CN214750616U - Converter valve on-line monitoring device - Google Patents
Converter valve on-line monitoring device Download PDFInfo
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- CN214750616U CN214750616U CN202120806395.XU CN202120806395U CN214750616U CN 214750616 U CN214750616 U CN 214750616U CN 202120806395 U CN202120806395 U CN 202120806395U CN 214750616 U CN214750616 U CN 214750616U
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Abstract
The utility model provides a pair of change of current valve on-line monitoring device, include: the monitoring circuit is used for monitoring the running state of a target converter valve and sending the running state to the control chip; the control chip is used for carrying out logic operation on the operation state, sending the operation state after the logic operation to the valve base electronic equipment through the communication return circuit, receiving a control instruction sent by the valve base electronic equipment through the communication return circuit, generating a corresponding control signal according to the control instruction and sending the control signal to the trigger circuit; the trigger circuit is used for controlling the action of the target converter valve according to the control signal. The running state of the target converter valve is monitored through the monitoring circuit, and the running state is sent to the valve base electronic equipment, so that an operator can monitor the running state of the extra-high voltage converter valve in real time, a fault point is positioned in time, and the running of the extra-high voltage converter station is more intelligent.
Description
Technical Field
The utility model relates to a direct current transmission technology field, concretely relates to change of current valve on-line monitoring device.
Background
At present, ultra-high voltage direct current transmission is used as a key technology for implementing a 'west-east power transmission' strategy, has the advantages of low transmission loss, small corridor width and the like, and can realize the transmission of ultra-long distance and ultra-large capacity power. The extra-high voltage converter valve is used as core equipment of the extra-high voltage direct current transmission system, and the operation reliability of the direct current transmission system is directly influenced by whether the extra-high voltage converter valve can normally work or not. Therefore, how to timely, comprehensively and accurately monitor the operation state of the extra-high voltage converter valve and effectively predict the potential fault risk becomes a key factor for ensuring the reliable operation of the direct current transmission system.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the defect that is difficult to monitor the running state of extra-high voltage converter valve among the prior art to a converter valve on-line monitoring device is provided.
In order to achieve the above purpose, the utility model provides a following technical scheme:
the embodiment of the utility model provides a change of current valve on-line monitoring device, include: the monitoring circuit is used for monitoring the running state of a target converter valve and sending the running state to the control chip; the control chip is used for carrying out logic operation on the operation state, sending the operation state after the logic operation to the valve base electronic equipment through the communication return circuit, receiving a control instruction sent by the valve base electronic equipment through the communication return circuit, generating a corresponding control signal according to the control instruction and sending the control signal to the trigger circuit; the trigger circuit is used for controlling the action of the target converter valve according to the control signal.
Optionally, the monitoring circuit includes: the energy acquisition circuit comprises an energy acquisition circuit and a working power supply monitoring circuit, wherein the input end of the energy acquisition circuit is connected with the power supply end of the target converter valve, and the output end of the energy acquisition circuit is respectively connected with the input end of the working power supply monitoring circuit and the power supply end of the control chip and used for supplying power to the converter valve online monitoring device through the control chip; the output end of the working power supply monitoring circuit is connected with the power supply monitoring end of the control chip and used for monitoring the power supply voltage of the energy taking circuit and sending the monitoring result to the control chip; and the control chip determines the working state of the energy taking circuit according to the monitoring result.
Optionally, the operating power supply monitoring circuit includes: the energy-taking circuit comprises a first diode, a first resistor, a second resistor, a third resistor and a first triode, wherein the forward end of the first diode is connected with the output end of the energy-taking circuit, and the reverse end of the first diode is connected with one end of the first resistor; the other end of the first resistor is respectively connected with one end of the second resistor and the control end of the first triode; the first end of the first triode is connected with the power monitoring end of the control chip, and the second end of the first triode is connected with one end of the third resistor; the other end of the third resistor is connected with the other end of the second resistor and then grounded.
Optionally, the monitoring circuit further includes: the current interruption protection circuit is used for monitoring the turn-off state of the thyristor in the target converter valve and sending the turn-off state to the control chip; the control chip generates a first control signal when the internal thyristor of the target converter valve is abnormally turned off, and triggers the internal thyristor of the target converter valve to be conducted again through the trigger circuit; the thyristor forward overvoltage protection circuit is used for monitoring voltage values at two ends of a thyristor in the target converter valve and sending the voltage values at the two ends of the thyristor to the control chip; the control chip generates a second control signal according to the relation between the voltage values at the two ends of the internal thyristor of the target converter valve and a first preset voltage value, and triggers the internal thyristor of the target converter valve to be conducted through the trigger circuit; the actual turn-off angle measuring circuit of the thyristor is used for monitoring the actual turn-off angle of the thyristor in the target converter valve and sending the actual turn-off angle to the control chip; and the control chip determines the commutation result of the target converter valve according to the relation between the actual turn-off angle and the preset turn-off angle.
