Online state monitoring device and monitoring method of IGCT (integrated gate commutated thyristor) device and flexible direct current converter valve

Abstract

The invention discloses an on-line state monitoring device and method of an IGCT device and a flexible direct current converter valve. The on-line state monitoring device of the IGCT device comprises a conduction voltage drop monitoring module, an off-state current monitoring module, an on-off delay time monitoring module, a voltage change rate monitoring module, a current change rate monitoring module, a turn-off voltage peak monitoring module, an electrical quantity acquisition module and a control panel. The electrical quantity acquisition module is connected with the IGCT device, and the on voltage drop monitoring module, the off-state current monitoring module, the on and off delay time monitoring module, the voltage change rate monitoring module, the current change rate monitoring module and the off voltage peak monitoring module are respectively connected with the electrical quantity acquisition module and the control panel. According to the technical scheme, online monitoring of the state of the IGCT device can be achieved, the accuracy of health state evaluation of the IGCT device is improved, and then the safety of the IGCT device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronics, and in particular to an online state monitoring device and a monitoring method for an IGCT device, and a flexible direct current converter valve. Background Art

[0002] The core equipment of flexible direct current transmission is the converter valve, which undertakes key tasks such as AC / DC conversion, power flow control, and fault ride-through. The traditional flexible direct current converter valve adopts the cascade method based on the press-fit IGBT (insulated gate bipolar transistor) power module. The press-fit IGBT device has the advantages of failure short circuit and double-sided heat dissipation, but because it uses multiple chips in parallel, it increases the manufacturing cost and reduces the reliability of the device. Compared with IGBT, the IGCT (integrated gate commutated thyristor) device is a whole wafer structure with lower on-state voltage drop, higher reliability and lower manufacturing cost. However, since the characteristics of IGCT devices are different from those of traditional IGBT devices, including integrated current source drive board, positive feedback opening process, etc., in order to ensure the safe and reliable operation of IGCT devices, it is necessary to monitor the status of IGCT devices online. However, the existing research lacks the design of IGCT device status monitoring, so the status of IGCT devices cannot be monitored online, and the health status of IGCT devices cannot be accurately evaluated, which makes the safety of IGCT devices low. Summary of the invention

[0003] The present invention provides an online state monitoring device, a monitoring method and a flexible DC-DC converter valve of an IGCT device, so as to realize online monitoring of the state of the IGCT device, improve the accuracy of the health state assessment of the IGCT device, and further improve the safety of the IGCT device.

[0004] According to one aspect of the present invention, an online state monitoring device for an IGCT device is provided, comprising: an on-state voltage drop monitoring module, an off-state current monitoring module, an on- and off-delay time monitoring module, a voltage change rate monitoring module, a current change rate monitoring module, an off-voltage spike monitoring module, an electrical quantity acquisition module and a control board;

[0005] The electrical quantity acquisition module is connected to the IGCT device in the unit to be tested, and is used to obtain the electrical quantity of the IGCT device at each stage; wherein the electrical quantity includes current and voltage;

[0006] The conduction voltage drop monitoring module is connected to the electrical quantity acquisition module, and is used to measure the real-time current and conduction voltage drop according to the current and voltage of the IGCT device in the conduction stage, and transmit them to the control board as the first state monitoring information;

[0007] The off-state current monitoring module is connected to the electrical quantity acquisition module, and is used to measure the leakage current in the off state according to the current of the IGCT device in the off stage, and transmit it to the control board as the second state monitoring information;

[0008] The control board is communicatively connected with the drive circuit in the unit to be tested, and is used to output a command signal to the unit to be tested. The on- and off-delay time monitoring module is respectively connected with the electrical quantity acquisition module and the drive circuit. The on- and off-delay time monitoring module is used to measure the on-delay time according to the command signal and the time required for the voltage of the IGCT device to decrease to a preset voltage value, and is used to measure the off-delay time according to the command signal and the time required for the current of the IGCT device to decrease to a preset current value, and transmit the on-delay time and the off-delay time to the control board as the third state monitoring information;

[0009] The voltage change rate monitoring module is connected to the electrical quantity acquisition module, and is used to measure the voltage change rate in the off state according to the voltage of the IGCT device in the off stage, and transmit it to the control board as the fourth state monitoring information;

[0010] The current change rate monitoring module is connected to the electrical quantity acquisition module, and is used to measure the current change rate in the on state according to the current of the IGCT device in the on stage, and transmit it to the control board as the fifth state monitoring information;

[0011] The shutdown voltage spike monitoring module is connected to the electrical quantity acquisition module, and is used to measure the voltage spike in the shutdown state according to the voltage peak value of the IGCT device in the shutdown stage, and transmit it to the control board as the sixth state monitoring information.

