Converter valve operation test system and charging and discharging method thereof

Abstract

According to the converter valve operation test system and the charging and discharging method thereof provided by the invention, on the system level, the series design of the first valve string and the second valve string is combined with the parallel configuration of the auxiliary sub-module and the bidirectional controllable direct-current power supply, so that a charging mechanism without an external alternating-current power supply is realized, and the hardware cost and the land occupation demand are reduced. According to the method level, according to the staged charging process, the safety and efficiency of the charging process are ensured through voltage regulation, submodule sequential input, electric reactor auxiliary charging and synchronous control expansion of the number of input modules; according to the discharging process, controllable release of energy is achieved through locking of trigger pulses, staged voltage reduction and an energy release mechanism. In addition, the pre-detection, real-time monitoring and dynamic adjustment mechanism further improves the robustness and adaptive ability of the system. While the system structure is simplified, the efficiency, the safety and the economical efficiency of the converter valve test are remarkably improved, and efficient and reliable test support is provided for research, development and production of the flexible converter valve.

Description

Technical Field

[0001] The present application relates to the field of flexible DC converter valves, and in particular to a converter valve operation test system and a charging and discharging method thereof. Background Art

[0002] During the development and production of flexible converter valves, necessary testing is required for the valve section, with operational testing being a key component. According to national standards, converter valves should undergo operational testing before commissioning to verify their ability to withstand critical stresses such as current, voltage, and heat under long-term, actual operating conditions.

[0003] However, existing flexible direct current converter valve test systems require an additional AC charging power supply in the charging circuit, which is disconnected upon startup. This results in low equipment utilization and the additional space required for the power supply, resulting in excessively high hardware costs. Therefore, a converter valve operation test system and method are needed that can charge the valve train without an AC charging power supply. This would reduce costs while improving the efficiency and effectiveness of the converter valve testing process. Summary of the Invention

[0004] The purpose of this application is to solve at least one of the above-mentioned technical deficiencies, especially the technical deficiencies in the prior art of the converter valve operation test system having a complex structure and high hardware cost.

[0005] In a first aspect, the present application provides a converter valve operation test system, comprising:

[0006] A first valve string and a second valve string, each valve string comprising a plurality of submodules, the submodules of each valve string being connected in series, an auxiliary submodule being provided at a first end of the first valve string, the first end of the first valve string and the first end of the second valve string being interconnected and grounded;

[0007] Wherein, the submodule includes a full-bridge module or a half-bridge module;

[0008] A bidirectional controllable DC power supply is connected in parallel to both ends of the auxiliary submodule;

[0009] Wherein, the voltage of the bidirectional controllable DC power supply is adjustable and matches the operating voltage of the system;

[0010] a reactor connected between the second end of the first valve string and the second end of the second valve string;

[0011] a discharge resistor connected in series with the bidirectional controllable DC power supply;

[0012] A first switch and a second switch, wherein the first switch is connected in parallel with the discharge resistor, and the second switch is connected in series with the discharge resistor.

[0013] In a second aspect, the application provides a charging method for a converter valve operation test system, which is applied to the system as described in the first aspect, and the method comprises:

[0014] adjusting the output voltage of the bidirectional controllable DC power supply to the rated operating voltage of the sub-modules;

[0015] closing the second switch to apply an initial voltage to the auxiliary sub-modules and the second valve string by the bidirectional controllable DC power supply;

[0016] sequentially putting the sub-modules of the second valve string into operation according to a preset sequence until the voltage of all the sub-modules in the second valve string reaches the rated operating voltage of the sub-modules;

[0017] putting a preset number of sub-modules in the second valve string into operation to charge the first valve string through the reactor;

[0018] synchronously controlling the switch tubes of the first valve string and the second valve string, gradually expanding the number of sub-modules put into operation in the first valve string and the second valve string, and closing the first switch to start the converter valve operation test system after the charging of all the sub-modules in the first valve string and the second valve string is completed.

