A Transmission Control Method, System, Device and Medium for a Hybrid Series-Parallel Converter Valve Topology

Abstract

The present invention relates to the technical field of power transmission systems, and provides a power transmission control method, system, device and medium for a hybrid series-parallel converter valve topology. The method is based on the total number of sub-modules in a single bridge arm of the hybrid series-parallel converter valve topology, which includes a number of IGBT sub-modules and IGCT sub-modules connected in series and has a main wiring adopting a pseudo-bipolar structure, and the usage ratio of IGCT sub-modules. Based on the principle of nearest level approximation modulation, the real-time number of sub-modules put into operation in the upper bridge arm and the real-time number of sub-modules put into operation in the lower bridge arm of the hybrid series-parallel converter valve topology are calculated, and power transmission control is executed according to the real-time number of sub-modules put into operation in the upper bridge arm and the real-time number of sub-modules put into operation in the lower bridge arm. The present invention can realize the complementary advantages of insulated gate bipolar transistors and integrated gate-commutated thyristors based on the flexible ratio of IGBT sub-modules and IGCT sub-modules, which can not only ensure the DC power transmission performance of the power transmission system, but also greatly reduce the construction cost of the flexible DC converter station.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission systems, and particularly to a power transmission control method, system, device and medium for a hybrid converter valve topology. Background Art

[0002] The flexible DC power transmission technology is one of the important technologies for adapting to the development of new power systems. With the increasing demand for large-scale new energy development and transmission, the core role of flexible DC power transmission in DC power transmission technology will become more prominent.

[0003] The main component device of the current flexible DC power transmission technology is the insulated gate bipolar transistor (IGBT) converter valve, which is a high-performance power semiconductor device. However, it is also restricted by various application requirements such as the construction, cost, and production capacity of DC power transmission projects due to its weaknesses in reverse voltage withstand ability, large operating losses, small transmission capacity, prone to latching phenomenon, and high cost. Although the integrated gate-commutated thyristor (IGCT) converter valve, as an improved new topology, has advantages such as high voltage withstand ability, large power capacity, low conduction loss, small volume, and high reliability, it still has application defects such as switching frequency limitations, special requirements for drive circuits, poor waveform quality, and high maintenance costs, and cannot directly replace the use of IGBT converter valves in power transmission systems. Therefore, it is of great significance to realize the complementary advantages based on the respective advantages of IGBT converter valves and IGCT converter valves to facilitate the low-cost construction of large-capacity flexible DC power transmission projects and improve the power transmission performance. Summary of the Invention

[0004] The purpose of the present invention is to provide a power transmission control method for a hybrid converter valve topology. By serially using IGBT sub-modules and IGCT sub-modules to construct a hybrid converter valve topology, and based on the configuration ratio of IGBT sub-modules and IGCT sub-modules in the hybrid converter valve topology and the nearest level approximation modulation principle, reliable and stable power transmission control of the hybrid converter valve topology is carried out. It can realize the complementary advantages of insulated gate bipolar transistors and integrated gate-commutated thyristors based on the flexible ratio of IGBT sub-modules and IGCT sub-modules, not only ensuring the DC power transmission performance of the power transmission system, but also significantly reducing the construction cost of the flexible DC converter station, thereby effectively improving the economy of the flexible DC power transmission technology in large-scale new energy DC power transmission scenarios.

[0005] To achieve the above object, a power transmission control method, system, device and medium for a hybrid converter valve topology are provided.

[0006] In a first aspect, an embodiment of the present invention provides a power transmission control method for a hybrid series - parallel converter valve topology. The hybrid series - parallel converter valve topology includes a plurality of IGBT sub - modules and IGCT sub - modules used in series; the main wiring of the hybrid series - parallel converter valve topology adopts a pseudo - bipolar structure; the method includes the following steps:

[0007] Based on the total number of sub - modules in a single - bridge arm of the hybrid series - parallel converter valve topology and the usage ratio of IGCT sub - modules, calculate the real - time number of sub - modules put into operation in the upper bridge arm and the real - time number of sub - modules put into operation in the lower bridge arm of the hybrid series - parallel converter valve topology based on the principle of nearest - level approximation modulation;

[0008] Execute power transmission control according to the real - time number of sub - modules put into operation in the upper bridge arm and the real - time number of sub - modules put into operation in the lower bridge arm.

[0009] Furthermore, the total number of sub - modules in a single - bridge arm of the hybrid series - parallel converter valve topology is calculated based on the target flexible DC output voltage, the voltage of a single sub - module, and Kirchhoff's voltage law.

[0010] Furthermore, the number of IGBT single - bridge - arm sub - modules and the number of IGCT single - bridge - arm sub - modules in the hybrid series - parallel converter valve topology are determined through the following steps:

[0011] When the usage ratio of the IGCT sub - modules is less than the preset replacement ratio, based on the product of the total number of sub - modules in a single - bridge arm and the usage ratio of the IGCT sub - modules, obtain the number of IGCT single - bridge - arm sub - modules, and according to the difference between the total number of sub - modules in a single - bridge arm and the number of IGCT single - bridge - arm sub - modules, obtain the number of IGBT single - bridge - arm sub - modules;

[0012] When the usage ratio of the IGCT sub - modules is greater than or equal to the preset replacement ratio, based on the total number of sub - modules in a single - bridge arm, the rated working voltage of the IGBT sub - modules, and the rated working voltage of the IGCT sub - modules, calculate the number of IGBT single - bridge - arm sub - modules and the number of IGCT single - bridge - arm sub - modules based on the inter - pole voltage constraint of a single valve group.

[0013] Furthermore, the inter - pole voltage constraint of a single valve group is expressed as:

[0014]

[0015] In the formula, and respectively represent the number of IGBT single - bridge - arm sub - modules and the number of IGCT single - bridge - arm sub - modules; and respectively represent the rated working voltage of the IGBT sub - modules and the rated working voltage of the IGCT sub - modules; represents the inter - pole voltage of a single valve group.

