Automatic energy distribution control method for internal electric hybrid motor train unit

Abstract

The invention provides an automatic energy distribution control method for an internal electric hybrid motor train unit. The method comprises the following steps: connecting a rectification output end of a generator set network with a variable current output end of a power battery network in parallel; electric signals of the parallel output end are collected and fed back to the excitation system in the generator set network and the DC-DC converter system in the power battery network; sending a first voltage upper limit value to the excitation system according to the locomotive traction level handle position, sending a second voltage upper limit value to the converter system, and configuring the first voltage upper limit value to be greater than the second voltage upper limit value so that when the voltage of the parallel output end is less than or equal to the second voltage upper limit value, the power battery network is used as a main power supply network; and when the voltage of the parallel output end is larger than the second voltage upper limit value and smaller than or equal to the first voltage upper limit value, the generator set network serves as a main power supply network and charges the power battery network. The output power of the generator set network and the power battery network can be automatically distributed according to the traction level handle position.

Description

Technical Field

[0001] The invention relates to the field of locomotive power supply systems, and in particular to an automatic energy distribution control method for an internal electric hybrid train set. Background Art

[0002] With the increasing attention paid to environmental protection and energy conservation and emission reduction around the world, hybrid technology has been rapidly promoted and applied. Rail transit equipment is also developing in the direction of greening and intelligence to provide a safer, more comfortable and efficient travel experience. At the same time, with the continuous progress and breakthroughs in related fields such as battery technology and motor technology, a power-concentrated EMU with internal combustion engine plus power battery hybrid technology has come into being. The hybrid EMU combines the high-rate discharge characteristics of the power battery, and can flexibly adjust the power output according to driving conditions to ensure that the engine operates in the optimal working state, thereby significantly reducing fuel consumption and reducing exhaust emissions. During deceleration or braking, the hybrid EMU can recover part of the braking energy and store it in the battery, improving energy utilization efficiency. By optimizing power distribution and energy management, the hybrid EMU can significantly reduce fuel consumption, thereby reducing the long-term use cost of users.

[0003] However, in the traditional technical solution, the hybrid power energy control method is to manually control a fixed output power value and allocate the proportional relationship of the hybrid power output power, which is a relatively complicated process. Summary of the invention

[0004] In order to realize automatic distribution of power output of hybrid power, the present invention proposes an automatic energy distribution control method for an internal electric hybrid train, the method comprising: connecting the rectifier output end of the generator set network in parallel with the converter output end of the power battery network; collecting the electrical signal of the parallel output end and feeding it back to the excitation system in the generator set network and the DC-DC converter system in the power battery network respectively; sending a first voltage upper limit value to the excitation system according to the locomotive traction level, and sending a second voltage upper limit value to the converter system, and configuring the first voltage upper limit value to be greater than the second voltage upper limit value so that when the voltage of the parallel output end is less than or equal to the second voltage upper limit value, the power battery network serves as the main power supply network, and when the voltage of the parallel output end is greater than the second voltage upper limit value and less than or equal to the first voltage upper limit value, the generator set network serves as the main power supply network and charges the power battery network.

[0005] In one or more embodiments, the automatic energy distribution control method for an internal electric hybrid vehicle of the present invention further includes: when the voltage at the parallel output terminal is less than the first voltage upper limit value, feedback regulating the excitation system to increase the excitation frequency and / or excitation current to increase the output voltage and output power of the generator network.

[0006] In one or more embodiments, the automatic energy distribution control method of the internal electric hybrid vehicle group of the present invention also includes: calculating the maximum output power of the diesel engine in real time according to the calibrated power loading rate of the diesel engine in the generator set network and the load capacity of the diesel engine at different speeds and different power ranges; sending a first power upper limit value to the excitation system according to the maximum output power of the diesel engine; in response to the output voltage of the generator set network not reaching the first voltage upper limit value, while the output power reaches the first power upper limit value, controlling to stop feedback adjustment of the excitation system.

[0007] In one or more embodiments, sending a first power upper limit value to the excitation system according to the maximum output power includes: determining the first power upper limit value at 80% to 90% of the maximum output power of the diesel engine, and sending the first power upper limit value to the excitation system.

[0008] In one or more embodiments, the automatic energy distribution control method for an internal electric hybrid train of the present invention further includes: in response to the locomotive load being less than or equal to the first power upper limit value, the excitation system is not limited by the first power upper limit value, and feedback regulates the excitation system to increase the excitation frequency and / or excitation current to increase the output voltage of the generator set network to the first voltage upper limit.

