CN111009882A - Failure protection control method and system based on MMC solid state redundancy device - Google Patents
Failure protection control method and system based on MMC solid state redundancy device Download PDFInfo
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- CN111009882A CN111009882A CN201911417221.8A CN201911417221A CN111009882A CN 111009882 A CN111009882 A CN 111009882A CN 201911417221 A CN201911417221 A CN 201911417221A CN 111009882 A CN111009882 A CN 111009882A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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Abstract
The invention provides a failure protection control method and a system based on an MMC solid state redundancy device, wherein the method comprises the following steps: when an input submodule in the MMC high-voltage direct-current transmission system breaks down, controlling the input redundancy submodule and bypassing the fault submodule; presetting the direction and the power direction of the bridge arm current on the phase where the fault sub-module is located in the MMC high-voltage direct-current transmission topological structure; detecting the bridge arm current on the phase where the fault submodule is located, and judging the positive and negative of the average value of the bridge arm current on the phase where the fault submodule is located; judging whether the bypass circuit fails according to the positive and negative values of the average value of the bridge arm current and the power direction; and when the bypass circuit fails, controlling the MMC high-voltage direct-current transmission system to cut off power supply. By implementing the invention, the bridge arm current is detected, whether the bypass circuit can effectively remove the fault submodule when the bypass circuit has a fault is judged, and the safety and the reliability of the system are improved.
Description
Technical Field
The invention relates to the technical field of power system operation and power electronics, in particular to a failure protection control method and a system based on an MMC solid-state redundancy device.
Background
In the actual engineering of an MMC (Modular Multilevel Converter) type high-voltage direct-current transmission system, the Modular Multilevel Converter adopts a Sub-module (SM) cascading mode, namely each bridge arm is formed by serially connecting submodules, the number of the bridge arm submodules can reach hundreds, and once the submodules break down, the normal operation of the Converter is influenced. Therefore, a general MMC may configure redundant sub-modules to improve the operational reliability of the system.
When the MMC fails, in order to effectively use the redundant module to ensure the stability of the system operation, a bypass circuit needs to be configured for the sub-module. When a fault occurs, the fault sub-module bypass can be timely removed, and a redundant module is put into use to ensure that the equipment continues to normally operate. When the bypass circuit fails, the MMC cannot continue to operate normally even if the redundant module is switched in. However, in the prior art, the process of judging whether the bypass circuit fails is complicated, and the cost is high.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to solve the problems of complexity and high cost in determining whether the bypass circuit is failed in the prior art, thereby providing a failure protection control method and system based on the MMC solid state redundancy device.
Therefore, the embodiment of the invention provides the following technical scheme:
the first aspect of the embodiment of the invention provides a failure protection control method based on an MMC solid-state redundancy device, which comprises the following steps: when an input submodule in the MMC high-voltage direct-current transmission system breaks down, controlling the input redundancy submodule and bypassing the fault submodule; presetting the direction and the power direction of the bridge arm current on the phase where the fault sub-module is located in the MMC high-voltage direct-current transmission topological structure; detecting the bridge arm current on the phase where the fault submodule is located, and judging the positive and negative of the average value of the bridge arm current on the phase where the fault submodule is located; judging whether the bypass circuit fails according to the positive and negative values of the average value of the bridge arm current and the power direction; and when the bypass circuit fails, controlling the MMC high-voltage direct-current transmission system to cut off power supply.
In one embodiment, the average value of the bridge arm current is determined to be positive or negative according to the current direction flowing to the positive bus of the converter.
In one embodiment, the direction of the current flowing to the positive bus of the inverter is predetermined to be positive.
In an embodiment, the step of determining whether the bypass circuit fails according to the positive and negative values of the average value of the bridge arm currents and the power direction includes: when the average value of the current of the upper bridge arm of the phase where the fault sub-module is located is positive and the power direction is from the alternating current port to the direct current port, judging that the bypass circuit is normal; and when the average value of the current of the bridge arm on the phase where the fault sub-module is located is negative and the power direction is from the alternating current port to the direct current port, judging that the bypass circuit is invalid.