[0012] Optionally, the electrical quantity acquisition module includes: a current acquisition unit and a voltage acquisition unit;

[0013] The input end of the current acquisition unit is connected to the IGCT device, and the output end of the current acquisition unit is respectively connected to the on-state voltage drop monitoring module, the off-state current monitoring module, the turn-on and turn-off delay time monitoring module and the current change rate monitoring module; the input end of the voltage acquisition unit is connected to the IGCT device, and the output end of the voltage acquisition unit is respectively connected to the on-state voltage drop monitoring module, the turn-on and turn-off delay time monitoring module, the voltage change rate monitoring module and the turn-off voltage spike monitoring module.

[0014] Optionally, the control board is further used to control the IGCT device to shut down when any state monitoring information is abnormal.

[0015] Optionally, the on-state voltage drop monitoring module, the off-state current monitoring module, the turn-on and turn-off delay time monitoring module, the voltage change rate monitoring module, the current change rate monitoring module and the turn-off voltage spike monitoring module are independently integrated on a monitoring board.

[0016] Optionally, the stage in which the voltage of the IGCT device is reduced to a preset voltage value includes a stage in which the voltage is reduced to 90%; the stage in which the current of the IGCT device is reduced to a preset current value includes a stage in which the current is reduced to 40%.

[0017] Optionally, the command signal includes an on command signal and an off command signal;

[0018] The on-command signal is associated with the on-delay time; the off-command signal is associated with the off-delay time.

[0019] According to another aspect of the present invention, there is provided an online state monitoring method for an IGCT device, comprising:

[0020] The electrical quantity acquisition module acquires the electrical quantities of the IGCT device in the unit to be tested at each stage; wherein the electrical quantities include current and voltage;

[0021] The conduction voltage drop monitoring module measures the real-time current and conduction voltage drop according to the current and voltage of the IGCT device in the conduction phase, and transmits the real-time current and conduction voltage drop to the control board as the first state monitoring information;

[0022] The off-state current monitoring module measures the leakage current in the off-state according to the current of the IGCT device in the off-state phase, and transmits the leakage current to the control board as the second state monitoring information;

[0023] The on- and off-delay time monitoring module measures the on-delay time according to the command signal and the time required for the voltage of the IGCT device to tend to be stable, and measures the off-delay time according to the command signal and the time required for the current of the IGCT device to tend to be stopped, and transmits the on-delay time and the off-delay time to the control board as the third state monitoring information;

[0024] The voltage change rate monitoring module measures the voltage change rate in the off state according to the voltage of the IGCT device in the off stage, and transmits it to the control board as fourth state monitoring information;

[0025] The current change rate monitoring module measures the current change rate in the on state according to the current of the IGCT device in the on stage, and transmits it to the control board as fifth state monitoring information;

[0026] The turn-off voltage spike monitoring module measures the voltage spike in the turn-off state according to the voltage peak value of the IGCT device in the turn-off stage, and transmits the voltage spike to the control board as the sixth state monitoring information.

[0027] Optionally, the online status monitoring method of the IGCT device further includes:

[0028] When any state monitoring information is abnormal, the control board controls the IGCT device to shut down.

[0029] Optionally, the stage in which the voltage of the IGCT device is reduced to a preset voltage value includes a stage in which the voltage is reduced to 90%; the stage in which the current of the IGCT device is reduced to a preset current value includes a stage in which the current is reduced to 40%; and the command signal includes an on command signal and a off command signal;

[0030] The on and off delay time monitoring module measures the on delay time according to the command signal and the time required for the voltage of the IGCT device to decrease to a preset voltage value, including:

[0031] When the opening command signal is received, the opening and closing delay time monitoring module measures the time required for the voltage of the IGCT device to drop to 90% to obtain the opening delay time;

[0032] Measuring the turn-off delay time according to the command signal and the time required for the current of the IGCT device to decrease to a preset current value, comprising:

[0033] When the shutdown command signal is sent, the on and off delay time monitoring module measures the time required for the current of the IGCT device to drop to 40% to obtain the shutdown delay time.

[0034] According to another aspect of the present invention, there is provided a flexible DC converter valve, comprising the online state monitoring device for the IGCT device provided by any one of the above embodiments.

[0035] The technical solution of the embodiment of the present invention, by setting a conduction voltage drop monitoring module, an off-state current monitoring module, an on and off delay time monitoring module, a voltage change rate monitoring module, a current change rate monitoring module, a shut-off voltage spike monitoring module, an electrical quantity acquisition module and a control board, the electrical quantity acquisition module can obtain the current and voltage of the IGCT device in the unit to be tested at each stage, and further transmit the current and / or voltage to each monitoring module, each monitoring module then measures multiple key parameters of the IGCT device in real time during operation according to the current and / or voltage, and further transmits each key parameter to the control board, and the control board then performs storage operations or control actions according to the values ​​of each key parameter. It can realize online monitoring of the state of the IGCT device, and then can monitor multiple key parameters of the IGCT device in real time, comprehensively evaluate the health state of the IGCT device, thereby improving the accuracy of the health state evaluation of the IGCT device, and then improving the safety of the IGCT device, ensuring the safe operation of the IGCT device, and is very suitable for application in high-power equipment based on IGCT.

