Railway vehicle multi-power-source power supply switching circuit and control method

Abstract

The invention discloses a railway vehicle multi-power-source power supply switching circuit and a control method. The circuit is used for switching and selecting power supplies among a battery pack, a vehicle end I-path direct-current power supply, a vehicle end II-path direct-current power supply, a vehicle end I-path alternating-current power supply, a vehicle end II-path alternating-current power supply, an external alternating-current power supply and a generator set, and first to seventh power supply loops are arranged. According to the circuit and the control method, multiple power supplies can be automatically switched to supply power to the railway vehicle safely and efficiently.

Description

Technical Field

[0001] The present invention relates to a multi - power supply switching circuit and control method for railway vehicles. Background Art

[0002] The power supplies of railway vehicles usually include AC380V power supply and DC600V power supply. Railway vehicles usually also have a generator set, a battery pack and an external power supply box. How to safely, efficiently and automatically switch between multiple power supplies and avoid power supply failures has become a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0003] The present invention provides a multi - power supply switching circuit and control method for railway vehicles.

[0004] The present invention adopts the following technical solutions: A multi - power supply switching circuit for railway vehicles, which is used to switch and select a power supply among a battery pack, a first DC power supply at the vehicle end, a second DC power supply at the vehicle end, a first AC power supply at the vehicle end, a second AC power supply at the vehicle end, an external AC power supply and a generator set, includes:

[0005] A first power supply circuit, connecting the battery pack and an inverter. The inverter is used to convert the DC power supply of the battery pack into three - phase alternating current and drive the load. A voltage transmitter for detecting the output voltage of the battery pack, a circuit breaker for disconnecting the first power supply circuit, and a contactor for connecting the first power supply circuit are arranged on the first power supply circuit;

[0006] A second power supply circuit, connecting the first DC power supply at the vehicle end and the inverter. The inverter is used to convert the DC power supply of the first DC power supply at the vehicle end into three - phase alternating current and drive the load. A voltage transmitter for detecting the output voltage of the first DC power supply at the vehicle end, a circuit breaker for disconnecting the second power supply circuit, and a contactor for connecting the second power supply circuit are arranged on the second power supply circuit;

[0007] A third power supply circuit, connecting the first AC power supply at the vehicle end and the load. A judgment relay for judging whether there is an alternating current output, a voltage transmitter for detecting the AC voltage value, a frequency transmitter for detecting the AC frequency value, a circuit breaker for disconnecting the third power supply circuit, and a contactor for connecting the third power supply circuit are arranged on the third power supply circuit;

[0008] A fourth power supply circuit, connecting the second DC power supply at the vehicle end and the inverter. The inverter is used to convert the DC power supply of the second DC power supply at the vehicle end into three - phase alternating current and drive the load. A voltage transmitter for detecting the output voltage of the second DC power supply at the vehicle end, a circuit breaker for disconnecting the fourth power supply circuit, and a contactor for connecting the fourth power supply circuit are arranged on the fourth power supply circuit;

[0009] The fifth power supply circuit is connected to the on-vehicle II-way AC power supply and the load. A judgment relay for judging whether there is AC power output, a voltage transmitter for detecting the AC voltage value, a frequency transmitter for detecting the AC frequency value, a circuit breaker for disconnecting the fifth power supply circuit, and a contactor for connecting the fifth power supply circuit are provided on the fifth power supply circuit;

[0010] The sixth power supply circuit is connected to the external AC power supply and the load. A judgment relay for judging whether there is AC power output, a voltage transmitter for detecting the AC voltage value, a frequency transmitter for detecting the AC frequency value, a circuit breaker for disconnecting the sixth power supply circuit, and a contactor for connecting the sixth power supply circuit are provided on the sixth power supply circuit;

[0011] The seventh power supply circuit is connected to the generator set and the load. A judgment relay for judging whether there is AC power output, a voltage transmitter for detecting the AC voltage value, a frequency transmitter for detecting the AC frequency value, a circuit breaker for disconnecting the seventh power supply circuit, and a contactor for connecting the seventh power supply circuit are provided on the seventh power supply circuit.

[0012] Optionally, it further includes: a first leakage detection device for detecting the total DC leakage of all DC power supply circuits.

[0013] Optionally, it further includes: a second leakage detection device for detecting the total AC leakage current of all AC circuits.

[0014] Optionally, the second power supply circuit and the third power supply circuit share a voltage transmitter and a frequency transmitter.

[0015] Optionally, the fourth power supply circuit and the fifth power supply circuit share a voltage transmitter and a frequency transmitter.

[0016] Optionally, it further includes a system controller connected to each judgment relay, each voltage transmitter, each circuit breaker, each contactor, and each frequency transmitter.

[0017] Optionally, it further includes a system controller connected to each judgment relay, each voltage transmitter, each circuit breaker, each contactor, each frequency transmitter, the first leakage detection device, and the second leakage detection device.

[0018] Optionally, it further includes a mode selection switch, an AC power supply selection switch, and a DC power supply selection switch. When the mode selection switch is in the automatic gear, each contactor is controlled by the system controller. When the mode selection switch is in the manual gear, the contactors connecting each AC power supply are controlled by the AC power supply selection switch, and the contactors connecting each DC power supply are controlled by the DC power supply selection switch.

[0019] Optionally, all the contactors connecting the AC power supply are controlled in a linked manner.

[0020] Optionally, the contactors all connected to the DC power supply are interlocked and controlled.

[0021] The present invention adopts the following technical solution: A control method for the multi-power supply switching circuit of the above-mentioned railway vehicle, including:

[0022] In the automatic mode, the priority of the on-vehicle DC power supply I, the on-vehicle DC power supply II, the on-vehicle AC power supply I, and the on-vehicle AC power supply II is the same and greater than the priority of the external AC power supply, the priority of the external AC power supply is greater than the priority of the generator set, and the priority of the generator set is greater than the priority of the battery pack;

[0023] The priority judgment criteria for the on-vehicle DC power supply I and the on-vehicle DC power supply II include the sum of the vehicle number and the date of this vehicle;

[0024] The priority judgment criteria for the on-vehicle AC power supply I and the on-vehicle AC power supply II include the sum of the vehicle number and the date of this vehicle;

[0025] The on-vehicle DC power supply I and the on-vehicle DC power supply II are taken as a group, and the on-vehicle AC power supply I and the on-vehicle AC power supply II are taken as a group, and the two groups do not supply power simultaneously.

