A method and system for output power control of a double-source trolley line network

Abstract

This invention discloses a method, system, electronic device, and computer-readable storage medium for controlling the output power of a dual-source trolleybus network, belonging to the technical field of dual-source trolleybuses. The method includes acquiring the motor bus current and determining the vehicle state based on the motor bus current; calculating the network output current based on the vehicle state; calculating the target network output power based on the network output current; setting a power change gradient based on the current and target network output power to obtain the final network output power, and then regulating the network output power. This ensures balanced state of charge (SOC) of the entire vehicle and maximizes the energy recovery function of the motor during braking, solving the problems of "overcharging of the trolleybus battery and unstable network output voltage" in existing technologies.

Description

Technical Field

[0001] This application relates to the field of dual-source trolleybus technology, and in particular to a method and system for controlling the output power of a dual-source trolleybus network. Background Technology

[0002] The statements in this section merely refer to the background art relevant to this application and do not necessarily constitute prior art.

[0003] Dual-source trolleybuses, as a type of new energy vehicle that combines power supply from both overhead wires and batteries, offer advantages over traditional pure electric vehicles, including longer driving range and less reliance on charging stations. Accurately controlling the overhead wire output power to meet vehicle driving requirements while maintaining a balanced battery charge has become one of the key technologies in current dual-source trolleybus research.

[0004] Most publicly available methods for controlling the output power of trolleybus grids use the maximum allowable charging power of the battery as the grid's output power. This method may lead to problems such as overcharging of the battery and unstable grid output voltage. At the same time, it fails to maximize the current recovery function at the motor end, resulting in energy waste. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this application provides a dual-source trolleybus network output power control method, system, electronic device, and computer-readable storage medium. By distinguishing between the vehicle's driving and braking states and combining the vehicle's power battery SOC value with the addition of a power change gradient, the optimal network output power under the current state is obtained. This ensures the balance of the vehicle's battery charge while improving the stability of the network output voltage and maximizing the energy recovery function of the motor.

[0006] In one aspect, this application provides a method for controlling the output power of a dual-source trolleybus network;

[0007] A method for controlling the output power of a dual-source trolleybus network includes:

[0008] Obtain the motor bus current and determine the vehicle status based on the motor bus current;

[0009] Calculate the network output current based on the vehicle status; calculate the target output power of the network based on the network output current.

[0010] Based on the current output power and target output power of the wire network, a power change gradient is set to obtain the final output power of the wire network, and the output power of the wire network is adjusted.

[0011] Furthermore, if the vehicle is in driving mode, the steps for calculating the network output current are as follows:

[0012] Set a baseline battery level, obtain the current battery level, and calculate the difference between the baseline battery level and the current battery level.

[0013] Based on the difference between the baseline charge value and the current charge value of the power battery, the output current of the power grid is calculated according to the motor bus current, the allowable charging current of the power battery, and the first current coefficient.

[0014] Furthermore, the formula for calculating the output current of the wire network is as follows:

[0015]

[0016] Where I0 is the wire network output current, M A I is the motor bus current. b The allowable charging current for the power battery is given by K, which is the first current coefficient, and ΔSOC is the difference between the reference charge value and the current charge value of the power battery.

[0017] Furthermore, if the vehicle is in a braking state, the steps for calculating the network output current are as follows:

[0018] Set a baseline battery level, obtain the current battery level, and calculate the difference between the baseline battery level and the current battery level.

[0019] Based on the difference between the baseline charge value and the current charge value of the power battery, the output current of the power grid is calculated according to the motor bus current, the allowable charging current of the power battery, and the second current coefficient.

[0020] Furthermore, the formula for calculating the output current of the wire network is as follows:

[0021]

[0022] Where I0 is the wire network output current, M A I is the motor bus current. b K1 is the allowable charging current for the power battery, K1 is the second energy coefficient, and ΔSOC is the difference between the reference energy value and the current energy value of the power battery.

[0023] Furthermore, the formula for calculating the target power of the wire network is:

[0024] P a =I0*U

[0025] Where I0 is the output current of the power grid and U is the voltage of the power battery.

[0026] Furthermore, based on the difference between the current output power of the wire network and the target output power of the wire network, a power change gradient is set, and the final output power of the wire network is calculated based on the power change gradient.

