Bridge arm sub-module switching method and device, storage medium and electronic equipment

Abstract

The invention discloses a bridge arm sub-module switching method and device, a storage medium and electronic equipment, and relates to the technical field of medium and low voltage flexible interconnection. The method comprises the following steps: obtaining the number of available sub-modules of an upper bridge arm and the number of available sub-modules of a lower bridge arm; obtaining the number of sub-modules required by an upper bridge arm and the number of sub-modules required by a lower bridge arm; and based on the number of available sub-modules of the upper bridge arm, the number of available sub-modules of the lower bridge arm, the number of sub-modules required by the upper bridge arm and the number of sub-modules required by the lower bridge arm, performing switching control on the sub-modules of the converter in the flexible interconnection system by combining a first switch, a second switch, a third switch and a fourth switch in the flexible interconnection system. According to the invention, the problem of low stability of the flexible interconnection system caused by poor switching control effect of the bridge arm sub-module of the converter in the flexible interconnection system in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the technical field of medium and low voltage flexible interconnection, and in particular to a switching method and device for a bridge arm submodule, a storage medium and an electronic device. Background Art

[0002] At present, the existing distribution network is facing the customization and diversification of electricity demand. In the face of the disorder of distributed energy, distributed energy storage and electric vehicles with high penetration ratio, higher requirements are put forward for the means of ensuring the power quality and power supply reliability of medium and low voltage intelligent distribution networks. These problems are difficult to effectively solve using conventional switches. The new energy distribution network is interconnected through medium voltage flexibility, but the cost of using MMC flexible interconnection intelligent switches (a new type of intelligent electrical equipment with flexible interconnection function, which can realize intelligent monitoring and control of the power system) is high. In order to reduce the cost, a bridge arm multiplexing converter can be used. However, it is difficult to realize the automatic switching of the medium voltage flexible interconnection multiplexing bridge arm submodule in the related technology, and human intervention is required when the bridge arm submodule of the converter in the flexible interconnection system is switched, so the effect of switching the bridge arm submodule of the converter in the flexible interconnection system is poor, which leads to the low stability of the flexible interconnection system, and it is difficult to ensure the safe and stable operation of the new energy distribution network. In addition, the above-mentioned bridge arm submodule can include a submodule of the upper bridge arm, a submodule of the multiplexing bridge arm and a submodule of the lower bridge arm.

[0003] With regard to the problem in the related art that the switching control effect of the bridge arm submodule of the converter in the flexible interconnection system is poor, resulting in low stability of the flexible interconnection system, no effective solution has been proposed yet. Summary of the invention

[0004] The main purpose of the present application is to provide a switching method and device for a bridge arm submodule, a storage medium and an electronic device, so as to solve the problem in the related art that the switching control effect of the bridge arm submodule of the converter in the flexible interconnection system is poor, resulting in low stability of the flexible interconnection system.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a method for switching a bridge arm submodule is provided. The method comprises: obtaining the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm, wherein the upper bridge arm and the lower bridge arm are bridge arms of a converter in a flexible interconnection system, and the flexible interconnection system is used to control a power distribution network; obtaining the number of submodules required by the upper bridge arm and the number of submodules required by the lower bridge arm; based on the number of submodules available in the upper bridge arm, the number of submodules available in the lower bridge arm, the number of submodules required by the upper bridge arm, and the number of submodules required by the lower bridge arm, in combination with the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system, switching control is performed on the submodules of the converter in the flexible interconnection system, wherein the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system are used to control the switching of the submodules of the upper bridge arm, the reused bridge arm, and the lower bridge arm, and the reused bridge arm is the bridge arm of the converter in the flexible interconnection system.

[0006] Further, based on the number of submodules available in the upper bridge arm, the number of submodules available in the lower bridge arm, the number of submodules required for the upper bridge arm, and the number of submodules required for the lower bridge arm, in combination with the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system, the switching control of the submodules of the converter in the flexible interconnection system includes: judging whether the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than a first preset value; if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then according to the number of submodules required for the upper bridge arm or the number of submodules required for the lower bridge arm, the switching control of the submodules of the converter in the flexible interconnection system is performed. The number of submodules required for the lower bridge arm is combined with the first switch or the second switch in the flexible interconnection system to control the switching of the submodules of the converter in the flexible interconnection system; if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are both less than the first preset value, it is determined whether the number of submodules available in the upper bridge arm or the number of submodules available in the lower bridge arm is greater than the second preset value, and a judgment result is obtained, wherein the first preset value is greater than the second preset value; based on the judgment result, combined with the third switch or the fourth switch in the flexible interconnection system, the switching of the submodules of the converter in the flexible interconnection system is controlled.

[0007] Further, if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then according to the number of submodules required by the upper bridge arm or the number of submodules required by the lower bridge arm, combined with the first switch or the second switch in the flexible interconnection system, the switching control of the submodules of the converter in the flexible interconnection system includes: if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then judging whether the number of submodules required by the lower bridge arm is not less than the first preset value; if the number of submodules required by the lower bridge arm is not less than the first preset value, closing the first switch in the flexible interconnection system, and controlling the submodules of the reused bridge arm to participate in the switching of the submodules of the lower bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; if the number of submodules required by the lower bridge arm is less than the first preset value, prohibiting the switching control of the submodules of the converter in the flexible interconnection system.

[0008] Furthermore, if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then according to the number of submodules required by the upper bridge arm or the number of submodules required by the lower bridge arm, combined with the first switch or the second switch in the flexible interconnection system, the switching control of the submodules of the converter in the flexible interconnection system includes: if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then judging whether the number of submodules required by the upper bridge arm is not less than the first preset value; if the number of submodules required by the upper bridge arm is not less than the first preset value, closing the second switch in the flexible interconnection system, and controlling the submodules of the reused bridge arm to participate in the switching of the submodules of the upper bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; if the number of submodules required by the upper bridge arm is less than the first preset value, prohibiting the switching control of the submodules of the converter in the flexible interconnection system.

[0009] Further, according to the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, the switching control of the submodules of the converter in the flexible interconnection system includes: if the judgment result indicates that the number of submodules available in the upper bridge arm is greater than the second preset value, then judging whether the number of submodules required by the lower bridge arm is not less than the first preset value; if the number of submodules required by the lower bridge arm is not less than the first preset value, closing the third switch in the flexible interconnection system, and controlling the target submodule and the first redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the lower bridge arm, and controlling the second redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the upper bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; if the number of submodules required by the lower bridge arm is less than the first preset value, prohibiting the switching control of the submodules of the converter in the flexible interconnection system.

[0010] Further, according to the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, the switching control of the submodules of the converter in the flexible interconnection system includes: if the judgment result indicates that the number of submodules available in the lower bridge arm is greater than the second preset value, then judging whether the number of submodules required by the upper bridge arm is not less than the first preset value; if the number of submodules required by the upper bridge arm is not less than the first preset value, closing the fourth switch in the flexible interconnection system, and controlling the target submodule and the first redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the upper bridge arm, and controlling the second redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the lower bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; if the number of submodules required by the upper bridge arm is less than the first preset value, prohibiting the switching control of the submodules of the converter in the flexible interconnection system.

[0011] Further, based on the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, the switching control of the submodules of the converter in the flexible interconnection system includes: if the judgment result indicates that the number of submodules available in the upper bridge arm or the number of submodules available in the lower bridge arm is not greater than the second preset value, the flexible interconnection system is controlled to be in a locked state, and the switching control of the submodules of the converter in the flexible interconnection system is prohibited.

[0012] In order to achieve the above-mentioned purpose, according to another aspect of the present application, a switching device for a bridge arm submodule is provided. The device comprises: a first acquisition unit, used to acquire the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm, wherein the upper bridge arm and the lower bridge arm are bridge arms of a converter in a flexible interconnection system, and the flexible interconnection system is used to control a power distribution network; a second acquisition unit, used to acquire the number of submodules required by the upper bridge arm and the number of submodules required by the lower bridge arm; a first control unit, used to control the switching of the submodules of the converter in the flexible interconnection system based on the number of submodules available in the upper bridge arm, the number of submodules available in the lower bridge arm, the number of submodules required by the upper bridge arm, and the number of submodules required by the lower bridge arm, in combination with the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system, wherein the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system are used to control the switching of the submodules of the upper bridge arm, the reused bridge arm, and the lower bridge arm, and the reused bridge arm is the bridge arm of the converter in the flexible interconnection system.

[0013] Further, the first control unit includes: a first judgment module, used to judge whether the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than a first preset value; a first control module, used to, if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then according to the number of submodules required by the upper bridge arm or the number of submodules required by the lower bridge arm, combined with the first switch or the second switch in the flexible interconnection system, control the switching of the submodules of the converter in the flexible interconnection system; a second judgment module, used to, if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are both less than the first preset value, judge whether the number of submodules available in the upper bridge arm or the number of submodules available in the lower bridge arm is greater than a second preset value, and obtain a judgment result, wherein the first preset value is greater than the second preset value; a second control module, used to, based on the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, control the switching of the submodules of the converter in the flexible interconnection system.