In an embodiment, the step of determining whether the bypass circuit fails according to the positive and negative values of the average value of the bridge arm currents and the power direction further includes: when the average value of the current of the bridge arm on the phase where the fault sub-module is located is positive and the power direction is from the direct current port to the alternating current port, judging that the bypass circuit is invalid; and when the average value of the current of the bridge arm on the phase where the fault sub-module is located is negative and the power direction is from the direct current port to the alternating current port, judging that the bypass circuit is normal.
A second aspect of the embodiments of the present invention provides a failure protection control system based on an MMC solid-state redundancy device, including: the redundancy protection control module is used for controlling the input redundancy sub-module to bypass the fault sub-module when the input sub-module in the MMC high-voltage direct-current power transmission system has a fault; the direction and power direction presetting module is used for presetting the direction and power direction of bridge arm current on a phase where a fault submodule in the MMC high-voltage direct-current transmission topological structure is located; the current average value positive and negative judgment module is used for detecting the bridge arm current on the phase where the fault submodule is located and judging the positive and negative of the bridge arm current average value on the phase where the fault submodule is located; the bypass circuit effectiveness judging module is used for judging whether the bypass circuit fails or not according to the positive and negative values of the average value of the bridge arm current and the power direction; and the failure protection control module is used for controlling the MMC high-voltage direct-current power transmission system to cut off power supply when the bypass circuit fails.
A third aspect of the embodiments of the present invention provides a failure protection control apparatus based on an MMC solid-state redundancy device, including: the MMC solid-state redundancy device comprises at least one processor and a memory which is connected with the at least one processor in a communication mode, wherein the memory stores instructions which can be executed by the at least one processor, and the instructions are executed by the at least one processor so as to enable the at least one processor to execute the failure protection control method based on the MMC solid-state redundancy device according to the first aspect of the embodiment of the invention.
A fourth aspect of the present invention provides a readable storage medium of a failure protection control apparatus based on an MMC solid-state redundancy device, where the readable storage medium stores a computer instruction, and the computer instruction is used to enable a computer to execute the failure protection control method based on the MMC solid-state redundancy device according to the first aspect of the present invention.
The technical scheme of the invention has the following advantages:
the embodiment of the invention provides an MMC (modular multilevel converter) solid-state redundancy device-based failure protection control method and system, which are used for detecting bridge arm current on the basis of configuring a redundancy structure of an original MMC, and judging whether a bypass circuit can effectively remove a fault submodule when a fault occurs, so that reasonable control protection actions are performed. The invention provides a layer of protection for the MMC under the condition of only increasing bridge arm current detection, and the detection method is simple, efficient and low in cost, and improves the safety and reliability of the system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a specific example of a failure protection control method based on an MMC solid-state redundant device in an embodiment of the present invention;
fig. 2 is a schematic diagram of a specific exemplary MMC topology according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a full-bridge submodule structure in an MMC topology structure provided in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a half-bridge sub-module in an MMC topology provided in an embodiment of the present invention;
FIG. 5 is a schematic diagram of the average current values for different states of the bypass circuit according to the embodiment of the present invention;
fig. 6 is a flowchart of another specific example of a failure protection control method based on an MMC solid-state redundant device in an embodiment of the present invention;
fig. 7 is a flowchart of another specific example of a failure protection control method based on an MMC solid-state redundant device in an embodiment of the present invention;
fig. 8 is a block diagram illustrating a specific example of a failure protection control method based on an MMC solid-state redundant device according to an embodiment of the present invention;
fig. 9 is a schematic block diagram of a specific example of the failure protection control apparatus based on the MMC solid-state redundancy device in the embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the invention provides a failure protection control method based on an MMC solid-state redundancy device, which comprises the following steps as shown in figure 1:
step S1: when an input submodule in the MMC high-voltage direct-current transmission system breaks down, the input redundant submodule is controlled to bypass the fault submodule at the same time.
