CN109888763B - Disconnection detection and protection method for power module redundancy energy-taking circuit - Google Patents
Disconnection detection and protection method for power module redundancy energy-taking circuit Download PDFInfo
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Abstract
The application provides a method for detecting and protecting disconnection of a redundant energy-taking circuit of a power module. The method comprises the following steps: the voltage sampling control unit detects the voltage of the direct-current energy storage capacitor and the voltage of the bypass energy storage capacitor; comparing the voltage of the bypass energy storage capacitor with a first overvoltage threshold value; responding to the voltage of the bypass energy storage capacitor larger than a first overvoltage threshold value, and judging that the second resistor has a disconnection fault; triggering the first power semiconductor switch to be conducted, so that the bypass energy storage capacitor discharges through the bypass trigger coil and the first power semiconductor switch, the contact of the bypass switch is closed, the power semiconductor unit quits operation, and the direct-current energy storage capacitor stops charging; and repeatedly controlling the first power semiconductor switch to be switched on or switched off until the voltage of the direct current energy storage capacitor is lower than the first overvoltage threshold value. The power module redundancy energy-taking circuit can quickly identify the broken line and bypass the broken line, continuously protects the overvoltage condition, avoids fault expansion, is not provided with a circuit, is simple and reliable, and has strong practicability.
Description
Technical Field
The application relates to the field of extra-high voltage alternating current and direct current power transmission, in particular to a method for detecting and protecting a broken line of a redundant energy-taking circuit of a power module.
Background
The cascade multilevel converter is widely applied to occasions of electric power, rail transit and new energy such as extra-high voltage alternating current and direct current transmission, reactive compensation, direct current distribution networks and the like. In order to improve the reliability of the fault bypass of the power module, avoid fault expansion, maintain the continuous operation of the system and avoid economic loss, a redundant energy-taking technology is mostly introduced into the power module.
The conventional design has a cross energy-taking scheme, namely, the power supply boards of adjacent power modules are connected to the adjacent modules, so that the problem that the single module cannot be started after a fault is avoided. However, this solution increases the mutual coupling between modules, which is likely to cause the fault to be amplified.
There are also two high voltage power strips installed inside a single module to increase redundancy, but this solution not only increases the cost of the power module, but also increases the losses of the system, the complex design of the high voltage power strips implying low reliability.
CN109167507A proposes a resistor voltage-dividing energy-taking scheme, which utilizes a voltage-sharing resistor in a module to reduce the input voltage range of a redundant energy-taking power supply, greatly simplifies the design of the power supply, and does not increase the loss of a power module. However, the applicant finds that the resistor voltage division has the defect that when the disconnection fault of the lower-end resistor occurs, the input voltage of the redundant power supply is higher and higher along with the charging of the RC, so that the redundant power supply is damaged, and even the fault of the whole module is caused.
Disclosure of Invention
The power module fault detection and protection method aims at overcoming the defect of input overvoltage faults caused by disconnection of the energy taking resistor in the power module adopting the resistor voltage division energy taking scheme, the method is used for rapidly detecting the disconnection of the resistor, and the bypass module is used for inhibiting the voltage rise of a disconnection point so as to achieve the purposes of protecting the module and avoiding fault tripping.
The embodiment of the application provides a method for detecting and protecting the disconnection of a power module redundant energy taking circuit, wherein the power module redundant energy taking circuit comprises a power semiconductor unit, a direct-current energy storage capacitor, a high-voltage power supply board, a control board, a bypass switch and a redundant energy taking unit; the control panel comprises a voltage sampling control unit, a redundant power supply and a first power semiconductor switch; the bypass switch comprises a bypass energy storage capacitor, a bypass trigger coil and a bypass switch contact; the redundant energy-extracting unit comprises a first resistor and a second resistor which are connected in series, and the method comprises the following steps: the voltage sampling control unit detects the voltage of the direct current energy storage capacitor and the voltage of the bypass energy storage capacitor; comparing the detected voltage of the bypass energy storage capacitor with a first overvoltage threshold; in response to the voltage of the bypass energy storage capacitor being greater than the first overvoltage threshold, determining that the second resistor has a disconnection fault; triggering the first power semiconductor switch to be conducted, so that the bypass energy storage capacitor discharges through the bypass trigger coil and the first power semiconductor switch, the contact of the bypass switch is closed, the power semiconductor unit quits operation, and the direct-current energy storage capacitor stops charging; and repeatedly controlling the first power semiconductor switch to be switched on or switched off until the voltage of the direct current energy storage capacitor is lower than the first overvoltage threshold value.
