Power frequency phase pulse trigger control device, method and impulse voltage generation system

Abstract

The application discloses a power frequency phase pulse trigger control device and method and an impulse voltage generation system, relates to the field of overvoltage test and control of high-voltage insulation equipment, and the control module in the device is used for determining a current target phase and a corresponding target statistical time length; the second power frequency alternating voltage sampled and output by a power frequency voltage waveform collection module is subjected to signal zero-crossing detection so as to start timing when reaching a set zero-crossing point until the accumulated time length reaches the target statistical time length, a pulse output module is controlled to output a pulse signal, an impulse voltage generator is triggered to output a target impulse voltage, and the target impulse voltage is superposed on the power frequency alternating voltage used for test according to the target phase. The scheme can accurately and reliably superpose the impulse voltage on the impulse voltage according to any specified phase, the superposition phase is controllable, different overvoltage working conditions can be accurately constructed in the overvoltage test of GIS equipment, and the discharge fault of the GIS equipment under switch operation and lightning invasion can be prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of overvoltage test and control of high-voltage insulation equipment, in particular to a power frequency phase pulse trigger control device and method and an impulse voltage generation system. BACKGROUND

[0002] GIS equipment (Gas Insulated Switchgear) has been widely used in power systems due to its advantages of large transmission capacity, low loss, small floor area, and high safety and reliability. However, during the production, transportation and installation of GIS equipment, dust and metal particles are inevitably generated due to contact and collision. For slightly non-uniform fields inside the GIS equipment, the attachment of different types of particles will cause distortion of the electric field inside the GIS, resulting in local electric field concentration of the GIS equipment and reducing the insulation performance of the equipment.

[0003] At the same time, GIS equipment often faces overvoltage conditions during operation, such as lightning overvoltage and operating overvoltage during switch operation. Under the condition of superimposed overvoltage, latent metal particles are more likely to be activated and discharge, and under the working frequency alternating voltage, the discharge condition will continue to occur and further trigger breakdown, causing insulation failure of the GIS equipment. Considering the characteristics of short time and large energy of overvoltage in actual operation, the phase of superimposed alternating voltage also has randomness. Therefore, in order to clarify the movement and discharge characteristics of metal particles under the condition of overvoltage superimposed by power frequency alternating voltage and impulse voltage, an effective scheme is needed to actively control the superposition of impulse voltage and power frequency alternating voltage at any specified phase to obtain different overvoltage conditions, so as to facilitate the subsequent research on the characteristics of metal particles. SUMMARY

[0004] Therefore, the present application provides a power frequency phase pulse trigger control device, method and impulse voltage generation system, which can accurately and reliably superimpose impulse voltage at any specified phase, and the superimposed phase is controllable, which is beneficial to accurately constructing different overvoltage conditions in GIS equipment overvoltage test.

[0005] To solve the above technical problems, the present application provides a power frequency phase pulse trigger control device applied to an impulse voltage generation system, wherein the impulse voltage generation system comprises an impulse voltage generator, and the power frequency phase pulse trigger control device comprises a control module, a power frequency voltage waveform acquisition module and a pulse output module.

[0006] The input end of the power frequency voltage waveform acquisition module is connected with a power supply, and the output end is connected with the control module, for sampling a first power frequency alternating voltage output by the power supply to obtain a second power frequency alternating voltage;

[0007] The input end of the pulse output module is connected with the control module, and the output end is connected with the impulse voltage generator;

[0008] The control module is configured to determine a target phase according to a received setting signal, and determine a target statistical time length corresponding to the target phase; perform signal zero-crossing detection on the second power frequency alternating voltage so as to start timing when reaching a set zero-crossing point until the accumulated time length reaches the target statistical time length, control the pulse output module to output a pulse signal, so as to trigger the impulse voltage generator to output a target impulse voltage, so that the target impulse voltage is superimposed on the power frequency alternating voltage for testing according to the target phase.

[0009] Further, the pulse output module comprises a controllable switch and a first resistor;

[0010] One end of the first resistor serves as the input end of the pulse output module, and the other end is connected with the control end of the controllable switch;

[0011] The first end of the controllable switch is connected with a direct current power supply and serves as the output end of the pulse output module, and the second end is grounded.

