A high-voltage power distribution system cooperatively controlled with a traction system test bench

Abstract

The application provides a high-voltage power distribution system cooperatively controlled with a traction system test bench, comprising: a high-voltage power distribution unit, a high-voltage cable interface device, a low-voltage power supply unit, a high-voltage power supply filter device, a high-voltage cable straight-through device, a host computer and the traction system test bench; the high-voltage power distribution unit and the low-voltage power supply unit are connected by a high-voltage shielded cable assembly for power supply by the traction system test bench; a high-voltage power supply filter device and a high-voltage cable straight-through device are arranged outside the high-voltage cable interface device; the high-voltage power distribution unit is connected with the high-voltage power supply filter device and the high-voltage cable straight-through device through the high-voltage shielded cable assembly for information transmission interaction; the host computer is electrically connected with the low-voltage power supply unit, and the low-voltage power supply unit comprises a PLC intelligent controller and a data acquisition module. The application aims to connect a converter power supply system and a load system, so that the converter simulates the working condition on the vehicle to perform electromagnetic compatibility test in a semi-electromagnetic wave darkroom.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of power supply of rail transit locomotive and vehicle traction system, in particular, relates to a high-voltage power distribution system cooperatively controlled with a traction system test bench. BACKGROUND

[0002] At present, the equipment of rail transit locomotive and vehicle develops rapidly, and the traction auxiliary converter as the power core component thereof has attracted extensive attention. In recent years, the converter tends to develop in the direction of high integration, intelligence and miniaturization, but the converter has high power density, multiple transmission lines and complex control logic, and multiple factors cause a complex electromagnetic environment, therefore, the electromagnetic compatibility performance test and research thereof have become a problem to be solved urgently.

[0003] At present, the electromagnetic compatibility test of the converter requires a high-voltage and high-current power distribution system for power supply and load, especially for simulating the actual working condition of the vehicle, and the laboratory lacks such conditions, therefore, the darkroom test of the converter under this working condition has been in a blank stage. The traction system test bench can provide power supply and load for the traction system including the converter, therefore, a high-voltage power distribution system can be arranged between the darkroom and the traction system test bench to introduce the power supply and load of the test bench into the darkroom. When the converter is tested in the darkroom, the interface and shielding effectiveness of the power distribution system need to be considered first, and it is ensured that the working requirements of the continuous load of the converter are met, and the power distribution control logic and safety interlocking functions of the transmission test bench should also be considered. The above requirements pose a challenge to the high-voltage power distribution system. SUMMARY

[0004] The application provides a high-voltage power distribution system for the cooperation control of key products of a rail transit traction system in a darkroom and a traction system test bench, to at least solve the problem that when the converter is tested in the darkroom, the interface and shielding effectiveness of the power distribution system need to be considered first, and it is ensured that the working requirements of the continuous load of the converter are met, and the power distribution control logic and safety interlocking functions of the transmission test bench should also be considered.

[0005] According to the scheme of the application, a high-voltage power distribution system cooperatively controlled with a traction system test bench is provided, comprising:

[0006] a high-voltage power distribution unit, a high-voltage cable interface device, a low-voltage power supply unit, a high-voltage power supply filter device, a high-voltage cable straight-through device, an upper computer and a traction system test bench;

[0007] The traction system test bench is connected to the high-voltage power distribution unit and the low-voltage power supply unit through a high-voltage shielding cable assembly to transmit and interact information;

[0008] A high-voltage power supply filter device and a high-voltage cable straight-through device are arranged outside the high-voltage cable interface device;

[0009] The high-voltage distribution unit is connected with the high-voltage power supply filtering device and the high-voltage cable straight-through device through the high-voltage shielding cable assembly to transmit information and interact.

[0010] The upper computer is electrically connected with the low-voltage power supply unit, and the low-voltage power supply unit includes a PLC intelligent controller and a data acquisition module.

[0011] In an embodiment, the high-voltage distribution unit includes an AC 25kV high-voltage input switch cabinet, an AC 4kV high-voltage input switch cabinet, a DC 4kV high-voltage input switch cabinet, an AC 4kV high-voltage output switch cabinet, and an AC 380V output switch cabinet. The high-voltage distribution unit receives control signals of the PLC intelligent controller to realize closing and opening operations of high-voltage relays.

[0012] In an embodiment, the data acquisition module acquires voltage and current signals on all input and output circuits, and transmits the signals to the PLC intelligent controller for processing after operation. The data acquisition module includes a data acquisition device and a voltage / current sensor.

