Offline detection equipment for power modules of rail transit vehicle auxiliary power supply system

Abstract

The utility model discloses an off-line detection device for a power module of a rail transit vehicle-mounted auxiliary power supply system, comprising: a power supply device, a load device, and a control device; the power supply device comprises: a voltage source, a contactor, a voltage sensor, and a current sensor, which are used to provide voltage for the power module under test, collect corresponding voltage and current values ​​in real time, and send them to the control device; the load device comprises: a contactor, a voltage sensor, a current sensor, and a load, which are used to collect corresponding voltage and current values ​​in real time, and send them to the control device; the control device is used to control the on and off of the corresponding contactor, send SVPWM signals to the power electronic devices of the power module under test, and adjust the duty cycle of the SVPWM signal in real time according to the voltage and current values, and control the power module under test to stably output three-phase alternating current. The utility model can perform off-line comprehensive detection for the power module under test, with high detection efficiency and good detection effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of rail transit subway detection, and in particular relates to an off-line detection device for a power module of an on-board auxiliary power supply system of a rail transit. Background Art

[0002] The three core systems of urban rail transit subway are traction system, auxiliary system and network system. The main function of the traction system is to convert the 1500V DC power of the contact network into voltage and frequency adjustable (VVVF) AC power through pulse width modulation (PWM) when the train is being pulled, and supply power to the three-phase AC motor, thereby realizing the control of the train running speed; the auxiliary system mainly provides working power for all other equipment of the train except the traction motor, such as 380VAC required by air conditioners and air compressors, 220VAC required by lighting, video and other systems, and 110VDC power required by other 110VDC equipment.

[0003] As the number of subway trains increases and their operating years increase, the number of trains entering overhaul is growing. Offline detection equipment for power modules of rail transit vehicle auxiliary power supply systems has been in short supply. Utility Model Content

[0004] In order to solve the above technical problems, the utility model proposes an off-line detection device for a power module of an auxiliary power supply system on a rail transit vehicle.

[0005] In order to achieve the above object, the technical solution of the utility model is as follows:

[0006] The utility model discloses an off-line detection device for a power module of a rail transit vehicle-mounted auxiliary power supply system. The off-line detection device is used to perform off-line detection on the power module to be tested. The power module to be tested is a three-phase inverter bridge circuit.

[0007] Offline testing equipment includes:

[0008] A power supply device, the power supply device includes: a voltage source, a plurality of contactors, a plurality of voltage sensors and a plurality of current sensors. The power supply device is electrically connected to the input end of the power module under test, and is used to provide voltage to the power module under test, collect corresponding voltage and current values ​​in real time, and send them to the control device;

[0009] A load device, the load device includes: a plurality of contactors, a plurality of voltage sensors, a plurality of current sensors and a plurality of loads, the load device is electrically connected to the output end of the power module under test, and is used to collect corresponding voltage and current values ​​in real time and send them to the control device;

[0010] The control device is used to control the on and off of the corresponding contactor, send SVPWM signals to the power electronic devices of the power module under test, and adjust the duty cycle of the SVPWM signal in real time according to the voltage and current values ​​to control the power module under test to stably output three-phase alternating current.

[0011] Based on the above technical solution, the following improvements can be made:

[0012] As a preferred solution, the power supply device includes: a voltage source, a main contactor K1, a line contactor K2, a pre-charge contactor K3, a discharge contactor K4, a pre-charge resistor R1, a discharge resistor R2 and an energy storage capacitor C1;

[0013] The positive electrode and the negative electrode of the voltage source are electrically connected to the L1 terminal and the L2 terminal of the main contactor K1 respectively;

[0014] The T1 terminal of the main contactor K1, the parallel subcircuit, the series subcircuit, and the T2 terminal of the main contactor K1 are electrically connected in sequence to form a power supply circuit;

[0015] The parallel subcircuit includes: a pre-charging circuit and a line contactor K2 arranged in parallel, and the pre-charging circuit includes: a pre-charging contactor K3 and a pre-charging resistor R1 connected in series;

[0016] The series subcircuit includes: a discharge contactor K4 and a discharge resistor R2 arranged in series, and the two ends of the series subcircuit are respectively electrically connected to the positive electrode and the negative electrode of the power module under test;

[0017] The energy storage capacitor C1 is connected in parallel to both ends of the series sub-circuit.