[0014] Furthermore, the first control module includes: a first judgment submodule, used to judge whether the number of submodules required by the lower bridge arm is not less than the first preset value if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value; a first processing submodule, used to close the first switch in the flexible interconnection system and control the submodules of the multiplexed bridge arm to participate in the switching of the submodules of the lower bridge arm to complete the switching control of the submodules of the converter in the flexible interconnection system if the number of submodules required by the lower bridge arm is not less than the first preset value; and a second processing submodule, used to prohibit the switching control of the submodules of the converter in the flexible interconnection system if the number of submodules required by the lower bridge arm is less than the first preset value.

[0015] Furthermore, the first control module includes: a second judgment submodule, used to judge whether the number of submodules required by the upper bridge arm is not less than the first preset value if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value; a third processing submodule, used to close the second switch in the flexible interconnection system if the number of submodules required by the upper bridge arm is not less than the first preset value, and control the submodules of the multiplexed bridge arm to participate in the switching of the submodules of the upper bridge arm to complete the switching control of the submodules of the converter in the flexible interconnection system; a fourth processing submodule, used to prohibit the switching control of the submodules of the converter in the flexible interconnection system if the number of submodules required by the upper bridge arm is less than the first preset value.

[0016] Furthermore, the second control module includes: a third judgment submodule, which is used to judge whether the number of submodules required by the lower bridge arm is not less than the first preset value if the judgment result indicates that the number of submodules available in the upper bridge arm is greater than the second preset value; a fifth processing submodule, which is used to close the third switch in the flexible interconnection system if the number of submodules required by the lower bridge arm is not less than the first preset value, and control the target submodule and the first redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the lower bridge arm, and control the second redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the upper bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; and a sixth processing submodule, which is used to prohibit the switching control of the submodules of the converter in the flexible interconnection system if the number of submodules required by the lower bridge arm is less than the first preset value.

[0017] Furthermore, the second control module includes: a fourth judgment submodule, which is used to judge whether the number of submodules required by the upper bridge arm is not less than the first preset value if the judgment result indicates that the number of submodules available in the lower bridge arm is greater than the second preset value; a seventh processing submodule, which is used to close the fourth switch in the flexible interconnection system if the number of submodules required by the upper bridge arm is not less than the first preset value, and control the target submodule and the first redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the upper bridge arm, and control the second redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the lower bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; an eighth processing submodule, which is used to prohibit the switching control of the submodules of the converter in the flexible interconnection system if the number of submodules required by the upper bridge arm is less than the first preset value.

[0018] Furthermore, the second control module includes: a ninth processing submodule, which is used to control the flexible interconnection system to be in a locked state and prohibit switching control of the submodules of the converter in the flexible interconnection system if the judgment result indicates that the number of submodules available in the upper bridge arm or the number of submodules available in the lower bridge arm is not greater than the second preset value.

[0019] In order to achieve the above-mentioned object, according to another aspect of the present application, a computer-readable storage medium is provided, wherein the storage medium stores a program, wherein the program executes any one of the above-mentioned methods for switching on and off the bridge arm submodules.

[0020] In order to achieve the above-mentioned purpose, according to another aspect of the present application, an electronic device is provided, which includes one or more processors and a memory, and the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement any one of the above-mentioned methods for switching on and off the bridge arm sub-modules.

[0021] Through the present application, the following steps are adopted: obtaining the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm, wherein the upper bridge arm and the lower bridge arm are bridge arms of the converter in the flexible interconnection system, and the flexible interconnection system is used to control the power distribution network; obtaining the number of submodules required for the upper bridge arm and the number of submodules required for the lower bridge arm; based on the number of submodules available in the upper bridge arm, the number of submodules available in the lower bridge arm, the number of submodules required for the upper bridge arm, and the number of submodules required for the lower bridge arm, combined with the first switch, the second switch, the third switch and the fourth switch in the flexible interconnection system, the submodules of the converter in the flexible interconnection system are switched on and off, wherein the first switch, the second switch, the third switch and the fourth switch in the flexible interconnection system are used to control the switching of the submodules of the upper bridge arm, the reused bridge arm and the lower bridge arm, and the reused bridge arm is the bridge arm of the converter in the flexible interconnection system, which solves the problem that the switching control effect of the bridge arm submodules of the converter in the flexible interconnection system in the related art is poor, resulting in low stability of the flexible interconnection system. By obtaining the number of sub-modules available in the upper bridge arm and the number of sub-modules available in the lower bridge arm of the converter in the flexible interconnection system, and obtaining the number of sub-modules required for the upper bridge arm and the number of sub-modules required for the lower bridge arm, and then according to the number of sub-modules available in the upper bridge arm, the number of sub-modules available in the lower bridge arm, the number of sub-modules required for the upper bridge arm and the number of sub-modules required for the lower bridge arm, and by using the first switch, the second switch, the third switch and the fourth switch in the flexible interconnection system, the sub-modules of the converter in the flexible interconnection system are switched on and off, thereby realizing automatic switching of the medium-voltage flexible interconnection multiplexed bridge arm sub-modules, while reducing human intervention operations, thereby achieving the effect of ensuring the safe and stable operation of the new energy distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 The process of the switching method of the bridge arm submodule provided in the embodiment of the present application is as follows Figure 1 ;

[0024] Figure 2 is a schematic diagram of a medium-voltage flexible interconnection system of a bridge arm multiplexing type flexible converter in this embodiment;

[0025] Figure 3 The process of the switching method of the bridge arm submodule provided in the embodiment of the present application is as follows Figure 2 ;

[0026] Figure 4 is a schematic diagram of a switching device of a bridge arm submodule provided according to an embodiment of the present application;

[0027] Figure 5 is a schematic diagram of an electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] It should be noted that the relevant information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for display, data for analysis, etc.) involved in this disclosure are all information and data authorized by the user or fully authorized by all parties. For example, an interface is set between this system and the relevant user or organization. Before obtaining relevant information, it is necessary to send an acquisition request to the aforementioned user or organization through the interface, and obtain relevant information after receiving the consent information fed back by the aforementioned user or organization.

[0032] The present invention is described below in conjunction with preferred implementation steps. Figure 1 The process of the switching method of the bridge arm submodule provided in the embodiment of the present application is as follows Figure 1 ,like Figure 1 As shown, the method comprises the following steps:

[0033] Step S101, obtaining the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm, wherein the upper bridge arm and the lower bridge arm are bridge arms of a converter in a flexible interconnection system, and the flexible interconnection system is used to control a power distribution network.

[0034] For example, Figure 2 is a schematic diagram of a medium voltage flexible interconnection system of a bridge arm multiplexing flexible converter in this embodiment, such as Figure 2 As shown, the medium voltage flexible interconnection system uses a double-end or multi-end bridge arm multiplexing flexible converter to connect two or more medium voltage smart grids. Each flexible converter contains at least 6 multiplexing bridge arms, each multiplexing bridge arm consists of three parts: an upper bridge arm, a multiplexing bridge arm and a lower bridge arm. The upper bridge arm and the lower bridge arm are composed of N / 2 (must be configured) and m (redundant configuration) sub-modules, and the multiplexing bridge arm is composed of N / 2 (must be configured) and 2m (redundant configuration) sub-modules. In addition, the multiplexing bridge arm is connected to the AC power grid startup circuit through 5 switching switches. Switches Q1, Q3, Q4 and Q5 are used for switching the upper bridge arm, multiplexing bridge arm and lower bridge arm modules during normal operation. Switch Q2 is used to evenly divide the multiplexing bridge arm sub-modules when the system starts, so that the multiplexing bridge arm sub-modules participate in the switching of the upper bridge arm and lower bridge arm sub-modules at the same time.

[0035] For example, the converter control system can detect in real time the number of submodules that can be put into use in the upper bridge arm and the lower bridge arm (corresponding to the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm mentioned above).

[0036] Step S102, obtaining the number of submodules required for the upper bridge arm and the number of submodules required for the lower bridge arm.

[0037] For example, the converter control system can detect in real time the number of submodules required for the upper bridge arm and the lower bridge arm according to the modulation wave (corresponding to the number of submodules required for the upper bridge arm and the number of submodules required for the lower bridge arm mentioned above).

[0038] Step S103, based on the number of sub-modules available in the upper bridge arm, the number of sub-modules available in the lower bridge arm, the number of sub-modules required in the upper bridge arm, and the number of sub-modules required in the lower bridge arm, combined with the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system, the sub-modules of the converter in the flexible interconnection system are controlled to be switched on and off, wherein the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system are used to control the switching of the sub-modules of the upper bridge arm, the multiplexed bridge arm, and the lower bridge arm, and the multiplexed bridge arm is the bridge arm of the converter in the flexible interconnection system.