[0013] In an embodiment, one end of the high-voltage distribution unit is connected with a power supply unit and a load system of a traction system test bench, and the other end is connected with a converter through a high-voltage cable interface device to provide power supply and load for the converter.

[0014] In an embodiment, the high-voltage cable interface device includes a darkroom turntable, and a user interface device is arranged on the darkroom turntable and electrically connected with high-voltage input switching boxes of different specifications.

[0015] In an embodiment, a safety protection device is further included, and the safety protection device is connected with the PLC intelligent controller. The PLC intelligent controller acquires states of the safety protection device in real time, and completes self-locking or opening of a power supply circuit when the states are abnormal.

[0016] In an embodiment, the high-voltage power supply filtering device is used to shield electromagnetic interference signals outside a darkroom to prevent external interference signals from entering the inside of the darkroom through a conduction mode. The high-voltage power supply filtering device is applied to the following circuits: an AC 25kV high-voltage input circuit, a DC 4kV high-voltage input circuit, and an AC 380V output circuit.

[0017] In an embodiment, power supply voltages of the low-voltage power supply unit include AC 220V and DC 24V.

[0018] In an embodiment, the high-voltage cable straight-through device is used to pass cables from the outside through a shielding shell of a radio darkroom without affecting shielding effectiveness of the shielding shell.

[0019] In one embodiment, the high-voltage straight-through device is used to inject metal particles into the device after the cable is laid, completely seal the space between the cables, and configure a non-porous cover plate to ensure the shielding effect.

[0020] The application aims to connect the converter power supply system and the load system, so that the converter simulates the on-vehicle working condition for test and test. The intelligent control and safety interlocking mechanism are designed, and the converter should also ensure to reduce the external electromagnetic interference when it is tested in the dark room. The filter and the grounding loop are designed and installed, and on this basis, the accuracy of the test and test results is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 The overall structure schematic diagram of a preferred embodiment of the high-voltage power distribution system provided in the present application is shown.

[0023] Figure 2 The working principle diagram of the data acquisition module in the present application is shown.

[0024] Figure 3 The electrical system principle diagram of the high-voltage power distribution system in the present application is shown.

[0025] Figure 4 The working principle diagram of the PLC intelligent controller of the present application is shown.

[0026] Figure 5 The external interface layout of the 8m turntable in the present application is shown.

[0027] Figure 6 The working flow chart of the PLC intelligent controller in the present application is shown.

[0028] Figure 7 The safety protection structure diagram in the present application is shown. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0030] In order to solve the problems in the background art, the application provides a high-voltage power distribution system cooperatively controlled with a traction system test bench, comprising:

[0031] a high-voltage power distribution unit, a high-voltage cable interface device, a low-voltage power supply unit, a high-voltage power supply filtering device, a high-voltage cable straight-through device, a host computer and a traction system test bench;

[0032] The traction system test bench is connected with the high-voltage power distribution unit and the low-voltage power supply unit through a high-voltage shielded cable assembly for information transmission interaction;

[0033] A high-voltage power supply filtering device and a high-voltage cable straight-through device are arranged outside the high-voltage cable interface device;

[0034] The high-voltage power distribution unit is connected with the high-voltage power supply filtering device and the high-voltage cable straight-through device through the high-voltage shielded cable assembly for information transmission interaction;

[0035] The host computer is electrically connected with the low-voltage power supply unit, and the low-voltage power supply unit comprises a PLC intelligent controller and a data acquisition module.

[0036] In a specific embodiment, the high-voltage shielded cable is used for power supply and load use of the converter, and the power supply and the load are provided by the traction system test bench. The high-voltage shielded cable passes through the high-voltage power distribution unit, the high-voltage power supply filtering unit, the adapter box and other devices, is connected to the user interface board of the turntable, and is finally connected to the converter through the cable.

[0037] In an embodiment, the high-voltage power distribution unit comprises an AC 25kV high-voltage input switching cabinet, an AC 4kV high-voltage input switching cabinet, a DC 4kV high-voltage input switching cabinet, an AC 4kV high-voltage output switching cabinet and an AC 380V output switching cabinet. The high-voltage power distribution unit receives the control signal of the PLC intelligent controller to realize the closing and opening operation of the high-voltage relay.

