Damping capacitor durability test device for a converter valve

Abstract

The disclosure provides a damping capacitor durability test device of a converter valve, and relates to the technical field of power electronics. The damping capacitor durability test device of the converter valve comprises a voltage regulating module, a current regulating module, a monitoring and analyzing module and an environmental test box. The current regulating module is connected in series with at least two thyristors, and the obtained series branch is connected to the output end of the voltage regulating module. The input end of the voltage regulating module is connected to an alternating current source, so that the alternating current source can supply power to each corresponding thyristor and the damping capacitor connected in parallel therewith through the voltage regulating module and the current regulating module. The state parameters of each corresponding damping capacitor are monitored, analyzed and recorded by the monitoring and analyzing module. The durability test of multiple groups of damping capacitors can be realized by one test, and the test efficiency is improved. Moreover, the damping capacitors are arranged in the environmental test box through corresponding insulation supports, so that the test device can be simplified, the cost is reduced, and the economy is improved.

Description

Technical Field

[0001] This disclosure relates to the field of power electronics technology, and in particular to a device for testing the durability of the damping capacitor of a converter valve. Background Technology

[0002] Thyristors are the core components of converter valves. Multiple thyristors are usually connected in series to meet the voltage requirements of the converter valve. In addition, each thyristor is usually connected in parallel with a corresponding damping capacitor to absorb overvoltage during the turn-off process of the converter valve and to achieve voltage equalization among the series thyristors.

[0003] To verify the reliability of damping capacitors, durability tests are required. Typically, the damping capacitors are run continuously for 500 hours or 1000 hours under actual operating conditions at high temperatures to verify their long-term reliability and provide data and experimental support for engineering applications.

[0004] Traditional testing equipment can only perform durability tests on the damping capacitor connected in parallel with a single thyristor, and its structure is complex and requires numerous devices. Therefore, when performing durability tests on the damping capacitor of the entire converter valve, there are problems of low efficiency and high cost. Summary of the Invention

[0005] In view of the above problems, this disclosure provides a device for testing the durability of the damping capacitance of a converter valve, so as to improve the efficiency and economy of the durability test of the damping capacitance of the converter valve. The specific solution is as follows:

[0006] The first aspect of this disclosure provides a damping capacitance durability testing device for a converter valve, comprising: a voltage regulating module, a flow regulating module, a monitoring and analysis module, and an environmental test chamber; wherein...

[0007] The converter valve includes at least two thyristors connected in series, and each thyristor is connected in parallel with a corresponding damping capacitor.

[0008] The current regulating module is connected in series with at least two of the thyristors, and the resulting series branch is connected to the output terminal of the voltage regulating module. The input terminal of the voltage regulating module is connected to an AC source.

[0009] The damping capacitors connected in parallel to each of the thyristors in the series branch are respectively installed in the environmental test chamber through corresponding insulating supports;

[0010] The voltage regulating module is used to adjust the test voltage of the damping capacitor in the environmental test chamber;

[0011] The current regulation module is used to adjust the test current of the damping capacitor in the environmental test chamber;

[0012] The monitoring and analysis module is used to monitor, analyze, and record the state parameters of the damping capacitor in the environmental test chamber.

[0013] In one possible implementation, the damping capacitor durability testing apparatus further includes: a thyristor test bench;

[0014] Each of the thyristors in the series branch is set on the thyristor test bench, and each of the two ends of the thyristor is connected to a corresponding damping resistor.

[0015] Each of the damping capacitors in the environmental test chamber is connected to the damping resistor of the corresponding thyristor via a corresponding insulated cable.

[0016] In one possible implementation, the voltage regulating module includes: a voltage regulator;

[0017] The two ends of the voltage regulator serve as the input and output terminals of the voltage regulating module, respectively.

[0018] In one possible implementation, the voltage regulating module further includes: a transformer;

[0019] The voltage regulator and the transformer are connected in series between the input and output terminals of the voltage regulating module.