[0027] The final output power of the wire network is expressed as

[0028]

[0029] Among them, P a P is the target output power of the wire network. c P1 represents the current output power of the wire network, P2 represents the requested output power increment in each cycle of the second gradient, and P3 represents the requested output power increment in each cycle of the third gradient.

[0030] Secondly, this application provides a dual-source trolleybus network output power control system;

[0031] A dual-source trolleybus network output power control system includes:

[0032] The vehicle status determination module is configured to: acquire the motor bus current and determine the vehicle status based on the motor bus current;

[0033] The target output power calculation module for the overhead line is configured to: calculate the output current of the overhead line based on the vehicle status; and calculate the target output power of the overhead line based on the output current of the overhead line.

[0034] The wire network output power regulation module is configured to: set a power change gradient based on the current output power and target output power of the wire network, obtain the final output power of the wire network, and perform wire network output power regulation.

[0035] Thirdly, this application provides an electronic device;

[0036] An electronic device includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor, wherein the computer instructions, when executed by the processor, complete the steps of the above-described dual-source trolleybus network output power control method.

[0037] Fourthly, this application provides a computer-readable storage medium;

[0038] A computer-readable storage medium for storing computer instructions, which, when executed by a processor, complete the steps of the above-described dual-source trolleybus network output power control method.

[0039] Compared with the prior art, the beneficial effects of this application are:

[0040] The dual-source trolleybus grid output power control method provided in this application distinguishes vehicle status and calculates output power based on vehicle status, solving the problems of trolleybus battery overcharging and grid output voltage instability, ensuring the overall vehicle SOC balance. At the same time, when the vehicle is in braking state, it can maximize the role of motor energy recovery, avoid energy waste and avoid overcharging of power battery. Attached Figure Description

[0041] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0042] Figure 1 This is a flowchart illustrating an embodiment of the present application. Detailed Implementation

[0043] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0045] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0046] Example 1

[0047] In the prior art, using the maximum allowable charging power of the battery as the output power of the power grid may lead to problems such as overcharging of the battery and unstable output voltage of the power grid. At the same time, it cannot maximize the function of current recovery at the motor end, resulting in energy waste. Therefore, this application provides a dual-source trolleybus power grid output power control method.

[0048] Next, combined Figure 1 This embodiment discloses a method for controlling the output power of a dual-source trolleybus network. The method includes the following steps:

[0049] S1. Obtain the motor bus current and determine the vehicle status based on the motor bus current; specifically, receive the motor bus current M via CAN message. A Then, the vehicle is in a driving or braking state based on the motor current.

[0050] In this embodiment, a positive current value is defined as motor driving, and a negative current value as motor braking; that is, if MA > 0, the vehicle is in driving mode; if M A If the value is less than 0, the vehicle is in a braking state.

[0051] S2. Calculate the output current of the power grid based on the vehicle status; if the vehicle is in driving mode, execute step S201; if the vehicle is in braking mode, execute step S202.

[0052] When the vehicle is in driving mode, the power grid supplies power to the battery and motor; when the vehicle is braking mode, both the power grid and motor supply power to the battery. If the vehicle's state is not distinguished, the vehicle will be overcharged when braking mode, resulting in a waste of power to the battery and the return flow of electricity to the motor.

[0053] S201. If the vehicle is in driving mode, calculate the output current value of the power grid based on the current battery charge.

[0054] For example, firstly, a reference battery level is set, the current battery level is obtained, the difference between the reference battery level and the current battery level is calculated, and the grid output current is determined based on the difference; the difference between the reference battery level and the current battery level is expressed as...

[0055] ΔSOC=SOC A -SOC

[0056] Among them, SOC A The base charge value is the SOC (State of Charge) value, which is the current charge value of the power battery.

[0057] The baseline capacity value is the battery capacity corresponding to the maximum charge / discharge efficiency of the power battery.

[0058] Depending on the battery's charge level, its charging capacity varies and is divided into ranges. On the one hand, the lower the battery's charge level, the greater the allowable charging capacity. On the other hand, the closer the battery is to the baseline charge level, the smaller the allowable charging capacity, thus preventing overcharging of the battery.

[0059] If ΔSOC<0, the output current I0 of the wire network is 0, and the wire network does not need to supply power to the whole vehicle.

[0060] If 0 ≤ ΔSOC < 10, then the output current I0 of the wire network is equal to the motor bus current M. A The current output from the grid in this power range is entirely used for motor drive, and there is no need to charge the battery.