[0019] As an optional implementation, the synchronous control of the switch tubes of the first valve string and the second valve string and the gradual expansion of the number of sub-modules put into operation in the first valve string and the second valve string comprise:

[0020] initially putting two sub-modules into operation in both the first valve string and the second valve string, and increasing the number of sub-modules put into operation according to a preset time interval until all the sub-modules in the first valve string and the second valve string are put into operation;

[0021] and, during the increasing of the number of sub-modules, if the difference between the capacitance voltages of the sub-modules put into operation in any valve string exceeds a safety threshold, the expansion of the number of sub-modules is paused and the voltage equalization control in the valve string is triggered.

[0022] As an optional implementation, before the adjustment of the output voltage of the bidirectional controllable DC power supply to the rated operating voltage of the sub-modules, the method further comprises a pre-detection step, specifically comprising:

[0023] detecting the initial capacitance voltage of each sub-module in the first valve string and the second valve string;

[0024] if the initial capacitance voltage of any sub-module is abnormal, triggering a pre-discharge process until the capacitance voltage of each sub-module reaches a safety range.

[0025] As an optional implementation, the method further comprises:

[0026] Real-time monitor the capacitor voltage of each of the sub-modules;

[0027] If the voltage fluctuation exceeds the safety threshold, suspend the corresponding sub-module input process, and dynamically adjust the output voltage of the bidirectional controllable DC power supply.

[0028] The second aspect of the application provides a discharge method of a converter valve operation test system, which is applied to the system of the first aspect, and the method comprises the following steps:

[0029] Lock all sub-module trigger pulses and disconnect the first switch;

[0030] Trigger the switch tube connected in series with the capacitor in each of the sub-modules in the second valve string to conduct, reduce the voltage of the bidirectional controllable DC power supply to zero in stages, and then trigger all the sub-modules in the first valve string and the second valve string to release the remaining energy through the discharge resistor.

[0031] As an optional implementation, the method further comprises the following steps:

[0032] When the capacitor voltage of each of the sub-modules is discharged to a preset value, lock the trigger pulse of the second valve string, disconnect the second switch until the discharge of all the sub-modules in the first valve string and the second valve string is completed.

[0033] As an optional implementation, after the step of locking the trigger pulse of the second valve string when the capacitor voltage of each of the sub-modules is discharged to a preset value, the method further comprises the following steps:

[0034] Detect the residual voltage of each of the sub-modules;

[0035] If the capacitor voltage of any sub-module is higher than the safety threshold, keep the second switch closed and continue discharging until the corresponding capacitor voltage is reduced to below the safety threshold.

[0036] In the third aspect, the application provides a computer device, which comprises one or more processors and a memory, and the memory stores computer readable instructions, and the computer readable instructions are executed by the one or more processors to perform the steps of the method of the second aspect.

[0037] In the fourth aspect, the application provides a storage medium, which stores computer readable instructions, and the computer readable instructions are executed by one or more processors to make the one or more processors perform the steps of the method of the second aspect.

[0038] From the above technical solutions, it can be seen that the embodiments of the application have the following advantages:

[0039] Based on any of the above embodiments, the converter valve operation test system and the charging and discharging method provided by the application solve the problems of high hardware cost and low equipment utilization caused by the dependence on an additional AC charging power supply through structure optimization and method innovation. At the system level, the series connection design of the first valve string and the second valve string in combination with the parallel configuration of the auxiliary sub-module and the bidirectional controllable DC power supply realizes a charging mechanism without an external AC power supply, significantly reducing the hardware cost and land requirement. At the method level, the phased charging process expands the number of modules through voltage regulation, sequential sub-module investment, reactor auxiliary charging, and synchronous control, ensuring the safety and efficiency of the charging process; the discharging process realizes controllable energy release through latching trigger pulses, phased voltage reduction, and energy release mechanisms. In addition, the pre-detection, real-time monitoring, and dynamic adjustment mechanisms further improve the robustness and adaptive ability of the system. Overall, the application simplifies the system structure while significantly improving the efficiency, safety, and economy of the converter valve test, providing efficient and reliable test support for the research and production of flexible converter valves. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0041] Figure 1 The structural schematic diagram of the related technology of the converter valve operation test system provided by an embodiment of the application is shown in the figure.

