CN111711350A - MMC converter valve operation reliability improving method - Google Patents
MMC converter valve operation reliability improving method Download PDFInfo
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- CN111711350A CN111711350A CN202010498254.6A CN202010498254A CN111711350A CN 111711350 A CN111711350 A CN 111711350A CN 202010498254 A CN202010498254 A CN 202010498254A CN 111711350 A CN111711350 A CN 111711350A
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- submodule
- sub
- module
- modules
- thyristor
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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
- 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
-
- 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
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
-
- 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
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Inverter Devices (AREA)
- Power Conversion In General (AREA)
Abstract
The invention discloses a method for improving the operation reliability of an MMC converter valve, which adopts adjacent MMC sub-modules to form a pair, and thyristors of the sub-modules all adopt bidirectional thyristors; in the same team, the upper port of the lower submodule thyristor is connected with the upper end line of the upper submodule, and the lower port of the lower submodule thyristor is connected with the lower end line of the lower submodule; the lower port of the upper submodule thyristor is connected with the lower end line of the lower submodule, and the upper port of the upper submodule thyristor is connected with the upper end line of the upper submodule; and a butt joint line is additionally arranged between the power supply board card of each sub-module and the power supply board cards of the adjacent sub-modules in other teams, so that mutual power supply between the adjacent sub-modules in two different teams is realized. The method can effectively avoid the locking of the MMC converter valve caused by the failure of the bypass switch of the sub-module or the uplink communication fault and the like, thereby effectively improving the operation reliability of the MMC converter valve; the invention is simply transformed on the basis of the atomic module, has less workload and low increased transformation cost and is beneficial to the transformation of the prior engineering.
Description
Technical Field
The invention belongs to the field of flexible direct current power transmission and distribution, and particularly relates to a method for improving the operation reliability of an MMC converter valve.
Background
The submodule redundancy design of the MMC converter valve is the key for greatly improving the operation reliability of the MMC converter valve. When a certain submodule has a fault, the corresponding bypass switch is switched on smoothly to realize the removal of the faulty submodule, so that the normal operation of the remaining sound system is ensured. However, in the existing flexible direct current actual operation process, the converter valve is locked and quit operation due to the problems that a single sub-module bypass switch fails to operate, or an uplink communication fault occurs in a single sub-module. The whole converter valve is equivalent to the fault of a single submodule, the converter valve is locked, the operation reliability of the flexible direct current transmission system is seriously influenced, and the aim of redundancy design is not effectively met to a certain extent.
For the sub-module, when the sub-module needs to be bypassed and exited in case of a fault or the like, the following two points need to be simultaneously achieved, so that the converter valve can be ensured to continue to normally work: firstly, the bypass switch is successfully switched on, and secondly, the direct current control system receives a switching-on signal of the bypass switch. If the bypass switch is not successfully switched on (refused to be operated), the sub-module is continuously connected into the bridge arm in series, and devices such as an IGBT (insulated gate bipolar transistor), a capacitor and the like face dangers such as overvoltage and the like. If the direct current control system cannot effectively receive the relevant signals, even if the bypass switch is switched on, the direct current control system can also lock the whole converter valve for ensuring the safe operation of the whole system. Therefore, in order to effectively reduce the shutdown of the whole converter valve caused by the internal fault of a single sub-module, an improvement strategy is needed to be provided, and the advantage of redundancy configuration is really improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for improving the operation reliability of an MMC converter valve by adopting a submodule modification mode on the premise of reducing the modification cost as much as possible and not damaging the independent control operation of submodules, so as to solve the problem that the whole operation reliability of the converter valve is reduced due to the bypass failure of the submodules in the current flexible-straight engineering.
Therefore, the invention adopts the following technical scheme: a method for improving the operation reliability of an MMC converter valve adopts two adjacent MMC sub-modules to form a team, and thyristors of the sub-modules all adopt bidirectional thyristors; in the same team, the upper port of the lower submodule thyristor is connected with the upper end line of the upper submodule, and the lower port of the lower submodule thyristor is connected with the lower end line of the lower submodule; the lower port of the upper submodule thyristor is connected with the lower end line of the lower submodule, and the upper port of the upper submodule thyristor is connected with the upper end line of the upper submodule; a butt joint line is added between the power supply board card of each sub-module and the power supply board cards of adjacent sub-modules in other teams, so that mutual power supply between the adjacent sub-modules in two different teams is realized;
after two liang of teams of adjacent MMC submodule pieces, to the various operating modes that the submodule piece met, the corresponding action is as follows:
when the submodule fails and needs to quit operation, the submodule blocks an IGBT trigger signal and then applies a closing command to the bypass switch, if the bypass switch is closed smoothly and the direct current control system receives corresponding feedback information, the submodule bypasses successfully, and the converter valve continues to operate normally under the condition that the number of the bypass submodules does not exceed the redundancy number;
if the bypass switch fails to be switched on or the uplink communication link of the submodule fails, no matter the power board card fails, the bypass switch driving circuit fails, the bypass switch fails and the bypass switch switching-on command communication link fails, the submodule and the other submodule of the team of the submodule send a conduction command of triggering the bidirectional thyristor, the other submodule needs to lock an IGBT triggering pulse first, and the two submodules of the team are reliably bypassed.
After the two sub-modules are bypassed by the bidirectional thyristor, the capacitors of the sub-modules are not charged any more, so that the capacitor voltages of the two sub-modules are gradually reduced along with the lapse of time until the normal power supply requirement cannot be met. The power supply board card of the adjacent submodule in other teams is added with a wire connecting measure, so that the submodule bypassed by the bidirectional thyristor gets power to the adjacent submodule which does not exit from operation, the bidirectional thyristor is ensured to be triggered and conducted all the time, and then the failed submodule is ensured to continuously keep the bypass exit state.
