CN114520586A - Bypass switch refusing non-tripping submodule and converter valve thereof - Google Patents
Bypass switch refusing non-tripping submodule and converter valve thereof Download PDFInfo
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- CN114520586A CN114520586A CN202011297163.2A CN202011297163A CN114520586A CN 114520586 A CN114520586 A CN 114520586A CN 202011297163 A CN202011297163 A CN 202011297163A CN 114520586 A CN114520586 A CN 114520586A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a bypass switch non-operation tripping submodule and a converter valve thereof, which improve the bypass response speed of the submodule and realize the reliable bypass of a fault submodule by arranging two sets of closing circuits and two sets of closing control mechanisms in the submodule, effectively solve the problem of system locking caused by the fault of a black module and a single element, improve the power supply reliability and the availability of MMC flexible direct current transmission to a great extent and promote the development and the application of the flexible direct current transmission technology.
Description
Technical Field
The invention relates to the technical field related to power systems and power electronic flexible direct current converter valves, in particular to a bypass switch non-tripping submodule and a converter valve thereof.
Background
The flexible direct-current power transmission system based on the MMC (Modular Multilevel Converter) is flexible in control, can realize active and reactive independent decoupling control, and has a great market application prospect in the fields of large-scale distributed new energy grid connection, urban power supply, island power supply, black start of a power grid, multi-terminal direct-current networking, weak system networking and the like. At present, a plurality of MMC topological structure application projects exist in China.
At present, a converter valve device fault-tolerant mechanism of an MMC topological structure in a flexible direct current transmission system is to configure submodules in a certain proportion, and bypass the faulty submodules through a closing mechanical bypass switch so as to avoid further expansion of faults. In the engineering, as long as the fault sub-modules are reliably bypassed and the number of the bypassed sub-modules does not exceed the set redundancy number, the system can reliably and safely operate.
If a mechanical bypass switch in the converter valve equipment cannot normally close due to faults, a fault sub-module or a non-fault component is damaged due to overvoltage, an electrical fracture may be formed under an extreme working condition, the safety of the flexible direct-current transmission system is verified to be damaged, and the traditional engineering treatment strategy is to apply for system tripping. In the engineering, each submodule is provided with a mechanical bypass switch, and if a control board card fault (such as an optical fiber fault, an optical transceiver board fault, an energy-taking power supply fault and the like) causes a black module to be generated, the faulty submodule cannot be effectively bypassed. Therefore, system tripping accidents are caused by the fact that the factor module cannot reliably bypass in the engineering, and the reliability and the availability of the operation of the flexible direct current transmission system are greatly reduced.
Disclosure of Invention
Based on the above situation of the prior art, aiming at the situation that the bypass switch of the submodule of the flexible direct current transmission system refuses to move and does not trip, the invention provides the bypass switch refusing and not tripping submodule and the converter valve thereof, which improve the bypass response speed of the MMC submodule, realize the reliable bypass of the fault submodule, improve the power supply reliability and the availability of the MMC flexible direct current transmission to a great extent and promote the development and the application of the flexible direct current transmission technology.
To achieve the above object, according to one aspect of the present invention, there is provided a bypass switch rejections not-tripped sub-module, which includes: the sub-module body module and the bypass protection module; wherein the content of the first and second substances,
the bypass protection module comprises a bypass protection element and a bypass protection trigger control module;
the bypass protection element comprises a bypass thyristor and a bypass switch, the bypass thyristor is reversely connected in parallel with a half-bridge port of the submodule body module, and the bypass switch is connected in parallel with the thyristor;
and the bypass protection trigger control module triggers the bypass switch to be switched on when a fault occurs.
Further, the bypass protection trigger control module comprises a first bypass protection trigger control module and a second bypass protection trigger control module;
the first bypass protection trigger control module comprises an SM control board card trigger control module;
the second bypass protection triggering control module comprises a BOD triggering closing control module.
Further, the SM control board triggers the control module to trigger the bypass switch to be switched on according to the fault state of the sub-module body module.