[0042] Figure 2 The structural schematic diagram of the converter valve operation test system provided by an embodiment of the application is shown in the figure.

[0043] Figure 3 The internal structure diagram of the computer device provided by an embodiment of the application is shown in the figure. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, not all. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0045] In high-voltage direct-current engineering, the converter valve is generally composed of full-bridge modules and half-bridge modules, which is called flexible direct-current converter valve. In the process of product research and development and production, the valve section needs to be tested, and the operation test is one of the important tests. According to the national standard, the converter valve should be tested before being put into use, in order to test the resistance of the valve group to current, voltage and heat and other key stresses under long-term actual operation conditions.

[0046] Please refer to Figure 1 , Figure 1 The structure diagram of the related technology of the converter valve operation test system provided by an embodiment of the present application is shown in the figure, Figure 1 A feasible converter valve operation test system is shown, which is composed of two valve strings, load reactors, AC charging power supply, DC power supply and the like. The specific test process is to control the AC charging power supply to charge the test product sub-module capacitor voltage to the set value first, and then the AC charging power supply is withdrawn, and the sub-module relies on the DC power supply to supplement the energy and maintain the capacitor voltage stable. The test can form a power cycle between the two valve strings by controlling the amplitude and phase of the output voltage of the two valve strings, and then test the valve string. The DC power supply only supplements the loss power in the power cycle. After waiting for the test to be completed, all power units are immediately locked, and slow discharge is performed by relying on the voltage balancing resistor in the power unit. Generally, the discharge can be completed after tens of minutes.

[0047] Therefore, the existing flexible direct-current converter valve test system needs to configure an additional AC charging power supply in the charging circuit, which is cut off after starting. The utilization rate of the equipment is not high, and the power supply needs to occupy additional land. The converter valve operation test system proposed in the present application does not need an AC charging power supply to charge the valve string, and can realize fast discharge at the end of the test. The test system is simple, and the test and production efficiency of the converter valve is improved.

[0048] In summary, the technical concept of the present application is that the converter valve operation test system and the charging and discharging method of the present application comprehensively solve the problem of high hardware cost and low equipment utilization caused by the dependence on an additional alternating current charging power supply through structure optimization and method innovation. At the system level, the series connection of the first valve string and the second valve string combined with the parallel connection of the auxiliary sub-module and the bidirectional controllable direct current power supply realizes the charging mechanism without external alternating current power supply, significantly reducing the hardware cost and land requirement. At the method level, the phased charging process expands the number of modules through voltage regulation, sequential sub-module investment, reactor auxiliary charging, and synchronous control, ensuring the safety and efficiency of the charging process; the discharging process realizes controllable energy release through latching trigger pulse, phased voltage reduction, and energy release mechanism. In addition, the pre-detection, real-time monitoring, and dynamic adjustment mechanism further improves the robustness and adaptive ability of the system. Overall, the present application simplifies the system structure while significantly improving the efficiency, safety, and economy of the converter valve test, providing efficient and reliable test support for the research and production of flexible converter valves.

[0049] The method provided by the present application is described in detail below according to the corresponding embodiments in some practical application scenarios.