[0012] Further, the power frequency phase pulse trigger control device further comprises a voltage conversion module and a voltage stabilizing module;

[0013] The power supply, the voltage conversion module and the voltage stabilizing module are connected in sequence, and the voltage conversion module is configured to convert the first power frequency alternating voltage output by the power supply into a direct current voltage;

[0014] The voltage stabilizing module is configured to stabilize the direct current voltage to a preset stable power supply direct current voltage.

[0015] Further, the power frequency phase pulse trigger control device further comprises a human-computer interaction module;

[0016] The human-computer interaction module is connected with the control module, and is configured to obtain a target phase set by a user to generate a corresponding setting signal and send the setting signal to the control module.

[0017] Further, the power frequency voltage waveform acquisition module comprises a voltage division and isolation module and a sampling resistor;

[0018] The input end of the voltage division isolation module is connected with a power supply, the output end is connected with one end of a sampling resistor, and the connected common end serves as the output end of the power frequency voltage waveform acquisition module, for sampling and reducing the first power frequency alternating voltage output by the power supply;

[0019] The other end of the sampling resistor is grounded.

[0020] Further, the power frequency voltage waveform acquisition module further comprises a bias superposition module.

[0021] The input end of the bias superposition module is connected with the output end of the voltage division isolation module and one end of the sampling resistor respectively, and the output end serves as the output end of the power frequency voltage waveform acquisition module, for performing bias superposition processing on the second power frequency alternating voltage according to the corresponding input voltage condition of the control module to output a third power frequency alternating voltage.

[0022] The control module is further used for performing debiasing processing on the received third power frequency alternating voltage to restore the second power frequency alternating voltage.

[0023] Further, the power frequency voltage waveform acquisition module further comprises a filtering module.

[0024] The input end of the filtering module is connected with the output end of the voltage division isolation module and one end of the sampling resistor respectively, and the output end is connected with the input end of the bias superposition module.

[0025] Further, the power frequency phase pulse trigger control device further comprises a crystal oscillator.

[0026] The crystal oscillator is connected with the control module, for providing a reference clock signal.

[0027] To solve the above technical problems, the application further provides a power frequency phase pulse trigger control method applied to the control module in the power frequency phase pulse trigger control device, and the power frequency phase pulse trigger control method comprises the following steps of:

[0028] determining a current target phase according to a received setting signal, and determining a target statistical time length corresponding to the target phase;

[0029] performing signal zero-crossing detection on a second power frequency alternating voltage output by a power frequency voltage waveform acquisition module in the power frequency phase pulse trigger control device, so as to start timing when reaching a set zero-crossing point;

[0030] when the accumulated time length reaches the target statistical time length, controlling a pulse output module to output a pulse signal, so as to trigger a target impulse voltage output by an impulse voltage generator to be superimposed on a power frequency alternating voltage for testing according to the target phase.

[0031] To solve the above technical problems, the application further provides an impulse voltage generation system, comprising an impulse voltage generator, and further comprising the power frequency phase pulse trigger control device as described above.

[0032] The power supply, the power frequency phase pulse trigger control device and the impulse voltage generator are sequentially connected.

[0033] The application provides a power frequency phase pulse trigger control device, method and impulse voltage generation system. The device comprises a control module, a power frequency voltage waveform acquisition module and a pulse output module. The power frequency voltage waveform acquisition module is used to sample a first power frequency alternating voltage output by a power supply to obtain a second power frequency alternating voltage. The control module is used to determine a current target phase according to a received setting signal, and determine a target statistical time length corresponding to the target phase. The second power frequency alternating voltage is subjected to signal zero-crossing detection so as to start timing when reaching a set target zero-crossing point and to control the pulse output module to output a pulse signal when the accumulated time length reaches the target statistical time length, so as to trigger the impulse voltage generator to output a target impulse voltage so that the target impulse voltage is superimposed on the power frequency alternating voltage for testing according to the target phase. It can be seen that the scheme can accurately and reliably superimpose the impulse voltage on the impulse voltage according to any specified phase, the superimposition phase is controllable, is suitable for a test scene of superimposing the impulse voltage on the power frequency alternating voltage, is beneficial to accurately constructing different overvoltage working conditions in GIS device overvoltage testing, is beneficial to better studying the movement and discharge characteristics of metal particles in the future, and is beneficial to preventing discharge faults of GIS devices under switch operation and lightning invasion.

