CN111055689A - Double-branch pre-charging circuit of pure electric rail locomotive and control method - Google Patents

Double-branch pre-charging circuit of pure electric rail locomotive and control method Download PDF

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Publication number
CN111055689A
CN111055689A CN202010034554.9A CN202010034554A CN111055689A CN 111055689 A CN111055689 A CN 111055689A CN 202010034554 A CN202010034554 A CN 202010034554A CN 111055689 A CN111055689 A CN 111055689A
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branch
charging
circuit
battery
contactor
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CN111055689B (en
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刘耕
李茹华
刘军
杨波
李连凯
隆孝军
陈焕章
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CRRC Ziyang Co Ltd
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CRRC Ziyang Co Ltd
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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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • 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
    • 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
    • B60L2200/00—Type of vehicles
    • B60L2200/26—Rail vehicles
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses a double-branch pre-charging circuit of a pure electric rail locomotive and a control method, belonging to the technical field of new energy rail locomotives, and comprising a middle direct-current link capacitor, an A branch and a B branch which are connected in parallel to the middle direct-current link capacitor, wherein the A branch and the B branch respectively comprise a battery branch and discharge contactors respectively connected in series with two ends of the battery branch; the device also comprises a pre-charging branch circuit, wherein the positive end of each battery branch circuit is connected to the pre-charging branch circuit through a pre-charging diode, and the other end of the pre-charging branch circuit is connected to the positive end of the intermediate direct-current link capacitor; the pre-charging branch comprises a pre-charging contactor and a pre-charging resistor, so that the purposes of ensuring the reliability and performance of the rail car, simplifying filter inductance in the circuit and meeting the requirements of the dual-branch pre-charging circuit of the pure electric rail locomotive are achieved.

