A direct-current transformer dynamic hot backup redundancy switching control method and device

Abstract

The application discloses a kind of DC transformer dynamic hot standby redundancy switching control method and device, wherein method includes: obtaining the actual detection voltage of operating power module in current detection period, obtain the difference between its actual detection voltage and module rated voltage;Difference absolute value is sorted, the operating power module of third preset quantity of difference absolute value maximum is obtained, third preset quantity is equal to the smaller of the value in first preset quantity and second preset quantity;Corresponding operating power module is exited from running state and put into hot standby state with third preset quantity of difference absolute value maximum, and corresponding hot standby power module is obtained and put into running state simultaneously.By voltage detection to operating power module, the operating power module corresponding to the maximum absolute value of the difference between module rated voltage is obtained, and it is exchanged with the same number of hot standby power module, to reduce the impact current of high-voltage side and low-voltage side when module bypass instant.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of direct current power distribution control, in particular to a dynamic hot standby redundancy switching control method and device for a direct current transformer. BACKGROUND

[0002] The direct current transformer device can realize direct current transformation, bidirectional power flexible transmission, electrical isolation and other functions, and is a key equipment of a direct current power distribution network. The bidirectional LLC resonant type direct current transformer based on the ISOP structure is generally composed of a plurality of power sub-modules in series on the input side and in parallel on the output side, and has become a general technical solution.

[0003] The redundancy control function is a key technology for the study of the direct current transformer device, that is, when an abnormality occurs in a certain power module of the direct current transformer, the fault module should be automatically bypassed, without affecting the overall operation of the device, and therefore the redundancy control characteristic directly relates to the safe and reliable operation of the direct current transformer device.

[0004] The existing technology currently uses fixed sub-modules as hot standby sub-modules, and when a fault sub-module is detected by the system, the fault sub-module is quickly bypassed and the hot standby sub-module is put into operation, but this method has the problem that the large voltage difference between the fault sub-module and the hot standby sub-module causes a large impact current on the high voltage side and the low voltage side at the moment of bypassing the fault sub-module. If multiple sub-modules fail at the same time (not more than the number of redundant sub-modules), the protection of the direct current transformer device will act and the device will exit operation.

[0005] Therefore, under the condition of ensuring the normal operation of the direct current transformer device, how to suppress the impact current on the high voltage side and the low voltage side at the moment of bypassing the fault sub-module has become an important issue in this field. SUMMARY

[0006] The purpose of the embodiment of the present application is to provide a dynamic hot standby redundancy switching control method and device for a direct current transformer, which acquires a plurality of operating power modules with the largest absolute value of the difference from the rated voltage of the modules by detecting the voltage of the plurality of operating power modules, and exchanges the plurality of operating power modules with the same number of hot standby power modules, so as to reduce the impact current on the high voltage side and the low voltage side at the moment of bypassing the operating power module when a fault occurs.

[0007] To solve the above technical problems, a first aspect of the embodiment of the present application provides a dynamic hot standby redundancy switching control method for a direct current transformer, the direct current transformer comprising a first predetermined number of operating power modules and a second predetermined number of hot standby power modules, comprising the following steps:

[0008] acquire actual detection voltages of the first preset number of the running power modules in a current detection period, to obtain running voltage difference values of the actual detection voltages of the first preset number of the running power modules and module rated voltages;

[0009] sort absolute values of the running voltage difference values, to obtain the running power modules with maximum absolute values of the running voltage difference values in a third preset number, the third preset number being equal to a smaller one of the first preset number and the second preset number;

[0010] exit the running power modules corresponding to the maximum absolute values of the running voltage difference values from a running state and put them into a hot standby state, and acquire the third preset number of the hot standby power modules and put them into the running state.

[0011] Further, the acquiring of the third preset number of the hot standby power modules and the putting of them into the running state include:

[0012] acquire actual detection voltages of the second preset number of the hot standby power modules, to obtain hot standby voltage difference values of the actual detection voltages of the second preset number of the hot standby power modules and the module rated voltages;

[0013] sort absolute values of a plurality of the hot standby voltage difference values, to obtain the hot standby power modules with minimum absolute values of the difference values in the third preset number;

[0014] put the third preset number of the hot standby power modules into the running state.

