A control device for energy conversion of a hybrid locomotive, a locomotive and a control method

Abstract

The application discloses a kind of hybrid locomotive energy conversion control device, locomotive and control method, including microcomputer control system, power battery system, main excitation system, DCDC control system, traction current control system;The output of power battery system is connected with DCDC control system;The input end of main excitation system is connected with the diesel engine of locomotive;The output of DCDC control system and main excitation system is parallelly connected, and is connected traction current control system through bus;Microcomputer control system controls the power output proportion of two systems by adjusting the difference between DCDC control target preset voltage value V dc and main excitation system control target preset voltage value V ch The control device of the application can make diesel engine energy output and power battery energy output conversion power linear variation, smooth transition;Avoid the problem that locomotive shakes, emits black smoke and the like caused by power instability.

Description

Technical Field

[0001] This invention relates to the field of hybrid locomotives, and more specifically to a control device, locomotive, and control method for energy conversion in hybrid locomotives. Background Technology

[0002] In the energy conversion process of hybrid locomotives, the DC-DC control system, as the core conversion component, directly affects whether the locomotive can smoothly transition from one energy source to another without abrupt changes. Existing DC-DC control systems in hybrid locomotives use voltage line control. The DC-DC control system controls the first voltage line; when the bus voltage is lower than a preset value, the converter in the DC-DC control system boosts the voltage to the preset value. After the diesel engine starts, the main excitation system controls the second voltage line (which is higher than the first). When the bus voltage is higher than the preset value, the DC-DC control system initiates charging and sets a charging power limit. The DC-DC control system determines whether to maintain a charging or discharging state based on changes in the bus voltage.

[0003] The above control method results in a lack of linearity in the power supply when the main generator takes over the power battery energy output after the locomotive diesel engine starts. During the bus voltage regulation process, the main generator power will suddenly increase, the diesel engine load will suddenly increase, and the increased fuel supply will lead to incomplete combustion, causing the diesel engine to emit black smoke. In addition, the fluctuation of the main generator power will also cause the locomotive traction output to fluctuate, causing the locomotive to shake during the switching process, which will affect the driver's driving experience. Summary of the Invention

[0004] The purpose of this invention is to provide a control device and method for energy conversion in hybrid locomotives, which can make the power change linearly and smoothly during the conversion between diesel engine energy output and power battery energy output; it can also prevent problems such as locomotive vibration caused by power instability during energy conversion, and solve the problem of black smoke caused by a sudden increase in diesel engine load leading to a high diesel engine load rate.

[0005] To achieve the aforementioned objectives, this invention provides a control device for energy conversion in a hybrid locomotive, comprising a microcomputer control system, a power battery system, a main generator excitation system, a DC-DC control system, and a traction converter control system; wherein...

[0006] The output of the power battery system is connected to the DC-DC control system; the input of the main generator excitation system is connected to the locomotive's diesel engine; the outputs of the DC-DC control system and the main generator excitation system are connected in parallel and connected to the traction converter control system via a bus.

[0007] When the locomotive is performing energy conversion, the microcomputer control system adjusts the preset voltage value V of the DC-DC control target. dc With the main excitation system control target preset voltage value V ch The difference is used to control the power output ratio of the two systems.

[0008] According to the energy conversion control device for a hybrid locomotive of the present invention, preferably, when the locomotive is performing energy conversion, the microcomputer control system adjusts the DC-DC control system and the main generator excitation system using the following formula (1):

[0009] 2k(V ch -V dc )+P dt =P ct (1)

[0010] V ch The target preset voltage value for the main generator excitation system control;

[0011] V dc The target voltage value is preset for the DC-DC control system.

[0012] P dt This refers to the actual output power of the DC-DC control system.

[0013] P ct This refers to the actual output power of the diesel engine;

[0014] k is the proportionality coefficient.

[0015] According to the energy conversion control device for a hybrid locomotive of the present invention, preferably, when the locomotive is performing energy conversion, the microcomputer control system adjusts the DC-DC control system and the main generator excitation system using the following formula (2):

[0016]

[0017] According to the energy conversion control device for a hybrid locomotive of the present invention, preferably, the power of the bus is P. M =P ct +P dt .

[0018] According to the present invention, a control device for energy conversion of a hybrid locomotive is preferably provided in the DCDC control system, which includes a voltage regulation module and a power regulation module, and the main generator excitation system includes a voltage regulation module and a power regulation module.

