WO2023016322A1 - Parallel suspension control method for multi-branch power battery system - Google Patents

Parallel suspension control method for multi-branch power battery system Download PDF

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Publication number
WO2023016322A1
WO2023016322A1 PCT/CN2022/110161 CN2022110161W WO2023016322A1 WO 2023016322 A1 WO2023016322 A1 WO 2023016322A1 CN 2022110161 W CN2022110161 W CN 2022110161W WO 2023016322 A1 WO2023016322 A1 WO 2023016322A1
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Prior art keywords
branch
voltage
power battery
direct connection
parallel
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PCT/CN2022/110161
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French (fr)
Chinese (zh)
Inventor
李茹华
王永
杨波
马晓媛
冯坷欣
邓伯勇
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中车资阳机车有限公司
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Publication of WO2023016322A1 publication Critical patent/WO2023016322A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/64—Constructional details of batteries specially adapted for electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/22—Balancing the charge of battery modules
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present invention relates to the technical field of new energy shunting locomotives, and more specifically, relates to a control method for parallel connection and direct connection of a multi-branch power battery system.
  • the existing technology generally uses a single-branch power battery for traction power supply, and some multi-branch power battery systems use diodes in parallel. Although this method does not generate circulating currents, the balance of each branch is poor.
  • the purpose of the present invention is to overcome the deficiencies of the prior art, to provide a parallel direct-connection control method for a multi-branch power battery system, which realizes multi-branch energy division, direct connection control without impact, and no large circulation.
  • the perfect software control strategy realizes the parallel connection of each working condition.
  • a multi-branch power battery system parallel connection direct connection control method comprising the steps of: before the power battery parallel connection direct connection, comparing the power battery voltage of each branch and calculating the voltage difference of the power battery of each branch, and then based on the power battery voltage of each branch
  • Parallel direct connection control of various working conditions is carried out based on the comparison results of each branch and the calculation results of the power battery pressure difference of each branch.
  • it includes the step of: comparing the calculation result of the power battery pressure difference of each branch with the set threshold value, and performing parallel direct connection control of various working conditions according to the comparison result of the set threshold value.
  • the comparison of the voltages of the power batteries of each branch and the calculation of the voltage difference of the power batteries of each branch are realized by a microcomputer control system.
  • the parallel direct connection control of the multiple working conditions includes the parallel direct connection control of the pure electric traction working condition.
  • the parallel through-connection control of various working conditions includes the direct-connection parallel control of mixed traction working conditions.
  • the parallel direct connection control of the multiple working conditions includes the direct connection parallel control of the pure diesel charging working condition.
  • Step 1 Put the highest voltage branch into the pre-charging of the intermediate DC circuit
  • Step 2 Then put into the secondary high voltage branch again;
  • Step 3 Finally put into the lowest voltage branch
  • Step 1 Open the high-voltage branch for discharge and limit the discharge current
  • Step 2 When the pressure difference between the high-voltage branch and the sub-high-voltage branch reaches the set range, the sub-high-voltage branch is turned on for common discharge to limit the discharge current;
  • Step 3 When the voltage difference of the high-voltage branch and the sub-high-voltage branch are jointly discharged, and the pressure difference with the lowest branch reaches the set range, the lowest voltage branch is opened, and the three branches are jointly discharged.
  • the steps include:
  • the steps are the same as when the pressure difference of any branch is within the threshold in the parallel direct connection control of pure electric traction; then control according to the hybrid control strategy;
  • Step 1 Open the low-voltage branch for charging and limit the traction power
  • Step 2 When the lowest voltage branch is charged close to the sub-high voltage branch and the voltage difference between the two branches is within the set range, the sub-high voltage branch is turned on for common charging to limit the traction power;
  • Step 3 When the voltages of the two branches are charged close to the highest voltage branch, open the highest voltage branch, and discharge the three branches together.
  • Step 1 Open the low-voltage branch for charging and limit the charging power
  • Step 2 When the lowest voltage branch is charged close to the secondary high voltage branch and the voltage difference between the two branches is within the set range, the secondary high voltage branch is turned on for common charging to limit the charging power;
  • Step 3 When the voltage of the two branches is charged close to the highest voltage branch, open the highest voltage branch, and charge the three branches together;
  • the locomotive microcomputer compares the charging current limit provided by each branch management system with the charging current set by the microcomputer, and takes the minimum value to give the charger to perform constant current charging. After one of the branches reports a fault, first stop charging the charger, then disconnect the faulty branch, and continue to charge the rest of the branches; when one of the branches is charged to the first set ratio, reduce the charging current and continue charging , until all branches are charged to the first set ratio, stop charging. The road continues to charge until the first set ratio.
  • the present invention realizes multi-branch energy division, direct connection control without impact, and no large circulation.
  • the present invention provides a perfect software control strategy, and realizes the parallel connection of each working condition.
  • Fig. 1 is a schematic circuit diagram of putting the highest voltage branch into pre-charging of the intermediate DC circuit under the pure electric traction working condition in the embodiment of the present invention
  • Fig. 2 is a schematic circuit diagram of putting the highest voltage branch into pre-charging of the sub-high voltage circuit under the pure electric traction working condition in the embodiment of the present invention
  • Fig. 3 is a schematic circuit diagram of putting the highest voltage branch into pre-charging for the lowest voltage circuit under the pure electric traction working condition in the embodiment of the present invention
  • Fig. 4 is a circuit schematic diagram of opening a high-voltage branch to discharge and limiting the discharge current under the pure electric traction working condition in the embodiment of the present invention
  • Fig. 5 is a circuit schematic diagram of opening the sub-high voltage branches for common discharge and limiting the discharge current under the pure electric traction working condition in the embodiment of the present invention
  • Fig. 6 is a schematic diagram of a circuit in which the lowest voltage branch is opened and the three branches are jointly discharged under the pure electric traction working condition in the embodiment of the present invention
  • Fig. 7 is a circuit schematic diagram of opening a low-voltage branch for charging and limiting traction power under hybrid traction working conditions in an embodiment of the present invention
  • Fig. 8 is a schematic diagram of opening the sub-high voltage branch for common charging and limiting the traction power under the hybrid traction working condition in the embodiment of the present invention
  • Fig. 9 is a schematic diagram of a circuit in which the highest voltage branch is opened and the three branches are jointly discharged under the hybrid traction working condition in the embodiment of the present invention.