[0015] Further, before the acquiring of the actual detection voltages of the first preset number of the running power modules in the current detection period, the method further includes:

[0016] acquire state information of the first preset number of the running power modules;

[0017] determine whether a number of the running power modules that have failed is less than or equal to the second preset number;

[0018] if at least one of the running power modules has failed and a number of the failed running power modules is less than or equal to the second preset number, bypass the running power modules that have failed, put the corresponding number of the hot standby power modules into the running state, and synchronously switch a phase shift angle;

[0019] if at least one of the running power modules has failed and a number of the failed running power modules is greater than the second preset number, control the direct-current transformer to stop running.

[0020] Further, the phase shift angle α is:

[0021]

[0022] wherein, N1 is the first preset number, and i is the serial number of the operating power module in failure.

[0023] Further, after the actual detection voltage of the first preset number of operating power modules in the current detection period is obtained, the method further comprises:

[0024] storing the actual detection voltage of the first preset number of operating power modules obtained in the current detection period.

[0025] Correspondingly, a second aspect of the embodiment of the application provides a DC transformer dynamic hot standby redundancy switching control device, the DC transformer comprising: a first preset number of operating power modules and a second preset number of hot standby power modules, comprising:

[0026] a first obtaining module configured to obtain actual detection voltage of the first preset number of operating power modules in a current detection period, to obtain operating voltage difference between the actual detection voltage of the first preset number of operating power modules and module rated voltage;

[0027] a sorting module configured to sort absolute values of the operating voltage difference, to obtain the operating power module with the largest absolute value of the operating voltage difference in a third preset number, the third preset number being equal to the smaller one of the first preset number and the second preset number;

[0028] a first control module configured to exit the operating state and enter the hot standby state of the operating power module corresponding to the largest absolute value of the operating voltage difference in the third preset number, and to obtain the hot standby power module in the third preset number and put it into the operating state.

[0029] Further, the first control module comprises:

[0030] an obtaining unit configured to obtain actual detection voltage of the second preset number of hot standby power modules, to obtain hot standby voltage difference between the actual detection voltage of the second preset number of hot standby power modules and the module rated voltage;

[0031] a sorting unit configured to sort absolute values of a plurality of the hot standby voltage difference, to obtain the hot standby power module with the smallest absolute value of the difference in the third preset number;

[0032] a control unit configured to put the hot standby power module in the third preset number into the operating state.

[0033] Further, the direct-current transformer dynamic hot standby redundancy switching control device further comprises:

[0034] A second acquisition module is configured to acquire state information of the first preset number of operating power modules.

[0035] A judgment module is configured to judge whether the number of operating power modules that have failed is less than or equal to the second preset number.

[0036] A second control module is configured to bypass the operating power modules that have failed, put the corresponding number of hot standby power modules into operation, and synchronously switch the phase shift angle when at least one operating power module has failed and the number of failed operating power modules is less than or equal to the second preset number.

[0037] The second control module is configured to control the direct-current transformer to stop operating when at least one operating power module has failed and the number of failed operating power modules is greater than the second preset number.

[0038] Further, the phase shift angle α is:

[0039]

[0040] wherein N1 is the first preset number, and i is the serial number of the operating power module that has failed.

[0041] Further, the direct-current transformer dynamic hot standby redundancy switching control device further comprises:

[0042] A storage module is configured to store the actual detection voltage of the first preset number of operating power modules acquired in the current detection period.

[0043] Correspondingly, a third aspect of the embodiment of the present application provides an electronic device, comprising: at least one processor; and a memory connected with the at least one processor; wherein the memory stores instructions executable by the one processor, and the instructions are executed by the one processor to enable the at least one processor to execute the above-mentioned direct-current transformer dynamic hot standby redundancy switching control method.

[0044] Correspondingly, a fourth aspect of the embodiment of the present application provides a computer readable storage medium, which stores computer instructions, and the instructions are executed by a processor to implement the above-mentioned direct-current transformer dynamic hot standby redundancy switching control method.

[0045] The above-mentioned technical solutions of the embodiment of the present application have the following beneficial technical effects:

[0046] By performing voltage detection on several operating power modules, several operating power modules with the largest absolute value of difference from the module rated voltage are obtained, and they are swapped with the same number of hot standby power modules to reduce the impact current on the high-voltage and low-voltage sides of the operating power modules when they are bypassed in the event of a fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a schematic diagram of the principle of a DC transformer provided by an embodiment of the present invention;

[0048] Figure 2 This is a flow chart of a method for controlling dynamic hot standby redundancy switching of a DC transformer provided by an embodiment of the present invention;

[0049] Figure 3 This is a schematic diagram of the high-voltage side current test of the original redundant switching control of the DC transformer in the prior art;

[0050] Figure 4 This is a schematic diagram of a high-voltage side current test of a DC transformer dynamic hot standby redundant switching control provided by an embodiment of the present invention;

[0051] Figure 5 This is a block diagram of a DC transformer dynamic hot standby redundant switching control device provided by an embodiment of the present invention;

[0052] Figure 6 This is a schematic diagram of a first control module provided by an embodiment of the present invention.

