Multi-source power system, driving method, braking energy recovery method and vehicle

Abstract

This application provides a multi-source power system, a driving method, a braking energy recovery method, and a vehicle. The multi-source power system includes a catenary, an energy storage device, and a traction motor. The catenary and energy storage device are connected in parallel. The outputs of the catenary and energy storage device are respectively connected to the inputs of the traction motor to drive its operation. The output of the traction motor is connected to the inputs of both the energy storage device and the catenary. The energy storage device recovers braking energy under a first operating condition, and the catenary recovers braking energy under a second operating condition. By connecting the output of the traction motor to the inputs of both the energy storage device and the catenary, the traction motor can supply electrical energy to the energy storage device and the catenary during vehicle braking. This enables the multi-source power system to recover and utilize braking energy during vehicle braking, reducing energy loss, improving fuel efficiency, lowering vehicle operating costs, and increasing economic benefits.

Description

Technical Field

[0001] This application belongs to the field of hybrid power technology, specifically relating to a multi-source power system, a driving method, a braking energy recovery method, and a vehicle. Background Technology

[0002] With the rapid development of vehicles, vehicle drive modes have become increasingly diversified. Vehicle drive methods include: pure engine drive, pure electric drive, and hybrid drive (engine and motor). Pure engine drive has high fuel consumption; with rising global temperatures, there are higher requirements for engine carbon emissions, and with rising oil prices, the operating cost of pure engine mode is further increased. Pure electric mode is less commonly used in large-tonnage vehicles; to meet the needs of the entire vehicle, more power batteries need to be installed, which is too difficult and costly. Hybrid drive (engine and motor) is becoming the trend for the operation of large-tonnage vehicles, and how to improve fuel efficiency and reduce operating costs has become a research direction for various automakers.

[0003] Currently, large-tonnage vehicles mostly operate by using an engine to drive a generator to generate electricity, which then powers the traction motor to drive the vehicle. When the vehicle brakes, the electricity generated by the traction motor cannot be recovered and is usually consumed by the heat generated by the braking resistor, resulting in a significant waste of braking energy and low economic efficiency. Summary of the Invention

[0004] Therefore, the technical problem to be solved by this application is to provide a multi-source power system, a driving method, a braking energy recovery method, and a vehicle, wherein the multi-source power system can recover and utilize braking energy, thereby improving economic efficiency.

[0005] To address the aforementioned problems, a first aspect of this application provides a multi-source power system, including a catenary, an energy storage device, and a traction motor. The catenary and the energy storage device are connected in parallel. The output terminals of the catenary and the energy storage device are respectively connected to the input terminal of the traction motor to drive the traction motor. The output terminal of the traction motor is connected to the input terminal of the energy storage device and the input terminal of the catenary. The energy storage device is used to recover braking energy under a first operating condition, and the catenary is used to recover the braking energy under a second operating condition.

[0006] Optionally, the multi-source power system further includes a generator unit, which is connected in parallel with the overhead contact line. The output end of the overhead contact line is connected to the input end of the traction motor through a pantograph system, and the output end of the generator unit is connected to the input end of the traction motor through a traction converter.

[0007] The power generation unit includes a first power generation unit, a second power generation unit, and a third power generation unit, which are connected in parallel.

[0008] When the input power of the traction motor is greater than the first threshold, the first power generation unit is activated;

[0009] When the input power of the traction motor is greater than the second threshold, the second power generation unit is activated;

[0010] The third power generation unit is activated when the input power of the traction motor is greater than the third threshold.

[0011] Optionally, the multi-source power system further includes a braking resistor, the input terminal of which is connected to the output terminal of the traction motor, and the braking resistor is used to recover the braking energy under the third operating condition.

[0012] Optionally, the multi-source power system further includes a cooling unit, the input end of which is connected to the output end of the traction motor. The cooling unit includes a first cooling unit, a second cooling unit, and a third cooling unit. The first cooling unit and the second cooling unit are used to cool the braking resistor, and the third cooling unit is used to cool the traction motor.

[0013] A second aspect of this application provides a vehicle including the multi-source power system as described above.

[0014] A third aspect of this application provides a driving method for driving the vehicle described above, the vehicle further comprising a controller for controlling the operation of the energy storage device and the power generation unit according to the throttle opening, the method comprising:

[0015] The overhead contact line and the pantograph system are activated to supply electrical energy to the traction motor;

[0016] The controller compares the output power of the overhead contact line with the input power of the vehicle;

[0017] When the output power of the overhead contact line is less than the input power of the vehicle, the energy storage device is activated to supply electrical energy to the traction motor.