Optionally, the monitoring circuit further includes: the thyristor reverse recovery protection circuit is used for monitoring a forward voltage value of a thyristor inside the target converter valve in a reverse recovery period and sending the forward voltage value to the control chip; and the control chip generates a third control signal according to the relation between the forward voltage value and a second preset voltage value, and controls the thyristor in the target converter valve to be turned off through the trigger circuit.
Optionally, the thyristor reverse recovery protection circuit includes: the energy-taking circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a non-logic gate and a second triode, wherein one end of the fourth resistor is connected with one end of a thyristor in the target converter valve, the other end of the fourth resistor is respectively connected with one end of the first capacitor, one end of the fifth resistor and the first end of the second triode, the other end of the first capacitor is respectively connected with the other end of the fifth resistor and the second end of the second triode and then grounded, one end of the sixth resistor is connected with the output end of the energy-taking circuit, the other end of the sixth resistor is respectively connected with the third end of the second triode and the input end of the non-logic gate, and the output end of the non-logic gate is connected with the reverse power supply monitoring end of the control chip.
Optionally, the monitoring circuit further includes: the damping loop state monitoring circuit is used for monitoring the damping loop current of the target converter valve and sending the damping loop current to the control chip; and the control chip determines the operation state of the damping loop of the target converter valve according to the relation between the current of the damping loop and the current of a preset damping loop.
Optionally, the damping loop condition monitoring circuit includes: thyristor level damping circuit, voltage follower circuit, half peak value sample hold circuit and voltage comparator, wherein, thyristor level damping circuit's output with voltage follower circuit's input is connected, voltage follower circuit's first output with voltage comparator's first input is connected, voltage follower circuit's second output with half peak value sample hold circuit's input is connected, half peak value sample hold circuit's output with voltage comparator's second input is connected, voltage comparator's output with control chip connects.
Optionally, the monitoring circuit further includes: the voltage-sharing resistor state monitoring circuit is used for monitoring the voltage change rate of the voltage-sharing resistor of the target converter valve and sending the voltage change rate to the control chip; and the control chip determines the running state of the voltage-sharing resistor according to the relation between the voltage value change rate and the preset voltage value change rate.
Optionally, the voltage-sharing resistance state monitoring circuit includes: the voltage comparator comprises a seventh resistor, an eighth resistor, a ninth resistor, a second diode, a third diode, a fourth diode and a voltage comparator, wherein one end of the seventh resistor is connected with one end of the eighth resistor, the other end of the seventh resistor is connected with one end of the second diode, the other end of the eighth resistor is connected with one end of the third diode, the other end of the third diode is connected with one end of the fourth diode, the other end of the fourth diode is respectively connected with the input end of the voltage comparator and one end of the ninth resistor, and the other end of the ninth resistor is connected with the other end of the second diode and then grounded.
The utility model discloses technical scheme has following advantage:
the utility model provides a change of current valve on-line monitoring device, include: the monitoring circuit is used for monitoring the running state of a target converter valve and sending the running state to the control chip; the control chip is used for carrying out logic operation on the operation state, sending the operation state after the logic operation to the valve base electronic equipment through the communication return circuit, receiving a control instruction sent by the valve base electronic equipment through the communication return circuit, generating a corresponding control signal according to the control instruction and sending the control signal to the trigger circuit; the trigger circuit is used for controlling the action of the target converter valve according to the control signal. The running state of the target converter valve is monitored through the monitoring circuit, and the running state is sent to the valve base electronic equipment, so that an operator can monitor the running state of the extra-high voltage converter valve in real time, a fault point is positioned in time, and the running of the extra-high voltage converter station is more intelligent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic block diagram of a specific example of an online monitoring device for a converter valve in an embodiment of the present invention;
fig. 2 is a schematic block diagram of another specific example of the converter valve online monitoring device in the embodiment of the present invention;
fig. 3 is a +60V power monitoring circuit in the embodiment of the present invention;
FIG. 4 is an embodiment of the present invention, in which a +12V power monitoring circuit is provided;
fig. 5 is a schematic block diagram of another specific example of the converter valve online monitoring device in the embodiment of the present invention;
fig. 6 is a schematic diagram of measuring actual turn-off angle of the thyristor in the embodiment of the present invention;
fig. 7 is a reverse recovery protection circuit of the thyristor in the embodiment of the present invention;
FIG. 8 is a circuit for monitoring the state of the damping circuit according to an embodiment of the present invention;
fig. 9 is a circuit for monitoring the state of the voltage-sharing resistor according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
An embodiment of the utility model provides a change of current valve on-line monitoring device is applied to change of current valve monitoring occasion. As shown in fig. 1, the converter valve on-line monitoring device includes: the converter valve monitoring system comprises a control chip 1, and a monitoring circuit 2, a communication return circuit 3 and a trigger circuit 4 which are connected with the control chip 1, wherein the monitoring circuit 2 is used for monitoring the running state of a target converter valve and sending the running state to the control chip 1; the control chip 1 is used for carrying out logic operation on the operation state, sending the operation state after the logic operation to the valve base electronic equipment through the communication return circuit 3, receiving a control instruction sent by the valve base electronic equipment through the communication return circuit 3, generating a corresponding control signal according to the control instruction and sending the control signal to the trigger circuit 4; the trigger circuit 4 is used for controlling the action of the target converter valve according to the control signal.