[0061] If 10 ≤ ΔSOC < 20, the output current I0 of the wire network is the motor bus current M. A Plus the battery's allowable charging current I b The product of the first current coefficient K and the product of the two current coefficients is calculated as I0 = I b*K + M A , where 0 < K < 1, a part of the grid output current in this power range is used for motor drive, and a part is used to charge the power battery;

[0062] If ΔSOC ≥ 20, the grid output current I0 is the battery allowable charging current I b plus the motor bus current M a , and the calculation formula is I0 = I b + M A , and in this power range, the grid output current fully powers the battery charging and motor drive.

[0063] To sum up, the calculation formula for the grid output current in the driving state is:

[0064]

[0065] S202. If the vehicle is in the braking state, calculate the grid output current value according to the difference ΔSOC.

[0066] If ΔSOC < 0, at this time the grid output current I0 is 0, and the grid does not need to supply power to the whole vehicle, and the battery charging current completely depends on the motor recovery current for charging;

[0067] If 0 ≤ ΔSOC < 15, at this time the grid output current I0 is equal to the battery allowable charging current I b , the difference between the motor bus current M A and the absolute value is then multiplied by the second current coefficient K1, and the calculation formula is I0 = (I b - |M A |) * K1, where 0 < K1 < 1. In this power range, the battery charging amount mainly comes from the motor recovery current, and a small part comes from the grid current;

[0068] If ΔSOC ≤ 15, at this time the grid output current I0 is equal to the difference between the battery allowable charging current I b and the absolute value of the motor bus current M, and the calculation formula is I0 = I b - |M A |. In this power range, when the vehicle brakes, in addition to maximizing the motor recovery current, the grid output is also used as much as possible to charge the battery;

[0069] To sum up, the calculation formula for the grid output current in the braking state is:

[0070]

[0071] S3. Calculate the grid target output power according to the grid output current; specifically, calculate the grid target power P according to the grid output current I0 obtained in the driving or braking state a , and the calculation formula is as follows:

[0072] P a =I0*U

[0073] Where I0 is the output current of the power grid and U is the voltage of the power battery.

[0074] S4. Based on the current output power and target output power of the wire network, set the power change gradient to obtain the final output power of the wire network.

[0075] When the target power P a With the current output power P of the wire network c When the difference ΔP is too large, if the output power P is directly requested from the wire network... a This can cause fluctuations in the output power of the network, leading to instability in the overall network output voltage. Therefore, a power variation gradient is set to address the problem of network output power fluctuations.

[0076] If ΔP < 30, the output power of the wire network is P. f =P a ;

[0077] If 30 ≤ ΔP < 80, the output power of the wire network is P. f =P c +P1, meaning the requested output power increment in each cycle is P1, and the final value reaches the target power P. a ;

[0078] If ΔP≥80, the output power of the wire network is P. f =P c +P2, meaning the increment of requested output power in each cycle is P2, and the final value reaches the target power P. a .

[0079] The final output power of the wire network is expressed as

[0080]

[0081] The final output power of the network is adjusted based on the requested output power increment and the current actual output power of the network in each cycle.

[0082] In this embodiment, the dual-source trolleybus network output power control method is executed by the vehicle controller.

[0083] Example 2

[0084] This embodiment discloses a dual-source trolleybus network output power control system, including:

[0085] The vehicle status determination module is configured to: acquire the motor bus current and determine the vehicle status based on the motor bus current;

[0086] The target output power calculation module for the overhead line is configured to: calculate the output current of the overhead line based on the vehicle status; and calculate the target output power of the overhead line based on the output current of the overhead line.

[0087] The wire network output power regulation module is configured to: set a power change gradient based on the current output power and target output power of the wire network, obtain the final output power of the wire network, and perform wire network output power regulation.

[0088] It should be noted that the vehicle status judgment module, the network target output power calculation module, and the network output power control module mentioned above correspond to the steps in Embodiment 1. The examples and application scenarios implemented by these modules and their corresponding steps are the same, but they are not limited to the content disclosed in Embodiment 1. It should be noted that these modules, as part of the system, can be executed in a computer system such as a set of computer-executable instructions.

[0089] Example 3

[0090] Embodiment 3 of the present invention provides an electronic device, including a memory and a processor, as well as computer instructions stored in the memory and running on the processor. When the computer instructions are executed by the processor, they complete the above-mentioned steps.

[0091] Example 4

[0092] Embodiment 4 of the present invention provides a computer-readable storage medium for storing computer instructions, which, when executed by a processor, complete the above-described steps.

