Protection system of railway ferry mobile energy storage power station charging device

Abstract

This utility model discloses a protection system for a charging device of a mobile energy storage power station for railway ferries, belonging to the field of railway ferry energy storage technology. It includes a PLC, a charging control module, contactors K1, K2, and K3, a mains power detection module, a battery pack, a DC / DC module, a reverse connection protection module, and a connector plug. It solves the technical problem of hard protection for DC power supplies based on three-contactor interlock control and hardware-level reverse connection isolation. This utility model does not rely on host computer programs or embedded logic control. Through the independent configuration of K1 discharge control, K2 charging control, and K3 output control, and the design of an auxiliary contact interlock mechanism, it effectively prevents malfunctions and mixed use of charging and discharging paths, achieves automatic switching between charging and discharging modes, prevents back current surges from external loads, improves system anti-interference and battery safety, and ensures stable operation under conditions such as humidity, mobility, and strong interference.

Description

Technical Field

[0001] This utility model belongs to the field of railway ferry energy storage technology, and in particular relates to the protection system of the charging device of the mobile energy storage station of railway ferry. Background Technology

[0002] With the increasing demand for high-power, mobile energy supply systems in railway ferry transportation and field operations, mobile energy storage stations are gradually becoming key power supply guarantee equipment. In current applications, mobile energy storage devices typically use integrated battery packs and DC / DC converters to provide DC power to external loads (such as rail vehicles and work equipment) via onboard connectors. Simultaneously, some devices support AC mains charging, possessing bidirectional energy flow capabilities. However, existing technologies still have the following significant shortcomings:

[0003] The lack of an effective charging and discharging isolation mechanism means that some systems control the energy input and output of the battery through a single contactor, which poses risks of malfunction, contactor sticking, or incorrect crossover of charging / discharging paths.

[0004] Without a complete hardware-level reverse connection or reverse current protection structure, reverse current surges can easily occur in cases of connection errors or power failure on the load side, causing battery damage or burning out of the charging module.

[0005] The charging and discharging control unit has problems such as ambiguous control boundaries and lack of interlocking mechanisms, which leads to untimely protection response when there are operational errors or logical conflicts. Utility Model Content

[0006] The purpose of this invention is to provide a protection system for the charging device of a mobile energy storage station on a railway ferry, which solves the technical problem of hard protection of DC power supply based on three-contactor interlock control and hardware-level reverse connection isolation.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The protection system for the charging device of the mobile energy storage station on the railway ferry includes a PLC, a charging control module, contactors K1, K2, and K3, a mains power detection module, a battery pack, a DC / DC module, a reverse connection protection module, and a connector plug.

[0009] The charging control module is connected to an external AC power supply. The output terminal of the charging control module is connected to the main contact group of contactor K2. The main contact group of contactor K2 is also connected to the battery pack. The control terminal of the charging controller module is connected to the PLC. The coil terminal of contactor K2 is connected to the PLC. The mains power detection module is connected to an external AC power supply. The mains power detection module is also connected to the PLC.

[0010] The battery pack is connected to the main contact group of contactor K1. The main contact group of contactor K1 is connected to the DC / DC module. The DC / DC module is connected to the main contact group of contactor K3. The main contact group of contactor K3 is connected to the reverse connection protection module. The reverse connection protection module is connected to the connector plug. The connector plug is connected to the external load.

[0011] Contactors K1 and K2 are interlocked through auxiliary contacts. The coil terminal of contactor K1 is connected to the PLC, the coil terminal of contactor K3 is connected to the PLC, and the auxiliary contact of contactor K3 is connected to the PLC.

[0012] Preferably, the charging control module is model NPB-450-24, the mains power detection module is model ZHT-PWR-S, the DC / DC module is model DCM3623T50M53C2T00, the PLC is model SIMATIC S7-1500, and the contactors K1, K2, and K3 are all DC contactors.

[0013] Preferably, the reverse connection protection module is a diode D1, and diode D1 is a Schottky diode.