Further, the MMC sub-module is a half-bridge sub-module, a full-bridge sub-module or a clamping type double sub-module.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method can effectively avoid the locking of the MMC converter valve caused by the failure of the bypass switch of the sub-module or the uplink communication fault and the like, and further can effectively improve the operation reliability of the MMC converter valve.
(2) The method is suitable for topologies such as a half-bridge submodule, a full-bridge submodule, a clamping bimodule and the like.
(3) The invention is simply transformed on the basis of the atomic module, has less workload and low increased transformation cost and is beneficial to the transformation of the prior engineering.
Drawings
FIG. 1 is a schematic diagram of a sub-module structure modification according to the present invention;
fig. 2 is a schematic diagram of the wiring modification of the sub-module of the present invention.
Detailed Description
To describe the present invention more specifically, the following detailed description of the technical solution of the present invention and the related principles thereof are provided with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, based on the original MMC sub-module (in this embodiment, a half-bridge sub-module is taken as an example, and actually, topological forms such as a full-bridge sub-module and a clamping bi-sub-module are equally applicable), the present invention adopts a form of grouping two by two adjacent sub-modules to reform the sub-modules, and there are three reforming places:
firstly, the unidirectional thyristors of the submodule are all changed into bidirectional thyristors, and the bidirectional thyristors have bidirectional current conduction capability;
secondly, in the same team, the upper port of the lower sub-module thyristor is connected with the upper end line of the upper sub-module instead, and the lower port of the lower sub-module thyristor is still connected with the lower end line of the lower sub-module; the lower port of the upper sub-module thyristor is connected with the lower end line of the lower sub-module instead, and the upper port of the upper sub-module thyristor is still connected with the upper end line of the upper sub-module, as shown in fig. 2.
Thirdly, a butt joint line is added between the power supply board card of each sub-module and the power supply board cards of adjacent sub-modules in other teams, so that mutual power supply between the adjacent sub-modules in two different teams is realized, and the bypassed sub-modules have continuous power supply.
After the sub-modules are grouped and reformed, corresponding actions are as follows according to various working conditions met by the sub-modules:
when the submodule fails and needs to quit operation, the submodule blocks the IGBT trigger signal and then applies a closing command to the bypass switch, if the bypass switch is closed smoothly and the direct current control system receives corresponding feedback information such as closing and the like, the submodule bypasses successfully, and the converter valve can continue to operate normally under the condition that the number of the bypass submodules does not exceed the redundancy number.
If the bypass switch fails to be switched on or the uplink communication link of the sub-module fails, no matter the power board card fails, the bypass switch driving circuit fails, the bypass switch fails and the communication link of the bypass switch switching-on command fails, the sub-module and the other sub-module of the two teams send out a bidirectional thyristor triggering instruction (the other sub-module needs to lock an IGBT triggering pulse firstly), and the sub-modules of the two teams are reliably bypassed.
After the two sub-modules are bypassed by the bidirectional thyristor, the capacitors of the sub-modules are not charged any more, so that the capacitor voltages of the two sub-modules are gradually reduced along with the lapse of time until the normal power supply requirement cannot be met. The power supply board card of the adjacent submodule in other teams is added with a wire connecting measure, so that the submodule bypassed by the bidirectional thyristor gets power to the adjacent submodule which does not exit from operation, the bidirectional thyristor is ensured to be triggered and conducted all the time, and then the failed submodule is ensured to continuously keep the bypass exit state.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (2)
1. A method for improving the operation reliability of an MMC converter valve is characterized in that adjacent MMC sub-modules are grouped pairwise, and thyristors of the sub-modules all adopt bidirectional thyristors; in the same team, the upper port of the lower submodule thyristor is connected with the upper end line of the upper submodule, and the lower port of the lower submodule thyristor is connected with the lower end line of the lower submodule; the lower port of the upper submodule thyristor is connected with the lower end line of the lower submodule, and the upper port of the upper submodule thyristor is connected with the upper end line of the upper submodule; a butt joint line is added between the power supply board card of each sub-module and the power supply board cards of adjacent sub-modules in other teams, so that mutual power supply between the adjacent sub-modules in two different teams is realized;
after two liang of teams of adjacent MMC submodule pieces, to the various operating modes that the submodule piece met, the corresponding action is as follows:
when the submodule fails and needs to quit operation, the submodule blocks an IGBT trigger signal and then applies a closing command to the bypass switch, if the bypass switch is closed smoothly and the direct current control system receives corresponding feedback information, the submodule bypasses successfully, and the converter valve continues to operate normally under the condition that the number of the bypass submodules does not exceed the redundancy number;
if the bypass switch fails to be switched on or the uplink communication link of the submodule fails, no matter the power board card fails, the bypass switch driving circuit fails, the bypass switch fails and the bypass switch switching-on command communication link fails, the submodule and the other submodule of the team of the submodule send a conduction command of triggering the bidirectional thyristor, the other submodule needs to lock an IGBT triggering pulse first, and the two submodules of the team are reliably bypassed.
2. The method for improving the operational reliability of the MMC converter valve according to claim 1, wherein the MMC sub-module is a half-bridge sub-module, a full-bridge sub-module or a clamp type dual sub-module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010498254.6A CN111711350A (en) | 2020-06-04 | 2020-06-04 | MMC converter valve operation reliability improving method |
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| CN202010498254.6A CN111711350A (en) | 2020-06-04 | 2020-06-04 | MMC converter valve operation reliability improving method |
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Application publication date: 20200925 |
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