[0038] In a specific embodiment, the AC 25kV high-voltage input switching cabinet supplies AC 17.5kV-31kV single-phase alternating current, and the power supply loop comprises a straight-through loop and a filtering loop, which meets the test requirements of the integrated converter for future 25kV power supply. The AC 4kV high-voltage input switching cabinet comprises two groups of power supply units, each group of power supply unit comprises two modes, including AC 1.9kV and AC 0.95kV, which meets the use requirements of the AC power supply on-board converter. The DC 4kV high-voltage input switching cabinet can realize 0V-4kV adjustable DC power supply, which meets the use requirements of the city rail converter for DC power supply. The AC 4kV high-voltage output switching cabinet comprises four groups of power supply units, each group of three-phase output is connected to four motor loads, and the power supply range is 0V-2.8kV. The AC 380V output switching cabinet supports three-phase load, connects the auxiliary output of the converter to the auxiliary load of the traction system test bench, and simulates the 380V power environment on the vehicle.

[0039] In an embodiment, the data acquisition module acquires voltage and current signals on all input and output circuits, and transmits the PLC intelligent controller after operation for processing; the data acquisition module includes a data acquisition device and a voltage / current sensor.

[0040] Specifically, the control hub of the high-voltage power distribution system is a PLC intelligent controller, which supports different circuit power distribution control, including AC 25kV input circuit, AC 4kV input circuit, DC 4kV input circuit, AC 4kV output circuit, and AC 380V output circuit. The data acquisition module acquires voltage / current information of the input and output circuits in real time, transmits the PLC control unit, and the PLC acquires data through data processing and intelligent control, and transmits the data to the upper computer or starts the protection program. The PLC control unit interacts with the traction system test bench to achieve cooperative control, closes the corresponding circuit after meeting the closing permission condition, and disconnects the power supply circuit under overload conditions during the test to protect the test equipment and the test sample. The PLC control unit acquires the state of the safety protection device in real time, and completes self-locking or disconnects the power supply circuit when the state is abnormal.

[0041] In an embodiment, one end of the high-voltage power distribution unit is connected to the power supply unit and the load system of the traction system test bench, and the other end is connected to the converter through the high-voltage cable interface device to provide power supply and load for the converter.

[0042] In a specific embodiment, the high-voltage power distribution unit includes but is not limited to a DC high-voltage vacuum circuit breaker, a high-voltage vacuum contactor, a high-voltage live display, a high-voltage insulator, and a high-voltage connector. The high-voltage cable interface device includes an AC 25kV high-voltage input switching box, an AC 4kV high-voltage input switching box, a DC 4kV high-voltage input switching box, an AC 4kV high-voltage output switching box, and an AC 380V output switching box.

[0043] In an embodiment, the high-voltage cable interface device includes a darkroom turntable, and a user interface device is arranged on the darkroom turntable and electrically connected to high-voltage input switching boxes of different specifications.

[0044] In a specific embodiment, the high-voltage cable interface device is used for the transfer connection between the high-voltage power distribution unit and the test sample on the darkroom turntable, and the high-voltage cable interface device includes an AC 25kV high-voltage input switching box, an AC 4kV high-voltage input switching box, a DC 4kV high-voltage input switching box, an AC 4kV high-voltage output switching box, and an AC 380V output switching box.

[0045] In an embodiment, a safety protection device is further included, which is connected to the PLC intelligent controller, and the PLC intelligent controller acquires the state of the safety protection device in real time and completes self-locking or disconnects the power supply circuit when the state is abnormal.

[0046] In a specific embodiment, the safety protection device is controlled by the PLC controller to realize overload protection, live-line protection and power-off protection. In addition, the safety protection device also includes the grounding loop design of the high-voltage power distribution system. The safety protection device implements three modes of emergency stop, overload power-off and power-off self-locking. When the converter is in an abnormal state, the power supply equipment can be disconnected by using the emergency stop. When the converter is overloaded, the data acquisition module collects the power supply loop state and transmits it to the PLC controller, which judges in time and feeds back to the upper computer and disconnects the knife switch to protect the equipment. Power-off self-locking means that when the test product is not powered, the high-voltage input switching cabinet, high-voltage cable interface device, rotary table user interface device and other equipment are in a self-locking state, and the cabinet door cannot be opened. When the PLC is powered, the PLC judges in a safe state and releases the cabinet door self-locking.

[0047] Specifically, the grounding loop of the safety protection device adopts a composite grounding mode. The high-voltage loop and the control loop are separately grounded, and finally unified grounded. The high-voltage loop grounding is divided into dark room external grounding and dark room internal grounding. The dark room external grounding refers to the high-voltage cable connected between the high-voltage power distribution system and the traction system test bench, which uses the same ground loop to connect the ground loop of the traction system test bench. The dark room internal grounding refers to the high-voltage switching cabinet, transfer box and high-voltage cable inside the dark room and other equipment of the high-voltage power distribution system, which all use dark room grounding. The control loop grounding refers to the separate grounding of PLC controllers and other related equipment, which are then connected to the dark room ground after being collected. In this way, a smaller grounding loop is formed to reduce the influence of electromagnetic interference. At the same time, the high-voltage cable uses shielded cable and is grounded nearby to reduce the influence of external electromagnetic interference.

