CN107370393A - A kind of Modularized multi-level converter sub-module topological structure and its guard method - Google Patents
A kind of Modularized multi-level converter sub-module topological structure and its guard method Download PDFInfo
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- CN107370393A CN107370393A CN201710518819.0A CN201710518819A CN107370393A CN 107370393 A CN107370393 A CN 107370393A CN 201710518819 A CN201710518819 A CN 201710518819A CN 107370393 A CN107370393 A CN 107370393A
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Classifications
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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
- 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
-
- 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
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a kind of Modularized multi-level converter sub-module topological structure and guard method, submodule topological structure includes half-bridge submodule and current limliting module；The current limliting module includes resistance and the gate-controlled switch with the resistor coupled in parallel；The half-bridge submodule and the current limliting block coupled in series.Technical scheme provided by the invention can effectively suppress DC side fault current; reduce the requirement to dc circuit breaker actuation time; and during DC Line Fault; without locking transverter; it ensure that the continuity of Power Control; atom module capacitance is effectively protected, and fast quick-recovery can be realized after fault recovery.
Description
Technical field
The present invention relates to Power System Flexible HVDC protection control field, and in particular to a kind of modular multilevel changes
Flow device submodule topological structure and its guard method.
Background technology
Modularization multi-level converter (Modular Multilevel Converter, MMC) is a kind of new electricity more
The performance such as level voltage source transverter, its modularized design, good autgmentability has wide in fields such as D.C. high voltage transmissions
Application prospect.In structure, MMC is very different with two traditional level, three-level voltage source transverter, and it is by multiple
Submodule (Submodule, SM) is stacked and formed, and by the input of control submodule and is exited, it is possible to control AC to export
Voltage, so as to realize alternating current-direct current Power Exchange.
Traditional MMC-HVDC engineering generally use direct current cables is transmitted, and direct current cables safety and stability performance is preferable,
But its price is higher, long distance powedr transmission cost is higher.And cheap, radiating effect is more used in the transmission of Large Copacity
More preferable overhead line transmission.And in overhead line transmission, traditional half-bridge structure inherently lacks DC Line Fault isolating power.
Half-bridge submodule (HBSM) is faced with a big problem：After being broken down when system dc side, although the insulation of inverter inside
Grid bipolar transistor (IGBTs) will be immediately turned off due to its self-protection function, but due to the presence of fly-wheel diode,
Fault current will exist always.Because the fly-wheel diode of inverter inside will form one after IGBT is all off
Uncontrollable rectifier bridge, so as to cause transverter can not realize the self-cleaning of DC Line Fault.
After DC Line Fault occurs in straight-flow system, fault current can be climbed to very high level, will seriously jeopardize
Related electric equipment in system, influence the safe and reliable operation of system.The flow-resistant capacity of converter valve is to cause direct current network to protect
The principal element of predicament is protected, but is developed or there is investment and time cost etc. to ask using the higher converter valve of technical parameter
Topic.
Therefore, it is necessary to be equipped with suitable failure current limit measure.
The content of the invention
In order to solve the above-mentioned deficiency in the presence of prior art, the present invention provides a kind of modularization multi-level converter
Module topology structure and its guard method.Including half-bridge submodule and current limliting module；
The current limliting module includes resistance and the gate-controlled switch with the resistor coupled in parallel；
The half-bridge submodule includes two switch modules and electric capacity；
It is in parallel with electric capacity after described two switch module series connection.
Preferably, the gate-controlled switch at least two；Described two gate-controlled switch reverse parallel connections.
Preferably, the gate-controlled switch includes gate level turn-off thyristor.
Preferably, the half-bridge structure includes the switch module of two series connection
Preferably, the switch module includes antiparallel insulated gate bipolar transistor and diode.
Preferably, the current limliting module is connected with node 1 or node 2.
A kind of modularization multi-level converter guard method, methods described include：
Under normal operation, the gate-controlled switch in current limliting module applies pulse always, in the conduction state, half-bridge submodule
Block normal work；
When a failure occurs, multilevel converter, which receives direct current protecting action signal and immediately turns off the described of parallel connection, controllable opens
Close, the resistance of the current limliting module is put into fault loop.
Preferably, it is described when a failure occurs, multilevel converter receives direct current protecting action signal and immediately turns off parallel connection
The gate-controlled switch, the resistance of current limliting module input fault loop is included：
Whether failure judgement is permanent fault, if it is, the dc circuit breaker for disconnecting current conversion station is overhauled, treats event
After barrier is repaired, starting recloser current conversion station, retriggered gate-controlled switch after fault clearance is otherwise detected.