Further, the BOD triggers a switch-on control module, and when the overvoltage value of the sub-module body module reaches the BOD protection setting value, the bypass switch is triggered to switch on.
Further, the bypass thyristor comprises a reverse overvoltage breakdown bypass thyristor, and the through current is stabilized after overvoltage breakdown.
Further, the bypass thyristor is broken down by the reverse overvoltage, and when the overvoltage value of the sub-module body module reaches the overvoltage breakdown value of the bypass thyristor, the bypass thyristor is broken down by the reverse overvoltage to form a short-circuit path.
According to a second aspect of the present invention, there is provided a converter valve comprising 6 three-phase legs, each of said legs comprising n sub-modules and 1 phase reactor; wherein the sub-module is a bypass switch override untripping sub-module as described above in relation to the first aspect of the invention.
According to a third aspect of the present invention there is provided a fault bypass control method of a sub-module for a bypass switch override non-trip sub-module as described in the first aspect of the present invention above, the control method comprising the steps of:
when the sub-module body module breaks down, judging whether the bypass switch and the SM control board card are normal;
if the bypass switch is normal and the SM control board card is normal, the SM control board card issues a closing instruction to trigger the bypass switch to close;
if the bypass switch is normal, the SM control board card breaks down, and when the capacitor voltage in the sub-module body module reaches a first threshold value, a BOD trigger switch-on control module in the bypass protection trigger control module triggers the bypass switch to switch on;
if the bypass switch fails, when the capacitor voltage in the sub-module body module reaches a second threshold value, the bypass thyristor breaks down to form a short-circuit path.
Further, the first threshold is smaller than the second threshold.
According to a fourth aspect of the present invention there is provided a fault bypass control method of a sub-module for a bypass switch override non-trip sub-module as described in the first aspect of the present invention above, the control method comprising the steps of:
when the sub-module body module breaks down, judging the working condition state;
if the working condition is a non-black module working condition, judging whether the bypass switch is normal or not;
if the bypass switch is normal, triggering the bypass switch to be switched on;
if the bypass switch fails, the bypass thyristor breaks down to form a short-circuit path;
if the fault condition is the black module fault condition, judging whether the bypass switch and the SM control board card are normal;
if the SM control board card is normal, the SM control board card issues a closing instruction to trigger the bypass switch to close;
if the SM control board card has a fault, a BOD trigger switch-on control module in the bypass protection trigger control module triggers the bypass switch to switch on;
and if the bypass switch fails, the bypass thyristor breaks down to form a short-circuit path.
In summary, the bypass response speed of the MMC sub-module is improved, reliable bypass of a fault sub-module is realized, the problem of system locking caused by faults of a black module and a single element is effectively solved, the power supply reliability and the availability of MMC flexible direct-current transmission are improved to a great extent, and the development and the application of a flexible direct-current transmission technology are promoted.
Drawings
FIG. 1 is a schematic diagram of the design principle of the bypass switch rejection non-trip sub-module of the present invention;
FIG. 2 is a schematic diagram of the mechanism of overvoltage generation after the bypass switch fail-safe sub-module of the present invention fails;
FIG. 3 is a schematic diagram of a bypass overvoltage breakdown current loop of the bypass switch rejection no-trip sub-module of the present invention;
FIG. 4 is a topological structure diagram of a flexible direct-current power transmission MMC converter valve of the invention;
FIG. 5 is a flow chart of an implementation of a fault bypass control method of the submodule of the present invention.