As an aspect of the present invention, the repeatedly controlling the first power semiconductor switch to be turned on or off includes: keeping the first power semiconductor switch conductive, so that the direct current energy storage capacitor discharges through the first resistor, the bypass trigger coil and the first power semiconductor switch; the first power semiconductor switch is turned off in response to the control board being powered down or the current passing through the first power semiconductor switch being lower than a holding current, and the direct-current energy storage capacitor continues to charge the bypass energy storage capacitor through the first resistor until the voltage of the bypass energy storage capacitor exceeds a first overvoltage threshold; and triggering the first power semiconductor switch to be conducted, so that the bypass energy storage capacitor is discharged through the bypass trigger coil and the first power semiconductor switch.
As one aspect of the present invention, the first power semiconductor switch turning off in response to the control board being powered down or the current through the first power semiconductor switch being below a maintenance current, comprises: the first power semiconductor switch is an IGBT, and the first power semiconductor switch is turned off in response to the power failure of the control board; the first power semiconductor switch is a thyristor, the first power semiconductor switch turns off in response to the current through the first power semiconductor switch being below a holding current.
As an aspect of the present invention, before the voltage sampling control unit detects the voltage of the dc energy storage capacitor and the voltage of the bypass energy storage capacitor, the method further includes: the control board is started in response to the voltage of the bypass energy storage capacitor being higher than the high-voltage power supply board starting threshold voltage; the direct-current energy storage capacitor is charged by the power semiconductor unit, and the bypass energy storage capacitor is charged by the direct-current energy storage capacitor through the first resistor.
As an aspect of the present invention, the high voltage power board start threshold voltage is lower than the first overvoltage threshold.
As an aspect of the present invention, before the voltage sampling control unit detects the voltage of the dc energy-storage capacitor and the voltage of the bypass energy-storage capacitor when the high voltage power board fails, the method further includes: the control board starts in response to the voltage of the bypass energy storage capacitor being higher than a redundant power supply starting threshold voltage; the direct-current energy storage capacitor is charged by the power semiconductor unit, and the bypass energy storage capacitor is charged by the direct-current energy storage capacitor through the first resistor.
As one aspect of the invention, the redundant power supply activation threshold voltage is lower than the first over-voltage threshold.
As an aspect of the present invention, when the high voltage power board fails, the redundant power supply is activated or deactivated in response to the voltage of the bypass energy storage capacitor exceeding or falling below the redundant power supply activation threshold voltage.
As an aspect of the present invention, the method further comprises: when the voltage of the direct current energy storage capacitor exceeds a second voltage threshold value and the redundant power supply loses power, the first resistor is judged to have a disconnection fault; protection is performed according to the redundant power supply fault state.
As an aspect of the present invention, the voltage division of the second voltage threshold at the second resistor is a redundant power supply activation threshold voltage.
