Control method and device of flexible interconnection system, storage medium and electronic equipment

Abstract

The invention discloses a control method and device of a flexible interconnection system, a storage medium and electronic equipment, and relates to the technical field of power distribution networks. The method comprises the following steps: receiving a control instruction for controlling the flexible interconnection system through a main controller; according to the control instruction, obtaining electrical state information of each power module of a converter in the flexible interconnection system; based on the electrical state information of each power module of the converter in the flexible interconnection system, generating modulation information corresponding to each power module, and obtaining a modulation information set; and sending each piece of modulation information in the modulation information set to the corresponding power module, and controlling the operation of a converter in the flexible interconnection system through the modulation information in the modulation information set. According to the method and the device, the problem that the effect of controlling the operation of each converter in the flexible interconnection system is relatively poor in the related technology is solved.

Description

Technical Field

[0001] The present application relates to the technical field of power distribution networks, and in particular to a control method and device, a storage medium and an electronic device for a flexible interconnection system. Background Art

[0002] In the related art, the control and protection scheme of the converter of the flexible interconnection system generally adopts multiple control and protection devices to control each converter in the flexible interconnection system respectively, that is, each converter in the flexible interconnection system is controlled by a control and protection device. For example, in the related art, four control and protection devices can be used to control the four parts of DCT, CHB, CHB1, and CHB2 respectively (corresponding to Figure 2 The four converters (DCT, CHB, CHB1, and CHB2) in the interconnected system complete their own independent control strategies and protection functions. The upper layer is equipped with a cooperative control device to complete the centralized management and energy optimization of the AC feeders and equipment in the interconnected system, and control the start and stop, control mode, and operating power of each converter. The control layer designed in this way has more hardware, more levels, and longer control link delays, which has an adverse effect on the maintainability, compactness, and reliability of the equipment.

[0003] Moreover, in combination with the topological structure characteristics of the flexible interconnection device involved in the related art, if a method of using multiple converters to control them separately and then equipping them with an upper-layer coordination controller in the related art has the following limitations:

[0004] (1) The complexity of the control (communication) link leads to reduced reliability. Since the CHB and CHB1, CHB2 and DCT (corresponding to Figure 2 The correlation between the four converters (CHB, CHB1, CHB2, and DCT) in the converter needs to transmit information to each other during the operation of the converter. For example, the DC side of the CHB is directly connected to the primary side of the DCT. When a unit of the DCT fails and bypass measures are required, the corresponding unit of the CHB also needs to be bypassed synchronously. At this time, if the CHB and DCT each use a separate control and protection device, an external communication interface synchronization unit status information needs to be added between the two control devices. If a communication failure occurs, it will cause the failure of the synchronous bypass and cause the failure of the entire machine, increasing the probability of the system stopping operation.

[0005] (2) The double-layer controller has high cost and complex control strategy.

[0006] With regard to the problem in the related art that the effect of controlling the operation of each converter in the flexible interconnection system is poor, no effective solution has been proposed yet. Summary of the invention

[0007] The main purpose of the present application is to provide a control method and device, a storage medium and an electronic device for a flexible interconnection system, so as to solve the problem of poor effect of controlling the operation of each converter in the flexible interconnection system in the related art.

[0008] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a control method for a flexible interconnection system is provided. The method comprises: receiving a control instruction for controlling a flexible interconnection system through a main controller, wherein the flexible interconnection system is used to control the operating state of equipment in a distribution network; obtaining electrical state information of each power module of a converter in the flexible interconnection system according to the control instruction, wherein the electrical state information of each power module at least includes: voltage information, current information and switch information of a target switch, wherein the target switch is a switch in each power module; based on the electrical state information of each power module of the converter in the flexible interconnection system, generating modulation information corresponding to each power module to obtain a modulation information set; sending each modulation information in the modulation information set to its corresponding power module, and controlling the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set.

[0009] Further, controlling the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set includes: judging whether the flexible interconnection system is in a state where startup is allowed; if the flexible interconnection system is in a state where startup is prohibited, prohibiting startup of the flexible interconnection system; if the flexible interconnection system is in a state where startup is allowed, determining a startup mode corresponding to the flexible interconnection system according to the modulation information in the modulation information set; starting the converter in the flexible interconnection system according to the startup mode corresponding to the flexible interconnection system and based on the received startup command, and controlling the operation of the converter in the flexible interconnection system.

[0010] Further, if the converters in the flexible interconnection system include: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect a first AC port, the second converter is used to connect the first AC port and the second AC port, the third converter is used to connect the first AC port and the third AC port, and the fourth converter is used to connect a DC port, then according to the startup mode corresponding to the flexible interconnection system and based on the received startup command, starting the converters in the flexible interconnection system includes: according to the startup mode corresponding to the flexible interconnection system and based on the received startup command, charging the first converter and charging the first converter; When the voltage value of the second converter is equal to the first preset value, the second converter is charged; when the voltage value of the second converter is equal to the second preset value, the third converter is charged, and when the voltage value of the third converter is equal to the third preset value, the first converter is unlocked; after the first converter is unlocked, the second converter is unlocked, and after the second converter is unlocked, the third converter is unlocked; after the third converter is unlocked, the fourth converter is unlocked, and after the fourth converter is unlocked, the process of starting the converters in the flexible interconnection system is completed.

[0011] Further, if the converter in the flexible interconnection system includes: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect a first AC port, the second converter is used to connect the first AC port and the second AC port, the third converter is used to connect the first AC port and the third AC port, and the fourth converter is used to connect a DC port, then controlling the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set includes: calculating the sum of the power of the second AC port, the power of the third AC port and the power of the DC port to obtain the total power; judging whether the total power is greater than the first the rated power of the AC port; if the total power is not greater than the rated power of the first AC port, controlling the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set; if the total power is greater than the rated power of the first AC port, limiting the power of the second AC port, the power of the third AC port and the power of the DC port to obtain the limited power, wherein the limiting processing includes reducing the power of the second AC port, the power of the third AC port and the power of the DC port; controlling the operation of the converter in the flexible interconnection system according to the modulation information in the modulation information set and the limited power.

[0012] Further, if the converters in the flexible interconnection system include: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect a first AC port, the second converter is used to connect the first AC port and the second AC port, the third converter is used to connect the first AC port and the third AC port, and the fourth converter is used to connect a DC port, then controlling the operation of the converters in the flexible interconnection system through the modulation information in the modulation information set includes: judging whether there is a faulty converter among the converters in the flexible interconnection system; if there is no faulty converter among the converters in the flexible interconnection system, controlling the operation of the converters in the flexible interconnection system through the modulation information in the modulation information set; if there is a faulty converter among the converters in the flexible interconnection system, processing the faulty converter, and controlling the operation of the converters in the flexible interconnection system based on the processed converter and the modulation information in the modulation information set.

[0013] Furthermore, if there is a faulty converter among the converters in the flexible interconnection system, processing the faulty converter includes: if a first converter in the flexible interconnection system fails, determining whether the number of bypass modules corresponding to the first converter is greater than a first preset number; if the number of bypass modules corresponding to the first converter is not greater than the first preset number, bypassing the target faulty module and bypassing the module in the fourth converter corresponding to the target faulty module, wherein the target faulty module is the faulty module in the first converter; if the number of bypass modules corresponding to the first converter is greater than the first preset number, all of the first converter, the second converter, the third converter and the fourth converter are locked.

[0014] Furthermore, if there is a faulty converter among the converters in the flexible interconnection system, processing the faulty converter includes: if a second converter in the flexible interconnection system fails, determining whether the number of bypass modules corresponding to the second converter is greater than a second preset number; if the number of bypass modules corresponding to the second converter is not greater than the second preset number, bypassing the faulty module in the second converter, and controlling the second converter to continue operating; if the number of bypass modules corresponding to the second converter is greater than the second preset number, locking the second converter, and controlling the first converter, the third converter, and the fourth converter to continue operating.