[0036] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A schematic structural diagram of an online status monitoring device for an IGCT device provided according to an embodiment of the present invention;

[0039] Figure 2 A schematic diagram of a switching process of an IGCT device provided by an embodiment of the present invention;

[0040] Figure 3 A schematic structural diagram of another online state monitoring device for an IGCT device provided according to an embodiment of the present invention;

[0041] Figure 4 A flowchart of an online state monitoring method of an IGCT device provided according to an embodiment of the present invention;

[0042] Figure 5 The present invention is a flowchart of another online status monitoring method of an IGCT device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] Figure 1 FIG. 1 is a schematic diagram of the structure of an online status monitoring device for an IGCT device according to an embodiment of the present invention, with reference to FIG. Figure 1The online state monitoring device of the IGCT device includes: a conduction voltage drop monitoring module 10, an off-state current monitoring module 20, an on-time and off-time delay monitoring module 30, a voltage change rate monitoring module 40, a current change rate monitoring module 50, a off-voltage spike monitoring module 60, an electrical quantity acquisition module 70 and a control board 80; the electrical quantity acquisition module 70 is connected to the IGCT device 102 in the unit to be tested 100, and is used to obtain the electrical quantity of the IGCT device 102 at each stage; wherein the electrical quantity includes current and voltage; the conduction voltage drop monitoring module 10 is connected to the electrical quantity acquisition module 70 The control board 80 is connected to the drive circuit 101 in the unit to be tested 100 for outputting a command signal to the unit to be tested 100. The on and off delay time monitoring modules 30 are connected to the electrical quantity acquisition module 70 for measuring the leakage current in the off state according to the current of the IGCT device 102 in the off stage, and transmitting the same to the control board 80 as the second state monitoring information. The control board 80 is connected to the drive circuit 101 in the unit to be tested 100 for outputting a command signal to the unit to be tested 100. The on and off delay time monitoring modules 30 are connected to the electrical quantity acquisition module 70 for measuring the leakage current in the off state according to the current of the IGCT device 102 in the off stage, and transmitting the same to the control board 80 as the second state monitoring information. The quantity acquisition module 70 is connected to the drive circuit 101, the on and off delay time monitoring module 30 is used to measure the on delay time according to the command signal and the time required for the voltage of the IGCT device 102 to decrease to the preset voltage value stage, and is used to measure the off delay time according to the command signal and the time required for the current of the IGCT device 102 to decrease to the preset current value stage, and transmit the on delay time and the off delay time to the control board 80 as the third state monitoring information; the voltage change rate monitoring module 40 is connected to the electrical quantity acquisition module 70, and is used to measure the on ... time when the IGCT device 102 is on and off The voltage change rate in the off state is measured according to the voltage in the off stage, and is transmitted to the control board 80 as the fourth state monitoring information; the current change rate monitoring module 50 is connected to the electrical quantity acquisition module 70, and is used to measure the current change rate in the on state according to the current of the IGCT device 102 in the on stage, and is transmitted to the control board 80 as the fifth state monitoring information; the off voltage spike monitoring module 60 is connected to the electrical quantity acquisition module 70, and is used to measure the voltage spike in the off state according to the voltage peak value of the IGCT device 102 in the off stage, and is transmitted to the control board 80 as the sixth state monitoring information.

[0046] Among them, the first state monitoring information specifically includes the real-time current and conduction voltage drop flowing through the IGCT device 102; the second state monitoring information specifically includes the leakage current of the IGCT device 102 in the off state; the third state monitoring information specifically includes the turn-on delay time and the turn-off delay time of the IGCT device 102; the fourth state monitoring information specifically includes the voltage change rate of the IGCT device 102 in the off state; the fifth state monitoring information specifically includes the current change rate of the IGCT device 102 in the on state; the sixth state monitoring information specifically includes the voltage spike of the IGCT device 102 in the off state. Each state monitoring information is used to indicate the key parameters of the IGCT device 102 when it is in the working state, and is used to jointly characterize the health state of the IGCT device 102. The control board 80 is used to determine whether the key parameters of the IGCT device 102 are normal according to any monitoring information.