[0048] Specifically, the safety protection measures also include the life statistics of the knife switch in the high-voltage switching cabinet. Each time the knife switch is closed, the PLC controller counts once. When the number of switch times of the knife switch reaches the set value of the contactor / circuit breaker, the PLC controller prohibits closing and pops up a warning interface through the upper computer.

[0049] In an embodiment, the high-voltage power supply filtering device is used to shield the electromagnetic interference signals outside the dark room to prevent external interference signals from entering the dark room through conduction. The high-voltage power supply filtering device is applied to the following loops: AC 25kV high-voltage input loop, DC 4kV high-voltage input loop and AC 380V output loop.

[0050] In an embodiment, the power supply voltage of the low-voltage power supply unit includes AC 220V and DC 24V.

[0051] In a specific embodiment, the low-voltage power supply unit supplies power to the PLC controller, data acquisition module, electromagnetic lock and voltage / current sensor and other equipment. The power supply voltage includes AC 220V and DC 24V. DC 24V is obtained by converting AC 220V through the power supply module.

[0052] In an embodiment, the high-voltage cable through device is used when the cable passes through the shielded shell of the anechoic chamber from the outside, without affecting the shielding effectiveness of the shielded shell.

[0053] In an embodiment, the high-voltage through device is used after the cable is laid, the metal particles are injected into the device, the space between the cables is completely sealed, and the non-porous cover plate is configured to ensure the shielding effect.

[0054] In a specific embodiment, the high-voltage power supply filtering device and the high-voltage cable through device correspond to different power distribution circuits, respectively, because the four-quadrant rectification input and the inverter output of the converter use pulse width modulation (PWM) signals, and the use of filters will cause waveform distortion, so the high-voltage cable through device is selected for the AC 4kV high-voltage input circuit and the AC 4kV high-voltage output circuit. In addition, the high-voltage cable through device can also be selected for other remaining circuits.

[0055] In the present application, the upper computer is located in the control room of the electromagnetic compatibility laboratory, communicates with the PLC intelligent control unit, sends the opening and closing instructions of the contactor and circuit breaker, reads the actual state, and at the same time transmits instructions to the PLC control unit, interacts with the signal of the traction system test bench, and cooperates to realize the control of the high-voltage power distribution system. In addition, the upper computer displays the sensor information collected by each circuit in real time, assists in judging the state of the converter, and provides a reference basis for test and test. The high-voltage power distribution system also includes an external user interface located on the turntable in the anechoic chamber, which is used to support the connection of the high-voltage power distribution system and the converter in the anechoic chamber, and then perform electromagnetic compatibility tests in the anechoic chamber to test the electromagnetic interference performance.

[0056] The hardware configuration is shown in Figure 1 , Figure 2 and Figure 4 , which includes a high-voltage switching cabinet 1, high-voltage shielded cables 2-3, 11, high-voltage input / output adapter boxes 6-10, high-voltage input / output switching cabinets 18-22, high-voltage power supply filtering devices 5, high-voltage cable through devices 4, PLC intelligent controllers and data acquisition modules 13, upper computers 14, turntable user interface devices 12, safety protection devices 35, and other equipment.

[0057] Specifically, Figure 1In the embodiment, the high-voltage distribution unit is composed of a high-voltage switch cabinet 1, which includes an AC 25kV high-voltage input switch cabinet 18, an AC 4kV high-voltage input switch cabinet 19, a DC 4kV high-voltage input switch cabinet 20, an AC 4kV high-voltage output switch cabinet 21 and an AC 380V output switch cabinet 22. The main function is to switch the power supply circuit and load circuit of the converter, the power supply circuit provides power for the converter, the input circuit includes three kinds of AC 25kV input circuit, AC 4kV input circuit and DC 4kV input circuit; the output of the converter is connected to the load circuit, including traction motor load and auxiliary output load, the output circuit includes AC 4kV output circuit and AC 380V output circuit. The AC 25kV input circuit is controlled by the AC 25kV high-voltage input switch cabinet 18, the AC 4kV input circuit is controlled by the AC 4kV high-voltage input switch cabinet 19, the DC 4kV input circuit is controlled by the DC 4kV high-voltage input switch cabinet 20, the AC 4kV output circuit is controlled by the AC 4kV high-voltage output switch cabinet 21, and the AC 380V output circuit is controlled by the AC 380V output switch cabinet 22.