[0015] In order to achieve the above-mentioned purpose, according to another aspect of the present application, a control device for a flexible interconnection system is provided. The device includes: a first receiving unit, which is used to receive a control instruction for controlling the flexible interconnection system through a main controller, wherein the flexible interconnection system is used to control the operating state of equipment in a distribution network; a first acquisition unit, which is used to acquire the electrical state information of each power module of the converter in the flexible interconnection system according to the control instruction, wherein the electrical state information of each power module at least includes: voltage information, current information and switch information of a target switch, wherein the target switch is a switch in each power module; a first generation unit, which is used to generate modulation information corresponding to each power module based on the electrical state information of each power module of the converter in the flexible interconnection system, and obtain a modulation information set; a first processing unit, which is used to send each modulation information in the modulation information set to its corresponding power module, and control the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set.

[0016] Further, the first processing unit includes: a first judgment module, used to judge whether the flexible interconnection system is in a state where startup is allowed; a first processing module, used to prohibit the startup of the flexible interconnection system if the flexible interconnection system is in a state where startup is prohibited; a first determination module, used to determine the startup mode corresponding to the flexible interconnection system according to the modulation information in the modulation information set if the flexible interconnection system is in a state where startup is allowed; and a second processing module, used to start the converter in the flexible interconnection system according to the startup mode corresponding to the flexible interconnection system and based on the received startup command, and control the operation of the converter in the flexible interconnection system.

[0017] Further, if the converters in the flexible interconnection system include: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect the first AC port, the second converter is used to connect the first AC port and the second AC port, the third converter is used to connect the first AC port and the third AC port, and the fourth converter is used to connect the DC port, then the second processing module includes: a first charging submodule, which is used to charge the first converter based on the received startup command according to the startup mode corresponding to the flexible interconnection system, and charge the second converter when the voltage value of the first converter is equal to the first preset value ; A first processing submodule, used for charging the third converter when the voltage value of the second converter is equal to a second preset value, and unlocking the first converter when the voltage value of the third converter is equal to a third preset value; a second processing submodule, used for unlocking the second converter after the first converter is unlocked, and unlocking the third converter after the second converter is unlocked; a third processing submodule, used for unlocking the fourth converter after the third converter is unlocked, and completing the process of starting the converters in the flexible interconnection system after the fourth converter is unlocked.

[0018] Further, if the converters in the flexible interconnection system include: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect the first AC port, the second converter is used to connect the first AC port and the second AC port, the third converter is used to connect the first AC port and the third AC port, and the fourth converter is used to connect the DC port, then the first processing unit includes: a first calculation module, used to calculate the sum of the power of the second AC port, the power of the third AC port and the power of the DC port to obtain the total power; a second judgment module, used to judge whether the total power is greater than the rated power of the first AC port; a first control module, used to If the total power is not greater than the rated power of the first AC port, the operation of the converter in the flexible interconnection system is controlled by the modulation information in the modulation information set; a third processing module is used to limit the power of the second AC port, the power of the third AC port and the power of the DC port to obtain the limited power if the total power is greater than the rated power of the first AC port, wherein the limiting processing includes reducing the power of the second AC port, the power of the third AC port and the power of the DC port; a second control module is used to control the operation of the converter in the flexible interconnection system according to the modulation information in the modulation information set and the limited power.

[0019] Further, if the converters in the flexible interconnection system include: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect the first AC port, the second converter is used to connect the first AC port and the second AC port, the third converter is used to connect the first AC port and the third AC port, and the fourth converter is used to connect the DC port, then the first processing unit includes: a third judgment module, used to judge whether there is a faulty converter among the converters in the flexible interconnection system; a third control module, used to control the operation of the converters in the flexible interconnection system through the modulation information in the modulation information set if there is no faulty converter among the converters in the flexible interconnection system; a fourth processing module, used to process the faulty converter if there is a faulty converter among the converters in the flexible interconnection system, and control the operation of the converters in the flexible interconnection system based on the processed converter and the modulation information in the modulation information set.

[0020] Furthermore, the fourth processing module includes: a first judgment submodule, used to determine whether the number of bypass modules corresponding to the first converter in the flexible interconnection system is greater than a first preset number if a fault occurs in the first converter; a fourth processing submodule, used to bypass the target fault module if the number of bypass modules corresponding to the first converter is not greater than the first preset number, and bypass the module in the fourth converter corresponding to the target fault module, wherein the target fault module is the fault module in the first converter; a fifth processing submodule, used to lock all the first converter, the second converter, the third converter and the fourth converter if the number of bypass modules corresponding to the first converter is greater than the first preset number.

[0021] Furthermore, the fourth processing module includes: a second judgment submodule, which is used to determine whether the number of bypass modules corresponding to the second converter in the flexible interconnection system is greater than a second preset number if a fault occurs in the second converter; a sixth processing submodule, which is used to bypass the faulty module in the second converter and control the second converter to continue operating if the number of bypass modules corresponding to the second converter is not greater than the second preset number; and a seventh processing submodule, which is used to lock the second converter and control the first converter, the third converter and the fourth converter to continue operating if the number of bypass modules corresponding to the second converter is greater than the second preset number.

[0022] In order to achieve the above-mentioned purpose, 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 control methods for the flexible interconnection system.

[0023] 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 control methods of the flexible interconnection system.

[0024] Through the present application, the following steps are adopted: receiving a control instruction for controlling a flexible interconnection system through a main controller, wherein the flexible interconnection system is used to control the operating status of equipment in a distribution network; obtaining electrical status information of each power module of a converter in the flexible interconnection system according to the control instruction, wherein the electrical status information of each power module includes at least: voltage information, current information and switch information of a target switch, and the target switch is a switch in each power module; based on the electrical status information of each power module of the converter in the flexible interconnection system, generating modulation information corresponding to each power module to obtain a modulation information set; sending each modulation information in the modulation information set to its corresponding power module, and controlling the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set, thereby solving the problem of poor effect of controlling the operation of each converter in the flexible interconnection system in the related art. A main controller is used to complete the system analog quantity and switch quantity sampling, receive the reference instructions (i.e. control instructions) issued by the monitoring system, receive the power module information (i.e. the electrical status information of each power module), implement the core control algorithm, the stable switching of each operating mode and the fault response, generate modulation information, and then send the modulation information generated by the main controller to the corresponding power module through optical fiber, so as to integrate the coordinated control strategy and the control and protection functions of each converter into a main controller. All information is transmitted within the device, which improves the rapidity of power module information interaction, is beneficial to the synchronous control of the modules, and improves the stability, compactness and economy of the control device, thereby improving the effect of controlling the operation of each converter in the flexible interconnection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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:

[0026] Figure 1 is a flow chart of a control method of a flexible interconnection system provided according to an embodiment of the present application;

[0027] Figure 2 is a schematic diagram of the AC / DC hybrid flexible interconnection system topology in this embodiment;

[0028] Figure 3 is an architecture diagram of a control flexible interconnection system provided according to an embodiment of the present application;

[0029] Figure 4 is a flow chart of an optional control method of a flexible interconnection system provided according to an embodiment of the present application;

[0030] Figure 5 is a flowchart of module fault processing provided in an embodiment of the present application;

[0031] Figure 6 is a schematic diagram of a control device of a flexible interconnection system provided according to an embodiment of the present application;

[0032] Figure 7 is a schematic diagram of an electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The present invention is described below in conjunction with preferred implementation steps. Figure 1 is a flow chart of a control method of a flexible interconnection system provided in an embodiment of the present application. Figure 1 As shown, the method comprises the following steps:

[0038] Step S101: receiving a control instruction for controlling a flexible interconnection system through a main controller, wherein the flexible interconnection system is used to control the operating status of equipment in a power distribution network.

[0039] For example, a main controller receives a reference instruction (corresponding to the above control instruction) issued by a monitoring system, and the reference instruction (corresponding to the above control instruction) is used to control the operation of the flexible interconnection system. Moreover, the flexible interconnection system can be used to control the operating status of equipment in the distribution network.