[0047] Specifically, the control board 80 outputs a command signal to turn on the drive circuit 101, and then outputs a drive signal to enable the IGCT device 102 to operate normally. At this time, the electrical quantity acquisition module 70 acquires the current and voltage flowing through the IGCT device 102 in real time. Further, the electrical quantity acquisition module 70 transmits the acquired current and voltage to each monitoring module, so that each monitoring module measures each key parameter of the IGCT device 102 according to the current and / or voltage at each stage.

[0048] Exemplarily, the on-state voltage drop monitoring module 10 measures the current and on-state voltage drop of the IGCT device 102 in real time, and further processes the current and on-state voltage drop, for example, converts them into the same data format as the data format received by the monitoring board 80, and then transmits them to the control board 80. The control board 80 stores the on-state characteristic curve of the IGCT device 102 component specification, and then the control board 80 compares the received current and on-state voltage drop with the typical on-state characteristic curve to determine whether the on-state voltage drop is within the normal range. Among them, the on-state voltage drop monitoring module 10 measures the current and on-state voltage drop of the IGCT device 102 in real time, and any existing measurement method can be used for measurement. For example, the on-state voltage drop monitoring module 10 can be integrated into an FPGA (Field-ProgrammableGate Array, field programmable gate array), and the FPGA converts the received analog signal (current signal and voltage signal) into a digital signal, and then processes and analyzes it through a specific algorithm inside the FPGA, and then calculates the real-time current and on-state voltage drop value. Alternatively, other measurement methods can be used, which will not be repeated here.

[0049] The off-state current monitoring module 20 measures the leakage current of the IGCT device 102 in the off state in real time, and further converts the data form of the leakage current into a data form that is the same as the data format received by the monitoring board 80, and transmits it to the control board 80. The control board 80 stores the value of the typical leakage current of the IGCT device 102, and compares the actual leakage current with the typical leakage current to determine whether the leakage current is within the normal range. Among them, the off-state current monitoring module 20 measures the leakage current of the IGCT device 102 in real time, and any existing measurement method can be used for measurement. For example, the off-state current monitoring module 20 can be integrated into the FPGA, and the FPGA converts the current signal measured through the leakage path when the IGCT device 102 is disconnected into a digital signal, and then calculates the leakage current through digital signal processing. Alternatively, other measurement methods can be used, which will not be repeated here.

[0050] The on-and-off delay time monitoring module 30 measures the on-and-off delay time and the off-and-on delay time of the IGCT device 102 in real time, and further converts the data form of the on-and-off delay time and the off-and-on delay time into the same data form as the data format received by the monitoring board 80, and transmits it to the control board 80. The control board 80 stores the on-and-off delay time and the off-and-on delay time within the normal range of the IGCT device 102, and compares it with the actually obtained on-and-off delay time to determine whether the on-and-off delay time and the off-and-on delay time are within the normal range. Among them, the on-and-off delay time monitoring module 30 measures the on-and-off delay time and the off-and-on delay time of the IGCT device 102 in real time, and any existing measurement method can be used for measurement. For example, the on-and-off delay time monitoring module 30 can be integrated into the FPGA, and the FPGA obtains the command signal of the driving circuit 101 in real time, and the FPGA drives the counter by using the internal high-precision clock as the time reference, and further can adjust the clock frequency through the divider to obtain the required time resolution. When the driving circuit is turned on or off, the FPGA starts timing. Furthermore, the FPGA converts the received analog signals (current signals and voltage signals) into digital signals, and then processes and analyzes them through a specific algorithm inside the FPGA to measure the turn-on delay time and turn-off delay time. Alternatively, other measurement methods may be used, which will not be described here.

[0051] The voltage change rate monitoring module 40 measures the voltage change rate of the IGCT device 102 in the off state in real time, and further converts the data form of the voltage change rate into the same data format as the data format received by the monitoring board 80, and transmits it to the control board 80. The control board 80 stores the voltage tolerance value of the IGCT device 102, for example, the voltage tolerance value can be 1000V / μs, and compares the actual voltage change rate with the voltage tolerance value to determine whether the voltage change rate is within the normal range. Among them, the voltage change rate monitoring module 40 measures the voltage change rate of the IGCT device 102 in the off state in real time, and any existing measurement method can be used for measurement. For example, the voltage change rate monitoring module 40 can be integrated into the FPGA, and the FPGA converts the voltage signal obtained in the off state into a digital signal, and samples the voltage value at a certain time interval, and then processes and analyzes it through a specific algorithm inside the FPGA to measure the voltage change rate in the off state. Alternatively, other measurement methods can be used, which will not be repeated here.