[0019] In addition, the present invention also provides a locomotive equipped with a control device for hybrid locomotive energy conversion as described above, wherein the output end of the locomotive's diesel engine is connected to the input end of the main excitation system.

[0020] Furthermore, the present invention also provides a control method for the energy conversion of the above-mentioned locomotive, comprising the following steps:

[0021] When the main excitation system and the power battery system are used together as a power source for output:

[0022] When the locomotive needs to perform energy conversion, the microcomputer control system adjusts the target preset voltage value V controlled by the DC-DC control system. dc The target preset voltage value V controlled by the main generator excitation system ch The difference between the two energy sources changes linearly to control the power output of the two energy sources to change linearly until the converted ratio is reached.

[0023] The energy conversion control method for a locomotive according to the present invention preferably further includes the following steps:

[0024] When the power battery system is used as a standalone energy source:

[0025] The microcomputer control system sends an enable signal to the DC-DC control system, and the DC-DC control system controls the target preset voltage value V. dc Output power limit value P dc When the actual output power P of the DC-DC control system dt More than P dc Power closed-loop control is implemented.

[0026] The energy conversion control method for a locomotive according to the present invention preferably further includes the following steps:

[0027] When the power battery system is used as a standalone energy source:

[0028] The actual output voltage value V of the DCDC control system t Lower than the preset target voltage value V dc Then the traction converter control system reduces the power output, so that the output voltage of the DC-DC control system is maintained at the target preset value for power closed-loop control.

[0029] The energy conversion control method for a locomotive according to the present invention preferably further includes the following steps:

[0030] When the diesel generator is used as a standalone energy source:

[0031] The main excitation system controls the preset voltage value V. ch Target output power P of the diesel enginech The traction converter control system uses the diesel engine's output target power P ch Perform power closed-loop control.

[0032] The beneficial effects of this invention are:

[0033] This invention proposes a control device for energy conversion in a hybrid locomotive. This control device can linearly adjust the energy distribution between multiple energy sources, thereby achieving smooth performance of the locomotive during energy conversion, preventing poor driving experience for drivers and passengers due to power fluctuations, preventing incomplete fuel combustion and black smoke caused by diesel engine overload, and preventing damage to power unit components caused by sudden increase in diesel engine load during conversion. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram illustrating the working principle of a control device for energy conversion in a hybrid locomotive according to the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0037] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.

[0038] Example

[0039] This embodiment of a hybrid locomotive energy conversion control device includes a microcomputer control system, a power battery system, a main generator excitation system, a DC-DC control system, and a traction converter control system.

[0040] The output of the power battery system is connected to the DC-DC control system; the input of the main generator excitation system is connected to the locomotive's diesel engine; the outputs of the DC-DC control system and the main generator excitation system are connected in parallel and connected to the traction converter control system via a bus.

[0041] When the locomotive performs energy conversion, the microcomputer control system adjusts the preset voltage value V of the DC-DC control target. dc With the main excitation system control target preset voltage value V ch The difference is used to control the power output ratio of the two systems; among them, the microcomputer control system adjusts the DCDC control system and the main generator excitation system through the following formula (2):

[0042]

[0043] V ch The target preset voltage value for the main generator excitation system control;

[0044] V dc The target voltage value is preset for the DC-DC control system.

[0045] P dt This refers to the actual output power of the DC-DC control system.

[0046] P ct This refers to the actual output power of the diesel engine;

[0047] k is the proportionality coefficient.

[0048] Bus power P M The calculation formula is as follows:

[0049] P M =P ct +P dt

[0050] The DC-DC control system is equipped with a voltage regulation module and a power regulation module, and the main excitation system is equipped with a voltage regulation module and a power regulation module.

[0051] When the aforementioned control device for energy conversion in a hybrid locomotive is installed on the hybrid locomotive, the output end of the locomotive's diesel engine is connected to the input end of the main excitation system.

[0052] When using the aforementioned energy conversion control device to convert the locomotive's energy source, the following steps are included:

[0053] When the energy source includes the main generator excitation system and the power battery system:

[0054] The microcomputer control system adjusts the target preset voltage value V controlled by the DC-DC control system. dc The target preset voltage value V controlled by the main generator excitation system ch The difference between the two energy sources changes linearly to control the power output of the two energy sources to change linearly until the ratio after conversion is reached. The microcomputer control system adjusts the DC-DC control system and the main excitation system through the above formula (2).