[0058] Specifically, Figure 1 In the embodiment, the electromagnetic compatibility laboratory semi-electric wave darkroom 17 mainly carries out electromagnetic interference and immunity test, and the test equipment includes antennas, power amplifiers, control units, receivers, signal generators, immunity testers and other equipment. The semi-electric wave darkroom 8m turntable 27 is located inside the darkroom 17, and the converter is placed on the 8m turntable 17 through supporting tooling. The semi-electric wave darkroom 17 underground includes an AC 25kV high-voltage input transfer box 6, an AC 4kV high-voltage input transfer box 7, a DC 4kV high-voltage input transfer box 8, an AC 4kV high-voltage output transfer box 9, an AC 380V output transfer box 10 and a high-voltage cable transfer box to the high-voltage shielding cable assembly 11 of the darkroom turntable.

[0059] Specifically, Figure 1In the traction system test platform 16, the power supply unit 23, the motor load 24, the auxiliary output load 25, and the control unit 26 are included. The power supply unit 23 includes AC 25kV, AC 4kV, and DC 4kV, and the three modes are powered separately. In order to simulate the on-board environment, the AC 25kV power supply range is 17.5kV-31kV, the rated working voltage is 25kV, and the rated current is 150A. The AC 4kV power supply unit includes three gears, which are AC 970V, AC 1.5kV, and AC 1.9kV, respectively, and meets the power supply requirements of two specifications of standard EMU 250 converter and standard EMU 350 converter. The DC 4kV power supply unit provides a 0-4kV adjustable DC power supply, which provides DC power supply for city rail converter, high-speed auxiliary converter, etc. The motor load 24 supports the use of four traction motors, which are combined to form three control modes of car control, frame control, and axle control. According to the different load power of the converter, motors with specifications such as 350kW and 650kW can be selected. The auxiliary output load 26 provides a resistance and inductance load for the auxiliary output of the converter, which meets the current power requirements of the auxiliary output of the converter.

[0060] Specifically, Figure 1 In the high-voltage cable straight-through device 4, metal particles are injected inside, and a non-porous cover plate is configured to ensure cable sealing and shielding effect; the high-voltage power supply filtering device 5 is used to filter out high-frequency interference signals on the cable, and at the same time, the cable shielding layer is connected to the case ground of the high-voltage power supply filtering device 5, further reducing external interference; because the four-quadrant input of the converter and the inverter output contain high-frequency signals, the signal is easy to distort after adding the filtering device, so the two circuits do not add the filtering device.

[0061] Specifically, Figure 1 In addition, the PLC intelligent controller and the data acquisition module 13 are also included, which are placed inside the AC 380V output switching cabinet 22, and the main function is to cooperate with the control unit 26 of the traction system test platform to control and signal interaction, realize the loop selection of the high-voltage switching cabinet 1, and monitor the loop state in real time, to ensure the safety and normal operation of the test.

[0062] Specifically, the high-voltage input switching cabinet is powered by the power supply unit 23 of the traction system test platform, and is connected through the high-voltage power distribution system to the high-voltage shielding cable assembly 2 of the traction system test platform. The other end of the high-voltage input switching cabinet is connected to the high-voltage cable straight-through device 4 or the high-voltage power supply filtering device 5. The input loop can select the high-voltage cable straight-through device 4, and at the same time, the high-voltage power supply filtering device 5 is connected to the high-voltage cable shielding layer, which can further reduce the external interference. Figure 3As shown, the AC 25kV input circuit and the DC 4kV input circuit can also select the high-voltage power supply filter device 5; after the input circuit passes through the straight-through device 4 / filter device 5, it passes through the high-voltage input transfer box 6-8 and is finally connected to the user interface device 12 on the darkroom turntable. The output circuit of the high-voltage power distribution system is connected to the high-voltage cable straight-through device 4 / high-voltage power supply filter device 5 through the user interface device 12 and the high-voltage output transfer box 9-10. The output circuit can also select the high-voltage cable straight-through device 4, and as shown, Figure 3 As shown, the AC 380V output circuit can also select the high-voltage power supply filter device 5; it is connected to the AC 4kV high-voltage output switch cabinet 21 and the AC 380V output switch cabinet 22 again through the high-voltage shielded cable 3, and finally connected to the traction system test bench motor load 24 and the traction system test bench auxiliary output load 25 through the high-voltage shielded cable 2.