In a specific embodiment, the monitoring circuit 2 sends the monitored operating state of the target converter valve to the control chip 1. The control chip 1 performs data processing and logic judgment on the operation state of the target converter valve according to the logic of the control chip, and completes the summary processing of all the acquired information. The control chip 1 sends the running state after the logic operation to the valve base electronic equipment through the communication return circuit 3. And the valve base electronic equipment generates a control instruction according to the running state of the target converter valve and sends the control instruction to the control chip 1 through the communication return circuit 3. The control chip 1 generates a corresponding control signal according to the control instruction and sends the control signal to the trigger circuit 4, and the control signal is used for controlling the action of the target converter valve, so that various protections, actual turn-off angle measurement and on-line monitoring of the upper-layer transmission thyristor are realized.
In the embodiment of the present invention, the trigger circuit 4 is a core function of the converter valve on-line monitoring device, and is a trigger function for completing the thyristor according to a trigger command of a valve base electronic device (VBE). The control chip 1 adopts a high-performance programmable FPGA chip to perform data processing and logic judgment, and completes the important software functions of summarizing all collected information, decoding communication codes, receiving instructions of an upper layer to trigger a thyristor, realizing various protections, actually measuring a turn-off angle, sending on-line monitoring data of the thyristor to the upper layer and the like.
The utility model provides a change of current valve on-line monitoring device, include: the monitoring circuit is used for monitoring the running state of a target converter valve and sending the running state to the control chip; the control chip is used for carrying out logic operation on the operation state, sending the operation state after the logic operation to the valve base electronic equipment through the communication return circuit, receiving a control instruction sent by the valve base electronic equipment through the communication return circuit, generating a corresponding control signal according to the control instruction and sending the control signal to the trigger circuit; the trigger circuit is used for controlling the action of the target converter valve according to the control signal. The running state of the target converter valve is monitored through the monitoring circuit, and the running state is sent to the valve base electronic equipment, so that an operator can monitor the running state of the extra-high voltage converter valve in real time, a fault point is positioned in time, and the running of the extra-high voltage converter station is more intelligent.
In one embodiment, as shown in fig. 2, the monitoring circuit 2 includes: the energy obtaining circuit 21 and the working power supply monitoring circuit 22, wherein the input end of the energy obtaining circuit 21 is connected with the power supply end of the target converter valve, and the output end of the energy obtaining circuit is respectively connected with the input end of the working power supply monitoring circuit 22 and the power supply end of the control chip 1, and is used for supplying power to the converter valve online monitoring device through the control chip 1; the output end of the working power supply monitoring circuit 22 is connected with the power supply monitoring end of the control chip 1 and is used for monitoring the power supply voltage of the energy-taking circuit 21 and sending the monitoring result to the control chip 1; the control chip 1 determines the working state of the energy-taking circuit 21 according to the monitoring result.
In a specific embodiment, the design power consumption of the converter valve on-line monitoring device is 12-15 mA, and the energy storage capacitor is 240 uF. When the thyristor level voltage is 110Vrms (50 Hz). The high-capacity energy taking and energy storage circuit can completely meet the operation requirement. Specifically, a) the AC system fails single phase to ground, and the failed phase voltage drops to 0 for a duration of at least 0.7 seconds. b) And the three phases of the alternating current system are short-circuited to the ground, and the voltage is reduced to 30% of the normal voltage and the duration is at least 0.7 second. c) And the three phase earth metal short circuit faults of the alternating current system are reduced to 0, and the duration is at least 0.2 second. In addition, the energy taking circuit 21 meets the requirement of rapid energy taking when the valve is subjected to operation impulse voltage, lightning impulse voltage and steep wave impulse voltage. Therefore, the energy taking circuit 21 can provide energy for the forward overvoltage protection action of the thyristor, the pre-charging process of the converter valve on-line monitoring device is reduced, and the operation program of the converter valve on-line monitoring device is reduced. In the embodiment of the present invention, the energy obtaining circuit 21 can also be connected to other device power supply terminals to obtain electric energy, which is not limited herein.