[0040] Step S102, according to the control instruction, obtain the electrical status information of each power module of the converter in the flexible interconnection system, wherein the electrical status information of each power module at least includes: voltage information, current information and switch information of the target switch, and the target switch is the switch in each power module.

[0041] For example, after receiving the reference instruction (corresponding to the above-mentioned control instruction) issued by the monitoring system, the main controller receives the information of each power module of the converter in the flexible interconnection system (corresponding to the above-mentioned electrical status information), and can receive the voltage, current and switching information of the switch in the power module.

[0042] Step S103: Based on the electrical state information of each power module of the converter in the flexible interconnection system, modulation information corresponding to each power module is generated to obtain a modulation information set.

[0043] For example, the main controller generates modulation information (corresponding to the modulation information corresponding to each power module mentioned above) according to the received power module information (corresponding to the electrical state information of each power module of the converter in the above flexible interconnection system).

[0044] Step S104: Send each modulation information in the modulation information set to its corresponding power module, and control the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set.

[0045] For example, the main controller can send the generated modulation information (corresponding to the modulation information corresponding to each of the above-mentioned power modules) to the corresponding power module (corresponding to the above-mentioned power module corresponding thereto) through optical fiber, so as to control the operation of the converter in the flexible interconnection system through the generated modulation information (corresponding to the modulation information corresponding to each of the above-mentioned power modules).

[0046] Through the above steps S101 to S104, a main controller completes the system analog quantity and switch quantity sampling, receives the reference instruction (i.e., control instruction) issued by the monitoring system, receives the power module information (i.e., the electrical status information of each power module), implements the core control algorithm, the stable switching of each operating mode and the fault response, generates modulation information, and then sends the modulation information generated by the main controller to the corresponding power module through the optical fiber, thereby integrating the coordinated control strategy and the control and protection functions of each converter into a main controller, and all information is transmitted within the device, which improves the rapidity of the power module information interaction, is beneficial to the synchronous control of the module, and improves the stability, compactness and economy of the control device, thereby improving the effect of controlling the operation of each converter in the flexible interconnection system.

[0047] Optionally, in the control method of the flexible interconnection system provided in the embodiment of the present application, controlling the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set includes: judging whether the flexible interconnection system is in a state where startup is allowed; if the flexible interconnection system is in a state where startup is prohibited, prohibiting startup of the flexible interconnection system; if the flexible interconnection system is in a state where startup is allowed, determining the startup mode corresponding to the flexible interconnection system according to the modulation information in the modulation information set; starting the converter in the flexible interconnection system according to the startup mode corresponding to the flexible interconnection system and based on the received startup command, and controlling the operation of the converter in the flexible interconnection system.

[0048] For example, first determine whether the set startup mode (the startup mode used to start the converter in the flexible interconnection system) meets the startup conditions. For example, the controller (corresponding to the above-mentioned main controller) receives the startup mode setting from the monitoring system. If the set startup mode meets the normal startup conditions, the system (corresponding to the above-mentioned flexible interconnection system) is in a startup-allowed state, waiting to receive a sequential control startup instruction (corresponding to the above-mentioned startup command); when the selected startup mode does not meet the startup conditions, the system (corresponding to the above-mentioned flexible interconnection system) is in a startup-prohibited state and gives a recommended startup mode.

[0049] Through the above solution, the flexible interconnection system can be conveniently started and operated according to the pre-set startup mode.

[0050] Optionally, in the control method of the flexible interconnection system provided in the embodiment of the present application, if the converters in the flexible interconnection system include: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect the first AC port, the second converter is used to connect the first AC port and the second AC port, the third converter is used to connect the first AC port and the third AC port, and the fourth converter is used to connect the DC port, then according to the startup mode corresponding to the flexible interconnection system, based on the received startup command, starting the converters in the flexible interconnection system includes: according to the startup mode corresponding to the flexible interconnection system, based on the received startup command, starting the first converter The method comprises the following steps: charging the first converter and charging the second converter when the voltage value of the first converter is equal to the first preset value; charging the third converter when the voltage value of the second converter is equal to the second preset value, and unlocking the first converter when the voltage value of the third converter is equal to the third preset value; after unlocking the first converter, unlocking the second converter, and unlocking the third converter after unlocking the second converter; unlocking the fourth converter after unlocking the third converter, and completing the process of starting the converters in the flexible interconnection system after unlocking the fourth converter.

[0051] For example, Figure 2 is a schematic diagram of the AC / DC hybrid flexible interconnection system topology in this embodiment, such as Figure 2As shown, a hybrid AC / DC flexible interconnection scheme is formed by three AC ports and one DC port, which is suitable for AC / DC friendly access. Among them, CHB (corresponding to the above-mentioned first converter) is connected to AC port 1 (corresponding to the above-mentioned first AC port), and is used to support the voltage of AC port 1. At the same time, its DC side is connected to the power electronic DC transformer, and the DC port is led out; the DC transformer realizes the electrical isolation of the AC and DC ports and the blocking of zero-sequence current; CHB1 (corresponding to the above-mentioned second converter) and CHB2 (corresponding to the above-mentioned third converter) are connected across AC ports 1-2 (corresponding to the above-mentioned first AC port and second AC port) and AC ports 1-3 (corresponding to the above-mentioned first AC port and third AC port), and are used to adjust the flow between AC ports 1-2 (corresponding to the above-mentioned first AC port and second AC port) and 1-3 (corresponding to the above-mentioned first AC port and third AC port). CHB (corresponding to the first converter mentioned above) is the core of the operation of the overall flexible interconnection device. The DC side of CHB (corresponding to the first converter mentioned above) provides a stable DC voltage (corresponding to the DC port mentioned above) for the primary side of DCT (corresponding to the fourth converter mentioned above). At the same time, it generates an intermediate frequency zero-sequence voltage and a zero-sequence current, which pass through CHB1 and C r1 -L r1 and neutral line, CHB2 and C r2 -L r2 and the neutral line form two intermediate frequency loops. r1 -L r1 and C r2 -L r2 The branch replaces the charging resistance branch of CHB1 and CHB2 devices, and combines the control strategy of intermediate frequency resonance control and mixing modulation, which has the advantages of compactness, economy, high efficiency and high power density.

[0052] For example, when the system (corresponding to the above-mentioned flexible interconnection system) is in the start-up permission state, after receiving the sequential control start command, CHB (corresponding to the above-mentioned first converter), CHB1 (corresponding to the above-mentioned second converter), and CHB2 (corresponding to the above-mentioned third converter) are started with one key according to the corresponding start mode. The process is as follows:

[0053] First, charge the module capacitors of CHB (corresponding to the first converter mentioned above), CHB1 (corresponding to the second converter mentioned above), and CHB2 (corresponding to the third converter mentioned above). First, close port 1 to connect switch KM1, charge the capacitor of the CHB power module through the charging resistor, and then enable the controllable charging method to charge the capacitor voltage of the CHB module (corresponding to the first converter mentioned above) to the set value. Then close KM_CHB1 and KM_LC1, and after a delay, charge the capacitor voltage of the CHB1 module (corresponding to the second converter mentioned above) to the set value through the controllable charging method. Then close KM_CHB2 and KM_LC2, and charge the capacitor voltage of the CHB2 module (corresponding to the third converter mentioned above) to the set value in the same way.

[0054] Then unlock CHB (corresponding to the first converter mentioned above). Each control loop of CHB (corresponding to the first converter mentioned above) starts calculation, and the CHB (corresponding to the first converter mentioned above) active control loop, reactive control loop and interphase balancing control loop generate a fundamental modulation wave (50Hz sine wave), and then superimpose the intermediate frequency modulation wave (500Hz square wave) generated by the open loop, and after carrier phase shifting, send it to each power module of CHB to control each power module to unlock and operate. In the unlocking stage, the command values ​​of the CHB active control loop and reactive control loop are both 0, and the intermediate frequency square wave amplitude is generated by the ramp control function. When the intermediate frequency square wave amplitude reaches the set value, CHB unlocking is completed.