[0039] For example, the number of submodules that can be put into the upper bridge arm and the lower bridge arm (corresponding to the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm) and the number of submodules required to be put into the upper bridge arm and the lower bridge arm (corresponding to the number of submodules required for the upper bridge arm and the number of submodules required for the lower bridge arm) detected can be used, and the first switch in the flexible interconnection system (corresponding to Figure 2 The switching switch Q1 in the Figure 2 The switching switch Q3 in the Figure 2 The switching switch Q4 in the Figure 2 The switching switch Q5 in the flexible interconnection system controls the switching of the submodules of the converter in the flexible interconnection system. Moreover, the switching control of the submodules refers to turning on or off the submodules of the converter in the flexible interconnection system.

[0040] Through the above steps S101 to S103, by obtaining the number of sub-modules available in the upper bridge arm and the number of sub-modules available in the lower bridge arm of the converter in the flexible interconnection system, and obtaining the number of sub-modules required for the upper bridge arm and the number of sub-modules required for the lower bridge arm, then according to the number of sub-modules available in the upper bridge arm, the number of sub-modules available in the lower bridge arm, the number of sub-modules required for the upper bridge arm and the number of sub-modules required for the lower bridge arm, and by using the first switch, the second switch, the third switch and the fourth switch in the flexible interconnection system, the sub-modules of the converter in the flexible interconnection system are switched on and off, thereby realizing automatic switching of the medium-voltage flexible interconnection multiplexed bridge arm sub-modules, while reducing human intervention operations, thereby achieving the effect of ensuring the safe and stable operation of the new energy distribution network.

[0041] Optionally, in the switching method of the bridge arm submodule provided in the embodiment of the present application, based on the number of submodules available in the upper bridge arm, the number of submodules available in the lower bridge arm, the number of submodules required in the upper bridge arm, and the number of submodules required in the lower bridge arm, in combination with the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system, the switching control of the submodules of the converter in the flexible interconnection system includes: judging whether the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are both not less than a first preset value; if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are both not less than the first preset value, then according to the upper bridge arm, The number of submodules required for the upper bridge arm or the number of submodules required for the lower bridge arm, combined with the first switch or the second switch in the flexible interconnection system, the switching control of the submodules of the converter in the flexible interconnection system is performed; if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are both less than the first preset value, it is determined whether the number of submodules available in the upper bridge arm or the number of submodules available in the lower bridge arm is greater than the second preset value, and a judgment result is obtained, wherein the first preset value is greater than the second preset value; according to the judgment result, combined with the third switch or the fourth switch in the flexible interconnection system, the switching control of the submodules of the converter in the flexible interconnection system is performed.

[0042] For example, the converter control system detects in real time the number of submodules that can be put into the upper bridge arm and the lower bridge arm (corresponding to the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm mentioned above). When the number of submodules that can be put into the upper bridge arm and the lower bridge arm (corresponding to the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm mentioned above) is greater than or equal to N / 2 (corresponding to the first preset value mentioned above), the first switch in the flexible interconnection system (corresponding to Figure 2 The switching switch Q1 in the Figure 2 The switching switch Q3 in the flexible interconnection system controls the switching of the submodules of the converter in the flexible interconnection system; when the number of submodules that can be put into the upper bridge arm and the lower bridge arm (corresponding to the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm) is less than N / 2 (corresponding to the first preset value above), it can be determined whether the number of submodules that can be put into the upper bridge arm or the lower bridge arm (corresponding to the number of submodules available in the upper bridge arm or the number of submodules available in the lower bridge arm) is greater than N / 2-m (corresponding to the second preset value above); and according to the judgment result, the third switch (corresponding to Figure 2 The switching switch Q4 in the Figure 2 The switching switch Q5) in the flexible interconnection system controls the switching of the sub-modules of the converter.

[0043] Through the above solution, according to the number of sub-modules that can be put into use in the upper bridge arm and the lower bridge arm, the switching control of the sub-modules of the converter in the flexible interconnection system can be carried out quickly and accurately.

[0044] Optionally, in the switching method of the bridge arm submodule provided in an embodiment of the present application, if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than a first preset value, then based on the number of submodules required by the upper bridge arm or the number of submodules required by the lower bridge arm, combined with the first switch or the second switch in the flexible interconnection system, the switching control of the submodules of the converter in the flexible interconnection system includes: if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then judging whether the number of submodules required by the lower bridge arm is not less than the first preset value; if the number of submodules required by the lower bridge arm is not less than the first preset value, closing the first switch in the flexible interconnection system, and controlling the submodules of the multiplexed bridge arm to participate in the switching of the submodules of the lower bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; if the number of submodules required by the lower bridge arm is less than the first preset value, prohibiting the switching control of the submodules of the converter in the flexible interconnection system.

[0045] For example, when the number of submodules that can be put into use in the upper bridge arm and the lower bridge arm (corresponding to the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm) is greater than or equal to N / 2 (corresponding to the first preset value mentioned above), it can be determined whether the number of submodules required to be put into use in the lower bridge arm (corresponding to the number of submodules required for the lower bridge arm) is greater than or equal to N / 2 (corresponding to the first preset value mentioned above); if the number of submodules required to be put into use in the lower bridge arm (corresponding to the number of submodules required for the lower bridge arm) is greater than or equal to N / 2 (corresponding to the first preset value mentioned above), the converter control system sends a closed switching switch Q1 (corresponding to the first switch mentioned above) to close the multiplexing bridge arm and the lower bridge arm. The arms cooperate to enter the submodule switching sequence, the N / 2 submodules of the lower bridge arm and the redundant m submodules are switched in sequence to perform dynamic voltage balancing; the reused bridge arm submodule increases the number of modules required by the converter control system module, the N / 2 submodules of the reused bridge arm submodule and the redundant 2m submodules are switched in sequence, the submodule voltage higher than the threshold is exited first, and the submodule voltage lower than the threshold is switched in first to maintain the submodule voltage; if the number of submodules required to be put into the lower bridge arm (corresponding to the number of submodules required by the lower bridge arm mentioned above) is less than N / 2 (corresponding to the first preset value mentioned above), the switching control of the submodules of the converter in the flexible interconnection system is prohibited.

[0046] Through the above solution, the state of the switch Q1 can be quickly and accurately controlled according to the number of submodules that can be put into the upper bridge arm and the lower bridge arm, and the number of submodules that need to be put into the lower bridge arm.

[0047] Optionally, in the switching method of the bridge arm submodule provided in an embodiment of the present application, if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than a first preset value, then based on the number of submodules required by the upper bridge arm or the number of submodules required by the lower bridge arm, combined with the first switch or the second switch in the flexible interconnection system, the switching control of the submodules of the converter in the flexible interconnection system includes: if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then judging whether the number of submodules required by the upper bridge arm is not less than the first preset value; if the number of submodules required by the upper bridge arm is not less than the first preset value, closing the second switch in the flexible interconnection system, and controlling the submodules of the multiplexed bridge arm to participate in the switching of the submodules of the upper bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; if the number of submodules required by the upper bridge arm is less than the first preset value, prohibiting the switching control of the submodules of the converter in the flexible interconnection system.

[0048] For example, when the number of submodules that can be put into the upper bridge arm and the lower bridge arm (corresponding to the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm) is greater than or equal to N / 2 (corresponding to the first preset value mentioned above), it can be determined whether the number of submodules that need to be put into the upper bridge arm (corresponding to the number of submodules required for the upper bridge arm) is greater than or equal to N / 2 (corresponding to the first preset value mentioned above); if the number of submodules that need to be put into the upper bridge arm (corresponding to the number of submodules required for the upper bridge arm) is greater than or equal to N / 2 (corresponding to the first preset value mentioned above), the converter control system sends a closed switching switch Q3 (corresponding to the second switch mentioned above) to close the multiplexing bridge arm and the upper bridge arm. The arms cooperate to enter the submodule switching sequence, the N / 2 submodules of the upper bridge arm and the redundant m submodules are switched in sequence to perform dynamic voltage balancing; the reused bridge arm submodule increases the number of modules required by the converter control system module, the N / 2 submodules of the reused bridge arm submodule and the redundant 2m submodules are switched in sequence, the submodule voltage higher than the threshold is exited first, and the submodule voltage lower than the threshold is switched in first to maintain the submodule voltage; if the number of submodules required to be put into the upper bridge arm (corresponding to the number of submodules required by the upper bridge arm mentioned above) is less than N / 2 (corresponding to the first preset value mentioned above), it is prohibited to control the switching of the submodules of the converter in the flexible interconnection system.

[0049] Through the above solution, the state of the switch Q3 can be quickly and accurately controlled according to the number of submodules that can be put into the upper bridge arm and the lower bridge arm, and the number of submodules that need to be put into the upper bridge arm.