[0026] This circuit and control method can safely and efficiently switch multiple power supplies to supply power to railway vehicles. Description of the Drawings

[0027] Figure 1 is a partial circuit diagram of the multi-power supply switching circuit of the railway vehicle according to the embodiment of the present invention.

[0028] Figure 2 is a partial circuit diagram of the multi-power supply switching circuit of the railway vehicle according to the embodiment of the present invention. Detailed Embodiments

[0029] The present invention will be further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0030] Such as Figure 1 and Figure 2As shown in the figure, the multi-power supply switching circuit of the railway vehicle of the present invention can receive power supply from a battery pack (hereinafter, DC600V battery is taken as an example for illustration), the first DC power supply at the vehicle end (hereinafter, the first DC600V power supply at the vehicle end is taken as an example for illustration), the first AC power supply at the vehicle end (hereinafter, the first AC380V power supply at the vehicle end is taken as an example for illustration), the second DC power supply at the vehicle end (hereinafter, the second DC600V power supply at the vehicle end is taken as an example for illustration), the second AC power supply at the vehicle end (hereinafter, the second AC380V power supply at the vehicle end is taken as an example for illustration), a generator set (hereinafter, a diesel generator set is taken as an example for illustration), and an external AC power supply, and select one of the power supplies to supply power to the railway vehicle. When the power supply is DC600V, the DC600V power supply can be converted into AC380V to supply power to the load. The system controller is illustrated by a programmable logic controller (PLC).

[0031] A first voltage transmitter V1, a first circuit breaker QF1, and a first contactor KM1 are arranged in the loop where the output end of the battery pack is located. The first voltage transmitter V1 is used to detect the voltage value of this loop and transmit the actual voltage to the PLC. The first circuit breaker QF1 is used to protect this loop against short circuit and overcurrent. The state of the first circuit breaker QF1 is transmitted to the PLC in the form of detecting the auxiliary contact. The first contactor KM1 is used for the power supply on / off of this loop. The on / off of the coil is controlled by the PLC or manually. The state of the first contactor KM1 is transmitted to the PLC in the form of detecting its auxiliary contact.

[0032] A first judgment relay KA1, a second voltage transmitter V2, a first frequency transmitter F1, a second circuit breaker QF2, a third circuit breaker QF3, a second contactor KM2, a third contactor KM3, and a fourth contactor KM4 are arranged in the loop where the output end of the first DC power supply at the vehicle end and the first AC power supply at the vehicle end are located. Among them, the first judgment relay KA1 is used to judge whether the current power supply of this loop is an AC380V power supply. When the AC380V power supply is provided, the first judgment relay KA1 is energized. In other cases, the first judgment relay KA1 is not energized. The contact state is transmitted to the PLC. The second voltage transmitter V2 is used to detect the voltage value of this loop and transmit the actual voltage to the PLC. The first frequency transmitter F1 is used to detect the power supply frequency value of this loop and transmit the actual frequency to the PLC. The second circuit breaker QF2 and the third circuit breaker QF3 are used to protect this loop against short circuit and overcurrent. The breaker states of the second circuit breaker QF2 and the third circuit breaker QF3 are transmitted to the PLC in the form of detecting the auxiliary contacts. The second contactor KM2, the third contactor KM3, and the fourth contactor KM4 are used for the power supply on / off of this loop. The on / off of the coil is controlled by the PLC or manually. The contactor states of the second contactor KM2, the third contactor KM3, and the fourth contactor KM4 are transmitted to the PLC in the form of detecting their auxiliary contacts.

[0033] In the output terminal of the vehicle-end II-way DC power supply and the loop where the vehicle-end II-way AC power supply is located, a second judgment relay KA2, a third voltage transmitter V3, a second frequency transmitter F2, a fourth circuit breaker QF4, a fifth circuit breaker QF5, a fifth contactor KM5, a sixth contactor KM6, and a seventh contactor KM7 are set. Among them, the second judgment relay KA2 is used to judge whether the current power supply of this loop is an AC380V power supply. When the AC380V power supply is provided, the second judgment relay KA2 is energized. In other cases, the second judgment relay KA2 is not energized, and its contact state is transmitted to the PLC. The third voltage transmitter V3 is used to detect the voltage value of this loop and transmit the actual voltage to the PLC. The second frequency transmitter F2 is used to detect the power supply frequency value of this loop and transmit the actual frequency to the PLC. The fourth circuit breaker QF4 and the fifth circuit breaker QF5 are used for short-circuit and over-current protection of this loop, and the breaker states of the two are transmitted to the PLC in the form of detecting auxiliary contacts. The fifth contactor KM5, the sixth contactor KM6, and the seventh contactor KM7 are used for power supply on / off control of this loop. The coil on / off is set by the PLC or manually, and the contactor states of the three are transmitted to the PLC in the form of detecting their auxiliary contacts.

[0034] In the loop where the output terminal of the external AC power supply is located, a third judgment relay KA3, a fourth voltage transmitter V4, a third frequency transmitter F3, a sixth circuit breaker QF6, and an eighth contactor KM8 are set. Among them, the third judgment relay KA3 is used to judge whether the current power supply of this loop is an AC380V power supply. When the AC380V power supply is provided, the third judgment relay KA3 is energized. In other cases, the third judgment relay KA3 is not energized, and its contact state is transmitted to the PLC. The fourth voltage transmitter V4 is used to detect the voltage value of this loop and transmit the actual voltage to the PLC. The third frequency transmitter F3 is used to detect the power supply frequency value of this loop and transmit the actual frequency to the PLC. The sixth circuit breaker QF6 is used for short-circuit and over-current protection of this loop, and the breaker state of the sixth circuit breaker QF6 is transmitted to the PLC in the form of detecting an auxiliary contact. The eighth contactor KM8 is used for power supply on / off control of this loop. The coil on / off is controlled by the PLC or manually, and its contactor state is transmitted to the PLC in the form of detecting its auxiliary contact.