[0053] Reference numerals:

[0054] 1. First acquisition module, 2. Sorting module, 3. First control module, 4. Second acquisition module, 5. Judgment module, 6. Second control module, 7. Storage module. DETAILED DESCRIPTION

[0055] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0056] Figure 1 This is a schematic diagram of the principle of a DC transformer provided by an embodiment of the present invention.

[0057] Figure 2 This is a flow chart of a method for controlling dynamic hot standby redundancy switching of a DC transformer provided by an embodiment of the present invention.

[0058] Please refer to Figure 1 and Figure 2The first aspect of the embodiment of the present application provides a DC transformer dynamic hot standby redundancy switching control method, the DC transformer comprising: a first preset number of running power modules and a second preset number of hot standby power modules, comprising the following steps:

[0059] S200, acquiring actual detection voltages of the first preset number of running power modules in a current detection period, to obtain running voltage difference values of the actual detection voltages of the first preset number of running power modules and module rated voltages.

[0060] S400, sorting absolute values of the running voltage difference values, to obtain a third preset number of running power modules with maximum running voltage difference absolute values, the third preset number being equal to a smaller one of the first preset number and the second preset number.

[0061] S600, exiting a running state of a running power module corresponding to the third preset number of running power modules with maximum running voltage difference absolute values and putting the running power module into a hot standby state, and simultaneously acquiring the third preset number of hot standby power modules and putting the hot standby power modules into the running state.

[0062] The DC converter is a bidirectional LLC resonant topology of ISOP structure, wherein a Buck-Boost circuit is used in the front stage, wherein an upper tube of the Buck-Boost circuit in the hot standby power module is always in an off state, a lower tube is always in an on state, and a bidirectional LLC resonant circuit is controlled in a normal open-loop and fixed-frequency mode.

[0063] The DC transformer dynamic hot standby redundancy switching control method acquires a number of running power modules with maximum absolute values of voltage difference values from a number of running power modules through voltage detection, and exchanges the running power modules with a same number of hot standby power modules, so as to reduce impact current of high-voltage and low-voltage sides of the running power module bypass instantaneously when a fault occurs.

[0064] Optionally, the first preset number is greater than the second preset number. Generally, from the perspective of reducing equipment cost, the number of hot standby power modules in the hot standby state is much smaller than the number of running power modules in the running state. However, in order to ensure stability of system operation, the number of hot standby power modules in the hot standby state can be equal to or greater than the number of running power modules in the running state.

[0065] Further, when the first preset number of values is greater than the second preset number of values, in each detection period, the third preset number of operating power modules with the largest voltage difference absolute value from the rated module voltage in the operating state are switched from the operating state to the hot standby state, and the third preset number of values can be equal to the second preset number, that is, all the hot standby power modules are put into the operating state in each detection period, and the corresponding number of operating power modules with the largest voltage difference absolute value are exited and put into the hot standby state; similarly, the third preset number of values can also be less than the second preset number, that is, a part of the hot standby power modules are put into the operating state in each detection period, and the same number of operating power modules with the largest voltage difference absolute value are exited and put into the hot standby state.

[0066] Specifically, the step of obtaining the third preset number of hot standby power modules and putting them into the operating state in step S600 can further include the following steps:

[0067] S610, obtaining the actual detection voltage of the second preset number of hot standby power modules, to obtain the hot standby voltage difference between the actual detection voltage of the second preset number of hot standby power modules and the module rated voltage.

[0068] S620, sorting the absolute values of a plurality of hot standby voltage differences to obtain the third preset number of hot standby power modules with the smallest difference absolute value.

[0069] S630, putting the third preset number of hot standby power modules into the operating state.