[0050] Optionally, in the switching method of the bridge arm submodule provided in the embodiment of the present application, based on the judgment result, combined with the third switch or the fourth switch in the flexible interconnection system, the switching control of the submodule of the converter in the flexible interconnection system includes: if the judgment result indicates that the number of submodules available in the upper bridge arm is greater than the second preset value, then judging whether the number of submodules required by the lower bridge arm is not less than the first preset value; if the number of submodules required by the lower bridge arm is not less than the first preset value, then closing the third switch in the flexible interconnection system, and controlling the target submodule and the first redundant submodule of the multiplexed bridge arm to participate in the switching of the submodule of the lower bridge arm, and controlling the second redundant submodule of the multiplexed bridge arm to participate in the switching of the submodule of the upper bridge arm, so as to complete the switching control of the submodule of the converter in the flexible interconnection system; if the number of submodules required by the lower bridge arm is less than the first preset value, then prohibiting the switching control of the submodule of the converter in the flexible interconnection system.

[0051] For example, when the number of sub-modules that can be invested in the upper bridge arm and the lower bridge arm (corresponding to the number of sub-modules available in the upper bridge arm and the number of sub-modules available in the lower bridge arm mentioned above) is less than N / 2 (corresponding to the first preset value mentioned above), and the number of sub-modules that can be invested in the upper bridge arm (corresponding to the number of sub-modules available in the upper bridge arm mentioned above) is greater than N / 2-m (corresponding to the second preset value mentioned above), it can be determined whether the number of sub-modules required for the lower bridge arm (corresponding to the number of sub-modules required for the lower bridge arm mentioned above) is greater than or equal to N / 2 (corresponding to the first preset value mentioned above); if the number of sub-modules required for the lower bridge arm (corresponding to the number of sub-modules required for the lower bridge arm mentioned above) is greater than If the number of submodules required in the lower bridge arm (corresponding to the number of submodules required in the lower bridge arm) is less than N / 2 (corresponding to the first preset value mentioned above), the converter control system sends a closed switching switch Q4 (corresponding to the third switch mentioned above) to close the circuit, and controls N / 2 (corresponding to the target submodule) and m redundant submodules (corresponding to the first redundant submodule) of the multiplexed bridge arm to participate in the switching of the lower bridge arm submodule, and m redundant submodules (corresponding to the second redundant submodule) to participate in the switching of the upper bridge arm submodule; if the number of submodules required in the lower bridge arm (corresponding to the number of submodules required in the lower bridge arm) is less than N / 2 (corresponding to the first preset value mentioned above), the switching control of the submodules of the converter in the flexible interconnection system is prohibited.

[0052] Through the above solution, the state of the switch Q4 can be quickly and accurately controlled according to the number of submodules that can be put into the upper bridge arm and the lower bridge arm, and the number of submodules that need to be put into the lower bridge arm.

[0053] Optionally, in the switching method of the bridge arm submodule provided in the embodiment of the present application, based on the judgment result, combined with the third switch or the fourth switch in the flexible interconnection system, the switching control of the submodule of the converter in the flexible interconnection system includes: if the judgment result indicates that the number of submodules available in the lower bridge arm is greater than the second preset value, then judging whether the number of submodules required by the upper bridge arm is not less than the first preset value; if the number of submodules required by the upper bridge arm is not less than the first preset value, closing the fourth switch in the flexible interconnection system, and controlling the target submodule and the first redundant submodule of the multiplexed bridge arm to participate in the switching of the submodule of the upper bridge arm, and controlling the second redundant submodule of the multiplexed bridge arm to participate in the switching of the submodule of the lower bridge arm, so as to complete the switching control of the submodule of the converter in the flexible interconnection system; if the number of submodules required by the upper bridge arm is less than the first preset value, prohibiting the switching control of the submodule of the converter in the flexible interconnection system.

[0054] For example, when the number of sub-modules that can be invested in the upper bridge arm and the lower bridge arm (corresponding to the number of sub-modules available in the upper bridge arm and the number of sub-modules available in the lower bridge arm) is less than N / 2 (corresponding to the first preset value mentioned above), and the number of sub-modules that can be invested in the lower bridge arm (corresponding to the number of sub-modules available in the lower bridge arm) is greater than N / 2-m (corresponding to the second preset value mentioned above), it can be determined whether the number of sub-modules required for the upper bridge arm (corresponding to the number of sub-modules required for the upper bridge arm) is greater than or equal to N / 2 (corresponding to the first preset value mentioned above); if the number of sub-modules required for the upper bridge arm (corresponding to the number of sub-modules required for the upper bridge arm) is greater than If the number of submodules required in the upper arm (corresponding to the number of submodules required in the upper arm) is less than N / 2 (corresponding to the first preset value mentioned above), the converter control system sends a closed switching switch Q5 (corresponding to the fourth switch mentioned above) to close the circuit, and controls N / 2 (corresponding to the target submodule) and m redundant submodules (corresponding to the first redundant submodule) of the multiplexed bridge arm to participate in the switching of the upper arm submodule, and m redundant submodules (corresponding to the second redundant submodule) to participate in the switching of the lower arm submodule; if the number of submodules required in the upper arm (corresponding to the number of submodules required in the upper arm) is less than N / 2 (corresponding to the first preset value mentioned above), the switching control of the submodules of the converter in the flexible interconnection system is prohibited.

[0055] Through the above solution, the state of the switch Q5 can be quickly and accurately controlled according to the number of submodules that can be put into the upper bridge arm and the lower bridge arm, and the number of submodules that need to be put into the upper bridge arm.

[0056] Optionally, in the switching method of the bridge arm submodule provided in an embodiment of the present application, based on the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, the switching control of the submodule of the converter in the flexible interconnection system includes: if the judgment result indicates that the number of submodules available in the upper bridge arm or the number of submodules available in the lower bridge arm is not greater than the second preset value, the flexible interconnection system is controlled to be in a locked state, and the switching control of the submodule of the converter in the flexible interconnection system is prohibited.

[0057] For example, when the number of submodules that can be put into use in the upper bridge arm and the lower bridge arm (corresponding to the above-mentioned number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm) is less than N / 2 (corresponding to the above-mentioned first preset value), and the number of submodules that can be put into use in the upper bridge arm or the lower bridge arm (corresponding to the above-mentioned number of submodules available in the upper bridge arm or the number of submodules available in the lower bridge arm) is not greater than N / 2-m (corresponding to the above-mentioned second preset value), the converter control system locks the system.

[0058] Through the above scheme, the operating state of the converter control system can be quickly and accurately controlled according to the number of sub-modules that can be put into use in the upper bridge arm and the lower bridge arm.

[0059] For example, this embodiment provides a switching sequence control method applicable to a medium voltage flexible interconnected bridge arm multiplexing flexible converter, including a converter control system, and Figure 3 The process of the switching method of the bridge arm submodule provided in the embodiment of the present application is as follows Figure 2 ,like Figure 3 As shown, the method comprises the following steps:

[0060] Step 1: The medium voltage flexible interconnection system uses a double-end or multi-end bridge arm multiplexed flexible converter to connect two or more medium voltage smart grids. Each flexible converter contains at least 6 multiplexed bridge arms. Each multiplexed bridge arm consists of an upper bridge arm, a multiplexed bridge arm, and a lower bridge arm. The upper bridge arm and the lower bridge arm are composed of N / 2 (must be configured) and m (redundant configuration) sub-modules, and the multiplexed bridge arm is composed of N / 2 (must be configured) and 2m (redundant configuration) sub-modules.

[0061] Step 2: The multiplexed bridge arm is connected to the AC power grid startup circuit through 5 switching switches. Switch Q1 (corresponding to the first switch mentioned above), switch Q3 (corresponding to the second switch mentioned above), switch Q4 (corresponding to the third switch mentioned above) and switch Q5 (corresponding to the fourth switch mentioned above) are used for switching the upper bridge arm, the multiplexed bridge arm and the lower bridge arm modules during normal operation. Switch Q2 is used to evenly divide the multiplexed bridge arm submodules when the system is started so that the multiplexed bridge arm submodules can participate in the switching of the upper bridge arm and the lower bridge arm submodules at the same time.

[0062] Step 3: The converter control system detects the number of submodules that can be put into the upper bridge arm and the lower bridge arm in real time. When the number of submodules that can be put into the upper bridge arm and the lower bridge arm is greater than N / 2 (corresponding to the first preset value mentioned above), the switch Q1 is used to control the multiplexed bridge arm to participate in the switching of the lower bridge arm submodule, and the switch Q3 is used to control the multiplexed bridge arm to participate in the switching of the upper bridge arm submodule;

[0063] Step 4: The converter control system detects the number of submodules required to be put into operation in the upper bridge arm and the lower bridge arm in real time according to the modulation wave. When it is detected that the number of submodules required to be put into operation in the lower bridge arm is greater than or equal to N / 2 (a maximum of N submodules are required), the converter control system sends a closed switching switch Q1 to close, and the multiplexed bridge arm and the lower bridge arm cooperate to enter the submodule switching sequence, and the N / 2 submodules and the redundant m submodules of the lower bridge arm are switched in sequence to perform dynamic voltage balancing; the multiplexed bridge arm submodule increases the number of modules required by the converter control system module, and the N / 2 submodules of the multiplexed bridge arm submodule and the redundant 2m submodules are switched in sequence. The submodules with a voltage higher than the threshold are exited first, and the submodules with a voltage lower than the threshold are switched in first to maintain the submodule voltage;

[0064] Step 5: When the number of submodules of the multiplexed bridge arm and the lower bridge arm required by the converter control system starts to decrease from N, the submodules of the multiplexed bridge arm are preferentially withdrawn, and the submodules of the multiplexed bridge arm are withdrawn from N to 0 submodules. The submodules are sorted during the withdrawal process. The submodules with voltages higher than the threshold are preferentially withdrawn, and the submodules with voltages lower than the threshold are preferentially put into operation to maintain the submodule voltage.

