CN110061483A - The reciprocal current-limiting type high voltage DC breaker of single clamper modular type with flow-limiting valve section - Google Patents
The reciprocal current-limiting type high voltage DC breaker of single clamper modular type with flow-limiting valve section Download PDFInfo
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- CN110061483A CN110061483A CN201910450759.2A CN201910450759A CN110061483A CN 110061483 A CN110061483 A CN 110061483A CN 201910450759 A CN201910450759 A CN 201910450759A CN 110061483 A CN110061483 A CN 110061483A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The present invention provides a kind of reciprocal current-limiting type high voltage DC breaker of single clamper modular type (Topology of Clamped Single Module Type Reciprocating High Voltage DC Circuit Breaker With Current-Limiting Capability) with flow-limiting valve section.The high voltage DC breaker, is used as main current limliting and fault clearance device using single clamper submodule (clamped single submodule, CSSM), has stronger current limiting capacity compared to current limit by inductance device, has two-way through-current capability compared to IGBT.The topology can be switched in series and parallel structure by switching diode bidirectional bridge, the characteristic with stable state low-loss, transient state high impedance.Modularized design is used simultaneously, can freely be increased and decreased circuitry number, single clamper submodule quantity, be changed sub-module types, can be widely used in different application scene.
Description
Technical field
The present invention relates to high-voltage dc transmission distribution technique fields, and in particular to a kind of single clamper modular type with flow-limiting valve section
Reciprocal current-limiting type high voltage DC breaker.
Technical background
Most reliable Fault Isolation mode first is that using dc circuit breaker (Direct Current in DC grid
Circuit Breaker,DCCB).Protection scheme based on dc circuit breaker can be realized quick faulty line and remove and be
System is restarted.Therefore, dc circuit breaker is of great significance to the stable operation of DC grid.
Direct-current breaker topology is numerous, and hybrid dc circuit breaker has both the economy of mechanical dc circuit breaker and pure solid
The reaction speed of state dc circuit breaker, has broad application prospects in DC grid.
Hybrid circuit breaker relies primarily on the cutting that all-controlling power electronics device realizes electric current.The full-control types such as IGBT at present
Device voltage rating, electric current are small, in the occasion of high-voltage large-capacity DC grid, need big metering device in series and parallel to divide, shunt.
But the series-parallel technology of IGBT is not perfect, and there are technical problem, the consistency of switch motion is difficult to be guaranteed, can
It is poor by property.And the higher cost of IGBT, largely it will increase economic cost using IGBT.In order to reduce breaker disjunction failure
The pressure of electric current has topology to inhibit failure initial stage electric current using current-limiting inductance.The voltage class of DC grid is usually higher, if
Current-limiting inductance steadying resistance and the on state resistance of power electronic devices are larger, then will affect the steady-state performance of DC grid.
Summary of the invention
In view of the above-mentioned problems, it is an object of the invention to propose one kind with single clamper submodule (Clamped Single
Submodule, CSSM) break for the reciprocal current-limiting type high voltage direct current of single clamper modular type with flow-limiting valve section of main working cell
Road device topology, can be switched fast between current-limit mode and normal mode of operation, realize reciprocating current limliting.
The specific constituted mode of the present invention is as follows.
The reciprocal current-limiting type high voltage DC breaker of single clamper modular type with flow-limiting valve section, including odd number cutout valve section；
Including the current-limiting inductance being connected in series with cutout valve section；Flow-limiting valve section including connecting different cutout valve section branches.
The cutout valve section of the above-mentioned reciprocal current-limiting type high voltage DC breaker of single clamper modular type with flow-limiting valve section, by through-flow
Branch, transfer branch and arrester branch circuit parallel connection composition.Through-flow branch includes Fast mechanical switch a S and N1A series connection
CSSM is mainly used for flowing through steady-state current and carries out failure current limit；It shifts branch and routes N2A CSSM is connected in series, and is mainly used for turning
It moves fault current and carries out fault clearance；Arrester branch routes several series connection arrester compositions, and it is clear to be mainly used for fault current
Except when pass through arrester absorb surge voltage energy, protect submodule capacitor.