[0020] In one possible implementation, the current regulating module includes a reactor and a first resistor connected in series.

[0021] In one possible implementation, the monitoring and analysis module includes: an analysis unit, at least two first current acquisition units, and multiple first voltage acquisition units;

[0022] The first current acquisition unit is used to acquire the current corresponding to the damping capacitor;

[0023] The first voltage acquisition unit is used to acquire the voltage corresponding to the damping capacitor;

[0024] The analysis unit is used to analyze and record the data output by each of the first current acquisition units and each of the first voltage acquisition units.

[0025] In one possible implementation, the monitoring and analysis module further includes: a second current acquisition unit and a second voltage acquisition unit;

[0026] The second current acquisition unit is used to acquire the current of the series branch;

[0027] The second voltage acquisition unit is used to acquire the series voltage of each thyristor in the series branch.

[0028] In one possible implementation, the damping capacitor durability test apparatus further includes: a commutation simulation branch;

[0029] The commutation simulation branch is connected in parallel with at least each of the thyristors connected in series in the series branch;

[0030] The commutation simulation branch is used to simulate the voltage changes caused by commutation of other bridge arms in the converter where the commutation valve is located.

[0031] In one possible implementation, the commutation simulation branch includes a switch, a second resistor, and a diode connected in series.

[0032] In one possible implementation, the damping capacitor durability test apparatus further includes: a switch;

[0033] The switch is connected between the AC power source and the voltage regulating module.

[0034] The damping capacitor durability testing device for the converter valve disclosed herein includes: a voltage regulating module, a current regulating module, a monitoring and analysis module, and an environmental test chamber. The current regulating module is connected in series with at least two thyristors, and the resulting series branch is connected to the output terminal of the voltage regulating module. The input terminal of the voltage regulating module is connected to an AC power source, allowing the AC power source to supply power to each thyristor and its parallel damping capacitor through the voltage regulating module and the current regulating module. The monitoring and analysis module monitors, analyzes, and records the state parameters of each damping capacitor, thus enabling durability testing of multiple groups of damping capacitors in a single test, improving testing efficiency. Furthermore, this device only requires each damping capacitor to be placed in the environmental test chamber using its respective insulating support; other components do not need to be placed in the environmental test chamber. Therefore, it simplifies the testing equipment, reduces costs, and improves economic efficiency. Attached Figure Description

[0035] The features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and elements and actual parts are not necessarily drawn to scale.

[0036] Figure 1 A schematic diagram of the single-stage electrical structure in a converter valve provided for a traditional solution;

[0037] Figure 2 A schematic diagram of a structure for a damping capacitance durability testing device for a converter valve provided in an embodiment of this disclosure;

[0038] Figure 3 A circuit diagram of a damping capacitance durability testing device for a converter valve provided in an embodiment of this disclosure;

[0039] Figure 4 Another circuit diagram of the damping capacitance durability test apparatus for the converter valve provided in the embodiments of this disclosure. Detailed Implementation

[0040] The embodiments of this disclosure are described below with reference to the accompanying drawings. The terminology used in the Description of Embodiments section of this disclosure is for illustrative purposes only and is not intended to limit the scope of this disclosure.

[0041] The embodiments of this disclosure are described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure. Those skilled in the art will understand that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of this disclosure are also applicable to similar technical problems.

[0042] The terms “first,” “second,” etc., used in this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the description of embodiments of this disclosure. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of units is not necessarily limited to those units, but may include other units not expressly listed or inherent to those processes, methods, products, or apparatuses.

[0043] A converter valve typically includes multiple single-stage electrical structures connected in series. Each single-stage electrical structure includes a thyristor, a TCU (Thyristor Control Unit), and a valve damping circuit.