[0018] Optionally, the method further includes:

[0019] When the total output power of the overhead contact line and the energy storage device is less than the input power of the vehicle, the generator is activated to supply electrical energy to the traction motor.

[0020] Optionally, when the total output power of the overhead contact line and the energy storage device is less than the input power of the vehicle, starting the generator to supply electrical energy to the traction motor further includes:

[0021] The first power generation unit, the second power generation unit, and the third power generation unit are started sequentially until the total output power of the contact network, the energy storage device, and the power generation unit is greater than or equal to the input power of the vehicle.

[0022] A fourth aspect of this application provides a braking energy recovery method for recovering braking energy from the aforementioned vehicle, the method comprising:

[0023] During the vehicle braking process, the traction motor supplies electrical energy to the energy storage device;

[0024] When the braking energy is greater than the rated capacity of the energy storage device, the traction motor supplies electrical energy to the overhead contact line.

[0025] Optionally, the method further includes:

[0026] When the braking energy is greater than the total rated capacity of the energy storage device and the overhead contact line, the traction motor supplies electrical energy to the braking resistor.

[0027] One of the above technical solutions has the following beneficial effects.

[0028] The embodiments of this invention provide a multi-source power system, a driving method, a braking energy recovery method, and a vehicle. The multi-source power system connects the output terminal of the traction motor to the input terminals of an energy storage device and the overhead contact line, respectively, so that the traction motor can supply electrical energy to the energy storage device and the overhead contact line when the vehicle brakes. In the prior art, the electrical energy generated by the traction motor during vehicle braking cannot be recovered and can only be consumed through the heating of the braking resistor. Since vehicles brake frequently during operation, the total braking energy is large, and consuming it through the braking resistor wastes a significant amount of energy, increasing vehicle operating costs. Compared with the prior art, in this application, the energy storage device can recover braking energy under a first operating condition, and the overhead contact line can recover braking energy under a second operating condition. This enables the multi-source power system to recover and utilize braking energy during vehicle braking, reducing energy loss, improving fuel efficiency, lowering vehicle operating costs, and increasing economic benefits. Furthermore, the multi-source power system in this application has a high degree of integration, which is conducive to its widespread use. The vehicle drive method involves sequentially activating the overhead contact line, energy storage device, first power generation unit, second power generation unit, and third power generation unit. This allows the vehicle to switch between different drive modes based on its speed and the weight of the ore, reducing energy consumption, improving fuel efficiency, and lowering operating costs. The vehicle's braking energy recovery method utilizes the energy storage device to recover braking energy during braking operations. The overhead contact line continues to recover braking energy when the energy storage device reaches its rated capacity. This enables multiple types of braking energy recovery and utilization during emergency braking in mining operations, further reducing energy consumption, lowering operating costs, and improving economic efficiency. Attached Figure Description

[0029] Figure 1 A schematic diagram of a multi-source power system according to an embodiment of the present invention;

[0030] Figure 2 A flowchart of a vehicle driving method according to an embodiment of the present invention;

[0031] Figure 3 A flowchart of a vehicle braking energy recovery method according to an embodiment of the present invention.

[0032] The reference numerals in the attached figures are as follows:

[0033] 1. Overhead contact wire; 2. Pantograph system; 3. Generator unit; 31. First generator unit; 32. Second generator unit; 33. Third generator unit; 4. Traction converter; 41. Rectifier; 42. Inverter; 5. Traction motor; 6. Braking resistor; 7. Cooling unit; 71. First cooling unit; 72. Second cooling unit; 73. Third cooling unit; 8. Energy storage device. Detailed Implementation

[0034] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0038] See also Figure 1 As shown, according to one aspect of the embodiments of this application, a multi-source power system is provided, including a catenary 1, an energy storage device 8, and a traction motor 5. The catenary 1 and the energy storage device 8 are arranged in parallel. The output ends of the catenary 1 and the energy storage device 8 are respectively connected to the input ends of the traction motor 5 to drive the traction motor 5 to run. The output ends of the traction motor 5 are respectively connected to the input ends of the energy storage device 8 and the input ends of the catenary 1. The energy storage device 8 is used to recover braking energy under a first operating condition, and the catenary 1 is used to recover braking energy under a second operating condition.