[0052] The current change rate monitoring module 50 measures the current change rate of the IGCT device 102 in the on state in real time, and further converts the data form of the current change rate into the same data format as the data format received by the monitoring board 80, and transmits it to the control board 80. The control board 80 stores the current tolerance value of the IGCT device 102, for example, the current tolerance value can be 5000A / μs, and compares the actual current change rate with the current tolerance value to determine whether the current change rate is within the normal range. Among them, the current change rate monitoring module 50 measures the current change rate of the IGCT device 102 in the on state in real time, and any existing measurement method can be used for measurement. For example, the current change rate monitoring module 50 can be integrated in the FPGA, and the FPGA is used to obtain the current signal in the on state, and convert the current signal into a digital signal, and then process and analyze it through a specific algorithm inside the FPGA to measure the current change rate in the on state. Alternatively, other measurement methods can be used, which will not be repeated here.

[0053] The shutdown voltage spike monitoring module 60 measures the voltage spike of the IGCT device 102 in the shutdown state in real time, and further converts the data form of the voltage spike into the same data format as the data format received by the monitoring board 80, and transmits it to the control board 80. The control board 80 stores the voltage spike threshold of the IGCT device 102, and compares the actual voltage spike with the voltage spike threshold to determine whether the voltage spike threshold is within the normal range. Among them, the shutdown voltage spike monitoring module 60 measures the voltage spike of the IGCT device 102 in the shutdown state in real time, and any existing measurement method can be used for measurement. For example, the shutdown voltage spike monitoring module 60 can be integrated into the FPGA, and the FPGA converts the voltage signal in the shutdown state into a digital signal, and then processes and analyzes it through a specific algorithm inside the FPGA to measure the voltage spike in the shutdown state. Alternatively, other measurement methods can be used, which will not be repeated here.

[0054] The technical solution of the embodiment of the present invention, by setting a conduction voltage drop monitoring module, an off-state current monitoring module, an on and off delay time monitoring module, a voltage change rate monitoring module, a current change rate monitoring module, a shut-off voltage spike monitoring module, an electrical quantity acquisition module and a control board, the electrical quantity acquisition module can obtain the current and voltage of the IGCT device in the unit to be tested at each stage, and further transmit the current and / or voltage to each monitoring module, each monitoring module then measures multiple key parameters of the IGCT device in real time during operation according to the current and / or voltage, and further transmits each key parameter to the control board, and the control board then performs storage operations or control actions according to the values ​​of each key parameter. It can realize online monitoring of the state of the IGCT device, and then can monitor multiple key parameters of the IGCT device in real time, comprehensively evaluate the health state of the IGCT device, thereby improving the accuracy of the health state evaluation of the IGCT device, and then improving the safety of the IGCT device, ensuring the safe operation of the IGCT device, and is very suitable for application in high-power equipment based on IGCT.

[0055] Continue to refer Figure 1 Optionally, the control board 80 is also used to control the IGCT device 102 to shut down when any state monitoring information is abnormal.

[0056] Specifically, when any state monitoring information is abnormal, the control board 80 outputs a shutdown command signal to the drive circuit 101, so that the drive circuit 101 is turned off, thereby turning off the IGCT device 102. Through this setting, the IGCT device can be monitored and protected online at the same time, which can ensure the safe and reliable operation of the IGCT device, thereby preventing accidents.

[0057] Optionally, the stage in which the voltage of the IGCT device is reduced to a preset voltage value includes a stage in which the voltage is reduced to 90%; the stage in which the current of the IGCT device is reduced to a preset current value includes a stage in which the current is reduced to 40%. Figure 2 A schematic diagram of a switching process of an IGCT device provided in an embodiment of the present invention, referring to Figure 2 , the voltage of the IGCT device is reduced to the preset voltage value, including the voltage V D Down to 0.9V D The stage experienced; the stage where the current of the IGCT device decreases to the preset current value includes the voltage I T Down to 0.4I T The stages experienced.

[0058] Optionally, the command signal CS includes an on-command signal and an off-command signal; the on-command signal is associated with an on-delay time; and the off-command signal is associated with an off-delay time.

[0059] Continue to refer Figure 2 For example, the turn-on command signal can be specifically understood as a signal when the command signal CS is at a high level; the turn-off command signal can be specifically understood as a signal when the command signal CS is at a low level.

[0060] Specifically, when the command signal CS is at a high level, the voltage of the IGCT device decreases to a preset voltage value, including the voltage V D Down to 0.9V D The time required for the stage is the opening delay time T don ; When the command signal CS is at a low level, the current of the IGCT device is reduced to a preset current value, including the voltage I T Down to 0.4I T The time required for the stage to be experienced is the shutdown delay time T doff .

