Trigger monitoring device for thyristor stage circuit in direct current energy bleeding device and energy taking method

Abstract

The application provides a trigger monitoring device and energy taking method for a thyristor stage circuit in a direct current energy release device, and the trigger monitoring device comprises a fast energy taking circuit 1, a large-capacity energy taking circuit 2, an overvoltage protection circuit 7 and a post-stage function circuit 8; the fast energy taking circuit 1 is used for taking energy during the charging process of the thyristor stage circuit, supplying energy to the overvoltage protection circuit 7, taking energy from an alternating current harmonic when the charging of the thyristor stage circuit is completed and the alternating current harmonic exists between the two ends of the thyristor 9, and supplying energy to the large-capacity energy taking circuit 2 through a one-way current circuit 13; the large-capacity energy taking circuit 2 is used for taking energy from the two ends of the thyristor 9 in a direct current voltage energy taking mode and supplying energy to the post-stage function circuit 8; the fast energy taking and the large-capacity energy taking are combined, the fast energy taking makes the overvoltage protection circuit 7 enter the working state as soon as possible, and the large-capacity energy taking ensures the normal working of the trigger monitoring device.

Description

Technical Field

[0001] This invention belongs to the field of ultra-high voltage direct current transmission technology, specifically relating to a triggering monitoring device and energy harvesting method for thyristor-level circuits in a DC energy discharge device. Background Technology

[0002] DC power dissipation devices are used in DC transmission systems and are configured on the DC bus. Their operation is controllable. When the DC bus voltage is too high, they receive an activation command to dissipate excess power from the DC bus and maintain the DC bus voltage. The DC power dissipation device includes a series-connected thyristor stage circuit, consisting of thyristors, damping capacitors, damping resistors, voltage-equalizing resistors, and a trigger monitoring unit. The trigger monitoring unit performs the functions of triggering and monitoring the thyristors. In applications such as UHVDC converter valves, the thyristor stage circuit is subjected to AC voltage; therefore, the trigger monitoring unit can extract energy from the thyristors through the damping branch.

[0003] In a DC energy dissipation device, the thyristor stage circuit is subjected to DC voltage and a small AC ripple voltage. Under certain operating conditions, this AC ripple voltage may drop to zero, making it impossible to obtain sufficient energy through the damping branch. Furthermore, the overvoltage protection circuit in the trigger monitoring unit requires rapid energy acquisition to quickly establish overvoltage protection and prevent thyristor breakdown during system charging. Simultaneously, the system requires a sufficiently large energy harvesting circuit to ensure the trigger monitoring unit can continue operating for as long as possible after the energy source is lost. Existing technologies focus on either rapid or high-capacity energy harvesting, failing to simultaneously meet both requirements and thus hindering the safe and stable operation of the trigger monitoring unit. Therefore, energy harvesting for the trigger monitoring unit is a major technical challenge. There is currently an urgent need for a hybrid energy harvesting system for the thyristor trigger monitoring unit in a DC energy dissipation device. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention proposes a trigger monitoring device for the thyristor-level circuit in a DC energy dissipation device. The thyristor-level circuit comprises a thyristor 9, a voltage equalization resistor 12, a damping capacitor 11, a damping resistor 10, and a trigger monitoring device. The trigger monitoring device includes:

[0005] Fast power harvesting circuit 1, high-capacity power harvesting circuit 2, overvoltage protection circuit 7, and subsequent functional circuit 8;

[0006] The fast power harvesting circuit 1 is connected to the high-capacity power harvesting circuit 2 and the overvoltage protection circuit 7, respectively.

[0007] The fast energy harvesting circuit 1 is connected to the anode of the thyristor 9 through a damping capacitor 11 and a damping resistor 10, and the fast energy harvesting circuit 1 is connected to the cathode of the thyristor 9.

[0008] The high-capacity power harvesting circuit 2 is connected to the subsequent functional circuit 8;

[0009] The high-capacity power extraction circuit 2 is connected to the anode of the thyristor 9 through the voltage equalization resistor 12, and the high-capacity power extraction circuit 2 is connected to the cathode of the thyristor 9.