[0018] As a preferred solution, the power supply device further includes: a voltage sensor V1, a voltage sensor V2 and a current sensor V3;

[0019] The two ends of the voltage sensor V1 are electrically connected to the T1 end and the T2 end of the main contactor K1 respectively;

[0020] Two ends of the voltage sensor V2 are electrically connected to two ends of the series sub-circuit respectively;

[0021] The current sensor V3 is connected in series in the power supply circuit;

[0022] The voltage sensor V1 , the voltage sensor V2 , and the current sensor V3 are all connected to the control device for communication.

[0023] As a preferred solution, the voltage source includes: an AC input power supply and a voltage conversion module, wherein the voltage conversion module is used to convert the AC power of the AC input power supply into DC power of any voltage value and output it.

[0024] As a preferred solution, the load device includes: an LC filter, a load contactor K5 and three load resistors.

[0025] As a preferred solution, the load device includes: current sensor V4, current sensor V5, current sensor V6, voltage sensor V7, voltage sensor V8, voltage sensor V9;

[0026] The current sensor V4, the current sensor V5, and the current sensor V6 are respectively connected in series to the three branches of the load device, and are used to collect the current value on any branch;

[0027] Voltage sensor V7, voltage sensor V8, and voltage sensor V9 are used to collect the voltage value between any two branches.

[0028] As a preferred solution, the control device includes:

[0029] A human-machine interaction device, which is communicatively connected with the detection controller and is used to realize human-machine interaction;

[0030] A detection controller, which is connected to the human-machine interaction device and the drive controller through data lines, and is used to receive control instructions from the human-machine interaction device and control the on and off of the corresponding contactor;

[0031] Drive controller, which is used to realize central control;

[0032] The power module is used to provide the required working power for the human-machine interaction device, the detection controller and the drive controller.

[0033] As a preferred solution, the drive controller includes: a power conversion unit, an MCU control unit, a sensor acquisition unit electrically connected to the MCU control unit, an SVPWM trigger, a contactor control unit and a state feedback unit;

[0034] The power conversion unit is electrically connected to the power module and is used to convert the input power of the power module into the working voltage required by each unit in the drive controller;

[0035] The sensor acquisition unit is used to receive the voltage and current values ​​collected from the power supply device and the load device, convert them into analog signals, and send them to the MCU control unit;

[0036] The MCU control unit is used to modulate and demodulate the SVPWM signal according to the analog signals of the voltage and current values ​​collected from the power supply device and the load device, drive the power electronic devices of the power module under test, and control the power module under test to stably output three-phase AC power;

[0037] The SVPWM trigger is used to convert the SVPWM signal sent by the MCU control unit into the required level for driving the power electronic device of the power module under test;

[0038] The contactor control unit is used to control the on and off of the corresponding contactors in the power supply device and the load device;

[0039] The state feedback unit is used to receive the state feedback signal of the corresponding contactor in the power supply device and the load device, and the state feedback signal of the power module under test, and convert it into a level acceptable to the MCU control unit and send it to the MCU control unit.

[0040] As a preferred solution, the control device also includes:

[0041] The monitoring and display unit is connected to the drive controller for real-time display of monitoring data and abnormal alarm data of the power module under test.

[0042] The utility model discloses an off-line detection device for a power module of a rail transit vehicle-mounted auxiliary power supply system, which can provide an SVPWM signal and perform off-line comprehensive detection on the power module to be tested, with high detection efficiency and good detection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 This is a principle block diagram of an offline detection device provided in an embodiment of the utility model.

[0045] Figure 2 A circuit diagram of a power supply device provided in an embodiment of the utility model.

[0046] Figure 3 A circuit diagram of a power module under test provided in an embodiment of the utility model.

[0047] Figure 4 A circuit diagram of a load device provided in an embodiment of the utility model.

[0048] Figure 5 A specific principle block diagram of the control device provided in an embodiment of the utility model.

[0049] Figure 6 A circuit diagram of an SVPWM digital signal trigger provided in an embodiment of the utility model.

[0050] Figure 7 A circuit diagram of an SVPWM fiber optic isolation trigger provided in an embodiment of the utility model.