[0070] Further, before obtaining the actual detection voltage of the first preset number of operating power modules in the current detection period, the following steps are further included:

[0071] S110, obtaining the state information of the first preset number of operating power modules;

[0072] S120, judging whether the number of operating power modules that have failed is less than or equal to the second preset number;

[0073] S130, if at least one operating power module has failed and the number of failures is less than or equal to the second preset number, bypassing the operating power modules that have failed, simultaneously putting the corresponding number of hot standby power modules, and synchronously switching the phase shift angle;

[0074] S140, if at least one operating power module has failed and the number of failures is greater than the second preset number, controlling the direct-current transformer to stop operating.

[0075] When the hot standby power module is selected and put into the running state, the hot standby power module with a smaller voltage difference from the rated module voltage is selected to be put into the hot standby, and the hot standby power module with a larger voltage difference is kept in the hot standby state.

[0076] Further, the phase shift angle α is:

[0077]

[0078] Wherein, N1 is the first preset number, and i is the serial number of the running power module that appears to be faulty.

[0079] Further, after the actual detection voltage of the first preset number of running power modules in the current detection period is obtained in step S200, the method further comprises the following steps:

[0080] S300, storing the actual detection voltage of the first preset number of running power modules obtained in the current detection period.

[0081] The storage of the actual detection voltage of the running power module also stores the storage of the actual detection voltage of the hot standby power module. Through statistical analysis of the two types of stored historical data, the running state of each running power module and each hot standby power module is periodically counted and analyzed, and the running state data report of each power module is obtained, so that the running state of the DC transformer can be predicted in advance in time, and replacement after problems occur is avoided, thereby improving the safety and stability of the system operation.

[0082] Figure 3 is a schematic diagram of the high-voltage side current test of the existing redundant switching control of the DC transformer.

[0083] Figure 4 is a schematic diagram of the high-voltage side current test of the dynamic hot standby redundant switching control of the DC transformer provided by the embodiment of the application.

[0084] Please refer to Figure 3 and Figure 4 In one specific way of the embodiment of the application, 24 bidirectional LLC resonant DC / DC conversion modules are used to form an IPOS topology, 22 running power modules are put into operation in normal operation, and 2 hot standby power modules are configured. In each detection period, 2 of the 22 running power modules are exchanged with the hot standby power modules.

[0085] When one sub-module fails, the fault module blocks the pulse (including the LLC resonant circuit and the Buck-Boost circuit), and at the same time, the bypass switch is closed to bypass the fault module, and according to the highest sub-module voltage detection result, the corresponding hot standby sub-module is put into operation, that is, the normal pulse of the Buck-Boost circuit is opened, and the Buck-Boost circuit is controlled according to the pulse generated by the modulation wave comparison, and at the same time, the phase shift angle of the put-in hot standby sub-module is updated to the phase shift angle of the fault sub-module. When the dynamic hot standby redundancy switching control method is adopted, the impact current on the high-voltage side before and after the fault is 22A, which greatly reduces the impact current under the original control method.

[0086] Figure 5 The figure is a direct current transformer dynamic hot standby redundancy switching control device block diagram provided by the embodiment of the application.

[0087] Correspondingly, please refer to Figure 5 The second aspect of the embodiment of the application provides a direct current transformer dynamic hot standby redundancy switching control device, the direct current transformer comprising: a first preset number of running power modules and a second preset number of hot standby power modules, comprising: a first acquisition module 1, a sorting module 2 and a first control module 3. Wherein, the first acquisition module 1 is used for acquiring the actual detection voltage of the first preset number of running power modules in the current detection period, obtaining the running voltage difference value of the actual detection voltage of the first preset number of running power modules and the module rated voltage; the sorting module 2 is used for sorting the absolute value of the running voltage difference value, obtaining the third preset number of running power modules with the maximum absolute value of the running voltage difference value, and the third preset number is equal to the smaller one of the first preset number and the second preset number; the first control module 3 is used for exiting the running state of the running power module corresponding to the third preset number of running power modules with the maximum absolute value of the running voltage difference value and putting it into the hot standby state, and acquiring the third preset number of hot standby power modules and putting it into the running state.

[0088] The direct current transformer dynamic hot standby redundancy switching control method described above detects the voltage of a plurality of running power modules, acquires a plurality of running power modules with the maximum absolute value of the difference value from the module rated voltage, and exchanges them with the same number of hot standby power modules, so as to reduce the impact current on the high-voltage side and the low-voltage side at the moment of bypassing the running power module.

[0089] Figure 6 The figure is a first control module schematic diagram provided by the embodiment of the application.