[0010] The fast power extraction circuit 1 is used to extract energy during the charging process of the thyristor stage circuit and supply energy to the overvoltage protection circuit 7. It is also used to extract energy from the AC harmonics after the thyristor stage circuit is fully charged and there are AC harmonics at both ends of the thyristor 9, and supply energy to the high-capacity power extraction circuit 2 through the unidirectional current circuit 13.

[0011] The high-capacity power extraction circuit 2 is used to extract power from the two ends of the thyristor 9 using DC voltage and supply power to the subsequent functional circuit 8.

[0012] Preferably, the trigger monitoring device further includes: an auxiliary circuit and a laser energy harvesting circuit 3;

[0013] The auxiliary circuit is connected to the high-capacity energy harvesting circuit 2 and the laser energy harvesting circuit 3, respectively.

[0014] The laser energy harvesting circuit 3 is connected to the high-capacity energy harvesting circuit 2;

[0015] The auxiliary circuit is used to monitor the energy state of the high-capacity energy harvesting circuit 2 and to emit laser light to the laser energy harvesting circuit 3 according to the energy state of the high-capacity energy harvesting circuit 2.

[0016] The laser energy harvesting circuit 3 is used to convert laser light into electrical energy, and to supply the converted electrical energy to the high-capacity energy harvesting circuit 2 through the unidirectional flow circuit 14.

[0017] Preferably, the auxiliary circuit includes: a power monitoring circuit 4, a control device 5, and a laser power supply device 6;

[0018] The power monitoring circuit 4, the control device 5, and the laser power supply device 6 are connected in sequence.

[0019] The power monitoring circuit 4 is connected to the high-capacity power harvesting circuit 2;

[0020] The laser power supply device 6 is connected to the laser energy harvesting circuit 3 via optical fiber 15;

[0021] The power monitoring circuit 4 is used to monitor the energy of the high-capacity energy harvesting circuit 2, determine whether the energy harvested by the high-capacity energy harvesting circuit 2 is greater than a set value, and send the determination result to the control device 5.

[0022] The control device 5 is used to start the laser power supply device 6 when the judgment result is negative, and is also used to turn off the laser power supply device 6 when the judgment result is positive.

[0023] The laser power supply device 6 is used to transmit laser light to the laser energy harvesting circuit 3 via optical fiber 15.

[0024] Preferably, the power monitoring circuit 4 and the control device 5 are connected sequentially via optical fiber or electrical wires.

[0025] Preferably, the judgment result is characterized by pulse, level, or communication coding.

[0026] Preferably, the high-capacity power extraction circuit 2 includes: a power extraction branch, a high-capacity power supply, and an overvoltage bypass protection circuit;

[0027] The energy extraction branch is used to extract energy from the voltage across the thyristor 9 when the voltage across the thyristor 9 is not 0, to power the subsequent functional circuit 8 and to charge the high-capacity power supply.

[0028] The high-capacity power supply is used to store the acquired energy and releases the stored energy when the voltage across the thyristor 9 is 0, continuously supplying power to the subsequent functional circuit 8.

[0029] The overvoltage bypass protection circuit is used to bypass the energy extraction branch when the energy stored in the high-capacity power supply reaches a set value.

[0030] Based on the same inventive concept, the present invention also provides a method for harvesting energy from a trigger monitoring device in a DC energy dissipation device, wherein the energy harvesting method uses the aforementioned trigger monitoring device to harvest energy, including:

[0031] When the thyristor stage circuit is in the charging process, the fast energy harvesting circuit 1 obtains energy from the two ends of the thyristor 9 through the damping capacitor 11 and the damping resistor 10 to power the overvoltage protection circuit 7.

[0032] The high-capacity power extraction circuit 2 extracts energy from the two ends of the thyristor 9 via the voltage equalization resistor 12 to power the subsequent functional circuit 8.