[0065] Step 6: The converter control system detects the number of submodules required to be put into operation in the upper bridge arm and the lower bridge arm in real time according to the modulation wave. When it is detected that the number of submodules required to be put into operation in the upper bridge arm is greater than or equal to N / 2 (a maximum of N submodules are required), the converter control system sends a closed switching switch Q3 to close, and the reused bridge arm and the upper bridge arm cooperate to enter the submodule switching sequence, and the N / 2 submodules of the upper bridge arm and the redundant m submodules are switched in sequence to perform dynamic voltage balancing; the reused bridge arm submodule increases the number of modules required by the converter control system module, and the N / 2 submodules of the reused bridge arm submodule and the redundant 2m submodules are switched in sequence. The submodules with a voltage higher than the threshold are exited first, and the submodules with a voltage lower than the threshold are switched in first to maintain the submodule voltage;

[0066] Step 7: When the number of submodules of the multiplexed bridge arm and the upper bridge arm required by the converter control system starts to decrease from N, the submodules of the multiplexed bridge arm are preferentially withdrawn, and the submodules of the multiplexed bridge arm are withdrawn from N to 0 submodules. The submodules are sorted during the withdrawal process. The submodules with voltages higher than the threshold are preferentially withdrawn, and the submodules with voltages lower than the threshold are preferentially put into operation, so as to maintain the submodule voltage.

[0067] Step 8: The converter control system detects the number of submodules that can be put into use in the upper bridge arm and the lower bridge arm in real time. When the number of submodules that can be put into use in the lower bridge arm is less than N / 2 (corresponding to the first preset value mentioned above) and greater than N / 2-m (corresponding to the second preset value mentioned above), the switching switch Q5 is used to control the N / 2 and m redundant submodules of the multiplexed bridge arm to participate in the switching of the upper bridge arm submodules and the m redundant submodules to participate in the switching of the lower bridge arm submodules. The switching switch Q1 is used to control the multiplexed bridge arm to participate in the switching of the upper bridge arm submodules.

[0068] Step 9: The converter control system detects the number of submodules required to be put into use in the upper bridge arm and the lower bridge arm in real time according to the modulation wave. When it is detected that the number of submodules required to be put into use in the upper bridge arm is greater than or equal to N / 2 (a maximum of N submodules are required), the converter control system sends a closing switch Q5 to close the m submodules of the multiplexing bridge arm and the submodules of the lower bridge arm to perform switching in sequence and dynamic voltage balancing;

[0069] Step 10: The N / 2+m submodules of the reused bridge arm and the upper bridge arm submodule are increased in number according to the number of modules required by the converter control system module. The N / 2 submodules of the reused bridge arm submodule and the redundant m submodules are switched in sequence. The submodules with voltages higher than the threshold are exited, and the submodules with voltages lower than the threshold are switched in priority to maintain the submodule voltage. The submodules of the upper bridge arm are switched in sequence to perform dynamic voltage balancing.

[0070] Step 11: When the number of submodules of the multiplexed bridge arm and the lower bridge arm required by the converter control system starts to decrease from N, the submodules of the multiplexed bridge arm are preferentially withdrawn, and the submodules of the multiplexed bridge arm are withdrawn from N to 0 submodules. The submodules are sorted during the withdrawal process. The submodules with voltages higher than the threshold are withdrawn, and the submodules with voltages lower than the threshold are preferentially put into operation to maintain the submodule voltage.

[0071] Step 12: Step 4: The converter control system detects the number of sub-modules required to be put into operation in the upper bridge arm and the lower bridge arm in real time according to the modulation wave. When it is detected that the number of sub-modules required to be put into operation in the lower bridge arm is greater than or equal to N / 2 (a maximum of N sub-modules are required), the converter control system sends a closed switching switch Q1 to close, and the multiplexed bridge arm and the lower bridge arm cooperate to enter the sub-module switching sequence, and the N / 2 sub-modules and the redundant m sub-modules of the lower bridge arm are switched in sequence to perform dynamic voltage balancing; the multiplexed bridge arm sub-module increases the number of modules required by the converter control system module, and the N / 2 sub-modules of the multiplexed bridge arm sub-module and the redundant 2m sub-modules are switched in sequence, and the sub-module voltage is higher than the threshold and exits, and the sub-module voltage is lower than the threshold and is put into operation first to maintain the sub-module voltage;

[0072] Step 13: When the number of submodules of the multiplexed bridge arm and the lower bridge arm required by the converter control system starts to decrease from N, the submodules of the multiplexed bridge arm are preferentially withdrawn, and the submodules of the multiplexed bridge arm are withdrawn from N to 0 submodules. The submodules are sorted during the withdrawal process. The submodules with voltages higher than the threshold are withdrawn, and the submodules with voltages lower than the threshold are preferentially put into operation to maintain the submodule voltage.

[0073] Step 14: The converter control system detects the number of submodules that can be put into use in the upper bridge arm and the lower bridge arm in real time. When the number of submodules that can be put into use in the upper bridge arm is less than N / 2 (corresponding to the first preset value mentioned above) and greater than N / 2-m (corresponding to the second preset value mentioned above), the switching switch Q4 is used to control the N / 2 and m redundant submodules of the multiplexed bridge arm to participate in the switching of the lower bridge arm submodules and the m redundant submodules to participate in the switching of the upper bridge arm submodules. The switching switch Q3 is used to control the multiplexed bridge arm to participate in the switching of the upper bridge arm submodules.

[0074] Step 15: Repeat steps 9 to 11, and switch to Q4 and Q3;

[0075] Step 16: The converter control system detects the number of submodules that can be put into use in the upper bridge arm and the lower bridge arm in real time. When the number of submodules that can be put into use in the upper bridge arm or the lower bridge arm is less than N / 2-m (corresponding to the second preset value mentioned above), the converter control system locks the system;

[0076] Step 17: The converter detects the number of submodules that can be put into use in the multiplexed bridge arm submodule. When the number of submodules that can be put into use in the multiplexed bridge arm is less than N / 2-m (corresponding to the second preset value mentioned above), the converter control system locks the system.

[0077] Therefore, the automatic sequencing switching of the medium-voltage flexible interconnected multiplexed bridge arm submodules is realized through this embodiment, and human intervention is reduced, thereby ensuring the safe and stable operation of the new energy distribution network. Moreover, the control method in this embodiment realizes the automatic switching of the submodules of the medium- and low-voltage flexible mutual multiplexed converters based on a switching sequencing control method suitable for medium-voltage flexible interconnected bridge arm multiplexed flexible converters, thereby reducing human intervention and ensuring the safe and stable operation of the energy distribution network.

[0078] In summary, the switching method of the bridge arm submodule provided in the embodiment of the present application obtains the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm, wherein the upper bridge arm and the lower bridge arm are the bridge arms of the converter in the flexible interconnection system, and the flexible interconnection system is used to control the power distribution network; obtains the number of submodules required for the upper bridge arm and the number of submodules required for the lower bridge arm; based on the number of submodules available in the upper bridge arm, the number of submodules available in the lower bridge arm, the number of submodules required for the upper bridge arm, and the number of submodules required for the lower bridge arm, combined with the first switch, the second switch, the third switch and the fourth switch in the flexible interconnection system, the switching of the submodules of the converter in the flexible interconnection system is controlled, wherein the first switch, the second switch, the third switch and the fourth switch in the flexible interconnection system are used to control the switching of the submodules of the upper bridge arm, the multiplexed bridge arm and the lower bridge arm, and the multiplexed bridge arm is the bridge arm of the converter in the flexible interconnection system, thereby solving the problem that the switching control effect of the bridge arm submodules of the converter in the flexible interconnection system in the related art is poor, resulting in low stability of the flexible interconnection system. By obtaining the number of sub-modules available in the upper bridge arm and the number of sub-modules available in the lower bridge arm of the converter in the flexible interconnection system, and obtaining the number of sub-modules required for the upper bridge arm and the number of sub-modules required for the lower bridge arm, and then according to the number of sub-modules available in the upper bridge arm, the number of sub-modules available in the lower bridge arm, the number of sub-modules required for the upper bridge arm and the number of sub-modules required for the lower bridge arm, and by using the first switch, the second switch, the third switch and the fourth switch in the flexible interconnection system, the sub-modules of the converter in the flexible interconnection system are switched on and off, thereby realizing automatic switching of the medium-voltage flexible interconnection multiplexed bridge arm sub-modules, while reducing human intervention operations, thereby achieving the effect of ensuring the safe and stable operation of the new energy distribution network.