Preferably, retriggered gate-controlled switch includes after the detection fault clearance：Multiple points are chosen on the line, are detected
Electric current to the point of selection is below threshold value and can send signal with certain duration by control system and touch again
Gate-controlled switch is sent out, converter valve is recovered normal operating conditions；
The threshold value is between 1.0~2.0p.u..
Compared with prior art, excellent beneficial effect of the invention is：
1) technical scheme provided by the invention, in the transmitting procedure of high-voltage large-capacity, DC side can effectively be suppressed
Fault current, reduce the requirement to dc circuit breaker actuation time；
2) technical scheme provided by the invention, it is improved on the basis of original half-bridge structure, without changing original son
Structure, control strategy and the capacitor voltage equalizing mode of module, principle is simple, and current limitation effect is good；
3) technical scheme provided by the invention, during DC Line Fault, without locking transverter, it ensure that Power Control
Continuity, atom module capacitance is effectively protected, and fast quick-recovery can be realized after fault recovery；
4) technical scheme provided by the invention, using the higher gate level turn-off thyristor of tolerance Current Voltage level, and
Compared with other have the MMC submodule topological structures of Fault Isolation function, component, economic benefit and equipment performance are saved
More preferably.
Brief description of the drawings
Fig. 1 is the modular multilevel converter structure schematic diagram of the present invention；
The working condition when sense of current flows to node 2 by node 1 when Fig. 2 is the current limliting module normal operation of the present invention is shown
It is intended to；
The working condition when sense of current flows to node 1 by node 2 when Fig. 3 is the current limliting module normal operation of the present invention is shown
It is intended to；
Fig. 4 is the sense of current schematic diagram when current limliting module of the present invention realizes DC Line Fault isolation；
Fig. 5 is that the current limliting module of the present invention realizes that DC Line Fault isolates flow chart；
Fig. 6 is another connected mode schematic diagram of the current limliting module of the present invention.
Embodiment
For a better understanding of the present invention, present disclosure is done further with reference to Figure of description and example
Explanation.
For being currently based in the flexible direct current system of modularization multi-level converter, DC Line Fault isolation difficulty is big to ask
Topic, the present invention propose a kind of Modularized multi-level converter sub-module topological structure and its guarantor on the basis of original half-bridge structure
Maintaining method.As shown in figure 1, the submodule is made up of the half-bridge submodule and current limliting block coupled in series connected, new improved structure exists
On the basis of the structure, control strategy and the capacitor voltage equalizing mode that do not change original submodule, current limliting module is added.
Half-bridge submodule is made up of the switch modules and electric capacity of two series connection, and after the series connection of two switch modules with electric capacity
It is in parallel.
Current limliting module is composed in parallel by GTO gate-controlled switches T3, T4 and current-limiting resistance R of two reverse parallel connections, current limliting module
Independent control can be realized.This Modularized multi-level converter sub-module topology can be when breaking down, by controlling GTO
The shut-off of gate-controlled switch quickly puts into current-limiting resistance, so as to realize the function of failure current limit.
With reference to Fig. 2, Fig. 3 and Fig. 4, related description is carried out to the Modularized multi-level converter sub-module principle scheme：
Current limliting module has two kinds of working conditions：
(1) in normal operation, the gate level turn-off thyristor GTO of reverse parallel connection is in turning on shape failure current limit module
State, as shown in Fig. 2 now, current-limiting resistance is bypassed, transverter submodule electric current flows through gate level turn-off thyristor GTO, specifically
Depending on direction is by the submodule sense of current, when the sense of current is that node 1 flows to node 2, current loop such as Fig. 2, when electric current side
To when flowing to node 1 for node 2, current loop such as Fig. 3；
(2) when DC side breaks down, the gate pole of the action signal turn-off reversal parallel connection sent according to fault detection system
Turn-off thyristor GTO, current-limiting resistance is quickly put into fault loop, fault current limiting, avoids fault current from rising to very
High level, so that transverter power electronic devices endangers from excessively stream, as shown in figure 4, it is non-latching to give submodule IGBT
In the case of the current loop that quickly puts into current-limiting resistance after fault loop, when the sense of current is that node 2 flows to node 1.