[0035] In the circuit where the output terminal of the generator set is located, a fourth judgment relay KA4, a fifth voltage transmitter V5, a fourth frequency transmitter F4, a seventh circuit breaker QF7, and a ninth contactor KM9 are set. Among them, the fourth judgment relay KA4 is used to judge whether the current power supply in this circuit is an AC380V power supply. When the AC380V power supply is provided, the fourth judgment relay KA4 is energized. In other cases, the fourth judgment relay KA4 is not energized, and its contact state is transmitted to the PLC. The fifth voltage transmitter V5 is used to detect the voltage value of this circuit and transmit the actual voltage to the PLC. The fourth frequency transmitter F4 is used to detect the power supply frequency value of this circuit and transmit the actual frequency to the PLC. The seventh circuit breaker QF7 is used to protect this circuit against short circuit and overcurrent, and the circuit breaker state is transmitted to the PLC in the form of detecting auxiliary contacts. The ninth contactor KM9 is used for the power supply on and off of this circuit. The coil on and off is controlled by the PLC or manually, and the contactor state is transmitted to the PLC in the form of detecting its auxiliary contacts.

[0036] The first leakage detection device and the second leakage detection device detect the leakage values of the DC power supply main circuit and the AC power supply main circuit in real time and transmit the leakage values to the PLC.

[0037] The inverter is used to convert the DC600V power supply into AC380V to supply power to the load.

[0038] Figure 1 The control circuit of the multi-power supply switching circuit for the railway vehicle shown includes a PLC input-output part and a manual switching control part.

[0039] The PLC input-output part includes: (1) PLC digital input (DI): emergency power-off button input, automatic input of the mode selection switch, contacts input of the first to fourth judgment relays KA1~KA4, auxiliary contacts input of the first to seventh circuit breakers QF1~QF7, auxiliary contacts input of the first to ninth contactors KM1~KM9; (2) PLC analog input (AI): DC600V power supply voltage provided by the first voltage transmitter V1, I-way power supply voltage provided by the second voltage transmitter V2, I-way power supply frequency provided by the first frequency transmitter F1, II-way power supply voltage provided by the third voltage transmitter, II-way power supply frequency provided by the second frequency transmitter F2, external AC power supply voltage provided by the fourth voltage transmitter V4, external AC power supply frequency provided by the third frequency transmitter F3, generator set output voltage provided by the fifth voltage transmitter V5, generator set power supply frequency provided by the fourth frequency transmitter F4; (3) PLC digital output (DO): automatic diesel engine power supply output D001, automatic external AC power supply output D002, automatic AC I-way power supply output D003, automatic AC II-way power supply output D004, automatic DC I-way power supply output D005, automatic DC II-way power supply output D006, automatic battery pack power supply output D007.

[0040] The manual switching control part includes: an emergency power-off button, a mode selection switch (from left to right are the automatic gear, stop gear, manual AC gear, manual DC gear), an AC power supply selection switch (from left to right are the diesel generator gear, stop gear, external power supply gear, stop gear, AC I circuit gear, stop gear, AC II circuit gear), and a DC power supply selection switch (from left to right are the battery pack gear, stop gear, DC I circuit gear, stop gear, DC II circuit gear).

[0041] According to the railway vehicle technical specifications, the vehicle-end I circuit DC power supply (abbreviated as DC I circuit) and the vehicle-end I circuit AC power supply (abbreviated as AC I circuit) do not supply power simultaneously, and the vehicle-end II circuit DC power supply (abbreviated as DC II circuit) and the vehicle-end II circuit AC power supply (abbreviated as AC II circuit) do not supply power simultaneously. The power supply voltage range of the DC I circuit and the DC II circuit is DC500V - DC700V. The power supply voltage range of the diesel generator set, the external AC power supply, the AC I circuit power supply, and the AC II circuit power supply is AC380V ± 5%, and the frequency range is 50 ± 1Hz.

[0042] Reference Figure 2 , when the mode selection switch is in the automatic gear, each contactor is controlled by the system controller. When the mode selection switch is in the manual gear, the contactors connecting each AC power supply are controlled by the AC power supply selection switch, and the contactors connecting each DC power supply are controlled by the DC power supply selection switch.

[0043] Optionally, all the contactors connecting the AC power supplies are controlled in a linked manner. For example Figure 2 when the ninth contactor KM9 is connected in , the hardware circuit makes the fourth contactor KM4, the seventh contactor KM7, and the eighth contactor KM8 automatically in the off state. Thus, the generator set supplies power to the load, while the external AC power supply, the vehicle-end I circuit AC power supply, and the vehicle-end II circuit AC power supply are disconnected from the load.

[0044] Optionally, all the contactors connecting the DC power supplies are controlled in a linked manner. For example Figure 2 when the first contactor KM1 in is connected, the hardware circuit makes the second contactor KM2 and the fifth contactor KM5 automatically in the off state. Thus, the battery pack supplies power to the inverter, while the vehicle-end I circuit DC power supply and the vehicle-end II circuit DC power supply are disconnected from the load.

[0045] It should be noted that Figure 1 the vehicle-end I circuit DC power supply and the vehicle-end I circuit AC power supply share the second voltage transmitter V2 and the first frequency transmitter F1 in . In another embodiment, the second power supply circuit and the third power supply circuit are separated from each other.

[0046] The following describes the control method for the above circuit.

[0047] The PLC detection and fault judgment logic is as follows.

[0048] (1) Detection of the DC600V battery pack power supply circuit: The PLC receives the feedback value of the first voltage transmitter V1. When the voltage detected by the first voltage transmitter V1 is greater than 0V and the voltage value is between 500V and 700V, it is determined that the DC600V battery pack power supply is normal; when the voltage detected by the first voltage transmitter V1 is greater than 0V but the voltage value is in the range less than 500V or greater than 700V, it is determined that the DC600V battery pack power supply is abnormal; when the voltage detected by the first voltage transmitter V1 is less than or equal to 0V, it is determined that the DC600V battery pack is not powered.