FIG. 6 is a flow chart of another implementation of the fault bypass control method of the sub-module of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The following is a detailed description of the technical solution of the present invention, and according to an embodiment of the present invention, a bypass switch rejections-not-tripping submodule is provided, and a schematic design principle diagram of the submodule is shown in fig. 1. The sub-modules include: the sub-module body module and the bypass protection module. The sub-module body module is the same as a common MMC sub-module in the prior art, and can be a half-bridge sub-module, a full-bridge sub-module or other common sub-module topologies. In this embodiment, a half-bridge submodule topology is taken as an example to illustrate the technical solution of this embodiment, and as shown in fig. 1, the submodule body module includes a half-bridge structure formed by a dc capacitor C, 2 controllable switches T1 and T2, and diodes D1 and D2 connected in anti-parallel with the controllable switches T1 and T2. The bypass protection module comprises a bypass protection element and a bypass protection trigger control module. The bypass protection element comprises a bypass thyristor Thy and a bypass switch K, the bypass thyristor Thy is a reverse overvoltage breakdown bypass thyristor, and when the overvoltage value of the submodule body module reaches the overvoltage breakdown value of the bypass thyristor, the reverse overvoltage breakdown bypass thyristor breaks down to form a short-circuit path; the bypass switch K is typically a mechanical bypass switch. The bypass thyristor Thy is reversely connected in parallel with a half-bridge port of the sub-module body module, and the bypass switch K is connected in parallel with the thyristor Thy. And the bypass protection triggering control module comprises an SM control board triggering control module and a BOD triggering closing control module. The SM control board card triggers the control module to trigger the bypass switch to be switched on according to the fault state of the sub-module body module. And the BOD triggers a switch-on control module to trigger the switch-on of the bypass switch when the overvoltage value of the sub-module body module reaches the BOD protection setting value.
According to the submodule provided by the embodiment, due to the arrangement of the structure, the bypass thyristor has a reverse overvoltage breakdown function, and can stably pass through for a long time after overvoltage breakdown; mechanical bypass switch K possesses two sets of combined floodgate control module cooperation two sets of combined floodgate coils, and two sets of combined floodgate control module are completely independent, and SM control integrated circuit board triggers the control module for sending combined floodgate control instruction by SM control integrated circuit board all the way, and another way BOD triggers combined floodgate control module, after MMC submodule piece body module overvoltage value reached BOD protection setting value, relies on BOD to trigger mechanical bypass switch K and closes a floodgate, realizes MMC submodule piece body module bypass. Therefore, under the bypass working condition, the triggering and closing of the mechanical bypass switch K no longer only depends on the SM control board card; still further, even if the bypass switch K body fails, it can still be realized by breaking down the bypass thyristor Thy.
Fig. 2 shows a schematic diagram of the mechanism of overvoltage generation after the bypass switch refuses to trip the submodule fails, when the submodule body fails, the controllable switches T1 and T2 are firstly locked, and the bypass is triggered. If the bridge arm current is in the charging direction, the bridge arm current charges the direct current capacitor C through the D1, and if the sub-module body is not bypassed quickly at the moment, the direct current voltage of the sub-module body continuously rises, so that the safety of equipment is damaged.
Fig. 3 shows a schematic diagram of a bypass overvoltage breakdown through-flow loop of the bypass switch non-tripping sub-module, if the bypass switch K is normal and the SM control board is normal, the sub-module body is locked immediately after the sub-module body fails, and the SM control board triggers the closing mechanical switch K to achieve sub-module body bypass. If bypass switch K is normal, SM control integrated circuit board is unusual, after the sub-module body trouble, shutting down the sub-module body immediately, if SM control integrated circuit board can't issue the combined floodgate instruction, trigger mechanical switch K by BOD trigger combined floodgate control module detection sub-module body voltage and reach first threshold value after closing, realize sub-module body bypass. If bypass switch body K trouble, submodule piece body trouble back, shutting submodule piece body immediately, SM control panel card can't issue the combined floodgate instruction, and when submodule piece voltage reached the back, bypass thyristor Thy reverse breakdown realized submodule piece body bypass, and after submodule piece body bypass, bypass thyristor Thy was the through-flow of stabilizing for a long time. The first threshold value can be set according to the safe working area of the sub-module IGBT and the alternating current and direct current fault ride-through requirement of the flexible direct current transmission system, the second threshold value can be set according to the overvoltage breakdown value of the bypass thyristor Thy, the overvoltage breakdown value is usually 4000V-4500V, and the first threshold value is smaller than the second threshold value.