[0063] Specifically, the user interface device 12 is as shown in Figure 5 CP1 is located at the center of the turntable, and CP2-CP9 are placed on one side of the center of the turntable, so that the other end of the CP plate can be selected during the running of the converter, avoiding the CP plate from bearing weight, and at the same time, it is also helpful for the wiring of the converter cable and reduces the influence of electromagnetic interference; in combination with Figure 3 , the CP plate corresponds to different high-voltage circuits, CP1-CP4 are high-voltage input circuits, and CP5-CP9 correspond to output circuits.

[0064] Specifically, Figure 2 is the working principle diagram of the data acquisition module 33. When the high-voltage power distribution system is working normally, the data acquisition module 33 acquires the state of the circuit on the high-voltage switch cabinet 28-32 in real time, measures the voltage / current on the circuit, and transmits it to the PLC controller 34. The controller 34 processes the data in real time and displays the measured value on the circuit on the host computer. In combination with Figure 4 , the PLC intelligent working principle diagram, the PLC controller 34 not only receives the data of the data acquisition module 33, but also monitors the state of the contactor group 36. When the contactor does not act normally, it timely feedbacks the state and takes corresponding measures.

[0065] Specifically, Figure 3is the electrical schematic diagram of the high-voltage power distribution system. The electrical circuit passes through the high-voltage transfer box and the CP board, and is connected with the input / output end of the converter through the extension cable, to form a closed loop. The input circuit includes three groups, AC 25kV input circuit, AC 4kV input circuit and DC 4kV input circuit. The AC 4kV input circuit includes two groups, corresponding to two groups of rectifier modules of the converter. Among the three input circuits, only one circuit can supply power at a time. The output end of the converter is connected with five circuits, which are four traction motor output circuits and one auxiliary output circuit. The output circuit supports testing the electromagnetic compatibility characteristics of the converter under simulated special conditions (for example, the converter running with three motors).

[0066] Specifically, Figure 4 is the working principle diagram of the PLC intelligent controller, which mainly includes five parts of work, which are respectively the signal interaction between the PLC controller 34 and the upper computer 14, the traction system test bench control unit 26, the real-time processing of the data of the data acquisition module 33, the monitoring and control of the state of the safety protection device 35 and the contactor group 36, and the guarantee of the normal and safe operation of the high-voltage power distribution system.

[0067] Specifically, Figure 4 Among them, the PLC controller 34 communicates with the upper computer 14 in real time, sends the signals such as the monitoring of the contactor state and the closed knife switch state of the traction system test bench to the upper computer and displays, the upper computer 14 sends instructions to the PLC controller 34 according to the closed loop, the running state of the high-voltage power distribution system and other information, and the PLC controller 34 takes corresponding actions according to the instructions.

[0068] Specifically, Figure 4 Among them, the PLC controller 34 and the traction system test bench control unit 26 interact with each other. The PLC controller 34 reads the traction system test bench knife switch state, network voltage signal and other information, and feeds back the high-voltage switch cabinet knife switch closed state, allows the closing instruction and other information to the traction system test bench control unit 26. After the two parties confirm that there is no error, the closing power supply is carried out. The specific process is shown in Figure 6 .

[0069] Specifically, Figure 6is a work flow chart of the PLC intelligent controller, reflecting the operation process during the test of the high-voltage power distribution system. After the test starts, the high-voltage power distribution system is started, and the network communication is normally established. Before the test, it is necessary to confirm that the contactor is in a normal state, the switch does not malfunction, and the doors of the high-voltage switching cabinet 1, the user interface board CP1-CP9, the high-voltage switching box 6-10 and other equipment cabinets are closed, and no one is close to the electrical equipment. After confirming the above operations, the test loop is determined, the upper computer sends a signal to the PLC controller 34, and feeds back to the traction system test bench control unit 26. The traction system test bench 16 closes the corresponding loop according to the feedback signal and feeds back to the PLC controller 34. The control unit sends a closing permission instruction after confirming the state. The traction system test bench control unit 26 closes the power supply after confirming the closing signal. The PLC controller confirms the power supply of the traction system test bench, closes the corresponding loop knife switch of the high-voltage switching cabinet 1, and the converter is powered on. During the test, the PLC controller 34 monitors the running state of the loop in real time. When the signal jumps or overloads, the high-voltage power distribution system disconnects the knife switch to protect the electrical equipment. After the test is completed, the traction system test bench is powered off, and the closing permission signal is disconnected in turn, and the test loop is cancelled.