[0044] The TCU (Transmission Control Unit) is a high-potential electronic board installed on the corresponding thyristor. It is responsible for receiving optical trigger pulses from the VBE (Valve Base Electronics) and converting them into electrical pulses to drive the thyristor gate. Simultaneously, it samples the thyristor terminal voltage and reports the thyristor trigger status back to the VBE via optical fiber, achieving single-stage status monitoring, fault self-checking, and emergency trigger protection. The VBE receives control commands from the upper level and converts them into optical pulses to be sent to the single-stage electrical structure. It also receives high-potential reports and self-check information from the single-stage electrical structure, completing triggering, monitoring, protection, and fault interlocking.

[0045] like Figure 1As shown, the valve damping circuit mainly includes a damping resistor and a damping capacitor. The damping resistor includes... Figure 1 The resistors R11 to R16 and the damping capacitors include Figure 1 Capacitors C1 and C2 are connected in parallel. The main function of the valve damping circuit is to suppress overvoltage, dynamically equalize voltage, and provide an energy extraction path for the TCU. During the turn-off process of the converter valve, voltage spikes and overvoltages will occur. The damping capacitors are connected in parallel with the thyristor V. T At both ends, utilizing the characteristic of a capacitor that its voltage does not change abruptly, these overvoltages are absorbed and buffered to protect the thyristor V. T To protect them from overvoltage damage, preventing them from breaking down or being damaged due to overvoltage. At the same time, the damping capacitor also serves to equalize the voltage across the series-connected thyristors. T The voltage across the thyristor can be distributed more evenly, ensuring that each thyristor V T The voltage it withstands is within its withstand voltage range, which improves the stability and reliability of the converter valve's operation. Figure 1 Capacitor C3 is used for AC power extraction by the TCU, and capacitors C2 and C3 are usually packaged together in a single housing. The operating parameters of the damping capacitor are determined by the thyristor valve trigger voltage and the damping circuit parameters, which are not specified here.

[0046] This disclosure provides a device for testing the durability of the damping capacitor of a converter valve, thereby improving the efficiency and economy of the durability test. The specific solution is as follows:

[0047] like Figure 2 As shown, the damping capacitance durability test device for the converter valve includes: a voltage regulating module 101, a flow regulating module 102, a monitoring and analysis module, and an environmental test chamber 201; wherein:

[0048] The converter valve includes at least two thyristors connected in series (such as...) Figure 1 The thyristor V shown T1 To V Tn Each thyristor is connected in parallel with a corresponding damping capacitor, such as the first thyristor V. T1 The second thyristor V is connected in parallel with corresponding damping capacitors C1-1 and C1-2. T2 The nth thyristor V is connected in parallel with corresponding damping capacitors C2-1 and C2-2, ... Tn The corresponding damping capacitors Cn-1 and Cn-2 are connected in parallel.

[0049] The current regulation module 102 and at least two thyristors ( Figure 1 All the thyristors V in the converter valve T1 To V Tn(For example, the series connection is used to demonstrate the process.) The resulting series branch is connected to the output terminal of the voltage regulating module 101, and the input terminal of the voltage regulating module 101 is connected to the AC source. In practical applications, the damping capacitor durability test device may also include a switch K1, which is connected between the AC source AC and the voltage regulating module 101.

[0050] The damping capacitors connected in parallel to each thyristor in the series branch are respectively set in the environmental test chamber 201 through corresponding insulating supports. The environmental test chamber 201 is used to realize the temperature of each damping capacitor at least under actual operating conditions, such as the temperature of each damping capacitor under more stringent test requirements. This is not limited here and depends on the specific application environment.

[0051] The voltage regulating module 101 is used to adjust the test voltage of the damping capacitor in the environmental test chamber 201; the specific value of the test voltage can be determined according to the actual situation and is not limited here.

[0052] The current regulating module 102 is used to adjust the test current of the damping capacitor in the environmental test chamber 201; the specific value of the test current can be determined according to the actual situation and is not limited here.

[0053] The monitoring and analysis module (not shown in the figure) is used to monitor, analyze, and record the state parameters of the damping capacitor in the environmental test chamber 201. These state parameters may include voltage, current, etc.