Detailed description of the invention
The following further describes the present invention with reference to the drawings.
Fig. 1 (a) is the main topology of breaker；Fig. 1 (b) is cutout valve section topology；Fig. 1 (c) is CSSM topology；Fig. 1 (d) is
Current path when CSSM is bypassed；Current path when Fig. 1 (e) is CSSM locking；
Breaker equivalent circuit when Fig. 2 is up；
Breaker equivalent circuit when Fig. 3 is DC Line Fault；
Fig. 4 is current limliting stage breaker equivalent circuit；
Fig. 5 is cutout valve section electric current transfer schematic diagram；
Fig. 6 is disjunction delay stage breaker equivalent circuit.
Specific embodiment
For the performance and working principle that the present invention is further explained, below in conjunction with attached drawing to constituted mode and work of the invention
It is specifically described as principle.But the reciprocal current-limiting type high voltage direct current of single clamper modular type with flow-limiting valve section based on the principle is disconnected
Road device is not limited to Fig. 1.
With reference to Fig. 1, the reciprocal current-limiting type high voltage DC breaker of single clamper modular type with flow-limiting valve section, including odd number
(being 3 in figure) cutout valve section；Including the current-limiting inductance being connected in series with cutout valve section；Including connecting different cutout valve section branches
Flow-limiting valve section.
The through-flow branch of cutout valve section includes Fast mechanical switch a S and N1A series connection CSSM, CSSM topological structure is such as
It include three IGBT (T1, T2 and T3), three anti-paralleled diodes (D1, D2 and D3), a separate diode shown in Fig. 1 (c)
D4 and direct current capacitors (C), T3Conducting direction and T1、T2On the contrary.It is single to clamp in the mentioned breaker topology of the present invention
Bit submodule has bypass and locking two kinds of working conditions of work.When the submodule is in bypass condition, T1 shutdown, T2, T3 conducting；
When in blocking, T1, T2, T3 are turned off.The current path of two states is respectively as shown in Fig. 1 (d), (e).
Normal operation, failure current limit and the failure on-off process to breaker are analyzed below.It is mentioned in the present invention
In breaker out, the control mode of all CSSM is identical in each same branch of cutout valve section, for simplicity, uses below
" certain branch locking/bypass " is uniformly controlled state refer to all CSSM in the branch.
Work as t1When DC side failure occurs for the moment, the breaker course of work is divided into 1. steady state operation phase, 2. fault detection
Stage, 3. current limliting stage, 4. electric current transfer and disjunction delay stage, 5. totally 5 stages in fault clearance stage.Breaker is in the stage
3. formally intervening failure process, and the removing of fault current is 5. completed in the stage.The concrete analysis in 5 stages is as follows:
1. steady state operation phase (t0~t1)
Three branch circuit parallel connections of breaker under this stage, the transfer branch locking of cutout valve section, through-flow branch bypass, breaker
Equivalent circuit is as shown in Figure 2.In DCCB1, Ron1 is the electronic power switch device equivalent resistance that through-flow branch puts into circuit, Lp
For current-limiting inductance in branch, Rp is the steadying resistance of Lp.Steady-state current mainly by the voltage difference of both ends converter station, line resistance
It influences, the voltage difference very little between general converter station, the numerical value of steady-state current often only has several kilo-amperes.
2. fault detection stage (t1~t2)
After DC Line Fault occurs, protective device is it is still necessary to want certain time to be detected, and this period, inner breaker was failure to actuate,
Fault current will be through through-flow branch Free Development.Equivalent circuit under malfunction is as shown in Figure 3.After breaking down, failure electricity
Stream is increased with geometric index, and time constant is determined by the equivalent inductance and equivalent resistance of fault point to converter station direct current side outlet
It is fixed.Fault current electric current often can rise to very big numerical value in several milliseconds.