[0090] Specifically, please refer to Figure 6The first control module 3 further comprises: an acquisition unit 31, an ordering unit 32 and a control unit 33. The acquisition unit 31 is configured to acquire the actual detection voltage of the second preset number of hot standby power modules, and obtain the hot standby voltage difference between the actual detection voltage and the module rated voltage of the second preset number of hot standby power modules; the ordering unit 32 is configured to sort the absolute values of the hot standby voltage differences, and obtain the third preset number of hot standby power modules with the smallest absolute value; and the control unit 33 is configured to put the third preset number of hot standby power modules into a running state.

[0091] Further, the DC transformer dynamic hot standby redundancy switching control device further comprises: a second acquisition module 4, a judgment module 5 and a second control module 6. The second acquisition module 4 is configured to acquire the state information of the first preset number of running power modules; the judgment module 5 is configured to judge whether the number of running power modules with faults is less than or equal to the second preset number; and the second control module 6 is configured to bypass the running power modules with faults, put the corresponding number of hot standby power modules into operation, and synchronously switch the phase shift angle when at least one running power module has a fault and the number of faults is less than or equal to the second preset number; and the second control module 6 is configured to control the DC transformer to stop running when at least one running power module has a fault and the number of faults is greater than the second preset number.

[0092] Further, the phase shift angle a is:

[0093]

[0094] Wherein, N1 is the first preset number, and i is the serial number of the running power module with a fault.

[0095] Further, the DC transformer dynamic hot standby redundancy switching control device further comprises: a storage module 7. The storage module 7 is configured to store the actual detection voltage of the first preset number of running power modules acquired in the current detection period.

[0096] Correspondingly, a third aspect of the embodiment of the present application provides an electronic device, comprising: at least one processor; and a memory connected with the at least one processor; wherein the memory stores instructions executable by the one processor, and the instructions are executed by the one processor to enable the at least one processor to execute the DC transformer dynamic hot standby redundancy switching control method.

[0097] Correspondingly, a fourth aspect of the embodiment of the present application provides a computer readable storage medium, which stores computer instructions, and the instructions are executed by a processor to implement the DC transformer dynamic hot standby redundancy switching control method.

[0098] The embodiment of the present application aims to protect a DC transformer dynamic hot standby redundancy switching control method and device, the DC transformer comprising: a first preset number of running power modules and a second preset number of hot standby power modules, wherein the method comprises the following steps: obtaining the actual detection voltage of the first preset number of running power modules in the current detection period, and obtaining the running voltage difference value between the actual detection voltage of the first preset number of running power modules and the module rated voltage; sorting the absolute value of the running voltage difference value to obtain the third preset number of running power modules with the maximum running voltage difference absolute value, wherein the third preset number is equal to the smaller one of the first preset number and the second preset number; exiting the running state of the running power module corresponding to the third preset number of running voltage difference absolute values and putting it into the hot standby state, and obtaining the third preset number of hot standby power modules and putting them into the running state. The above technical scheme has the following effects:

[0099] By detecting the voltage of a plurality of running power modules, a plurality of running power modules with the maximum absolute value of the difference value between the module rated voltage are obtained, and the plurality of running power modules are exchanged with the same number of hot standby power modules to reduce the impact current of the high-voltage side and the low-voltage side of the running power module bypass instantaneously when a fault occurs.

[0100] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take 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.) containing computer usable program code.

[0101] The present application is described with reference to flowcharts and / or block diagrams according to the method, device (system), and computer program product of the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The device that implements the functions specified in one flow or a plurality of flows and / or blocks Figure 1 The device that implements the functions specified in one flow or a plurality of flows and / or blocks

[0102] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the flow Figure 1 of the flow or flows and / or blocks Figure 1 of the block or blocks specified in the flow.

[0103] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flow Figure 1 of the flow or flows and / or blocks Figure 1 of the block or blocks specified in the flow.

[0104] Finally, it should be noted that the above-mentioned embodiments are merely used to illustrate the technical solutions of the present application, rather than limit the present application. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalent replaced without departing from the spirit and scope of the present application, and any modification or equivalent replacement should be covered in the protection scope of the claims of the present application.