[0055] Further unlock CHB1 (corresponding to the above-mentioned second converter). CHB1 (corresponding to the above-mentioned second converter) can be unlocked only after CHB (corresponding to the above-mentioned first converter) is unlocked. The active control loop and reactive control loop of CHB1 (corresponding to the above-mentioned second converter) generate fundamental modulation waves, and the direct voltage control loop generates intermediate frequency modulation waves. When CHB1 (corresponding to the above-mentioned second converter) is unlocked in PQ mode, the active command and reactive command are 0. When unlocked in VF mode, the active loop and reactive loop do not run, the fundamental modulation wave is 0, and only the direct voltage control loop runs.

[0056] Further unlocking CHB2 (corresponding to the third converter mentioned above). The control method of CHB2 (corresponding to the third converter mentioned above) is the same as that of CHB1 (corresponding to the second converter mentioned above).

[0057] Further unlock the DCT (corresponding to the fourth converter mentioned above). After the CHB (corresponding to the first converter mentioned above), CHB1 (corresponding to the second converter mentioned above), and CHB2 (corresponding to the third converter mentioned above) are unlocked according to the set mode, the DCT (corresponding to the fourth converter mentioned above) is unlocked. After judging that the average voltage of the primary module of the DCT (corresponding to the fourth converter mentioned above) reaches the set value and there is no module failure, the primary side is unlocked, and after a delay, when the secondary module voltage reaches the target value, the secondary side is unlocked, and the secondary DC voltage of the DCT (corresponding to the fourth converter mentioned above) is controlled to climb to the target value.

[0058] Through the above solution, the operation of the converter in the flexible interconnection system can be started quickly and accurately.

[0059] Optionally, in the control method of the flexible interconnection system provided in the embodiment of the present application, if the converter in the flexible interconnection system includes: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect the first AC port, the second converter is used to connect the first AC port and the second AC port, the third converter is used to connect the first AC port and the third AC port, and the fourth converter is used to connect the DC port, then through the modulation information in the modulation information set, controlling the operation of the converter in the flexible interconnection system includes: calculating the sum of the power of the second AC port, the power of the third AC port and the power of the DC port to obtain the total power ; Determine whether the total power is greater than the rated power of the first AC port; if the total power is not greater than the rated power of the first AC port, control the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set; if the total power is greater than the rated power of the first AC port, limit the power of the second AC port, the power of the third AC port and the power of the DC port to obtain the limited power, wherein the limiting processing includes reducing the power of the second AC port, the power of the third AC port and the power of the DC port; control the operation of the converter in the flexible interconnection system based on the modulation information in the modulation information set and the limited power.

[0060] For example, the target command is run and the command is limited. After the overall unlocking of the device is completed, the active command, reactive command and voltage command of CHB (corresponding to the first converter), CHB1 (corresponding to the second converter), CHB2 (corresponding to the third converter) and DCT (corresponding to the fourth converter) are all ramped to the target value. The active power output of port 1 (corresponding to the first AC port mentioned above) is the active vector sum (corresponding to the above-mentioned total power) of AC port 2 (corresponding to the above-mentioned second AC port), AC port 3 (corresponding to the above-mentioned third AC port) and DC port (corresponding to the above-mentioned DC port). When the vector sum (corresponding to the above-mentioned total power) exceeds the rated power of port 1 (corresponding to the above-mentioned first AC port), the active power instructions of AC port 2 (corresponding to the above-mentioned second AC port), AC port 3 (corresponding to the above-mentioned third AC port) and DC port (corresponding to the above-mentioned DC port) must be limited synchronously. The limiting method is to reduce the active power instructions of each port in proportion until the vector sum (corresponding to the above-mentioned total power) is equal to the rated power of port 1 (corresponding to the above-mentioned first AC port).

[0061] Through the above solution, the power of the ports in the flexible interconnection system can be limited quickly and accurately.

[0062] Optionally, in the control method of the flexible interconnection system provided in an embodiment of the present application, if the converters in the flexible interconnection system include: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect the first AC port, the second converter is used to connect the first AC port and the second AC port, the third converter is used to connect the first AC port and the third AC port, and the fourth converter is used to connect the DC port, then controlling the operation of the converters in the flexible interconnection system through the modulation information in the modulation information set includes: determining whether there is a faulty converter among the converters in the flexible interconnection system; if there is no faulty converter among the converters in the flexible interconnection system, controlling the operation of the converters in the flexible interconnection system through the modulation information in the modulation information set; if there is a faulty converter among the converters in the flexible interconnection system, processing the faulty converter, and controlling the operation of the converters in the flexible interconnection system based on the processed converter and the modulation information in the modulation information set.

[0063] For example, when the flexible interconnection device (corresponding to the above-mentioned flexible interconnection system) is operating according to the control instruction, if the power unit fault information is received, it is determined whether the power unit bypass condition is met, and the fault module bypass processing and the whole device fault processing are performed.

[0064] Through the above solution, the faulty modules in the flexible interconnection system can be processed quickly and accurately.

[0065] Optionally, in the control method of the flexible interconnection system provided in the embodiment of the present application, if there is a faulty converter among the converters in the flexible interconnection system, processing the faulty converter includes: if a fault occurs in the first converter in the flexible interconnection system, determining whether the number of bypass modules corresponding to the first converter is greater than a first preset number; if the number of bypass modules corresponding to the first converter is not greater than the first preset number, bypassing the target faulty module and bypassing the module in the fourth converter corresponding to the target faulty module, wherein the target faulty module is the faulty module in the first converter; if the number of bypass modules corresponding to the first converter is greater than the first preset number, all of the first converter, the second converter, the third converter and the fourth converter are locked.

[0066] For example, if a CHB power module (corresponding to the first converter mentioned above) fails, if the current number of bypass modules has reached the maximum limit of the number of bypass modules of the CHB (corresponding to the first converter mentioned above), all devices (corresponding to the flexible interconnection system mentioned above) are locked; if the current number of bypass modules is less than the maximum limit of the bypass number, the faulty module is bypassed, and at the same time, the module number of the DCT device (corresponding to the fourth converter mentioned above) connected to the DC side of the faulty module (corresponding to the target faulty module mentioned above) is identified and bypassed, and the number of bypass modules recorded by the CHB (corresponding to the first converter mentioned above) and the DCT (corresponding to the fourth converter mentioned above) is increased by 1.

[0067] Through the above solution, a CHB power module failure in the flexible interconnection system can be quickly and accurately handled.

[0068] Optionally, in the control method of the flexible interconnection system provided in the embodiment of the present application, if there is a faulty converter among the converters in the flexible interconnection system, processing the faulty converter includes: if a second converter in the flexible interconnection system fails, determining whether the number of bypass modules corresponding to the second converter is greater than a second preset number; if the number of bypass modules corresponding to the second converter is not greater than the second preset number, bypassing the faulty module in the second converter, and controlling the second converter to continue operating; if the number of bypass modules corresponding to the second converter is greater than the second preset number, locking the second converter, and controlling the first converter, the third converter and the fourth converter to continue operating.

[0069] For example, if the CHB1 power module (corresponding to the above-mentioned second converter) fails, determine whether the bypass exceeds the limit. If the current number of bypass modules has reached the maximum limit of the CHB1 (corresponding to the above-mentioned second converter), the CHB1 device (corresponding to the above-mentioned second converter), the CHB device (corresponding to the above-mentioned first converter), the CHB2 device (corresponding to the above-mentioned third converter) and the DCT device (corresponding to the above-mentioned fourth converter) are locked to continue to operate; if the current number of bypass modules is less than the maximum limit of the CHB1 (corresponding to the above-mentioned second converter) bypass module number, the faulty module is bypassed, the CHB1 device (corresponding to the above-mentioned second converter) continues to operate, and the number of bypass modules is recorded as 1.

[0070] Through the above solution, a CHB1 power module failure in the flexible interconnection system can be quickly and accurately handled.