[0049] (2) Detection of the DC I and AC I power supply circuits: The PLC receives the feedback information of the first judgment relay KA1, the second voltage transmitter V2, and the first frequency transmitter F1. When the first judgment relay KA1 is energized and its contacts are closed, it indicates that AC power supply is in progress at this time, and the feedback values of the second voltage transmitter V2 and the first frequency transmitter F1 are judged. If the feedback voltage of the second voltage transmitter V2 is within the range of 380V ± 5% and the feedback frequency value of the first frequency transmitter F1 is within the range of 50 ± 1Hz, the AC I power supply is normal; if the feedback voltage of the second voltage transmitter V2 is not within the range of 380V ± 5% or the feedback frequency value of the first frequency transmitter F1 is not within the range of 50 ± 1Hz, the AC I power supply is abnormal; when the first judgment relay KA1 is not energized and its contacts are not closed, the feedback value of the second voltage transmitter V2 is judged. If the voltage detected by the second voltage transmitter V2 is greater than 0V and the voltage value is between 500V and 700V, the DC I power supply is normal; when the voltage detected by the second voltage transmitter V2 is greater than 0V but the voltage value is less than 500V or greater than 700V, it is determined that the DC I power supply is abnormal; when the voltage detected by the second voltage transmitter V2 is less than or equal to 0V, it is determined that the AC I and DC I power supplies are not powered;

[0050] (3) Detection of DC II power supply circuit and AC II power supply circuit: The PLC receives the feedback information of the second judgment relay KA2, the third voltage transmitter V3, and the second frequency transmitter F2. When the second judgment relay KA2 is energized and its contacts are closed, it indicates that the power supply is AC at this time, and the feedback values of the third voltage transmitter V3 and the second frequency transmitter F2 are judged. If the feedback voltage of the third voltage transmitter V3 is within the range of 380V ± 5% and the feedback frequency value of the second frequency transmitter F2 is within the range of 50 ± 1Hz, the AC II power supply is normal; if the feedback voltage of the third voltage transmitter V3 is not within the range of 380V ± 5% or the feedback frequency value of the second frequency transmitter F2 is not within the range of 50 ± 1Hz, the AC II power supply is abnormal; when the second judgment relay KA2 is not energized and its contacts are not closed, the feedback value of the third voltage transmitter V3 is judged. If the detected voltage of the third voltage transmitter V3 is greater than 0V and the voltage value is between 500V and 700V, the DC II power supply is normal; when the detected voltage of the third voltage transmitter V3 is greater than 0V but the voltage value is less than 500V or greater than 700V, the DC II power supply is abnormal; when the detected voltage of the third voltage transmitter V3 is less than or equal to 0V, the AC II power supply circuit and the DC II power supply circuit are not powered;

[0051] (4) Detection of external power supply circuit: The PLC receives the feedback information of the third judgment relay KA3, the fourth voltage transmitter V4, and the third frequency transmitter F3. When the third judgment relay KA3 is energized and its contacts are closed, it indicates that the external AC power supply is powered on at this time, and the feedback values of the fourth voltage transmitter V4 and the third frequency transmitter F3 are judged. If the feedback voltage of the fourth voltage transmitter V4 is within the range of 380V ± 5% and the feedback frequency value of the third frequency transmitter F3 is within the range of 50 ± 1Hz, the external AC power supply is normal; if the feedback voltage of the fourth voltage transmitter V4 is not within the range of 380V ± 5% or the feedback frequency value of the third frequency transmitter F3 is not within the range of 50 ± 1Hz, the external power supply is abnormal; when the third judgment relay KA3 is not energized and its contacts are not closed, it indicates that the external AC power supply is not powered.

[0052] (5) Detection of the power supply circuit of the generator set: The PLC receives the feedback information of the fourth judgment relay KA4, the fifth voltage transmitter V5, and the fourth frequency transmitter F4. When the fourth judgment relay KA4 is powered on and its contacts are closed, it indicates that the generator set is powered at this time, and the feedback values of the fifth voltage transmitter V5 and the fourth frequency transmitter F4 are judged. If the feedback voltage of the fifth voltage transmitter V5 is within the range of 380V ± 5% and the feedback frequency value of the fourth frequency transmitter F4 is within the range of 50 ± 1Hz, the power supply of the generator set is normal; if the feedback voltage of the fifth voltage transmitter V5 is not within the range of 380V ± 5% or the feedback frequency value of the fourth frequency transmitter F4 is not within the range of 50 ± 1Hz, the power supply of the generator set is abnormal; when the fourth judgment relay KA4 is not powered on and its contacts are not closed, the generator set is not powered.

[0053] (6) Detection of DC power supply leakage: The PLC receives the leakage detection value output by the first leakage detection device LJ1 in real time. When the leakage value is less than 50mA, the DC power supply leakage detection is normal; when the leakage value is greater than or equal to 50mA and less than 100mA, the DC power supply leakage detection is at the first level of abnormality; when the leakage value is greater than or equal to 100mA and less than 150mA, the DC power supply leakage detection is at the second level of abnormality; when the leakage value is greater than or equal to 150mA, the DC power supply has a leakage fault. When a leakage alarm occurs, the PLC cuts off the current DC power supply circuit.

[0054] (7) Detection of AC power supply leakage: The PLC receives the AC power supply leakage detection value output by the second leakage detection device LJ2 in real time. When the leakage value is less than 50mA, the AC power supply leakage detection is normal; when the leakage value is greater than or equal to 50mA and less than 100mA, the AC power supply leakage detection is at the first level of abnormality; when the leakage value is greater than or equal to 100mA and less than 150mA, the AC power supply leakage detection is at the second level of abnormality; when the leakage value is greater than or equal to 150mA, the AC power supply has a leakage fault. When a leakage alarm occurs, the PLC cuts off the current power supply circuit.

[0055] (8) Detection of contactor faults: The PLC monitors the status of the auxiliary contacts of the first contactor KM1 to the ninth contactor KM9 in real time.

[0056] In the automatic mode, when the PLC outputs power supply from the automatic battery pack, but the contacts of the first contactor KM1 are not closed, then the first contactor KM1 has an output fault; in the automatic mode, when the PLC does not output power supply from the automatic battery pack, but the contacts of the first contactor KM1 are closed, then the first contactor KM1 has a split fault.

[0057] In the automatic mode, when the PLC outputs power supply from the automatic DC circuit I, but the contacts of the second contactor KM2 are not closed, then the second contactor KM2 has an output fault; in the automatic mode, when the PLC does not output power supply from the automatic DC circuit I, but the contacts of the second contactor KM2 are closed, then the second contactor KM2 has a split fault.