[0034] The above description is only a summary of the technical scheme of the application. In order to more clearly understand the technical means of the application, the application can be implemented according to the content of the specification. In order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0035] The accompanying drawings described herein are used to provide further understanding of the application, and form a part of the application. The schematic embodiments of the application and the description thereof are used to explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0036] Figure 1 A structure schematic diagram of an impulse voltage generation system comprising a power frequency phase pulse trigger control device provided by the application;

[0037] Figure 2 A structure schematic diagram of a power frequency voltage waveform acquisition module provided by the application;

[0038] Figure 3A flow chart of a power frequency phase pulse trigger control method provided by the application. DETAILED DESCRIPTION

[0039] The core of the application is to provide a power frequency phase pulse trigger control device, method and impulse voltage generation system, which can accurately and reliably superimpose an impulse voltage on an impulse voltage according to any specified phase, and the superimposition phase is controllable, which is beneficial to accurately constructing different overvoltage working conditions in GIS equipment overvoltage testing.

[0040] The technical solutions in the embodiments of the application will be clearly described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the application.

[0041] The terms "first", "second", and the like in the specification and claims of the application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a category and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the objects before and after are in a "or" relationship.

[0042] Please refer to Figure 1 , Figure 1 A structure diagram of an impulse voltage generation system including a power frequency phase pulse trigger control device provided by the application.

[0043] The power frequency phase pulse trigger control device is applied to an impulse voltage generation system, the impulse voltage generation system includes an impulse voltage generator 5, and the power frequency phase pulse trigger control device includes a control module 2, a power frequency voltage waveform acquisition module 1 and a pulse output module 3.

[0044] The input end of the power frequency voltage waveform acquisition module 1 is connected with a power supply, and the output end is connected with the control module 2, for sampling a first power frequency alternating voltage output by the power supply to obtain a second power frequency alternating voltage;

[0045] The input end of the pulse output module 3 is connected with the control module 2, and the output end is connected with the impulse voltage generator 5;

[0046] The control module 2 is configured to determine a current target phase according to the received setting signal, and determine a target statistical duration corresponding to the target phase; perform signal zero-crossing detection on the second power frequency alternating voltage so as to start timing when reaching the set zero-crossing point and stop timing when the accumulated duration reaches the target statistical duration, and control the pulse output module 3 to output a pulse signal to trigger the impulse voltage generator 5 to output a target impulse voltage so that the target impulse voltage is superimposed on the power frequency alternating voltage for testing according to the target phase.

[0047] Specifically, the power supply herein is an alternating power supply to output a first power frequency alternating voltage, which is specifically a 220V, 50Hz alternating voltage; the frequency of the second power frequency alternating voltage is the same as that of the first power frequency alternating voltage, both of which are power frequency, i.e. 50Hz; and the effective value of the first power frequency alternating voltage is greater than that of the second power frequency alternating voltage, so as to avoid high voltage directly entering the control module 2 and achieve high voltage isolation; in addition, when the control module 2 has a corresponding input voltage condition, the second power frequency alternating voltage also needs to be subjected to bias superposition processing to output a third power frequency alternating voltage, and then be subjected to debiasing by the control module 2 to restore the second power frequency alternating voltage, which will be described in the following embodiments and will not be described here.

[0048] The target phase herein can be any specified phase. Considering that one cycle of the 50Hz power frequency alternating voltage is 0.02 seconds, 1° corresponds to a duration of 55.56 microseconds. The 55.56 microseconds is stored in advance as a duration determination basis. The way of determining the target statistical duration corresponding to the target phase can be that the product of the target phase and the duration determination basis stored in advance is the target statistical duration. For example, if the target phase is 90°, the corresponding target statistical duration is 90x55.56=5000.4 microseconds.