In one embodiment, the working power supply of the converter valve on-line monitoring device is divided into two voltage levels of +60V and + 12V. The +12V power supply is obtained by converting a +60V power supply, the +60V power supply is also used by the thyristor trigger amplifying circuit, and the +12V power supply is used by the logic circuit of the circuit board. The working power supply of the converter valve on-line monitoring device is divided into two voltage grades. Accordingly, the operating power supply monitoring circuit 22 has two kinds of monitoring circuits. In the embodiment of the present invention, when the operating power supply of the converter valve on-line monitoring device is +60V, the operating power supply monitoring circuit 22 is as shown in fig. 3. Specifically, the operating power supply monitoring circuit 22 includes: a first diode D21, a first resistor R56, a second resistor R59, a third resistor R62 and a first triode Q12, wherein the forward end of the first diode D21 is connected to the output end of the energy extracting circuit 21, and the reverse end of the first diode D21 is connected to one end of the first resistor R56; the other end of the first resistor R56 is connected to one end of the second resistor R59 and the control end of the first transistor Q12, respectively; a first end of a first triode Q12 is connected with a power monitoring end of the control chip 1, and a second end of a first triode Q12 is connected with one end of a third resistor R62; the other end of the third resistor R62 is connected with the other end of the second resistor R59 and then grounded.
Further, when the +60V power voltage is greater than +23V, the D21 voltage regulator tube is conducted, the base level of the triode Q12 is changed from low level to high level, the triode is conducted, the +60V _ Check signal is changed into high level, the signal is switched into the control chip 1(FPGA) after level conversion, and the FPGA judges that the +60V _ Check signal is continuous for 20ms high level and then considers that the +60V power can be normally obtained.
In the embodiment of the present invention, when the working power supply of the converter valve on-line monitoring device is +12V, the working power supply monitoring circuit 22 is as shown in fig. 4. Specifically, the operating power supply monitoring circuit 22 includes: an eleventh diode D22, an eleventh resistor R57, a twelfth resistor R60, a thirteenth resistor R63 and an eleventh triode Q13, wherein a forward terminal of the eleventh diode D22 is connected to the output terminal of the energy extracting circuit 21, and a reverse terminal of the eleventh diode D22 is connected to one terminal of the eleventh resistor R57; the other end of the eleventh resistor R57 is connected to one end of the twelfth resistor R60 and the control end of the eleventh transistor Q13, respectively; a first end of an eleventh triode Q13 is connected with a power monitoring end of the control chip 1, and a second end of the eleventh triode Q13 is connected with one end of a thirteenth resistor R63; the other end of the thirteenth resistor R63 is connected with the other end of the twelfth resistor R60 and then grounded.
Further, when the +12V power voltage is greater than +9V, the D22 voltage regulator tube is conducted, the base level of the triode Q13 is changed from low level to high level, the triode is conducted, the +12V _ Check signal is changed into high level, the signal is switched into the control chip 1(FPGA) after level conversion, and the FPGA judges that the +12V _ Check signal is continuous for 20ms high level and then considers that the +12V power can be normally obtained.
When the +60V power supply is larger than 23V, the trigger circuit has enough energy to trigger the thyristor, so that the FPGA can output a trigger signal when the +60V _ Check signal and the +12V _ Check signal are both high; when the +60V and +12V power supply voltages meet the requirements and the forward voltage of the thyristor level reaches 36V, the converter valve on-line monitoring device needs to send a single pulse signal as a normal energy taking return.