[0070] Specifically, during the operation of the high-voltage power distribution system, the necessary condition for the closing permission signal of the control unit is that the traction system test bench control unit 26 sends a network voltage signal. The control unit sends a closing permission signal after receiving the network voltage signal, but the closing permission signal failure is not based on the network voltage signal. This is to ensure that the high-voltage switching cabinet 1 knife switch does not act during the network voltage interruption test, and does not affect the test implementation.

[0071] Specifically, during the operation of the high-voltage power distribution system, the AC4kV input loop 1 and the AC4kV input loop 2 support separate power supply or common power supply. This meets the test when the converter starts only one four-quadrant.

[0072] Specifically, the PLC controller 34 monitors the running state of the safety protection device 35, and takes corresponding protection logic according to different operating conditions. The safety protection device 35 not only includes hardware devices such as cabinet door lock and travel switch, but also includes overload protection, loop state monitoring and other contents.

[0073] Specifically, the safety protection function is as shown in Figure 7 The safety monitoring includes three aspects: PLC controller 34 and traction system test bench signal interaction monitoring, upper computer 14 and power supply loop state monitoring, and PLC controller 34 and cabinet door state monitoring.

[0074] Specifically, in Figure 7In the middle, PLC controller 34 interacts with the traction system test bench signal, first, the power supply circuit should be confirmed, when the loop selection is incorrect, the feedback signal is inconsistent with the command, and the closing permission signal cannot be activated. Secondly, confirm the running state of the traction system test bench, including the feedback signal of the corresponding loop closing closed, and the input and output circuit power running, when abnormal state occurs during running, the traction system test bench feedback signal is abnormal, and the PLC controller 34 disconnects the power supply circuit. Finally, the PLC controller 34 monitors the darkroom closing condition, including the correct selection of the traction system test bench loop, the normal closing feedback signal of the knife switch, the normal network voltage signal, the normal darkroom closing permission signal, and the normal high voltage switch cabinet 1 knife switch closing. When the above conditions are met, the high voltage power distribution system can run normally, and the related electromagnetic compatibility test can be carried out.

[0075] Specifically, in Figure 7 In the middle, the power supply circuit monitoring needs to display the power supply circuit state through the host computer window and take relevant measures. First, when any loop runs abnormally or the PLC controller 34 communication is abnormal, record the input and output loop running state at the time of failure, and accurately locate or narrow down the troubleshooting range for subsequent troubleshooting. Secondly, when the darkroom power supply circuit is overloaded, the PLC controller 34 determines that the allowed limit is exceeded, and the corresponding knife switch is disconnected and the staff is prompted through the host computer. Thirdly, the control unit monitors the knife switch state, the feedback signal should be consistent with the command, and the number of times the knife switch is used is recorded, and when it exceeds the designed life, the closing is prohibited, and the staff is prompted through the host computer to prevent excessive use of equipment causing injury.

[0076] Specifically, Figure 7 In the middle, the PLC controller 34 monitors the cabinet door state, including the high voltage switch cabinet 1, the high voltage adapter box, the user interface device CP1-CP9, and other safety door locks and the like. During the test, the above-mentioned cabinet doors are self-locked and cannot be opened to protect the staff. At the same time, before the control power, the door lock is also in a self-locking state to prevent the risk of electric shock caused by mistakenly opening the cabinet door when the traction system test bench is powered.

[0077] Specifically, the safety protection device further includes an emergency stop button, which can timely disconnect the knife switch when the staff finds that the converter runs abnormally or uncontrollable factors appear, so as to avoid personal and equipment damage.

[0078] Based on Figures 1 to 4 the hardware configuration, the high voltage power distribution system proposed in the application supports the electromagnetic compatibility test of the converter in the darkroom in the following modes, specifically as follows:

[0079] Mode one, suitable for EMU, locomotive traction auxiliary converter. Converter is placed in the dark room turntable, rectifier input connection AC4kV input loop of high voltage power distribution system, inverter output connection AC4kV output loop, auxiliary output of converter connection AC380V output loop. Access loop default is straight through mode, AC380V output loop can choose straight through mode, filter mode two.

[0080] Mode two, suitable for EMU, locomotive traction converter. Converter is placed in the dark room turntable, rectifier input connection AC4kV input loop, inverter output connection AC4kV output loop. Access loop default is straight through mode.

[0081] Mode three, suitable for urban rail traction converter. Converter is placed in the dark room turntable, input end and DC4kV input loop of high voltage power distribution system are connected, inverter and AC4kV output loop are connected. Access loop default is straight through mode, DC4kV input loop can choose straight through mode, filter mode two.