[0014] Preferably, terminal 1 of contactor K1 is connected to the positive terminal BAT-DC+ of the battery pack, terminal 2 is connected to the input terminal of the DC / DC module, terminal A1 is connected to terminal 22 of contactor K2, terminal A2 is connected to the GND ground wire, terminal 22 is connected to a DO2 interface of the PLC, and terminal 21 is connected to terminal A1 of contactor K2.

[0015] Terminal 1 of the contactor K2 is connected to the output terminal of the charging control module, terminal 2 is connected to the positive terminal BAT-DC+ of the battery pack, terminal A2 is connected to the GND ground wire, terminal 21 is connected to terminal A1 of the contactor K1, and terminal 22 is connected to a DO1 interface of the PLC.

[0016] Terminal 1 of the contactor K3 is connected to the output terminal of the DC / DC module, terminal 2 is connected to the positive terminal of the diode D1, terminal 13 is connected to a DI1 interface of the PLC, terminal 14 is connected to the GND ground wire through resistor R1, terminal A1 is connected to a DO3 interface of the PLC, and terminal A2 is connected to the GND ground wire.

[0017] Connect the negative terminal of diode D1 to the connector plug, and connect the negative terminal of the battery pack to GND (ground wire).

[0018] The protection system of the charging device for the railway ferry mobile energy storage station described in this utility model solves the technical problem of hard protection of DC power supply based on three-contactor interlock control and hardware-level reverse connection isolation. This utility model uses a PLC in conjunction with DC contactors to control the charging, discharging and output permission paths, without relying on upper computer programs or embedded logic control. The discharge control K1, charging control K2 and output control K3 are configured independently, and an auxiliary contact interlock mechanism is designed to effectively prevent malfunctions and mixing of charging and discharging paths. The ZHT-PWR-S module is used to detect the external mains power status and, in conjunction with the PLC, switches the K1 / K2 states to realize automatic switching between charging and discharging modes. A high-power Schottky diode is used to build a reverse connection protection module to prevent external load back current impact, improve system anti-interference and battery safety. The entire system is vibration-resistant, moisture-proof, and has no communication dependence, ensuring stable operation under humid, mobile, and strong interference conditions. Attached Figure Description

[0019] Figure 1 This is a system architecture diagram of this utility model;

[0020] Figure 2 This is the interlocking wiring diagram for contactors K1 and K2 of this utility model;

[0021] Figure 3 This is the wiring diagram of contactor K3 of this utility model. Detailed Implementation

[0022] Depend on Figures 1-3 The protection system of the charging device for the mobile energy storage station on the railway ferry shown includes a PLC, a charging control module, contactors K1, K2, and K3, a mains power detection module, a battery pack, a DC / DC module, a reverse connection protection module, and a connector plug.

[0023] The charging control module is connected to an external AC power supply. The output terminal of the charging control module is connected to the main contact group of contactor K2. The main contact group of contactor K2 is also connected to the battery pack. The control terminal of the charging controller module is connected to the PLC. The coil terminal of contactor K2 is connected to the PLC. The mains power detection module is connected to an external AC power supply. The mains power detection module is also connected to the PLC.

[0024] The battery pack is connected to the main contact group of contactor K1. The main contact group of contactor K1 is connected to the DC / DC module. The DC / DC module is connected to the main contact group of contactor K3. The main contact group of contactor K3 is connected to the reverse connection protection module. The reverse connection protection module is connected to the connector plug. The connector plug is connected to the external load.

[0025] Contactors K1 and K2 are interlocked through auxiliary contacts. The coil terminal of contactor K1 is connected to the PLC, the coil terminal of contactor K3 is connected to the PLC, and the auxiliary contact of contactor K3 is connected to the PLC.

[0026] Terminal 1 of contactor K1 is connected to the positive terminal BAT-DC+ of the battery pack, terminal 2 is connected to the input terminal of the DC / DC module, terminal A1 is connected to terminal 22 of contactor K2, terminal A2 is connected to the GND ground wire, terminal 22 is connected to a DO2 interface of the PLC, and terminal 21 is connected to terminal A1 of contactor K2.