The method provided by the embodiment of the application aims at the problem of disconnection of the lower end resistor of the redundant energy-taking circuit of the power module, the disconnection detection and protection method is provided, the disconnection can be rapidly identified, the bypass is carried out, meanwhile, the overvoltage condition of the disconnection point is continuously protected until the module quits the system operation, the fault expansion of the module is avoided, partial hardware of a bypass switch is fully utilized, the protection purpose is achieved under the condition that a hardware circuit is not additionally added, the method is simple and reliable, the implementability is strong, and the engineering performance is high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating a power module redundant power-taking circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart illustrating a method for detecting and protecting a disconnection of a redundant power-taking circuit of a power module according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram illustrating sub-steps of step S150 of the method provided in the embodiment of FIG. 2;
fig. 4 is a schematic flow chart of a method for detecting and protecting a power module redundancy energy-taking circuit high-voltage power board in case of failure according to another embodiment of the present application;
fig. 5 is a schematic diagram illustrating the sub-steps of step S250 of the method provided in the embodiment of fig. 4.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, specific embodiments of the technical solutions of the present application will be described in more detail and clearly in the following with reference to the accompanying drawings and the embodiments. However, the specific embodiments and examples described below are for illustrative purposes only and are not limiting of the present application. It is intended that the present disclosure includes only some embodiments and not all embodiments, and that other embodiments may be devised by those skilled in the art with various modifications as fall within the scope of the appended claims.
The method provided by the application is a disconnection detection and protection method for a redundant energy-taking circuit of a power module.
Fig. 1 is a schematic diagram of a power module redundant energy obtaining circuit according to an embodiment of the present disclosure, including a power semiconductor unit 1, a dc energy storage capacitor C1, a high voltage power board 2, a control board 3, a bypass switch 5, and a redundant energy obtaining unit 4.
A dc storage capacitor C1 is connected in parallel with the power semiconductor unit 1. The high-voltage power supply board 2 takes energy from the direct-current energy storage capacitor C1 and supplies the energy to the control board 3 and the bypass switch 5. The control board 3 includes a voltage sampling control unit 31, a redundant power supply 32, and a first power semiconductor switch Q1.
The bypass switch 5 comprises a bypass energy storage capacitor C2, a bypass trigger coil L1 and a bypass switch contact K1, the bypass switch contact K1 is connected with the power semiconductor unit 1 in parallel, one end of the bypass trigger coil L1 is connected to the anode of the bypass energy storage capacitor C2, and the other end of the bypass trigger coil L1 is connected to one end of a first power semiconductor device Q1.
The redundant energy-taking unit 4 comprises a first resistor R1 and a second resistor R2 which are connected in series, one end of the first resistor R1 is connected to the anode of the direct-current energy-storing capacitor C1, and one end of the second resistor R2 is connected to the cathode of the direct-current energy-storing capacitor C1; the series connection point of the first resistor R1 and the second resistor R2 is connected to the positive electrode of the bypass energy storage capacitor C2 through the first diode D1, the negative electrode of the bypass energy storage capacitor C2 is connected to the negative electrode collection point of the control board 3, the negative electrode collection point of the control board 3 is connected to the negative electrode of the direct current energy storage capacitor C1, the redundant power supply 32 obtains electricity through the voltage division of the second resistor R2, and the power is supplied to the voltage sampling control unit 31 when the high-voltage power supply board 2 fails.
The first power semiconductor switch Q1 includes, but is not limited to, a thyristor, an insulated gate bipolar transistor, or a solid state switch.
Fig. 2 is a schematic flow chart of a method for detecting and protecting a disconnection of a redundant power-taking circuit of a power module according to an embodiment of the present disclosure, which includes the following steps.
In step S110, the voltage sampling control unit 31 detects the voltage of the dc energy storage capacitor C1 and the voltage of the bypass energy storage capacitor C2.
The voltage sampling control unit 31 works normally after the control board 3 is started, and detects the voltage of the direct current energy storage capacitor C1 and the voltage of the bypass energy storage capacitor C2.
And the process of starting the control panel 3 is as follows: the power semiconductor unit 1 charges the direct current energy storage capacitor C1, and the direct current energy storage capacitor C1 charges the bypass energy storage capacitor C2 through the first resistor R1. When the voltage of the bypass energy storage capacitor C2 is higher than the starting threshold voltage of the high-voltage power supply board 2, the high-voltage power supply board 2 works to supply power to the control board 3, and the control board 3 is started.