[0051] Figure 8 A circuit diagram of a contactor control unit provided in an embodiment of the utility model.

[0052] Fig. 9 A circuit diagram of a state feedback unit provided in an embodiment of the utility model.

[0053] Fig.10 A circuit diagram of an analog circuit working power supply provided in an embodiment of the utility model.

[0054] Fig.11 A circuit diagram of a sensor acquisition unit provided in an embodiment of the utility model.

[0055] Fig.12 A circuit diagram of a digital circuit working power supply provided in an embodiment of the utility model.

[0056] Fig.13 A circuit diagram of the working power supply of the MCU control unit provided in an embodiment of the utility model.

[0057] Fig.14 This is a waveform diagram of the output of the power module under test provided by an embodiment of the utility model.

[0058] Among them: 1-power module under test, 2-power supply device, 3-load device, 4-control device. DETAILED DESCRIPTION

[0059] The preferred embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0060] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0061] In addition, the expression of “comprising” an element is an “open” expression, which simply means that a corresponding component exists, and should not be interpreted as excluding additional components.

[0062] In order to achieve the purpose of the utility model, in some embodiments of an offline detection device for a power module of a rail transit vehicle auxiliary power supply system, the offline detection device is used to perform offline detection on a power module 1 under test, and the power module 1 under test is a three-phase inverter bridge circuit.

[0063] The off-line detection device comprises: a power supply device 2 , a load device 3 and a control device 4 .

[0064] The power supply device 2 includes: a voltage source, several contactors, several voltage sensors and several current sensors. The power supply device 2 is electrically connected to the input end of the power module 1 under test, and is used to provide voltage to the power module 1 under test, collect corresponding voltage and current values ​​in real time, and send them to the control device 4.

[0065] The load device 3 includes: a plurality of contactors, a plurality of voltage sensors, a plurality of current sensors and a plurality of loads. The load device 3 is electrically connected to the output end of the power module 1 under test, and is used to collect corresponding voltage and current values ​​in real time and send them to the control device 4 .

[0066] The control device 4 is used to control the on and off of the corresponding contactor, send SVPWM signals to the power electronic devices of the power module 1 under test, and adjust the duty cycle of the SVPWM signal in real time according to the voltage and current values ​​to control the power module 1 under test to stably output three-phase AC power.

[0067] Each part of the offline detection equipment is described in detail below.

[0068] Furthermore, the power supply device 2 includes: a voltage source, a main contactor K1, a line contactor K2, a pre-charge contactor K3, a discharge contactor K4, a pre-charge resistor R1, a discharge resistor R2 and an energy storage capacitor C1, a voltage sensor V1, a voltage sensor V2 and a current sensor V3. The voltage source includes: an AC input power supply and a voltage conversion module, and the voltage conversion module is used to convert the AC power of the AC input power supply into a DC power of any voltage value and output it.

[0069] The voltage conversion module may select a DC power supply unit P1, which receives an external input of 380VAC and provides an arbitrarily adjustable DC power output of 0 to 2KVDC after conversion.

[0070] The positive electrode and the negative electrode of the voltage source are electrically connected to the L1 terminal and the L2 terminal of the main contactor K1 respectively;

[0071] The T1 terminal of the main contactor K1, the parallel subcircuit, the series subcircuit, and the T2 terminal of the main contactor K1 are electrically connected in sequence to form a power supply circuit;

[0072] The parallel subcircuit includes: a pre-charging circuit and a line contactor K2 arranged in parallel, and the pre-charging circuit includes: a pre-charging contactor K3 and a pre-charging resistor R1 connected in series;

[0073] The series subcircuit includes: a discharge contactor K4 and a discharge resistor R2 arranged in series, and the two ends of the series subcircuit are respectively electrically connected to the positive electrode and the negative electrode of the power module 1 under test;

[0074] The energy storage capacitor C1 is connected in parallel to both ends of the series sub-circuit.

[0075] The two ends of the voltage sensor V1 are electrically connected to the T1 end and the T2 end of the main contactor K1 respectively;

[0076] Two ends of the voltage sensor V2 are electrically connected to two ends of the series sub-circuit respectively;

[0077] The current sensor V3 is connected in series in the power supply circuit;

[0078] The voltage sensor V1 , the voltage sensor V2 , and the current sensor V3 are all connected to the control device 4 for communication.