[0039] By connecting the output of the traction motor 5 to the input of the energy storage device 8 and the contact wire 1 respectively, the traction motor 5 can supply electrical energy to the energy storage device 8 and the contact wire 1 when the vehicle brakes. In the prior art, the electricity generated by the traction motor 5 during vehicle braking cannot be recovered and can only be consumed by the heat generated by the braking resistor 6. Since the vehicle brakes frequently during operation, the total braking energy is large. If it is consumed by the braking resistor 6, a large amount of energy is wasted, increasing the vehicle's operating costs. Compared with the prior art, in this application, the energy storage device 8 can recover braking energy under the first operating condition, and the contact wire 1 can recover braking energy under the second operating condition. This enables the multi-source power system to recover and utilize braking energy during vehicle braking, reducing energy loss, improving fuel efficiency, lowering vehicle operating costs, and improving economic benefits. At the same time, the multi-source power system in this application has a high degree of integration, which is conducive to its widespread use.

[0040] Among them, the contact wire 1 can be a power grid. The output end of the contact wire 1 is connected to the input end of the traction motor 5. The contact wire 1 is used to transmit electrical energy to the traction motor 5 and drive the traction motor 5 to run under driving conditions.

[0041] The traction motor 5 is used to connect to the drive wheel axle of the vehicle and drive it to rotate. In this embodiment, two traction motors 5 are provided and connected in parallel. The output end of the energy storage device 8 is connected to the input end of the two traction motors 5 respectively.

[0042] The multi-source power system also includes an energy storage device 8, which can be a power battery pack or something similar, as long as it can store electrical energy. This application does not impose any further limitations.

[0043] Specifically, the input terminal of the energy storage device 8 is connected to the output terminal of the traction motor 5, and the energy storage device 8 can store the braking energy output by the traction motor 5. In this embodiment, the energy storage device 8 is used to recover braking energy under the first operating condition, so that the electricity generated by the traction motor 5 during vehicle braking can be stored through the energy storage device 8, so as to avoid the braking energy being consumed by heat through the braking resistor 6, thereby reducing energy loss and improving economic efficiency.

[0044] The first operating condition can be the state when the energy storage device 8 is less than its rated capacity when the vehicle is braking. That is, when the vehicle is braking, the traction motor 5 first supplies electrical energy to the energy storage device 8 until the energy storage device 8 reaches its rated capacity.

[0045] Understandably, the input end of the traction motor 5 is also connected to the output end of the energy storage device 8 so that the electrical energy stored inside the energy storage device 8 can be delivered to the traction motor 5 to drive the vehicle during driving conditions.

[0046] The output end of the traction motor 5 is also connected to the input end of the overhead contact line 1, which enables the traction motor 5 to transmit electrical energy to the power grid when the vehicle is braking.

[0047] Specifically, in this embodiment, the contact wire 1 is used to recover braking energy under the second working condition. This allows the electricity generated by the traction motor 5 during vehicle braking to be recovered and reused through the contact wire 1, thereby avoiding the consumption of braking energy through the heating of the braking resistor 6, reducing energy loss, and improving economic efficiency.

[0048] The second operating condition can be the state when the energy storage device 8 reaches its rated capacity during vehicle braking. That is, when the vehicle brakes, the traction motor 5 first supplies electrical energy to the energy storage device 8 until the energy storage device 8 reaches its rated capacity, and then supplies electrical energy to the contact wire 1 until the energy in the contact wire 1 reaches its rated capacity.

[0049] In the embodiments of this application, the connection method can be electrical connection.

[0050] The multi-source power system also includes a generator unit 3, which is connected in parallel with the overhead contact line 1. The output end of the overhead contact line 1 is connected to the input end of the traction motor 5 through the pantograph system 2, and the output end of the generator unit 3 is connected to the input end of the traction motor 5 through the traction converter 4. The generator unit 3 includes a first generator unit 31, a second generator unit 32, and a third generator unit 33, which are connected in parallel. When the input power of the traction motor 5 is greater than a first threshold, the first generator unit 31 is activated; when the input power of the traction motor 5 is greater than a second threshold, the second generator unit 32 is activated; and when the input power of the traction motor 5 is greater than a third threshold, the third generator unit 33 is activated.