In one embodiment, as shown in fig. 5, the monitoring circuit 2 further includes: the current interruption protection circuit 23, the thyristor forward overvoltage protection circuit 24 and the thyristor actual turn-off angle measurement circuit 25, wherein the current interruption protection circuit 23 is used for monitoring the turn-off state of the thyristor in the target converter valve and sending the turn-off state to the control chip 1; the control chip 1 generates a first control signal when the internal thyristor of the target converter valve is abnormally turned off, and triggers the internal thyristor of the target converter valve to be conducted again through the trigger circuit 4; the thyristor forward overvoltage protection circuit 24 is used for monitoring voltage values at two ends of a thyristor in the target converter valve and sending the voltage values at the two ends of the thyristor to the control chip 1; the control chip 1 generates a second control signal according to the relation between the voltage values at the two ends of the internal thyristor of the target converter valve and the first preset voltage value, and triggers the internal thyristor of the target converter valve to be conducted through the trigger circuit 4; the actual turn-off angle measuring circuit 25 of the thyristor is used for monitoring the actual turn-off angle of the thyristor in the target converter valve and sending the actual turn-off angle to the control chip 1; the control chip 1 determines a phase conversion result of the target converter valve according to the relation between the actual turn-off angle and the preset turn-off angle.
In one embodiment, the current interrupt protection circuit 23 means that the thyristor should be triggered to conduct again if the thyristor is abnormally turned off (current interrupted) within 120 ° after the thyristor is triggered to conduct. And the valve base electronic equipment (VBE) sends a double-pulse signal and a single-pulse signal to the converter valve online monitoring device to be used as a start trigger mark and a stop trigger mark. The method comprises the steps that after a converter valve on-line monitoring device receives a correct double-pulse signal, a trigger signal is generated and sent to a thyristor, a current interrupted protection trigger function is started at the same time, a current interrupted protection trigger state is kept until the converter valve on-line monitoring device receives a single pulse for stopping triggering, if the converter valve on-line monitoring device detects that the thyristor is abnormally turned off, a first control signal is generated, and the thyristor is triggered by current interrupted protection.
Further, in the thyristor forward overvoltage protection circuit 24, when the voltage at the two ends of the thyristor enters the on-line monitoring device of the converter valve and the thyristor is detected, the voltage division processing is firstly carried out, then the voltage values are compared, if the voltage at the two ends of the thyristor is greater than a first preset voltage value (overvoltage protection threshold value), a second control signal is generated, the trigger circuit 4 is directly started, trigger pulses are generated, the thyristor is conducted, and the thyristor is prevented from being damaged by overvoltage.
Further, the actual turn-off angle of the thyristor refers to the time of bearing reverse voltage in the turn-off process of the thyristor, and if the actual turn-off angle is too small, the risk of phase commutation failure exists. Therefore, the function of resisting commutation failure can be realized by measuring the actual turn-off angle of the thyristor. The converter valve on-line monitoring device can measure the actual turn-off angle gamma of the thyristor by using the actual turn-off angle measuring circuit 25 of the thyristor, and the actual turn-off angle can be calculated by obtaining the time difference from the reverse voltage born by the two ends to the forward voltage born by the two ends through timing, as shown in fig. 6. In the embodiment of the present invention, the current interruption protection circuit 23, the thyristor forward overvoltage protection circuit 24, and the actual turn-off angle measurement circuit 25 of the thyristor all adopt the existing circuit structure, and are not described herein again.
In one embodiment, as shown in fig. 5, the monitoring circuit 2 further includes: the thyristor reverse recovery protection circuit 26 is used for monitoring a forward voltage value of a thyristor inside the target converter valve in a reverse recovery period and sending the forward voltage value to the control chip 1; the control chip 1 generates a third control signal according to the relation between the forward voltage value and the second preset voltage value, and controls the thyristor inside the target converter valve to be turned off through the trigger circuit 4.
In one embodiment, as shown in fig. 7, the thyristor reverse recovery protection circuit 26 includes: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a non-logic gate U1 and a second triode Q2, wherein one end of the fourth resistor R4 is connected to one end of a thyristor inside the target converter valve, the other end of the fourth resistor R4 is connected to one end of the first capacitor C1, one end of the fifth resistor R5 and the first end of the second triode Q2, the other end of the first capacitor C1 is connected to the other end of the fifth resistor R5 and the second end of the second triode Q2, and then grounded, one end of the sixth resistor R6 is connected to the output end of the enable circuit 21, the other end of the sixth resistor R6 is connected to the third end of the second triode Q2 and the input end of the non-logic gate U1, and the output end of the non-logic gate U1 is connected to the reverse power supply end of the control chip 1.
The embodiment of the utility model provides an in, the thyristor is-20V by on-state to thyristor reverse voltage, and converter valve on-line monitoring device starts reverse recovery protection, and in the reverse recovery period, thyristor forward voltage surpassed second preset voltage value (protection level), and control chip 1 generates the third control signal to automatic triggering thyristor after reverse recovery timer to the settlement time. Specifically, reverse recovery period time determination: the turn-off time tq of the thyristor mainly depends on the reverse voltage, the reverse current peak value, the turn-off time and the junction temperature Tj of the thyristor. The most suitable reverse recovery period time should be determined according to the dc engineering.