[0016] Further, the step of calculating the number of sub-modules actually put into operation in the upper arm and the number of sub-modules actually put into operation in the lower arm of the hybrid series-parallel converter valve topology based on the nearest level approximation modulation principle according to the total number of sub-modules in a single bridge arm of the hybrid series-parallel converter valve topology and the usage ratio of IGCT sub-modules includes:

[0017] When the usage ratio of the IGCT sub-modules is less than the preset replacement ratio, the number of sub-modules actually put into operation in the lower arm and the number of sub-modules actually put into operation in the upper arm are calculated based on the first expression according to the total number of sub-modules in a single bridge arm, the voltage between poles of a single valve group, the valve-side modulation wave voltage, and the rated operating voltage of the IGBT sub-modules; the first expression is expressed as:

[0018]

[0019] In the formula, and respectively represent the number of sub-modules actually put into operation in the lower arm and the number of sub-modules actually put into operation in the upper arm at time t when the usage ratio of the IGCT sub-modules is less than the preset replacement ratio; represents the rated operating voltage of the IGBT sub-modules; represents the voltage between poles of a single valve group; represents the valve-side modulation wave voltage; represents the total number of sub-modules in a single bridge arm;

[0020] When the usage ratio of the IGCT sub-modules is greater than or equal to the preset replacement ratio, the number of sub-modules actually put into operation in the lower arm and the number of sub-modules actually put into operation in the upper arm are obtained according to the total number of sub-modules in a single bridge arm, the preset modulation sorting strategy, and the number of sub-modules currently put into operation in the lower arm.

[0021] Further, when the preset modulation sorting strategy is to sort the IGBT sub-modules first and then the IGCT sub-modules, the step of obtaining the number of sub-modules actually put into operation in the lower arm and the number of sub-modules actually put into operation in the upper arm according to the total number of sub-modules in a single bridge arm, the preset modulation sorting strategy, and the number of sub-modules currently put into operation in the lower arm includes:

[0022] When the number of sub-modules currently put into operation in the lower arm is less than or equal to the number of IGBT sub-modules in a single bridge arm, the number of sub-modules actually put into operation in the lower arm and the number of sub-modules actually put into operation in the upper arm are calculated based on the first expression according to the total number of sub-modules in a single bridge arm, the voltage between poles of a single valve group, the valve-side modulation wave voltage, and the rated operating voltage of the IGBT sub-modules;

[0023] When the number of sub-modules put into the current lower bridge arm is greater than the number of IGBT single-bridge-arm sub-modules and the number of sub-modules put into the current lower bridge arm is less than the total number of single-bridge-arm sub-modules, based on the total number of single-bridge-arm sub-modules, the inter-pole voltage of the single valve group, the valve-side modulated wave voltage, the rated operating voltage of the IGBT sub-module, the number of IGBT single-bridge-arm sub-modules, and the rated operating voltage of the IGCT sub-module, the real-time number of sub-modules put into the lower bridge arm and the real-time number of sub-modules put into the upper bridge arm are calculated according to the second expression; the second expression is expressed as:

[0024]

[0025] In the formula, and respectively represent that the usage ratio of the IGCT sub-module is greater than or equal to the preset replacement ratio. First, sort the IGBT sub-modules. When the number of sub-modules put into the current lower bridge arm is greater than the number of IGBT single-bridge-arm sub-modules, the real-time number of sub-modules put into the lower bridge arm and the real-time number of sub-modules put into the upper bridge arm at time t; represents the rated operating voltage of the IGCT sub-module; represents the number of IGBT single-bridge-arm sub-modules.

[0026] Further, when the preset modulation sorting strategy is to sort the IGCT sub-modules first and then the IGBT sub-modules, the steps of obtaining the real-time number of sub-modules put into the lower bridge arm and the real-time number of sub-modules put into the upper bridge arm according to the total number of single-bridge-arm sub-modules, the preset modulation sorting strategy, and the number of sub-modules put into the current lower bridge arm include:

[0027] When the number of sub-modules put into the current lower bridge arm is less than or equal to the number of IGCT single-bridge-arm sub-modules, based on the total number of single-bridge-arm sub-modules, the inter-pole voltage of the single valve group, the valve-side modulated wave voltage, and the rated operating voltage of the IGCT sub-module, the real-time number of sub-modules put into the lower bridge arm and the real-time number of sub-modules put into the upper bridge arm are calculated according to the third expression; the third expression is expressed as:

[0028]

[0029] In the formula, and respectively represent that the usage ratio of the IGCT sub-module is greater than or equal to the preset replacement ratio. First, sort the IGCT sub-modules. When the number of sub-modules put into the current lower bridge arm is less than or equal to the number of IGCT single-bridge-arm sub-modules, the real-time number of sub-modules put into the lower bridge arm and the real-time number of sub-modules put into the upper bridge arm at time t; respectively represent the rated operating voltage of the IGCT sub-module;

[0030] When the number of sub - modules put into operation in the current lower bridge arm is greater than the number of sub - modules in a single IGCT bridge arm and less than the total number of sub - modules in a single bridge arm, based on the total number of sub - modules in a single bridge arm, the pole - to - pole voltage of a single valve group, the valve - side modulation wave voltage, the rated operating voltage of IGBT sub - modules, the number of sub - modules in a single IGCT bridge arm, and the rated operating voltage of IGCT sub - modules, the real - time number of sub - modules put into operation in the lower bridge arm and the real - time number of sub - modules put into operation in the upper bridge arm are calculated according to the fourth expression; the fourth expression is expressed as:

[0031]

[0032] In the formula, and respectively represent that the usage ratio of IGCT sub - modules is greater than or equal to the preset replacement ratio. First, sort the IGCT sub - modules. When the number of sub - modules put into operation in the current lower bridge arm is greater than the number of sub - modules in a single IGCT bridge arm, the real - time number of sub - modules put into operation in the lower bridge arm and the real - time number of sub - modules put into operation in the upper bridge arm at time t; represents the number of sub - modules in a single IGCT bridge arm.

[0033] In a second aspect, an embodiment of the present invention provides a power transmission control system for a hybrid - series converter valve topology. The hybrid - series converter valve topology includes a plurality of IGBT sub - modules and IGCT sub - modules used in series; the main wiring of the hybrid - series converter valve topology adopts a pseudo - bipolar structure; the system includes:

[0034] A sub - module input analysis module, configured to calculate the real - time number of sub - modules put into operation in the upper bridge arm and the real - time number of sub - modules put into operation in the lower bridge arm of the hybrid - series converter valve topology based on the total number of sub - modules in a single bridge arm of the hybrid - series converter valve topology and the usage ratio of IGCT sub - modules according to the nearest - level approximation modulation principle;

[0035] A power transmission control module, configured to perform power transmission control according to the real - time number of sub - modules put into operation in the upper bridge arm and the real - time number of sub - modules put into operation in the lower bridge arm.