  • Fig. 10 is a schematic diagram of a circuit in which the low-voltage branch is opened for charging and the charging power is limited under the pure diesel charging working condition in the embodiment of the present invention
  • Fig. 11 is a schematic diagram of a circuit in which sub-high voltage branches are turned on for joint charging and charging power is limited under pure diesel charging working conditions in an embodiment of the present invention
  • Fig. 12 shows that the highest voltage branch is opened under the pure diesel charging condition in the embodiment of the present invention, and the three branches are charged together.
  • a parallel connection direct connection control method for a multi-branch power battery system includes the steps of: comparing the power battery voltage of each branch and calculating the power battery voltage difference of each branch before the power battery parallel connection direct connection , and then based on the comparison results of the power batteries of each branch and the calculation results of the pressure difference of the power batteries of each branch, the parallel direct connection control of various working conditions is carried out.
  • it includes the step of: comparing the calculation result of the power battery pressure difference of each branch with the set threshold value, and performing parallel direct connection control of various working conditions according to the comparison result of the set threshold value .
  • the comparison of the voltages of the power batteries in each branch and the calculation of the voltage difference of the power batteries in each branch are realized by a microcomputer control system.
  • the parallel direct connection control of multiple working conditions includes the parallel direct connection control of the pure electric traction working condition.
  • the parallel through-connection control of multiple working conditions includes the direct-connection parallel connection control of mixed traction working conditions.
  • the parallel direct connection control of multiple working conditions includes the direct connection parallel control of the pure diesel charging working condition.
  • Step 1 Put the highest voltage branch into the pre-charging of the intermediate DC circuit
  • Step 2 Then put into the secondary high voltage branch again;
  • Step 3 Finally put into the lowest voltage branch
  • Step 1 Open the high-voltage branch for discharge and limit the discharge current
  • Step 2 When the pressure difference between the high-voltage branch and the sub-high voltage branch reaches the set range, the sub-high voltage branch is turned on for common discharge to limit the discharge current;
  • Step 3 When the pressure difference of the high-voltage branch and the sub-high-voltage branch are jointly discharged, and the pressure difference with the lowest branch reaches the set range, the lowest voltage branch is opened, and the three branches are jointly discharged.
  • the steps include:
  • the steps are the same as when the pressure difference of any branch is within the threshold in the parallel direct connection control of pure electric traction; then control according to the hybrid control strategy;
  • Step 1 Open the low-voltage branch for charging and limit the traction power
  • Step 2 When the lowest voltage branch is charged close to the sub-high voltage branch and the voltage difference between the two branches is within the set range, the sub-high voltage branch is turned on for common charging to limit the traction power;
  • Step 3 When the voltages of the two branches are charged close to the highest voltage branch, open the highest voltage branch, and discharge the three branches together.
  • Step 1 Open the low-voltage branch for charging and limit the charging power
  • Step 2 When the lowest voltage branch is charged close to the secondary high voltage branch and the voltage difference between the two branches is within the set range, the secondary high voltage branch is turned on for common charging to limit the charging power;
  • Step 3 When the voltage of the two branches is charged close to the highest voltage branch, open the highest voltage branch, and charge the three branches together;
  • the locomotive microcomputer compares the charging current limit provided by each branch management system with the charging current set by the microcomputer, and takes the minimum value for charging.
  • the machine performs constant current charging.
  • first stop charging the charger then disconnect the faulty branch, and continue to charge the rest of the branches;
  • one of the circuits is charged to the first set ratio, Reduce the charging current and continue charging until all branches are charged to the first set ratio (such as 90%), then stop charging.
  • the highest branch reaches the second set ratio (such as 93%) then First stop the charger, and then disconnect the branch, after disconnection, the remaining branches continue to charge until the first set ratio.
  • the working principle of the embodiment of the present invention before putting into the power battery of each branch, first distinguish the branch with the highest battery voltage, the branch with the second highest battery voltage, and the branch with the lowest battery voltage by comparison, and calculate the voltage difference between the branches ;
  • the input pressure difference of the power battery is within the threshold value, the power battery voltage is input in order from high to low; when the pressure difference exceeds the threshold value, different strategies are subdivided according to different working conditions; among them, when the pressure difference exceeds the threshold value , the traction working conditions are divided into the pure electric traction working condition without the diesel engine and the hybrid traction working condition with the diesel engine running.
  • the power battery In the pure electric traction working condition where the diesel engine is not used, the power battery is connected in parallel and directly connected by turning on and discharging the power battery from the highest voltage to the lowest voltage in sequence; when the diesel engine is put into the mixed traction working condition, the power battery is used Voltage, the sub-low voltage is charged and opened in sequence.
  • the power battery When the power battery is fully activated, the power battery starts to discharge as a power source to provide power for traction; when the pressure difference exceeds the threshold value, under the pure diesel charging condition, the power battery The voltage is turned on sequentially from low to high; under pure electric traction conditions, the discharge current of the power battery is limited in the project to protect the power battery in operation; under hybrid traction conditions, the traction power is limited, and a part of the power is reserved for the input Power battery charging, when the power battery is fully charged, the power battery will be transferred to discharge; under the pure diesel charging condition, in order to ensure the safety of the power battery, the charging power is limited, and the power battery voltage is turned on sequentially from low to high.
  • the power battery adopts the method of parallel connection and direct connection; before the power battery is connected in parallel and direct connection, compare the power battery voltage of each branch, and calculate the pressure difference of the power battery of each branch; when the pressure difference is within the threshold value , the power battery is input according to the voltage of the power battery from high to low; in the pure electric traction condition (only the power battery provides the traction power source), the power battery with the highest voltage is turned on first, and the discharge current is limited to ensure the safety of the power battery.
  • the voltage difference between the highest power battery and the power battery with the second highest battery voltage is within a certain range, the sub-high voltage power battery is turned on to discharge the two batteries together.
  • the lowest voltage power battery When the voltage of the two batteries is consistent with the power battery with the lowest voltage, the lowest voltage power battery is turned on. , and finally all the batteries are turned on and discharged together.
  • mixed traction working conditions both diesel engine and power battery provide power source
  • the traction power is limited, the power battery with the lowest battery voltage is turned on first, and the generator set charges the power battery.
  • the power battery with the lowest voltage When the power battery with the lowest voltage is charged close to the sub-high voltage power battery, the traction power is limited, and the sub-high voltage power battery is turned on for common charging. Then the three branch batteries discharge together to provide power source for traction. Pure diesel charging condition (the locomotive is not towing, the diesel engine charges the power battery). Open the power battery branch with the lowest battery voltage for charging.