[0049] The second power frequency alternating voltage is essentially a signal with positive and negative, and has positive and negative zero-crossing points. The set zero-crossing point described in the present application is preferably the positive zero-crossing point. The positive zero-crossing point can be detected through signal zero-crossing detection. Herein, it is not specifically limited to starting timing from the time when the positive zero-crossing point is detected for the first time after the target statistical duration is determined, and can be flexibly set according to actual needs. When the accumulated duration reaches the target statistical duration, the pulse output module 3 outputs a pulse signal, and the impulse voltage generator 5 is configured to output an impulse voltage when triggered, so that the target impulse voltage is superimposed on the power frequency alternating voltage for testing according to the target phase.

[0050] More specifically, when the accumulated duration reaches the target statistical duration, the control module 2 can output a low-power trigger pulse signal (usually 3.3V or 5V logic level) to the pulse output module 3. The pulse output module 3 then amplifies the low-power trigger pulse signal to convert it into a high-power pulse signal that can drive the impulse voltage generator 5.

[0051] It should also be noted that a protection module 4 can be set up. The input terminal of the protection module 4 is connected to the output terminal of the pulse output module 3, and the output terminal is connected to the control terminal of the impulse voltage generator 5 to protect the circuit and devices and play an isolation role; more specifically, the protection module 4 can be an optocoupler.

[0052] In summary, this application provides a power frequency phase pulse triggering control device. This solution can accurately and reliably superimpose the impulse voltage onto the impulse voltage according to any specified phase. The superposition phase is controllable and it is suitable for test scenarios where power frequency AC voltage is superimposed on impulse voltage. This is beneficial for accurately constructing different overvoltage conditions in GIS equipment overvoltage testing, and for better subsequent research on the movement and discharge characteristics of metal particles. It is also beneficial for preventing discharge faults in GIS equipment under switching operations and lightning strikes.

[0053] Based on the above embodiments:

[0054] In some embodiments, the pulse output module 3 includes a controllable switch and a first resistor;

[0055] One end of the first resistor serves as the input terminal of the pulse output module 3, and the other end is connected to the control terminal of the controllable switch.

[0056] The first terminal of the controllable switch is connected to the DC power supply and serves as the output terminal of the pulse output module 3, while the second terminal is grounded.

[0057] In this embodiment, the above settings can achieve signal power amplification and isolation in a simple and reliable manner. Specifically, the controllable switch here includes, but is not limited to, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor). The first resistor is used for current limiting. The resistance value of the first resistor is not particularly limited and can be flexibly set according to the actual application and circuit safety requirements. In addition, a bidirectional Zener diode can be set between the gate and source of the MOSFET.

[0058] In some embodiments, the power frequency phase pulse triggering control device further includes a voltage conversion module and a voltage regulation module;

[0059] The power supply, voltage conversion module and voltage regulator module are connected in sequence. The voltage conversion module is used to convert the first power frequency AC voltage output by the power supply to output DC voltage.

[0060] The voltage stabilizing module is configured to stabilize the direct current voltage to a preset stable power supply direct current voltage.

[0061] In the embodiment, the voltage stabilizing module can provide reliable power supply for the power frequency phase pulse trigger control device. Specifically, the output end of the voltage stabilizing module can be connected with the power supply end of the control module 2, and the voltage conversion module can realize AC-DC conversion, so as to control the control module 2 to be an STM32F407VET6 single chip microcomputer. Here, the voltage conversion module can be an HLK-5M05 ultra-small series module power supply, so as to convert the first power frequency alternating current voltage into a 5V direct current voltage.