[0036] In a third aspect, an embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps of the above - mentioned method are implemented.

[0037] In a fourth aspect, an embodiment of the present invention further provides a computer - readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above - mentioned method are implemented.

[0038] The present invention provides a power transmission control method, system, device, and medium for a hybrid series-parallel converter valve topology. By this method, a number of IGBT sub-modules and IGCT sub-modules are used in series, and a pseudo-bipolar structure is adopted as the main wiring design to obtain the hybrid series-parallel converter valve topology. According to the total number of sub-modules in a single bridge arm of the hybrid series-parallel converter valve topology and the usage ratio of IGCT sub-modules, the real-time number of sub-modules put into operation in the upper bridge arm and the real-time number of sub-modules put into operation in the lower bridge arm of the hybrid series-parallel converter valve topology are calculated based on the principle of nearest level approximation modulation, and power transmission control is executed according to the real-time number of sub-modules put into operation in the upper bridge arm and the real-time number of sub-modules put into operation in the lower bridge arm. Compared with the prior art, the power transmission control method for this hybrid series-parallel converter valve topology can achieve the complementary advantages of insulated gate bipolar transistors and integrated gate-commutated thyristors based on the flexible ratio of IGBT sub-modules and IGCT sub-modules. It can not only ensure the DC power transmission performance of the power transmission system, but also greatly reduce the construction cost of the flexible DC converter station, thereby effectively improving the economy of the flexible DC power transmission technology in large-scale new energy DC power transmission scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic structural diagram of a hybrid series-parallel converter valve topology in an embodiment of the present invention;

[0040] Figure 2 is a schematic flowchart of power transmission control of a hybrid series-parallel converter valve topology in an embodiment of the present invention;

[0041] Figure 3 is a schematic diagram of steady-state waveforms of a hybrid series-parallel converter valve topology in an embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of waveforms of a hybrid series-parallel converter valve topology under an AC three-phase ground fault in an embodiment of the present invention;

[0043] Figure 5 is a schematic diagram of waveforms of a hybrid series-parallel converter valve topology under a valve-side three-phase ground fault in an embodiment of the present invention;

[0044] Figure 6 is a schematic diagram of waveforms of a hybrid series-parallel converter valve topology under a DC positive pole ground fault in an embodiment of the present invention;

[0045] Figure 7 is a schematic structural diagram of a power transmission control system of a hybrid series-parallel converter valve topology in an embodiment of the present invention;

[0046] Figure 8 is an internal structural diagram of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] In order to make the objectives, technical solutions, and beneficial effects of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. Obviously, the embodiments described below are part of the embodiments of the present invention and are only used to illustrate the present invention, but not to limit the scope of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0048] The power transmission control method for the hybrid series-parallel converter valve topology provided by the present invention can be understood as a technical solution that, based on the application defects of IGBT converter valves in DC power transmission technology, constructs different numbers of IGBT sub-modules and IGCT sub-modules in different ratios to obtain Figure 1 the hybrid series-parallel converter valve topology shown (Upa is the voltage of the upper arm of phase A, Usm is the voltage of a single sub-module, Uva, Uvb, and Uvc are the phase voltages on the AC sides of phases A, B, and C respectively, iva, ivb, and ivc are the line currents on the AC sides of phases A, B, and C respectively, Udc is the voltage between the poles of a single valve group, and IGCT and IGBT are sub-module types), and performs reliable power transmission control on the hybrid series-parallel converter valve topology based on the configuration ratio of IGBT sub-modules and IGCT sub-modules in combination with the nearest level approximation modulation principle; the following embodiments will detail the power transmission control method for the hybrid series-parallel converter valve topology of the present invention.

[0049] In one embodiment, as Figure 2 shown, a power transmission control method for a hybrid series-parallel converter valve topology is provided. The hybrid series-parallel converter valve topology includes a plurality of IGBT sub-modules and IGCT sub-modules connected in series; the main wiring of the hybrid series-parallel converter valve topology adopts a pseudo-bipolar structure. The method includes the following steps:

[0050] S11. Based on the total number of sub-modules in a single bridge arm of the hybrid series-parallel converter valve topology and the usage ratio of IGCT sub-modules, calculate the real-time number of sub-modules put into the upper arm and the real-time number of sub-modules put into the lower arm of the hybrid series-parallel converter valve topology based on the nearest level approximation modulation principle.

[0051] In practical applications, the total number of sub-modules in a single bridge arm of the hybrid series-parallel converter valve topology and the usage ratio of IGCT sub-modules can be determined based on the requirements of actual flexible DC power transmission projects. The hybrid series-parallel converter valve topology can be understood as a topology structure obtained by replacing some IGBT sub-modules in the topology of all IGBT sub-modules with IGCT sub-modules based on the usage ratio of IGCT sub-modules. Specifically, the total number of sub-modules in a single bridge arm of the hybrid series-parallel converter valve topology is calculated based on the target flexible DC output voltage, the voltage of a single sub-module, and Kirchhoff's voltage law, that is, the total number of sub-modules in a single bridge arm is expressed as:

[0052]

[0053] In the formula, represents the target flexible DC output voltage; represents rounding to an integer; represents the total number of single-bridge-arm sub-modules in the hybrid series-parallel converter valve topology; represents the voltage of a single sub-module, and can be calculated with reference to the rated operating voltage of an IGBT of an existing market specification (such as a 6-inch IGBT with a rated operating voltage of 4.5 kV and a rated operating current of 2 kA or 3 kA).