[0093] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0094] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1The function specified in one or more boxes.

[0095] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment, whereby a series of operational steps are performed to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0096] The descriptions of each embodiment in the above embodiments have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0097] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for controlling the output power of a dual-source trolley line network, characterized in that, include: Obtain the motor bus current and determine the vehicle status based on the motor bus current; Calculate the output current of the wire network based on the vehicle status; If the vehicle is in driving mode, the steps for calculating the output current of the power grid are as follows: Set a baseline energy value, obtain the current power battery energy value, and calculate the difference between the baseline energy value and the current power battery energy value; based on the difference between the baseline energy value and the current power battery energy value, calculate the grid output current according to the motor bus current, the power battery allowable charging current, and the first current coefficient; If the vehicle is braking, the steps for calculating the network output current are as follows: Set a baseline energy value, obtain the current power battery energy value, and calculate the difference between the baseline energy value and the current power battery energy value; based on the difference between the baseline energy value and the current power battery energy value, calculate the grid output current according to the motor bus current, the power battery allowable charging current, and the second current coefficient; Calculate the target output power of the wire network based on the output current of the wire network; Based on the current output power and target output power of the wire network, a power change gradient is set to obtain the final output power of the wire network, and the output power of the wire network is adjusted. Specifically, based on the difference between the current output power and the target output power of the wire network, a power change gradient is set, and the final output power of the wire network is calculated based on the power change gradient. The final output power of the wire network is expressed as in, For the target output power of the wire network, This represents the current output power of the wire network. This is the difference between the target output power of the wire network and the current output power of the wire network. The increment of the requested output power for each cycle of the second gradient. This represents the increment of the requested output power for each cycle of the third gradient.

2. The dual-source trolleybus network output power control method as described in claim 1, characterized in that, The formula for calculating the output current of the wire network under driving conditions is as follows: in, For the output current of the wire network, This is the motor bus current. K represents the allowable charging current of the power battery, and K is the first current coefficient. This is the difference between the baseline battery charge value and the current battery charge value.

3. The dual-source trolleybus network output power control method as described in claim 1, characterized in that, The formula for calculating the output current of the power grid under braking conditions is as follows: in, For the output current of the wire network, This is the motor bus current. K1 is the allowable charging current for the power battery, and K1 is the second energy coefficient. This is the difference between the baseline battery charge value and the current battery charge value.

4. The dual-source trolleybus network output power control method as described in claim 1, characterized in that, The formula for calculating the target power of the wire network is: in, For the output current of the wire network, This refers to the voltage of the power battery.

5. A dual-source trolleybus network output power control system, characterized in that, include: The vehicle status determination module is configured to: acquire the motor bus current and determine the vehicle status based on the motor bus current; The target output power calculation module for the overhead line is configured to calculate the output current of the overhead line based on the vehicle status. If the vehicle is in driving mode, the steps for calculating the output current of the power grid are as follows: Set a baseline energy value, obtain the current power battery energy value, and calculate the difference between the baseline energy value and the current power battery energy value; based on the difference between the baseline energy value and the current power battery energy value, calculate the grid output current according to the motor bus current, the power battery allowable charging current, and the first current coefficient; If the vehicle is braking, the steps for calculating the network output current are as follows: Set a baseline energy value, obtain the current power battery energy value, and calculate the difference between the baseline energy value and the current power battery energy value; based on the difference between the baseline energy value and the current power battery energy value, calculate the grid output current according to the motor bus current, the power battery allowable charging current, and the second current coefficient; Calculate the target output power of the wire network based on the output current of the wire network; The wire network output power control module is configured to: set a power change gradient based on the current output power and the target output power of the wire network to obtain the final output power of the wire network and perform wire network output power control; wherein, based on the difference between the current output power and the target output power of the wire network, a power change gradient is set, and the final output power of the wire network is calculated based on the power change gradient; The final output power of the wire network is expressed as in, For the target output power of the wire network, This represents the current output power of the wire network. This is the difference between the target output power of the wire network and the current output power of the wire network. The increment of the requested output power for each cycle of the second gradient. This represents the increment of the requested output power for each cycle of the third gradient.

6. An electronic device, characterized in that, It includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor, which, when executed by the processor, perform the steps described in any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, Used to store computer instructions, which, when executed by a processor, perform the steps described in any one of claims 1-4.

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