[0061] Figure 3 FIG. 1 is a schematic diagram of the structure of another online state monitoring device for an IGCT device according to an embodiment of the present invention, referring to FIG. Figure 3On the basis of the above embodiments, optionally, the electrical quantity acquisition module 70 includes: a current acquisition unit 71 and a voltage acquisition unit 72; the input end of the current acquisition unit 71 is connected to the IGCT device 102, and the output end of the current acquisition unit 71 is respectively connected to the on-state voltage drop monitoring module 10, the off-state current monitoring module 20, the on-state and off-state delay time monitoring module 30 and the current change rate monitoring module 50; the input end of the voltage acquisition unit 72 is connected to the IGCT device 102, and the output end of the voltage acquisition unit 72 is respectively connected to the on-state voltage drop monitoring module 10, the on-state and off-state delay time monitoring module 30, the voltage change rate monitoring module 40 and the off-state voltage spike monitoring module 60.

[0062] Specifically, the current acquisition unit 71 may include a current transformer for real-time acquisition of the current of the IGCT device 102. The voltage acquisition unit 72 may include an inductor transformer for real-time acquisition of the voltage of the IGCT device 102. Further, the acquired current and / or voltage is transmitted to each correspondingly connected monitoring module.

[0063] Continue to refer Figure 3 Optionally, the on-state voltage drop monitoring module 10, the off-state current monitoring module 20, the turn-on and turn-off delay time monitoring module 30, the voltage change rate monitoring module 40, the current change rate monitoring module 50 and the turn-off voltage spike monitoring module 60 are independently integrated on a monitoring board 200.

[0064] The monitoring board 200 may be an FPGA, and has a one-to-one correspondence with the IGCT device 102 .

[0065] According to another aspect of the present invention, an online status monitoring method for an IGCT device is also provided, which can be applied to the online status monitoring device for an IGCT device provided in any of the above embodiments. Therefore, the online status monitoring method for an IGCT device also has the beneficial effects provided by any of the above embodiments.

[0066] Figure 4 A flowchart of an online state monitoring method for an IGCT device according to an embodiment of the present invention is provided. Figure 4 , the online status monitoring method of IGCT device includes:

[0067] S101. An electrical quantity acquisition module obtains electrical quantities of an IGCT device in a unit to be tested at each stage; wherein the electrical quantities include current and voltage.

[0068] S102 , the on-state voltage drop monitoring module measures the real-time current and on-state voltage drop according to the current and voltage of the IGCT device in the on-state phase, and transmits the real-time current and on-state voltage drop to the control board as the first state monitoring information.

[0069] S103 , the off-state current monitoring module measures the leakage current in the off-state according to the current of the IGCT device in the off-phase, and transmits the leakage current to the control board as the second state monitoring information.

[0070] S104, the turn-on and turn-off delay time monitoring module measures the turn-on delay time according to the command signal and the time required for the voltage of the IGCT device to decrease to a preset voltage value, and measures the turn-off delay time according to the command signal and the time required for the current of the IGCT device to decrease to a preset current value, and transmits the turn-on delay time and the turn-off delay time to the control board as the third state monitoring information.

[0071] S105 . The voltage change rate monitoring module measures the voltage change rate in the off state according to the voltage of the IGCT device in the off stage, and transmits the voltage change rate to the control board as fourth state monitoring information.

[0072] S106 . The current change rate monitoring module measures the current change rate in the on state according to the current of the IGCT device in the on stage, and transmits the current change rate to the control board as fifth state monitoring information.

[0073] S107 . The shutdown voltage spike monitoring module measures the voltage spike in the shutdown state according to the voltage peak value of the IGCT device in the shutdown phase, and transmits the voltage spike to the control board as the sixth state monitoring information.

[0074] The technical solution of the embodiment of the present invention, by setting a conduction voltage drop monitoring module, an off-state current monitoring module, an on and off delay time monitoring module, a voltage change rate monitoring module, a current change rate monitoring module, a shut-off voltage spike monitoring module, an electrical quantity acquisition module and a control board, the electrical quantity acquisition module can obtain the current and voltage of the IGCT device in the unit to be tested at each stage, and further transmit the current and / or voltage to each monitoring module, each monitoring module then measures multiple key parameters of the IGCT device in real time during operation according to the current and / or voltage, and further transmits each key parameter to the control board, and the control board then performs storage operations or control actions according to the values ​​of each key parameter. It can realize online monitoring of the state of the IGCT device, and then can monitor multiple key parameters of the IGCT device in real time, comprehensively evaluate the health state of the IGCT device, thereby improving the accuracy of the health state evaluation of the IGCT device, and then improving the safety of the IGCT device, ensuring the safe operation of the IGCT device, and is very suitable for application in high-power equipment based on IGCT.

[0075] It should be noted that, in the actual monitoring process, S102-S107 can be executed simultaneously.

[0076] Figure 5FIG. 1 is a flowchart of another online state monitoring method for an IGCT device according to an embodiment of the present invention. Figure 5 Based on the above embodiment, the online state monitoring method of the IGCT device includes:

[0077] S201. An electrical quantity acquisition module obtains electrical quantities of an IGCT device in a unit to be tested at each stage; wherein the electrical quantities include current and voltage.