[0051] By setting up a generator unit 3 and connecting its output end to the input end of the traction motor 5, the generator unit 3 can supply electrical energy to the traction motor 5 to drive its operation under vehicle driving conditions. At the same time, combined with the contact network 1 and the energy storage device 8, it can provide multiple sources of power to the traction motor 5 to meet the needs of various vehicle operations, thus increasing the applicability of the multi-source power system. Meanwhile, the generator unit 3 includes a first generator unit 31, a second generator unit 32, and a third generator unit 33, and the first generator unit 31, the second generator unit 32, and the third generator unit 33 are started sequentially according to the vehicle's operating status, which can avoid energy waste, improve the fuel efficiency of vehicle operation, reduce vehicle operating costs, and improve economic benefits.

[0052] Among them, the power generation unit 3 can be an engine unit, and the power generation unit 3 is set in parallel with the contact wire 1. The power generation unit 3 is another power source for the traction motor 5.

[0053] In this embodiment of the application, the traction motor 5 has multiple power sources, including the overhead contact line 1, the energy storage device 8, and the power generation unit 3.

[0054] Specifically, the output end of the generator 3 is connected to the input end of the traction motor 5 through the traction converter 4. The traction converter 4 includes a rectifier 41 and an inverter 42. The rectifier 41 is located at the output end of the generator 3 to convert the three-phase AC power of the generator 3 into two-phase DC power. The inverter 42 is located at the input end of the traction motor 5 to filter the current transmitted by the generator 3 so that the current and voltage of the two-phase DC power become smoother.

[0055] The output end of the contact wire 1 is connected to the input end of the traction motor 5 through the pantograph system 2. The pantograph system 2 can be an electrical device that obtains power from the contact wire 1 and can be installed on the roof of the vehicle.

[0056] Specifically, an inverter 42 is also installed at the pantograph system 2 to adjust the voltage of the current transmitted by the contact wire 1 to adapt to the working voltage of the traction motor 5 so that the traction motor 5 can drive the vehicle.

[0057] The vehicle's driving conditions include pure electric drive mode and hybrid drive mode.

[0058] Specifically, when the vehicle is in motion, if the electricity generated by the overhead contact line 1 exceeds the vehicle's demand, the vehicle operates in pure grid-driven mode. In this mode, the overhead contact line 1 provides DC power to the vehicle through the pantograph system 2, and the inverter 42 performs voltage boosting and scaling to power the traction motor 5, driving the vehicle. Excess electricity is then supplied to the energy storage device 8 via the inverter 42. When the electricity generated by the overhead contact line 1 is less than the vehicle's demand, the vehicle operates in hybrid mode. In this mode, the overhead contact line 1 first supplies power to the entire vehicle, and then the electricity generated by the generator 3 and the energy storage device 8 together supply power to the traction motor 5 to drive the vehicle. The specific strategy is that if the pure grid-driven mode does not meet the vehicle's demand, the energy storage device 8 is activated to supply power; if this still does not meet the vehicle's demand, the generator 3 is activated to supply power.

[0059] The power generation unit 3 includes a first power generation unit 31, a second power generation unit 32, and a third power generation unit 33. Each of the first power generation unit 31, the second power generation unit 32, and the third power generation unit 33 can be an engine. The first power generation unit 31, the second power generation unit 32, and the third power generation unit 33 are started sequentially.

[0060] Specifically, when the input power of the traction motor 5 is greater than the first threshold, the first power generation unit 31 starts; when the input power of the traction motor 5 is greater than the second threshold, the second power generation unit 32 starts; and when the input power of the traction motor 5 is greater than the third threshold, the third power generation unit 33 starts.

[0061] The input power of the traction motor 5 can be the actual power required by the vehicle.

[0062] The first threshold can be the total output power of the overhead contact line 1 and the energy storage device 8.

[0063] The second threshold can be the total output power of the overhead contact line 1, the energy storage device 8, and the first power generation unit 31.

[0064] The third threshold can be the total output power of the overhead contact line 1, the energy storage device 8, the first power generation unit 31, and the second power generation unit 32.

[0065] Specifically, when the actual power demand of the traction motor 5 is greater than the total output power of the contact wire 1 and the energy storage device 8, the first power generation unit 31 is started; when the actual power demand of the traction motor 5 is greater than the total output power of the contact wire 1, the energy storage device 8 and the first power generation unit 31, the second power generation unit 32 is started; when the actual power demand of the traction motor 5 is greater than the total output power of the contact wire 1, the energy storage device 8, the first power generation unit 31 and the second power generation unit 32, the third power generation unit 33 is started.

[0066] The first power generation unit 31, the second power generation unit 32, and the third power generation unit 33 are connected in parallel.