[0055] When the power battery system is used as a standalone energy source:

[0056] The microcomputer control system sends an enable signal to the DC-DC control system, and the DC-DC control system controls the preset voltage value V of the target. dc Output power limit value P dc When the actual output power P of the DC-DC control system dt More than P dc Power closed-loop control is implemented.

[0057] The actual output voltage value V of the DCDC control system t Lower than the preset target voltage value V dc Then the traction converter control system reduces the power output, so that the output voltage of the DC-DC control system is maintained at the target preset value for power closed-loop control.

[0058] When a diesel generator is used as a standalone energy source:

[0059] Main generator excitation system control target preset voltage value V ch Target output power P of the diesel engine ch The traction converter control system uses the diesel engine's output target power P ch Perform power closed-loop control.

[0060] It should be noted that the components or steps in the above embodiments can be interchanged, substituted, added, or deleted. Therefore, the combinations formed by these reasonable permutations and transformations should also fall within the protection scope of this invention, and the protection scope of this invention should not be limited to the above embodiments.

[0061] The above are exemplary embodiments disclosed in this invention. The order of the disclosed embodiments is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. However, it should be noted that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the disclosed embodiments of this invention (including the claims) is limited to these examples. Various changes and modifications can be made without departing from the scope defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular.

[0062] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of the different aspects of the invention as described above exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A control device for energy conversion of a hybrid locomotive, characterized by, It comprises a microcomputer control system, a power battery system, a main excitation system, a DCDC control system and a traction converter control system, wherein, The output of the power battery system is connected with the DCDC control system, the input of the main excitation system is connected with the diesel engine of the locomotive, the outputs of the DCDC control system and the main excitation system are connected in parallel and connected with the traction converter control system through a bus, When the locomotive is in energy conversion, the microcomputer control system controls the power output proportion of the two systems by adjusting the difference between the DCDC control target preset voltage value and the main excitation system control target preset voltage value and the main excitation system control target preset voltage value difference value. When the locomotive is in energy conversion, the microcomputer control system adjusts the DCDC control system and the main excitation system through the following formula (1): preset a target voltage value for the main excitation system control; a target preset voltage value controlled by the DCDC control system; actual output power of the DCDC control system; actual output power of the diesel engine; is a proportionality factor.

2. The control device for energy conversion of a hybrid locomotive according to claim 1, wherein The power of the bus is = .

3. The control device for energy conversion of a hybrid locomotive according to claim 1, wherein The DCDC control system is provided with a voltage regulating module and a power regulating module, and the main excitation system is provided with a voltage regulating module and a power regulating module.

4. A locomotive equipped with the control device for energy conversion of a hybrid locomotive according to claim 3, characterized by The output of the diesel engine of the locomotive is connected with the input of the main excitation system.

5. A control method of energy conversion of a locomotive as claimed in claim 4, characterized in that, It comprises the following steps: When the main excitation system and the power battery system are mixed as energy source output: When the locomotive needs to convert energy, the microcomputer control system controls the power output of the two energy sources to change linearly by adjusting the target preset voltage value controlled by the DCDC control system until the converted proportion is reached. The difference between the target preset voltage value controlled by the main excitation system and the target preset voltage value controlled by the DCDC control system changes linearly, and the power output of the two energy sources changes linearly until the converted proportion is reached.

6. The control method according to claim 5, characterized by It further comprises the following steps: When the power battery system is used as energy source output: The microcomputer control system sends a DCDC control system enabling signal, and the DCDC control system controls a target preset voltage value , an output power limit value ; When the actual output power of the DCDC control system Exceed Power closed-loop control is implemented.

7. The control method according to claim 6, characterized by It further comprises the following steps: When the power battery system is used as energy source output: The DCDC control system actually outputs a voltage value Lower than the preset target voltage value If yes, the traction converter control system reduces the power output, and the output voltage of the DCDC control system is maintained at the target preset value for power closed-loop control.

8. The control method according to claim 5, characterized by, It further comprises the following steps: When the diesel engine is used as energy source output: The main excitation system control target preset voltage value , diesel engine output power target value , traction converter control system to diesel engine output target power power closed loop control.

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