According to a second embodiment of the invention, a converter valve is provided, the topological structure of which is shown in fig. 4, for a flexible direct current transmission system. As shown in fig. 4, the converter valve is composed of 6 three-phase legs, each of which is formed by connecting n power cells SM (i.e. MMC sub-modules) and a phase reactor Larm in series. The number of the power units SM on each bridge arm is determined by conditions such as the voltage grade of engineering, power devices and the like, and different engineering n values are different. The sub-modules in the converter valve are all bypass switch action rejection non-tripping sub-modules provided by the first embodiment of the invention.
According to a third embodiment of the present invention, a fault bypass control method of a sub-module is provided for controlling the bypass switch non-tripping sub-module, an implementation flowchart of the control method is shown in fig. 5, and the control method includes the following steps:
when the sub-module body module breaks down, judging whether the bypass switch and the SM control board card are normal;
if the bypass switch is normal and the SM control board card is normal, the SM control board card issues a closing instruction to trigger the bypass switch to close;
if the bypass switch is normal, the SM control board card breaks down, and when the capacitor voltage in the sub-module body module reaches a first threshold value, a BOD trigger switch-on control module in the bypass protection trigger control module triggers the bypass switch to switch on;
if the bypass switch fails, when the capacitor voltage in the sub-module body module reaches a second threshold value, the bypass thyristor breaks down to form a short-circuit path.
According to a fourth embodiment of the present invention, a method for controlling a sub-module with a dual-closing mechanism by bypassing a fault is provided, where an implementation flowchart of the method is shown in fig. 6, and the method includes the following steps:
when the sub-module body module breaks down, judging the working condition state;
and removing the sub-module with the known bypass, and defining the sub-module which has no information uploaded all the time in the operation process of the converter valve as a black module. The black module is mainly caused by communication failure or board power failure.
If the working condition is a non-black module working condition, judging whether the bypass switch is normal or not;
if the bypass switch is normal, triggering the bypass switch to be switched on;
if the bypass switch fails, the bypass thyristor breaks down to form a short-circuit path;
if the fault condition is the black module fault condition, judging whether the bypass switch and the SM control board card are normal;
if the SM control board card is normal, the SM control board card issues a closing instruction to trigger the bypass switch to close;
if the SM control board card has a fault, a BOD trigger switch-on control module in the bypass protection trigger control module triggers the bypass switch to switch on;
and if the bypass switch fails, the bypass thyristor breaks down to form a short-circuit path.
In summary, the bypass response speed of the submodule is improved, the reliable bypass of the fault submodule is realized, the problem of system locking caused by the fault of a black module and a single element is effectively solved, the power supply reliability and the availability of MMC flexible direct current transmission are improved to a great extent, and the development and the application of a flexible direct current transmission technology are promoted.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundary of the appended claims, or the equivalents of such scope and boundary.
Claims (10)
1. A bypass switch override untripping sub-module, the sub-module comprising: the sub-module body module and the bypass protection module; wherein the content of the first and second substances,
the bypass protection module comprises a bypass protection element and a bypass protection trigger control module;
the bypass protection element comprises a bypass thyristor and a bypass switch, the bypass thyristor is reversely connected in parallel with a half-bridge port of the submodule body module, and the bypass switch is connected in parallel with the thyristor;
and the bypass protection trigger control module triggers the bypass switch to be switched on when a fault occurs.
2. The submodule of claim 1, wherein the bypass protection trigger control module includes a first bypass protection trigger control module and a second bypass protection trigger control module;
the first bypass protection trigger control module comprises an SM control board card trigger control module;
the second bypass protection triggering control module comprises a BOD triggering closing control module.
3. The submodule of claim 2, wherein the SM control board triggers the control module to trigger the bypass switch to close according to a fault state of the submodule body module.