[0079] The main contactor K1, line contactor K2, pre-charge contactor K3, pre-charge resistor R1, and energy storage capacitor C1 constitute a power output control network, which controls the transmission and shutoff of the DC power supply to the outside.

[0080] The above-mentioned discharge contactor K4 and discharge resistor R2 constitute a safe discharge network, which serves to provide a discharge circuit for the electric energy stored in the bus capacitor after power failure.

[0081] The voltage sensor V1 , the voltage sensor V2 and the current sensor V3 constitute a power supply system detection network, which functions to detect the power supply voltage and current in real time and provide judgment data for the control of the control device 4 .

[0082] Further, the load device 3 includes: an LC filter (L1, C2, C3, C4), a load contactor K5, three load resistors (R3, R4, R5) and a current sensor V4, a current sensor V5, a current sensor V6, a voltage sensor V7, a voltage sensor V8, and a voltage sensor V9.

[0083] The three load resistors R3, R4 and R5 constitute a load resistor network.

[0084] The current sensor V4, the current sensor V5, and the current sensor V6 are respectively connected in series to the three branches of the load device 3, and are used to collect the current value on any branch;

[0085] Voltage sensor V7, voltage sensor V8, and voltage sensor V9 are used to collect the voltage value between any two branches.

[0086] The SVPWM modulation signal converted and output by the power module 1 under test is filtered by the LC filter and outputs 380VAC three-phase AC power. The load contactor K5 controls the connection or disconnection of the load resistance network. The current sensor V4, current sensor V5, current sensor V6, voltage sensor V7, voltage sensor V8, and voltage sensor V9 collect the current and voltage values ​​output by the power module 1 under test in real time, and provide the data required for the MCU control unit to modulate the SVPWM signal duty cycle in real time.

[0087] Furthermore, the control device 4 includes: a human-machine interaction device, a detection controller, a drive controller, and a power module. The human-machine interaction device may be, but is not limited to, a text display (HMI); the detection controller may be, but is not limited to, a programmable controller (PLC).

[0088] The human-machine interface (HMI) and programmable controller (PLC) exchange data via the RS232 serial port to control the on and off of each contactor in real time, and monitor and display the feedback data of the operating status of each component and various abnormal alarm indications in real time.

[0089] The detection controller is connected to the human-machine interaction device and the drive controller through data lines respectively, and is used to receive control instructions from the human-machine interaction device and control the on and off of the corresponding contactor.

[0090] The programmable controller (PLC) serves as a transfer station between the human-machine interface (HMI) and the drive controller. It receives control instructions from the human-machine interface (HMI), sends the instructions to the drive controller, and transmits data (such as sensor data, feedback signals of the controlled contactor status, etc.) sent back by the drive controller to the human-machine interface (HMI) for display.

[0091] The power module is used to provide the required working power for the human-machine interaction device, the detection controller and the drive controller.

[0092] Furthermore, the drive controller includes: a power conversion unit, an MCU control unit, a sensor acquisition unit electrically connected to the MCU control unit, an SVPWM trigger, a contactor control unit and a state feedback unit.

[0093] The power conversion unit is an internal power source, which is electrically connected to the power module and is used to convert the input power of the power module into the working voltage required by each unit in the drive controller.

[0094] The power conversion unit is used to realize DC / DC conversion, converting the single DC power output by the power module into the working voltage required by each functional block of the drive controller. It includes the following three groups of independent DC / DC power supplies.

[0095] 1) Analog circuit working power supply (±15VDC), used to power the sensor, such as Fig.10 shown.

[0096] 2) Digital circuit working power supply (+15VDC), such as Fig.12 shown.

[0097] 3) MCU control unit working power supply (+5VDC), such as Fig.13 shown.

[0098] The power supplies required to drive the controller are integrated onto the board to avoid external dependence and improve its portability.

[0099] The sensor acquisition unit is used to receive the voltage and current values ​​collected from the power supply device 2 and the load device 3, convert them into analog signals, and then send them to the MCU control unit.