[0027] Terminal 1 of the contactor K2 is connected to the output terminal of the charging control module, terminal 2 is connected to the positive terminal BAT-DC+ of the battery pack, terminal A2 is connected to the GND ground wire, terminal 21 is connected to terminal A1 of the contactor K1, and terminal 22 is connected to a DO1 interface of the PLC.

[0028] Terminal 1 of the contactor K3 is connected to the output terminal of the DC / DC module, terminal 2 is connected to the positive terminal of the diode D1, terminal 13 is connected to a DI1 interface of the PLC, terminal 14 is connected to the GND ground wire through resistor R1, terminal A1 is connected to a DO3 interface of the PLC, and terminal A2 is connected to the GND ground wire.

[0029] Connect the negative terminal of diode D1 to the connector plug, and connect the negative terminal of the battery pack to GND (ground wire).

[0030] Preferably, the charging control module is model NPB-450-24, the mains power detection module is model ZHT-PWR-S, the DC / DC module is model DCM3623T50M53C2T00, the PLC is model SIMATIC S7-1500, and contactors K1, K2, and K3 are all DC contactors. The reverse connection protection module is diode D1, which is a Schottky diode.

[0031] The working principle of the hardware protection system of the charging device of the railway ferry mobile energy storage station is to realize the charging and discharging control of the charging device of the railway ferry mobile energy storage station through the interlocking and coordinated cooperation of contactor K1 and contactor K2, and to ensure the safety of the charging and discharging process through the hardware protection mechanism.

[0032] The hardware protection system of the charging device for the railway ferry mobile energy storage station features reverse connection protection and reverse discharge protection. It can be further developed with secondary software to enable functions such as switching between charging and discharging modes, ensuring stable operation of the equipment in environments with high vibration, high humidity, and strong interference.

[0033] During operation, the battery pack stores electrical energy to provide power to external loads. The battery pack is connected to the DC / DC module via contactor K1.

[0034] The DC / DC module is responsible for converting the DC voltage supplied by the battery pack into a suitable output voltage to meet the needs of the external load. The DC / DC module is connected to contactor K3, which controls whether the battery pack is allowed to output power to the external load.

[0035] Contactor K1 is responsible for discharge control, controlling the connection between the battery pack and the DC / DC module. In discharge mode, K1 is energized, allowing the battery pack's electrical energy to be output through the DC / DC module. K1's auxiliary normally closed contact is interlocked with contactor K2 to prevent simultaneous activation of the discharge and charging paths.

[0036] The PLC can control K1 to engage by outputting a 24V control signal, thus connecting the battery pack to the DC / DC module.

[0037] Contactor K2 is responsible for charging control, and it controls the charging path from the external AC power source to the battery pack. The AC power is supplied through the charging control module NPB-450-24, whose output is connected to the main contact group of K2.

[0038] During secondary development, it can be set that when an external mains power is connected, the mains power detection module detects the presence of external power, the PLC outputs a signal to drive K2 to engage, and the current is input to the battery pack through the charging control module; if the mains power is disconnected or the PLC does not provide a signal, K2 disconnects, and the charging path is cut off.

[0039] The secondary development logic in this embodiment is adapted to a specific application scenario; users can customize the PLC logic according to their needs.

[0040] Contactor K3 is responsible for output control. It controls whether the DC / DC module's output is allowed to pass through the reverse connection protection module, thus determining whether battery power can be transferred to an external load. K3 is interlocked with the PLC via its auxiliary normally closed contact to prevent erroneous operation.

[0041] During secondary development, it can be set that K3 will engage when the PLC sends a signal, allowing the output power of the DC / DC module to be supplied to the external load through the reverse connection protection module to the plug terminal.

[0042] K3 can feed back its status to the PLC through auxiliary contacts. The PLC can then determine the status of K3 based on the feedback signal and further adjust the system operation.

[0043] The mains power detection module is responsible for monitoring the status of the external mains power supply in real time. When mains power is connected, the module outputs a signal to the PLC, which can then determine whether to allow the charging mode to be activated based on this signal.

[0044] The reverse connection protection module consists of a Schottky diode D1, which is used to protect the system from reverse connection of external connectors and prevent reverse current from flowing into the battery pack or DC / DC module, thus preventing damage.