3. current limliting stage (t2~t3)
After protective device detects failure, in t2Moment issues instruction, enables through-flow branch be latched, while converting flow-limiting valve section
Shutdown, three branches of breaker become connecting from parallel-connection structure, into limited current state.Equivalent circuit is as shown in Figure 4 at this time.Failure
DCCB2, R on breaker DCCB1 without influence in the process02、L02With voltage source u2It is omitted in Fig. 4.
4. electric current transfer and disjunction delay stage (t3~t4)
t3Before moment, if failure has been removed, fault current will not continue to develop, and can be made with retriggered CSSM through-flow
Branch bypass directly restores to operate normally；It is on the contrary then need to carry out tripping action.After protective device judgement needs tripping action,
Transfer branch bypass is enabled, fault current will be transferred to transfer branch from through-flow branch.The electric current for further detecting through-flow branch, when
It is less than Fast mechanical switch cut-off allow electric current after, provide separating brake instruction.If detecting, the electric current of through-flow branch is still greater than
Mechanical switch allows drop-out current, then illustrates this end breaker tripping, need to call opposite end breaker actuation with complete failure every
From.Electric current transfer process is as shown in Figure 5.
After the completion of electric current transfer, mechanical switch receives separating brake instruction.In general, the disjunction of mechanical switch needs 2ms to prolong
When, in delay stage, since transfer branch is in bypass condition, fault current still freely rises.
Since mechanical switch has disjunction delay, the fault current already declined increases again.But by breaker
Cascaded structure peace is anti-, current-limiting inductance effect, 1. the fault current development speed in this stage will be less than the stage.
5. fault clearance stage (t4~t5)
After the complete disjunction of mechanical switch, locking transfer branch, fault current is transfer branch capacitor charging, then logical
Cross lightning arrester discharge, fault current decline.
Finally it should be noted that: described embodiment is only some embodiments of the present application, rather than whole realities
Apply example.Based on the embodiment in the application, those of ordinary skill in the art are obtained without making creative work
Every other embodiment, shall fall in the protection scope of this application.
Claims (4)
1. the reciprocal current-limiting type high voltage DC breaker of single clamper modular type with flow-limiting valve section, it is characterised in that: including odd number (2k
+ 1) a cutout valve section being made of CCSM；Flow-limiting valve section including connecting different cutout valve section branches.
2. the reciprocal current-limiting type high voltage DC breaker of single clamper modular type according to right 1 with flow-limiting valve section, feature
Be: cutout valve section is made of through-flow branch, transfer branch and arrester branch three parts, and the through-flow branch of cutout valve section includes
One Fast mechanical switch S and N1A series connection CSSM, CSSM include three IGBT T1, T2 and T3, three anti-paralleled diodes
D1, D2 and D3, a separate diode D4 and direct current capacitors a C, T3Conducting direction and T1、T2On the contrary.CSSM master
It is used to flow through steady-state current and carries out failure current limit；It shifts branch and routes N2A CSSM is connected in series, and is mainly used for shifting failure
Electric current and progress fault clearance；Arrester branch routes several series connection arrester compositions, is mainly used for logical when fault current is removed
It crosses arrester and absorbs surge voltage energy, protect submodule capacitor.In the mentioned breaker topology of the present invention, single clamper submodule
There are bypass and locking two kinds of working conditions of work.When the submodule is in bypass condition, T1 shutdown, T2, T3 conducting；In locking
When state, T1, T2, T3 are turned off.Flow-limiting valve Duan Yousan branch composition, branch 1 by Fast mechanical switch UFD1, UFD2 and
IGBT string VT3, VT4 composition of differential concatenation, branch 2 are made of metal oxide arrester, and branch 3 is by anti-parallel thyristor pair
VH and resistance R, capacitor C composition.Under normal condition, flow-limiting valve section branch 1 is connected, at this moment, 2k+1 cutout valve section it is through-flow
Branch investment, each other parallel running, breaker module only embody the on state resistance of power electronic devices in equivalent circuit
Ron1And the inductance L of through-flow branchpAnd Rp, therefore under stable situation breaker loss it is lower；Under malfunction, through overprotection
The detection delay of device, breaker are devoted oneself to work, firstly, the IGBT of flow-limiting valve section branch 1 is disconnected, fault current starts to branch
3 transfers, increase capacitor C voltage rapidly, and then disconnect flow-limiting valve section branch, and breaker becomes 2k+1 from 2k+1 branch circuit parallel connection
A branch series connection, into limited current state.CSSM capacitor will charge to voltage rating in a very short period of time, turn conducive to fault current
It moves.If failure has been removed, fault current will not continue to develop, and can make through-flow branch with retriggered CSSM and flow-limiting valve section
Bypass directly restores to operate normally；It is on the contrary then need to carry out tripping action.After protective device judgement needs tripping action, enables and turning
Branch bypass is moved, fault current will be transferred to transfer branch from through-flow branch.The electric current for further detecting through-flow branch, when its is small
In Fast mechanical switch cut-off allow electric current after, provide separating brake instruction.