[0054] In practical applications, the AC source can provide AC power to the voltage regulating module 101 via switch K1. The power output from the voltage regulating module 101 is then transmitted to the thyristors via the current regulating module 102, which can be connected in series with all the thyristors in the converter valve. Through the voltage regulation function of the voltage regulating module 101 and the current regulation function of the current regulating module 102, the working state of the converter valve can be simulated, making the discharge current of the damping capacitors more closely resemble the actual engineering operating state. Furthermore, by arranging the damping capacitors at each stage of the valve within the environmental test chamber 201 and connecting them to the corresponding thyristors via high-voltage insulated cables, these damping capacitors can be placed in a controlled high-temperature testing environment. Additionally, a monitoring and analysis module continuously monitors the voltage and current parameters of these damping capacitors, allowing the testing software to monitor, calculate, and evaluate the state of each damping capacitor.

[0055] The damping capacitor durability testing device for the converter valve provided in this embodiment, through the above-described structure, can perform durability tests on multiple groups of damping capacitors in a single test, improving testing efficiency and avoiding data anomalies and test failures caused by individual deviations of single test samples. Moreover, this device only requires each damping capacitor to be placed in the environmental test chamber 201 through its corresponding insulating bracket; other components do not need to be placed in the environmental test chamber 201. Therefore, it simplifies the testing device, reduces costs, improves economy, and also reduces the manufacturing difficulty of the testing device.

[0056] Furthermore, traditional methods for durability testing of damping capacitors are only suitable for short-term operation tests. This is particularly true for traditional methods used in high-power converter valve operation test systems. Due to the large number of devices and the complexity of these systems, unavoidable equipment failures can easily lead to interruptions in continuous operation up to 1000 hours. Additionally, the high testing costs make long-term damping capacitor testing uneconomical. In contrast, the testing apparatus provided in this embodiment simplifies the setup, improves reliability, and ensures long-term reliability. Moreover, the reduced number of devices lowers system construction and operating costs, resulting in superior technical and economic efficiency.

[0057] Furthermore, this embodiment can determine the state of the tested damping capacitor in real time by monitoring its status, recording the waveform during a fault and the fault-free operating time of the tested damping capacitor, thus enabling unattended automatic operation of the test system.

[0058] Based on the previous embodiment, such as Figure 1 As shown, the damping capacitor durability test device for the converter valve may further include: a thyristor test bench 202; in this case, each thyristor in the series branch is mounted on the thyristor test bench 202.

[0059] In addition, with Figure 1 As shown in the diagram, each thyristor has a corresponding damping resistor connected to its two ends; for example, the first thyristor V... T1 The two ends are respectively connected to corresponding damping resistors R1-1 and R1-2, and the second thyristor V T2 The two ends are respectively connected to corresponding damping resistors R2-1 and R2-2, ..., the nth thyristor V Tn The two ends are respectively connected to corresponding damping resistors Rn-1 and Rn-2. Among them, the damping resistors R1-1, R2-1, ..., Rn-1 can specifically include multiple resistors connected in parallel (as shown in the figure, resistors R11 to R13); the damping resistors R1-2, R2-2, ..., Rn-2 can specifically include multiple resistors connected in parallel (as shown in the figure, resistors R14 to R16).

[0060] Each damping capacitor in the environmental test chamber 201 is connected to the damping resistor of the corresponding thyristor through a corresponding insulated cable. That is, each damping capacitor is arranged in the environmental test chamber 201 through an insulated bracket, and then connected back to the damping resistor of each thyristor on the thyristor test bench 202 through a high-voltage insulated cable.

[0061] The thyristor test bench 202 is used to arrange multi-stage thyristors and their auxiliary components, providing them with corresponding physical support, insulation, and heat dissipation conditions. In practical applications, insulators can be used to physically support these components. Furthermore, considering the reliability and long-term operating parameters of the thyristors and valve damping circuits, air cooling or water cooling can be used for heat dissipation. In one example, given the relatively small operating current under actual operating conditions, forced air cooling can be used to dissipate heat from these components, improving economy and long-term reliability. The damping capacitors at each stage are arranged within the environmental test chamber 201 via insulating supports, and the damping capacitors at each stage are mutually insulated.