[0009] In one or more embodiments, the automatic energy distribution control method of the internal electric hybrid train of the present invention also includes: in response to the locomotive load being greater than the first power upper limit value and lowering the voltage of the parallel output terminal to less than the second voltage upper limit value, feedback adjusting the switching frequency of the DC-DC converter system to increase the output voltage and output power of the power battery network.

[0010] In one or more embodiments, the automatic energy distribution control method for an internal electric hybrid vehicle of the present invention further includes: calculating the maximum output power of the power battery network in real time according to the load capacity of the power battery network, the remaining power of the power battery, and the temperature status; sending a second power upper limit value to the DC-DC conversion system according to the maximum output power of the power battery network; and controlling to stop feedback adjustment of the DC-DC conversion system in response to the output voltage of the power battery network not reaching the second voltage upper limit value while the output power reaches the second power upper limit value.

[0011] In one embodiment, the automatic energy distribution control method for an internal electric hybrid vehicle of the present invention further includes: in response to the output power of the power battery network not reaching the second power upper limit value, increasing the voltage of the parallel output terminal to the second voltage upper limit value.

[0012] In one or more embodiments, the locomotive load includes: locomotive traction power and locomotive auxiliary power.

[0013] In one or more embodiments, the automatic energy distribution control method of the internal electric hybrid electric vehicle group of the present invention further includes: when the locomotive traction level is at the full level, the power battery network and the generator set network jointly output power.

[0014] The beneficial effects of the present invention include: the technical solution of the present invention can realize automatic adjustment of the power battery input and output power according to the locomotive load power. When the power battery is fully charged, the locomotive can meet the needs of rapid loading and traction, and the diesel engine can be operated in a lower load rate range and a more economical fuel consumption rate working point, thereby improving energy utilization efficiency and achieving locomotive energy saving and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the topological structure of a hybrid power output network according to an embodiment of the present invention; Figure 2 A flowchart of an automatic energy distribution control method for an internal electric hybrid electric vehicle group according to an embodiment of the present invention; Figure 3 Schematic diagram of a power curve of hybrid power output according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0018] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0019] In order to realize automatic distribution of hybrid power output, the present invention proposes binding the upper voltage limit of the hybrid power output to the locomotive traction level handle position, so that under any locomotive traction level handle position, the hybrid power output can automatically distribute power output based on the high and low hybrid power output voltage and the upper limit value, thereby greatly simplifying the control process of the hybrid power output.

[0020] In order to more clearly explain the technical solution of the present invention, please refer to Figure 1 , which shows the topology of the hybrid output network on which the control method of the present invention is based. Figure 1 As shown, the DC power output of the diesel generator set after rectification by the rectifier is connected in parallel with the DC power output of the power battery after DC-DC conversion, and ammeters are respectively set in the diesel generator set network and the power battery network, and a potentiometer is set at the common output end of the two, which are used to detect electrical signals to achieve feedback regulation of the excitation system and DC-DC conversion system of the diesel generator set (the feedback loop is not shown).

[0021] Based on the above topological structure, the present invention proposes an automatic energy distribution control method for an internal electric hybrid train set. Figure 2 , the method comprises: step S1, connecting the rectifier output end of the generator network in parallel with the converter output end of the power battery network; Specifically, in this step, the generator network refers to a power grid including a diesel generator set, an excitation system and a rectifier, and the power battery network refers to a power grid including a power battery and a DC-DC converter system.

[0022] Step S2, collecting the electrical signals of the parallel output terminals and feeding them back to the excitation system in the generator network and the DC-DC converter system in the power battery network respectively; Specifically, the purpose of this step is to establish a feedback control loop. According to the different thresholds configured for the corresponding excitation system or DC-DC conversion system, voltage feedback control and power feedback control (hereinafter referred to as voltage loop and power loop) can be realized on each feedback control loop.

[0023] Step S3, sending a first voltage upper limit value to the excitation system and a second voltage upper limit value to the converter system according to the locomotive traction level handle position, and configuring the first voltage upper limit value to be greater than the second voltage upper limit value so that when the voltage at the parallel output end is less than or equal to the second voltage upper limit value, the power battery network serves as the main power supply network, and when the voltage at the parallel output end is greater than the second voltage upper limit value and less than or equal to the first voltage upper limit value, the generator set network serves as the main power supply network and charges the power battery network.

[0024] Specifically, this embodiment utilizes the characteristics of the power battery that can be used as both a power supply and a charging load, so that the power battery can automatically adjust the charging and discharging state according to the output of the generator network (i.e., the output of the common terminal), thereby achieving self-regulation. The purpose of configuring the first voltage upper limit value to be greater than the second voltage upper limit value is that the present invention will preferentially use the output power of the generator network for power supply, and only when the power generation power is insufficient will the power battery be selected to join the power supply.