[0033] When the thyristor stage circuit is fully charged and there are AC harmonics at both ends of thyristor 9, energy is extracted from the AC harmonics at both ends of thyristor 9 through the fast energy extraction circuit 1 to power the high-capacity energy extraction circuit 2.

[0034] Compared with the closest existing technology, the present invention has the following beneficial effects:

[0035] This invention provides a trigger monitoring device and energy harvesting method for a thyristor-stage circuit in a DC energy dissipation device. The thyristor-stage circuit consists of a thyristor 9, a voltage equalization resistor 12, a damping capacitor 11, a damping resistor 10, and a trigger monitoring device. The trigger monitoring device comprises: a fast energy harvesting circuit 1, a high-capacity energy harvesting circuit 2, an overvoltage protection circuit 7, and a subsequent functional circuit 8. The fast energy harvesting circuit 1 is connected to the high-capacity energy harvesting circuit 2 and the overvoltage protection circuit 7, respectively. The fast energy harvesting circuit 1 is connected to the anode of the thyristor 9 through the damping capacitor 11 and the damping resistor 10, and is also connected to the cathode of the thyristor 9. The high-capacity power extraction circuit 2 is connected to the subsequent functional circuit 8. The high-capacity power extraction circuit 2 is connected to the anode of the thyristor 9 via an equalizing resistor 12, and also to the cathode of the thyristor 9. The fast power extraction circuit 1 is used to extract energy during the charging process of the thyristor stage circuit to supply power to the overvoltage protection circuit 7. It is also used to extract energy from the AC harmonics after the thyristor stage circuit has finished charging and when there are AC harmonics at the two ends of the thyristor 9, and supply power to the high-capacity power extraction circuit 2 through a unidirectional current circuit 13. The high-capacity power extraction circuit 2 is used to extract energy from the two ends of the thyristor 9 using DC voltage and supply power to the subsequent functional circuit 8. This invention combines fast power extraction with high-capacity power extraction, enabling both rapid power extraction to quickly put the overvoltage protection circuit 7 into working condition and high-capacity power extraction to ensure the normal operation of the trigger monitoring device.

[0036] This invention enables the large-capacity power supply to release stored energy to maintain the operation of the trigger monitoring device for a period of time after there is no voltage across the thyristor 9. Under extreme conditions, the laser power supply circuit 3 can still ensure the normal operation of the trigger monitoring device, thus improving the reliability of the trigger monitoring device. Attached Figure Description

[0037] Figure 1 A schematic diagram of the trigger monitoring device for the thyristor stage circuit in the DC energy dissipation device provided by the present invention;

[0038] Figure 2 This is a block diagram of a thyristor-level circuit.

[0039] Figure 3 A flowchart illustrating the energy harvesting method of the trigger monitoring device for the thyristor stage circuit in the DC energy dissipation device provided by this invention.

[0040] Explanation of reference numerals: 1-Fast power harvesting circuit, 2-Large capacity power harvesting circuit, 3-Laser power harvesting circuit, 4-Power supply monitoring circuit, 5-Control equipment, 6-Laser power supply device, 7-Overvoltage protection circuit, 8-Subsequent functional circuit, 9-Thyristor, 10-Damping resistor, 11-Damping capacitor, 12-Voltage equalizing resistor, 13-Unidirectional current circuit, 14-Unidirectional current circuit, 15-Fiber optic cable, 16-Trigger monitoring unit. Detailed Implementation

[0041] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0042] Example 1:

[0043] A schematic diagram of the trigger monitoring device for the thyristor stage circuit in the DC energy dissipation device provided by this invention is shown below. Figure 1 As shown, the thyristor stage circuit consists of a thyristor 9, a voltage equalization resistor 12, a damping capacitor 11, a damping resistor 10, and a trigger monitoring device.

[0044] The trigger monitoring device includes:

[0045] Fast power harvesting circuit 1, high-capacity power harvesting circuit 2, overvoltage protection circuit 7, and subsequent functional circuit 8;

[0046] The fast power harvesting circuit 1 is connected to the high-capacity power harvesting circuit 2 and the overvoltage protection circuit 7, respectively.