3. the reciprocal current-limiting type high voltage DC breaker of single clamper modular type according to right 1 with flow-limiting valve section, feature
Be: equipped with flow-limiting valve section in breaker, flow-limiting valve section has the ability of bidirectionally conductive and shutdown.
4. the reciprocal current-limiting type high voltage DC breaker of single clamper modular type according to right 1 with flow-limiting valve section, feature
Be: the cutout valve section branch of the breaker can be any odd number, can sufficiently carry out to it extending transversely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910450759.2A CN110061483A (en) | 2019-05-28 | 2019-05-28 | The reciprocal current-limiting type high voltage DC breaker of single clamper modular type with flow-limiting valve section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910450759.2A CN110061483A (en) | 2019-05-28 | 2019-05-28 | The reciprocal current-limiting type high voltage DC breaker of single clamper modular type with flow-limiting valve section |
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| Publication Number | Publication Date |
|---|---|
| CN110061483A true CN110061483A (en) | 2019-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910450759.2A Pending CN110061483A (en) | 2019-05-28 | 2019-05-28 | The reciprocal current-limiting type high voltage DC breaker of single clamper modular type with flow-limiting valve section |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105634259A (en) * | 2015-05-26 | 2016-06-01 | 华北电力大学 | Reliability analysis and redundancy configuration calculation method for hybrid modular multilevel converter |
| US20180137993A1 (en) * | 2016-11-11 | 2018-05-17 | Xi'an Jiaotong University | Magnetic pulse inducted transfer-type dc circuit breaker |
| CN109742740A (en) * | 2018-12-19 | 2019-05-10 | 华北电力大学 | A kind of reciprocal current-limiting type high-voltage direct-current breaker topology of modular type |
| CN109787206A (en) * | 2019-03-06 | 2019-05-21 | 华北电力大学 | A kind of capacitance-resistance type current-limiting type direct-current breaker topology suitable for multiterminal element and DC grid |
-
2019
- 2019-05-28 CN CN201910450759.2A patent/CN110061483A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105634259A (en) * | 2015-05-26 | 2016-06-01 | 华北电力大学 | Reliability analysis and redundancy configuration calculation method for hybrid modular multilevel converter |
| US20180137993A1 (en) * | 2016-11-11 | 2018-05-17 | Xi'an Jiaotong University | Magnetic pulse inducted transfer-type dc circuit breaker |
| CN109742740A (en) * | 2018-12-19 | 2019-05-10 | 华北电力大学 | A kind of reciprocal current-limiting type high-voltage direct-current breaker topology of modular type |
| CN109787206A (en) * | 2019-03-06 | 2019-05-21 | 华北电力大学 | A kind of capacitance-resistance type current-limiting type direct-current breaker topology suitable for multiterminal element and DC grid |
Non-Patent Citations (1)
| Title |
|---|
| 赵鹏豪等: "一种具有直流故障穿越能力的MMC子模块拓扑", 《电网技术》 * |
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Application publication date: 20190726 |