In the embodiment of the present invention, as shown in fig. 2, the MMC topology is configured with redundant sub-modules, and the configuration manner and the configuration number of the redundant sub-modules may be in various forms. When a fault occurs, the fault sub-module bypass can be timely removed, and a redundant module is put into use to ensure that the equipment continues to normally operate. The structure of the MMC bridge arm sub-module may be a full-bridge sub-module as shown in fig. 3, or a half-bridge sub-module as shown in fig. 4, which is only used as an example and not limited thereto.
Step S2: the direction and the power direction of the bridge arm current on the phase where the fault sub-module is located in the MMC high-voltage direct-current transmission topological structure are preset.
In the embodiment of the present invention, the failure of the a-phase is taken as an example, and the flow of the a-phase current is assumed as shown in fig. 2.
Step S3: and detecting the bridge arm current on the phase where the fault submodule is located, and judging the positive and negative of the average value of the bridge arm current on the phase where the fault submodule is located.
In the embodiment of the invention, the current of the upper bridge arm of the phase A in the MMC is detected, and the positive and negative of the average value of the current of the bridge arm is judged.
Step S4: and judging whether the bypass circuit fails according to the positive and negative values of the average value of the bridge arm current and the power direction.
In the embodiment of the invention, whether the bypass circuit fails or not is judged according to the judgment of the positive and negative of the current average value and the power direction of the bridge arm on the phase A.
Step S5: and when the bypass circuit fails, the MMC high-voltage direct-current transmission system is controlled to be powered off. In the embodiment of the present invention, as shown in fig. 3 and 4, the bypass circuit includes a thyristor T1 and a thyristor T2. When the sub-module has a fault, the IGBT in the module is locked, and meanwhile, the solid bypass thyristor T1 or T2 is conducted, and the fault sub-module is in a bypass state.
The embodiment of the invention provides an MMC solid-state redundancy device-based failure protection control method, which is characterized in that bridge arm currents are detected, and whether a bypass circuit can effectively remove a fault submodule when a fault occurs is judged according to the positive and negative values of the average value of the bridge arm currents and the power direction, so that a protection action for controlling an MMC high-voltage direct-current power transmission system to cut off power supply is performed, and the safety and the reliability of the system are improved.
In one embodiment, the direction of the bridge arm current is determined according to the direction of the current flowing to the positive bus of the converter. In the embodiment of the invention, the direction of the current flowing to the positive bus of the current converter is preset to be positive. The bridge arm current detection methods are various, and can be used for direct measurement or indirect measurement. And measuring the current of the bridge arm, and judging the positive and negative properties of the average current, wherein the positive and negative properties are only described for the characteristics of the average current value and can also be defined as the size of the average current and compared with a reference value of zero. The average current values of the bypass in different states are shown in fig. 5, when the bypass is not failed, the average value of the bridge arm current is larger than zero, and when the bypass is failed, the average value of the bridge arm current is smaller than zero.
In one embodiment, the predetermined direction of current flow to the inverter positive bus is positive. In the embodiment of the present invention, the direction of the current flowing to the positive bus of the inverter is assumed as positive.
In an embodiment, the step of determining whether the bypass circuit fails according to the positive and negative values of the average value of the bridge arm currents and the power direction includes, as shown in fig. 6:
step S411: and when the average value of the current of the upper bridge arm of the phase where the fault sub-module is located is positive and the power direction is from the alternating current port to the direct current port, judging that the bypass circuit is normal.
In the embodiment of the present invention, as shown in fig. 3 and 4, when the average value of the bridge arm current on the phase where the faulty submodule is located is positive and the power direction is from the ac port to the dc port, it can be determined that the bypass thyristor T2 is working normally and the bypass circuit is normal.
Step S412: and when the average value of the current of the bridge arm on the phase where the fault sub-module is located is negative and the power direction is from the alternating current port to the direct current port, judging that the bypass circuit is invalid.