[0067] The multi-source power system also includes a braking resistor 6, the input of which is connected to the output of the traction motor 5. The braking resistor 6 is used to recover braking energy in the third operating condition.

[0068] By setting a braking resistor 6 and connecting its input terminal to the output terminal of the traction motor 5, when the braking energy of the vehicle exceeds the total rated capacity of the energy storage device 8 and the contact wire 1, the electrical energy can be transferred to the braking resistor 6 and dissipated through heat. This prevents the energy storage device 8 and the contact wire 1 from being damaged due to exceeding their rated capacity, extends their service life, improves the stability of the multi-source power system, and enables the multi-source power system to cope with various extreme conditions, thus increasing its applicability and facilitating its widespread use.

[0069] The braking resistor 6 is connected in parallel with the energy storage device 8.

[0070] Specifically, in this embodiment, two braking resistors 6 are provided, and the input terminals of the two braking resistors 6 are respectively connected to the output terminals of the two traction motors 5, so as to consume the electrical energy transmitted by the traction motors 5 by heating the braking resistors 6.

[0071] The multi-source power system also includes a cooling unit 7. The input end of the cooling unit 7 is connected to the output end of the traction motor 5. The cooling unit 7 includes a first cooling unit 71, a second cooling unit 72 and a third cooling unit 73. The first cooling unit 71 and the second cooling unit 72 are used to cool the braking resistor 6, and the third cooling unit 73 is used to cool the traction motor 5.

[0072] By setting up the first cooling unit 71 and the second cooling unit 72, the braking resistor 6 can be cooled, thereby improving the heat dissipation efficiency of the braking resistor 6. At the same time, by setting up the third cooling unit 73, the traction motor 5 can be cooled, so that the traction motor 5 can be kept within the set temperature, thereby improving the stability of the traction motor 5 and thus improving the stability of the vehicle using the multi-source power system.

[0073] Among them, the cooling section 7 can be a cooling fan unit.

[0074] Specifically, the cooling unit 7 includes a first cooling unit 71, a second cooling unit 72, and a third cooling unit 73, which are connected in parallel. The first cooling unit 71 and the second cooling unit 72 are connected to the same main line, and this main line is connected in parallel with the line of the third cooling unit 73. This allows the first cooling unit 71 and the second cooling unit 72 to operate synchronously, while the third cooling unit 73 operates independently. This enables the first cooling unit 71 and the second cooling unit 72 to cool the two braking resistors 6 respectively, and the third cooling unit 73 to cool the traction motor 5.

[0075] When the vehicle is running, the overhead contact line 1 provides DC power to the vehicle through the pantograph system 2. The inverter 42 performs voltage step-up and step-down to power the vehicle's traction motor 5 to drive the vehicle. Excess power is supplied to the energy storage device 8 through the inverter 42, and then to the cooling unit 7 through the inverter 42. The first cooling unit 71 and the second cooling unit 72 cool the two braking resistors 6, and the third cooling unit 73 cools the two traction motors 5.

[0076] Specifically, in this embodiment, the multi-source power system includes three rectifiers 41 and nine inverters 42. The three rectifiers 41 are respectively located at the output ends of the first power generation unit 31, the second power generation unit 32, and the third power generation unit 33. One inverter 42 is located at the output end of the pantograph system 2. Two inverters 42 are located on the input branch lines of the two traction motors 5. Two inverters 42 are located on the output branch lines of the traction motors 5. One inverter 42 is located on the main line of the output end of the traction motors 5. Three inverters 42 are located at the input ends of the first cooling unit 71, the second cooling unit 72, and the third cooling unit 73.

[0077] A second aspect of this application provides a vehicle including the aforementioned multi-source power system.

[0078] The vehicle can be a tram or a mining car, etc. In this embodiment, the vehicle is a mining dump truck.

[0079] Specifically, when the vehicle is driven, the overhead contact line 1 first supplies power to the traction motor 5 through the pantograph system 2 to drive the vehicle forward. If this is insufficient, the first power generation unit 31 starts operating to supply power to both traction motors 5 to drive the vehicle. If this is still insufficient, the second power generation unit 32 starts, and the process continues to determine whether the required power for the vehicle is met, until the energy storage device 8 is activated. The vehicle in this embodiment utilizes a multi-source power system, which has a high degree of integration and is safe and reliable.

[0080] See also Figure 2 As shown, in a third aspect of the embodiments of this application, a driving method is provided for driving the vehicle described above. The vehicle further includes a controller for controlling the operation of the energy storage device 8 and the power generation unit 3 according to the throttle opening.