When the high voltage power supply board 2 normally works, the control board is powered by the high voltage power supply board 2, and the redundant power supply 32 is in a standby state.
In step S120, the voltage sampling control unit 31 compares the detected voltage of the bypass energy storage capacitor C2 with the first overvoltage threshold V1.
In step S130, in response to the voltage of the bypass energy storage capacitor C2 being greater than the first overvoltage threshold V1, it is determined that the second resistor R2 has an open-circuit fault.
When the first resistor R1 is broken, the large damage is not caused, and the redundant power supply is generally just power-off and cannot be started. When the voltage sampling control unit 31 detects that the voltage of the direct-current energy storage capacitor C1 exceeds the second voltage threshold V4 and the redundant power supply 32 loses power, it is determined that the first resistor R1 has a disconnection fault, and the voltage sampling control unit 31 performs protection according to the fault state of the redundant power supply 32.
The voltage of the second voltage threshold V4 divided by the second resistor R2 is the start threshold voltage V3 of the redundant power supply 32.
When the second resistor R2 is disconnected, the input voltage of the redundant power supply 32 will be higher and higher along with the RC charging, which results in the damage of the redundant power supply 32 and even causes the failure of the whole module, so that the detection and protection are important.
In order to enable the high-voltage power supply board to normally start and work, power is supplied to the control board to enable the control board to normally work, and the first overvoltage threshold value V1 is larger than the starting threshold voltage V2 of the high-voltage power supply board.
In step S140, the voltage sampling control unit 31 triggers the first power semiconductor switch Q1 to turn on, so that the bypass energy storage capacitor C2 discharges through the bypass trigger coil L1 and the first power semiconductor switch Q1, the bypass switch contact K1 is closed, the power semiconductor unit 1 exits from operation, and the dc energy storage capacitor C1 stops charging.
As soon as the bypass energy storage capacitor C2 begins to discharge, the bypass switch contact K1 is closed and the power semiconductor unit 1 exits operation.
In step S150, the first power semiconductor switch Q1 is repeatedly controlled to turn on or off until the voltage of the dc storage capacitor C1 is lower than the first overvoltage threshold V1.
Fig. 3 is a schematic view of sub-steps of step S150 of the method provided in the embodiment of fig. 2, and as shown in fig. 3, in step S150, the step of repeatedly controlling the first power semiconductor switch to be turned on or off includes the following sub-steps.
In step S151, the first power semiconductor switch Q1 is kept turned on, so that the dc storage capacitor C1 discharges through the first resistor R1, the bypass trigger coil L1, and the first power semiconductor switch Q1.
In step S152, the first power semiconductor switch Q1 is turned off in response to the control board 3 being powered down or the current through the first power semiconductor switch Q1 being lower than the holding current, and the dc storage capacitor C1 continues to charge the bypass storage capacitor C2 through the first resistor R1 until the voltage of the bypass storage capacitor C2 exceeds the first overvoltage threshold V1.
Wherein the first power semiconductor switch Q1 is turned off in response to the control board 3 being powered down or the current through the first power semiconductor switch Q1 being below the standby current, including the following two cases.
When the first power semiconductor switch Q1 is an IGBT, then the first power semiconductor switch Q1 turns off in response to the control board 3 powering down.
When the first power semiconductor switch Q1 is a thyristor, then the first power semiconductor switch Q1 turns off in response to the current through the first power semiconductor switch Q1 being below the holding current.
In step S153, the first power semiconductor switch Q1 is triggered to conduct, so that the bypass energy storage capacitor C2 discharges through the bypass trigger coil L1 and the first power semiconductor switch Q1.
And repeating the steps S151, S152 and S153 until the voltage of the direct current energy storage capacitor C1 is lower than the first overvoltage threshold V1.