In the embodiment of the present invention, as shown in fig. 3 and 4, when the average value of the bridge arm current on the phase where the faulty submodule is located is negative and the power direction is from the ac port to the dc port, it may be determined that the bypass thyristor T2 is faulty and the bypass circuit is failed at this time.
In an embodiment, the step of determining whether the bypass circuit fails according to the positive and negative values of the average value of the bridge arm currents and the power direction further includes, as shown in fig. 7:
step S421: and when the average value of the current of the upper bridge arm of the phase where the fault sub-module is located is positive and the power direction is from the direct current port to the alternating current port, judging that the bypass circuit fails. In the embodiment of the present invention, as shown in fig. 3 and 4, when the average value of the current of the upper bridge arm of the phase where the faulty submodule is located is positive and the power direction is from the dc port to the ac port, it may be determined that the bypass thyristor T1 is faulty and the bypass circuit fails.
Step S422: and when the average value of the current of the bridge arm on the phase where the fault sub-module is located is negative and the power direction is from the direct current port to the alternating current port, judging that the bypass circuit is normal. In the embodiment of the present invention, as shown in fig. 3 and 4, when the average value of the bridge arm current on the phase where the fault sub-module is located is negative and the power direction is from the dc port to the ac port, it can be determined that the bypass thyristor T1 is working normally and the bypass circuit is normal at this time.
An embodiment of the present invention provides a failure protection control system based on an MMC solid state redundancy device, as shown in fig. 8, including:
and the redundancy protection control module 1 is used for controlling the input redundancy sub-module to bypass the fault sub-module when the input sub-module in the MMC high-voltage direct-current power transmission system has a fault. In the embodiment of the present invention, the details are described in relation to step S1 in the above embodiment of the method.
The current direction and power direction presetting module 2 is used for presetting the direction and power direction of bridge arm current on the phase where the fault sub-module is located in the MMC high-voltage direct-current transmission topological structure. In the embodiment of the present invention, the details are described in relation to step S2 in the above embodiment of the method.
And the current average value positive and negative judgment module 3 is used for detecting the bridge arm current on the phase where the fault submodule is located and judging the positive and negative of the bridge arm current average value on the phase where the fault submodule is located. In the embodiment of the present invention, the details are described in relation to step S3 in the above embodiment of the method.
And the bypass circuit effectiveness judging module 4 is used for judging whether the bypass circuit fails according to the positive and negative values of the average value of the bridge arm current and the power direction. In the embodiment of the present invention, the details are described in relation to step S4 in the above embodiment of the method.
And the failure protection control module 5 is used for controlling the MMC high-voltage direct-current power transmission system to cut off power supply when the bypass circuit fails. In the embodiment of the present invention, the details are described in relation to step S5 in the above embodiment of the method.
The functional description of the failure protection control system based on the MMC solid-state redundant device provided in the embodiment of the present invention refers to the description of the failure protection control method based on the MMC solid-state redundant device in the above embodiment in detail.
According to the failure protection control system based on the MMC solid-state redundancy device, on the basis that the original MMC is configured with a redundancy structure, bridge arm current is detected, whether a bypass circuit can effectively cut off a fault submodule when a fault occurs is judged according to the positive and negative values of the average value of the bridge arm current and the power direction, so that a protection action of controlling the MMC high-voltage direct-current power transmission system to cut off power supply is performed, a layer of protection is provided for the MMC under the condition that the bridge arm current detection is only added, the detection method is simple, efficient and low in cost, and the safety and reliability of the system are improved.
An embodiment of the present invention further provides a failure protection control apparatus based on an MMC solid-state redundancy device, as shown in fig. 9, the apparatus terminal may include a processor 61 and a memory 62, where the processor 61 and the memory 62 may be connected by a bus or in another manner, and fig. 9 takes the connection by the bus as an example.
The processor 61 may be a Central Processing Unit (CPU). The Processor 61 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 62, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as the corresponding program instructions/modules in embodiments of the present invention. The processor 61 executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions and modules stored in the memory 62, that is, implements the failure protection control method based on the MMC solid-state redundant device in the above method embodiment.