[0054] Considering that in practical applications, when the usage ratio of IGCT sub-modules increases to a certain extent, the corresponding increase in harmonics may lead to insufficient harmonic tolerance of the equipment, resulting in an increased risk of equipment operation. To ensure the stability of the hybrid series-parallel converter valve topology, preferably in this embodiment, different methods are adopted to determine the number of IGBT single-bridge-arm sub-modules and the number of IGCT single-bridge-arm sub-modules in the hybrid series-parallel converter valve topology based on different usage ratios of IGCT sub-modules; specifically, the number of IGBT single-bridge-arm sub-modules and the number of IGCT single-bridge-arm sub-modules in the hybrid series-parallel converter valve topology are determined through the following steps:

[0055] When the usage ratio of the IGCT sub-modules is less than the preset replacement ratio, based on the product of the total number of single-bridge-arm sub-modules and the usage ratio of the IGCT sub-modules, the number of IGCT single-bridge-arm sub-modules is obtained, and based on the difference between the total number of single-bridge-arm sub-modules and the number of IGCT single-bridge-arm sub-modules, the number of IGBT single-bridge-arm sub-modules is obtained; where the preset replacement ratio can be understood as the maximum replacement ratio that directly replaces some IGBT sub-modules in the converter valve topology using only IGBT sub-modules with an equal amount of IGCT sub-modules without causing an increase in harmonics, and can be determined according to the analysis of the actual application scenario. That is, when the usage ratio of the IGCT sub-modules is less than the preset replacement ratio, the problem of increased harmonics caused by sub-module modulation is not obvious, and an equal amount of IGCT sub-modules can be directly used to replace an equal amount of IGBT sub-modules to obtain the number of IGCT single-bridge-arm sub-modules corresponding to the hybrid series-parallel converter valve topology; it should be noted that the position of replacing IGBT sub-modules with IGCT sub-modules is arbitrary, and can be replaced centrally or dispersedly. For example, taking a DC transmission project with a single valve group of ±260 kV, a DC current of 2885 A, a DC power of 1500 MW, and a main wiring adopting a pseudo-bipolar structure as an example, if only IGBTs with a rated voltage of 2.2 kV and a rated current of 3 kA of the market specification are used, the total number of single-bridge-arm sub-modules is 238 without considering redundancy; assuming the preset replacement ratio is 2%, when 4 IGBT sub-modules are required in a single bridge arm, the converter valve parameter configuration can be directly carried out in an equal replacement manner to obtain the parameter configuration of the hybrid series-parallel converter valve topology shown in Table 1.

[0056] Parameter Configuration of the Hybrid Series-Parallel Converter Valve Topology in Table 1

[0057]

[0058] When the usage ratio of the IGCT sub-module is greater than or equal to the preset replacement ratio, according to the total number of sub-modules in a single bridge arm, the rated operating voltage of the IGBT sub-module, and the rated operating voltage of the IGCT sub-module, the number of IGBT single-bridge-arm sub-modules and the number of IGCT single-bridge-arm sub-modules are calculated based on the inter-pole voltage constraint of a single valve group; where, the inter-pole voltage constraint of a single valve group is expressed as:

[0059]

[0060] In the formula, and respectively represent the number of IGBT single-bridge-arm sub-modules and the number of IGCT single-bridge-arm sub-modules, and , represents the total number of sub-modules in a single bridge arm of the hybrid series-parallel converter valve topology; and respectively represent the rated operating voltages of the IGBT sub-module and the IGCT sub-module; represents the inter-pole voltage of a single valve group. The IGBT sub-module is usually 2.2 kV or less, and the IGCT sub-module is 3.1 kV or less. For example, if the IGBT sub-module and the IGCT sub-module each account for 50% equally, U dc = 520 kV, then by solving the above formula, A = B = 99, and taking an even number, it can be taken as 100. That is, when the IGBT sub-module and the IGCT sub-module each account for 50%, the corresponding number of IGBT single-bridge-arm sub-modules and the number of IGCT single-bridge-arm sub-modules are both 100.

[0061] After determining the total number of sub-modules in a single bridge arm, the number of IGBT single-bridge-arm sub-modules, and the number of IGCT single-bridge-arm sub-modules through the above method, the hybrid series-parallel converter valve topology that can be put into DC power transmission is obtained. After the hybrid series-parallel converter valve topology is put into use, in order to ensure its application effect, in this embodiment, preferably based on the nearest level approximation modulation principle, different sub-module input control mechanisms are designed for the usage ratio of the IGCT sub-module in the hybrid series-parallel converter valve topology. Specifically, the steps of calculating the number of sub-modules to be input in real time for the upper bridge arm and the number of sub-modules to be input in real time for the lower bridge arm of the hybrid series-parallel converter valve topology based on the nearest level approximation modulation principle according to the total number of sub-modules in a single bridge arm of the hybrid series-parallel converter valve topology and the usage ratio of the IGCT sub-module include:

[0062] When the usage ratio of the IGCT sub-module is less than the preset replacement ratio, based on the total number of sub-modules in a single bridge arm, the inter-pole voltage of a single valve group, the valve-side modulation wave voltage, and the rated operating voltage of the IGBT sub-module, the real-time number of sub-modules put into operation in the lower bridge arm and the real-time number of sub-modules put into operation in the upper bridge arm are calculated according to the first expression; among them, the first expression can be understood as a calculation formula for obtaining the optimal real-time number of sub-modules put into operation in the upper and lower bridge arms based on the nearest level approximation modulation principle (using the nearest level or the nearest voltage vector to instantaneously approximate the sine modulation wave) and combining the circuit operation mechanism of the actual hybrid series converter valve topology. And considering that when the usage ratio of the IGCT sub-module is small, the voltage division of replacing the IGCT sub-module is not much different from the voltage division of the IGBT sub-module. In order to simplify the calculation complexity of the real-time operating sub-module as much as possible and improve the calculation efficiency of the real-time operating sub-module, in this embodiment, it is preferably unified to use the rated operating voltage of the IGBT sub-module as the reference for analysis and calculation, such as Figure 1 The voltage withstand voltage of the converter valve shown is equal to U dc / 2 - U v , and at the same time, the total number of sub-modules put into operation in the upper and lower bridge arms at the same moment is always N. Therefore, the number of sub-modules put into operation in the upper and lower bridge arms can be obtained, that is, the first expression is expressed as:

[0063]

[0064] In the formula, and respectively represent the real-time number of sub-modules put into operation in the lower bridge arm and the real-time number of sub-modules put into operation in the upper bridge arm at time t when the usage ratio of the IGCT sub-module is less than the preset replacement ratio; represents the rated operating voltage of the IGBT sub-module; represents the inter-pole voltage of a single valve group; represents the valve-side modulation wave voltage; represents the total number of sub-modules in a single bridge arm.