[0050] The present application provides a converter valve operation test system, which comprises:

[0051] A first valve string and a second valve string, each valve string comprising a plurality of sub-modules, each sub-module of each valve string being connected in series, and an auxiliary sub-module being arranged at a first end of the first valve string, the first end of the first valve string and the first end of the second valve string being connected to each other and grounded;

[0052] Wherein, the sub-module comprises a full-bridge module or a half-bridge module;

[0053] A bidirectional controllable direct current power supply is connected in parallel across the auxiliary sub-module;

[0054] Wherein, the voltage of the bidirectional controllable direct current power supply is adjustable and matches the operating voltage of the system;

[0055] An electric reactor is connected between the second end of the first valve string and the second end of the second valve string;

[0056] A discharging resistor is connected in series with the bidirectional controllable direct current power supply;

[0057] A first switch and a second switch, the first switch being connected in parallel with the discharging resistor, and the second switch being connected in series with the discharging resistor.

[0058] Specifically, based on the actual application scenario, please refer to Figure 2 , Figure 2The structure schematic diagram of the converter valve operation test system provided by an embodiment of the present application is composed of a first valve string composed of a reactor L, sub-modules SM1-SM5, a second valve string composed of sub-modules SM6-SM10, a bidirectional controllable direct current power supply E, and a first switch S1 and a second switch S2 and a discharge resistor Rs. It should be noted that:

[0059] In actual application scenarios, the number of modules on the two valve strings is at least greater than 5, and can be composed of full-bridge modules, half-bridge modules or a mixture of the two. This diagram takes 5 half-bridge modules as an example. The specific description of the method side implementation in the present application is also based on this structure.

[0060] The module SM5 is an auxiliary sub-module, and the direct current power supply E connected in parallel at the direct current side is a bidirectional controllable direct current power supply, that is, it has the functions of charging and discharging, and the voltage is adjustable, the highest voltage can cover the highest operating voltage of the power module, and the charging power is greater than the loss power in the operation process of the test system device. The function of the bidirectional controllable direct current power supply E is to charge the system at the beginning of the test, supplement the loss power during operation, and accelerate the discharge of the system at the end of the test.

[0061] In Figure 2 , the first end of the auxiliary sub-module side, that is, the first valve string and the second valve string, is connected to each other and grounded, and the reactor end, that is, the second end of the first valve string and the second valve string.

[0062] The converter valve operation test system provided by the present application realizes the charging mechanism without additional configuration of an alternating current charging power supply through the design of the series connection of the first valve string and the second valve string, the setting of the auxiliary sub-module at the end of the first valve string, and the parallel connection of the bidirectional controllable direct current power supply at both ends of the auxiliary sub-module. The voltage adjustable characteristic of the bidirectional controllable direct current power supply matches the system operating voltage, ensuring that the charging process is consistent with the actual working condition; the reactor is connected between the two valve strings to provide current buffer for the charging process; the discharge resistor is connected in series with the bidirectional controllable direct current power supply, and cooperates with the phased control of the first switch and the second switch to realize the controllable release of energy. The synergistic effect of the above technical features effectively solves the problem of high hardware cost and low equipment utilization caused by the dependence on additional alternating current charging power supply in the prior art, simplifies the system structure, and improves the practicality and economy of the test system.

[0063] Correspondingly, the present application provides a charging method for a converter valve operation test system, which is applied to the system as described in any of the embodiments, and the method comprises:

[0064] Adjusting the output voltage of the bidirectional controllable direct current power supply to the rated operating voltage of the sub-module;

[0065] Closing the second switch to apply an initial voltage to the auxiliary sub-module and the second valve string by the bidirectional controllable direct current power supply.

[0066] At this time, each submodule (the capacitor corresponding to the submodule) in the second valve string is charged to 1 / 5 of the rated operating voltage, and the second valve string is activated at this time.

[0067] According to the preset sequence, the submodules of the second valve string are sequentially put in until the voltage of all the submodules in the second valve string reaches the rated operating voltage of the submodule;

[0068] In an actual application scenario, in Figure 2 Under the structure shown, the preset sequence can be from the second end to the first end, that is, SM6 is sequentially put in one by one until SM10 is charged, and the five submodules are all charged from 1 / 5 of the rated operating voltage to the vicinity of the rated operating voltage.