The memory 62 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 61, and the like. Further, the memory 62 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 62 may optionally include memory located remotely from the processor 61, and these remote memories may be connected to the processor 61 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
One or more modules are stored in the memory 62 and, when executed by the processor 61, perform a fail-safe control method based on MMC solid-state redundant devices as in the embodiments of fig. 1-4 or fig. 6-7.
The details of the failure protection control apparatus based on the MMC solid state redundancy device may be understood by referring to the corresponding descriptions and effects in the embodiments shown in fig. 1 to 4 or fig. 6 to 7, and are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program that can be stored in a computer-readable storage medium and that when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. A failure protection control method based on an MMC solid state redundancy device is characterized by comprising the following steps:
when an input submodule in the MMC high-voltage direct-current transmission system breaks down, controlling the input redundancy submodule and bypassing the fault submodule;
presetting the direction and the power direction of the bridge arm current on the phase where the fault sub-module is located in the MMC high-voltage direct-current transmission topological structure;
detecting the bridge arm current on the phase where the fault submodule is located, and judging the positive and negative of the average value of the bridge arm current on the phase where the fault submodule is located;
judging whether the bypass circuit fails according to the positive and negative values of the average value of the bridge arm current and the power direction;
and when the bypass circuit fails, controlling the MMC high-voltage direct-current transmission system to cut off power supply.
2. The MMC solid-state redundant device-based failure protection control method of claim 1, wherein the direction of the bridge arm current is determined according to the direction of the current flowing to the converter positive bus.
3. The MMC solid-state redundant device-based failure protection control method of claim 2, wherein the predetermined direction of current to the converter positive bus is positive.
4. The MMC solid-state redundancy device-based failure protection control method of claim 3, wherein the step of determining whether the bypass circuit fails according to the average value of the bridge arm current, positive and negative, and the power direction comprises:
when the average value of the current of the upper bridge arm of the phase where the fault sub-module is located is positive and the power direction is from the alternating current port to the direct current port, judging that the bypass circuit is normal;
and when the average value of the current of the bridge arm on the phase where the fault sub-module is located is negative and the power direction is from the alternating current port to the direct current port, judging that the bypass circuit is invalid.
5. The MMC solid-state redundancy device-based failure protection control method of claim 3, wherein the step of determining whether the bypass circuit fails according to the average value of the bridge arm current, positive or negative, and the power direction further comprises:
when the average value of the current of the bridge arm on the phase where the fault sub-module is located is positive and the power direction is from the direct current port to the alternating current port, judging that the bypass circuit is invalid;
and when the average value of the current of the bridge arm on the phase where the fault sub-module is located is negative and the power direction is from the direct current port to the alternating current port, judging that the bypass circuit is normal.
6. A failure protection control system based on MMC solid state redundant device, characterized by comprising:
the redundancy protection control module is used for controlling the input redundancy sub-module to bypass the fault sub-module when the input sub-module in the MMC high-voltage direct-current power transmission system has a fault;
the direction and power direction presetting module is used for presetting the direction and power direction of bridge arm current on a phase where a fault submodule in the MMC high-voltage direct-current transmission topological structure is located;
the current average value positive and negative judgment module is used for detecting the bridge arm current on the phase where the fault submodule is located and judging the positive and negative of the bridge arm current average value on the phase where the fault submodule is located;
the bypass circuit effectiveness judging module is used for judging whether the bypass circuit fails or not according to the positive and negative values of the average value of the bridge arm current and the power direction;
and the failure protection control module is used for controlling the MMC high-voltage direct-current power transmission system to cut off power supply when the bypass circuit fails.
7. A failure protection control apparatus based on MMC solid state redundant device, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to cause the at least one processor to perform the MMC solid state redundant device-based fail safe control method of any of claims 1-5.
8. A readable storage medium of a failure protection control apparatus based on an MMC solid-state redundancy device, wherein the readable storage medium stores computer instructions for causing the computer to execute the failure protection control method based on an MMC solid-state redundancy device according to any one of claims 1 to 5.
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