[0062] The damping capacitor is separated from the thyristor test bench 202 by multiple sets of high-voltage insulated cables and placed independently in the environmental test chamber 201 by an insulating bracket. That is, by using multiple sets of high-voltage insulated cables and insulating brackets, the damping capacitor under test is placed in a controlled test environment, instead of arranging the entire thyristor test bench 202 inside the environmental test chamber 201, which simplifies the test equipment and reduces the manufacturing difficulty of the test equipment.

[0063] Based on the above embodiments, this embodiment describes the specific structure of the damping capacitance durability testing device for the converter valve, for example, as follows: Figure 3 As shown, the voltage regulating module 101 may include: a voltage regulator TY; the two ends of the voltage regulator TY serve as the input and output terminals of the voltage regulating module 101, respectively.

[0064] In practical applications, the voltage regulating module 101 may also include Figure 3 As shown: Transformer T1; Voltage regulator TY and transformer T1 are connected in series between the input and output terminals of voltage regulating module 101.

[0065] like Figure 3 As shown, the AC source provides power for the operation of the test device. The voltage regulator TY adjusts the power supply voltage according to the test parameter requirements. The transformer T1 provides electromagnetic isolation between the back-end test circuit and the power supply.

[0066] Additionally, the current regulation module 102 may include Figure 3 The diagram shows a reactor L and a first resistor RZ connected in series. The reactor L and the first resistor RZ are used as a loop load to adjust the current value and waveform of the test loop.

[0067] In this embodiment, the trigger voltage of the thyristor is adjusted by regulating the voltage regulator TY, selecting the tap position of the transformer T, and setting the thyristor firing angle. This adjustment controls the test voltage of the damping capacitor under test, thereby determining the test current of the damping capacitor. In practical applications, the resistance value of the damping resistor and the test voltage value can be adjusted according to the requirements of the test parameters to coordinate with the adjustment of the test current value of the damping circuit.

[0068] In addition, the single-phase bridge arm operation of the converter valve can be simulated by the voltage regulator TY and the transformer T1, and the current can be adjusted by the load reactor L and the load resistor RZ, so that the thyristor valve can be turned on and off under small current and the operating state of the damping circuit can be kept consistent with that under large current.

[0069] Based on the above embodiments, the damping capacitance durability testing device for the converter valve may further include: Figure 3 As shown: commutation simulation branch 103; this commutation simulation branch 103 is connected in parallel with at least each of the thyristors connected in series in the above-mentioned series branch, such as... Figure 3 As shown, the branch after each thyristor and the first resistor RZ are connected in series can be connected in parallel with the commutation simulation branch 103; the commutation simulation branch 103 is used to simulate the voltage changes caused by the commutation of other bridge arms in the converter where the converter valve is located.

[0070] In practical applications, the commutation simulation branch 103 may include Figure 3 The diagram shows a series connection of a switch QT, a second resistor RF, and a diode D1. That is, the commutation analog branch 103 is composed of the second resistor RF, the diode D1, and the switch QT connected in series. The switch QT is a fast switch, and its specific implementation is not limited.

[0071] By controlling the switching transistor QT to turn on and off, the dynamic changes in the voltage of the thyristor under test during commutation of other arms in the converter can be simulated. For example, the converter can use a 6-pulse thyristor bridge, and the dynamic changes in the voltage of the thyristor under test during commutation of other arms of the 6-pulse thyristor bridge can be simulated through the commutation simulation branch 103.

[0072] The test apparatus provided in this embodiment consists of an AC source AC, a switch K1, a voltage regulator TY, a transformer T1, a reactor L, a first resistor RZ, a thyristor test bench 202, an environmental test chamber 201, and a commutation simulation branch 103. The entire test apparatus has a small number of devices, which can reduce the cost of the system and the test operation cost, and has excellent technical and economic efficiency.