Claims

1. A method for dynamic hot standby redundancy switching control of a DC transformer, characterized in that, The direct-current transformer comprises a first preset number of running power modules and a second preset number of hot standby power modules, and comprises the following steps: an actual detection voltage of the first preset number of running power modules in a current detection period is obtained, to obtain a running voltage difference value between the actual detection voltage of the first preset number of running power modules and a module rated voltage; absolute values of the running voltage difference values are sorted, to obtain a third preset number of running power modules with maximum absolute values of the running voltage difference values, wherein the third preset number is equal to a smaller one of the first preset number and the second preset number; the running power modules corresponding to the maximum absolute values of the running voltage difference values are switched from a running state to a hot standby state, and the third preset number of hot standby power modules are obtained and switched to the running state; the obtaining of the third preset number of hot standby power modules and the switching of the third preset number of hot standby power modules to the running state comprise: an actual detection voltage of the second preset number of hot standby power modules is obtained, to obtain a hot standby voltage difference value between the actual detection voltage of the second preset number of hot standby power modules and the module rated voltage; absolute values of a plurality of hot standby voltage difference values are sorted, to obtain the third preset number of hot standby power modules with minimum absolute values of the difference values; the third preset number of hot standby power modules are switched to the running state.

2. The DC transformer dynamic hot standby redundancy switching control method according to claim 1, characterized in that, Before the obtaining of the actual detection voltage of the first preset number of running power modules in the current detection period, the method further comprises: state information of the first preset number of running power modules is obtained; it is determined whether a number of running power modules that have failed is less than or equal to the second preset number; if at least one running power module has failed and the number of failed running power modules is less than or equal to the second preset number, the failed running power modules are bypassed, a corresponding number of hot standby power modules are switched in, and a phase shift angle α is synchronously switched; if at least one running power module has failed and the number of failed running power modules is greater than the second preset number, the direct-current transformer is controlled to stop running.

3. The dynamic hot standby redundancy switching control method of the direct-current transformer according to claim 2, wherein the phase shift angle α is: wherein N1 is the first preset number, and i is a serial number of the running power module that has failed. After the obtaining of the actual detection voltage of the first preset number of running power modules in the current detection period, the method further comprises:

4. The DC-DC converter dynamic hot-standby redundancy switching control method according to claim 1, wherein the actual detection voltage of the first preset number of running power modules obtained in the current detection period is stored. The direct-current transformer comprises a first preset number of running power modules and a second preset number of hot standby power modules, and comprises:

5. A DC transformer dynamic hot standby redundancy switching control device, characterized by, a first obtaining module, configured to obtain an actual detection voltage of the first preset number of running power modules in a current detection period, to obtain a running voltage difference value between the actual detection voltage of the first preset number of running power modules and a module rated voltage; ​ a sorting module configured to sort absolute values of the operating voltage difference values to obtain third preset number of operating power modules with maximum operating voltage difference absolute values, the third preset number being equal to the smaller one of the first preset number and the second preset number; a first control module configured to exit the operating state of the operating power modules corresponding to the third preset number of maximum operating voltage difference absolute values and enter a hot standby state, and to obtain the third preset number of hot standby power modules and enter the operating state; the first control module comprises: an acquisition unit configured to acquire actual detection voltages of the second preset number of hot standby power modules to obtain hot standby voltage difference values between the actual detection voltages of the second preset number of hot standby power modules and the module rated voltage; a sorting unit configured to sort absolute values of the hot standby voltage difference values to obtain the third preset number of hot standby power modules with minimum difference absolute values; a control unit configured to enter the operating state of the third preset number of hot standby power modules.

6. The DC-DC converter dynamic hot-standby redundancy switching control device according to claim 5, characterized in that, Further comprising: a second acquisition module configured to acquire state information of the first preset number of operating power modules; a judgment module configured to judge whether the number of operating power modules with faults is less than or equal to the second preset number; a second control module configured to bypass the operating power modules with faults and simultaneously enter the corresponding number of hot standby power modules and synchronously switch the phase shift angle a when at least one operating power module has a fault and the number of faults is less than or equal to the second preset number; the second control module is configured to control the DC transformer to stop operating when at least one operating power module has a fault and the number of faults is greater than the second preset number.

7. The DC transformer dynamic hot standby redundancy switching control device according to claim 6, wherein the phase shift angle a is: wherein N1 is the first preset number and i is the serial number of the operating power module with a fault. Further comprising:

8. The DC-DC converter dynamic hot standby redundancy switching control device according to claim 5, wherein a storage module configured to store the actual detection voltages of the first preset number of operating power modules acquired in the current detection period. ​

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