[0078] S202 , the on-state voltage drop monitoring module measures the real-time current and on-state voltage drop according to the current and voltage of the IGCT device in the on-state phase, and transmits the real-time current and on-state voltage drop to the control board as the first state monitoring information.

[0079] S203 , the off-state current monitoring module measures the leakage current in the off-state according to the current of the IGCT device in the off-phase, and transmits the leakage current to the control board as the second state monitoring information.

[0080] S204, the turn-on and turn-off delay time monitoring module measures the turn-on delay time according to the command signal and the time required for the voltage of the IGCT device to decrease to a preset voltage value, and measures the turn-off delay time according to the command signal and the time required for the current of the IGCT device to decrease to a preset current value, and transmits the turn-on delay time and the turn-off delay time to the control board as the third state monitoring information.

[0081] Optionally, the stage in which the voltage of the IGCT device is reduced to a preset voltage value includes a stage in which the voltage drops to 90%; the stage in which the current of the IGCT device is reduced to a preset current value includes a stage in which the current drops to 40%; and the command signal includes an on-command signal and an off-command signal.

[0082] The on and off delay time monitoring module measures the on delay time according to the command signal and the time required for the voltage of the IGCT device to drop to the preset voltage value, including:

[0083] When the command signal is turned on, the on and off delay time monitoring module measures the time required for the voltage of the IGCT device to drop to 90% to obtain the on delay time.

[0084] The turn-off delay time is measured based on the time required for the command signal and the current of the IGCT device to decrease to a preset current value, including:

[0085] When the command signal is turned off, the on and off delay time monitoring module measures the time required for the current of the IGCT device to drop to 40% to obtain the off delay time.

[0086] S205 . The voltage change rate monitoring module measures the voltage change rate in the off state according to the voltage of the IGCT device in the off stage, and transmits the voltage change rate to the control board as the fourth state monitoring information.

[0087] S206 , the current change rate monitoring module measures the current change rate in the on state according to the current of the IGCT device in the on stage, and transmits the current change rate to the control board as the fifth state monitoring information.

[0088] S207 . The shutdown voltage spike monitoring module measures the voltage spike in the shutdown state according to the voltage peak value of the IGCT device in the shutdown phase, and transmits the voltage spike to the control board as the sixth state monitoring information.

[0089] S208. When any state monitoring information is abnormal, the control board controls the IGCT device to shut down.

[0090] Specifically, when any state monitoring information is abnormal, the control board outputs a shutdown command signal to the drive circuit of the IGCT device, so that the drive circuit is shut down, thereby shutting down the IGCT device. Through this setting, the IGCT device can be monitored and protected online at the same time, which can ensure the safe and reliable operation of the IGCT device, thereby preventing accidents.

[0091] According to another aspect of the present invention, a flexible DC-DC converter valve is provided, comprising the online state monitoring device for the IGCT device provided by any of the above embodiments. Therefore, the flexible DC-DC converter valve also has the beneficial effects of any of the above embodiments.

[0092] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0093] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An online status monitoring device for an IGCT device, characterized in that: include: On-state voltage drop monitoring module, off-state current monitoring module, on- and off-delay time monitoring module, voltage change rate monitoring module, current change rate monitoring module, off-state voltage spike monitoring module, electrical quantity acquisition module and control board; The electrical quantity acquisition module is connected to the IGCT device in the unit to be tested, and is used to obtain the electrical quantity of the IGCT device at each stage; wherein the electrical quantity includes current and voltage; The conduction voltage drop monitoring module is connected to the electrical quantity acquisition module, and is used to measure the real-time current and conduction voltage drop according to the current and voltage of the IGCT device in the conduction stage, and transmit them to the control board as the first state monitoring information; The off-state current monitoring module is connected to the electrical quantity acquisition module, and is used to measure the leakage current in the off state according to the current of the IGCT device in the off stage, and transmit it to the control board as the second state monitoring information; The control board is communicatively connected with the drive circuit in the unit to be tested, and is used to output a command signal to the unit to be tested. The on- and off-delay time monitoring module is respectively connected with the electrical quantity acquisition module and the drive circuit. The on- and off-delay time monitoring module is used to measure the on-delay time according to the command signal and the time required for the voltage of the IGCT device to decrease to a preset voltage value, and is used to measure the off-delay time according to the command signal and the time required for the current of the IGCT device to decrease to a preset current value, and transmit the on-delay time and the off-delay time to the control board as the third state monitoring information; The voltage change rate monitoring module is connected to the electrical quantity acquisition module, and is used to measure the voltage change rate in the off state according to the voltage of the IGCT device in the off stage, and transmit it to the control board as the fourth state monitoring information; The current change rate monitoring module is connected to the electrical quantity acquisition module, and is used to measure the current change rate in the on state according to the current of the IGCT device in the on stage, and transmit it to the control board as the fifth state monitoring information; The shutdown voltage spike monitoring module is connected to the electrical quantity acquisition module, and is used to measure the voltage spike in the shutdown state according to the voltage peak value of the IGCT device in the shutdown stage, and transmit it to the control board as the sixth state monitoring information.