  • the secondary high-voltage branches are charged together to limit the charging power.
  • the highest voltage branch is opened, and the three branches are charged together.
  • the functions of the present invention are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium.
  • a computer device (which may be a personal computer, a server, or a network device, etc.) and corresponding software execute all or part of the steps of the methods described in the various embodiments of the present invention.
  • the aforementioned storage media include: various media that can store program codes such as U disks, mobile hard disks, or optical discs, and test or actual data exist in read-only memory (Random Access Memory, RAM), random access memory (RAM) and random access memory during program implementation. Access memory (Random Access Memory, RAM), etc.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
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Abstract

A Parallel suspension control method for a multi-branch power battery system, comprising the steps: comparing voltages of branch power batteries and calculating the voltage differences of the branch power batteries before the power batteries are connected in parallel and suspended, and then performing parallel suspension control of various working conditions on the basis of comparison results of the voltages of the branch power batteries and calculation results of the voltage differences of the branch power batteries. According to the present invention, multi-branch energy division is achieved, suspension control is impact-free, no large circulation is generated, a perfect software control strategy is provided, and parallel suspension of all working conditions is achieved.

Description

一种多支路动力电池系统并联直挂控制方法A parallel direct connection control method for a multi-branch power battery system 技术领域technical field
本发明涉及新能源调车机车技术领域领域，更为具体的，涉及一种多支路动力电池系统并联直挂控制方法。The present invention relates to the technical field of new energy shunting locomotives, and more specifically, relates to a control method for parallel connection and direct connection of a multi-branch power battery system.
背景技术Background technique
现有技术一般采用单一支路动力电池进行牵引供电，部分多支路动力电池系统采用二极管并联，这种方式虽然不会产生环流，但各支路均衡性较差。The existing technology generally uses a single-branch power battery for traction power supply, and some multi-branch power battery systems use diodes in parallel. Although this method does not generate circulating currents, the balance of each branch is poor.
为了实现能量分割提高动力电池系统安全性，则机车需要采用多个支路的动力电池系统。为了实现各支路均衡性，各支路动力电池宜采用并联直挂，传统的并联直挂方案易产生冲击电流损坏线路及电池，并造成安全隐患。In order to achieve energy division and improve the safety of the power battery system, the locomotive needs to use a power battery system with multiple branches. In order to achieve the balance of each branch, the power batteries of each branch should be connected in parallel. The traditional parallel connection scheme is easy to generate inrush current to damage the circuit and battery, and cause safety hazards.
发明内容Contents of the invention
本发明的目的在于克服现有技术的不足，提供一种多支路动力电池系统并联直挂控制方法，实现了多支路能量分割，直挂控制无冲击，无大的环流产生，并且提供了完善的软件控制策略，实现了各工况的并联直挂。The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a parallel direct-connection control method for a multi-branch power battery system, which realizes multi-branch energy division, direct connection control without impact, and no large circulation. The perfect software control strategy realizes the parallel connection of each working condition.
本发明的目的是通过以下方案实现的：The purpose of the present invention is achieved by the following scheme:
一种多支路动力电池系统并联直挂控制方法，包括步骤：在动力电池并联直挂前，比较各支路动力电池电压及计算各支路动力电池压差，然后基于各支路动力电池电的比较结果和各支路动力电池压差的计算结果进行多种工况的并联直挂控制。A multi-branch power battery system parallel connection direct connection control method, comprising the steps of: before the power battery parallel connection direct connection, comparing the power battery voltage of each branch and calculating the voltage difference of the power battery of each branch, and then based on the power battery voltage of each branch Parallel direct connection control of various working conditions is carried out based on the comparison results of each branch and the calculation results of the power battery pressure difference of each branch.
进一步地，包括步骤：将所述各支路动力电池压差的计算结果与设定阀值进行比较，根据设定阈值进行比较的结果进行多种工况的并联直挂控制。Further, it includes the step of: comparing the calculation result of the power battery pressure difference of each branch with the set threshold value, and performing parallel direct connection control of various working conditions according to the comparison result of the set threshold value.
进一步地，所述比较各支路动力电池电压及计算各支路动力电池压差由微机控制系统实现。Further, the comparison of the voltages of the power batteries of each branch and the calculation of the voltage difference of the power batteries of each branch are realized by a microcomputer control system.
进一步地，所述多种工况的并联直挂控制包括纯电牵引工况的并联直挂控制。Further, the parallel direct connection control of the multiple working conditions includes the parallel direct connection control of the pure electric traction working condition.
进一步地，所述多种工况的并联直挂控制包括混合牵引工况的直挂并联控制。Further, the parallel through-connection control of various working conditions includes the direct-connection parallel control of mixed traction working conditions.
进一步地，所述多种工况的并联直挂控制包括纯柴充电工况的直挂并联控制。Further, the parallel direct connection control of the multiple working conditions includes the direct connection parallel control of the pure diesel charging working condition.
进一步地，在纯电牵引工况的并联直挂控制中，包括步骤：Further, in the parallel direct connection control of the pure electric traction working condition, steps are included:
如果任意支路压差在阀值以内，则包括步骤：If any branch differential pressure is within threshold, include steps:
步骤1：先将最高电压支路投入对中间直流回路预充电；Step 1: Put the highest voltage branch into the pre-charging of the intermediate DC circuit;
步骤2：然后再一次投入次高压支路；Step 2: Then put into the secondary high voltage branch again;
步骤3：最后投入最低电压支路；Step 3: Finally put into the lowest voltage branch;
或，or,
如果任意支路压差在阀值以上，则包括步骤：If any branch pressure differential is above threshold, include steps:
步骤1：开通高压支路进行放电，限制放电电流；Step 1: Open the high-voltage branch for discharge and limit the discharge current;
步骤2：当高压支路压差与次高压支路压差达到设定范围时，开通次高压支路共同放电，限制放电电流；Step 2: When the pressure difference between the high-voltage branch and the sub-high-voltage branch reaches the set range, the sub-high-voltage branch is turned on for common discharge to limit the discharge current;
步骤3：当高压支路压差与次高压支路共同放电，与最低支路压差达到 设定范围时，开通最低电压支路，三个支路共同放电。Step 3: When the voltage difference of the high-voltage branch and the sub-high-voltage branch are jointly discharged, and the pressure difference with the lowest branch reaches the set range, the lowest voltage branch is opened, and the three branches are jointly discharged.