[0073] Based on the above embodiments, the monitoring and analysis module in the damping capacitance durability testing device for the converter valve may include... Figure 4 (in) Figure 3(Based on the structure shown, for example, the following is illustrated): an analysis unit, at least two first current acquisition units, and multiple first voltage acquisition units; wherein, the first current acquisition units are used to acquire the current of the corresponding damping capacitor (e.g., ...). Figure 4 The currents IC1 to ICn shown in the figure), the first voltage acquisition unit is used to acquire the voltage of the corresponding damping capacitor (e.g., Figure 4 The voltages shown are Vtp1 to Vtp2n); the analysis unit is used to analyze and record the data output by each first current acquisition unit and each first voltage acquisition unit.

[0074] like Figure 4 As shown, each thyristor is connected in parallel to two damping capacitors connected in series; moreover, each thyristor in the series branch acquires the current of the corresponding two damping capacitors through a first current acquisition unit, and acquires the voltage of the corresponding two damping capacitors through two first voltage acquisition units.

[0075] In practical applications, this monitoring and analysis module may also include Figure 4 The diagram shows: a second current acquisition unit and a second voltage acquisition unit; wherein, the second current acquisition unit is used to acquire the current of the series branch (e.g., ...). Figure 4 The current Is shown in the figure), the second voltage acquisition unit is used to acquire the series voltage of each thyristor in the series branch (such as the current Is), Figure 4 The current Vt shown is shown.

[0076] This monitoring and analysis module can monitor the main circuit voltage Vt and main circuit current Is of the thyristor test bench 202, and measure the voltage across each stage of the damping capacitor, such as the voltage across the first thyristor Vt. T1 In the damping circuit, the voltage across damping capacitor C1-1 is Vtp1, the voltage across damping capacitor C1-2 is Vtp2, and the current is IC1; the monitoring data for other thyristors are not detailed here, but can be found in [reference needed]. Figure 4 The voltage and current data obtained from monitoring are input into the analysis unit, which calculates the capacitance value. By cyclically comparing the voltage, current, and capacitance values ​​of each damping capacitor, the unit analyzes and records the status of the corresponding damping capacitor. When the analysis unit detects an abnormality in a damping capacitor, it automatically records the waveform and data and sends an alarm message to the on-duty personnel via the backend. When the analysis unit detects continuous abnormalities in data over multiple cycles, it determines that the corresponding damping capacitor is faulty, automatically records the waveform and data, stops the test device, and sends a fault message to the on-duty personnel via the backend.

[0077] In addition, the VBE of the converter valve can trigger and control the thyristors at each stage through the TCU. The thyristors at each stage can also send status reports to the VBE through the TCU. When the VBE receives a thyristor-level fault report signal, it sends a waveform recording command to the analysis unit and a trip signal to the background control system.

[0078] The specific experimental process can be carried out according to the following steps:

[0079] (1) At the start of the test, first check the wiring and parameters of each damping circuit. After confirming that there are no errors, start the environmental test chamber 201 to the preset temperature.

[0080] (2) Start the power supply of the control system and the heat dissipation system of the thyristor test bench 202.

[0081] (3) Close switch K1, adjust the output voltage of voltage regulator TY to the target value, and switch voltage regulator TY to manual voltage regulation mode to keep the coil position of voltage regulator TY unchanged.

[0082] (4) The control system issues a trigger command to trigger the thyristor according to the preset trigger angle.

[0083] (5) Check whether the monitored voltage and current signal values ​​are correct. If there is an abnormal shutdown or power failure, check and return to step (1).

[0084] (6) The system runs automatically and records data according to the set running time. When a fault occurs, the system will automatically stop and alarm.

