CN105790238A - Bipolar MMC-HVDC power transmission system and protection method against valve-side single-phase grounding fault - Google Patents
Bipolar MMC-HVDC power transmission system and protection method against valve-side single-phase grounding fault Download PDFInfo
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- CN105790238A CN105790238A CN201610272015.2A CN201610272015A CN105790238A CN 105790238 A CN105790238 A CN 105790238A CN 201610272015 A CN201610272015 A CN 201610272015A CN 105790238 A CN105790238 A CN 105790238A
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- mmc
- phase
- transmission system
- chopper
- valve side
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
Abstract
An embodiment of the invention provides a bipolar MMC-HVDC power transmission system and a protection method against valve-side single-phase grounding fault, wherein the method and the protection method relate to the filed of DC power transmission. When the valve-side single-phase grounding fault occurs, a faulted current fault is cut off for protecting system equipment. The system and the method are characterized in that the bipolar MMC-HVDC power transmission system comprises two ends, namely an electric power transmitting end and an electric power receiving end; the electric power transmitting end and the electric power receiving end respectively comprise two poles, namely an anode and a cathode; the electric power transmitting end and the electric power receiving end are respectively provided with a grounding pole; according to one MMC which is connected with at least one pole of at least one end of the MMC-HVDC power transmission system, a circuit breaker is connected with a valve outlet wire of the MMC and the valve-side winding of a transformer; and interruption of one-phase current of the circuit breaker occurs, the circuit breaker switches off the interrupted one-phase current. The bipolar MMC-HVDC power transmission system and the protection method are used for DC electric power transmission.
Description
Technical field
The present invention relates to direct current transportation field, owing to relating to a kind of bipolar MMC-HVDC transmission system
And the guard method of valve side singlephase earth fault.
Background technology
HVDC (English full name: High Voltage Direct Current, English abbreviation:
HVDC), in field of power transmission, modularization multi-level converter based on half-bridge submodule topology is (English
Full name: Modular Multilevel Converter, English abbreviation: MMC), with its modularity journey
Degree is high, harmonic content is little, switching device is lost the advantages such as little, advantage of lower cost and is widely adopted.
HVDC transmission system (hereinafter MMC-HVDC transmission system) based on MMC is led to
Frequently with dipolar configuration, wherein break down and during locking, an other pole can also maintain normal fortune in a pole
OK.
Fig. 1 is the schematic diagram of the anode portion of existing bipolar MMC-HVDC transmission system one end,
The source side winding of transformator is connected with chopper 101, and when breaking down, chopper 101 disconnects, can
Play the effect of protection system equipment.
The DC side of bipolar MMC-HVDC transmission system is configured with earthing pole 102, when valve side occur
During singlephase earth fault, between earthing pole 102 and fault ground point 103, there is fault current path.
So that the situation of valve side singlephase earth fault to occur between MMC and the transformator of connection positive pole 105
As a example by, fault current path is as shown by the arrows in Figure 1.Affected by transformator 104 voltage on valve side,
When voltage on valve side is for time negative, though converter blocking after fault, earthing pole by healthy phases anti-the most also
Connection diode discharges to fault ground point 103, forms fault current path as shown by the arrows in Figure 1.
Due to the unidirectional general character of diode, this fault current is DC current, and this makes transformator 104 net
There is D.C. magnetic biasing component in side electric current, causes current on line side without zero crossing, thus can not trigger chopper
101 disconnect, the now actual effect that can not play protection equipment of chopper 101.
It addition, when valve side singlephase earth fault occurs in negative pole, earthing pole 102 and fault ground point 103
Between there is also fault current path, owing to therefore current on line side can not trigger chopper without zero crossing
101 disconnect, and chopper 101 can not play the effect of protection equipment equally.
In existing bipolar MMC-HVDC transmission system, when valve side singlephase earth fault occurs,
Chopper 101 keeps connection status, it is impossible to play the effect of protection equipment, may cause device damage.
Summary of the invention
The application provides a kind of bipolar MMC-HVDC transmission system and the guarantor of valve side singlephase earth fault
Maintaining method, it is possible to when there is valve side singlephase earth fault, disengagement failure current path is to protect system
Equipment.
For reaching above-mentioned purpose, the application adopts the following technical scheme that
First aspect, it is provided that a kind of bipolar MMC-HVDC transmission system, MMC-HVDC transmits electricity
System includes two ends, respectively sending end and receiving end, and described sending end and described receiving end all include
The two poles of the earth, respectively positive pole and negative pole, described sending end and described receiving end are also configured with earthing pole；Institute
State the MMC that at least one pole of MMC-HVDC transmission system at least one end is connected, its valve outlet with
Connect between the valve side winding of transformator and have chopper；When the phase current through described chopper occurs
Time discontinuously, described chopper disconnects and an interrupted phase current occurs.
Second aspect, it is provided that a kind of bipolar MMC-HVDC transmission system valve side singlephase earth fault
Guard method, including: when determining that connection has a pole of described chopper valve side singlephase earth fault occur
Time, send separating brake instruction to described chopper；When a phase current of described chopper occurs interrupted,
Described chopper disconnects and an interrupted phase current occurs.