进一步地，在混合牵引工况的直挂并联控制中，包括步骤：Further, in the direct-mounted parallel control of mixed traction conditions, the steps include:
如果任意支路压差在阀值以内，则与纯电牵引工况的并联直挂控制中当任意支路压差在阀值以内时的步骤相同；然后根据混合控制策略控制；If the pressure difference of any branch is within the threshold, the steps are the same as when the pressure difference of any branch is within the threshold in the parallel direct connection control of pure electric traction; then control according to the hybrid control strategy;
或，or,
如果任意支路压差在阀值以上，则包括步骤：If any branch pressure differential is above threshold, include steps:
步骤1：开通低压支路进行充电，限制牵引功率；Step 1: Open the low-voltage branch for charging and limit the traction power;
步骤2：当最低电压支路充电到接近次高压支路时，两支路压差在设定范围内时，开通次高压支路共同充电，限制牵引功率；Step 2: When the lowest voltage branch is charged close to the sub-high voltage branch and the voltage difference between the two branches is within the set range, the sub-high voltage branch is turned on for common charging to limit the traction power;
步骤3：当两个支路电压充电到接近最高电压支路时，开通最高电压支路，三个支路共同放电。Step 3: When the voltages of the two branches are charged close to the highest voltage branch, open the highest voltage branch, and discharge the three branches together.
进一步地，在纯柴充电工况的直挂并联控制中，包括步骤：Further, in the direct connection parallel control of the pure diesel charging condition, steps are included:
如果任意支路压差在阀值以内，则与纯电牵引工况的并联直挂控制中当任意支路压差在阀值以内时的步骤相同；然后根据充电控制策略对三个支路同时充电；If the pressure difference of any branch is within the threshold, the steps are the same as when the pressure difference of any branch is within the threshold in the parallel direct connection control of pure electric traction; Charge;
或，or,
如果任意支路压差在阀值以上，则包括步骤：If any branch pressure differential is above threshold, include steps:
步骤1：开通低压支路进行充电，限制充电功率；Step 1: Open the low-voltage branch for charging and limit the charging power;
步骤2：当最低电压支路充电到接近次高压支路时，两支路压差在设定范围内时，开通次高压支路共同充电，限制充电功率；Step 2: When the lowest voltage branch is charged close to the secondary high voltage branch and the voltage difference between the two branches is within the set range, the secondary high voltage branch is turned on for common charging to limit the charging power;
步骤3：当两个支路电压充电到接近最高电压支路时，开通最高电压支路，三个支路共同充电；Step 3: When the voltage of the two branches is charged close to the highest voltage branch, open the highest voltage branch, and charge the three branches together;
进一步地，包括步骤：所有动力电池直挂到中间直流环节，机车微机根据各支路管理系统提供的充电电流限制和微机设置的充电电流比较，取最小值给定充电机进行恒流充电，当其中有一支路报故障后，先停止充电机充电，再断开有故障的支路，其余支路继续充电；当其中一支路充到第一设定比例后，减小充电电流，继续充电，直至所有支路充到第一设定比例后，停止充电，在此过程中，若最高支路到了第二设定比例则先停止充电机，再断开该支路，断开后其余支路继续充电直至第一设定比例。Further, it includes the steps: all power batteries are directly connected to the intermediate DC link, and the locomotive microcomputer compares the charging current limit provided by each branch management system with the charging current set by the microcomputer, and takes the minimum value to give the charger to perform constant current charging. After one of the branches reports a fault, first stop charging the charger, then disconnect the faulty branch, and continue to charge the rest of the branches; when one of the branches is charged to the first set ratio, reduce the charging current and continue charging , until all branches are charged to the first set ratio, stop charging. The road continues to charge until the first set ratio.
本发明的有益效果包括：The beneficial effects of the present invention include:
(1)本发明实现了多支路能量分割，直挂控制无冲击，无大的环流产生。(1) The present invention realizes multi-branch energy division, direct connection control without impact, and no large circulation.
(2)本发明提供了完善的软件控制策略，实现了各工况的并联直挂。(2) The present invention provides a perfect software control strategy, and realizes the parallel connection of each working condition.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.
图1为本发明实施例中纯电牵引工况下将最高电压支路投入对中间直流回路预充电的电路示意图；Fig. 1 is a schematic circuit diagram of putting the highest voltage branch into pre-charging of the intermediate DC circuit under the pure electric traction working condition in the embodiment of the present invention;
图2为本发明实施例中纯电牵引工况下将最高电压支路投入对次高压回路预充电的电路示意图；Fig. 2 is a schematic circuit diagram of putting the highest voltage branch into pre-charging of the sub-high voltage circuit under the pure electric traction working condition in the embodiment of the present invention;
图3为本发明实施例中纯电牵引工况下将最高电压支路投入对最低电压回路预充电的电路示意图；；Fig. 3 is a schematic circuit diagram of putting the highest voltage branch into pre-charging for the lowest voltage circuit under the pure electric traction working condition in the embodiment of the present invention;
图4为本发明实施例中纯电牵引工况下开通高压支路进行放电，限制放电电流的电路示意图；Fig. 4 is a circuit schematic diagram of opening a high-voltage branch to discharge and limiting the discharge current under the pure electric traction working condition in the embodiment of the present invention;
图5为本发明实施例中纯电牵引工况下开通次高压支路共同放电，限制放电电流的电路示意图；Fig. 5 is a circuit schematic diagram of opening the sub-high voltage branches for common discharge and limiting the discharge current under the pure electric traction working condition in the embodiment of the present invention;
图6为本发明实施例中纯电牵引工况下开通最低电压支路，三个支路共同放电的电路示意图；Fig. 6 is a schematic diagram of a circuit in which the lowest voltage branch is opened and the three branches are jointly discharged under the pure electric traction working condition in the embodiment of the present invention;
图7为本发明实施例中混合牵引工况下开通低压支路进行充电，限制牵引功率的电路示意图；Fig. 7 is a circuit schematic diagram of opening a low-voltage branch for charging and limiting traction power under hybrid traction working conditions in an embodiment of the present invention;
图8为本发明实施例中混合牵引工况下开通次高压支路共同充电，限制牵引功率的示意图；Fig. 8 is a schematic diagram of opening the sub-high voltage branch for common charging and limiting the traction power under the hybrid traction working condition in the embodiment of the present invention;
图9为本发明实施例中混合牵引工况下开通最高电压支路，三个支路共同放电的电路示意图；Fig. 9 is a schematic diagram of a circuit in which the highest voltage branch is opened and the three branches are jointly discharged under the hybrid traction working condition in the embodiment of the present invention;
图10为本发明实施例中纯柴充电工况下开通低压支路进行充电，限制充电功率的电路示意图；Fig. 10 is a schematic diagram of a circuit in which the low-voltage branch is opened for charging and the charging power is limited under the pure diesel charging working condition in the embodiment of the present invention;
图11为本发明实施例中纯柴充电工况下开通次高压支路共同充电，限制充电功率的电路示意图；Fig. 11 is a schematic diagram of a circuit in which sub-high voltage branches are turned on for joint charging and charging power is limited under pure diesel charging working conditions in an embodiment of the present invention;
图12为本发明实施例中纯柴充电工况下开通最高电压支路，三个支路共同充电。Fig. 12 shows that the highest voltage branch is opened under the pure diesel charging condition in the embodiment of the present invention, and the three branches are charged together.