[0071] For example, with the increase in the penetration rate of distributed energy, the large-scale access of electric vehicles, and the diversified development of user loads, the operation and dispatch of distribution networks face huge challenges in feeder operation and protection design. Feeder overload and bidirectional power flow are prone to occur, affecting the safe and economic operation of distribution networks. Therefore, flexible interconnection of multiple feeders is one of the important development trends. The flexible interconnection device can realize the rapid and continuous adjustment of active and reactive power within the capacity allowable range of the power electronic converter, fully release the power supply capacity of the existing distribution network, improve the distributed new energy absorption capacity, realize load balancing and flexible power transfer between connected feeders, and has the advantages of modularization and flexible port expansion, which improves the power supply reliability of the medium-voltage distribution network.

[0072] For example, this embodiment provides a control method and device for an AC / DC hybrid flexible interconnection system. By optimizing the system control strategy, the coordinated control strategy and the control strategy of each converter are comprehensively designed, and the high-speed parallel computing of multiple CPUs inside a single device and the reliable internal information transmission network are utilized to implement all control algorithms and protection functions of CHB (corresponding to the above-mentioned first converter), CHB1 (corresponding to the above-mentioned second converter), CHB2 (corresponding to the above-mentioned third converter) and DCT (corresponding to the above-mentioned fourth converter) in a single host, thereby improving the integration and reliability of the overall device.

[0073] For example, Figure 3 is an architecture diagram of a control flexible interconnection system provided according to an embodiment of the present application, such as Figure 3 As shown, a main controller completes the system analog quantity and switch quantity sampling, receives the reference instructions issued by the monitoring system, receives the power module information, implements the core control algorithm, the stable switching of each operating mode and the fault response, generates the modulation information, and sends it to each power module through the optical fiber.

[0074] For example, when the number of modules is too large, or an AC port and inverter device are added, the main controller has insufficient fiber optic interfaces. You can increase the fiber optic interfaces by adding an expansion chassis. However, the expansion chassis does not assume the functions of the above-mentioned main controller. It only expands the fiber optic interface and sends the modulation information generated by the main controller to the corresponding power module.

[0075] For example, Figure 4 is a flow chart of an optional control method of a flexible interconnection system provided in an embodiment of the present application, such as Figure 4 As shown, the control flow of the main controller is as follows:

[0076] First, determine whether the set startup mode meets the startup conditions. This embodiment provides 8 startup modes, which can be selected according to the status of each AC and DC port and the status of the device itself. The controller receives the startup mode setting from the monitoring system. If the set startup mode meets the normal startup conditions, the system is in the startup-allowed state and waits to receive the sequential control startup command; when the selected startup mode does not meet the startup conditions, the system is in the startup-prohibited state and gives a recommended startup mode. The specific description of the startup mode is shown in Table 1:

[0077] Table 1

[0078]

[0079]

[0080] The second step is that the system is in the start-up permission state. After receiving the sequential control start command, CHB (corresponding to the first converter mentioned above), CHB1 (corresponding to the second converter mentioned above), and CHB2 (corresponding to the third converter mentioned above) are started with one key according to the corresponding start mode. The process is as follows:

[0081] First, charge the module capacitors of CHB (corresponding to the first converter mentioned above), CHB1 (corresponding to the second converter mentioned above), and CHB2 (corresponding to the third converter mentioned above). First, close port 1 to connect switch KM1, charge the CHB power module capacitor through the charging resistor, and then enable the controllable charging method to charge the CHB module capacitor voltage to the set value. Then close KM_CHB1 and KM_LC1, and after a delay, charge the CHB1 module capacitor voltage to the set value through the controllable charging method. Then close KM_CHB2 and KM_LC2, and charge the CHB2 module capacitor voltage to the set value in the same way.

[0082] Then unlock CHB (corresponding to the first converter mentioned above). Each control loop of CHB (corresponding to the first converter mentioned above) starts calculation, and the CHB (corresponding to the first converter mentioned above) active control loop, reactive control loop and interphase balancing control loop generate a fundamental modulation wave (50Hz sine wave), and then superimpose the intermediate frequency modulation wave (500Hz square wave) generated by the open loop, and after carrier phase shifting, send it to each power module of CHB to control each power module to unlock and operate. In the unlocking stage, the command values ​​of the CHB active control loop and reactive control loop are both 0, and the intermediate frequency square wave amplitude is generated by the ramp control function. When the intermediate frequency square wave amplitude reaches the set value, CHB unlocking is completed.

[0083] Further unlock CHB1 (corresponding to the above-mentioned second converter). CHB1 (corresponding to the above-mentioned second converter) can be unlocked only after CHB (corresponding to the above-mentioned first converter) is unlocked. The active control loop and reactive control loop of CHB1 generate fundamental modulation waves, and the direct pressure control loop generates intermediate frequency modulation waves. When CHB1 is unlocked in PQ mode, the active command and reactive command are 0. When unlocked in VF mode, the active loop and reactive loop do not run, the fundamental modulation wave is 0, and only the direct pressure control loop runs.

[0084] Further unlocking CHB2 (corresponding to the third converter mentioned above). The control method of CHB2 (corresponding to the third converter mentioned above) is the same as that of CHB1 (corresponding to the second converter mentioned above).

[0085] Further unlock the DCT (corresponding to the fourth converter mentioned above). After CHB (corresponding to the first converter mentioned above), CHB1 (corresponding to the second converter mentioned above), and CHB2 (corresponding to the third converter mentioned above) are unlocked according to the set mode, the DCT (corresponding to the fourth converter mentioned above) is unlocked. After judging that the average voltage of the DCT primary module reaches the set value and there is no module failure, the primary side is unlocked, and a delay is made. When the secondary module voltage reaches the target value, the secondary side is unlocked, and the DCT secondary DC voltage is controlled to climb to the target value.

[0086] The third step is to run to the target command and limit the command. After the overall unlocking of the device is completed, the active command, reactive command and voltage command of CHB (corresponding to the above-mentioned first converter), CHB1 (corresponding to the above-mentioned second converter), CHB2 (corresponding to the above-mentioned third converter) and DCT (corresponding to the above-mentioned fourth converter) all climb to the target value. The active power output of port 1 (corresponding to the above-mentioned first AC port) is the active vector sum (corresponding to the above-mentioned power sum) of AC port 2 (corresponding to the above-mentioned second AC port), AC port 3 (corresponding to the above-mentioned third AC port) and DC port (corresponding to the above-mentioned DC port). When the vector sum (corresponding to the above-mentioned power sum) exceeds the rated power of port 1 (corresponding to the above-mentioned first AC port), the active command of AC port 2 (corresponding to the above-mentioned second AC port), AC port 3 (corresponding to the above-mentioned third AC port) and DC port (corresponding to the above-mentioned DC port) must be limited synchronously. The limiting method is to reduce the active command of each port in proportion to the vector sum equal to the rated power of port 1 (corresponding to the above-mentioned first AC port).

[0087] Step 4: During the operation of the flexible interconnection device (corresponding to the above-mentioned flexible interconnection system) according to the control instruction, if the power unit fault information is received, it is determined whether the power unit bypass condition is met, and the fault module bypass processing and the whole device fault processing are performed. Figure 5 is a flowchart of module fault processing provided in an embodiment of the present application, such as Figure 5 As shown, specifically including:

[0088] If the CHB1 power module (corresponding to the above-mentioned second converter) fails, determine whether the bypass exceeds the limit. If the current number of bypass modules has reached the maximum limit of the CHB1 (corresponding to the above-mentioned second converter), the CHB1 device (corresponding to the above-mentioned second converter), the CHB device (corresponding to the above-mentioned first converter), the CHB2 device (corresponding to the above-mentioned third converter) and the DCT device (corresponding to the above-mentioned fourth converter) are locked to continue running; if the current number of bypass modules is less than the maximum limit of the CHB1 (corresponding to the above-mentioned second converter) bypass module number, the faulty module is bypassed, the CHB1 device (corresponding to the above-mentioned second converter) continues to run, and the number of bypass modules is recorded plus 1.