The method provided by the embodiment can quickly identify the broken line and carry out the bypass, and simultaneously carries out continuous protection on the overvoltage condition appearing at the broken line point until the module exits from the system operation, thereby avoiding the fault expansion of the module, fully utilizing partial hardware of the bypass switch, achieving the protection purpose under the condition of not additionally increasing a hardware circuit, and being simple and reliable, strong in implementability and high in engineering property.
Fig. 4 is a schematic flow chart of a method for detecting and protecting a power module redundancy energy-taking circuit high-voltage power board in case of a fault according to another embodiment of the present application.
In the embodiment, when the high-voltage power supply board fails, the disconnection detection and protection method comprises the following steps.
In step S210, the voltage sampling control unit 31 detects the voltage of the dc energy storage capacitor C1 and the voltage of the bypass energy storage capacitor C2.
The voltage sampling control unit 31 works normally after the control board 3 is started, and detects the voltage of the direct current energy storage capacitor C1 and the voltage of the bypass energy storage capacitor C2.
And the process that the control panel 3 starts when the high-voltage power supply panel fails is as follows: the power semiconductor unit 1 charges the direct current energy storage capacitor C1, and the direct current energy storage capacitor C1 charges the bypass energy storage capacitor C2 through the first resistor R1. When the voltage of the bypass energy storage capacitor C2 is higher than the start threshold voltage V3 of the redundant power supply 32, the redundant power supply 32 starts to supply power to the control board 3, and the control board 3 starts.
In step S220, the voltage sampling control unit 31 compares the detected voltage of the bypass energy storage capacitor C2 with the first overvoltage threshold V1.
In step S230, in response to the voltage of the bypass energy storage capacitor C2 being greater than the first overvoltage threshold V1, it is determined that the second resistor R2 has an open-circuit fault.
When the first resistor R1 is broken, the large damage is not caused, and the redundant power supply is generally just power-off and cannot be started. When the voltage sampling control unit 31 detects that the voltage of the direct-current energy storage capacitor C1 exceeds the second voltage threshold V4 and the redundant power supply 32 loses power, it is determined that the first resistor R1 has a disconnection fault, and the voltage sampling control unit 31 performs protection according to the fault state of the redundant power supply 32.
The voltage of the second voltage threshold V4 divided by the second resistor R2 is the start threshold voltage V3 of the redundant power supply 32.
When the second resistor R2 is disconnected, the input voltage of the redundant power supply 32 will be higher and higher along with the RC charging, which results in the damage of the redundant power supply 32 and even causes the failure of the whole module, so that the detection and protection are important.
In order to enable the redundant power supply 32 to operate normally, the first overvoltage threshold V1 is greater than the redundant power supply start threshold V3.
In step S230, the voltage sampling control unit 31 triggers the first power semiconductor switch Q1 to turn on, so that the bypass energy storage capacitor C2 discharges through the bypass trigger coil L1 and the first power semiconductor switch Q1, the bypass switch contact K1 is closed, the power semiconductor unit 1 exits from operation, the dc energy storage capacitor C1 stops charging, and the redundant power supply 32 stops operating when it is powered down.
As soon as the bypass energy storage capacitor C2 begins to discharge, the bypass switch contact K1 is closed and the power semiconductor unit 1 exits operation.
In step S240, the first power semiconductor switch Q1 is repeatedly controlled to turn on or off until the voltage of the dc storage capacitor C1 is lower than the first overvoltage threshold V1.
Fig. 5 is a schematic view of sub-steps of step S250 of the method provided in the embodiment of fig. 4, and as shown in fig. 5, in step S250, the step of repeatedly controlling the first power semiconductor switch to be turned on or off includes the following sub-steps.
In step S251, the first power semiconductor switch Q1 is kept turned on, so that the dc storage capacitor C1 discharges through the first resistor R1, the bypass trigger coil L1, and the first power semiconductor switch Q1.