Description

Double-branch pre-charging circuit of pure electric rail locomotive and control method
Technical Field
The invention belongs to the technical field of new energy rail locomotives, and particularly relates to a double-branch pre-charging circuit of a pure electric rail locomotive and a control method.
Background
With the development of battery technology, more and more pure electric vehicles replace the original diesel electric rail-driven locomotive. On the basis of replacing a diesel generator set with a power battery system, a set of pre-charging system is required to be added to the pure electric railcar, and the pre-charging circuit is shown in figure 1.
Traditional pre-charge circuit can't satisfy two branch road independent control's battery system, if need satisfy two branch road independent control's battery system, then need directly increase one set of same pre-charge circuit, lead to can increasing equipment cost, and the uniformity requirement to controlling is higher moreover.
Aiming at the problems, a double-branch pre-charging circuit structure of the pure electric rail vehicle is needed to be provided so as to solve the problem of the traditional circuit; meanwhile, a control mode is needed to be provided, so that the reliability and the performance of the rail car are ensured, meanwhile, the filter inductance in the circuit is simplified, and the requirement of a double-branch pre-charging circuit of the pure electric rail locomotive is met.
Disclosure of Invention
In view of the above, in order to solve the above problems in the prior art, the present invention provides a dual-branch pre-charging circuit for a pure electric rail vehicle and a control method thereof, so as to achieve the purpose of simplifying the filter inductance in the circuit and meeting the requirement of the dual-branch pre-charging circuit for the pure electric rail vehicle while ensuring the reliability and performance of the rail vehicle.
The technical scheme adopted by the invention is as follows: a double-branch pre-charging circuit of a pure electric rail locomotive comprises a middle direct-current link capacitor, an A branch and a B branch which are connected to the middle direct-current link capacitor in parallel, wherein the A branch and the B branch both comprise a battery branch and discharging contactors respectively connected to two ends of the battery branch in series; the device also comprises a pre-charging branch circuit, wherein the positive end of each battery branch circuit is connected to the pre-charging branch circuit through a pre-charging diode, and the other end of the pre-charging branch circuit is connected to the positive end of the intermediate direct-current link capacitor; the pre-charging branch comprises a pre-charging contactor and a pre-charging resistor.
Furthermore, one end of the pre-charging contactor is connected with the positive end of the intermediate direct current link capacitor, the other end of the pre-charging contactor is connected with the pre-charging resistor, and the pre-charging resistor is connected with the pre-charging diode.
Furthermore, the battery branch comprises a power battery, and the positive end and the negative end of the power battery are sequentially connected with a maintenance switch in series so as to maintain the power battery after being switched off by the maintenance switch.
Furthermore, the circuits of the positive end and the negative end of the power battery are provided with current sensors, and the current sensors are positioned between the maintenance switch and the discharge contactor so as to monitor the current of each branch in real time.
Furthermore, the maintenance and repair switch is a maintenance switch with a fuse, so that the use safety of the maintenance and repair switch is improved.
Furthermore, the positive end and the negative end of the power battery are respectively connected with a positive high-voltage box and a negative high-voltage box, and the power battery is protected and disconnected by the positive high-voltage box and the negative high-voltage box and then is connected to a middle direct-current loop, so that the reliability is improved.
The invention also provides a control method of the double-branch pre-charging circuit of the pure electric rail locomotive, which is based on the double-branch pre-charging circuit of the pure electric rail locomotive and comprises the following steps:
(1) calculating the resistance R in a single branch in the main circuitGeneral assemblyAccording to the short-time reverse overcurrent capability I of the discharge contactorMaximum allowableObtaining UAB＝RGeneral assembly×IMaximum allowable；
(2) Closing a pre-charging contactor and starting pre-charging, and simultaneously charging the intermediate direct current link capacitor through a pre-charging resistor in the branch A and the branch B;
(3) the voltage of the intermediate DC link capacitor is set to be UC，AThe voltage of the battery branch in the branch is UAThe voltage of the battery branch in the B branch is UB；
If U isA>UBWhen U is formedCU is 0.85 to 0.95 timesAThen, the discharging contactor of the branch A is closed, the branch A is put into an intermediate direct current link, and at the moment, the branch U is connected with the discharging contactorC＝UAEntering the step (4);
if U isA<UBWhen U is formedCU is 0.85 to 0.95 timesBThen, the discharging contactor of the branch B is closed, the branch B is put into an intermediate direct current link, and at the moment, the branch U is connected with the discharging contactorC＝UBEntering the step (5);
(4) detecting the battery voltage if UA-UB<UABIf yes, putting into branch B; u shapeA-UB>UABIf the system is powered off, the branch B is not put into the system;
(5) detecting the battery voltage if UB-UA<UABThen, the branch A is put into; u shapeB-UA>UABAnd the branch A is not put into the power-off state of the system.
Further, the resistance value R in the step (1)General assemblyThe sum of the resistances of the line resistance, the discharge contactor and the maintenance and repair switch in the single branch.
The invention has the beneficial effects that:
1. by adopting the double-branch pre-charging circuit of the pure electric rail locomotive, the branch A and the branch B share the pre-charging contactor and the pre-charging resistor, compared with the traditional pre-charging circuit, when a battery system independently controlled by the double branches is met, one-branch pre-charging contact and pre-charging resistor can be reduced, the complexity of circuit control is simplified, and by adopting the double-branch pre-charging circuit, the filter inductance in a circuit loop is simplified, the weight and the cost of a rail car are reduced, and the reliability and the performance of the rail car are ensured.
2. The invention discloses a control method of a double-branch pre-charging circuit of a pure electric rail locomotive, which is based on UAAnd UBIn the charging of the intermediate DC link capacitorIn the process, can be according to UA、UB、UCAnd UABThe corresponding discharging contactor is switched according to the relation between the two discharging contactors, so that the requirement for efficient charging of the intermediate direct-current link capacitor is met, the A branch and the B branch are effectively utilized, double-branch pre-charging is achieved, the filter inductance in a circuit loop can be simplified while the reliability and performance of the rail car are guaranteed, and the overall cost is reduced.
Drawings
FIG. 1 is a circuit configuration diagram of a conventional precharge circuit;
FIG. 2 is a circuit diagram of a dual-branch pre-charging circuit of a pure electric rail locomotive according to the present invention;
the drawings are labeled as follows:
MSD-maintenance and overhaul switch, 1 SC-first current sensor, 2 SC-second current sensor, 3 SC-third current sensor, 4 SC-fourth current sensor, VD 1-first pre-charging diode, VD 2-second pre-charging diode, KF 1-first discharging contactor, KF 2-second discharging contactor, KF 3-third discharging contactor, KF 4-fourth discharging contactor, KY1 is a pre-charging contactor, and R1 is a pre-charging resistor.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar modules or modules having the same or similar functionality throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the application include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
Example 1
As shown in fig. 2, in this embodiment, a dual-branch pre-charging circuit of a pure electric rail locomotive is specifically provided, so as to satisfy a battery system with dual-branch independent control, and the dual-branch pre-charging circuit includes an intermediate dc link capacitor, and further includes an a branch and a B branch connected in parallel to the intermediate dc link capacitor, where the a branch includes an a battery branch, and a first discharging contactor and a third discharging contactor connected in series to a positive end and a negative end of the a battery branch, respectively; the B branch comprises a B battery branch, a second discharging contactor and a fourth discharging contactor which are respectively connected in series with the positive end and the negative end of the B battery branch, the first discharging contactor and the second discharging contactor are both in an off state, and the third discharging contactor and the fourth discharging contactor are both in an on state in an initial state. The battery A branch comprises a power battery A, and the positive end and the negative end of the power battery A are respectively connected with a maintenance and repair switch in series; the battery B branch comprises a power battery B, and the positive end and the negative end of the power battery B are respectively connected with a maintenance and repair switch in series; in order to improve the safety performance and the protection performance of the maintenance switch, in this embodiment, the maintenance switch is a maintenance switch with a fuse.
The battery pre-charging system comprises a battery A branch circuit, a battery B branch circuit and a middle direct current link capacitor, wherein the battery A branch circuit comprises a first battery, the battery B branch circuit comprises a second battery, the battery A branch circuit comprises a first direct current link capacitor and a second direct current link capacitor, the first direct current link capacitor is connected with the second direct current link capacitor, the second direct current link capacitor is connected with the first direct current link capacitor, and the second direct current link capacitor is connected with the second direct current link capacitor; the pre-charging branch comprises a pre-charging contactor and a pre-charging resistor, one end of the pre-charging contactor is connected with the positive end of the middle direct current link capacitor, the other end of the pre-charging contactor is connected with the pre-charging resistor, and the pre-charging resistor is connected with the pre-charging diode.
In order to realize real-time monitoring of the current in each branch, a first current sensor and a third current sensor are respectively arranged on circuits where the positive end and the negative end of the A power battery are located, the first current sensor is located between the maintenance and overhaul switch and the first discharge contactor, and the third current sensor is located between the maintenance and overhaul switch and the third discharge contactor; similarly, a second current sensor and a fourth current sensor are respectively arranged on the circuits where the positive end and the negative end of the B power battery are located, the second current sensor is located between the maintenance and overhaul switch and the second discharge contactor, and the fourth current sensor is located between the maintenance and overhaul switch and the fourth discharge contactor.
In order to improve the safety and reliability of the double-branch pre-charging circuit, the positive end and the negative end of the power battery are respectively connected with a positive high-voltage box and a negative high-voltage box, and the power battery is connected into the middle direct-current loop after being protected and disconnected by the positive high-voltage box and the negative high-voltage box.
Example 2
On the basis of embodiment 1, in order to implement that the dual-branch pre-charging circuit of the pure electric rail vehicle can be smoothly applied to the rail vehicle, the embodiment specifically provides a control method of the dual-branch pre-charging circuit of the pure electric rail vehicle, and the method is based on the dual-branch pre-charging circuit of the pure electric rail vehicle, and includes the following steps:
(1) the resistance value R in a single branch in the main loop is calculated based on the parameters of the respective devices in the two-branch precharge circuit of embodiment 1General assemblyI.e. calculating the resistance values R in the branch A and the branch BGeneral assemblySince the components in the branch A and the branch B are the same, the resistance R is the sameGeneral assemblyAre also equal according to the short-term reverse overcurrent capacity I of the discharge contactorMaximum allowableObtaining UAB＝RGeneral assembly×IMaximum allowable(ii) a Wherein the resistance value RGeneral assemblyThe service switch with the fuse also has a slight resistance for the sum of the resistances of the line resistance, the discharge contactor and the maintenance service switch in the individual branch.
(2) Closing a pre-charging contactor and starting pre-charging, simultaneously charging the intermediate direct-current link capacitor through a pre-charging resistor in the branch A and the branch B, and putting the branch A and the branch B into a charging link of the intermediate direct-current link capacitor at the moment;
(3) as shown in FIG. 2, the voltage of the intermediate DC link capacitor is set to UCThe voltage of the battery branch in the A branch is UAThe voltage of the battery branch in the B branch is UB；
If U isA>UBWhen U is formedCTo reach UBThen, the second pre-charging diode at the branch B is cut off in the reverse direction, and the branch A of the batteryContinuously charging when UCUp to 0.9 times UAThen, the discharging contactor of the branch A is closed, the branch A is put into an intermediate direct current link, and at the moment, the branch U is connected with the discharging contactorC＝UAEntering the step (4);
if U isA<UBWhen U is formedCTo reach UAThen, the first pre-charging diode in the branch A is cut off in the reverse direction, and the branch B continues to charge when the branch U is connectedCUp to 0.9 times UBThen, the discharging contactor of the branch B is closed, the branch B is put into an intermediate direct current link, and at the moment, the branch U is connected with the discharging contactorC＝UBEntering the step (5);
(4) detecting the battery voltage if UA-UB<UABIf yes, putting into branch B; u shapeA-UB>UABIf the system is powered off, the branch B is not put into the system, so that the branch B is prevented from being burnt out due to overlarge current;
(5) detecting the battery voltage if UB-UA<UABThen, the branch A is put into; u shapeB-UA>UABAnd the branch A is not put into the system until the system is powered off so as to prevent the branch A from being burnt out due to overlarge current.
When the power is turned on next time, the control logic, namely the step (1) to the step (5), is executed again to complete the double-branch pre-charging.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims (8)