[0025] In one embodiment, when the voltage at the parallel output terminal is less than a first voltage upper limit value, the feedback regulation excitation system increases the excitation frequency and / or the excitation current to increase the output voltage and output power of the generator set network.

[0026] In one embodiment, in order to protect the safety of the generator set under different traction pole positions, the method of the present invention also includes: calculating the maximum output power of the diesel engine in real time according to the calibrated power loading rate of the diesel engine in the generator set network and the load capacity of the diesel engine at different speeds and power ranges; sending a first power upper limit value to the excitation system according to the maximum output power of the diesel engine; in response to the output voltage of the generator set network not reaching the first voltage upper limit value, while the output power reaches the first power upper limit value, controlling to stop feedback adjustment of the excitation system.

[0027] Specifically, the locomotive traction level handle is used to control the increase or decrease of the locomotive's traction force. When the locomotive's traction force increases, the traction load will increase, which will in turn lower the voltage at the common output terminal and change the first voltage upper limit value of the excitation system, thereby causing the excitation system to adjust the output voltage and output power of the generator network.

[0028] In an optional embodiment, in order to further protect the safety of the generator set operation, a first power upper limit value is sent to the excitation system according to the maximum output power, including: determining the first power upper limit value at 80%~90% of the maximum output power of the diesel engine, and sending the first power upper limit value to the excitation system to avoid the diesel generator set operating at the maximum output power. For details, see Figure 3 The technical solution of the present invention can realize automatic adjustment of the input and output power of the power battery according to the load power of the locomotive. When the power battery is sufficiently charged, the locomotive can quickly load and traction requirements by controlling the first voltage upper limit value and the first power upper limit value, so that the diesel engine can operate in a lower load rate range and a more economical fuel consumption rate working point, thereby improving energy utilization efficiency and achieving locomotive energy saving and emission reduction.

[0029] In some embodiments, when the locomotive traction level handle position changes, the following series of feedback adjustments will also be caused: In one embodiment, in response to the locomotive load being less than or equal to the first power upper limit value, the excitation system is not limited by the first power upper limit value, and the feedback regulation excitation system increases the excitation frequency and / or the excitation current to increase the output voltage of the generator network to the first voltage upper limit value. Specifically, the load power of the locomotive is mainly composed of two parts, namely, the locomotive traction power TR + the locomotive auxiliary power AUX. At any locomotive traction level, if the locomotive load is less than or equal to the first power upper limit value, the generator network is mainly controlled by the voltage loop feedback, and is not limited by the power loop.

[0030] Correspondingly, in one embodiment, in response to the locomotive load being greater than the first power upper limit value and the voltage of the parallel output terminal being lowered to less than the second voltage upper limit value, the switching frequency of the DC-DC converter system is feedback-regulated to increase the output voltage and output power of the power battery network; in response to the output voltage of the power battery network being greater than the output voltage of the generator network, the power battery network and the generator network jointly output power. Specifically, when at any locomotive traction level, if the locomotive load is greater than the first power upper limit value, it indicates that the generator network is sufficient to provide the load, and at this time the load will lower the output voltage of the diesel generator set, so that the power battery network joins the output power supply, and at this time the diesel generator set will be limited in its power output by the power ring, and the specific restrictions include not allowing the diesel engine speed to continue to increase or increase the excitation.

[0031] In one embodiment, the maximum output power of the power battery network is calculated in real time based on the load capacity of the power battery network, the remaining power of the power batteries, and the temperature status; a second power upper limit value is sent to the DC-DC conversion system based on the maximum output power of the power battery network; in response to the output voltage of the power battery network not reaching the second voltage upper limit value, while the output power reaches the second power upper limit value, feedback regulation of the DC-DC conversion system is controlled to stop.

[0032] Specifically, when the load pulls the voltage of the common output down to the second voltage upper limit or lower, the power battery network will participate in the output power. After that, after feedback adjustment, if the sum of the output power of the power battery network and the output power of the generator network can meet the load demand and the voltage of the common output terminal has not reached the second voltage upper limit, the power battery network will be limited by the power loop to prevent its output current from being too large.

[0033] In one embodiment, the method of the present invention further includes: in response to the output power of the power battery network not reaching the second power upper limit value, increasing the voltage of the parallel output terminal to the second voltage upper limit value.

[0034] Specifically, when the locomotive load is greater than the first power upper limit value, there are two adjustment results of the DC-DC converter system. One is as in the aforementioned embodiment, in the process of increasing the output power of the power battery network, the power ring is first reached, and then it is limited by the second power upper limit; the other is as in the present embodiment, the output voltage of the power battery network is first limited by the voltage ring, and at this time the voltage of the parallel output end will be increased to the second voltage upper limit.