[0062] The voltage stabilizing module is configured to stabilize the direct current voltage to a preset stable power supply direct current voltage, that is, to ensure that the output voltage is stable regardless of the fluctuation of the input voltage within a certain range, so as to reliably supply power to the control module 2. The preset stable power supply direct current voltage corresponds to the power supply demand, and corresponds to the STM32F407VET6 single chip microcomputer. The preset stable power supply direct current voltage is 3.3V. Here, the voltage stabilizing module can be a low dropout regulator, such as an SPX3819M5-L-3-3 / TR voltage stabilizing chip. The 5V direct current voltage input can be reliably stabilized to a 3.3V preset stable power supply direct current voltage by the chip. In addition, the voltage stabilizing module can also include an input filter capacitor, an output filter capacitor, and a bypass capacitor. The input pin of the SPX3819M5-L-3-3 / TR voltage stabilizing chip is grounded through the input filter capacitor, the output pin is grounded through the output filter capacitor, and the bypass pin is grounded through the bypass capacitor. The above-mentioned capacitors are beneficial to filter out noise and ripple, so as to ensure that the SPX3819M5-L-3-3 / TR voltage stabilizing chip can provide stable and pure voltage output, and ensure that the output voltage is smooth and stable.

[0063] In some embodiments, the power frequency phase pulse trigger control device further comprises a human-computer interaction module.

[0064] The human-computer interaction module is connected with the control module 2, and is configured to obtain a target phase currently set by a user, so as to generate a corresponding setting signal and send it to the control module 2.

[0065] In the embodiment, the human-computer interaction module can reliably interact with the user. Specifically, the human-computer interaction module can be a serial display screen, which provides a human-computer interaction interface for the user to manually set the target phase. Of course, the target phase to be superimposed can also be realized in the form of a delay angle, so that the user can input the delay angle on the human-computer interaction interface.

[0066] Please refer to Figure 2 , Figure 2A structural schematic diagram of a power frequency voltage waveform acquisition module provided by the application.

[0067] In some embodiments, the power frequency voltage waveform acquisition module 1 comprises a voltage division isolation module 11 and a sampling resistor R5.

[0068] The input end of the voltage division isolation module 11 is connected with a power supply, and the output end is connected with one end of the sampling resistor R5, and the common end of the connection serves as the output end of the power frequency voltage waveform acquisition module 1, for performing voltage division sampling on the first power frequency alternating voltage output by the power supply.

[0069] The other end of the sampling resistor R5 is grounded.

[0070] In this embodiment, the voltage division isolation module 11 can perform voltage division sampling on the first power frequency alternating voltage belonging to high voltage (220V), in combination with the sampling resistor R5, to obtain a second power frequency alternating voltage of low voltage, which is a power frequency voltage in the range of -1.65V-1.65V. It can be seen that the above setting can realize isolation of high voltage and prevent high voltage from directly entering the subsequent module.

[0071] Specifically, the voltage division isolation module 11 can comprise a resistor voltage division network and a voltage transformer U1, as shown in Figure 2 The resistor voltage division network can comprise a second resistor R1, a third resistor R2, a fourth resistor R3 and a fifth resistor R4. The second resistor R1 and the fifth resistor R4 are connected in series, and one end of the circuit connected in series is connected with the power supply, and the other end of the circuit connected in series is connected with the first input end of the primary side of the voltage transformer U1. The third resistor R2 and the fourth resistor R3 are connected in series, and one end of the circuit connected in series is connected with the power supply, and the other end of the circuit connected in series is connected with the second input end of the primary side of the voltage transformer U1. The first output end of the secondary side of the voltage transformer U1 is connected with one end of the sampling resistor R5, and the second output end of the secondary side of the voltage transformer U1 is grounded. In addition, the voltage transformer U1 here can be a HPT205A precision current type voltage transformer.

[0072] In some embodiments, the power frequency voltage waveform acquisition module 1 further comprises a bias superposition module.

[0073] The input end of the bias superposition module is connected with the output end of the voltage division isolation module 11 and one end of the sampling resistor R5 respectively, and the output end serves as the output end of the power frequency voltage waveform acquisition module 1, for performing bias superposition processing on the second power frequency alternating voltage according to the corresponding input voltage condition of the control module 2 to output a third power frequency alternating voltage.

[0074] The control module 2 is further configured to perform debiasing processing on the received third power frequency alternating voltage to restore the second power frequency alternating voltage.