1. A double-branch pre-charging circuit of a pure electric rail locomotive comprises a middle direct-current link capacitor and is characterized by further comprising an A branch and a B branch which are connected to the middle direct-current link capacitor in parallel, wherein the A branch and the B branch both comprise a battery branch and discharging contactors respectively connected to two ends of the battery branch in series; the device also comprises a pre-charging branch circuit, wherein the positive end of each battery branch circuit is connected to the pre-charging branch circuit through a pre-charging diode, and the other end of the pre-charging branch circuit is connected to the positive end of the intermediate direct-current link capacitor; the pre-charging branch comprises a pre-charging contactor and a pre-charging resistor.
2. A dual branch pre-charge circuit for a full electric rail vehicle as claimed in claim 1, wherein one end of the pre-charge contactor is connected to the positive terminal of the intermediate dc link capacitor, the other end of the pre-charge contactor is connected to the pre-charge resistor, and the pre-charge resistor is connected to the pre-charge diode.
3. A pure electric rail locomotive double branch pre-charging circuit according to claim 1, characterized in that the battery branch comprises a power battery, and a maintenance and repair switch is connected in series to both the positive terminal and the negative terminal of the power battery.
4. A pure electric rail locomotive double-branch pre-charging circuit according to claim 3, characterized in that a current sensor is arranged on the circuit of the positive terminal and the negative terminal of the power battery, and the current sensor is positioned between the maintenance and repair switch and the discharging contactor.
5. A pure electric rail locomotive double branch pre-charging circuit according to claim 3, characterized in that the maintenance and repair switch is provided as a fused maintenance switch.
6. A pure electric rail locomotive double-branch pre-charging circuit according to claim 3, characterized in that a positive high voltage box and a negative high voltage box are respectively connected to the positive terminal and the negative terminal of the power battery.
7. A control method of a dual-branch pre-charging circuit of a pure electric rail locomotive is characterized in that the method is based on the dual-branch pre-charging circuit of the pure electric rail locomotive as claimed in any one of claims 1 to 6, and comprises the following steps:
(1) calculating the resistance R in a single branch in the main circuitGeneral assemblyAccording to the short-time reverse overcurrent capability I of the discharge contactorMaximum allowableObtaining UAB＝RGeneral assembly×IMaximum allowable；
(2) Closing a pre-charging contactor and starting pre-charging, and simultaneously charging the intermediate direct current link capacitor through a pre-charging resistor in the branch A and the branch B;
(3) the voltage of the intermediate DC link capacitor is set to be UCThe voltage of the battery branch in the A branch is UAThe voltage of the battery branch in the B branch is UB；
If U isA>UBWhen U is formedCU is 0.85 to 0.95 timesAThen, the discharging contactor of the branch A is closed, the branch A is put into an intermediate direct current link, and at the moment, the branch U is connected with the discharging contactorC＝UAEntering the step (4);
if U isA<UBWhen U is formedCU is 0.85 to 0.95 timesBThen, the discharging contactor of the branch B is closed, the branch B is put into an intermediate direct current link, and at the moment, the branch U is connected with the discharging contactorC＝UBEntering the step (5);
(4) detecting battery powerPress, if UA-UB<UABIf yes, putting into branch B; u shapeA-UB>UABIf the system is powered off, the branch B is not put into the system;
(5) detecting the battery voltage if UB-UA<UABThen, the branch A is put into; u shapeB-UA>UABAnd the branch A is not put into the power-off state of the system.
8. A pure electric rail locomotive double-branch pre-charging circuit control method as claimed in claim 7, characterized in that the resistance value R in step (1)General assemblyThe sum of the resistances of the line resistance, the discharge contactor and the maintenance and repair switch in the single branch.
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CN105799516A (en) * 2016-03-22 2016-07-27 北京新能源汽车股份有限公司 High-voltage control box with high-voltage residual electricity discharging function and electric vehicle
DE102016005565A1 (en) * 2016-05-04 2017-11-09 Man Truck & Bus Ag Circuit arrangement for a DC link capacity
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CN108512423A (en) * 2018-05-23 2018-09-07 威腾电气集团股份有限公司 A kind of vehicle-mounted DCDC power supplys of high-efficiency high-power
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CN110303943A (en) * 2019-08-01 2019-10-08 中车资阳机车有限公司 The double branch power battery high-voltage parallel systems of pure electric vehicle rail locomotive and control method
CN211641853U (en) * 2020-01-14 2020-10-09 中车资阳机车有限公司 Double-branch pre-charging circuit of pure electric rail locomotive

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CN114274841A (en) * 2021-08-09 2022-04-05 中车资阳机车有限公司 Parallel direct-hanging control method for multi-branch power battery system
CN114274841B (en) * 2021-08-09 2023-05-23 中车资阳机车有限公司 Parallel direct-hanging control method for multi-branch power battery system

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