[0069] A preset number of submodules in the second valve string are put in to charge the first valve string through the reactor;

[0070] The preset number can be 2 in an actual application scenario, that is, any two submodules are put in to charge the submodules other than the auxiliary submodule in the first valve string.

[0071] The switch tubes of the first valve string and the second valve string are synchronously controlled, the number of modules put in the first valve string and the second valve string is gradually expanded, and after all the submodules of the first valve string and the second valve string are charged, the first switch is closed and the converter valve operation test system is started.

[0072] The charging method provided in the application adjusts the output voltage of the bidirectional controllable direct-current power supply to the rated operating voltage of the submodule, and closes the second switch to apply an initial voltage to the auxiliary submodule and the second valve string, thereby realizing preliminary charging of the valve string. Subsequently, the submodules of the second valve string are sequentially put in according to the preset sequence to ensure that the voltage of all the submodules reaches the rated value; then, a preset number of submodules are put in to charge the first valve string through the reactor. Finally, the switch tubes of the two valve strings are synchronously controlled to gradually expand the number of modules put in, and the first switch is closed to start the test after charging is completed. The method avoids voltage mutation and current impact through a phased and sequential charging process, thereby improving the safety and efficiency of the charging process.

[0073] As an optional implementation, the synchronous control of the switch tubes of the first valve string and the second valve string to gradually expand the number of modules put in the first valve string and the second valve string includes:

[0074] Initially, two submodules are put in the first valve string and the second valve string, and the number of modules put in is increased according to a preset time interval until all the submodules of the first valve string and the second valve string are put in;

[0075] And, in the process of incrementally putting the sub-modules into operation, when the difference between the capacitance voltages of the sub-modules in any valve string exceeds a safety threshold, the expansion of the number of sub-modules is suspended and the voltage equalization control in the valve string is triggered.

[0076] In this embodiment, the number of sub-modules in operation in the two valve strings is controlled in real time according to the charging rate and the charging condition of each sub-module.

[0077] In the process of synchronously controlling the switching tubes of the two valve strings, the initial number of sub-modules put into operation is two and the number is gradually increased, and the expansion mechanism of the preset time interval is combined to realize the smooth input of the sub-modules. In addition, when it is detected that the difference between the capacitance voltages of the sub-modules in any valve string exceeds a safety threshold, the expansion is suspended and the voltage equalization control is triggered. This design ensures the balance of the voltage during charging, prevents the device from being damaged or the system from failing due to excessive voltage difference, and further improves the reliability of the system.

[0078] As an optional embodiment, before adjusting the output voltage of the bidirectional controllable direct current power supply to the rated operating voltage of the sub-modules, the method further comprises a pre-detection step, specifically comprising:

[0079] Detecting the initial capacitance voltage of each sub-module in the first valve string and the second valve string;

[0080] If the initial capacitance voltage of any sub-module is abnormal, a pre-discharge process is triggered until the capacitance voltage of each sub-module reaches a safe range.

[0081] Before adjusting the voltage of the bidirectional controllable direct current power supply, the pre-detection step is used to detect the conduction state of the diode and the switching tube and the initial capacitance voltage of each sub-module. If the initial conduction state of the diode and the switching tube is found to be abnormal, the device can be repaired and replaced, or the voltage condition can be further tested. If the voltage is found to be abnormal, a pre-discharge process is triggered until the capacitance voltage returns to a safe range. In this way, potential failure risks can be eliminated before charging to ensure circuit safety and provide a stable foundation for subsequent charging process, thereby improving the robustness and test success rate of the system.

[0082] As an optional embodiment, the method further comprises:

[0083] Real-time monitoring of the capacitance voltage of each sub-module;

[0084] If the voltage fluctuation exceeds a safety threshold, the input process of the corresponding sub-module is suspended, and the output voltage of the bidirectional controllable direct current power supply is dynamically adjusted.