[0100] This circuit is compatible with the sampling of sensor feedback signals of two output types, voltage and current. By adjusting the resistance values ​​of R3, R5, and R7, it can adapt to the sampling of different current-type feedback signals. When the resistors at the positions of R3, R5, and R7 are removed and the resistance values ​​of R9, R10, R13, R14, and R17 are adjusted at the same time, it can adapt to the sampling of different voltage-type feedback signals. In addition, when the sensor samples an AC signal, just leave R28 floating and install a 0Ω resistor in R27; conversely, when the sensor samples a DC signal, just leave R27 floating and install a 0Ω resistor in R28. V_BIAS_ADC is the sampling reference voltage source, such as Fig.11 shown.

[0101] The MCU control unit is used to modulate and demodulate the SVPWM signal according to the analog signals of the voltage and current values ​​collected from the power supply device 2 and the load device 3, drive the power electronic devices of the power module 1 under test, control the power module 1 under test to stably output 380VAC three-phase alternating current, and control the output voltage waveform of the power module 1 under test, such as Fig.14 shown.

[0102] At the same time, this unit receives the action instructions issued by the programmable controller (PLC) in real time, and controls the lower-level controlled objects in real time according to the instructions. (For example: controlling the on and off of the controlled contactors K1, K2, K3, K4 and K5, controlling the start and stop of the measured power module, etc.), and converts the collected voltage and current signals into standard quantities, and transmits the converted data to the text display (HMI) for display.

[0103] Example: The MCU control unit sets the sampling voltage of the voltage sensor V1 of 0 to 3V to the corresponding output voltage of the DC power supply unit P1 of 0 to 1500V. When the output voltage of the DC power supply unit P1 is 750V, the sampling voltage transmitted by the voltage sensor V1 received by the MCU control unit is 1.5V. The MCU control unit converts the per-unit value to 750V and transmits it to the text display (HMI). At this time, the voltage displayed on the text display (HMI) is 750V.

[0104] The SVPWM trigger is used to convert the 6-channel SVPWM signal sent by the MCU control unit into the required level for IGBT driving, and directly drive and control the 6-channel IGBT power electronic devices of the power module 1 under test. To improve the compatibility of this device, the SVPWM trigger specifically includes: Figure 6 The SVPWM digital signal trigger shown in Figure 7 The SVPWM fiber-optic isolated trigger is shown.

[0105] The contactor control unit is used to control the on and off of the corresponding contactors in the power supply device 2 and the load device, such as Figure 8 shown.

[0106] Example: When the text display (HMI) issues a control instruction for the corresponding contactor to close, the instruction is converted by the programmable controller (PLC) and sent to the MCU control unit. The MCU control unit sends a high-level MCU_Relay signal, A5 is turned on, the RL1_1 pin becomes a low level, RL1 works, and the RL1_3 and 4 pins are connected. Otherwise, the RL1_3 and 4 pins are disconnected.

[0107] The state feedback unit is used to receive the state feedback signal of the corresponding contactor in the power supply device 2 and the load device 3, and the state feedback signal of the power module 1 under test, and convert it into a level acceptable to the MCU control unit and send it to the MCU control unit, such as Fig. 9 shown.

[0108] Note: When the EXT_FeedBack signal is high, D3 is turned on, D3_6 pin outputs low level, and U5C_6 pin outputs high level. Conversely, U5C_6 pin outputs low level. By adjusting the parameters of R51, R59, C35, VR1, and VR2, you can adapt to EXT_FeedBack signals of different voltage levels.

[0109] The drive controller controls the contactor and collects the contactor status feedback. It adopts hardware circuit design and is integrated into the board to shorten the response delay, reduce the design cost and improve the stability of the equipment.

[0110] Furthermore, the control device 4 further includes: a monitoring display unit. The monitoring display unit may be, but is not limited to, a computer.

[0111] The monitoring and display unit is in communication connection with the drive controller, and is used for displaying the monitoring data and abnormal alarm data of the tested power module 1 in real time.

[0112] The workflow of this utility model is as follows:

[0113] First, the main contactor K1 is controlled to be closed to supply high voltage DC power to the next stage.

[0114] During this process, the main contactor K1 transmits its "normal closure" signal back to the MCU control unit through a set of normally open auxiliary switches, and the voltage sensor V1 transmits the real-time detected voltage signal to the MCU control unit. If the MCU control unit detects that any of the above two sets of signals is abnormal, all subsequent input instructions will be invalid, and the corresponding fault indication will be displayed on the human-computer interaction device.