[0089] The steps for the failure of the CHB2 power module (corresponding to the third converter mentioned above) are the same as those mentioned above.

[0090] If a CHB power module (corresponding to the first converter mentioned above) fails, if the current number of bypass modules has reached the maximum limit of the number of bypass modules of the CHB (corresponding to the first converter mentioned above), all devices (corresponding to the flexible interconnection system mentioned above) are locked; if the current number of bypass modules is less than the maximum limit of the bypass number, the faulty module is bypassed, and at the same time, the module number of the DCT device (corresponding to the fourth converter mentioned above) connected to the DC side of the faulty module is identified and bypassed, and the number of bypass modules recorded by the CHB (corresponding to the first converter mentioned above) and the DCT (corresponding to the fourth converter mentioned above) is increased by 1.

[0091] If the DCT power module (corresponding to the fourth converter) fails, if the current number of bypass modules has reached the maximum limit of the number of bypass modules of the DCT (corresponding to the fourth converter), the DCT device (corresponding to the fourth converter) is locked, and the CHB (corresponding to the first converter) and CHB1 (corresponding to the second converter), CHB2 (corresponding to the third converter) continue to operate in the original mode. If the current number of bypass modules is less than the maximum limit of the bypass number, the faulty module is bypassed, and at the same time, the module number of the CHB device (corresponding to the first converter) connected to the DC side of the faulty module is identified and bypassed, and the number of bypass modules recorded by the CHB (corresponding to the first converter) and the DCT (corresponding to the fourth converter) is increased by 1.

[0092] Therefore, the solution in this embodiment has the following advantages:

[0093] (1) The scheme in this embodiment integrates the coordinated control strategy and the individual converter control strategy, so that a single control device can automatically identify the startup mode and complete the operation control and fault handling of the four converters. All control information transmission is completed inside the main controller, which can improve the stability, compactness and economy of the control device.

[0094] (2) The same controller is used to implement partitioned control and management of all modules, so that coupled power modules can be synchronously bypassed when a fault occurs, avoiding the risk of coupled module bypass asynchrony caused by transmission delay, which in turn causes the risk of whole machine failure, thereby improving the reliability of the overall device.

[0095] Moreover, compared with the prior art, the prior art adopts a double-layer controller structure, and the co-control device executes the coordinated control strategy, generates the start and stop signals of each converter, the control mode and the operating power, etc., and transmits these signals to the control and protection device of each converter, and each control and protection device completes its own independent control strategy and protection function. The scheme in this embodiment integrates the coordinated control strategy and the control and protection functions of each converter into a main controller, all information is transmitted within the device, and the rapidity of the information interaction of the power module is improved, which is conducive to the synchronous control of the module and realizes the compact and economical design of the equipment.

[0096] In summary, the control method of the flexible interconnected system provided in the embodiment of the present application receives a control instruction for controlling the flexible interconnected system through a main controller, wherein the flexible interconnected system is used to control the operating status of equipment in a distribution network; according to the control instruction, the electrical status information of each power module of the converter in the flexible interconnected system is obtained, wherein the electrical status information of each power module includes at least: voltage information, current information and switch information of a target switch, and the target switch is a switch in each power module; based on the electrical status information of each power module of the converter in the flexible interconnected system, modulation information corresponding to each power module is generated to obtain a modulation information set; each modulation information in the modulation information set is sent to its corresponding power module, and the operation of the converter in the flexible interconnected system is controlled through the modulation information in the modulation information set, thereby solving the problem of poor effect of controlling the operation of each converter in the flexible interconnected system in the related art. A main controller is used to complete the system analog quantity and switch quantity sampling, receive the reference instructions (i.e. control instructions) issued by the monitoring system, receive the power module information (i.e. the electrical status information of each power module), implement the core control algorithm, the stable switching of each operating mode and the fault response, generate modulation information, and then send the modulation information generated by the main controller to the corresponding power module through optical fiber, so as to integrate the coordinated control strategy and the control and protection functions of each converter into a main controller. All information is transmitted within the device, which improves the rapidity of power module information interaction, is beneficial to the synchronous control of the modules, and improves the stability, compactness and economy of the control device, thereby improving the effect of controlling the operation of each converter in the flexible interconnection system.

[0097] 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.

[0098] The embodiment of the present application also provides a control device for a flexible interconnection system. It should be noted that the control device for a flexible interconnection system in the embodiment of the present application can be used to execute the control method for a flexible interconnection system provided in the embodiment of the present application. The control device for a flexible interconnection system provided in the embodiment of the present application is introduced below.

[0099] Figure 6 Schematic diagram of a control device of a flexible interconnection system provided according to an embodiment of the present application. Figure 6 As shown, the device includes: a first receiving unit 601, a first acquiring unit 602, a first generating unit 603 and a first processing unit 604.

[0100] Specifically, the first receiving unit 601 is used to receive a control instruction for controlling the flexible interconnection system through the main controller, wherein the flexible interconnection system is used to control the operating state of the equipment in the distribution network;

[0101] A first acquisition unit 602 is used to acquire electrical state information of each power module of the converter in the flexible interconnection system according to the control instruction, wherein the electrical state information of each power module at least includes: voltage information, current information and switch information of a target switch, where the target switch is a switch in each power module;

[0102] A first generating unit 603 is used to generate modulation information corresponding to each power module based on the electrical state information of each power module of the converter in the flexible interconnection system to obtain a modulation information set;

[0103] The first processing unit 604 is used to send each modulation information in the modulation information set to its corresponding power module, and control the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set.

[0104] In summary, the control device of the flexible interconnection system provided in the embodiment of the present application receives a control instruction for controlling the flexible interconnection system through the main controller through the first receiving unit 601, wherein the flexible interconnection system is used to control the operating status of the equipment in the distribution network; the first acquisition unit 602 acquires the electrical status information of each power module of the converter in the flexible interconnection system according to the control instruction, wherein the electrical status information of each power module includes at least: voltage information, current information and switch information of the target switch, and the target switch is the switch in each power module; the first generation unit 603 generates modulation information corresponding to each power module based on the electrical status information of each power module of the converter in the flexible interconnection system to obtain a modulation information set; the first processing unit 604 sends each modulation information in the modulation information set to its corresponding power module, and controls the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set, thereby solving the problem of poor effect of controlling the operation of each converter in the flexible interconnection system in the related art. A main controller is used to complete the system analog quantity and switch quantity sampling, receive the reference instructions (i.e. control instructions) issued by the monitoring system, receive the power module information (i.e. the electrical status information of each power module), implement the core control algorithm, the stable switching of each operating mode and the fault response, generate modulation information, and then send the modulation information generated by the main controller to the corresponding power module through optical fiber, so as to integrate the coordinated control strategy and the control and protection functions of each converter into a main controller. All information is transmitted within the device, which improves the rapidity of power module information interaction, is beneficial to the synchronous control of the modules, and improves the stability, compactness and economy of the control device, thereby improving the effect of controlling the operation of each converter in the flexible interconnection system.

[0105] Optionally, in the control device of the flexible interconnection system provided in the embodiment of the present application, the first processing unit includes: a first judgment module, used to judge whether the flexible interconnection system is in a state where startup is allowed; a first processing module, used to prohibit the flexible interconnection system from being started if the flexible interconnection system is in a state where startup is prohibited; a first determination module, used to determine the startup mode corresponding to the flexible interconnection system according to the modulation information in the modulation information set if the flexible interconnection system is in a state where startup is allowed; and a second processing module, used to start the converter in the flexible interconnection system according to the startup mode corresponding to the flexible interconnection system and based on the received startup command, and control the operation of the converter in the flexible interconnection system.