[0085] The embodiment monitors the capacitor voltage of each sub-module in real time, suspends the input of the corresponding sub-module when the voltage fluctuation exceeds the safety threshold, and dynamically adjusts the output voltage of the bidirectional controllable direct current power supply. The mechanism can respond to voltage abnormalities in time, avoid local overvoltage or undervoltage problems, ensure the stability of the charging process, and improve the adaptive ability of the system.

[0086] Correspondingly, the application provides a discharge method of a converter valve operation test system, which is applied to the system as described in any of the embodiments of the application, and the method comprises:

[0087] locking all sub-module trigger pulses and disconnecting the first switch;

[0088] triggering the switch tube connected in series with the capacitor in each sub-module in the second valve string to conduct, reducing the voltage of the bidirectional controllable direct current power supply to zero in stages, and then triggering all the sub-modules in the first valve string and the second valve string to release the residual energy through the discharge resistor.

[0089] The discharge method provided by the application blocks the energy input by locking all sub-module trigger pulses and disconnecting the first switch, then triggers the first switch tube of the second valve string sub-module to conduct, reduces the voltage of the bidirectional controllable direct current power supply to zero in stages, and finally releases the residual energy through the discharge resistor. The method realizes the controllable release of energy in stages, avoids the damage of devices or the impact of the system caused by sudden energy release, and ensures the safety of the discharge process.

[0090] As an optional embodiment, the method further comprises:

[0091] locking the trigger pulse of the second valve string and disconnecting the second switch until all the sub-modules in the first valve string and the second valve string complete the discharge when the capacitor voltage of each sub-module is discharged to a preset value.

[0092] The embodiment locks the trigger pulse of the second valve string and disconnects the second switch until all the sub-modules complete the discharge when the capacitor voltage of each sub-module is discharged to a preset value. By locking and disconnecting in stages, the discharge end point is accurately controlled, the energy backflow or device damage caused by excessive residual voltage is prevented, and the integrity of the discharge process is further improved.

[0093] As an optional embodiment, after locking the trigger pulse of the second valve string when the capacitor voltage of each sub-module is discharged to a preset value, the method further comprises:

[0094] detecting the residual voltage of each sub-module;

[0095] If the voltage of any sub-module capacitor is higher than the safety threshold, the second switch is kept closed and the discharge continues until the corresponding capacitor voltage is reduced below the safety threshold.

[0096] In this embodiment, the residual voltage of each sub-module is detected in real time during the discharge process. If the voltage of any sub-module capacitor is higher than the safety threshold, the second switch is kept closed and the discharge continues until the corresponding capacitor voltage is reduced below the safety threshold. This mechanism ensures that the residual energy of all sub-modules is completely discharged through dynamic monitoring and active intervention, eliminating safety hazards and improving the safety redundancy of the system.

[0097] The above embodiments can be combined or reasonably extended based on actual application scenarios. Based on the structure given below, the charging and discharging processes are further described. Figure 2

[0098] During the charging process, at the start, the second switch S2 is first closed, and the bidirectional controllable DC power supply E is boosted to the rated operating voltage of the sub-modules, charging the auxiliary sub-module SM5 and the second valve string. The charging circuit is formed through the diodes D1 of each sub-module in the first valve string and the second valve string. The capacitors of each sub-module in the second valve string can be charged to 1 / 5 of the rated operating voltage of the sub-modules. At this time, the second valve string has been started, its auxiliary power supply is working normally, and its switch tube can be driven.

[0099] Then, by controlling the switch tubes in the second valve string, the sub-modules SM6-SM10 are sequentially put into operation, one module at a time. In this way, each sub-module in the second valve string is charged to the vicinity of the rated operating voltage of the sub-modules.