[0035] In one embodiment, the method of the present invention further comprises: when the locomotive traction level is at a full level, the power battery network and the generator set network jointly output power.

[0036] Specifically, when the locomotive traction level is at the full level, the method for making the power battery network and the generator set network output power together is: sending a first voltage upper limit value to the excitation system in the generator set network, and sending a second voltage upper limit value to the power conversion system of the power battery network, and making the first voltage upper limit value equal to the second voltage upper limit value.

[0037] The above are exemplary embodiments disclosed in the present invention, but it should be noted that various changes and modifications may be made without departing from the scope of the embodiments disclosed in the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order.

[0038] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the above embodiments of the present invention, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A method for controlling automatic energy distribution of an internal electric hybrid vehicle, characterized in that: The method comprises: Connect the rectifier output end of the generator network in parallel with the converter output end of the power battery network; Collecting electrical signals from the parallel output terminals and feeding them back to the excitation system in the generator network and the DC-DC converter system in the power battery network respectively; According to the locomotive traction level handle, a first voltage upper limit value is sent to the excitation system, and a second voltage upper limit value is sent to the converter system, and the first voltage upper limit value is configured to be greater than the second voltage upper limit value so that when the voltage at the parallel output end is less than or equal to the second voltage upper limit value, the power battery network serves as the main power supply network, and when the voltage at the parallel output end is greater than the second voltage upper limit value and less than or equal to the first voltage upper limit value, the generator set network serves as the main power supply network and charges the power battery network.

2. The automatic energy distribution control method for an internal electric hybrid vehicle group according to claim 1, characterized in that: The method further comprises: When the voltage at the parallel output terminal is less than the first voltage upper limit value, the excitation system is feedback-regulated to increase the excitation frequency and / or the excitation current to increase the output voltage and output power of the generator network.

3. The method for controlling automatic energy distribution of an internal-electric hybrid vehicle group according to claim 2, characterized in that: The method further comprises: Calculate the maximum output power of the diesel engine in real time according to the rated power loading rate of the diesel engine in the generator network and the load capacity of the diesel engine at different speeds and different power ranges; Sending a first power upper limit value to the excitation system according to the maximum output power of the diesel engine; In response to the output voltage of the generator network not reaching the first voltage upper limit value and the output power reaching the first power upper limit value, control stops feedback regulation of the excitation system.

4. The method for controlling automatic energy distribution of an internal-electric hybrid electric vehicle group according to claim 3, characterized in that: Sending a first power upper limit value to the excitation system according to the maximum output power includes: The first power upper limit value is determined by 80% to 90% of the maximum output power of the diesel engine, and the first power upper limit value is sent to the excitation system.

5. The automatic energy distribution control method for an internal electric hybrid vehicle group according to claim 3 is characterized in that: The method further comprises: In response to the locomotive load being less than or equal to the first power upper limit, the excitation system is not limited by the first power upper limit, and feedback regulates the excitation system to increase the excitation frequency and / or excitation current to increase the output voltage of the generator network to the first voltage upper limit.

6. The method for controlling automatic energy distribution of an internal-electric hybrid electric vehicle group according to claim 3, characterized in that: The method further comprises: In response to the locomotive load being greater than the first power upper limit and the voltage of the parallel output terminal being lowered to less than the second voltage upper limit, the switching frequency of the DC-DC converter system is feedback-regulated to increase the output voltage and output power of the power battery network.

7. The method for controlling automatic energy distribution of an internal-electric hybrid electric vehicle group according to claim 6, characterized in that: The method further comprises: Calculate the maximum output power of the power battery network in real time according to the load capacity of the power battery network, the remaining power of the power battery and the temperature status; Sending a second power upper limit value to the DC-DC converter system according to the maximum output power of the power battery network; In response to the output voltage of the power battery network not reaching the second voltage upper limit value, while the output power reaches the second power upper limit value, control is performed to stop feedback regulation of the DC-DC converter system.

8. The method for controlling automatic energy distribution of an internal-electric hybrid electric vehicle group according to claim 7, characterized in that: The method further comprises: In response to the output power of the power battery network not reaching the second power upper limit value, the voltage of the parallel output terminal is increased to the second voltage upper limit value.

9. The method for controlling automatic energy distribution of an internal-electric hybrid electric vehicle group according to any one of claims 5 to 8, characterized in that: The locomotive load includes: locomotive traction power and locomotive auxiliary power.

10. The automatic energy distribution control method for an internal electric hybrid electric vehicle group according to claim 1, characterized in that: The method further comprises: When the locomotive traction level is at the full level, the power battery network and the generator set network jointly output power.

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