[0075] Specifically, the control module 2 in this application can be various microprocessors, such as the STM32F407VET6 microcontroller. Its corresponding input voltage condition, that is, the ADC (Analog-to-Digital Converter) acquisition voltage range is 0V to 3.3V. Therefore, the bias superposition module can be used to achieve bias superposition processing to obtain and output a third power frequency AC voltage in the range of 0V to 3.3V. The frequency of this third power frequency AC voltage is still the power frequency.

[0076] More specifically, the bias superposition module may include a sixth resistor R6, a seventh resistor R7, an eighth resistor R10, a feedback resistor R8, an input resistor R9, and an operational amplifier U2. One end of the sixth resistor R6 is grounded, and the other end of the sixth resistor R6 is connected to the sampling resistor R5, the output terminal of the voltage divider isolation module 11, one end of the seventh resistor R7, and one end of the eighth resistor R10. The other end of the seventh resistor R7 is connected to the DC power supply VCC (which can be taken from the output of the aforementioned voltage regulator module). The non-inverting input terminal of the operational amplifier U2 is connected to the other end of the eighth resistor R10, and the inverting input terminal of the operational amplifier U2 is connected to one end of the feedback resistor R8 and one end of the input resistor R9. The other end of the input resistor R9 is grounded (or...). Figure 2 As shown, the other end of the input resistor R9 is grounded through the second capacitor C2 (for filtering), the power supply terminal of operational amplifier U2 is connected to the DC power supply VCC, the ground terminal of operational amplifier U2 is grounded, and the output terminal of operational amplifier U2 is connected to control module 2 (or as shown). Figure 2 As shown, the output of operational amplifier U2 is connected to control module 2 via current-limiting resistor R11. It can be seen that with the above circuit structure, a 1.65V DC voltage can be superimposed on the DC power supply VCC for bias, and the gain of operational amplifier U2 can be adjusted to output a stable and high-precision third AC voltage that meets the input voltage conditions of control module 2. Control module 2 is also used to debias the received third AC voltage, eliminating the bias to restore the second AC voltage in the range of -1.65V to 1.65V. It should also be noted that the operational amplifier here includes, but is not limited to, the SGM358 operational amplifier.

[0077] In addition, the control module 2 selects the STM32F407VET6 single-chip microcomputer, and the STM32F407VET6 single-chip microcomputer has the advantages that the STM32F407VET6 single-chip microcomputer includes up to 15 channels of 12-bit analog-to-digital converters, and the sampling rate is up to 1Msps, so that the sampling requirement of the input signal can be well met; in addition, the control module 2 can further include a reset circuit, a reset pin of the STM32F407VET6 single-chip microcomputer is connected with an output end of the reset circuit, and the reset circuit can be an RC reset circuit, that is, the RC reset circuit includes a ninth resistor and a third capacitor, one end of the ninth resistor is connected with a direct current power supply VCC, the other end of the ninth resistor and one end of the third capacitor are connected with the reset pin of the STM32F407VET6 single-chip microcomputer, and the other end of the third capacitor is grounded, so that a reset signal is generated by using the charge-discharge characteristics of the capacitor; in addition, a plurality of fourth capacitors for filtering can be arranged at a power supply pin of the STM32F407VET6 single-chip microcomputer, and the power supply pin is grounded through the fourth capacitors.

[0078] In some embodiments, the power frequency voltage waveform acquisition module 1 further includes a filtering module;

[0079] The input end of the filtering module is connected with the output end of the voltage division and isolation module 11 and one end of the sampling resistor R5 respectively, and the output end is connected with the input end of the bias superposition module.

[0080] In the embodiment, the high-frequency noise can be effectively filtered out and the signal can be smoothed by the setting of the filtering module. Figure 2 The filtering module can include a first capacitor C1 and the sampling resistor R5 to form an RC filtering structure.

[0081] In some embodiments, the power frequency phase pulse trigger control device further includes a crystal oscillator.

[0082] The crystal oscillator is connected with the control module 2 and is used for providing a reference clock signal.