[0079] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0080] The present application also provides a switching device for a bridge arm submodule. It should be noted that the switching device for the bridge arm submodule of the present application can be used to execute the switching method for the bridge arm submodule provided in the present application. The switching device for the bridge arm submodule provided in the present application is introduced below.

[0081] Figure 4 Schematic diagram of a switching device for a bridge arm submodule according to an embodiment of the present application. Figure 4 As shown, the device includes: a first acquisition unit 401, a second acquisition unit 402 and a first control unit 403.

[0082] Specifically, the first acquisition unit 401 is used to acquire the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm, wherein the upper bridge arm and the lower bridge arm are bridge arms of the converter in the flexible interconnection system, and the flexible interconnection system is used to control the power distribution network;

[0083] A second acquisition unit 402 is used to acquire the number of submodules required for the upper bridge arm and the number of submodules required for the lower bridge arm;

[0084] The first control unit 403 is used to control the switching of submodules of the converter in the flexible interconnection system based on the number of submodules available in the upper bridge arm, the number of submodules available in the lower bridge arm, the number of submodules required by the upper bridge arm, and the number of submodules required by the lower bridge arm, in combination with the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system, wherein the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system are used to control the switching of submodules of the upper bridge arm, the multiplexed bridge arm, and the lower bridge arm, and the multiplexed bridge arm is the bridge arm of the converter in the flexible interconnection system.

[0085] In summary, the switching device of the bridge arm submodule provided in the embodiment of the present application obtains the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm through the first acquisition unit 401, wherein the upper bridge arm and the lower bridge arm are bridge arms of the converter in the flexible interconnection system, and the flexible interconnection system is used to control the power distribution network; the second acquisition unit 402 obtains the number of submodules required for the upper bridge arm and the number of submodules required for the lower bridge arm; the first control unit 403 controls the switching of the submodules of the converter in the flexible interconnection system based on the number of submodules available in the upper bridge arm, the number of submodules available in the lower bridge arm, the number of submodules required for the upper bridge arm, and the number of submodules required for the lower bridge arm, in combination with the first switch, the second switch, the third switch and the fourth switch in the flexible interconnection system, wherein the first switch, the second switch, the third switch and the fourth switch in the flexible interconnection system are used to control the switching of the submodules of the upper bridge arm, the multiplexed bridge arm and the lower bridge arm, and the multiplexed bridge arm is the bridge arm of the converter in the flexible interconnection system, which solves the problem that the switching control effect of the bridge arm submodule of the converter in the flexible interconnection system in the related art is poor, resulting in low stability of the flexible interconnection system. By obtaining the number of sub-modules available in the upper bridge arm and the number of sub-modules available in the lower bridge arm of the converter in the flexible interconnection system, and obtaining the number of sub-modules required for the upper bridge arm and the number of sub-modules required for the lower bridge arm, and then according to the number of sub-modules available in the upper bridge arm, the number of sub-modules available in the lower bridge arm, the number of sub-modules required for the upper bridge arm and the number of sub-modules required for the lower bridge arm, and by using the first switch, the second switch, the third switch and the fourth switch in the flexible interconnection system, the sub-modules of the converter in the flexible interconnection system are switched on and off, thereby realizing automatic switching of the medium-voltage flexible interconnection multiplexed bridge arm sub-modules, while reducing human intervention operations, thereby achieving the effect of ensuring the safe and stable operation of the new energy distribution network.

[0086] Optionally, in the switching device of the bridge arm submodule provided in the embodiment of the present application, the first control unit includes: a first judgment module, used to judge whether the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than a first preset value; a first control module, used to, if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then according to the number of submodules required by the upper bridge arm or the number of submodules required by the lower bridge arm, combined with the first switch or the second switch in the flexible interconnection system, control the switching of the submodules of the converter in the flexible interconnection system; a second judgment module, used to, if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are both less than the first preset value, then judge whether the number of submodules available in the upper bridge arm or the number of submodules available in the lower bridge arm is greater than the second preset value, and obtain a judgment result, wherein the first preset value is greater than the second preset value; a second control module, used to, based on the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, control the switching of the submodules of the converter in the flexible interconnection system.

[0087] Optionally, in the switching device of the bridge arm sub-module provided in the embodiment of the present application, the first control module includes: a first judgment sub-module, which is used to judge whether the number of sub-modules required for the lower bridge arm is not less than the first preset value if the number of sub-modules available in the upper bridge arm and the number of sub-modules available in the lower bridge arm are not less than the first preset value; a first processing sub-module, which is used to close the first switch in the flexible interconnection system if the number of sub-modules required for the lower bridge arm is not less than the first preset value, and control the sub-modules of the multiplexed bridge arm to participate in the switching of the sub-modules of the lower bridge arm, so as to complete the switching control of the sub-modules of the converter in the flexible interconnection system; and a second processing sub-module, which is used to prohibit the switching control of the sub-modules of the converter in the flexible interconnection system if the number of sub-modules required for the lower bridge arm is less than the first preset value.

[0088] Optionally, in the switching device of the bridge arm sub-module provided in the embodiment of the present application, the first control module includes: a second judgment sub-module, which is used to judge whether the number of sub-modules required for the upper bridge arm is not less than the first preset value if the number of sub-modules available in the upper bridge arm and the number of sub-modules available in the lower bridge arm are not less than the first preset value; a third processing sub-module, which is used to close the second switch in the flexible interconnection system if the number of sub-modules required for the upper bridge arm is not less than the first preset value, and control the sub-modules of the multiplexed bridge arm to participate in the switching of the sub-modules of the upper bridge arm, so as to complete the switching control of the sub-modules of the converter in the flexible interconnection system; and a fourth processing sub-module, which is used to prohibit the switching control of the sub-modules of the converter in the flexible interconnection system if the number of sub-modules required for the upper bridge arm is less than the first preset value.

[0089] Optionally, in the switching device of the bridge arm submodule provided in the embodiment of the present application, the second control module includes: a third judgment submodule, which is used to judge whether the number of submodules required by the lower bridge arm is not less than the first preset value if the judgment result indicates that the number of submodules available in the upper bridge arm is greater than the second preset value; a fifth processing submodule, which is used to close the third switch in the flexible interconnection system if the number of submodules required by the lower bridge arm is not less than the first preset value, and control the target submodule and the first redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the lower bridge arm, and control the second redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the upper bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; and a sixth processing submodule, which is used to prohibit the switching control of the submodules of the converter in the flexible interconnection system if the number of submodules required by the lower bridge arm is less than the first preset value.

[0090] Optionally, in the switching device of the bridge arm submodule provided in the embodiment of the present application, the second control module includes: a fourth judgment submodule, which is used to judge whether the number of submodules required by the upper bridge arm is not less than the first preset value if the judgment result indicates that the number of submodules available in the lower bridge arm is greater than the second preset value; a seventh processing submodule, which is used to close the fourth switch in the flexible interconnection system if the number of submodules required by the upper bridge arm is not less than the first preset value, and control the target submodule and the first redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the upper bridge arm, and control the second redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the lower bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; an eighth processing submodule, which is used to prohibit the switching control of the submodules of the converter in the flexible interconnection system if the number of submodules required by the upper bridge arm is less than the first preset value.

[0091] Optionally, in the switching device of the bridge arm sub-module provided in an embodiment of the present application, the second control module includes: a ninth processing sub-module, which is used to control the flexible interconnection system to be in a locked state and prohibit switching control of the sub-modules of the converter in the flexible interconnection system if the judgment result indicates that the number of sub-modules available in the upper bridge arm or the number of sub-modules available in the lower bridge arm is not greater than a second preset value.

[0092] The switching device of the bridge arm submodule includes a processor and a memory. The above-mentioned first acquisition unit 401, second acquisition unit 402 and first control unit 403 are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize corresponding functions.

[0093] The processor contains a kernel, which calls the corresponding program unit from the memory. One or more kernels can be set, and the kernel parameters can be adjusted to ensure the safe and stable operation of the new energy distribution network.

[0094] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0095] An embodiment of the present invention provides a computer-readable storage medium on which a program is stored. When the program is executed by a processor, the switching method of the bridge arm submodule is implemented.

[0096] An embodiment of the present invention provides a processor, which is used to run a program, wherein the switching method of the bridge arm submodule is executed when the program is running.