[0058] In the automatic mode, when the PLC supplies power to the automatic DC I circuit and outputs, but the contacts of the third contactor KM3 are not closed, the third contactor KM3 outputs a fault; in the automatic mode, when the PLC does not supply power to the automatic DC I circuit but the contacts of the third contactor KM3 are closed, the third contactor KM3 has a sticking-open fault.

[0059] In the automatic mode, when the PLC supplies power to the automatic AC I circuit and outputs, but the contacts of the fourth contactor KM4 are not closed, the fourth contactor KM4 outputs a fault; in the automatic mode, when the PLC does not supply power to the automatic AC I circuit group but the contacts of the fourth contactor KM4 are closed, the fourth contactor KM4 has a sticking-open fault.

[0060] In the automatic mode, when the PLC supplies power to the automatic DC II circuit and outputs, but the contacts of the fifth contactor KM5 are not closed, the fifth contactor KM5 outputs a fault; in the automatic mode, when the PLC does not supply power to the automatic DC II circuit but the contacts of the fifth contactor KM5 are closed, the fifth contactor KM5 has a sticking-open fault.

[0061] In the automatic mode, when the PLC supplies power to the automatic DC II circuit and outputs, but the contacts of the sixth contactor KM6 are not closed, the sixth contactor KM6 outputs a fault; in the automatic mode, when the PLC does not supply power to the automatic DC II circuit but the contacts of the sixth contactor KM6 are closed, the sixth contactor KM6 has a sticking-open fault.

[0062] In the automatic mode, when the PLC supplies power to the automatic AC II circuit and outputs, but the contacts of the seventh contactor KM7 are not closed, the seventh contactor KM7 outputs a fault; in the automatic mode, when the PLC does not supply power to the automatic AC II circuit group but the contacts of the seventh contactor KM7 are closed, the seventh contactor KM7 has a sticking-open fault.

[0063] In the automatic mode, when the PLC supplies power to the automatic external AC power supply and outputs, but the contacts of the eighth contactor KM8 are not closed, the eighth contactor KM8 outputs a fault; in the automatic mode, when the PLC does not supply power to the automatic external power supply but the contacts of the eighth contactor KM8 are closed, the eighth contactor KM8 has a sticking-open fault.

[0064] In the automatic mode, when the PLC supplies power to the automatic generator set and outputs, but the contacts of the ninth contactor KM9 are not closed, the ninth contactor KM9 outputs a fault; in the automatic mode, when the PLC does not supply power to the automatic motor set but the contacts of the ninth contactor KM9 are closed, the ninth contactor KM9 has a sticking-open fault.

[0065] Sensor fault detection

[0066] Voltage transmitter: The PLC detects the feedback value of the voltage transmitter. If the voltage value is greater than 1000V or less than -10V, the voltage transmitter has a fault.

[0067] Frequency transmitter: The PLC detects the feedback value of the frequency transmitter. If the frequency value is greater than 100HZ or less than 0HZ, the voltage transmitter fails.

[0068] Automatic mode power supply control:

[0069] When the mode selection switch is placed in the

Automatic

[0070] (1) Selection of Circuit I and Circuit II. The PLC makes a judgment based on the vehicle number of this vehicle. If the sum of the vehicle number of this vehicle and the date is odd, Circuit I is preferentially selected for power supply. If Circuit I power supply is abnormal or not powered, Circuit II is selected for power supply; if the sum of the vehicle number of this vehicle and the date is even, Circuit II is preferentially selected for power supply. If Circuit II power supply is abnormal or not powered, Circuit I is selected for power supply.

[0071] (2) Output logic of automatic AC Circuit I power supply (Fourth contactor KM4): Automatic mode ∩ Emergency power-off button not input ∩ (The sum of the vehicle number of this vehicle and the date is odd ∪ (The sum of the vehicle number of this vehicle and the date is even ∩ AC Circuit II not powered)) ∩ AC Circuit I normal ∩ Fourth contactor KM4 without fault ∩ Sensor without fault ∩ Third circuit breaker QF3 closed ∩ AC380V leakage detection without fault ∩ First contactor KM1 without output ∩ Second contactor KM2 without output ∩ Third contactor KM3 without output ∩ Fifth contactor KM5 without output ∩ Sixth contactor KM6 without output ∩ Seventh contactor KM7 without output ∩ Eighth contactor KM8 without output ∩ Ninth contactor KM9 without output. When the above conditions are met, the PLC outputs automatic AC Circuit I power supply, and the fourth contactor KM4 is energized. At this time, the vehicle load is powered by AC Circuit I.

[0072] (3) Output logic of automatic AC Circuit II power supply (Seventh contactor KM7): Automatic mode ∩ Emergency power-off button not input ∩ (The sum of the vehicle number of this vehicle and the date is even ∪ (The sum of the vehicle number of this vehicle and the date is odd ∩ AC Circuit I not powered)) ∩ AC Circuit II normal ∩ Seventh contactor KM7 without fault ∩ Sensor without fault ∩ Fifth circuit breaker QF5 closed ∩ AC380V leakage detection without fault ∩ First contactor KM1 without output ∩ Second contactor KM2 without output ∩ Third contactor KM3 without output ∩ Fourth contactor KM4 without output ∩ Fifth contactor KM5 without output ∩ Sixth contactor KM6 without output ∩ Eighth contactor KM8 without output ∩ Ninth contactor KM9 without output. When the above conditions are met, the PLC outputs automatic AC Circuit II power supply, and the seventh contactor KM7 is energized. At this time, the vehicle load is powered by AC Circuit II.

[0073] (4) Automatic DC Circuit I Power Supply (Second Contactor KM2, Third Contactor KM3) Output Logic

[0074] Automatic mode ∩ Emergency power-off button not input ∩ (Sum of vehicle number and date of this vehicle is odd ∪ (Sum of vehicle number and date of this vehicle is even ∩ DC Circuit II not powered)) ∩ DC Circuit I normal ∩ Second contactor KM2 without fault ∩ Third contactor KM3 without fault ∩ Sensor without fault ∩ Second circuit breaker QF2 closed ∩ DC600V leakage detection without fault ∩ First contactor KM1 without output ∩ Fourth contactor KM4 without output ∩ Fifth contactor KM5 without output ∩ Sixth contactor KM6 without output ∩ Seventh contactor KM7 without output ∩ Eighth contactor KM8 without output ∩ Ninth contactor KM9 without output. When the above conditions are met, the PLC automatically outputs the DC Circuit I power supply, and the second contactor KM2 and the third contactor KM3 are energized. At this time, the DC Circuit I supplies power to the vehicle load through the DC600V / AC380V inverter.