[0065] When the usage ratio of the IGCT sub-module is greater than or equal to the preset replacement ratio, based on the total number of sub-modules in a single bridge arm, the preset modulation sorting strategy, and the current number of sub-modules put into operation in the lower bridge arm, the real-time number of sub-modules put into operation in the lower bridge arm and the real-time number of sub-modules put into operation in the upper bridge arm are obtained; among them, the current number of sub-modules put into operation in the lower bridge arm can be understood as the number of sub-modules that have been put into operation in the lower bridge arm in the current topology relative to the moment t when the real-time number of sub-modules put into operation in the lower bridge arm needs to be updated (the real-time number of sub-modules put into operation in the lower bridge arm determined by analysis at time t - 1 ); The preset modulation sorting strategy can be understood as an adjustment modulation sorting strategy determined based on the modulation priority differences between the IGCT sub-module and the IGBT sub-module when the IGCT sub-module accounts for a relatively large proportion in the series-parallel converter valve topology; in practical applications, considering that the proportion of IGCT is relatively large, there will be two cases of different steady-state operating voltages involved in the specific modulation execution, and the preset modulation sorting strategy can be divided into 2 methods: 1) Sort the IGBT sub-module first, and then sort the IGCT sub-module; 2) Sort the IGCT sub-module first, and then sort the IGBT sub-module.

[0066] Specifically, when the preset modulation sorting strategy is to sort the IGBT sub-module first and then the IGCT sub-module, the IGBT sub-module is preferentially put into use. If the required input quantity exceeds the total number of IGBT sub-modules, the IGCT sub-module will be continued to be put into use; correspondingly, according to the total number of sub-modules in a single bridge arm, the preset modulation sorting strategy, and the number of sub-modules currently put into the lower bridge arm, the steps to obtain the number of sub-modules currently put into the lower bridge arm and the number of sub-modules currently put into the upper bridge arm include:

[0067] When the number of sub-modules currently put into the lower bridge arm is less than or equal to the number of IGBT sub-modules in a single bridge arm, based on the total number of sub-modules in a single bridge arm, the inter-pole voltage of a single valve group, the valve-side modulation wave voltage, and the rated operating voltage of the IGBT sub-module, the number of sub-modules currently put into the lower bridge arm and the number of sub-modules currently put into the upper bridge arm are calculated based on the first expression; that is, the number of sub-modules currently put into the lower bridge arm does not exceed the number of IGBT sub-modules in a single bridge arm ( ) When, based on the nearest level approximation modulation principle, the number of sub-modules currently put into the lower bridge arm at time t (putting in IGBT sub-modules) is expressed as:

[0068]

[0069] In the formula, represents sorting the IGBT sub-module first. When the number of sub-modules currently put into the lower bridge arm is less than or equal to the number of IGBT sub-modules in a single bridge arm, the number of sub-modules currently put into the lower bridge arm at time t; represents the rated operating voltage of the IGBT sub-module; represents the inter-pole voltage of a single valve group; represents the valve-side modulation wave voltage.

[0070] Based on the principle that the total number of the number of sub-modules currently put into the lower bridge arm and the number of sub-modules currently put into the upper bridge arm at any moment must be equal to the total number of sub-modules in a single bridge arm the number of sub-modules currently put into the upper bridge arm at time t (putting in IGBT sub-modules) is expressed as:

[0071]

[0072] In the formula, represents the total number of single-bridge-arm sub-modules; represents the sorted IGBT sub-modules. When the number of sub-modules currently put into the lower arm is less than or equal to the number of IGBT single-bridge-arm sub-modules, the number of sub-modules currently put into the lower arm and the number of sub-modules currently put into the upper arm at time t.

[0073] When the number of sub-modules currently put into the lower arm is greater than the number of IGBT single-bridge-arm sub-modules and the number of sub-modules currently put into the lower arm is less than the total number of single-bridge-arm sub-modules, according to the total number of single-bridge-arm sub-modules, the pole-to-pole voltage of the single valve group, the valve-side modulation wave voltage, the rated operating voltage of the IGBT sub-module, the number of IGBT single-bridge-arm sub-modules, and the rated operating voltage of the IGCT sub-module, the number of sub-modules currently put into the lower arm and the number of sub-modules currently put into the upper arm are calculated based on the second expression; where the second expression can be understood as when (the number of sub-modules currently put into the lower arm is already greater than the number of IGBT single-bridge-arm sub-modules), the expression for calculating the number of sub-modules currently put into the upper and lower arms at time t (putting in IGCT sub-modules) based on the nearest-level approximation modulation principle, which is expressed as:

[0074]

[0075] In the formula, and respectively represent that the usage ratio of the IGCT sub-module is greater than or equal to the preset replacement ratio. For the sorted IGBT sub-modules, when the number of sub-modules currently put into the lower arm is greater than the number of IGBT single-bridge-arm sub-modules, the number of sub-modules currently put into the lower arm and the number of sub-modules currently put into the upper arm at time t; represents the rated operating voltage of the IGCT sub-module; represents the number of IGBT single-bridge-arm sub-modules.

[0076] When the preset modulation sorting strategy is to sort the IGCT sub-modules first and then the IGBT sub-modules, the IGCT sub-modules are preferentially put into use. If the required input quantity exceeds the total amount of IGCT sub-modules, the IGBT sub-modules are then continued to be put in; correspondingly, according to the total number of single-bridge-arm sub-modules, the preset modulation sorting strategy, and the number of sub-modules currently put into the lower arm, the steps for obtaining the number of sub-modules currently put into the lower arm and the number of sub-modules currently put into the upper arm include:

[0077] When the number of sub - modules put into the current lower - bridge arm is less than or equal to the number of sub - modules of an IGCT single - bridge arm, based on the total number of single - bridge - arm sub - modules, the inter - pole voltage of a single valve group, the valve - side modulated - wave voltage, and the rated operating voltage of the IGCT sub - module, the real - time number of sub - modules put into the lower - bridge arm and the real - time number of sub - modules put into the upper - bridge arm are calculated based on the third expression; where the third expression can be understood as when (the number of sub - modules put into the current lower - bridge arm does not exceed the number of sub - modules of an IGCT single - bridge arm), the expression for calculating the real - time number of sub - modules put into the upper and lower bridge arms at time t (putting in IGCT sub - modules) based on the nearest - level - approximation modulation principle, is expressed as:

[0078]

[0079] In the formula, and respectively represent that the usage ratio of IGCT sub - modules is greater than or equal to the preset replacement ratio. First, sort the IGCT sub - modules. When the number of sub - modules put into the current lower - bridge arm is less than or equal to the number of sub - modules of an IGCT single - bridge arm, the real - time number of sub - modules put into the lower - bridge arm and the real - time number of sub - modules put into the upper - bridge arm at time t; respectively represent the rated operating voltage of the IGCT sub - module.