In one embodiment, as shown in fig. 5, the monitoring circuit 2 further includes: the damping loop state monitoring circuit 27 is used for monitoring the damping loop current of the target converter valve and sending the damping loop current to the control chip 1; the control chip 1 determines the operation state of the damping loop of the target converter valve according to the relation between the current of the damping loop and the current of the preset damping loop.
In a specific embodiment, the damping loop status monitoring circuit 27 includes two branches Rd and Rx, the post-stage monitoring circuits of the two branches are completely the same, and only the resistance values of the sampling resistors are different, and fig. 8 only takes the monitoring circuit of the branch Rd as an example for description. Specifically, as shown in fig. 8, the damping-loop state monitoring circuit 27 includes: thyristor level damping circuit, voltage follower circuit, half peak value sample hold circuit and voltage comparator, wherein, thyristor level damping circuit's output is connected with voltage follower circuit's input, voltage follower circuit's first output is connected with voltage comparator's first input, voltage follower circuit's second output is connected with half peak value sample hold circuit's input, half peak value sample hold circuit's output is connected with voltage comparator's second input, voltage comparator's output and control chip 1 are connected.
In the embodiment of the present invention, the anti-serial diode D11/D24 is used to ensure the normal operation of the circuit such as the post-stage energy-taking circuit; the sampling resistor R33/R68 converts the current signal of the damping branch circuit into a voltage signal; the voltage value enters a voltage comparator formed by the TL331 after passing through a voltage follower circuit and a half-peak value sampling and holding circuit, and when the real-time voltage value is less than half of the maximum value, the output of the TL331 is changed from high level to low level. And finally, the output signal enters the FPGA, the FPGA obtains the time for the damping loop current to be attenuated to a half value from the maximum value through a timer, judges whether the damping loop has a fault, generates a periodic return signal and sends the periodic return signal to the valve base electronic equipment.
In one embodiment, as shown in fig. 5, the monitoring circuit 2 further includes: the voltage-sharing resistance state monitoring circuit 28 is used for monitoring the voltage change rate of the voltage-sharing resistance of the target converter valve and sending the voltage change rate to the control chip 1; the control chip 1 determines the operation state of the voltage-sharing resistor according to the relation between the voltage value change rate and the preset voltage value change rate.
In an embodiment, as shown in fig. 9, the voltage-equalizing resistance state monitoring circuit 2 includes: the voltage comparator comprises a seventh resistor Rj1, an eighth resistor Rj2, a ninth resistor R20, a second diode D28, a third diode D2, a fourth diode D3 and a voltage comparator, wherein one end of the seventh resistor Rj1 is connected with one end of the eighth resistor Rj2, the other end of the seventh resistor Rj1 is connected with one end of the second diode D28, the other end of the eighth resistor Rj2 is connected with one end of the third diode D2, the other end of the third diode D2 is connected with one end of the fourth diode D3, the other end of the fourth diode D3 is respectively connected with an input end of the voltage comparator and one end of the ninth resistor R20, and the other end of the ninth resistor R20 is connected with the other end of the second diode D28 and then grounded.
The embodiment of the utility model provides an in, the principle of voltage-sharing resistance state monitoring is through at voltage-sharing branch road series resistance, measures the time that the voltage on this resistance rises to 1.2V from 0, calculates the voltage value rate of change. And determining the running state of the voltage-sharing resistor according to the relation between the voltage value change rate and the preset voltage value change rate. And when the voltage value change rate is greater than the preset voltage value change rate, considering the voltage-sharing resistor to be normal, otherwise, considering the voltage-sharing resistor to be abnormal. As shown in fig. 9, in the voltage-sharing resistance state monitoring circuit 2, R20 is a voltage-dividing resistance; the TL331 is a voltage comparator, and when the voltage division value of the voltage-sharing branch is greater than 1.2V, the output of the TL331 changes from low level to high level. The output signal finally enters the FPGA, the FPGA obtains the time that the voltage value on the voltage-sharing loop divider resistor rises to 1.2V through the timer, then the voltage value change rate is calculated, whether the voltage-sharing resistor breaks down or not is judged according to the relation between the voltage value change rate and the preset voltage value change rate, and a periodic return signal is generated and sent to the valve base electronic equipment.
In one embodiment, the converter valve on-line monitoring device uploads monitoring information of the thyristor-level loop to the valve-based electronic device through the function of the communication reporting circuit 3. According to the characteristics of the monitoring information, the method can be divided into three types of different return information: periodic reporting, real-time reporting and actual turn-off angle reporting.