[0082] Mode four, suitable for EMU, urban rail auxiliary converter. Converter is placed in the dark room turntable, input end and DC4kV input loop of high voltage power distribution system are connected, auxiliary output end and AC380V output loop are connected. Access loop default is straight through mode, DC4kV input loop, AC380V output loop can choose straight through mode, filter mode two.

[0083] Mode five, suitable for dual mode power supply traction auxiliary converter. Dual mode converter refers to the converter which can be powered by AC and DC. AC input end of converter and AC4kV input loop are connected, DC output end and DC4kV input loop are connected, inverter output end and AC4kV output loop are connected, auxiliary output and AC380V output loop are connected. Access loop default is straight through mode, DC4kV input loop, AC380V output loop can choose straight through mode, filter mode two.

[0084] Mode six, suitable for future AC25kV power integrated converter. Input end of converter and AC25kV input loop of high voltage power distribution system are connected, inverter output end and AC4kV output loop are connected, auxiliary output end and AC380V output loop are connected. Access loop default is straight through mode, AC25kV input loop, DC4kV input loop, auxiliary output loop can choose straight through mode, filter mode two.

[0085] In summary, high voltage power distribution system meets all the power supply mode of current converter products, provides feasible test conditions for converter testing in dark room.

[0086] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each of the embodiments focuses on the difference from other embodiments.

[0087] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the specification.

[0088] In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction. The above is only an embodiment of the embodiments of the specification and is not used to limit the embodiments of the specification. The embodiments of the specification can have various changes and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the embodiments of the specification shall be included in the scope of claims of the embodiments of the specification.

Claims

1. A high voltage power distribution system for coordinated control with a traction system test bed, characterized by, The utility model relates to a high-voltage power distribution unit, a high-voltage cable interface device, a low-voltage power supply unit, a high-voltage power supply filter device, a high-voltage cable straight-through device, a host computer and a traction system test bench. The traction system test bench is connected to the high-voltage power distribution unit and the low-voltage power supply unit through a high-voltage shielded cable assembly for power supply. A high-voltage power supply filter device and a high-voltage cable straight-through device are arranged outside the high-voltage cable interface device. The high-voltage power distribution unit is connected to the high-voltage power supply filter device and the high-voltage cable straight-through device through a high-voltage shielded cable assembly for information transmission and interaction. The host computer is electrically connected to the low-voltage power supply unit, which includes a PLC intelligent controller and a data acquisition module. The high-voltage power distribution unit includes an AC 25kV high-voltage input switch cabinet, an AC 4kV high-voltage input switch cabinet, a DC 4kV high-voltage input switch cabinet, an AC 4kV high-voltage output switch cabinet and an AC 380V output switch cabinet. The high-voltage power distribution unit receives control signals from the PLC intelligent controller to realize the closing and opening operations of high-voltage relays. The high-voltage power supply filter device is used to shield electromagnetic interference signals outside the darkroom, prevent external interference signals from entering the darkroom through conduction, and is applied to AC 25kV high-voltage input circuits, DC 4kV high-voltage input circuits and AC 380V output circuits. The high-voltage cable straight-through device is used to allow cables to pass through the shielded shell of the darkroom without affecting the shielding effectiveness of the shielded shell. The data acquisition module acquires voltage and current signals on all input and output circuits, transmits them to the PLC intelligent controller for processing after operation. The data acquisition module includes a data acquisition device and a voltage / current sensor.

2. The high voltage electrical distribution system of claim 1, wherein, One end of the high-voltage power distribution unit is connected to the power supply unit and the load system of the traction system test bench, and the other end is connected to the converter through the high-voltage cable interface device to provide power supply and load for the converter.

3. The high voltage electrical distribution system of claim 1, wherein, The high-voltage cable interface device includes a darkroom turntable, and a user interface device is arranged on the darkroom turntable. The user interface device is electrically connected to high-voltage input switch boxes of different specifications.

4. The high voltage electrical distribution system of claim 1, wherein, A safety protection device is also included, which is connected to the PLC intelligent controller. The PLC intelligent controller acquires the state of the safety protection device in real time and completes self-locking or disconnecting the power supply circuit when the state is abnormal.

5. The high voltage electrical distribution system of claim 1, wherein, The power supply voltage of the low-voltage power supply unit includes AC 220V and DC 24V.

6. The high voltage electrical distribution system of claim 4, wherein, After the cable is laid, the high-voltage cable straight-through device is used in the metal particle injection device to completely seal the space between the cables and configure a non-porous cover plate to ensure the shielding effect.

7. The high voltage electrical distribution system of claim 4, wherein, ​

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