[0080] When the number of sub - modules put into the current lower - bridge arm is greater than the number of sub - modules of an IGCT single - bridge arm and the number of sub - modules put into the current lower - bridge arm is less than the total number of single - bridge - arm sub - modules, based on the total number of single - bridge - arm sub - modules, the inter - pole voltage of a single valve group, the valve - side modulated - wave voltage, the rated operating voltage of the IGBT sub - module, the number of sub - modules of an IGCT single - bridge arm, and the rated operating voltage of the IGCT sub - module, the real - time number of sub - modules put into the lower - bridge arm and the real - time number of sub - modules put into the upper - bridge arm are calculated based on the fourth expression; where the fourth expression can be understood as when (the number of sub - modules put into the current lower - bridge arm exceeds the number of sub - modules of an IGCT single - bridge arm), the expression for calculating the real - time number of sub - modules put into the upper and lower bridge arms at time t (putting in IGBT sub - modules) based on the nearest - level - approximation modulation principle, is expressed as:

[0081]

[0082] In the formula, and respectively represent that the usage ratio of IGCT sub - modules is greater than or equal to the preset replacement ratio. First, sort the IGCT sub - modules. When the number of sub - modules put into the current lower - bridge arm is greater than the number of sub - modules of an IGCT single - bridge arm, the real - time number of sub - modules put into the lower - bridge arm and the real - time number of sub - modules put into the upper - bridge arm at time t; represents the number of sub - modules of an IGCT single - bridge arm.

[0083] Through the above method steps, scientific and reasonable modulation control can be carried out on the IGBT sub-module and IGCT sub-module in the hybrid series-parallel converter valve topology based on the nearest level approximation modulation principle, providing a reliable guarantee for the stable operation of the hybrid series-parallel converter valve topology.

[0084] S12. Perform power transmission control according to the number of sub-modules actually put into the upper bridge arm and the number of sub-modules actually put into the lower bridge arm; among them, the power transmission control can be understood as being based on the calculated number of sub-modules that need to be put into the upper and lower bridge arms, and controlling the on-off of the sub-modules through trigger pulses to execute the corresponding voltage modulation strategy. Specifically, the implementation of power transmission control according to the number of sub-modules actually put into the upper bridge arm and the number of sub-modules actually put into the lower bridge arm can refer to the relevant existing technologies and will not be elaborated here.

[0085] In the embodiment of the present invention, a number of IGBT sub-modules and IGCT sub-modules are used in series, and a pseudo-bipolar structure is adopted as the main wiring design to obtain a hybrid series-parallel converter valve topology. According to the total number of sub-modules in a single bridge arm of the hybrid series-parallel converter valve topology and the usage ratio of IGCT sub-modules, based on the nearest level approximation modulation principle, the number of sub-modules actually put into the upper bridge arm and the number of sub-modules actually put into the lower bridge arm of the hybrid series-parallel converter valve topology are calculated, and a power transmission control scheme is executed according to the number of sub-modules actually put into the upper bridge arm and the number of sub-modules actually put into the lower bridge arm, effectively solving the application defects of the existing IGBT converter valve. Based on the configuration ratio of the IGBT sub-module and IGCT sub-module in the hybrid series-parallel converter valve topology and the nearest level approximation modulation principle, reliable and stable power transmission control is carried out on the hybrid series-parallel converter valve topology, and the advantages of insulated gate bipolar transistors and integrated gate-commutated thyristors can be complementary based on the flexible ratio of IGBT sub-modules and IGCT sub-modules. It can not only ensure the DC power transmission performance of the power transmission system, but also greatly reduce the construction cost of the flexible DC converter station, thereby effectively improving the economy of the flexible DC transmission technology in the large-scale new energy DC power transmission scenario.

[0086] In order to verify the effectiveness of the power transmission control method of the hybrid series-parallel converter valve topology proposed by the present invention, in this embodiment, a flexible DC power transmission system of the hybrid series-parallel converter valve topology is also built based on the PSCAD (Power System Computer Aided Design) model for flexible DC transient and steady-state characteristic verification. Among them, the DC bus voltage is 520 kV, the number of modules in a single bridge arm is 234 (IGBT, 2.2 kV) + 4 (IGCT, 3.1 kV), and the single bridge arm sub-modules numbered 1-4 are set as IGCT modules, and the single bridge arm sub-modules numbered 5-238 are set as IGBT modules, obtaining Figures 3 - 6 the verification results shown. Based on Figure 3From the steady-state waveforms of the hybrid series-parallel converter valve topology in the flexible DC transmission system shown, the steady-state waveforms of the hybrid series-parallel converter valve are stable, indicating that the hybrid mode is feasible; based on Figure 4 From the operating waveforms of the hybrid series-parallel converter valve topology obtained by simulating an AC three-phase ground fault with a duration of 100 ms as shown, after the fault is cleared, the DC power and DC current of the flexible DC system are restored, and the transient characteristics meet the expectations; based on Figure 5 From the operating waveforms of the hybrid series-parallel converter valve topology obtained by simulating a valve-side three-phase ground fault with a duration of 100 ms as shown, after the fault, the flexible DC system experiences overcurrent and DC blocking, and the transient characteristics meet the expectations; based on Figure 6 From the operating waveforms of the hybrid series-parallel converter valve topology obtained by simulating a DC positive pole ground fault with a duration of 100 ms as shown, the flexible DC system experiences overcurrent and DC blocking, and the transient characteristics meet the expectations; in addition, by comparing Figures 4 - 6 it can be seen that the overall trends of the changes in IGBT sub-modules and IGCT sub-modules under different fault conditions are consistent, with good stability.