[0115] Second, control the pre-charging contactor K3 to be energized, and the pre-charging contactor K3 and the pre-charging contactor R1 charge the energy storage capacitor C1. When the voltage across the energy storage capacitor C1 rises to the set value of the MCU control unit, the pre-charging contactor K3 is disconnected and the line contactor K2 is energized, and the entire pre-charging process is completed.

[0116] During this process, the line contactor K2 and the pre-charging contactor K3 transmit their "normal closure" signals to the MCU control unit through their respective sets of normally open auxiliary switches, and the voltage sensor V2 transmits the real-time detected voltage signal to the MCU control unit. If the MCU control unit detects that any of the above two sets of signals is abnormal, all subsequent input instructions will be invalid, and the corresponding fault indication will be displayed on the human-computer interaction device.

[0117] Third, the MCU control unit sends 6 SVPWM signals to drive the 6 controlled IGBTs to turn on and off. The IGBT output signals are filtered by the LC filter and then output 380VAC three-phase AC power.

[0118] During this process, the MCU control unit performs voltage and current dual closed-loop PID control based on real-time data sent back by voltage sensor V7, voltage sensor V8, voltage sensor V9, current sensor V4, current sensor V5, and current sensor V6, and adjusts the SVPWM duty cycle in real time according to load demand to ensure the stability of the output 380VAC.

[0119] At the same time, the MCU control unit receives 6 IGBT status feedback signals in real time. If any one or more IGBTs are abnormal, the MCU control unit terminates the SVPWM signal transmission and displays the corresponding fault indication on the human-machine interaction device.

[0120] When the above test is finished or during the test, if you want to terminate the test, the MCU control unit controls the discharge contactor K4 to close according to the monitoring voltage value sent back by the voltage sensor V2. If it is higher than the safety voltage threshold set by the MCU control unit, the MCU control unit will control the discharge contactor K4 to be attracted until the data sent back by the voltage sensor V2 is lower than the safety voltage threshold set by the MCU control unit. The MCU control unit controls the discharge contactor K4 to reset, so as to discharge the energy stored in the energy storage capacitor C1 and the capacitor in the power module under test through the discharge resistor R2.

[0121] The utility model discloses an off-line detection device for a power module of a rail transit vehicle-mounted auxiliary power supply system, which can provide an SVPWM signal and perform off-line comprehensive detection on the power module to be tested, with high detection efficiency and good detection effect.

[0122] The utility model adds a new detection item point to the power module to be tested, thereby improving the repair rate of the power module to be tested.

[0123] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0124] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0125] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which shall fall within the scope of the utility model to be protected. The scope of protection of the utility model shall be defined by the attached claims and their equivalents.

[0126] The control method of the present invention is to control by manually starting and closing the switch. The wiring diagram of the power element and the provision of power supply are common knowledge in the field, and the present invention is mainly used to protect mechanical devices, so the present invention will not explain the control method and wiring arrangement in detail.

Claims

1. Offline detection equipment for power modules of rail transit vehicle auxiliary power supply system, characterized in that: The offline detection device is used to perform offline detection on the power module under test, and the power module under test is a three-phase inverter bridge circuit; The offline detection equipment comprises: A power supply device, the power supply device comprising: a voltage source, a plurality of contactors, a plurality of voltage sensors and a plurality of current sensors, the power supply device being electrically connected to the input end of the power module under test, for providing voltage to the power module under test, collecting corresponding voltage and current values ​​in real time, and sending them to the control device; A load device, comprising: a plurality of contactors, a plurality of voltage sensors, a plurality of current sensors and a plurality of loads, wherein the load device is electrically connected to the output end of the power module under test, and is used to collect corresponding voltage and current values ​​in real time and send them to the control device; The control device is used to control the on and off of the corresponding contactor, send SVPWM signals to the power electronic devices of the power module under test, and adjust the duty cycle of the SVPWM signal in real time according to the voltage and current values ​​to control the power module under test to stably output three-phase alternating current.