[0047] The fast energy harvesting circuit 1 is connected to the anode of the thyristor 9 through a damping capacitor 11 and a damping resistor 10, and the fast energy harvesting circuit 1 is connected to the cathode of the thyristor 9.

[0048] The high-capacity power harvesting circuit 2 is connected to the subsequent functional circuit 8;

[0049] The high-capacity power extraction circuit 2 is connected to the anode of the thyristor 9 through the voltage equalization resistor 12, and the high-capacity power extraction circuit 2 is connected to the cathode of the thyristor 9.

[0050] The fast power extraction circuit 1 is used to extract energy during the charging process of the thyristor stage circuit and supply energy to the overvoltage protection circuit 7. It is also used to extract energy from the AC harmonics after the thyristor stage circuit is fully charged and there are AC harmonics at both ends of the thyristor 9, and supply energy to the high-capacity power extraction circuit 2 through the unidirectional current circuit 13.

[0051] The high-capacity power extraction circuit 2 is used to extract power from the two ends of the thyristor 9 using DC voltage and supply power to the subsequent functional circuit 8.

[0052] The DC energy dissipation device includes a series-connected thyristor stage circuit, such as... Figure 2As shown, the system consists of a thyristor 9, a damping capacitor 11, a damping resistor 10, a voltage equalizing resistor 12, and a trigger monitoring unit 16. The trigger monitoring unit 16 performs the triggering and monitoring functions for the thyristor 9. In applications such as UHVDC converter valves, the thyristor stage circuit is subjected to AC voltage, so the trigger monitoring unit 16 can extract energy from the thyristor 9 through the damping branch. However, in DC energy dissipation devices, the thyristor stage circuit is subjected to DC voltage and a small AC ripple voltage, and under certain operating conditions, this AC ripple voltage may drop to 0, thus making it impossible to obtain sufficient energy through the damping branch. Furthermore, the overvoltage protection circuit in the trigger monitoring unit 16 is required to quickly obtain energy to provide overvoltage protection as soon as possible, preventing the thyristor 9 from being overvoltage-damped during the entire system charging process. Simultaneously, the system requires a sufficiently large energy extraction circuit to ensure that the trigger monitoring unit 16 can continue to operate for as long as possible after the energy source is lost.

[0053] This invention proposes a hybrid energy harvesting method that can simultaneously obtain energy from the DC equalization branch, the damping branch, and the external thyristor stage circuit, thus meeting the application requirements of DC energy discharge devices.

[0054] The complete hybrid energy harvesting method includes three sets of energy harvesting circuits.

[0055] (1) The fast energy harvesting circuit 1 is characterized by its fast energy harvesting but small capacity. During the charging process of the thyristor stage circuit, it can quickly harvest enough energy to enable the overvoltage protection circuit 7 to enter the working state as soon as possible, preventing the thyristor 9 from overvoltage breakdown during the charging process. After entering the normal working mode, if there are AC harmonics at both ends of the thyristor 9, the fast energy harvesting circuit 1 can continue to harvest energy. This part of the energy will be provided to the high-capacity energy harvesting circuit 2 through the unidirectional current circuit 13. The unidirectional current circuit 13 can prevent the energy of the high-capacity energy harvesting circuit 2 from being fed back to the fast energy harvesting circuit 1.

[0056] The high-capacity power extraction circuit 2 includes: a power extraction branch, a high-capacity power supply, and an overvoltage bypass protection circuit;

[0057] The energy extraction branch is used to extract energy from the voltage across the thyristor 9 when the voltage across the thyristor 9 is not 0, to power the subsequent functional circuit 8 and to charge the high-capacity power supply.

[0058] The high-capacity power supply is used to store the acquired energy and releases the stored energy when the voltage across the thyristor 9 is 0, continuously supplying power to the subsequent functional circuit 8.

[0059] The overvoltage bypass protection circuit is used to bypass the energy extraction branch when the energy stored in the high-capacity power supply reaches a set value.