[0087] It should be noted that although the steps in the above flowcharts are displayed in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders.

[0088] In one embodiment, as Figure 7 shown, a power transmission control system for a hybrid series-parallel converter valve topology is provided. The hybrid series-parallel converter valve topology includes a number of IGBT sub-modules and IGCT sub-modules used in series; the main wiring of the hybrid series-parallel converter valve topology adopts a pseudo-bipolar structure; the system includes:

[0089] A sub-module input analysis module 1, configured to calculate the real-time number of sub-modules input to the upper bridge arm and the real-time number of sub-modules input to the lower bridge arm of the hybrid series-parallel converter valve topology based on the total number of sub-modules in a single bridge arm of the hybrid series-parallel converter valve topology and the usage ratio of IGCT sub-modules according to the nearest level approximation modulation principle;

[0090] A power transmission control module 2, configured to perform power transmission control according to the real-time number of sub-modules input to the upper bridge arm and the real-time number of sub-modules input to the lower bridge arm.

[0091] For the specific limitations of the power transmission control system of the hybrid series-parallel converter valve topology, reference can be made to the limitations of the power transmission control method of the hybrid series-parallel converter valve topology in the above text, and the corresponding technical effects can also be equivalently obtained, which will not be elaborated here. Each module in the above power transmission control system of the hybrid series-parallel converter valve topology can be implemented in whole or in part by software, hardware, and their combination. Each of the above modules can be embedded in the processor in the computer device in hardware form or independent of it, or stored in the memory in the computer device in software form, so that the processor can call and execute the operations corresponding to each of the above modules.

[0092] Figure 8 FIG. shows the internal structure diagram of a computer device in an embodiment. The computer device can specifically be a terminal or a server. As Figure 8 shown, the computer device includes a processor, a memory, a network interface, a display, a camera, and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. The computer program, when executed by the processor, implements the power transmission control method of the hybrid series-parallel converter valve topology. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer covered on the display screen, or a button, a trackball, or a touchpad provided on the housing of the computer device, or an external keyboard, a touchpad, or a mouse, etc.

[0093] Those of ordinary skill in the art can understand that Figure 8 the structure shown in

[0094] is only a block diagram of some structures related to the solution of the present invention, and does not constitute a limitation on the computer device to which the solution of the present invention is applied. The specific computing device may include more or fewer components than those shown in the figure, or combine some components, or have the same component arrangement.

[0095] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps of the above method are implemented.

[0096] In summary, the power transmission control method and system for a hybrid series-parallel converter valve topology provided by the embodiments of the present invention realize the series use of a plurality of IGBT sub-modules and IGCT sub-modules, and adopt a pseudo-bipolar structure as the main wiring design to obtain the hybrid series-parallel converter valve topology. According to the total number of sub-modules in a single bridge arm of the hybrid series-parallel converter valve topology and the usage ratio of IGCT sub-modules, based on the principle of nearest level approximation modulation, the real-time number of sub-modules put into use in the upper bridge arm and the real-time number of sub-modules put into use in the lower bridge arm of the hybrid series-parallel converter valve topology are calculated, and power transmission control is executed according to the real-time number of sub-modules put into use in the upper bridge arm and the real-time number of sub-modules put into use in the lower bridge arm. This method can achieve the complementary advantages of insulated gate bipolar transistors and integrated gate-commutated thyristors based on the flexible ratio of IGBT sub-modules and IGCT sub-modules, not only ensuring the DC power transmission performance of the power transmission system, but also greatly reducing the construction cost of the flexible DC converter station, and thus effectively improving the economy of the flexible DC transmission technology in large-scale new energy DC power transmission scenarios.

[0097] The embodiments in this specification are all described in a progressive manner. For parts that are the same or similar in each embodiment, they can be referred to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. It should be noted that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0098] The above-described embodiments only represent several preferred embodiments of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and substitutions can still be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the protection scope of the claims.

Claims

1. A power transmission control method for a hybrid converter valve topology, characterized in that: The hybrid converter valve topology includes a plurality of IGBT submodules and IGCT submodules connected in series; the main connection of the hybrid converter valve topology adopts a pseudo-bipolar structure; the method includes the following steps: According to the total number of single-bridge-arm submodules and the usage ratio of IGCT submodules in the hybrid converter valve topology, the number of upper-bridge-arm real-time input submodules and the number of lower-bridge-arm real-time input submodules in the hybrid converter valve topology are calculated based on the nearest level approximation modulation principle, including: When the usage ratio of the IGCT submodule is less than the preset replacement ratio, the number of the lower bridge arm real-time put-in-place submodules and the number of the upper bridge arm real-time put-in-place submodules are calculated based on the first expression according to the total number of the single bridge arm submodules, the inter-electrode voltage of the single valve group, the valve-side modulation wave voltage and the rated working voltage of the IGBT submodule; the first expression is expressed as: In the formula, and They respectively represent the number of sub-modules put into use in the lower bridge arm and the number of sub-modules put into use in the upper bridge arm at time t when the usage ratio of the IGCT sub-modules is less than the preset replacement ratio; Indicates the rated operating voltage of the IGBT submodule; Indicates the inter-electrode voltage of a single valve group; Indicates the valve side modulation wave voltage; Indicates the total number of single bridge arm submodules; When the usage ratio of the IGCT submodule is greater than or equal to the preset replacement ratio, the number of the lower bridge arm real-time input submodules and the number of the upper bridge arm real-time input submodules are obtained according to the total number of the single bridge arm submodules, the preset modulation sorting strategy and the current number of lower bridge arm input submodules; Power transmission control is performed according to the number of submodules put into operation in real time in the upper bridge arm and the number of submodules put into operation in real time in the lower bridge arm.

2. The power transmission control method of the hybrid converter valve topology according to claim 1, characterized in that: The total number of single-arm submodules in the hybrid converter valve topology is calculated based on the target flexible DC output voltage, the voltage of a single submodule and Kirchhoff's voltage law.