2. The off-line detection device according to claim 1, characterized in that: The power supply device includes: a voltage source, a main contactor K1, a line contactor K2, a pre-charge contactor K3, a discharge contactor K4, a pre-charge resistor R1, a discharge resistor R2 and an energy storage capacitor C1; The positive electrode and the negative electrode of the voltage source are electrically connected to the L1 terminal and the L2 terminal of the main contactor K1 respectively; The T1 terminal of the main contactor K1, the parallel subcircuit, the series subcircuit, and the T2 terminal of the main contactor K1 are electrically connected in sequence to form a power supply circuit; The parallel subcircuit comprises: a pre-charging circuit and a line contactor K2 arranged in parallel, and the pre-charging circuit comprises: a pre-charging contactor K3 and a pre-charging resistor R1 connected in series; The series subcircuit comprises: a discharge contactor K4 and a discharge resistor R2 arranged in series, and the two ends of the series subcircuit are respectively electrically connected to the positive electrode and the negative electrode of the power module under test; The energy storage capacitor C1 is connected in parallel to both ends of the series sub-circuit.

3. The off-line detection device according to claim 2, characterized in that: The power supply device further includes: a voltage sensor V1, a voltage sensor V2 and a current sensor V3; The two ends of the voltage sensor V1 are electrically connected to the T1 end and the T2 end of the main contactor K1 respectively; The two ends of the voltage sensor V2 are electrically connected to the two ends of the series sub-circuit respectively; The current sensor V3 is connected in series in the power supply circuit; The voltage sensor V1 , the voltage sensor V2 and the current sensor V3 are all in communication connection with the control device.

4. The off-line detection device according to claim 1, characterized in that: The voltage source comprises: an AC input power supply and a voltage conversion module, wherein the voltage conversion module is used to convert the AC power of the AC input power supply into a DC power of any voltage value and output it.

5. The off-line detection device according to claim 1, characterized in that: The load device includes: an LC filter, a load contactor K5 and three load resistors.

6. The off-line detection device according to claim 5, characterized in that: The load device includes: a current sensor V4, a current sensor V5, a current sensor V6, a voltage sensor V7, a voltage sensor V8, and a voltage sensor V9; The current sensor V4, current sensor V5, and current sensor V6 are respectively connected in series to the three branches of the load device, and are used to collect the current value on any branch; The voltage sensor V7, the voltage sensor V8 and the voltage sensor V9 are used to collect the voltage value between any two branches.

7. The off-line detection device according to claim 1, characterized in that: The control device comprises: A human-computer interaction device, which is communicatively connected with the detection controller and is used to realize human-computer interaction; A detection controller, which is connected to the human-machine interaction device and the drive controller through data lines, and is used to receive control instructions from the human-machine interaction device and control the on and off of the corresponding contactor; A drive controller, wherein the drive controller is used to implement central control; A power supply module is used to provide the required working power to the human-machine interaction device, the detection controller and the drive controller.

8. The off-line detection device according to claim 7, characterized in that: The drive controller includes: a power conversion unit, an MCU control unit, a sensor acquisition unit electrically connected to the MCU control unit, an SVPWM trigger, a contactor control unit and a state feedback unit; The power conversion unit is electrically connected to the power module and is used to convert the input power of the power module into the working voltage required by each unit in the drive controller; The sensor acquisition unit is used to receive the voltage and current values ​​collected from the power supply device and the load device, convert them into analog signals, and send them to the MCU control unit; The MCU control unit is used to modulate and demodulate the SVPWM signal according to the analog signals of the voltage and current values ​​collected from the power supply device and the load device, drive the power electronic devices of the power module under test, and control the power module under test to stably output three-phase alternating current; The SVPWM trigger is used to convert the SVPWM signal sent by the MCU control unit into the level required for driving the power electronic device of the power module under test; The contactor control unit is used to control the on and off of corresponding contactors in the power supply device and the load device; The state feedback unit is used to receive the state feedback signal of the corresponding contactor in the power supply device and the load device, and the state feedback signal of the power module under test, and convert it into a level acceptable to the MCU control unit and send it to the MCU control unit.

9. The off-line detection device according to claim 8, characterized in that: The control device also includes: The monitoring and display unit is connected to the drive controller for displaying the monitoring data and abnormal alarm data of the power module under test in real time.

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