In step S252, the first power semiconductor switch Q1 is turned off in response to the control board 3 being powered down or the current passing through the first power semiconductor switch Q1 being lower than the holding current, the dc storage capacitor C1 continues to charge the bypass storage capacitor C2 through the first resistor R1, when the voltage of the bypass storage capacitor C2 reaches the start threshold voltage V3 of the redundant power supply 32, the redundant power supply 32 is started again, and the control board starts operation again until the voltage of the bypass storage capacitor C2 exceeds the first overvoltage threshold V1.
Wherein the first power semiconductor switch Q1 is turned off in response to the control board 3 being powered down or the current through the first power semiconductor switch Q1 being below the standby current, including the following two cases.
When the first power semiconductor switch Q1 is an IGBT, then the first power semiconductor switch Q1 turns off in response to the control board 3 powering down.
When the first power semiconductor switch Q1 is a thyristor, then the first power semiconductor switch Q1 turns off in response to the current through the first power semiconductor switch Q1 being below the holding current.
In step S253, the first power semiconductor switch Q1 is triggered to turn on, so that the bypass energy storage capacitor C2 discharges through the bypass trigger coil L1 and the first power semiconductor switch Q1, and the redundant power supply 32 is powered down and stopped.
And repeating the steps S251, S252 and S253 until the voltage of the direct current energy storage capacitor C1 is lower than the first overvoltage threshold V1.
According to the method provided by the embodiment, when the high-voltage power supply board fails, the disconnection can be rapidly identified and the bypass is performed when the redundant power supply works, meanwhile, the overvoltage condition of the disconnection point is continuously protected until the module quits the system operation, the fault expansion of the module is avoided, partial hardware of the bypass switch is fully utilized, the protection purpose is achieved under the condition that a hardware circuit is not additionally added, and the method is simple, reliable, strong in implementability and high in engineering performance.
It should be noted that the above-mentioned embodiments described with reference to the drawings are only intended to illustrate the present application and not to limit the scope of the present application, and those skilled in the art should understand that modifications or equivalent substitutions made on the present application without departing from the spirit and scope of the present application should be included in the scope of the present application. Furthermore, unless the context indicates otherwise, words that appear in the singular include the plural and vice versa. Additionally, all or a portion of any embodiment may be utilized with all or a portion of any other embodiment, unless stated otherwise.
Claims (9)
1. A power module redundant energy taking circuit is provided with a power semiconductor unit, a direct-current energy storage capacitor, a high-voltage power supply board, a control board, a bypass switch and a redundant energy taking unit; the control panel comprises a voltage sampling control unit, a redundant power supply and a first power semiconductor switch; the bypass switch comprises a bypass energy storage capacitor, a bypass trigger coil and a bypass switch contact; the redundant energy-extracting unit comprises a first resistor and a second resistor which are connected in series, and the method comprises the following steps:
the voltage sampling control unit detects the voltage of the direct current energy storage capacitor and the voltage of the bypass energy storage capacitor;
comparing the detected voltage of the bypass energy storage capacitor with a first overvoltage threshold;
in response to the voltage of the bypass energy storage capacitor being greater than the first overvoltage threshold, determining that the second resistor has a disconnection fault;
triggering the first power semiconductor switch to be conducted, so that the bypass energy storage capacitor discharges through the bypass trigger coil and the first power semiconductor switch, the contact of the bypass switch is closed, the power semiconductor unit quits operation, and the direct-current energy storage capacitor stops charging;
repeatedly controlling the first power semiconductor switch to be switched on or switched off until the voltage of the direct current energy storage capacitor is lower than the first overvoltage threshold; wherein the repeatedly controlling the first power semiconductor switch to turn on or off comprises:
keeping the first power semiconductor switch conductive, so that the direct current energy storage capacitor discharges through the first resistor, the bypass trigger coil and the first power semiconductor switch;
the first power semiconductor switch is turned off in response to the control board being powered down or the current passing through the first power semiconductor switch being lower than a holding current, and the direct-current energy storage capacitor continues to charge the bypass energy storage capacitor through the first resistor until the voltage of the bypass energy storage capacitor exceeds a first overvoltage threshold;
and triggering the first power semiconductor switch to be conducted, so that the bypass energy storage capacitor is discharged through the bypass trigger coil and the first power semiconductor switch.