3. The power transmission control method of the hybrid converter valve topology according to claim 2, characterized in that: The number of IGBT single-bridge arm submodules and the number of IGCT single-bridge arm submodules in the hybrid converter valve topology are determined by the following steps: When the usage ratio of the IGCT submodule is less than the preset replacement ratio, the number of the IGCT single bridge arm submodules is obtained based on the product of the total number of the single bridge arm submodules and the usage ratio of the IGCT submodules, and the number of the IGBT single bridge arm submodules is obtained according to the difference between the total number of the single bridge arm submodules and the number of the IGCT single bridge arm submodules; When the usage ratio of the IGCT sub-module is greater than or equal to the preset replacement ratio, the number of the IGBT single bridge arm sub-modules and the number of the IGCT single bridge arm sub-modules are calculated based on the single valve group inter-pole voltage constraint according to the total number of the single bridge arm sub-modules, the rated operating voltage of the IGBT sub-modules and the rated operating voltage of the IGCT sub-modules.

4. The power transmission control method of the hybrid converter valve topology according to claim 3, characterized in that: The inter-electrode voltage constraint of the single valve group is expressed as: In the formula, and Respectively represent the number of IGBT single bridge arm submodules and the number of IGCT single bridge arm submodules; and Respectively represent the rated operating voltages of the IGBT submodule and the IGCT submodule; Indicates the inter-electrode voltage of a single valve group.

5. The power transmission control method of the hybrid converter valve topology according to claim 1, characterized in that: When the preset modulation sorting strategy is to sort the IGBT submodules first and then sort the IGCT submodules, the step of obtaining the number of lower bridge arm real-time put-in-place submodules and the number of upper bridge arm real-time put-in-place submodules according to the total number of single bridge arm submodules, the preset modulation sorting strategy and the current number of lower bridge arm put-in-place submodules includes: When the current number of lower bridge arm submodules is less than or equal to the number of IGBT single bridge arm submodules, the number of lower bridge arm real-time submodules and the number of upper bridge arm real-time submodules are calculated based on the first expression according to the total number of single bridge arm submodules, the single valve group inter-electrode voltage, the valve side modulation wave voltage and the rated working voltage of the IGBT submodule; When the current number of lower bridge arm submodules put into operation is greater than the number of IGBT single bridge arm submodules and the current number of lower bridge arm submodules put into operation is less than the total number of single bridge arm submodules, the number of lower bridge arm real-time submodules put into operation and the number of upper bridge arm real-time submodules put into operation are calculated based on the second expression according to the total number of single bridge arm submodules, the inter-electrode voltage of the single valve group, the valve-side modulation wave voltage, the rated operating voltage of the IGBT submodule, the number of IGBT single bridge arm submodules and the rated operating voltage of the IGCT submodule; the second expression is expressed as: In the formula, and They respectively indicate that the usage ratio of IGCT submodules is greater than or equal to the preset replacement ratio, and the IGBT submodules are sorted first. When the number of submodules put into use in the lower bridge arm is greater than the number of IGBT single bridge arm submodules, the number of submodules put into use in the lower bridge arm and the number of submodules put into use in the upper bridge arm at time t; Indicates the rated operating voltage of the IGCT submodule; Indicates the number of IGBT single bridge arm sub-modules.

6. The power transmission control method of the hybrid converter valve topology according to claim 1, characterized in that: When the preset modulation sorting strategy is to sort the IGCT submodules first and then sort the IGBT submodules, the step of obtaining the number of lower bridge arm real-time put-in-place submodules and the number of upper bridge arm real-time put-in-place submodules according to the total number of single bridge arm submodules, the preset modulation sorting strategy and the current number of lower bridge arm put-in-place submodules includes: When the current number of lower bridge arm submodules is less than or equal to the number of IGCT single bridge arm submodules, the number of lower bridge arm real-time submodules and the number of upper bridge arm real-time submodules are calculated based on the third expression according to the total number of single bridge arm submodules, the single valve group inter-electrode voltage, the valve-side modulation wave voltage and the rated working voltage of the IGCT submodule; the third expression is expressed as: In the formula, and They respectively indicate that the usage ratio of IGCT submodules is greater than or equal to the preset replacement ratio. The IGCT submodules are sorted first. When the number of submodules put into use in the lower bridge arm is less than or equal to the number of submodules in the IGCT single bridge arm, the number of submodules put into use in the lower bridge arm and the number of submodules put into use in the upper bridge arm at time t are real-time; Respectively represent the rated operating voltage of the IGCT submodule; When the current number of lower bridge arm submodules put into operation is greater than the number of IGCT single bridge arm submodules and the current number of lower bridge arm submodules put into operation is less than the total number of single bridge arm submodules, the number of lower bridge arm real-time submodules put into operation and the number of upper bridge arm real-time submodules put into operation are calculated based on the fourth expression according to the total number of single bridge arm submodules, the single valve group inter-electrode voltage, the valve-side modulation wave voltage, the rated operating voltage of the IGBT submodule, the number of IGCT single bridge arm submodules and the rated operating voltage of the IGCT submodule; the fourth expression is expressed as: In the formula, and They respectively indicate that the usage ratio of IGCT submodules is greater than or equal to the preset replacement ratio. The IGCT submodules are sorted first. When the number of submodules put into use in the lower bridge arm is greater than the number of submodules in the IGCT single bridge arm, the number of submodules put into use in the lower bridge arm and the number of submodules put into use in the upper bridge arm at time t are real-time; Indicates the number of IGCT single bridge arm submodules.

7. A power transmission control system with a hybrid converter valve topology, characterized in that: The power transmission control method of the hybrid converter valve topology according to claim 1 is applied, wherein the hybrid converter valve topology includes a plurality of IGBT submodules and IGCT submodules connected in series; the main connection of the hybrid converter valve topology adopts a pseudo-bipolar structure; the system includes: A submodule input analysis module is used to calculate the number of real-time input submodules of the upper bridge arm and the number of real-time input submodules of the lower bridge arm in the hybrid converter valve topology based on the nearest level approximation modulation principle according to the total number of single bridge arm submodules and the usage ratio of IGCT submodules in the hybrid converter valve topology; The power transmission control module is used to perform power transmission control according to the number of sub-modules put into operation in real time in the upper bridge arm and the number of sub-modules put into operation in real time in the lower bridge arm.

8. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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