Firstly, periodic reporting: the period of the state signal of the thyristor-level loop is 20ms, and the state signal is constantly reported no matter whether the positive zero crossing point of the voltage at the two ends of the thyristor occurs displacement or not at each time. The periodic reporting signal mainly includes:
1)60V power state reporting;
2)12V power state reporting;
3) monitoring the state of an Rd damping branch;
4) monitoring the state of an Rx damping branch circuit;
5) and monitoring the state of the voltage equalizing resistor.
Secondly, real-time reporting: the method mainly aims at signals needing to be fed back to the valve base electronic equipment in real time, and the signals are reported immediately once the state changes, and no change or no report is given. The real-time reporting signal mainly comprises:
1) normal energy taking and returning;
2) current intermittent trigger reporting;
3) returning by a single pulse;
4) forward over-voltage protection reporting;
5) reverse recovery protection reporting.
Thirdly, returning the actual turn-off angle: the measured actual turn-off angle of the thyristor is reported to valve base electronic equipment, a measured value is obtained every 20ms, and the reporting time is after periodic reporting.
The communication protocol reported back is shown in table 1. Three frames are adopted to respectively correspond to three types of return, and the return is distinguished through bits 7-6 of a first word; the first 8 high bits of each frame of data are heartbeat signals, so that the intelligent TTM board side is prevented from stopping running and is used for judging whether a frame is lost or not; 5 real-time report signals are distinguished in the real-time report frame in a coding mode; the last word of each frame is a check code, so that the reliability of communication data is improved.
TABLE 1 reward communication protocol
In one embodiment, the communication reporting circuit 3 is an optical-to-electrical conversion circuit. The photoelectric conversion circuit is used for converting optical signals into electric signals or converting the electric signals into optical signals, so that the optical fiber communication between the converter valve online monitoring device and the valve base electronic equipment is realized. Specifically, the communication rewarding circuit 3 includes an optical transmitting circuit and an optical receiving circuit, wherein the optical transmitting circuit and the optical receiving circuit respectively adopt self-designed circuits based on the OPF372A and the OPF520, and have the advantage of small power loss while realizing reliable photoelectric conversion.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.
Claims (10)
1. The utility model provides a change of current valve on-line monitoring device which characterized in that includes: a control chip, and a monitoring circuit, a communication report circuit and a trigger circuit connected with the control chip,
the monitoring circuit is used for monitoring the running state of a target converter valve and sending the running state to the control chip;
the control chip is used for carrying out logic operation on the operation state, sending the operation state after the logic operation to the valve base electronic equipment through the communication return circuit, receiving a control instruction sent by the valve base electronic equipment through the communication return circuit, generating a corresponding control signal according to the control instruction and sending the control signal to the trigger circuit;
the trigger circuit is used for controlling the action of the target converter valve according to the control signal.
2. The converter valve on-line monitoring device according to claim 1, wherein the monitoring circuit comprises: an energy taking circuit and a working power supply monitoring circuit, wherein,
the input end of the energy-taking circuit is connected with the power supply end of the target converter valve, and the output end of the energy-taking circuit is respectively connected with the input end of the working power supply monitoring circuit and the power supply end of the control chip and used for supplying power to the converter valve online monitoring device through the control chip;
the output end of the working power supply monitoring circuit is connected with the power supply monitoring end of the control chip and used for monitoring the power supply voltage of the energy taking circuit and sending the monitoring result to the control chip;
and the control chip determines the working state of the energy taking circuit according to the monitoring result.
3. The converter valve on-line monitoring device according to claim 2, wherein the operating power monitoring circuit comprises: a first diode, a first resistor, a second resistor, a third resistor and a first triode,
the positive end of the first diode is connected with the output end of the energy taking circuit, and the reverse end of the first diode is connected with one end of the first resistor;
the other end of the first resistor is respectively connected with one end of the second resistor and the control end of the first triode;
the first end of the first triode is connected with the power monitoring end of the control chip, and the second end of the first triode is connected with one end of the third resistor;
the other end of the third resistor is connected with the other end of the second resistor and then grounded.