[0081] The vehicle's speed, or rotational speed of the traction motor 5, can be adjusted by changing the throttle opening. The rotational speed of the traction motor 5 is related to its power consumption. Understandably, a larger throttle opening results in higher power consumption for the traction motor 5, and vice versa.

[0082] Among them, the overhead contact line 1, the power generation unit 3, and the energy storage device 8 are all drive units of the vehicle.

[0083] Specifically, in this embodiment, the vehicle includes a controller, which can control the operation of the energy storage device 8 and the power generation unit 3 according to the throttle opening. That is, the controller can adjust the output power of the drive unit according to the vehicle's driving speed so that the traction motor 5 has sufficient power to drive the vehicle.

[0084] Vehicle driving methods include:

[0085] Step s101: Start the overhead contact line 1 and pantograph system 2 to supply electrical energy to the traction motor 5.

[0086] Among them, the vehicle can drive in pure electric grid drive mode by relying on the overhead contact line 1 and pantograph system 2.

[0087] Specifically, when the vehicle is driven, the overhead contact line 1 first supplies power to the traction motor 5 through the pantograph system 2 to drive the vehicle. If the vehicle's driving needs are not met, the vehicle driving mode is switched to hybrid driving mode, at which time the energy storage device 8 and the generator 3 are started again.

[0088] The starting order of the energy storage device 8 and the power generation unit 3 can be changed according to the requirements. In this embodiment, the contact network 1 is started first, then the energy storage device 8 is started, and finally the power generation unit 3 is started.

[0089] Step s201: The controller compares the output power of the overhead contact line 1 with the input power of the vehicle.

[0090] The controller can be the vehicle's control host, and it is electrically connected to the vehicle's drive unit to control the operation of the drive unit.

[0091] The input power of the vehicle can be the power consumption rate of the traction motor 5 that drives the vehicle.

[0092] The output power of contact wire 1 can be the rated power of contact wire 1.

[0093] Specifically, the controller determines the power consumption rate of the traction motor 5, i.e. the input power of the vehicle, based on the throttle opening, and compares it with the output power of the overhead contact line 1. When the output power of the overhead contact line 1 is greater than the input power of the vehicle, the vehicle maintains pure grid drive mode. Otherwise, the vehicle driving mode switches to hybrid drive mode. Here, the controller controls the start and stop of the energy storage device 8 and the generator 3.

[0094] Step s301: When the output power of the overhead contact line 1 is less than the input power of the vehicle, the energy storage device 8 is activated to supply electrical energy to the traction motor 5.

[0095] Specifically, during the vehicle's acceleration, the throttle opening continuously increases until the output power of the overhead contact line 1 is less than the vehicle's input power. At this point, the vehicle's driving mode switches to hybrid drive mode. While the overhead contact line 1 and the pantograph system 2 remain running, the energy storage device 8 is activated to supply electrical energy to the traction motor 5, so that the traction motor 5 can receive enough electrical energy to maintain the vehicle's acceleration.

[0096] Step s401: When the total output power of the contact wire 1 and the energy storage device 8 is less than the input power of the vehicle, start the generator 3 to supply electrical energy to the traction motor 5.

[0097] Specifically, during vehicle acceleration, the throttle opening continuously increases until the total output power of the contact wire 1 and the energy storage device 8 is less than the vehicle's input power. At this time, while the contact wire 1, pantograph system 2 and energy storage device 8 remain open, the generator 3 is activated to supply electrical energy to the traction motor 5 so that the traction motor 5 can receive enough electrical energy to maintain the vehicle's acceleration.

[0098] When the total output power of the overhead contact line 1 and the energy storage device 8 is less than the input power of the vehicle, starting the generator 3 to supply electrical energy to the traction motor 5 also includes:

[0099] Step s4011: Start the first power generation unit 31, the second power generation unit 32 and the third power generation unit 33 in sequence until the total output power of the contact wire 1, the energy storage device 8 and the power generation unit 3 is greater than or equal to the input power of the vehicle.

[0100] Specifically, during vehicle acceleration, the throttle opening continuously increases. When the actual power demand of the traction motor 5 exceeds the total output power of the contact wire 1 and the energy storage device 8, the first power generation unit 31 is activated; when the actual power demand of the traction motor 5 exceeds the total output power of the contact wire 1, the energy storage device 8, and the first power generation unit 31, the second power generation unit 32 is activated; and when the actual power demand of the traction motor 5 exceeds the total output power of the contact wire 1, the energy storage device 8, the first power generation unit 31, and the second power generation unit 32, the third power generation unit 33 is activated.