[0083] In the embodiment, the crystal oscillator is arranged outside the control module 2 to provide the reference clock signal, so that the phase control precision is improved, and specifically, the precision of the crystal oscillator is much higher than that of the internal clock of the control module 2, for example, the crystal oscillator can be an 8MHz crystal oscillator, the phase control of the power frequency 50Hz needs to achieve a resolution of 55.56 microseconds, and the high resolution of the external crystal oscillator can significantly reduce the quantization error, so that the control module 2 is provided with a high-stability and low-drift clock source, and accurate timing is ensured.

[0084] In addition, considering various delay conditions such as the delay response of the impulse voltage generator 5, the delay of the pulse signal output by the pulse output module 3, etc., in order to avoid cumulative errors, the reference clock provided by the crystal oscillator can also be used to accurately determine the inherent delay time length, and then the control module 2 determines the result of subtracting the inherent delay time length from the target statistical time length corresponding to the target phase after determining the target statistical time length, so as to realize compensation, and then completes the subsequent time length judgment according to the new target statistical time length, which is beneficial to more accurately ensure that the impulse voltage is superimposed on the power frequency alternating voltage according to the target phase. More specifically, the high-voltage probe and the digital oscilloscope can be used to synchronously capture the power frequency alternating voltage waveform and the impulse voltage waveform for testing, calculate the actual phase deviation, and then determine the inherent delay time length corresponding to the actual phase deviation in combination with the reference clock, and realize the writing of the inherent delay time length through the man-machine interaction module.

[0085] Please refer to Figure 3 , Figure 3 The flow chart of a power frequency phase pulse trigger control method provided by the application.

[0086] The power frequency phase pulse trigger control method is applied to the control module 2 in the power frequency phase pulse trigger control device described above, and the power frequency phase pulse trigger control method comprises the following steps.

[0087] S11: determining the current target phase according to the received setting signal, and determining the target statistical time length corresponding to the target phase;

[0088] S12: performing signal zero-crossing detection on the second power frequency alternating voltage output by the power frequency voltage waveform acquisition module 1 in the power frequency phase pulse trigger control device, so as to start timing when reaching the set zero-crossing point;

[0089] S13: when the cumulative time length reaches the target statistical time length, controlling the pulse output module 3 to output the pulse signal, so as to trigger the impulse voltage generator 5 to output the target impulse voltage to make the target impulse voltage superimposed on the power frequency alternating voltage for testing according to the target phase.

[0090] For the power frequency phase pulse trigger control method provided in the application, please refer to the above-mentioned embodiments of the power frequency phase pulse trigger control device, which will not be described here.

[0091] The application further provides an impulse voltage generation system, which comprises an impulse voltage generator 5, and further comprises the power frequency phase pulse trigger control device 6 described above.

[0092] The power supply, the power frequency phase pulse trigger control device 6 and the impulse voltage generator 5 are connected in sequence.

[0093] For the introduction of the impact voltage generation system provided in the present application, please refer to the above-mentioned embodiments of the power frequency phase pulse trigger control device, which will not be repeated here.

[0094] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant part can be referred to the method part. The relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including one" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0095] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power frequency phase impulse trigger control device, characterized in that, The device is applied to an impulse voltage generation system, which includes an impulse voltage generator. The power frequency phase pulse triggering control device includes a control module, a power frequency voltage waveform acquisition module, and a pulse output module. The input terminal of the power frequency voltage waveform acquisition module is connected to the power supply, and the output terminal is connected to the control module. It is used to sample the first power frequency AC voltage output by the power supply to obtain the second power frequency AC voltage. The input terminal of the pulse output module is connected to the control module, and the output terminal is connected to the impulse voltage generator. The control module is used to determine the current target phase according to the received set signal, and to determine the target statistical duration corresponding to the target phase. The method for determining the target statistical duration corresponding to the target phase is as follows: the target phase is determined by multiplying it by a pre-stored duration determination basis. For example, one cycle of a 50Hz power frequency AC voltage is 0.02 seconds, so the duration corresponding to 1° is 55.56 microseconds. This 55.56 microseconds is used as the duration determination basis and is pre-stored. The power frequency phase pulse triggering control device further includes a crystal oscillator; The crystal oscillator is connected to the control module and is used to provide a reference clock signal; The inherent delay duration is determined using the reference clock signal provided by the crystal oscillator. After the control module determines the target statistical duration corresponding to the target phase, the result of subtracting the inherent delay duration from the target statistical duration is determined as the new target statistical duration. Subsequent duration judgments are then performed based on the new target statistical duration. The second power frequency AC voltage is subjected to signal zero-crossing detection so that timing begins when a set zero-crossing point is reached and the accumulated time reaches the new target statistical time. Then, the pulse output module is controlled to output a pulse signal to trigger the impulse voltage generator to output a target impulse voltage so that the target impulse voltage is superimposed on the power frequency AC voltage used for testing according to the target phase.