[0075] (5) Automatic DC Circuit II Power Supply (Fifth Contactor KM5, Sixth Contactor KM6) Output Logic

[0076] Automatic mode ∩ Emergency power-off button not input ∩ (Sum of vehicle number and date of this vehicle is even ∪ (Sum of vehicle number and date of this vehicle is odd ∩ DC Circuit I not powered)) ∩ DC Circuit II normal ∩ Fifth contactor KM5 without fault ∩ Sixth contactor KM6 without fault ∩ Sensor without fault ∩ Fourth circuit breaker QF4 closed ∩ DC600V leakage detection without fault ∩ First contactor KM1 without output ∩ Second contactor KM2 without output ∩ Third contactor KM3 without output ∩ Fourth contactor KM4 without output ∩ Seventh contactor KM7 without output ∩ Eighth contactor KM8 without output ∩ Ninth contactor KM9 without output. When the above conditions are met, the PLC automatically outputs the DC Circuit II power supply, and the fifth contactor KM5 and the sixth contactor KM6 are energized. At this time, the DC Circuit II supplies power to the vehicle load through the DC600V / AC380V inverter.

[0077] (6) Automatic External Power Supply (Eighth Contactor KM8) Output Logic

[0078] Automatic mode ∩ Emergency power-off button not input ∩ AC circuit I not powered ∩ AC circuit II not powered ∩ DC circuit I not powered ∩ DC circuit II not powered ∩ External power supply normal ∩ Eighth contactor KM8 contactor without fault ∩ Sensor without fault ∩ Sixth circuit breaker QF6 closed ∩ AC380V leakage detection without fault ∩ First contactor KM1 without output ∩ Second contactor KM2 without output ∩ Third contactor KM3 without output ∩ Fourth contactor KM4 without output ∩ Fifth contactor KM5 without output ∩ Sixth contactor KM6 without output ∩ Seventh contactor KM7 without output ∩ Ninth contactor KM9 without output. When the above conditions are met, the PLC automatically outputs the external power supply. The eighth contactor KM8 contactor is energized, and at this time, the vehicle load is powered by the external power supply.

[0079] (7) Output logic of automatic diesel generator set power supply (ninth contactor KM9):

[0080] Automatic mode ∩ Emergency power-off button not input ∩ AC circuit I not powered ∩ AC circuit II not powered ∩ DC circuit I not powered ∩ DC circuit II not powered ∩ External power supply not powered ∩ Diesel generator set power supply normal ∩ Ninth contactor KM9 contactor without fault ∩ Sensor without fault ∩ Seventh circuit breaker QF7 closed ∩ AC380V leakage detection without fault ∩ First contactor KM1 without output ∩ Second contactor KM2 without output ∩ Third contactor KM3 without output ∩ Fourth contactor KM4 without output ∩ Fifth contactor KM5 without output ∩ Sixth contactor KM6 without output ∩ Seventh contactor KM7 without output ∩ Eighth contactor KM8 without output. When the above conditions are met, the PLC automatically outputs the diesel generator set power supply. The ninth contactor KM9 contactor is energized, and at this time, the vehicle load is powered by the diesel generator set.

[0081] (8) Output logic of automatic battery pack power supply (first contactor KM1):

[0082] Automatic mode ∩ Emergency power-off button not input ∩ AC circuit I not powered ∩ AC circuit II not powered ∩ DC circuit I not powered ∩ DC circuit II not powered ∩ External power supply not powered ∩ Diesel generator set not powered ∩ Battery pack power supply normal ∩ First contactor KM1 contactor without fault ∩ Sensor without fault ∩ First circuit breaker QF1 closed ∩ DC600V leakage detection without fault ∩ Second contactor KM2 without output ∩ Third contactor KM3 without output ∩ Fourth contactor KM4 without output ∩ Fifth contactor KM5 without output ∩ Sixth contactor KM6 without output ∩ Seventh contactor KM7 without output ∩ Eighth contactor KM8 without output ∩ Ninth contactor KM9 without output. When the above conditions are met, the PLC automatically outputs the external power supply. The ninth contactor KM9 contactor is energized, and at this time, the vehicle load is powered by the battery pack through a DC600V / AC380V inverter.

[0083] Manual mode power supply control

[0084] (1) Output logic of manual AC power supply on Circuit I (Fourth Contactor KM4):

[0085] The mode selection switch is in the [Manual AC] position ∩ the AC power supply selection switch is in the [AC Circuit I] position ∩ the seventh contactor KM7 has no output ∩ the eighth contactor KM8 has no output ∩ the ninth contactor KM9 has no output. When the above conditions are met, the fourth contactor KM4 is energized, and at this time, the vehicle load is powered by AC Circuit I.

[0086] (2) Output logic of manual AC power supply on Circuit II (Seventh Contactor KM7):

[0087] The mode selection switch is in the [Manual AC] position ∩ the AC power supply selection switch is in the [AC Circuit II] position ∩ the fourth contactor KM4 has no output ∩ the eighth contactor KM8 has no output ∩ the ninth contactor KM9 has no output. When the above conditions are met, the seventh contactor KM7 is energized, and at this time, the vehicle load is powered by AC Circuit II.

[0088] (3) Output logic of manual DC power supply on Circuit I (Second Contactor KM2, Third Contactor KM3):

[0089] The mode selection switch is in the [Manual DC] position ∩ the DC power supply selection switch is in the [DC Circuit I] position ∩ the first contactor KM1 has no output ∩ the fifth contactor KM5 has no output. When the above conditions are met, the second contactor KM2 and the third contactor KM3 are energized, and at this time, the vehicle load is powered by DC Circuit I through a DC600V / AC380V inverter.