[0060] (2) The high-capacity energy harvesting circuit 2 is the core component of the hybrid energy harvesting method and is the main energy source to ensure the normal operation of the entire trigger monitoring unit 16. It adopts a DC voltage energy harvesting method, characterized by slow energy harvesting and large capacity. After the voltage across the thyristor 9 is 0, the stored energy can allow the trigger monitoring unit 16 to continue working for a period of time. The high-capacity energy harvesting circuit 2 has an overvoltage bypass function. When sufficient energy is obtained, it can automatically bypass the high-capacity energy harvesting circuit to prevent the output voltage from being too high and affecting the normal operation of the subsequent circuits.

[0061] The trigger monitoring device also includes: auxiliary circuit and laser energy harvesting circuit 3;

[0062] The auxiliary circuit is connected to the high-capacity energy harvesting circuit 2 and the laser energy harvesting circuit 3, respectively.

[0063] The laser energy harvesting circuit 3 is connected to the high-capacity energy harvesting circuit 2;

[0064] The auxiliary circuit is used to monitor the energy state of the high-capacity energy harvesting circuit 2 and to emit laser light to the laser energy harvesting circuit 3 according to the energy state of the high-capacity energy harvesting circuit 2.

[0065] The laser energy harvesting circuit 3 is used to convert laser light into electrical energy, and to supply the converted electrical energy to the high-capacity energy harvesting circuit 2 through the unidirectional flow circuit 14.

[0066] The auxiliary circuit includes: a power monitoring circuit 4, a control device 5, and a laser power supply device 6;

[0067] The power monitoring circuit 4, the control device 5, and the laser power supply device 6 are connected in sequence.

[0068] The power monitoring circuit 4 is connected to the high-capacity power harvesting circuit 2;

[0069] The laser power supply device 6 is connected to the laser energy harvesting circuit 3 via optical fiber 15;

[0070] The power monitoring circuit 4 is used to monitor the energy of the high-capacity energy harvesting circuit 2, determine whether the energy harvested by the high-capacity energy harvesting circuit 2 is greater than a set value, and send the determination result to the control device 5.

[0071] The control device 5 is used to start the laser power supply device 6 when the judgment result is negative, and is also used to turn off the laser power supply device 6 when the judgment result is positive.

[0072] The laser power supply device 6 is used to transmit laser light to the laser energy harvesting circuit 3 via optical fiber 15.

[0073] (3) The laser energy harvesting circuit 3 converts laser energy into electrical energy and supplies it to the high-capacity energy harvesting circuit 2 through a one-way flow circuit 14. The one-way flow circuit 14 can prevent the energy from the high-capacity energy harvesting circuit 2 from being fed back to the laser energy harvesting circuit 3. The laser power supply device 6 located on the low-voltage side converts energy into electrical energy and sends it to the laser energy harvesting circuit 3 on the high-voltage side through an optical fiber 15. The laser energy harvesting circuit 3 can be located inside or outside the trigger monitoring unit 16, as an independent energy harvesting module, and is connected to the trigger monitoring unit 16 through electrical wires.

[0074] Under normal circumstances, the high-capacity power extraction circuit 2 can support the normal operation of the trigger monitoring unit 16. However, under certain extreme conditions, the voltage across the thyristor 9 may be too low, resulting in insufficient energy for the high-capacity power extraction circuit 2 to support the normal operation of the trigger monitoring unit 16. Furthermore, if the equalizing resistor 12 or the high-capacity power extraction circuit 2 fails, the trigger monitoring unit 16 will lack energy and fail to operate normally. Therefore, a laser power extraction circuit 3 is added to ensure that the trigger monitoring unit 16 can still operate normally under extreme conditions, thus improving reliability.