[0097] like Figure 5As shown, an embodiment of the present invention provides an electronic device, the device includes a processor, a memory, and a program stored in the memory and executable on the processor, and the processor implements the following steps when executing the program: obtaining the number of sub-modules available in the upper bridge arm and the number of sub-modules available in the lower bridge arm, wherein the upper bridge arm and the lower bridge arm are bridge arms of the converter in the flexible interconnection system, and the flexible interconnection system is used to control the power distribution network; obtaining the number of sub-modules required for the upper bridge arm and the number of sub-modules required for the lower bridge arm; based on the number of sub-modules available in the upper bridge arm, the number of sub-modules available in the lower bridge arm, the number of sub-modules required for the upper bridge arm, and the number of sub-modules required for the lower bridge arm, in combination with the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system, the sub-modules of the converter in the flexible interconnection system are switched on and off, wherein the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system are used to control the switching of sub-modules of the upper bridge arm, the multiplexed bridge arm, and the lower bridge arm, and the multiplexed bridge arm is the bridge arm of the converter in the flexible interconnection system.

[0098] When the processor executes the program, the following steps are also implemented: based on the number of sub-modules available in the upper bridge arm, the number of sub-modules available in the lower bridge arm, the number of sub-modules required in the upper bridge arm, and the number of sub-modules required in the lower bridge arm, in combination with the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system, the sub-modules of the converter in the flexible interconnection system are switched on and off, including: judging whether the number of sub-modules available in the upper bridge arm and the number of sub-modules available in the lower bridge arm are not less than a first preset value; if the number of sub-modules available in the upper bridge arm and the number of sub-modules available in the lower bridge arm are not less than the first preset value, The number of modules or the number of sub-modules required for the lower bridge arm, combined with the first switch or the second switch in the flexible interconnection system, controls the switching of the sub-modules of the converter in the flexible interconnection system; if the number of sub-modules available in the upper bridge arm and the number of sub-modules available in the lower bridge arm are both less than the first preset value, judge whether the number of sub-modules available in the upper bridge arm or the number of sub-modules available in the lower bridge arm is greater than the second preset value, and obtain a judgment result, wherein the first preset value is greater than the second preset value; based on the judgment result, combined with the third switch or the fourth switch in the flexible interconnection system, controls the switching of the sub-modules of the converter in the flexible interconnection system.

[0099] When the processor executes the program, the following steps are also implemented: if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then according to the number of submodules required by the upper bridge arm or the number of submodules required by the lower bridge arm, combined with the first switch or the second switch in the flexible interconnection system, the submodules of the converter in the flexible interconnection system are switched on and off, including: if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then it is determined whether the number of submodules required by the lower bridge arm is not less than the first preset value; if the number of submodules required by the lower bridge arm is not less than the first preset value, then the first switch in the flexible interconnection system is closed, and the submodules of the multiplexed bridge arm are controlled to participate in the switching of the submodules of the lower bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; if the number of submodules required by the lower bridge arm is less than the first preset value, then the switching control of the submodules of the converter in the flexible interconnection system is prohibited.

[0100] When the processor executes the program, the following steps are also implemented: if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then according to the number of submodules required by the upper bridge arm or the number of submodules required by the lower bridge arm, combined with the first switch or the second switch in the flexible interconnection system, the submodules of the converter in the flexible interconnection system are controlled to be switched, including: if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then it is determined whether the number of submodules required by the upper bridge arm is not less than the first preset value; if the number of submodules required by the upper bridge arm is not less than the first preset value, then the second switch in the flexible interconnection system is closed, and the submodules of the multiplexed bridge arm are controlled to participate in the switching of the submodules of the upper bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; if the number of submodules required by the upper bridge arm is less than the first preset value, then the switching control of the submodules of the converter in the flexible interconnection system is prohibited.

[0101] When the processor executes the program, the following steps are also implemented: according to the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, the switching control of the submodules of the converter in the flexible interconnection system includes: if the judgment result indicates that the number of submodules available in the upper bridge arm is greater than the second preset value, then it is judged whether the number of submodules required by the lower bridge arm is not less than the first preset value; if the number of submodules required by the lower bridge arm is not less than the first preset value, then the third switch in the flexible interconnection system is closed, and the target submodule and the first redundant submodule of the multiplexed bridge arm are controlled to participate in the switching of the submodules of the lower bridge arm, and the second redundant submodule of the multiplexed bridge arm is controlled to participate in the switching of the submodules of the upper bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; if the number of submodules required by the lower bridge arm is less than the first preset value, then the switching control of the submodules of the converter in the flexible interconnection system is prohibited.

[0102] When the processor executes the program, the following steps are also implemented: according to the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, the switching control of the submodules of the converter in the flexible interconnection system includes: if the judgment result indicates that the number of submodules available in the lower bridge arm is greater than the second preset value, then judging whether the number of submodules required by the upper bridge arm is not less than the first preset value; if the number of submodules required by the upper bridge arm is not less than the first preset value, then closing the fourth switch in the flexible interconnection system, and controlling the target submodule and the first redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the upper bridge arm, and controlling the second redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the lower bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; if the number of submodules required by the upper bridge arm is less than the first preset value, then prohibiting the switching control of the submodules of the converter in the flexible interconnection system.

[0103] When the processor executes the program, the following steps are also implemented: according to the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, the switching control of the sub-modules of the converter in the flexible interconnection system includes: if the judgment result indicates that the number of sub-modules available in the upper bridge arm or the number of sub-modules available in the lower bridge arm is not greater than the second preset value, the flexible interconnection system is controlled to be in a locked state, and the switching control of the sub-modules of the converter in the flexible interconnection system is prohibited.

[0104] The devices in this article can be servers, PCs, PADs, mobile phones, etc.

[0105] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program that is initialized with the following method steps: obtaining the number of sub-modules available in the upper bridge arm and the number of sub-modules available in the lower bridge arm, wherein the upper bridge arm and the lower bridge arm are bridge arms of a converter in a flexible interconnection system, and the flexible interconnection system is used to control a power distribution network; obtaining the number of sub-modules required for the upper bridge arm and the number of sub-modules required for the lower bridge arm; based on the number of sub-modules available in the upper bridge arm, the number of sub-modules available in the lower bridge arm, the number of sub-modules required for the upper bridge arm, and the number of sub-modules required for the lower bridge arm, in combination with a first switch, a second switch, a third switch, and a fourth switch in the flexible interconnection system, controlling the switching of sub-modules of the converter in the flexible interconnection system, wherein the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system are used to control the switching of sub-modules of the upper bridge arm, the multiplexed bridge arm, and the lower bridge arm, and the multiplexed bridge arm is the bridge arm of the converter in the flexible interconnection system.

[0106] When executed on a data processing device, the method is also suitable for executing a program having the following method steps for initialization: based on the number of submodules available in the upper bridge arm, the number of submodules available in the lower bridge arm, the number of submodules required in the upper bridge arm, and the number of submodules required in the lower bridge arm, in combination with the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system, the submodules of the converter in the flexible interconnection system are switched on and off, including: judging whether the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are both not less than a first preset value; if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are both not less than the first preset value, then switching on and off the submodules of the converter in the flexible interconnection system is controlled according to the following method steps: According to the number of submodules required by the upper bridge arm or the number of submodules required by the lower bridge arm, combined with the first switch or the second switch in the flexible interconnection system, the submodules of the converter in the flexible interconnection system are switched on and off; if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are both less than the first preset value, it is determined whether the number of submodules available in the upper bridge arm or the number of submodules available in the lower bridge arm is greater than the second preset value, and a determination result is obtained, wherein the first preset value is greater than the second preset value; according to the determination result, combined with the third switch or the fourth switch in the flexible interconnection system, the submodules of the converter in the flexible interconnection system are switched on and off.

[0107] When executed on a data processing device, it is also suitable for executing a program that is initialized with the following method steps: if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than a first preset value, then according to the number of submodules required by the upper bridge arm or the number of submodules required by the lower bridge arm, combined with the first switch or the second switch in the flexible interconnection system, the submodules of the converter in the flexible interconnection system are controlled to be switched, including: if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then it is determined whether the number of submodules required by the lower bridge arm is not less than the first preset value; if the number of submodules required by the lower bridge arm is not less than the first preset value, then the first switch in the flexible interconnection system is closed, and the submodules of the multiplexed bridge arm are controlled to participate in the switching of the submodules of the lower bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; if the number of submodules required by the lower bridge arm is less than the first preset value, then the switching control of the submodules of the converter in the flexible interconnection system is prohibited.

[0108] When executed on a data processing device, it is also suitable for executing a program initialized with the following method steps: if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than a first preset value, then according to the number of submodules required by the upper bridge arm or the number of submodules required by the lower bridge arm, combined with the first switch or the second switch in the flexible interconnection system, the submodules of the converter in the flexible interconnection system are controlled to be switched, including: if the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then it is determined whether the number of submodules required by the upper bridge arm is not less than the first preset value; if the number of submodules required by the upper bridge arm is not less than the first preset value, then the second switch in the flexible interconnection system is closed, and the submodules of the multiplexed bridge arm are controlled to participate in the switching of the submodules of the upper bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; if the number of submodules required by the upper bridge arm is less than the first preset value, then the switching control of the submodules of the converter in the flexible interconnection system is prohibited.