具体实施方式Detailed ways
本说明书中所有实施例公开的所有特征，或隐含公开的所有方法或过程中的步骤，除了互相排斥的特征和/或步骤以外，均可以以任何方式组合和/或扩展、替换。All features disclosed in all embodiments in this specification, or steps in all implicitly disclosed methods or processes, except for mutually exclusive features and/or steps, can be combined and/or extended and replaced in any way.
如图1～图12所示，一种多支路动力电池系统并联直挂控制方法，包括 步骤：在动力电池并联直挂前，比较各支路动力电池电压及计算各支路动力电池压差，然后基于各支路动力电池电的比较结果和各支路动力电池压差的计算结果进行多种工况的并联直挂控制。As shown in Figures 1 to 12, a parallel connection direct connection control method for a multi-branch power battery system includes the steps of: comparing the power battery voltage of each branch and calculating the power battery voltage difference of each branch before the power battery parallel connection direct connection , and then based on the comparison results of the power batteries of each branch and the calculation results of the pressure difference of the power batteries of each branch, the parallel direct connection control of various working conditions is carried out.
在本发明可选的实施方式中，包括步骤：将各支路动力电池压差的计算结果与设定阀值进行比较，根据设定阈值进行比较的结果进行多种工况的并联直挂控制。In an optional embodiment of the present invention, it includes the step of: comparing the calculation result of the power battery pressure difference of each branch with the set threshold value, and performing parallel direct connection control of various working conditions according to the comparison result of the set threshold value .
在本发明可选的实施方式中，比较各支路动力电池电压及计算各支路动力电池压差由微机控制系统实现。In an optional embodiment of the present invention, the comparison of the voltages of the power batteries in each branch and the calculation of the voltage difference of the power batteries in each branch are realized by a microcomputer control system.
在本发明可选的实施方式中，多种工况的并联直挂控制包括纯电牵引工况的并联直挂控制。In an optional embodiment of the present invention, the parallel direct connection control of multiple working conditions includes the parallel direct connection control of the pure electric traction working condition.
在本发明可选的实施方式中，多种工况的并联直挂控制包括混合牵引工况的直挂并联控制。In an optional embodiment of the present invention, the parallel through-connection control of multiple working conditions includes the direct-connection parallel connection control of mixed traction working conditions.
在本发明可选的实施方式中，多种工况的并联直挂控制包括纯柴充电工况的直挂并联控制。In an optional embodiment of the present invention, the parallel direct connection control of multiple working conditions includes the direct connection parallel control of the pure diesel charging working condition.
在本发明可选的实施方式中，在纯电牵引工况的并联直挂控制中，包括步骤：In an optional embodiment of the present invention, in the parallel direct connection control of the pure electric traction working condition, steps are included:
如果任意支路压差在阀值以内，则包括步骤：If any branch differential pressure is within threshold, include steps:
步骤1：先将最高电压支路投入对中间直流回路预充电；Step 1: Put the highest voltage branch into the pre-charging of the intermediate DC circuit;
步骤2：然后再一次投入次高压支路；Step 2: Then put into the secondary high voltage branch again;
步骤3：最后投入最低电压支路；Step 3: Finally put into the lowest voltage branch;
或，or,
如果任意支路压差在阀值以上，则包括步骤：If any branch pressure differential is above threshold, include steps:
步骤1：开通高压支路进行放电，限制放电电流；Step 1: Open the high-voltage branch for discharge and limit the discharge current;
步骤2：当高压支路压差与次高压支路压差达到设定范围时，开通次高压支路共同放电，限制放电电流；Step 2: When the pressure difference between the high-voltage branch and the sub-high voltage branch reaches the set range, the sub-high voltage branch is turned on for common discharge to limit the discharge current;
步骤3：当高压支路压差与次高压支路共同放电，与最低支路压差达到设定范围时，开通最低电压支路，三个支路共同放电。Step 3: When the pressure difference of the high-voltage branch and the sub-high-voltage branch are jointly discharged, and the pressure difference with the lowest branch reaches the set range, the lowest voltage branch is opened, and the three branches are jointly discharged.
在本发明可选的实施方式中，在混合牵引工况的直挂并联控制中，包括步骤：In an optional embodiment of the present invention, in the direct-mounted parallel control of the mixed traction working condition, the steps include:
如果任意支路压差在阀值以内，则与纯电牵引工况的并联直挂控制中当任意支路压差在阀值以内时的步骤相同；然后根据混合控制策略控制；If the pressure difference of any branch is within the threshold, the steps are the same as when the pressure difference of any branch is within the threshold in the parallel direct connection control of pure electric traction; then control according to the hybrid control strategy;
或，or,
如果任意支路压差在阀值以上，则包括步骤：If any branch pressure differential is above threshold, include steps:
步骤1：开通低压支路进行充电，限制牵引功率；Step 1: Open the low-voltage branch for charging and limit the traction power;
步骤2：当最低电压支路充电到接近次高压支路时，两支路压差在设定范围内时，开通次高压支路共同充电，限制牵引功率；Step 2: When the lowest voltage branch is charged close to the sub-high voltage branch and the voltage difference between the two branches is within the set range, the sub-high voltage branch is turned on for common charging to limit the traction power;
步骤3：当两个支路电压充电到接近最高电压支路时，开通最高电压支路，三个支路共同放电。Step 3: When the voltages of the two branches are charged close to the highest voltage branch, open the highest voltage branch, and discharge the three branches together.