[0085] The test apparatus provided in this embodiment can monitor the state of the tested damping capacitor in real time through the monitoring and analysis module, determine its state in real time, record the waveform when a fault occurs and the fault-free running time of the tested damping capacitor, and realize the unattended automatic operation of the test system.

[0086] Similar or identical parts between the various embodiments in this disclosure can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the description of the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment solution according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0087] Those skilled in the art will also recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0088] The above description of the disclosed embodiments shows that the features described in the various embodiments of this disclosure can be substituted for or combined with each other, enabling those skilled in the art to implement or use this disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for testing the durability of the damping capacitance of a converter valve, characterized in that, include: The system includes a voltage regulation module, a current regulation module, a monitoring and analysis module, and an environmental test chamber; among which, The converter valve includes at least two thyristors connected in series, and each thyristor is connected in parallel with a corresponding damping capacitor. The current regulating module is connected in series with at least two of the thyristors, and the resulting series branch is connected to the output terminal of the voltage regulating module. The input terminal of the voltage regulating module is connected to an AC source. The damping capacitors connected in parallel to each of the thyristors in the series branch are respectively installed in the environmental test chamber through corresponding insulating supports; The voltage regulating module is used to adjust the test voltage of the damping capacitor in the environmental test chamber; The current regulation module is used to adjust the test current of the damping capacitor in the environmental test chamber; The monitoring and analysis module is used to monitor, analyze, and record the state parameters of the damping capacitor in the environmental test chamber.

2. The damping capacitance durability test device for the converter valve according to claim 1, characterized in that, The damping capacitor durability testing device also includes: a thyristor test bench; Each of the thyristors in the series branch is set on the thyristor test bench, and each of the two ends of the thyristor is connected to a corresponding damping resistor. Each of the damping capacitors in the environmental test chamber is connected to the damping resistor of the corresponding thyristor via a corresponding insulated cable.

3. The damping capacitance durability test device for the converter valve according to claim 1, characterized in that, The voltage regulating module includes: a voltage regulator; The two ends of the voltage regulator serve as the input and output terminals of the voltage regulating module, respectively.

4. The damping capacitance durability test device for the converter valve according to claim 3, characterized in that, The voltage regulating module also includes: a transformer; The voltage regulator and the transformer are connected in series between the input and output terminals of the voltage regulating module.

5. The damping capacitance durability test apparatus for the converter valve according to claim 1, characterized in that, The current regulation module includes a reactor and a first resistor connected in series.

6. The damping capacitance durability test apparatus for the converter valve according to claim 1, characterized in that, The monitoring and analysis module includes: an analysis unit, at least two first current acquisition units, and multiple first voltage acquisition units; The first current acquisition unit is used to acquire the current corresponding to the damping capacitor; The first voltage acquisition unit is used to acquire the voltage corresponding to the damping capacitor; The analysis unit is used to analyze and record the data output by each of the first current acquisition units and each of the first voltage acquisition units.

7. The damping capacitance durability test apparatus for the converter valve according to claim 6, characterized in that, The monitoring and analysis module further includes: a second current acquisition unit and a second voltage acquisition unit; The second current acquisition unit is used to acquire the current of the series branch; The second voltage acquisition unit is used to acquire the series voltage of each thyristor in the series branch.

8. The damping capacitance durability test apparatus for a converter valve according to any one of claims 1 to 7, characterized in that, The damping capacitor durability test device also includes: a commutation simulation branch; The commutation simulation branch is connected in parallel with at least each of the thyristors connected in series in the series branch; The commutation simulation branch is used to simulate the voltage changes caused by commutation of other bridge arms in the converter where the commutation valve is located.

9. The damping capacitance durability test apparatus for the converter valve according to claim 8, characterized in that, The commutation simulation branch includes a switching transistor, a second resistor, and a diode connected in series.

10. The damping capacitance durability test apparatus for a converter valve according to any one of claims 1 to 7, characterized in that, The damping capacitor durability testing device also includes: a switch; The switch is connected between the AC power source and the voltage regulating module.

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