2. The online status monitoring device of the IGCT device according to claim 1, characterized in that: The electrical quantity acquisition module includes: a current acquisition unit and a voltage acquisition unit; The input end of the current acquisition unit is connected to the IGCT device, and the output end of the current acquisition unit is respectively connected to the on-state voltage drop monitoring module, the off-state current monitoring module, the turn-on and turn-off delay time monitoring module and the current change rate monitoring module; the input end of the voltage acquisition unit is connected to the IGCT device, and the output end of the voltage acquisition unit is respectively connected to the on-state voltage drop monitoring module, the turn-on and turn-off delay time monitoring module, the voltage change rate monitoring module and the turn-off voltage spike monitoring module.

3. The online status monitoring device of the IGCT device according to claim 1, characterized in that: The control board is also used to control the IGCT device to shut down when any state monitoring information is abnormal.

4. The online status monitoring device of the IGCT device according to claim 1, characterized in that: The on-state voltage drop monitoring module, the off-state current monitoring module, the on- and off-delay time monitoring module, the voltage change rate monitoring module, the current change rate monitoring module and the off-state voltage spike monitoring module are independently integrated on a monitoring board.

5. The online status monitoring device of the IGCT device according to claim 1, characterized in that: The stage in which the voltage of the IGCT device is reduced to a preset voltage value includes a stage in which the voltage drops to 90%; the stage in which the current of the IGCT device is reduced to a preset current value includes a stage in which the current drops to 40%.

6. The online status monitoring device of the IGCT device according to claim 1, characterized in that: The command signal includes an on command signal and an off command signal; The on-command signal is associated with the on-delay time; the off-command signal is associated with the off-delay time.

7. An online state monitoring method for an IGCT device, characterized in that: include: The electrical quantity acquisition module acquires the electrical quantities of the IGCT device in the unit to be tested at each stage; wherein the electrical quantities include current and voltage; The conduction voltage drop monitoring module measures the real-time current and conduction voltage drop according to the current and voltage of the IGCT device in the conduction phase, and transmits the real-time current and conduction voltage drop to the control board as the first state monitoring information; The off-state current monitoring module measures the leakage current in the off-state according to the current of the IGCT device in the off-state phase, and transmits the leakage current to the control board as the second state monitoring information; The on- and off-delay time monitoring module measures the on-delay time according to the command signal and the time required for the voltage of the IGCT device to decrease to a preset voltage value, and measures the off-delay time according to the command signal and the time required for the current of the IGCT device to decrease to a preset current value, and transmits the on-delay time and the off-delay time to the control board as third state monitoring information; The voltage change rate monitoring module measures the voltage change rate in the off state according to the voltage of the IGCT device in the off stage, and transmits it to the control board as fourth state monitoring information; The current change rate monitoring module measures the current change rate in the on state according to the current of the IGCT device in the on stage, and transmits it to the control board as fifth state monitoring information; The turn-off voltage spike monitoring module measures the voltage spike in the turn-off state according to the voltage peak value of the IGCT device in the turn-off stage, and transmits the voltage spike to the control board as the sixth state monitoring information.

8. The method for online status monitoring of an IGCT device according to claim 7, characterized in that: Also includes: When any state monitoring information is abnormal, the control board controls the IGCT device to shut down.

9. The method for online status monitoring of an IGCT device according to claim 7, characterized in that: The stage in which the voltage of the IGCT device is reduced to a preset voltage value includes a stage in which the voltage is reduced to 90%; the stage in which the current of the IGCT device is reduced to a preset current value includes a stage in which the current is reduced to 40%; the command signal includes an on command signal and a off command signal; The on and off delay time monitoring module measures the on delay time according to the command signal and the time required for the voltage of the IGCT device to decrease to a preset voltage value, including: When the opening command signal is received, the opening and closing delay time monitoring module measures the time required for the voltage of the IGCT device to drop to 90% to obtain the opening delay time; Measuring the turn-off delay time according to the command signal and the time required for the current of the IGCT device to decrease to a preset current value, comprising: When the shutdown command signal is sent, the on and off delay time monitoring module measures the time required for the current of the IGCT device to drop to 40% to obtain the shutdown delay time.

10. A flexible direct current valve, characterized in that: An online status monitoring device for an IGCT device comprising the device described in any one of claims 1 to 6.

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