The submodule IGBT typically lockings under 2-3 times of overcurrent condition, if failure is temporary fault, IGBT excessively stream lockings
In the case of be unfavorable for the fast quick-recovery of transverter after fault recovery.For above-mentioned the proposed module with failure current limit function
Change multilevel converter submodule topological structure, the reasonable setting of current-limiting resistance can make fault current limitation in suitable model
Enclose so that in the situation of most serious, bipolar short trouble, without by IGBT lockings.
The individually gate-controlled switch GTO of control current limliting module, when DC Line Fault occurs, as quickly as possible by GTO lockings.If therefore
Hinder for temporary fault, after detecting fault clearance, retriggered GTO, current conversion station is recovered normal operating conditions.If failure
For permanent fault, cut-off breaker, overhauled, after pending fault is repaired, carry out reclosing, restart current conversion station.Mould
The specific steps of block multilevel converter guard method are as illustrated in the flow chart of figure 5.
Judge whether to receive direct current protecting action signal, if not receiving, the gate-controlled switch in current limliting module applies always
Pulse, it is in the conduction state；
If receiving direct current protecting action signal, multilevel converter receives direct current protecting action signal and immediately turns off parallel connection
The gate-controlled switch, the resistance of the current limliting module is put into fault loop,
Receive direct current protecting action signal, the gate-controlled switch of reverse parallel connection is triggered shut-off, the electricity of the current limliting module
Resistance input fault loop；
Whether failure judgement is permanent fault, if it is, the dc circuit breaker for disconnecting current conversion station is overhauled, treats event
After barrier is repaired, starting recloser current conversion station, retriggered gate-controlled switch after fault clearance is otherwise detected.
Retriggered gate-controlled switch includes after detection fault clearance：Multiple points, the position of selected point are randomly selected on the line
Put should be distributed comprehensively, the quantity of point and need duration according to different system make a concrete analysis of set., detect the point
Electric current can be sent signal retriggered gate-controlled switch less than threshold value and with certain duration by control system, make converter valve
Recover normal operating conditions；Threshold value is between 1.0~2.0p.u..
Modularization multi-level converter with failure current limit function proposed by the invention, ensure that breaker actuation it
Before, by fault current limitation within the scope of acceptable；It can meet that the performance that direct current transient fault passes through will simultaneously
Ask, without locking transverter during failure, beneficial to the fast recovery after fault clearance.In addition, using tolerance electric current, voltage capability
Stronger GTO, compared with the submodule topology with fault current isolating power, economic benefit and equipment performance are more preferable.
Fig. 6 be limited flow module another connected mode application, current limliting module is placed on node 1 and flows into half-bridge structure
Place, the function having with the application, the effect all same realized.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program
Product.Therefore, the application can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the application can use the computer for wherein including computer usable program code in one or more
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to the flow according to the method for the embodiment of the present application, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Embodiments of the invention are these are only, are not intended to limit the invention, it is all in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvements done etc., be all contained in apply pending scope of the presently claimed invention it
It is interior.
Claims (9)
1. a kind of Modularized multi-level converter sub-module topological structure, it is characterised in that including half-bridge submodule and current limliting mould
Block；
The current limliting module includes resistance and the gate-controlled switch with the resistor coupled in parallel；
The half-bridge submodule and the current limliting block coupled in series.
2. Modularized multi-level converter sub-module topological structure as claimed in claim 1, it is characterised in that described controllable to open
Close at least two；Described two gate-controlled switch reverse parallel connections.
3. Modularized multi-level converter sub-module topological structure as claimed in claim 2, it is characterised in that described controllable to open
Pass includes gate level turn-off thyristor.
4. Modularized multi-level converter sub-module topological structure as claimed in claim 1, it is characterised in that half-bridge
Module includes two switch modules and electric capacity；
It is in parallel with electric capacity after described two switch module series connection.
5. Modularized multi-level converter sub-module topological structure as claimed in claim 4, it is characterised in that the switching molding
Block includes antiparallel insulated gate bipolar transistor and diode.
6. Modularized multi-level converter sub-module topological structure as claimed in claim 1, it is characterised in that the current limliting mould
Block is connected with node 1 or node 2.
7. a kind of Modularized multi-level converter sub-module topological structure guard method, it is characterised in that methods described includes：
Under normal operation, the gate-controlled switch in current limliting module applies pulse always, in the conduction state, and half-bridge submodule is just
Often work；
When a failure occurs, multilevel converter receives the gate-controlled switch that direct current protecting action signal immediately turns off parallel connection,
The resistance of the current limliting module is put into fault loop.