在本发明可选的实施方式中，在纯柴充电工况的直挂并联控制中，包括步骤：In an optional embodiment of the present invention, in the direct connection parallel control of the pure diesel charging condition, steps are included:
如果任意支路压差在阀值以内，则与纯电牵引工况的并联直挂控制中当任意支路压差在阀值以内时的步骤相同；然后根据充电控制策略对三个支路同时充电；If the pressure difference of any branch is within the threshold, the steps are the same as when the pressure difference of any branch is within the threshold in the parallel direct connection control of pure electric traction; Charge;
或，or,
如果任意支路压差在阀值以上，则包括步骤：If any branch pressure differential is above threshold, include steps:
步骤1：开通低压支路进行充电，限制充电功率；Step 1: Open the low-voltage branch for charging and limit the charging power;
步骤2：当最低电压支路充电到接近次高压支路时，两支路压差在设定范围内时，开通次高压支路共同充电，限制充电功率；Step 2: When the lowest voltage branch is charged close to the secondary high voltage branch and the voltage difference between the two branches is within the set range, the secondary high voltage branch is turned on for common charging to limit the charging power;
步骤3：当两个支路电压充电到接近最高电压支路时，开通最高电压支路，三个支路共同充电；Step 3: When the voltage of the two branches is charged close to the highest voltage branch, open the highest voltage branch, and charge the three branches together;
在本发明可选的实施方式中，包括步骤：所有动力电池直挂到中间直流环节，机车微机根据各支路管理系统提供的充电电流限制和微机设置的充电电流比较，取最小值给定充电机进行恒流充电，当其中有一支路报故障后，先停止充电机充电，再断开有故障的支路，其余支路继续充电；当其中一支路充到第一设定比例后，减小充电电流，继续充电，直至所有支路充到第一设定比例(例如90％)后，停止充电，在此过程中，若最高支路到了第二设定比例(例如93％)则先停止充电机，再断开该支路，断开后其余支路继续充电直至第一设定比例。In an optional embodiment of the present invention, it includes the steps: all power batteries are directly connected to the intermediate DC link, and the locomotive microcomputer compares the charging current limit provided by each branch management system with the charging current set by the microcomputer, and takes the minimum value for charging. The machine performs constant current charging. When one of the circuits reports a failure, first stop charging the charger, then disconnect the faulty branch, and continue to charge the rest of the branches; when one of the circuits is charged to the first set ratio, Reduce the charging current and continue charging until all branches are charged to the first set ratio (such as 90%), then stop charging. In the process, if the highest branch reaches the second set ratio (such as 93%) then First stop the charger, and then disconnect the branch, after disconnection, the remaining branches continue to charge until the first set ratio.
本发明实施例的工作原理：在投入各支路动力电池之前，首先通过比较区分出电池电压最高支路，电池电压次高支路，电池电压最低支路，并计算各支路间电压压差；动力电池的投入压差在阀值以内时，按照动力电池电压从高到低依次投入；当压差超过阀值时，根据不同工况细分出不同策略；其中，当压差超过阀值时，牵引工况分为柴油机未投入的纯电牵引工况与柴油机投入的混合牵引工况。柴油机未投入的纯电牵引工况，采用动力电池最高电压至最低电压依次开通放电的方式进行动力电池的并联直挂；当柴油机投入的混合牵引工况，通过限制牵引功率，采用动力电池从最低电压，次低电压依次充电开通的方式、当动力电池全部开通完毕后，动力电池作为动力源开始放电为牵引提供功率；当压差超过阀值时，在纯柴充电工况下，通过动力电池电压从低到高依次开通的方式；纯电牵引工况下，动力电池投入工程中限制放电电流，保护投入工作的动力电池；混合牵引工况下，限制牵引功率，留出一部分功率给投入的动力电池充电， 当动力电池全部投入后，动力电池转入放电；纯柴充电工况下，为保证动力电池安全，限制充电功率，通过动力电池电压从低到高依次开通。The working principle of the embodiment of the present invention: before putting into the power battery of each branch, first distinguish the branch with the highest battery voltage, the branch with the second highest battery voltage, and the branch with the lowest battery voltage by comparison, and calculate the voltage difference between the branches ; When the input pressure difference of the power battery is within the threshold value, the power battery voltage is input in order from high to low; when the pressure difference exceeds the threshold value, different strategies are subdivided according to different working conditions; among them, when the pressure difference exceeds the threshold value , the traction working conditions are divided into the pure electric traction working condition without the diesel engine and the hybrid traction working condition with the diesel engine running. In the pure electric traction working condition where the diesel engine is not used, the power battery is connected in parallel and directly connected by turning on and discharging the power battery from the highest voltage to the lowest voltage in sequence; when the diesel engine is put into the mixed traction working condition, the power battery is used Voltage, the sub-low voltage is charged and opened in sequence. When the power battery is fully activated, the power battery starts to discharge as a power source to provide power for traction; when the pressure difference exceeds the threshold value, under the pure diesel charging condition, the power battery The voltage is turned on sequentially from low to high; under pure electric traction conditions, the discharge current of the power battery is limited in the project to protect the power battery in operation; under hybrid traction conditions, the traction power is limited, and a part of the power is reserved for the input Power battery charging, when the power battery is fully charged, the power battery will be transferred to discharge; under the pure diesel charging condition, in order to ensure the safety of the power battery, the charging power is limited, and the power battery voltage is turned on sequentially from low to high.