[0100] Then, the switch tubes of the second valve string are controlled to put in any two sub-modules. At this time, SM1-SM4 in the first valve string are charged, and the charging circuit is the diode D1 in the first valve string. At this time, the first valve string has been started, its auxiliary power supply is working normally, and its switch tube can be driven.

[0101] Finally, the switch tubes of the first valve string and the second valve string are controlled to pulse, and each valve string is put into the same number of sub-modules at a time. In this example, 2, 3, 4, and 5 sub-modules are put in. After all the sub-modules in the two valve strings are charged, the first switch S1 is closed, and the valve string completes the starting process.

[0102] After the test is completed, discharge is performed, and the trigger pulses of all sub-modules are first locked.

[0103] Then, the first switch S1 is opened;

[0104] ​Then, the pulse of each sub-module T1 tube in the second valve string is triggered, and the voltage of the bidirectional controllable direct current power supply E is slowly reduced to 0V. At this time, the voltage of all sub-module capacitors will discharge to the discharge resistor Rs. Until the voltage of the capacitor is reduced to close to the lower limit of the working voltage of the sub-module power supply, the trigger pulse of the second valve string is blocked, the second switch S2 is turned off, and the discharge process is completed after the residual sub-module voltage is naturally discharged.

[0105] As shown schematically in Figure 3 , Figure 3 An internal structure schematic diagram of a computer device provided by the embodiment of the present application is shown in the figure. The computer device 300 can be provided as a server. Referring to Figure 3 , the computer device 300 includes a processing component 302, which further includes one or more processors, and a memory resource represented by a memory 301, for storing instructions executable by the processing component 302, such as an application program. The application program stored in the memory 301 can include one or more than one module each corresponding to a set of instructions. In addition, the processing component 302 is configured to execute the instructions to perform the method of any of the above embodiments.

[0106] The computer device 300 can also include a power supply component 303 configured to perform power management of the computer device 300, a wired or wireless network interface 304 configured to connect the computer device 300 to a network, and an input / output (I / O) interface 305. The computer device 300 can operate based on an operating system stored in the memory 301, such as Windows Server TM, Mac OS X TM, Unix TM, Linux TM, Free BSD TM or the like.

[0107] Those skilled in the art can understand that Figure 3 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. A specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0108] The embodiment of the present application provides a storage medium, and the storage medium stores computer readable instructions. When the computer readable instructions are executed by one or more processors, the one or more processors execute the method provided by any of the embodiments.

[0109] Finally, it should be noted that the terms "first", "second", and the like, herein do not denote any order, quantity, combination, or importance, but rather are used to distinguish one element from another, and are not intended to denote the presence of any such actual relationship or order. Moreover, the terms "include", "have", or any other variant thereof are intended to encompass non-exclusive inclusions, such that processes, methods, articles, or apparatuses that comprise a list of elements are not required to comprise only those elements in the list, but can include other elements not expressly listed, or also include elements inherent in such processes, methods, articles, or apparatuses. Without additional restrictions, an element preceded by "comprises... a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the stated element.

[0110] The various embodiments in the specification are described in progressive order with each embodiment building on one or more of the previous embodiments, however the order of the embodiments described is not intended to be construed as a requirement or limitation for these embodiments. Any one or more of the embodiments described with reference to a particular set of one or more other embodiments are optionally employable together with one or more other embodiments and / or in any appropriate combination.

[0111] The above description of disclosed embodiments is intended to enable those skilled in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended 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 converter valve operation test system, characterized in that: include: A first valve string and a second valve string, each valve string comprising a plurality of submodules, the submodules of each valve string being connected in series, an auxiliary submodule being provided at a first end of the first valve string, the first end of the first valve string and the first end of the second valve string being interconnected and grounded; Wherein, the submodule includes a full-bridge module or a half-bridge module; A bidirectional controllable DC power supply is connected in parallel to both ends of the auxiliary submodule; Wherein, the voltage of the bidirectional controllable DC power supply is adjustable and matches the operating voltage of the system; a reactor connected between the second end of the first valve string and the second end of the second valve string; a discharge resistor connected in series with the bidirectional controllable DC power supply; A first switch and a second switch, wherein the first switch is connected in parallel with the discharge resistor, and the second switch is connected in series with the discharge resistor.