[0075] Laser power supply devices 6 generally have a short lifespan and low reliability under long-term continuous operation, which obviously does not meet the high reliability requirements of ultra-high voltage direct current transmission projects. In the hybrid energy harvesting method of this invention, a power monitoring circuit 4 is designed to monitor the status of the high-capacity power supply in real time, determine whether the energy is sufficient, and send the result to the control device 5 on the low-voltage side. The connection between the power monitoring circuit 4 and the control device 5 can be an optical fiber or an electrical wire. The methods for characterizing whether the energy is sufficient include: the presence or absence of pulses, the high or low level of the pulse, and communication encoding. Under normal operating conditions, the voltage across the thyristor 9 is high, and the high-capacity power harvesting circuit 2 can obtain sufficient energy. The power monitoring circuit 4 determines that the energy harvesting is sufficient and sends the result to the control device 5 on the low-voltage side. The control device implements the start / stop logic of the laser power supply device 6, controlling the laser power supply device 6 to stop working. Under extreme operating conditions or when the high-capacity power harvesting circuit 2 fails, the power monitoring circuit 4 determines that the energy harvesting is insufficient, and the control device 5 controls the laser power supply device 6 to start working, supplying power to the trigger monitoring unit 16.

[0076] This invention proposes a hybrid energy harvesting design method for the thyristor trigger monitoring unit of a DC energy discharge device. By adopting a hybrid energy harvesting method of fast energy harvesting, large capacity energy harvesting, and laser energy harvesting, the following stringent requirements of the trigger monitoring unit 16 are met: (1) large energy harvesting capacity to ensure normal operation of the trigger monitoring unit 16, and the trigger monitoring unit 16 can continue to work for a period of time after there is no voltage across the thyristor 9; (2) fast energy harvesting speed to enable the overvoltage protection circuit 7 to enter the working state as soon as possible; (3) high reliability.

[0077] Example 2:

[0078] Based on the same inventive concept, this invention also provides a method for harvesting energy from a trigger monitoring device in a thyristor-stage circuit of a DC energy dissipation device, such as... Figure 3 As shown;

[0079] The energy harvesting method uses the trigger monitoring device in Embodiment 1 to harvest energy, including:

[0080] Step 1: When the thyristor stage circuit is in the charging process, the fast energy harvesting circuit 1 obtains energy from the two ends of the thyristor 9 through the damping capacitor 11 and the damping resistor 10 to power the overvoltage protection circuit 7.

[0081] Step 2: Energy is obtained from the two ends of the thyristor 9 through the high-capacity power extraction circuit 2 via the voltage equalization resistor 12 to power the subsequent functional circuit 8;

[0082] Step 3: When the thyristor stage circuit is fully charged and there are AC harmonics at both ends of thyristor 9, energy is extracted from the AC harmonics at both ends of thyristor 9 through the fast energy extraction circuit 1 to power the high-capacity energy extraction circuit 2.

[0083] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0084] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0085] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0086] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present invention, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the invention, but these changes, modifications or equivalent substitutions are all within the scope of protection of the pending claims of the invention.

Claims

1. A trigger monitoring device for a thyristor-stage circuit in a DC energy dissipation device, wherein the thyristor-stage circuit comprises a thyristor (9), a voltage equalizing resistor (12), a damping capacitor (11), a damping resistor (10), and a trigger monitoring device, characterized in that, The trigger monitoring device includes: Fast power extraction circuit (1), high-capacity power extraction circuit (2), overvoltage protection circuit (7) and subsequent functional circuit (8); The fast power harvesting circuit (1) is connected to the high-capacity power harvesting circuit (2) and the overvoltage protection circuit (7) respectively; The fast energy harvesting circuit (1) is connected to the anode of the thyristor (9) through a damping capacitor (11) and a damping resistor (10), and the fast energy harvesting circuit (1) is connected to the cathode of the thyristor (9). The high-capacity power harvesting circuit (2) is connected to the subsequent functional circuit (8); The high-capacity energy harvesting circuit (2) is connected to the anode of the thyristor (9) through the equalizing resistor (12), and the high-capacity energy harvesting circuit (2) is connected to the cathode of the thyristor (9); The fast energy extraction circuit (1) is used to extract energy during the charging process of the thyristor stage circuit and supply energy to the overvoltage protection circuit (7). It is also used to extract energy from the AC harmonics after the thyristor stage circuit is fully charged and there are AC harmonics at both ends of the thyristor (9), and supply energy to the large capacity energy extraction circuit (2) through the unidirectional flow circuit (13). The high-capacity power extraction circuit (2) is used to extract power from the two ends of the thyristor (9) using DC voltage and supply power to the subsequent functional circuit (8).