本发明实施例的工作过程：动力电池采用并联直挂的方式；在动力电池并联直挂前，比较各支路动力电池电压，计算各支路动力电池压差；当压差在阀值以内时，动力电池投入根据动力电池电压从高至低梯级投入；在纯电牵引工况(仅动力电池提供牵引动力源)，先开通电压最高的动力电池，限制放电电流保证动力电池安全，待电池电压最高的动力电池与电池电压次高的动力电池压差在一定范围内时，开通次高压动力电池两路电池共同放电，当两路电池电压与电压最低的动力电池一致时，开通最低电压动力电池，最终各路电池全部开通后共同放电。混合牵引工况(柴油机与动力电池都提供动力源)，限制牵引功率，先开通电池电压最低的动力电池，发电机组给动力电池充电。当电压最低的动力电池充电到接近次高压动力电池时，限制牵引功率，开通次高压动力电池共同充电，当投入的两路电池电压充电接近最高压动力电池时，开通最高压支路动力电池，然后三个支路电池共同放电，为牵引提供动力源。纯柴充电工况(机车不牵引，柴油机给动力电池充电)。开通电池电压最低的动力电池支路进行充电，为保证动力电池安全，限制充电功率，当最低压支路动力电池充电到接近次高压支路时，两支路压差在一定范围内时，开通次高压支路共同充电，限制充电功率，当两个支路电压充电到接近最高电压支路时，开通最高电压支路，三个支路共同充电。The working process of the embodiment of the present invention: the power battery adopts the method of parallel connection and direct connection; before the power battery is connected in parallel and direct connection, compare the power battery voltage of each branch, and calculate the pressure difference of the power battery of each branch; when the pressure difference is within the threshold value , the power battery is input according to the voltage of the power battery from high to low; in the pure electric traction condition (only the power battery provides the traction power source), the power battery with the highest voltage is turned on first, and the discharge current is limited to ensure the safety of the power battery. When the voltage difference between the highest power battery and the power battery with the second highest battery voltage is within a certain range, the sub-high voltage power battery is turned on to discharge the two batteries together. When the voltage of the two batteries is consistent with the power battery with the lowest voltage, the lowest voltage power battery is turned on. , and finally all the batteries are turned on and discharged together. In mixed traction working conditions (both diesel engine and power battery provide power source), the traction power is limited, the power battery with the lowest battery voltage is turned on first, and the generator set charges the power battery. When the power battery with the lowest voltage is charged close to the sub-high voltage power battery, the traction power is limited, and the sub-high voltage power battery is turned on for common charging. Then the three branch batteries discharge together to provide power source for traction. Pure diesel charging condition (the locomotive is not towing, the diesel engine charges the power battery). Open the power battery branch with the lowest battery voltage for charging. In order to ensure the safety of the power battery, the charging power is limited. The secondary high-voltage branches are charged together to limit the charging power. When the voltage of the two branches is charged close to the highest voltage branch, the highest voltage branch is opened, and the three branches are charged together.
本发明未涉及部分均与现有技术相同或可采用现有技术加以实现。The parts not involved in the present invention are the same as the prior art or can be realized by adopting the prior art.
上述技术方案只是本发明的一种实施方式，对于本领域内的技术人员而言，在本发明公开了应用方法和原理的基础上，很容易做出各种类型的改进或变形，而不仅限于本发明上述具体实施方式所描述的方法，因此前面描述的方式只是优选的，而并不具有限制性的意义。The above-mentioned technical solution is only an embodiment of the present invention. For those skilled in the art, on the basis of the application methods and principles disclosed in the present invention, it is easy to make various types of improvements or deformations, and is not limited to The methods described in the above specific embodiments of the present invention, therefore, the above-described methods are only preferred and not limiting.
除以上实例以外，本领域技术人员根据上述公开内容获得启示或利用相关领域的知识或技术进行改动获得其他实施例，各个实施例的特征可以互换或替换，本领域人员所进行的改动和变化不脱离本发明的精神和范围，则都应在本发明所附权利要求的保护范围内。In addition to the above examples, those skilled in the art obtain inspiration from the above disclosure or use knowledge or technology in the relevant field to make changes to obtain other embodiments. The features of each embodiment can be interchanged or replaced. The changes and changes made by those skilled in the art If they do not depart from the spirit and scope of the present invention, they should all be within the protection scope of the appended claims of the present invention.
本发明功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，在一台计算机设备(可以是个人计算机，服务器，或者网络设备等)以及相应的软件中执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、或者光盘等各种可以存储程序代码的介质，进行测试或者实际的数据在程序实现中存在于只读存储器(Random Access Memory，RAM)、随机存取存储器(Random Access Memory，RAM)等。If the functions of the present invention are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium. A computer device (which may be a personal computer, a server, or a network device, etc.) and corresponding software execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage media include: various media that can store program codes such as U disks, mobile hard disks, or optical discs, and test or actual data exist in read-only memory (Random Access Memory, RAM), random access memory (RAM) and random access memory during program implementation. Access memory (Random Access Memory, RAM), etc.

Claims (10)

  1. 一种多支路动力电池系统并联直挂控制方法，其特征在于，包括步骤：在动力电池并联直挂前，比较各支路动力电池电压及计算各支路动力电池压差，然后基于各支路动力电池电的比较结果和各支路动力电池压差的计算结果进行多种工况的并联直挂控制。A multi-branch power battery system parallel connection direct connection control method is characterized in that it includes the steps of: before the power battery parallel connection direct connection, compare the voltage of each branch power battery and calculate the pressure difference of each branch power battery, and then based on each branch Parallel direct connection control of various working conditions is carried out based on the comparison results of the power battery voltage of each branch and the calculation results of the power battery voltage difference of each branch.
  2. 根据权利要求1所述的一种多支路动力电池系统并联直挂控制方法，其特征在于，包括步骤：将所述各支路动力电池压差的计算结果与设定阀值进行比较，根据设定阈值进行比较的结果进行多种工况的并联直挂控制。According to claim 1, a multi-branch power battery system parallel connection direct connection control method is characterized by comprising the step of: comparing the calculation result of the power battery pressure difference of each branch with the set threshold value, according to Set thresholds for comparison and perform parallel direct connection control in various working conditions.
  3. 根据权利要求1所述的一种多支路动力电池系统并联直挂控制方法，其特征在于，所述比较各支路动力电池电压及计算各支路动力电池压差由微机控制系统实现。According to claim 1, a parallel connection direct connection control method of a multi-branch power battery system, characterized in that the comparison of the voltage of each branch power battery and the calculation of the voltage difference of each branch power battery are realized by a microcomputer control system.
  4. 根据权利要求1～3任一所述的一种多支路动力电池系统并联直挂控制方法，其特征在于，所述多种工况的并联直挂控制包括纯电牵引工况的并联直挂控制。A method for parallel direct connection control of a multi-branch power battery system according to any one of claims 1 to 3, characterized in that the parallel direct connection control of multiple working conditions includes the parallel direct connection control of pure electric traction working conditions control.
  5. 根据权利要求1～3任一所述的一种多支路动力电池系统并联直挂控制方法，其特征在于，所述多种工况的并联直挂控制包括混合牵引工况的直挂并联控制。A method for parallel direct connection control of a multi-branch power battery system according to any one of claims 1 to 3, characterized in that the parallel direct connection control of multiple working conditions includes direct connection parallel control of mixed traction working conditions .