[0101] The technical solution provided in the embodiments of the present invention enables the vehicle to switch different driving modes according to its driving speed and the weight of the ore by sequentially activating the contact network 1, energy storage device 8, first power generation unit 31, second power generation unit 32 and third power generation unit 33, thereby reducing energy consumption, improving the fuel efficiency of the vehicle, reducing the vehicle operating cost and improving economic benefits.

[0102] See also Figure 3 As shown, in a fourth aspect of this application, a braking energy recovery method is provided for recovering the braking energy of the aforementioned vehicle.

[0103] Braking energy recovery methods include:

[0104] Step s501: During vehicle braking, traction motor 5 supplies electrical energy to energy storage device 8.

[0105] When the vehicle brakes suddenly, the drive unit stops immediately, but the wheels cannot stop rotating immediately and will continue to move forward a certain distance. At this time, the rotation of the wheels drives the drive wheel axle to rotate, so that the traction motor 5 generates electrical energy.

[0106] Specifically, when the vehicle brakes in an emergency, the electrical energy generated by the two traction motors 5 during braking is transmitted to the energy storage device 8. The energy storage device 8 stores the braking energy, which can be used to drive the vehicle during braking and thus realize the recovery and utilization of braking energy.

[0107] Step s601: When the braking energy is greater than the rated capacity of the energy storage device 8, the traction motor 5 supplies electrical energy to the contact network 1.

[0108] Specifically, when the vehicle brakes frequently, the braking energy generated by the traction motor 5 is relatively large. When the braking energy exceeds the rated capacity of the energy storage device 8, the excess electricity is returned to the contact network 1 by the pantograph system 2 for energy storage, and then used in the vehicle driving condition to drive the vehicle, so as to realize the recovery and utilization of braking energy.

[0109] Braking energy recovery methods also include:

[0110] Step s701: When the braking energy is greater than the total rated capacity of the energy storage device 8 and the contact wire 1, the traction motor 5 supplies electrical energy to the braking resistor 6.

[0111] Specifically, when the vehicle brakes frequently, the braking energy generated by the traction motor 5 is relatively large. When the braking energy exceeds the total rated capacity of the energy storage device 8 and the contact wire 1, the excess electricity is consumed by the heat generated by the two braking resistors 6. This prevents the electricity in the energy storage device 8 and the contact wire 1 from exceeding the rated capacity and causing damage, thus extending the service life of the contact wire 1 and the energy storage device 8, and improving the stability of the vehicle operation.

[0112] The technical solution provided in the embodiments of the present invention enables the energy storage device 8 to recover braking energy under braking conditions, and the contact wire 1 to continue to recover braking energy when the electrical charge in the energy storage device 8 reaches its rated capacity. This enables the mining industry to recover and utilize braking energy in various ways during emergency braking, reducing energy loss, lowering vehicle operating costs, and improving economic efficiency.