[0109] When executed on a data processing device, it is also suitable for executing a program that is initialized with the following method steps: according to the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, the switching control of the submodules of the converter in the flexible interconnection system includes: if the judgment result indicates that the number of submodules available in the upper bridge arm is greater than the second preset value, then judging whether the number of submodules required by the lower bridge arm is not less than the first preset value; if the number of submodules required by the lower bridge arm is not less than the first preset value, then closing the third switch in the flexible interconnection system, and controlling the target submodule and the first redundant submodule of the multiplexed bridge arm to participate in the switching of the submodule of the lower bridge arm, and controlling the second redundant submodule of the multiplexed bridge arm to participate in the switching of the submodule of the upper bridge arm, so as to complete the switching control of the submodule of the converter in the flexible interconnection system; if the number of submodules required by the lower bridge arm is less than the first preset value, then prohibiting the switching control of the submodule of the converter in the flexible interconnection system.

[0110] When executed on a data processing device, it is also suitable for executing a program initialized with the following method steps: according to the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, the switching control of the submodules of the converter in the flexible interconnection system includes: if the judgment result indicates that the number of submodules available in the lower bridge arm is greater than the second preset value, then judging whether the number of submodules required by the upper bridge arm is not less than the first preset value; if the number of submodules required by the upper bridge arm is not less than the first preset value, closing the fourth switch in the flexible interconnection system, and controlling the target submodule and the first redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the upper bridge arm, and controlling the second redundant submodule of the multiplexed bridge arm to participate in the switching of the submodules of the lower bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; if the number of submodules required by the upper bridge arm is less than the first preset value, prohibiting the switching control of the submodules of the converter in the flexible interconnection system.

[0111] When executed on a data processing device, it is also suitable for executing a program that is initialized with the following method steps: based on the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, the sub-modules of the converter in the flexible interconnection system are controlled to be switched, including: if the judgment result indicates that the number of sub-modules available in the upper bridge arm or the number of sub-modules available in the lower bridge arm is not greater than the second preset value, the flexible interconnection system is controlled to be in a locked state, and the switching control of the sub-modules of the converter in the flexible interconnection system is prohibited.

[0112] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0113] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0114] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0115] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0116] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0117] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0118] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0119] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0120] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0121] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for switching a bridge arm submodule, characterized in that: include: Obtaining the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm, wherein the upper bridge arm and the lower bridge arm are bridge arms of a converter in a flexible interconnection system, and the flexible interconnection system is used to control a power distribution network; Obtaining the number of submodules required for the upper bridge arm and the number of submodules required for the lower bridge arm; Based on the number of submodules available in the upper bridge arm, the number of submodules available in the lower bridge arm, the number of submodules required by the upper bridge arm, and the number of submodules required by the lower bridge arm, in combination with the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system, the submodules of the converter in the flexible interconnection system are switched on and off, wherein the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system are used to control the switching of the submodules of the upper bridge arm, the multiplexed bridge arm, and the lower bridge arm, and the multiplexed bridge arm is the bridge arm of the converter in the flexible interconnection system.

2. The method according to claim 1, characterized in that Based on the number of submodules available in the upper bridge arm, the number of submodules available in the lower bridge arm, the number of submodules required by the upper bridge arm, and the number of submodules required by the lower bridge arm, in combination with the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system, switching control of submodules of the converter in the flexible interconnection system includes: Determine whether the number of submodules available for the upper bridge arm and the number of submodules available for the lower bridge arm are both not less than a first preset value; If the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, the submodules of the converter in the flexible interconnection system are switched on and off according to the number of submodules required by the upper bridge arm or the number of submodules required by the lower bridge arm in combination with the first switch or the second switch in the flexible interconnection system; If the number of submodules available to the upper bridge arm and the number of submodules available to the lower bridge arm are both less than the first preset value, determining whether the number of submodules available to the upper bridge arm or the number of submodules available to the lower bridge arm is greater than a second preset value, and obtaining a determination result, wherein the first preset value is greater than the second preset value; According to the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, switching control is performed on the submodules of the converter in the flexible interconnection system.

3. The method according to claim 2, characterized in that If the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then according to the number of submodules required by the upper bridge arm or the number of submodules required by the lower bridge arm, combined with the first switch or the second switch in the flexible interconnection system, switching control of the submodules of the converter in the flexible interconnection system includes: If the number of submodules available for the upper bridge arm and the number of submodules available for the lower bridge arm are both not less than the first preset value, determining whether the number of submodules required for the lower bridge arm is not less than the first preset value; If the number of submodules required by the lower bridge arm is not less than the first preset value, the first switch in the flexible interconnection system is closed, and the submodules of the multiplexing bridge arm are controlled to participate in the switching of the submodules of the lower bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; If the number of submodules required by the lower bridge arm is less than the first preset value, switching control of the submodules of the converter in the flexible interconnection system is prohibited.

4. The method according to claim 2, characterized in that: If the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm are not less than the first preset value, then according to the number of submodules required by the upper bridge arm or the number of submodules required by the lower bridge arm, combined with the first switch or the second switch in the flexible interconnection system, switching control of the submodules of the converter in the flexible interconnection system includes: If the number of submodules available for the upper bridge arm and the number of submodules available for the lower bridge arm are both not less than the first preset value, determining whether the number of submodules required for the upper bridge arm is not less than the first preset value; If the number of submodules required by the upper bridge arm is not less than the first preset value, the second switch in the flexible interconnection system is closed, and the submodules of the multiplexed bridge arm are controlled to participate in the switching of the submodules of the upper bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; If the number of submodules required by the upper bridge arm is less than the first preset value, switching control of the submodules of the converter in the flexible interconnection system is prohibited.

5. The method according to claim 2, characterized in that: According to the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, switching control of the submodule of the converter in the flexible interconnection system includes: If the judgment result indicates that the number of submodules available for the upper bridge arm is greater than the second preset value, then judging whether the number of submodules required for the lower bridge arm is not less than the first preset value; If the number of submodules required by the lower bridge arm is not less than the first preset value, the third switch in the flexible interconnection system is closed, and the target submodule and the first redundant submodule of the multiplexed bridge arm are controlled to participate in the switching of the submodules of the lower bridge arm, and the second redundant submodule of the multiplexed bridge arm is controlled to participate in the switching of the submodules of the upper bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; If the number of submodules required by the lower bridge arm is less than the first preset value, switching control of the submodules of the converter in the flexible interconnection system is prohibited.

6. The method according to claim 2, characterized in that According to the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, switching control of the submodule of the converter in the flexible interconnection system includes: If the judgment result indicates that the number of submodules available for the lower bridge arm is greater than the second preset value, then judging whether the number of submodules required for the upper bridge arm is not less than the first preset value; If the number of submodules required by the upper bridge arm is not less than the first preset value, the fourth switch in the flexible interconnection system is closed, and the target submodule and the first redundant submodule of the multiplexed bridge arm are controlled to participate in the switching of the submodules of the upper bridge arm, and the second redundant submodule of the multiplexed bridge arm is controlled to participate in the switching of the submodules of the lower bridge arm, so as to complete the switching control of the submodules of the converter in the flexible interconnection system; If the number of submodules required by the upper bridge arm is less than the first preset value, switching control of the submodules of the converter in the flexible interconnection system is prohibited.

7. The method according to claim 2, characterized in that According to the judgment result, in combination with the third switch or the fourth switch in the flexible interconnection system, switching control of the submodule of the converter in the flexible interconnection system includes: If the judgment result indicates that the number of submodules available in the upper bridge arm or the number of submodules available in the lower bridge arm is not greater than the second preset value, the flexible interconnection system is controlled to be in a locked state, and switching control of the submodules of the converter in the flexible interconnection system is prohibited.

8. A switching device for a bridge arm submodule, characterized in that: include: A first acquisition unit is used to acquire the number of submodules available in the upper bridge arm and the number of submodules available in the lower bridge arm, wherein the upper bridge arm and the lower bridge arm are bridge arms of a converter in a flexible interconnection system, and the flexible interconnection system is used to control a power distribution network; A second acquisition unit, used to acquire the number of submodules required for the upper bridge arm and the number of submodules required for the lower bridge arm; A first control unit is used to control the switching of submodules of the converter in the flexible interconnection system based on the number of submodules available in the upper bridge arm, the number of submodules available in the lower bridge arm, the number of submodules required by the upper bridge arm, and the number of submodules required by the lower bridge arm, in combination with the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system, wherein the first switch, the second switch, the third switch, and the fourth switch in the flexible interconnection system are used to control the switching of submodules of the upper bridge arm, the multiplexed bridge arm, and the lower bridge arm, and the multiplexed bridge arm is the bridge arm of the converter in the flexible interconnection system.

9. A computer-readable storage medium, characterized in that: The storage medium stores a program, wherein the program executes the switching method of the bridge arm submodule according to any one of claims 1 to 7.

10. An electronic device, characterized in that: It includes one or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the switching method of the bridge arm submodule described in any one of claims 1 to 7.

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