  6. 根据权利要求1～3任一所述的一种多支路动力电池系统并联直挂控制方法，其特征在于，所述多种工况的并联直挂控制包括纯柴充电工况的直挂并联控制。A method for parallel connection direct connection control of a multi-branch power battery system according to any one of claims 1 to 3, characterized in that the parallel connection direct connection control of the various working conditions includes the direct connection parallel connection of the pure diesel charging condition control.
  7. 根据权利要求4所述的一种多支路动力电池系统并联直挂控制方法，其特征在于，在纯电牵引工况的并联直挂控制中，包括步骤：According to claim 4, a method for parallel connection direct connection control of a multi-branch power battery system, characterized in that, in the parallel connection direct connection control of pure electric traction working conditions, the steps include:
    如果任意支路压差在阀值以内，则包括步骤：If any branch differential pressure is within threshold, include steps:
    步骤1：先将最高电压支路投入对中间直流回路预充电；Step 1: Put the highest voltage branch into the pre-charging of the intermediate DC circuit;
    步骤2：然后再一次投入次高压支路；Step 2: Then put into the secondary high voltage branch again;
    步骤3：最后投入最低电压支路；Step 3: Finally put into the lowest voltage branch;
    或，or,
    如果任意支路压差在阀值以上，则包括步骤：If any branch pressure differential is above threshold, include steps:
    步骤1：开通高压支路进行放电，限制放电电流；Step 1: Open the high-voltage branch for discharge and limit the discharge current;
    步骤2：当高压支路压差与次高压支路压差达到设定范围时，开通次高压支路共同放电，限制放电电流；Step 2: When the pressure difference between the high-voltage branch and the sub-high-voltage branch reaches the set range, the sub-high-voltage branch is turned on for common discharge to limit the discharge current;
    步骤3：当高压支路压差与次高压支路共同放电，与最低支路压差达到设定范围时，开通最低电压支路，三个支路共同放电。Step 3: When the pressure difference of the high-voltage branch and the sub-high-voltage branch are jointly discharged, and the pressure difference with the lowest branch reaches the set range, the lowest voltage branch is opened, and the three branches are jointly discharged.
  8. 根据权利要求5所述的一种多支路动力电池系统并联直挂控制方法，其特征在于，在混合牵引工况的直挂并联控制中，包括步骤：According to claim 5, a parallel connection direct connection control method of a multi-branch power battery system is characterized in that, in the direct connection parallel control of the mixed traction working condition, the steps include:
    如果任意支路压差在阀值以内，则与纯电牵引工况的并联直挂控制中当任意支路压差在阀值以内时的步骤相同；然后根据混合控制策略控制；If the pressure difference of any branch is within the threshold, the steps are the same as when the pressure difference of any branch is within the threshold in the parallel direct connection control of pure electric traction; then control according to the hybrid control strategy;
    或，or,
    如果任意支路压差在阀值以上，则包括步骤：If any branch pressure differential is above threshold, include steps:
    步骤1：开通低压支路进行充电，限制牵引功率；Step 1: Open the low-voltage branch for charging and limit the traction power;
    步骤2：当最低电压支路充电到接近次高压支路时，两支路压差在设定范围内时，开通次高压支路共同充电，限制牵引功率；Step 2: When the lowest voltage branch is charged close to the sub-high voltage branch and the voltage difference between the two branches is within the set range, the sub-high voltage branch is turned on for common charging to limit the traction power;
    步骤3：当两个支路电压充电到接近最高电压支路时，开通最高电压支路，三个支路共同放电。Step 3: When the voltages of the two branches are charged close to the highest voltage branch, open the highest voltage branch, and discharge the three branches together.
  9. 根据权利要求6所述的一种多支路动力电池系统并联直挂控制方法，其特征在于，在纯柴充电工况的直挂并联控制中，包括步骤：According to claim 6, a multi-branch power battery system parallel connection direct connection control method is characterized in that, in the direct connection parallel control of the pure diesel charging working condition, it comprises the steps of:
    如果任意支路压差在阀值以内，则与纯电牵引工况的并联直挂控制中当任意支路压差在阀值以内时的步骤相同；然后根据充电控制策略对三个支路同时充电；If the pressure difference of any branch is within the threshold, the steps are the same as when the pressure difference of any branch is within the threshold in the parallel direct connection control of pure electric traction; Charge;
    或，or,
    如果任意支路压差在阀值以上，则包括步骤：If any branch pressure differential is above threshold, include steps:
    步骤1：开通低压支路进行充电，限制充电功率；Step 1: Open the low-voltage branch for charging and limit the charging power;
    步骤2：当最低电压支路充电到接近次高压支路时，两支路压差在设定范围内时，开通次高压支路共同充电，限制充电功率；Step 2: When the lowest voltage branch is charged close to the secondary high voltage branch and the voltage difference between the two branches is within the set range, the secondary high voltage branch is turned on for common charging to limit the charging power;
    步骤3：当两个支路电压充电到接近最高电压支路时，开通最高电压支路，三个支路共同充电；Step 3: When the voltage of the two branches is charged close to the highest voltage branch, open the highest voltage branch, and charge the three branches together;
  10. 根据权利要求9所述的一种多支路动力电池系统并联直挂控制方法，其特征在于，包括步骤：所有动力电池直挂到中间直流环节，机车微机根据各支路管理系统提供的充电电流限制和微机设置的充电电流比较，取最小值给定充电机进行恒流充电，当其中有一支路报故障后，先停止充电机充电，再断开有故障的支路，其余支路继续充电；当其中一支路充到第一设定比例后，减小充电电流，继续充电，直至所有支路充到第一设定比例后，停止充电，在此过程中，若最高支路到了第二设定比例则先停止充电机，再断开该支路，断开后其余支路继续充电直至第一设定比例。According to claim 9, a method for parallel direct connection control of a multi-branch power battery system, characterized in that it includes the step of: all power batteries are directly connected to the intermediate DC link, and the locomotive microcomputer according to the charging current provided by each branch management system Comparing the limit with the charging current set by the microcomputer, take the minimum value to give the charger a constant current charge. When one of the branches reports a fault, stop charging the charger first, then disconnect the faulty branch, and continue to charge the rest of the branches. ; When one of the branches is charged to the first set ratio, reduce the charging current and continue charging until all branches are charged to the first set ratio, then stop charging. During this process, if the highest branch reaches the first set ratio The second setting ratio is to stop the charger first, and then disconnect the branch. After disconnection, the remaining branches continue to charge until the first setting ratio.
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