4. The converter valve on-line monitoring device according to claim 1, wherein the monitoring circuit further comprises: a current interruption protection circuit, a thyristor forward overvoltage protection circuit and a thyristor actual turn-off angle measurement circuit, wherein,
the current interrupted protection circuit is used for monitoring the turn-off state of a thyristor in the target converter valve and sending the turn-off state to the control chip;
the control chip generates a first control signal when the internal thyristor of the target converter valve is abnormally turned off, and triggers the internal thyristor of the target converter valve to be conducted again through the trigger circuit;
the thyristor forward overvoltage protection circuit is used for monitoring voltage values at two ends of a thyristor in the target converter valve and sending the voltage values at the two ends of the thyristor to the control chip;
the control chip generates a second control signal according to the relation between the voltage values at the two ends of the internal thyristor of the target converter valve and a first preset voltage value, and triggers the internal thyristor of the target converter valve to be conducted through the trigger circuit;
the actual turn-off angle measuring circuit of the thyristor is used for monitoring the actual turn-off angle of the thyristor in the target converter valve and sending the actual turn-off angle to the control chip;
and the control chip determines the commutation result of the target converter valve according to the relation between the actual turn-off angle and the preset turn-off angle.
5. The converter valve on-line monitoring device according to claim 2, wherein the monitoring circuit further comprises: the thyristor reverse recovery protection circuit is used for monitoring a forward voltage value of a thyristor inside the target converter valve in a reverse recovery period and sending the forward voltage value to the control chip;
and the control chip generates a third control signal according to the relation between the forward voltage value and a second preset voltage value, and controls the thyristor in the target converter valve to be turned off through the trigger circuit.
6. The converter valve on-line monitoring device according to claim 5, wherein the thyristor reverse recovery protection circuit comprises: a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a non-logic gate and a second triode,
one end of the fourth resistor is connected with one end of a thyristor in the target converter valve, the other end of the fourth resistor is respectively connected with one end of the first capacitor, one end of the fifth resistor and the first end of the second triode, the other end of the first capacitor is respectively connected with the other end of the fifth resistor and the second end of the second triode and then grounded, one end of the sixth resistor is connected with the output end of the energy obtaining circuit, the other end of the sixth resistor is respectively connected with the third end of the second triode and the input end of the non-logic gate, and the output end of the non-logic gate is connected with the reverse power monitoring end of the control chip.
7. The converter valve on-line monitoring device according to claim 1, wherein the monitoring circuit further comprises: the damping loop state monitoring circuit is used for monitoring the damping loop current of the target converter valve and sending the damping loop current to the control chip;
and the control chip determines the operation state of the damping loop of the target converter valve according to the relation between the current of the damping loop and the current of a preset damping loop.
8. The converter valve on-line monitoring device according to claim 7, wherein the damping loop state monitoring circuit comprises: a thyristor level damping circuit, a voltage follower circuit, a half-peak sample-and-hold circuit, and a voltage comparator,
the output end of the thyristor-level damping circuit is connected with the input end of the voltage follower circuit, the first output end of the voltage follower circuit is connected with the first input end of the voltage comparator, the second output end of the voltage follower circuit is connected with the input end of the half-peak value sampling and holding circuit, the output end of the half-peak value sampling and holding circuit is connected with the second input end of the voltage comparator, and the output end of the voltage comparator is connected with the control chip.
9. The converter valve on-line monitoring device according to claim 1, wherein the monitoring circuit further comprises: the voltage-sharing resistor state monitoring circuit is used for monitoring the voltage change rate of the voltage-sharing resistor of the target converter valve and sending the voltage change rate to the control chip;
and the control chip determines the running state of the voltage-sharing resistor according to the relation between the voltage value change rate and the preset voltage value change rate.
10. The converter valve on-line monitoring device according to claim 9, wherein the voltage equalizing resistance state monitoring circuit comprises: a seventh resistor, an eighth resistor, a ninth resistor, a second diode, a third diode, a fourth diode and a voltage comparator,
one end of the seventh resistor is connected with one end of the eighth resistor, the other end of the seventh resistor is connected with one end of the second diode, the other end of the eighth resistor is connected with one end of the third diode, the other end of the third diode is connected with one end of the fourth diode, the other end of the fourth diode is respectively connected with the input end of the voltage comparator and one end of the ninth resistor, and the other end of the ninth resistor is connected with the other end of the second diode and then grounded.
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| CN202120806395.XU CN214750616U (en) | 2021-04-20 | 2021-04-20 | Converter valve on-line monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115015729A (en) * | 2022-06-30 | 2022-09-06 | 中国电力科学研究院有限公司 | Test loop, method and system for checking performance of thyristor converter valve and damping loop of thyristor converter valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115015729A (en) * | 2022-06-30 | 2022-09-06 | 中国电力科学研究院有限公司 | Test loop, method and system for checking performance of thyristor converter valve and damping loop of thyristor converter valve |
| CN115015729B (en) * | 2022-06-30 | 2024-03-22 | 中国电力科学研究院有限公司 | Test loop, method and system for checking performance of thyristor converter valve and damping loop thereof |
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