2. A charging method for a converter valve operation test system, characterized in that: The method is applied to the system according to claim 1, and the method comprises: Adjust the output voltage of the bidirectional controllable DC power supply to the rated operating voltage of the submodule; Closing the second switch, and applying an initial voltage to the auxiliary submodule and the second valve string through the bidirectional controllable DC power supply; The submodules of the second valve string are put into operation in sequence according to a preset order until the voltage of all submodules in the second valve string reaches the rated operating voltage of the submodule; Putting into operation a preset number of submodules in the second valve string to charge the first valve string through the reactor; Synchronously control the switch tubes of the first valve string and the second valve string, gradually expand the number of modules put into use of the first valve string and the second valve string, until all sub-modules of the first valve string and the second valve string are fully charged, close the first switch, and start the converter valve operation test system.

3. The method according to claim 2, characterized in that The synchronously controlling the switch tubes of the first valve string and the second valve string and gradually expanding the number of input modules of the first valve string and the second valve string includes: Initially, two submodules are added to each of the first valve string and the second valve string, and the number of submodules added is increased incrementally according to a preset time interval until all submodules of the first valve string and the second valve string are added; Furthermore, during the process of incrementally adding submodules, when the capacitor voltage difference of each submodule put into operation in any valve string exceeds a safety threshold, the expansion of the number of submodules is suspended and the pressure equalization control within the valve string is triggered.

4. The method according to claim 2, characterized in that Before adjusting the output voltage of the bidirectional controllable DC power supply to the rated operating voltage of the submodule, the method further includes a pre-detection step, specifically comprising: detecting an initial capacitor voltage of each of the submodules in the first valve string and the second valve string; If the initial capacitor voltage of any submodule is abnormal, the pre-discharge process is triggered until the capacitor voltage of each submodule reaches a safe range.

5. The method according to any one of claims 2 to 4, characterized in that: The method further comprises: Real-time monitoring of the capacitor voltage of each submodule; If the voltage fluctuation exceeds the safety threshold, the activation process of the corresponding submodule is suspended, and the output voltage of the bidirectional controllable DC power supply is dynamically adjusted.

6. A discharge method for a converter valve operation test system, characterized in that: The method is applied to the system according to claim 1, and the method comprises: Blocking all submodule trigger pulses and disconnecting the first switch; The switch tube connected in series with the capacitor in each sub-module in the second valve string is triggered to turn on, and the voltage of the bidirectional controllable DC power supply is reduced to zero in stages. Then, all the sub-modules in the first valve string and the second valve string are triggered to release the remaining energy through the discharge resistor.

7. The method according to claim 6, characterized in that The method further comprises: When the capacitor voltage of each submodule is discharged and reaches a preset value, the trigger pulse of the second valve string is blocked and the second switch is disconnected until all submodules of the first valve string and the second valve string are discharged.

8. The method according to claim 7, characterized in that After the trigger pulse of the second valve string is blocked when the capacitor voltage of each submodule is discharged to a preset value, the method further includes: detecting the residual voltage of each of the submodules; If the capacitor voltage of any submodule is higher than the safety threshold, the second switch is kept closed and discharge is continued until the corresponding capacitor voltage drops below the safety threshold.

9. A computer device, characterized in that: The method comprises one or more processors and a memory, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the one or more processors, the steps of the method according to any one of claims 2 to 5 or any one of claims 6 to 8 are performed.

10. A storage medium, characterized in that: The storage medium stores computer-readable instructions, which, when executed by one or more processors, enable the one or more processors to perform the steps of the method according to any one of claims 2 to 5 or any one of claims 6 to 8.

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