[0090] (4) Output logic of manual DC power supply on Circuit II (Fifth Contactor KM5, Sixth Contactor KM6):

[0091] The mode selection switch is in the [Manual DC] position ∩ the DC power supply selection switch is in the [DC Circuit II] position ∩ the first contactor KM1 has no output ∩ the second contactor KM2 has no output. When the above conditions are met, the fifth contactor KM5 and the sixth contactor KM6 are energized, and at this time, the vehicle load is powered by DC Circuit II through a DC600V / AC380V inverter.

[0092] (5) Output logic of external power supply (Eighth Contactor KM8):

[0093] The mode selection switch is in the [Manual AC] position ∩ the AC power supply selection switch is in the [External Power Supply] position ∩ the fourth contactor KM4 has no output ∩ the seventh contactor KM7 has no output ∩ the ninth contactor KM9 has no output. When the above conditions are met, the eighth contactor KM8 is energized, and at this time, the vehicle load is powered by the external power supply.

[0094] (6) Output logic of the diesel generator set power supply (the ninth contactor KM9):

[0095] The mode selection switch is in the [Manual AC] position ∩ the AC power supply selection switch is in the [Diesel Generator Set] position ∩ the fourth contactor KM4 has no output ∩ the seventh contactor KM7 has no output ∩ the eighth contactor KM8 has no output. When the above conditions are met, the ninth contactor KM9 is energized, and at this time, the diesel generator set supplies power to the vehicle load.

[0096] (7) Output logic of the battery pack power supply (the first contactor KM1):

[0097] The mode selection switch is in the [Manual DC] position ∩ the DC power supply selection switch is in the [Battery Pack] position ∩ the second contactor KM2 has no output ∩ the fifth contactor KM5 has no output. When the above conditions are met, the first contactor KM1 is energized, and at this time, the battery pack supplies power to the vehicle load through the DC600V / AC380V inverter.

[0098] Each embodiment in the present invention is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. The key point of each embodiment is to illustrate the differences from other embodiments.

[0099] The protection scope of the present invention is not limited to the above embodiments. Obviously, those skilled in the art can make various changes and deformations to the present invention without departing from the scope and spirit of the present invention. If these changes and deformations fall within the scope of the claims of the present invention and their equivalent technologies, the intention of the present invention also includes these changes and deformations.

Claims

1. A multi-power supply switching circuit for railway vehicles, characterized in that, It is used to switch and select the power supply among the battery pack, the vehicle-mounted DC power supply I, the vehicle-mounted DC power supply II, the vehicle-mounted AC power supply I, the vehicle-mounted AC power supply II, the external AC power supply and the generator set, including: The first power supply circuit is connected to the battery pack and the inverter. The inverter is used to convert the DC power supply of the battery pack into three-phase alternating current and drive the load. A voltage transmitter for detecting the output voltage of the battery pack, a circuit breaker for disconnecting the first power supply circuit, and a contactor for connecting the first power supply circuit are arranged on the first power supply circuit; The second power supply circuit is connected to the vehicle-mounted DC power supply I and the inverter. The inverter is used to convert the DC power supply of the vehicle-mounted DC power supply I into three-phase alternating current and drive the load. A voltage transmitter for detecting the output voltage of the vehicle-mounted DC power supply I, a circuit breaker for disconnecting the second power supply circuit, and a contactor for connecting the second power supply circuit are arranged on the second power supply circuit; The third power supply circuit is connected to the vehicle-mounted AC power supply I and the load. A judgment relay for judging whether there is alternating current output, a voltage transmitter for detecting the AC voltage value, a frequency transmitter for detecting the AC frequency value, a circuit breaker for disconnecting the third power supply circuit, and a contactor for connecting the third power supply circuit are arranged on the third power supply circuit; The fourth power supply circuit is connected to the vehicle-mounted DC power supply II and the inverter. The inverter is used to convert the DC power supply of the vehicle-mounted DC power supply II into three-phase alternating current and drive the load. A voltage transmitter for detecting the output voltage of the vehicle-mounted DC power supply II, a circuit breaker for disconnecting the fourth power supply circuit, and a contactor for connecting the fourth power supply circuit are arranged on the fourth power supply circuit; The fifth power supply circuit is connected to the vehicle-mounted AC power supply II and the load. A judgment relay for judging whether there is alternating current output, a voltage transmitter for detecting the AC voltage value, a frequency transmitter for detecting the AC frequency value, a circuit breaker for disconnecting the fifth power supply circuit, and a contactor for connecting the fifth power supply circuit are arranged on the fifth power supply circuit; The sixth power supply circuit is connected to the external AC power supply and the load. A judgment relay for judging whether there is alternating current output, a voltage transmitter for detecting the AC voltage value, a frequency transmitter for detecting the AC frequency value, a circuit breaker for disconnecting the sixth power supply circuit, and a contactor for connecting the sixth power supply circuit are arranged on the sixth power supply circuit; The seventh power supply circuit is connected to the generator set and the load. A judgment relay for judging whether there is alternating current output, a voltage transmitter for detecting the AC voltage value, a frequency transmitter for detecting the AC frequency value, a circuit breaker for disconnecting the seventh power supply circuit, and a contactor for connecting the seventh power supply circuit are arranged on the seventh power supply circuit.

2. The circuit according to claim 1, wherein It also includes: The first leakage detection device is used to detect the total DC leakage of all DC power supply circuits; The second leakage detection device is used to detect the total AC leakage current of all AC circuits; The emergency power-off button is used for emergency power-off of the load.

3. A control method for the multi-power supply switching circuit of the railway vehicle described in claim 1 or 2, characterized in that, Including: In the automatic mode, the priorities of the vehicle-end DC power supply I, vehicle-end DC power supply II, vehicle-end AC power supply I, and vehicle-end AC power supply II are the same and higher than that of the external AC power supply. The priority of the external AC power supply is higher than that of the generator set, and the priority of the generator set is higher than that of the battery pack; The priority judgment criteria for the vehicle-end DC power supply I and the vehicle-end DC power supply II include the sum of the vehicle number and the date of this vehicle; The priority judgment criteria for the vehicle-end AC power supply I and the vehicle-end AC power supply II include the sum of the vehicle number and the date of this vehicle; The vehicle-end DC power supply I and the vehicle-end DC power supply II are grouped together, and the vehicle-end AC power supply I and the vehicle-end AC power supply II are grouped together. The two groups do not supply power simultaneously.