[0106] Optionally, in the control device of the flexible interconnection system provided in the embodiment of the present application, if the converters in the flexible interconnection system include: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect the first AC port, the second converter is used to connect the first AC port and the second AC port, the third converter is used to connect the first AC port and the third AC port, and the fourth converter is used to connect the DC port, then the second processing module includes: a first charging submodule, which is used to charge the first converter based on the received startup command according to the startup mode corresponding to the flexible interconnection system, and when the voltage value of the first converter is equal to the first preset value , charging the second converter; the first processing submodule, used for charging the third converter when the voltage value of the second converter is equal to the second preset value, and unlocking the first converter when the voltage value of the third converter is equal to the third preset value; the second processing submodule, used for unlocking the second converter after the first converter is unlocked, and unlocking the third converter after the second converter is unlocked; the third processing submodule, used for unlocking the fourth converter after the third converter is unlocked, and completing the process of starting the converters in the flexible interconnection system after the fourth converter is unlocked.

[0107] Optionally, in the control device of the flexible interconnection system provided in the embodiment of the present application, if the converters in the flexible interconnection system include: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect the first AC port, the second converter is used to connect the first AC port and the second AC port, the third converter is used to connect the first AC port and the third AC port, and the fourth converter is used to connect the DC port, then the first processing unit includes: a first calculation module, which is used to calculate the sum of the power of the second AC port, the power of the third AC port and the power of the DC port to obtain the total power; and a second judgment module, which is used to judge whether the total power is greater than the power of the first AC port. The first control module is used to control the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set if the total power is not greater than the rated power of the first AC port; the third processing module is used to limit the power of the second AC port, the power of the third AC port and the power of the DC port if the total power is greater than the rated power of the first AC port to obtain the limited power, wherein the limiting processing includes reducing the power of the second AC port, the power of the third AC port and the power of the DC port; the second control module is used to control the operation of the converter in the flexible interconnection system according to the modulation information in the modulation information set and the limited power.

[0108] Optionally, in the control device of the flexible interconnection system provided in the embodiment of the present application, if the converters in the flexible interconnection system include: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect the first AC port, the second converter is used to connect the first AC port and the second AC port, the third converter is used to connect the first AC port and the third AC port, and the fourth converter is used to connect the DC port, then the first processing unit includes: a third judgment module, used to judge whether there is a faulty converter in the converters in the flexible interconnection system; a third control module, used to control the operation of the converters in the flexible interconnection system through modulation information in a modulation information set if there is no faulty converter in the converters in the flexible interconnection system; a fourth processing module, used to process the faulty converter if there is a faulty converter in the converters in the flexible interconnection system, and control the operation of the converters in the flexible interconnection system based on the processed converter and the modulation information in the modulation information set.

[0109] Optionally, in the control device of the flexible interconnection system provided in the embodiment of the present application, the fourth processing module includes: a first judgment submodule, which is used to determine whether the number of bypass modules corresponding to the first converter in the flexible interconnection system is greater than a first preset number if a fault occurs in the first converter; a fourth processing submodule, which is used to bypass the target fault module if the number of bypass modules corresponding to the first converter is not greater than the first preset number, and bypass the module in the fourth converter corresponding to the target fault module, wherein the target fault module is the fault module in the first converter; and a fifth processing submodule, which is used to lock all the first converter, the second converter, the third converter and the fourth converter if the number of bypass modules corresponding to the first converter is greater than the first preset number.

[0110] Optionally, in the control device of the flexible interconnection system provided in the embodiment of the present application, the fourth processing module includes: a second judgment submodule, which is used to determine whether the number of bypass modules corresponding to the second converter is greater than a second preset number if a fault occurs in the second converter in the flexible interconnection system; a sixth processing submodule, which is used to bypass the faulty module in the second converter and control the second converter to continue operating if the number of bypass modules corresponding to the second converter is not greater than the second preset number; and a seventh processing submodule, which is used to lock the second converter and control the first converter, the third converter and the fourth converter to continue operating if the number of bypass modules corresponding to the second converter is greater than the second preset number.

[0111] The control device of the flexible interconnection system includes a processor and a memory. The above-mentioned first receiving unit 601, first acquisition unit 602, first generation unit 603 and first processing unit 604 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.

[0112] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be set, and the effect of controlling the operation of each converter in the flexible interconnection system can be improved by adjusting the kernel parameters.

[0113] 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.

[0114] 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 control method of the flexible interconnection system is implemented.

[0115] An embodiment of the present invention provides a processor, which is used to run a program, wherein the control method of the flexible interconnection system is executed when the program is run.

[0116] like Figure 7 As 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: receiving a control instruction for controlling a flexible interconnection system through a main controller, wherein the flexible interconnection system is used to control the operating state of equipment in a distribution network; obtaining electrical state information of each power module of a converter in the flexible interconnection system according to the control instruction, wherein the electrical state information of each power module includes at least: voltage information, current information, and switch information of a target switch, and the target switch is a switch in each power module; based on the electrical state information of each power module of the converter in the flexible interconnection system, generating modulation information corresponding to each power module to obtain a modulation information set; sending each modulation information in the modulation information set to its corresponding power module, and controlling the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set.

[0117] When the processor executes the program, the following steps are also implemented: controlling the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set includes: judging whether the flexible interconnection system is in a state where startup is allowed; if the flexible interconnection system is in a state where startup is prohibited, prohibiting the flexible interconnection system from being started; if the flexible interconnection system is in a state where startup is allowed, determining the startup mode corresponding to the flexible interconnection system according to the modulation information in the modulation information set; starting the converter in the flexible interconnection system according to the startup mode corresponding to the flexible interconnection system and based on the received startup command, and controlling the operation of the converter in the flexible interconnection system.

[0118] When the processor executes the program, the following steps are also implemented: if the converters in the flexible interconnection system include: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect the first AC port, the second converter is used to connect the first AC port and the second AC port, the third converter is used to connect the first AC port and the third AC port, and the fourth converter is used to connect the DC port, then according to the startup mode corresponding to the flexible interconnection system, based on the received startup command, starting the converters in the flexible interconnection system includes: according to the startup mode corresponding to the flexible interconnection system, based on the received startup command, charging the first converter, and When the voltage value of the first converter is equal to the first preset value, the second converter is charged; when the voltage value of the second converter is equal to the second preset value, the third converter is charged, and when the voltage value of the third converter is equal to the third preset value, the first converter is unlocked; after the first converter is unlocked, the second converter is unlocked, and after the second converter is unlocked, the third converter is unlocked; after the third converter is unlocked, the fourth converter is unlocked, and after the fourth converter is unlocked, the process of starting the converters in the flexible interconnection system is completed.

[0119] When the processor executes the program, the following steps are also implemented: if the converter in the flexible interconnection system includes: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect the first AC port, the second converter is used to connect the first AC port and the second AC port, the third converter is used to connect the first AC port and the third AC port, and the fourth converter is used to connect the DC port, then controlling the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set includes: calculating the sum of the power of the second AC port, the power of the third AC port and the power of the DC port to obtain the total power; judging the total power and whether it is greater than the rated power of the first AC port; if the total power is not greater than the rated power of the first AC port, the operation of the converter in the flexible interconnection system is controlled by the modulation information in the modulation information set; if the total power is greater than the rated power of the first AC port, the power of the second AC port, the power of the third AC port and the power of the DC port are limited to obtain the limited power, wherein the limiting processing includes reducing the power of the second AC port, the power of the third AC port and the power of the DC port; the operation of the converter in the flexible interconnection system is controlled according to the modulation information in the modulation information set and the limited power.

[0120] When the processor executes the program, the following steps are also implemented: if the converters in the flexible interconnection system include: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect the first AC port, the second converter is used to connect the first AC port and the second AC port, the third converter is used to connect the first AC port and the third AC port, and the fourth converter is used to connect the DC port, then controlling the operation of the converters in the flexible interconnection system through the modulation information in the modulation information set includes: judging whether there is a faulty converter in the converters in the flexible interconnection system; if there is no faulty converter in the converters in the flexible interconnection system, controlling the operation of the converters in the flexible interconnection system through the modulation information in the modulation information set; if there is a faulty converter in the converters in the flexible interconnection system, processing the faulty converter, and controlling the operation of the converters in the flexible interconnection system based on the processed converter and the modulation information in the modulation information set.