2. The method of claim 1, wherein the first power semiconductor switch turns off in response to the control board powering down or a current through the first power semiconductor switch being below a holding current, comprising:
the first power semiconductor switch is an IGBT, and the first power semiconductor switch is turned off in response to the power failure of the control board; or
The first power semiconductor switch is a thyristor, the first power semiconductor switch turns off in response to the current through the first power semiconductor switch being below a holding current.
3. The method of claim 1, wherein before the voltage sampling control unit detects the voltage of the dc energy storage capacitor and the voltage of the bypass energy storage capacitor, further comprising:
the control board is started in response to the voltage of the bypass energy storage capacitor being higher than the high-voltage power supply board starting threshold voltage; the direct-current energy storage capacitor is charged by the power semiconductor unit, and the bypass energy storage capacitor is charged by the direct-current energy storage capacitor through the first resistor.
4. The method of claim 3, wherein the high voltage power supply board activation threshold voltage is below the first over-voltage threshold.
5. The method of claim 1, wherein before the voltage sampling control unit detects the voltage of the dc energy storage capacitor and the voltage of the bypass energy storage capacitor when the high voltage power supply board fails, the method further comprises:
the control board starts in response to the voltage of the bypass energy storage capacitor being higher than a redundant power supply starting threshold voltage; the direct-current energy storage capacitor is charged by the power semiconductor unit, and the bypass energy storage capacitor is charged by the direct-current energy storage capacitor through the first resistor.
6. The method of claim 5, wherein the redundant power supply activation threshold voltage is below the first over-voltage threshold.
7. The method of claim 1, wherein upon failure of the high voltage power strip, the redundant power supply is activated or de-energized in response to the voltage of the bypass energy storage capacitor exceeding or falling below the redundant power supply activation threshold voltage.
8. The method of claim 1, wherein the method further comprises:
comparing the detected voltage of the direct current energy storage capacitor with a second voltage threshold;
in response to the voltage of the direct-current energy storage capacitor being greater than the second voltage threshold value and the redundant power supply losing power, determining that the first resistor has a disconnection fault;
protection is performed according to the redundant power supply fault state.
9. The method of claim 8, wherein the voltage division of the second voltage threshold across the second resistor is a redundant power supply enable threshold voltage.
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| CN110808606B (en) * | 2019-12-09 | 2023-10-20 | 南方电网科学研究院有限责任公司 | Overvoltage protection circuit for power module of flexible direct current transmission and converter valve |
| CN113497545B (en) * | 2020-04-08 | 2022-06-28 | 南京南瑞继保工程技术有限公司 | IGCT driving device, IGCT module, electronic equipment and control method |
| CN115173690B (en) * | 2022-08-12 | 2024-05-24 | 广东电网有限责任公司广州供电局 | Bypass switch trigger circuit and detection method |
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| CN106849635B (en) * | 2017-04-01 | 2019-07-30 | 中国科学院电工研究所 | Cascade connection multi-level inverter submodule pressure bypass circuit out of control |
| CN107147305B (en) * | 2017-04-10 | 2019-06-28 | 中国科学院电工研究所 | Multilevel converter submodule by-pass switch automatic triggering circuit |
| CN108111007B (en) * | 2018-01-31 | 2020-09-08 | 南京南瑞继保电气有限公司 | Power module redundancy energy-taking circuit and control method |
| CN109274256B (en) * | 2018-09-30 | 2020-11-17 | 南京南瑞继保电气有限公司 | Power module redundant energy supply circuit based on breakdown diode and control method |
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