[0045] When the plug is connected correctly, diode D1 conducts, and electrical energy is output to the load through the reverse connection protection module. If the plug is connected in reverse, diode D1 does not conduct, preventing current backflow and protecting the system from damage.

[0046] The protection system of the charging device for the railway ferry mobile energy storage station described in this utility model solves the technical problem of hard protection of DC power supply based on three-contactor interlock control and hardware-level reverse connection isolation. This utility model uses a PLC in conjunction with DC contactors to control the charging, discharging and output permission paths, without relying on upper computer programs or embedded logic control. The discharge control K1, charging control K2 and output control K3 are configured independently, and an auxiliary contact interlock mechanism is designed to effectively prevent malfunctions and mixing of charging and discharging paths. The ZHT-PWR-S module is used to detect the external mains power status and, in conjunction with the PLC, switches the K1 / K2 states to realize automatic switching between charging and discharging modes. A high-power Schottky diode is used to build a reverse connection protection module to prevent external load back current impact, improve system anti-interference and battery safety. The entire system is vibration-resistant, moisture-proof, and has no communication dependence, ensuring stable operation under humid, mobile, and strong interference conditions.

Claims

1. A protection system for a charging device of a mobile energy storage station on a railway ferry, characterized in that: Includes PLC, charging control module, contactor K1, contactor K2, contactor K3, mains power detection module, battery pack, DC / DC module, reverse connection protection module and connector plug; The charging control module is connected to an external AC power supply. The output terminal of the charging control module is connected to the main contact group of contactor K2. The main contact group of contactor K2 is also connected to the battery pack. The control terminal of the charging controller module is connected to the PLC. The coil terminal of contactor K2 is connected to the PLC. The mains power detection module is connected to an external AC power supply. The mains power detection module is also connected to the PLC. The battery pack is connected to the main contact group of contactor K1. The main contact group of contactor K1 is connected to the DC / DC module. The DC / DC module is connected to the main contact group of contactor K3. The main contact group of contactor K3 is connected to the reverse connection protection module. The reverse connection protection module is connected to the connector plug. The connector plug is connected to the external load. Contactors K1 and K2 are interlocked through auxiliary contacts. The coil terminal of contactor K1 is connected to the PLC, the coil terminal of contactor K3 is connected to the PLC, and the auxiliary contact of contactor K3 is connected to the PLC.

2. The protection system for the charging device of the mobile energy storage station on the railway ferry as described in claim 1, characterized in that: The charging control module is model NPB-450-24, the mains power detection module is model ZHT-PWR-S, the DC / DC module is model DCM3623T50M53C2T00, the PLC is model SIMATIC S7-1500, and contactors K1, K2, and K3 are all DC contactors.

3. The protection system for the charging device of the mobile energy storage station on railway ferries as described in claim 1, characterized in that: The reverse connection protection module is diode D1, which is a Schottky diode.

4. The protection system for the charging device of the railway ferry mobile energy storage station as described in claim 3, characterized in that: Terminal 1 of contactor K1 is connected to the positive terminal BAT-DC+ of the battery pack, terminal 2 is connected to the input terminal of the DC / DC module, terminal A1 is connected to terminal 22 of contactor K2, terminal A2 is connected to the GND ground wire, terminal 22 is connected to a DO2 interface of the PLC, and terminal 21 is connected to terminal A1 of contactor K2. Terminal 1 of the contactor K2 is connected to the output terminal of the charging control module, terminal 2 is connected to the positive terminal BAT-DC+ of the battery pack, terminal A2 is connected to the GND ground wire, terminal 21 is connected to terminal A1 of the contactor K1, and terminal 22 is connected to a DO1 interface of the PLC. Terminal 1 of the contactor K3 is connected to the output terminal of the DC / DC module, terminal 2 is connected to the positive terminal of the diode D1, terminal 13 is connected to a DI1 interface of the PLC, terminal 14 is connected to the GND ground wire through resistor R1, terminal A1 is connected to a DO3 interface of the PLC, and terminal A2 is connected to the GND ground wire. Connect the negative terminal of diode D1 to the connector plug, and connect the negative terminal of the battery pack to GND (ground wire).

Images