[0121] When the processor executes the program, the following steps are also implemented: if there is a faulty converter among the converters in the flexible interconnection system, processing the faulty converter includes: if a first converter in the flexible interconnection system fails, determining whether the number of bypass modules corresponding to the first converter is greater than a first preset number; if the number of bypass modules corresponding to the first converter is not greater than the first preset number, bypassing the target faulty module, and bypassing the module corresponding to the target faulty module in the fourth converter, wherein the target faulty module is the faulty module in the first converter; if the number of bypass modules corresponding to the first converter is greater than the first preset number, all of the first converter, the second converter, the third converter and the fourth converter are locked.

[0122] When the processor executes the program, the following steps are also implemented: if there is a faulty converter among the converters in the flexible interconnection system, processing the faulty converter includes: if a second converter in the flexible interconnection system fails, determining whether the number of bypass modules corresponding to the second converter is greater than a second preset number; if the number of bypass modules corresponding to the second converter is not greater than the second preset number, bypassing the faulty module in the second converter, and controlling the second converter to continue to operate; if the number of bypass modules corresponding to the second converter is greater than the second preset number, locking the second converter, and controlling the first converter, the third converter, and the fourth converter to continue to operate.

[0123] The devices in this article can be servers, PCs, PADs, mobile phones, etc.

[0124] 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: receiving a control instruction for controlling a flexible interconnection system through a main controller, wherein the flexible interconnection system is used to control the operating status of equipment in a distribution network; obtaining electrical status information of each power module of a converter in the flexible interconnection system according to the control instruction, wherein the electrical status information of each power module includes at least: voltage information, current information and switch information of a target switch, and the target switch is a switch in each power module; based on the electrical status information of each power module of the converter in the flexible interconnection system, generating modulation information corresponding to each power module to obtain a modulation information set; sending each modulation information in the modulation information set to its corresponding power module, and controlling the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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 control method for a flexible interconnection system, characterized in that: include: Receiving, through a main controller, a control instruction for controlling a flexible interconnection system, wherein the flexible interconnection system is used to control an operating state of a device in a power distribution network; According to the control instruction, the electrical state information of each power module of the converter in the flexible interconnection system is obtained, wherein the electrical state information of each power module at least includes: voltage information, current information and switch information of a target switch, and the target switch is a switch in each power module; Based on the electrical state information of each power module of the converter in the flexible interconnection system, modulation information corresponding to each power module is generated to obtain a modulation information set; Each piece of modulation information in the modulation information set is sent to its corresponding power module, and the operation of the converter in the flexible interconnection system is controlled by the modulation information in the modulation information set.

2. The method according to claim 1, characterized in that Controlling the operation of the converter in the flexible interconnection system by using the modulation information in the modulation information set includes: Determining whether the flexible interconnection system is in a state allowing startup; If the flexible interconnection system is in a startup-prohibited state, prohibiting startup of the flexible interconnection system; If the flexible interconnection system is in a state where startup is allowed, determining a startup mode corresponding to the flexible interconnection system according to the modulation information in the modulation information set; According to the startup mode corresponding to the flexible interconnection system and based on the received startup command, the converter in the flexible interconnection system is started, and the operation of the converter in the flexible interconnection system is controlled.

3. The method according to claim 2, characterized in that If the converters in the flexible interconnection system include: a first converter, a second converter, a third converter, and a fourth converter, the first converter is used to connect a first AC port, the second converter is used to connect the first AC port and a second AC port, the third converter is used to connect the first AC port and a third AC port, and the fourth converter is used to connect a DC port, then according to the startup mode corresponding to the flexible interconnection system and based on the received startup command, starting the converters in the flexible interconnection system includes: According to the startup mode corresponding to the flexible interconnection system, based on the received startup command, the first converter is charged, and when the voltage value of the first converter is equal to a first preset value, the second converter is charged; When the voltage value of the second converter is equal to a second preset value, the third converter is charged, and when the voltage value of the third converter is equal to a third preset value, the first converter is unlocked; After the first converter is unlocked, the second converter is unlocked, and after the second converter is unlocked, the third converter is unlocked; After the third converter is unlocked, the fourth converter is unlocked, and after the fourth converter is unlocked, the process of starting the converters in the flexible interconnection system is completed.

4. The method according to claim 1, characterized in that: If the converters in the flexible interconnection system include: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect a first AC port, the second converter is used to connect the first AC port and a second AC port, the third converter is used to connect the first AC port and a third AC port, and the fourth converter is used to connect a DC port, then controlling the operation of the converters in the flexible interconnection system through the modulation information in the modulation information set includes: Calculating the sum of the power of the second AC port, the power of the third AC port, and the power of the DC port to obtain a total power; Determining whether the total power is greater than the rated power of the first AC port; If the total power is not greater than the rated power of the first AC port, controlling the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set; If the total power is greater than the rated power of the first AC port, the power of the second AC port, the power of the third AC port and the power of the DC port are limited to obtain the limited power, wherein the limiting process includes reducing the power of the second AC port, the power of the third AC port and the power of the DC port; The operation of the converter in the flexible interconnection system is controlled according to the modulation information in the modulation information set and the limited power.

5. The method according to claim 1, characterized in that If the converters in the flexible interconnection system include: a first converter, a second converter, a third converter and a fourth converter, the first converter is used to connect a first AC port, the second converter is used to connect the first AC port and a second AC port, the third converter is used to connect the first AC port and a third AC port, and the fourth converter is used to connect a DC port, then controlling the operation of the converters in the flexible interconnection system through the modulation information in the modulation information set includes: Determining whether there is a faulty converter among the converters in the flexible interconnection system; If there is no faulty converter in the flexible interconnection system, controlling the operation of the converters in the flexible interconnection system by using the modulation information in the modulation information set; If there is a faulty converter among the converters in the flexible interconnection system, the faulty converter is processed, and based on the processed converter and the modulation information in the modulation information set, the operation of the converter in the flexible interconnection system is controlled.

6. The method according to claim 5, characterized in that If there is a faulty converter among the converters in the flexible interconnection system, processing the faulty converter includes: If a first converter in the flexible interconnection system fails, determining whether the number of bypass modules corresponding to the first converter is greater than a first preset number; If the number of bypass modules corresponding to the first converter is not greater than the first preset number, bypassing the target faulty module, and bypassing the module corresponding to the target faulty module in the fourth converter, wherein the target faulty module is the faulty module in the first converter; If the number of bypass modules corresponding to the first converter is greater than the first preset number, the first converter, the second converter, the third converter and the fourth converter are all locked.

7. The method according to claim 5, characterized in that If there is a faulty converter among the converters in the flexible interconnection system, processing the faulty converter includes: If a second converter in the flexible interconnection system fails, determining whether the number of bypass modules corresponding to the second converter is greater than a second preset number; If the number of bypass modules corresponding to the second converter is not greater than the second preset number, bypassing the faulty module in the second converter and controlling the second converter to continue operating; If the number of bypass modules corresponding to the second converter is greater than the second preset number, the second converter is locked, and the first converter, the third converter and the fourth converter are controlled to continue to operate.

8. A control device for a flexible interconnection system, characterized in that: include: A first receiving unit, configured to receive, through a main controller, a control instruction for controlling a flexible interconnection system, wherein the flexible interconnection system is configured to control an operating state of a device in a distribution network; a first acquisition unit, configured to acquire electrical status information of each power module of the converter in the flexible interconnection system according to the control instruction, wherein the electrical status information of each power module at least includes: voltage information, current information, and switch information of a target switch, wherein the target switch is a switch in each power module; A first generating unit, configured to generate modulation information corresponding to each power module based on electrical state information of each power module of the converter in the flexible interconnection system, to obtain a modulation information set; The first processing unit is used to send each modulation information in the modulation information set to its corresponding power module, and control the operation of the converter in the flexible interconnection system through the modulation information in the modulation information set.

9. A computer-readable storage medium, characterized in that: The storage medium stores a program, wherein the program executes the control method of the flexible interconnection system 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 control method of the flexible interconnection system described in any one of claims 1 to 7.

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