2. The apparatus as claimed in claim 1, characterized in that, The trigger monitoring device further includes: an auxiliary circuit and a laser energy harvesting circuit (3); The auxiliary circuit is connected to the high-capacity energy harvesting circuit (2) and the laser energy harvesting circuit (3) respectively; The laser energy harvesting circuit (3) is connected to the high-capacity energy harvesting circuit (2); The auxiliary circuit is used to monitor the energy state of the high-capacity energy harvesting circuit (2) and to emit laser light to the laser energy harvesting circuit (3) according to the energy state of the high-capacity energy harvesting circuit (2). The laser energy harvesting circuit (3) is used to convert laser into electrical energy and use the converted electrical energy to supply power to the high-capacity energy harvesting circuit (2) through a one-way flow circuit (14).

3. The apparatus as described in claim 2, characterized in that, The auxiliary circuit includes: a power monitoring circuit (4), a control device (5), and a laser power supply device (6); The power monitoring circuit (4), control device (5), and laser power supply device (6) are connected in sequence; The power monitoring circuit (4) is connected to the high-capacity power harvesting circuit (2); The laser power supply device (6) is connected to the laser energy harvesting circuit (3) via an optical fiber (15); The power monitoring circuit (4) is used to monitor the energy of the large-capacity energy harvesting circuit (2), determine whether the energy harvested by the large-capacity energy harvesting circuit (2) is greater than the set value, and send the determination result to the control device (5). The control device (5) is used to start the laser power supply device (6) when the judgment result is negative, and to turn off the laser power supply device (6) when the judgment result is positive. The laser power supply device (6) is used to transmit laser light to the laser energy harvesting circuit (3) via optical fiber (15).

4. The apparatus as described in claim 3, characterized in that, The power monitoring circuit (4) and the control device (5) are connected in sequence via optical fiber or electrical wires.

5. The apparatus as described in claim 3, characterized in that, The judgment result can be represented by pulse, level, or communication code.

6. The apparatus as claimed in claim 1, characterized in that, The high-capacity power extraction circuit (2) includes: a power extraction branch, a high-capacity power extraction power supply, and an overvoltage bypass protection circuit; The energy extraction branch is used to extract energy from the voltage across the thyristor (9) when the voltage across the thyristor (9) is not 0, to power the subsequent functional circuit (8) and to charge the large-capacity energy extraction power supply. The high-capacity power supply is used to store the acquired energy and releases the stored energy when the voltage across the thyristor (9) is 0, continuously supplying power to the subsequent functional circuit (8); The overvoltage bypass protection circuit is used to bypass the energy extraction branch when the energy stored in the high-capacity power supply reaches a set value.

7. A method for harvesting energy from a trigger monitoring device for a thyristor-stage circuit in a DC energy dissipation device, characterized in that, The energy harvesting method employs the trigger monitoring device as described in any one of claims 1-6 to harvest energy, including: When the thyristor stage circuit is in the charging process, energy is obtained from the two ends of the thyristor (9) through the fast energy extraction circuit (1) via the damping capacitor (11) and the damping resistor (10) to power the overvoltage protection circuit (7). Energy is obtained from the two ends of the thyristor (9) through the high-capacity energy extraction circuit (2) via the voltage equalization resistor (12) to power the subsequent functional circuit (8); When the thyristor stage circuit is fully charged and there are AC harmonics at both ends of the thyristor (9), the fast energy harvesting circuit (1) extracts energy from the AC harmonics at both ends of the thyristor (9) to power the high-capacity energy harvesting circuit (2).

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