuel cells can improve overall energy utilization efficiency.

[0038] It is understandable that an isolating switch 10 is provided between the uncontrolled rectifier 5, the unidirectional DC / DC module 7, the unidirectional DC / AC module 8, and the bidirectional DC / AC module 9 and the DC bus 14, and the control end of the control module is electrically connected to the control end of the isolating switch. An isolating switch is provided between each energy storage device and the DC bus. When the corresponding energy storage device needs to be repaired or fails, it can be disconnected from the line through the isolating switch to ensure the normal operation of the locomotive. For different energy storage devices or loads (auxiliary equipment, traction motors, etc.), the type of isolating switch may be different. The isolating switch corresponding to the unidirectional energy transmission route is a unidirectional isolation type, and the isolating switch corresponding to the bidirectional energy transmission route is a bidirectional isolation type. For example, the isolating switch between the uncontrolled rectifier module 5 and the DC bus 14 and the isolating switch between the photovoltaic cell and the DC bus can both use a diode unidirectional isolation module 6. Only one diode unidirectional isolation module is shown in the figure. In actual application, each generator set, each photovoltaic cell, etc. is connected to the DC bus through a diode unidirectional isolation module.

[0039] The energy storage device is not limited to the above types, and may also include energy storage devices of other energy forms, such as energy storage devices of other clean energy.

[0040] It can be understood that the auxiliary equipment includes conventional electrical equipment such as fans and water pumps, and the generators, batteries, photovoltaic cells, control modules, traction motors, unidirectional AC / DC modules, unidirectional DC / DC modules, unidirectional DC / AC modules, bidirectional DC / DC modules and bidirectional DC / AC modules are all existing conventional equipment.

[0041] If the control module is a conventional central processing unit (CPU), which can control the working status of each energy storage device, you can choose a Feiteng CPU or Siemens PLC control module. The isolating switch can be a GWDCD series isolating switch.

[0042] A unidirectional DC / DC module converts the input DC voltage into the required output DC voltage. It includes basic rectification and filtering circuits, and may also include other functional devices such as current limiting and protection.

[0043] A bidirectional DC / DC module (or bidirectional DC / DC converter) enables bidirectional energy transfer between two DC systems with different voltage levels. It can convert electrical energy from a high-voltage side to a low-voltage side, and can also work in reverse, converting electrical energy from a low-voltage side to a high-voltage side. A bidirectional DC / DC module typically consists of two half-bridge circuits. Each half-bridge circuit contains a switching device (such as a MOS transistor or IGBT) and a diode. When the switch is on, current flows from the input to the output, and the diode is in reverse blocking. When the switch is off, the diode conducts, and current flows from the output to the input.

[0044] Example 2

[0045] like Figure 2 As shown, this embodiment provides a multi-energy coupled hybrid system, including multiple energy storage devices and a control module (not shown) and two sets of DC bus bars. The multiple energy storage devices include a generator set 1, two batteries 2, and a photovoltaic cell 3. The connections of the various devices in this embodiment are basically the same as those in Example 1 and will not be described in detail here.

[0046] The difference is that in this embodiment, the two batteries 2 are connected to two sets of DC busbars 14 via two bidirectional DC / DC modules 16. That is, one battery 2 is connected to one set of DC busbars 14 via one bidirectional DC / DC module 16, and the other battery 2 is connected to the other set of DC busbars 14 via another bidirectional DC / DC module 16. In this embodiment, the batteries 2 are connected to the DC busbars 14 via bidirectional DC / DC modules 16. The bidirectional DC / DC modules 16 perform high-to-low voltage conversion, enabling energy transfer between the batteries 2 and the DC busbars 14. In this case, the batteries output a fixed voltage. To accommodate this operating condition, the output end of the generator set 1 is connected to both sets of DC busbars 14 via a unidirectional AC / DC module 15.

[0047] The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited to this. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included in the scope of protection of the present invention. Matters not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A multi-energy coupled hybrid power system, characterized by: It includes multiple energy storage devices, a control module and two sets of DC bus bars. The multiple energy storage devices include generator sets, photovoltaic cells and batteries. The output end of the generator set is connected to two sets of DC busbars through a rectifier device. The photovoltaic cells are connected to two sets of DC buses through a unidirectional DC / DC module. The battery is connected to two sets of DC bus bars. The two sets of DC bus connection auxiliary equipment, The two sets of DC buses are connected to the traction motors via a bidirectional DC / AC module. The control end of the control module is connected to the control end of the rectifier device, the unidirectional DC / DC module and the bidirectional DC / AC module respectively.

2. The multi-energy coupled hybrid power system according to claim 1, characterized in that: There are two batteries, and the two batteries are respectively connected to two sets of DC busbars.

3. The multi-energy coupled hybrid power system according to claim 1, characterized in that: The battery is connected to the DC bus through a bidirectional DC / DC module.

4. The multi-energy coupled hybrid power system according to claim 3, characterized in that: Isolating switches are provided between the rectifier device, the unidirectional DC / DC module, the bidirectional DC / DC module and the bidirectional DC / AC module and the two sets of DC bus bars.

5. The multi-energy coupled hybrid power system according to claim 1, characterized in that: The charging end of the battery is connected to a charging interface.

6. The multi-energy coupled hybrid power system according to claim 1, characterized in that: The multiple energy storage devices further include a fuel cell, and the output end of the fuel cell is connected to two sets of DC buses via a unidirectional DC / DC module.

7. The multi-energy coupled hybrid power system according to claim 1, characterized in that: The rectifier device is a unidirectional AC / DC module or an uncontrolled rectifier module.

8. The multi-energy coupled hybrid power system according to claim 1, characterized in that: The auxiliary equipment includes an AC auxiliary equipment, and the two sets of DC buses are connected to the AC auxiliary equipment via a unidirectional DC / AC module.

9. The multi-energy coupled hybrid power system according to claim 1, characterized in that: The auxiliary equipment includes a DC auxiliary equipment, and the two sets of DC bus bars are connected to the DC auxiliary equipment via a unidirectional DC / DC module.

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