4. The submodule of claim 3, wherein the BOD triggers a switch-on control module to trigger the switch-on of the bypass switch when the overvoltage value of the submodule body module reaches a BOD protection setting value.
5. The submodule of claim 1, wherein the bypass thyristor comprises a reverse over-voltage breakdown bypass thyristor, the through-flow being stabilized after an over-voltage breakdown.
6. The submodule of claim 5, wherein the reverse overvoltage breakdown bypass thyristor breaks down to form a short circuit path when the submodule body module overvoltage value reaches the overvoltage breakdown value of the bypass thyristor.
7. The converter valve is characterized by comprising 6 three-phase bridge arms, wherein each bridge arm comprises n sub-modules and 1 phase reactor; wherein the sub-module is the bypass switch rejection untripping sub-module of any one of claims 1-6.
8. A fault bypass control method for a bypass switch override untripped sub-module as claimed in any one of claims 1-6, the control method comprising the steps of:
when the sub-module body module breaks down, judging whether the bypass switch and the SM control board card are normal or not;
if the bypass switch is normal and the SM control board card is normal, the SM control board card issues a closing instruction to trigger the bypass switch to close;
if the bypass switch is normal, the SM control board card breaks down, and when the capacitor voltage in the sub-module body module reaches a first threshold value, a BOD trigger switch-on control module in the bypass protection trigger control module triggers the bypass switch to switch on;
if the bypass switch fails, when the capacitor voltage in the sub-module body module reaches a second threshold value, the bypass thyristor breaks down to form a short-circuit path.
9. The control method according to claim 8, characterized in that the first threshold value is smaller than the second threshold value.
10. A fault bypass control method of a sub-module for the bypass switch override non-trip sub-module according to any one of claims 1-6, the control method comprising the steps of:
when the sub-module body module breaks down, judging the working condition state;
if the working condition is a non-black module working condition, judging whether the bypass switch is normal or not;
if the bypass switch is normal, triggering the bypass switch to switch on;
if the bypass switch fails, the bypass thyristor breaks down to form a short-circuit path;
if the fault condition is the black module fault condition, judging whether the bypass switch and the SM control board card are normal;
if the SM control board card is normal, the SM control board card issues a closing instruction to trigger the bypass switch to close;
if the SM control board card has a fault, a BOD trigger switch-on control module in the bypass protection trigger control module triggers the bypass switch to switch on;
and if the bypass switch fails, the bypass thyristor breaks down to form a short-circuit path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011297163.2A CN114520586A (en) | 2020-11-18 | 2020-11-18 | Bypass switch refusing non-tripping submodule and converter valve thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011297163.2A CN114520586A (en) | 2020-11-18 | 2020-11-18 | Bypass switch refusing non-tripping submodule and converter valve thereof |
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| Publication Number | Publication Date |
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| CN114520586A true CN114520586A (en) | 2022-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011297163.2A Pending CN114520586A (en) | 2020-11-18 | 2020-11-18 | Bypass switch refusing non-tripping submodule and converter valve thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115333155A (en) * | 2022-08-29 | 2022-11-11 | 广东电网有限责任公司广州供电局 | Flexible direct-current converter valve submodule redundancy chain and control method thereof |
| CN115372815A (en) * | 2022-08-29 | 2022-11-22 | 广东电网有限责任公司广州供电局 | Device, method and medium for testing closing and bouncing time of sub-module bypass switch |
-
2020
- 2020-11-18 CN CN202011297163.2A patent/CN114520586A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115333155A (en) * | 2022-08-29 | 2022-11-11 | 广东电网有限责任公司广州供电局 | Flexible direct-current converter valve submodule redundancy chain and control method thereof |
| CN115372815A (en) * | 2022-08-29 | 2022-11-22 | 广东电网有限责任公司广州供电局 | Device, method and medium for testing closing and bouncing time of sub-module bypass switch |
| CN115333155B (en) * | 2022-08-29 | 2023-10-20 | 广东电网有限责任公司广州供电局 | Flexible direct current converter valve submodule redundancy chain and control method thereof |
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