[0113] The embodiments of the present invention provide a multi-source power system, a driving method, a braking energy recovery method, and a vehicle. The multi-source power system connects the output terminal of the traction motor 5 to the input terminals of the energy storage device 8 and the overhead contact line 1, respectively, so that the traction motor 5 can supply electrical energy to the energy storage device 8 and the overhead contact line 1 during vehicle braking. In the prior art, the electrical energy generated by the traction motor 5 during vehicle braking cannot be recovered and can only be consumed by the heat generated by the braking resistor 6. Since vehicles brake frequently during operation, the total braking energy is large. Consuming it through the braking resistor 6 wastes a significant amount of energy and increases vehicle operating costs. Compared with the prior art, in this application, the energy storage device 8 can recover braking energy under a first operating condition, and the overhead contact line 1 can recover braking energy under a second operating condition. This enables the multi-source power system to recover and utilize braking energy during vehicle braking, reducing energy loss, improving fuel efficiency, lowering vehicle operating costs, and increasing economic benefits. Furthermore, the multi-source power system in this application has a high degree of integration, which is conducive to its widespread use. The vehicle driving method involves sequentially activating the overhead contact line 1, energy storage device 8, first power generation unit 31, second power generation unit 32, and third power generation unit 33. This allows the vehicle to switch between different driving modes based on its speed and the weight of the ore, reducing energy consumption, improving fuel efficiency, and lowering operating costs. The vehicle braking energy recovery method allows the energy storage device 8 to recover braking energy during braking, and the overhead contact line 1 to continue recovering braking energy when the energy storage device 8 reaches its rated capacity. This enables multiple types of braking energy recovery and utilization during emergency braking in mining operations, further reducing energy consumption, lowering operating costs, and improving economic efficiency. It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0114] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A multi-source power system, characterized in that, The system includes a contact wire (1), an energy storage device (8), and a traction motor (5). The contact wire (1) and the energy storage device (8) are connected in parallel. The output ends of the contact wire (1) and the energy storage device (8) are respectively connected to the input end of the traction motor (5) to drive the traction motor (5). The output end of the traction motor (5) is respectively connected to the input end of the energy storage device (8) and the input end of the contact wire (1). The energy storage device (8) is used to recover braking energy under a first operating condition, and the contact wire (1) is used to recover the braking energy under a second operating condition. The first operating condition is when the vehicle is in a braking state and the current charge of the energy storage device (8) is lower than its rated capacity. The second operating condition is when the vehicle is in a braking state and the current charge of the energy storage device (8) has reached its rated capacity. The multi-source power system also includes a generator (3), which is connected in parallel with the contact wire (1). The output end of the contact wire (1) is connected to the input end of the traction motor (5) through the pantograph system (2), and the output end of the generator (3) is connected to the input end of the traction motor (5) through the traction converter (4). The power generation unit (3) includes a first power generation unit (31), a second power generation unit (32), and a third power generation unit (33), which are arranged in parallel. When the input power of the traction motor (5) is greater than the first threshold, the first power generation unit (31) is started; When the input power of the traction motor (5) is greater than the second threshold, the second power generation unit (32) is started; When the input power of the traction motor (5) is greater than the third threshold, the third power generation unit (33) is started.

2. The multi-source power system according to claim 1, characterized in that, The multi-source power system also includes a braking resistor (6), the input end of which is connected to the output end of the traction motor (5), and the braking resistor (6) is used to recover the braking energy in the third working condition; The third working condition is when the vehicle is in a braking state and the braking energy generated by the vehicle is greater than the sum of the rated capacities of the energy storage device (8) and the contact wire (1).

3. The multi-source power system according to claim 2, characterized in that, The multi-source power system also includes a cooling unit (7), the input end of which is connected to the output end of the traction motor (5). The cooling unit (7) includes a first cooling unit (71), a second cooling unit (72), and a third cooling unit (73). The first cooling unit (71) and the second cooling unit (72) are used to cool the braking resistor (6), and the third cooling unit (73) is used to cool the traction motor (5).

4. A vehicle, characterized in that, Including the multi-source power system as described in claim 2 or 3.

5. A driving method, characterized in that, For driving the vehicle of claim 4, the vehicle further includes a controller for controlling the operation of the energy storage device (8) and the power generation unit (3) according to the throttle opening, the method comprising: The overhead contact line (1) and the pantograph system (2) are activated to supply electrical energy to the traction motor (5); The controller compares the output power of the overhead contact line (1) with the input power of the vehicle; When the output power of the overhead contact line (1) is less than the input power of the vehicle, the energy storage device (8) is activated to supply electrical energy to the traction motor (5).

6. The driving method according to claim 5, characterized in that, The method further includes: When the total output power of the overhead contact line (1) and the energy storage device (8) is less than the input power of the vehicle, the generator (3) is activated to supply electrical energy to the traction motor (5).

7. The driving method according to claim 6, characterized in that, When the total output power of the overhead contact line (1) and the energy storage device (8) is less than the input power of the vehicle, starting the generator (3) to supply electrical energy to the traction motor (5) further includes: The first power generation unit (31), the second power generation unit (32), and the third power generation unit (33) are started in sequence until the total output power of the contact network (1), the energy storage device (8), and the power generation unit (3) is greater than or equal to the input power of the vehicle.

8. A method for recovering braking energy, characterized in that, The method for recovering braking energy of the vehicle of claim 4 includes: During the vehicle braking process, the traction motor (5) supplies electrical energy to the energy storage device (8); When the braking energy is greater than the rated capacity of the energy storage device (8), the traction motor (5) supplies electrical energy to the contact network (1).

9. The braking energy recovery method according to claim 8, characterized in that, The method further includes: When the braking energy is greater than the total rated capacity of the energy storage device (8) and the contact wire (1), the traction motor (5) supplies electrical energy to the braking resistor (6).

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