4. The control method according to claim 3, characterized in that The multi-power supply switching circuit of the railway vehicle is the multi-power supply switching circuit of the railway vehicle described in claim 2. The control method specifically includes: In the automatic mode, when the following conditions are met: the emergency power-off button is not activated ∩ (the sum of the vehicle number and the date of this vehicle is odd ∪ (the sum of the vehicle number and the date of this vehicle is even ∩ the vehicle-end AC power supply II is not powered)), the vehicle-end AC power supply I is normal, the contactor on the third power supply circuit has no fault, the voltage transmitter and frequency transmitter on the third power supply circuit have no fault, the circuit breaker on the third power supply circuit, the second leakage detection device determines no leakage, and the contactors on the power supply circuits other than the third power supply circuit have no output, control the contactor on the third power supply circuit to close; In the automatic mode, when the following conditions are met: the emergency power-off button is not activated ∩ (the sum of the vehicle number and the date of this vehicle is even ∪ (the sum of the vehicle number and the date of this vehicle is odd ∩ the vehicle-end AC power supply I is not powered)), the vehicle-end AC power supply II is normal, the contactor on the fifth power supply circuit has no fault, the voltage transmitter and frequency transmitter on the fifth power supply circuit have no fault, the circuit breaker on the fifth power supply circuit, the second leakage detection device determines no leakage, and the contactors on the power supply circuits other than the fifth power supply circuit have no output, control the contactor on the fifth power supply circuit to close.

5. The control method according to claim 3, wherein The multi-power supply switching circuit of the railway vehicle is the multi-power supply switching circuit of the railway vehicle described in claim 2. The control method specifically includes: In the automatic mode, when the following conditions are met: the emergency power-off button is not activated ∩ (the sum of the vehicle number and the date of this vehicle is odd ∪ (the sum of the vehicle number and the date of this vehicle is even ∩ the vehicle-end AC power supply II is not powered)), the vehicle-end DC power supply I is normal, the contactor on the second power supply circuit has no fault, the voltage transmitter on the second power supply circuit has no fault, the circuit breaker on the second power supply circuit is closed, the first leakage detection device determines no leakage, and the contactors on the power supply circuits other than the second power supply circuit have no output, control the contactor on the second power supply circuit to close; In the automatic mode, when the emergency power-off button is not activated ∩ (the sum of the vehicle number and the date of this vehicle is even ∪ (the sum of the vehicle number and the date of this vehicle is odd ∩ the on-vehicle I-way AC power supply is not powered)), the on-vehicle II-way DC power supply is normal, the contactor on the fourth power supply circuit has no fault, the voltage transmitter on the fourth power supply circuit has no fault, the circuit breaker on the fourth power supply circuit is closed, the first leakage detection device determines no leakage, and the contactors on the power supply circuits other than the fourth power supply circuit have no output, control the contactor on the fourth power supply circuit to close.

6. The control method according to claim 3, characterized in that, The multi-power-supply switching circuit of the railway vehicle is the multi-power-supply switching circuit of the railway vehicle described in claim 2. The control method specifically includes: In the automatic mode, when the emergency power-off button is not activated ∩ the on-vehicle I-way DC power supply is not powered ∩ the on-vehicle II-way DC power supply is not powered ∩ the on-vehicle I-way AC power supply is not powered ∩ the on-vehicle II-way AC power supply is not powered ∩ the external AC power supply is normal, the contactor on the sixth power supply circuit has no fault, the voltage transmitter and frequency transmitter on the sixth power supply circuit have no fault, the circuit breaker on the sixth power supply circuit is closed, the second leakage detection device determines no leakage, and the contactors on the power supply circuits other than the sixth power supply circuit have no output, control the contactor on the sixth power supply circuit to close.

7. The control method according to claim 3, characterized in that The multi-power-supply switching circuit of the railway vehicle is the multi-power-supply switching circuit of the railway vehicle described in claim 2. The control method specifically includes: In the automatic mode, when the emergency power-off button is not activated ∩ the on-vehicle I-way DC power supply is not powered ∩ the on-vehicle II-way DC power supply is not powered ∩ the on-vehicle I-way AC power supply is not powered ∩ the on-vehicle II-way AC power supply is not powered ∩ the external AC power supply is not powered ∩ the generator set power supply is normal, the contactor on the seventh power supply circuit has no fault, the voltage transmitter and frequency transmitter on the seventh power supply circuit have no fault, the circuit breaker on the seventh power supply circuit is closed, the second leakage detection device determines no leakage, and the contactors on the power supply circuits other than the seventh power supply circuit have no output, control the contactor on the seventh power supply circuit to close.

8. The control method according to claim 3, wherein The multi-power-supply switching circuit of the railway vehicle is the multi-power-supply switching circuit of the railway vehicle described in claim 2. The control method specifically includes: In the automatic mode, when the emergency power-off button is not activated ∩ the on-vehicle I-way DC power supply is not powered ∩ the on-vehicle II-way DC power supply is not powered ∩ the on-vehicle I-way AC power supply is not powered ∩ the on-vehicle II-way AC power supply is not powered ∩ the external AC power supply is not powered ∩ the generator set is not powered ∩ the battery pack power supply is normal, the contactor on the first power supply circuit has no fault, the voltage transmitter on the first power supply circuit has no fault, the circuit breaker on the first power supply circuit is closed, the first leakage detection device determines no leakage, and the contactors on the power supply circuits other than the first power supply circuit have no output, control the contactor on the first power supply circuit to close.

9. The control method according to claim 3, wherein The multi-power supply switching circuit of the railway vehicle further includes a mode selection switch, an AC power supply selection switch, and a DC power supply selection switch. When the mode selection switch is set to the automatic gear, each contactor is under the control of the system controller and is in the automatic mode. When the mode selection switch is set to the manual gear, the contactors connecting each AC power supply are controlled by the AC power supply selection switch, and the contactors connecting each DC power supply are controlled by the DC power supply selection switch.

10. The control method according to claim 9, wherein All the contactors connecting the AC power supplies are controlled in a linked manner, and all the contactors connecting the DC power supplies are controlled in a linked manner.

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