8. Modularized multi-level converter sub-module topological structure guard method as claimed in claim 7, it is characterised in that institute
State when a failure occurs, multilevel converter receives the gate-controlled switch that direct current protecting action signal immediately turns off parallel connection, will
The resistance input fault loop of the current limliting module, in addition to：
Whether failure judgement is permanent fault, if it is, the dc circuit breaker for disconnecting current conversion station is overhauled, pending fault is repaiied
After multiple, starting recloser current conversion station, retriggered gate-controlled switch after fault clearance is otherwise detected.
9. Modularized multi-level converter sub-module topological structure guard method as claimed in claim 8, it is characterised in that institute
Retriggered gate-controlled switch includes after stating detection fault clearance：Multiple points are chosen on the line, detect the point of selection
Electric current is below threshold value and signal retriggered gate-controlled switch can be sent by control system with certain duration, makes the change of current
Valve recovers normal operating conditions；
The threshold value is between 1.0~2.0p.u..
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| CN201710518819.0A CN107370393A (en) | 2017-06-29 | 2017-06-29 | A kind of Modularized multi-level converter sub-module topological structure and its guard method |
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| CN201710518819.0A CN107370393A (en) | 2017-06-29 | 2017-06-29 | A kind of Modularized multi-level converter sub-module topological structure and its guard method |
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Family
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448542A (en) * | 2018-02-07 | 2018-08-24 | 许继集团有限公司 | Sub-modular structure with alternating current-direct current fault clearance ability and MMC topological structures |
| CN109980613A (en) * | 2019-03-12 | 2019-07-05 | 天津大学 | Based on the direct-flow distribution system fault recovery method for improving half-bridge submodule |
| CN110011283A (en) * | 2019-03-12 | 2019-07-12 | 天津大学 | Direct-flow distribution system failure separation method based on modified half-bridge submodule |
| CN110726915A (en) * | 2019-08-28 | 2020-01-24 | 重庆大学 | Modular multilevel converter valve submodule IGBT fault detection system and method |
| CN111682523A (en) * | 2020-05-21 | 2020-09-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | MMC rapid simulation model and method considering diode freewheeling function in bridge arm locking |
| CN112910237A (en) * | 2021-03-09 | 2021-06-04 | 国家电网有限公司 | Current conversion chain, current converter and fault clearing method |
| CN113472229A (en) * | 2021-07-15 | 2021-10-01 | 昆明理工大学 | Hybrid bridge arm topological structure with direct-current fault clearing and voltage-sharing capabilities |
| CN113949042A (en) * | 2020-07-17 | 2022-01-18 | 中国南方电网有限责任公司超高压输电公司 | Extra-high voltage direct current valve group and fault valve group isolation method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448542A (en) * | 2018-02-07 | 2018-08-24 | 许继集团有限公司 | Sub-modular structure with alternating current-direct current fault clearance ability and MMC topological structures |
| CN109980613A (en) * | 2019-03-12 | 2019-07-05 | 天津大学 | Based on the direct-flow distribution system fault recovery method for improving half-bridge submodule |
| CN110011283A (en) * | 2019-03-12 | 2019-07-12 | 天津大学 | Direct-flow distribution system failure separation method based on modified half-bridge submodule |
| CN109980613B (en) * | 2019-03-12 | 2021-02-05 | 天津大学 | Direct-current power distribution system fault recovery method based on improved half-bridge submodule |
| CN110011283B (en) * | 2019-03-12 | 2021-02-05 | 天津大学 | Direct-current power distribution system fault isolation method based on improved half-bridge submodule |
| CN110726915A (en) * | 2019-08-28 | 2020-01-24 | 重庆大学 | Modular multilevel converter valve submodule IGBT fault detection system and method |
| CN111682523A (en) * | 2020-05-21 | 2020-09-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | MMC rapid simulation model and method considering diode freewheeling function in bridge arm locking |
| CN113949042A (en) * | 2020-07-17 | 2022-01-18 | 中国南方电网有限责任公司超高压输电公司 | Extra-high voltage direct current valve group and fault valve group isolation method |
| CN112910237A (en) * | 2021-03-09 | 2021-06-04 | 国家电网有限公司 | Current conversion chain, current converter and fault clearing method |
| CN113472229A (en) * | 2021-07-15 | 2021-10-01 | 昆明理工大学 | Hybrid bridge arm topological structure with direct-current fault clearing and voltage-sharing capabilities |
| CN113472229B (en) * | 2021-07-15 | 2024-04-26 | 昆明理工大学 | Hybrid bridge arm topological structure with direct current fault clearing and voltage equalizing capabilities |
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Application publication date: 20171121 |