2. The power frequency phase impulse trigger control device according to claim 1, wherein The pulse output module includes a controllable switch and a first resistor; One end of the first resistor serves as the input terminal of the pulse output module, and the other end is connected to the control terminal of the controllable switch; The first terminal of the controllable switch is connected to a DC power supply and serves as the output terminal of the pulse output module, while the second terminal is grounded.

3. The power frequency phase impulse trigger control device of claim 1, wherein, The power frequency phase pulse triggering control device also includes a voltage conversion module and a voltage regulation module; The power supply, the voltage conversion module, and the voltage regulator module are connected in sequence. The voltage conversion module is used to convert the first power frequency AC voltage output by the power supply to output DC voltage. The voltage regulator module is used to regulate the DC voltage to a preset stable power supply DC voltage.

4. The power frequency phase impulse trigger control device of claim 1, wherein, The power frequency phase pulse triggering control device also includes a human-machine interaction module; The human-computer interaction module is connected to the control module and is used to obtain the target phase currently set by the user, so as to generate a corresponding setting signal and send it to the control module.

5. The power frequency phase impulse triggering control device according to claim 1, wherein The power frequency voltage waveform acquisition module includes a voltage divider isolation module and a sampling resistor; The input end of the voltage division isolation module is connected with a power supply, the output end is connected with one end of a sampling resistor, and the connected common end serves as the output end of the power frequency voltage waveform acquisition module, for sampling and reducing the first power frequency alternating voltage output by the power supply; The other end of the sampling resistor is grounded.

6. The power frequency phase impulse triggering control device according to claim 5, wherein The power frequency voltage waveform acquisition module further comprises a bias superposition module; The input ends of the bias superposition module are respectively connected with the output ends of the voltage division isolation module and one end of the sampling resistor, and the output end serves as the output end of the power frequency voltage waveform acquisition module, for performing bias superposition processing on the second power frequency alternating voltage according to the corresponding input voltage condition of the control module to output a third power frequency alternating voltage; The control module is further used for performing debiasing processing on the received third power frequency alternating voltage to restore the second power frequency alternating voltage.

7. The power frequency phase impulse triggering control device according to claim 6, wherein The power frequency voltage waveform acquisition module further comprises a filtering module; The input ends of the filtering module are respectively connected with the output ends of the voltage division isolation module and one end of the sampling resistor, and the output end is connected with the input end of the bias superposition module.

8. A method for power frequency phase impulse trigger control, characterized in that, The control module applied to the power frequency phase pulse trigger control device, the power frequency phase pulse trigger control method, comprising: determining the current target phase according to the received setting signal, and determining the target statistical time length corresponding to the target phase; performing signal zero-crossing detection on the second power frequency alternating voltage output by the power frequency voltage waveform acquisition module in the power frequency phase pulse trigger control device, so as to start timing when reaching the set zero-crossing point; when the cumulative time length reaches the target statistical time length, controlling the pulse output module to output a pulse signal to trigger the impulse voltage generator to output a target impulse voltage so that the target impulse voltage is superimposed on the power frequency alternating voltage for testing according to the target phase.

9. An impulse voltage generating system characterized by comprising: The impulse voltage generator further comprises the power frequency phase pulse trigger control device according to any one of claims 1 to 7; The power supply, the power frequency phase pulse trigger control device, and the impulse voltage generator are sequentially connected.

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