Bipolar MMC-HVDC transmission system that embodiments of the invention are provided and and valve side is single-phase connects
The guard method of earth fault, cut-in valve side between the valve outlet and the valve side winding of transformator of MMC
Chopper, the quantity flexibly configurable of valve side chopper.Sending end or receiving end are connected and has valve
One pole of side chopper, when there is valve side singlephase earth fault, the electric current through fault ground point goes out
Now interrupted, trigger valve side chopper disconnects, thus disengagement failure current path, play protection system and set
Standby effect.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below by right
In embodiment description, the required accompanying drawing used is briefly described, it should be apparent that, in describing below
Accompanying drawing be only some embodiments of the present invention, for those of ordinary skill in the art, not
On the premise of paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the partial schematic diagram of existing bipolar MMC-HVDC transmission system one end；
The local of the bipolar MMC-HVDC transmission system that Fig. 2 is provided by embodiments of the invention one
Schematic diagram；
Fig. 3 is in embodiments of the invention one pole in bipolar MMC-HVDC transmission system occur
The rough schematic view of current path during fault；
Fig. 4 is the explanation schematic diagram in embodiments of the invention one to chopper effect；
Fig. 5 is another explanation schematic diagram in embodiments of the invention one to chopper effect；
Bipolar MMC-HVDC transmission system one end knot that Fig. 6 is provided by embodiments of the invention one
The explanation schematic diagram of structure；
The bipolar MMC-HVDC transmission system valve side that Fig. 7 is provided by embodiments of the invention two is single
The guard method schematic flow sheet of phase earth fault.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is entered
Row clearly and completely describes, it is clear that described embodiment is only a part of embodiment of the present invention,
Rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
Have and make the every other embodiment obtained under creative work premise, broadly fall into present invention protection
Scope.
MMC-HVDC transmission system includes sending end and receiving end two ends, and sending end first passes through
MMC completes hand over/directly to change, and transmits electric energy to receiving end.Receiving end completes directly/hands over to turn by MMC
Export after changing.
Sending end and the symmetrical configuration of receiving end, power transformation process is reciprocal.Only pin in embodiments of the invention
Illustrating sending end one end, art technology and personnel can be according to the structure of sending end and changes
Electric process, is expressly understood that structure and the power transformation process of receiving end.
The two ends of bipolar MMC-HVDC transmission system all include positive and negative polarities, logical between positive and negative electrode
Cross earthing pole to be connected with the earth.In existing bipolar MMC-HVDC transmission system, the net of transformator
Side winding connects chopper, but this chopper can not play when there is valve side singlephase earth fault
The effect of protection equipment.In embodiments of the invention, valve side singlephase earth fault specifically refers to, MMC
Valve outlet and the valve side winding of transformator between alternating current circuit on the singlephase earth fault that occurred.
It is an object of the invention to discussion time valve side singlephase earth fault occurs, how to protect asking of system equipment
Topic, illustrates the scheme solving this problem below in conjunction with embodiments of the invention.
Embodiment one
Embodiments of the invention provide a kind of bipolar MMC-HVDC transmission system, including two ends, point
Not Wei sending end and receiving end, sending end and receiving end all include the two poles of the earth, respectively positive pole and negative pole,
Fig. 2 show the local of bipolar MMC-HVDC transmission system, with MMC for three-phase inverter
As a example by situation, a pole 204 of sending end or receiving end connects MMC201.Sending end or receiving end
One pole 204 can be positive pole or negative pole, this extremely corresponding earthing pole 205.
Embodiments of the invention, on the basis of existing bipolar MMC-HVDC transmission system, add
Valve side chopper, valve side chopper refers to the valve outlet being connected to MMC201 and transformator 202
Chopper 203 between the winding of valve side.
Under normal operating conditions, chopper 203 closes.With bipolar MMC-HVDC transmission system
In case of the singlephase earth fault of positive pole generation valve side, valve side singlephase earth fault, and open circuit occur
When device 203 remains closed, the simplification of current path is illustrated as shown in Figure 3.Three-phase circuit is respectively A
Phase, B phase and C phase, each circuitry phase is equivalent to be in series with the single order RL circuit of a diode,
During wherein R is brachium pontis reactance series resistance, earthing pole resistance, ground lead resistance and fault paths
The equivalent resistance of other active loss, L is brachium pontis reactance.
When earth fault occurs in valve side C circuitry phase, earthing pole 205 is by A phase and B circuitry phase
In diode discharge to fault ground point 206, current direction is as shown by the arrows in Figure 3.
During diode current flow, the zero state current expression of fault ground point 206 is:
Wherein:
UmFor valve side line voltage peak, ω is first-harmonic angular frequency.
Can be seen that according to (1) formula the electric current flowing through fault ground point 206 is by constant fundamental frequency exchange minute
AmountDC component with decayComposition.
Due to ω L ＞ ＞ R, it is believed thatThe initial value of DC component is close to the peak of AC compounent
Value.But As time goes on, DC component constantly decays, at a fundamental frequency cycles internal fault electric current
Will be interrupted, fault current drops to zero.
When occurring interrupted through a phase current of chopper 203, chopper 203 disconnects.
Shown in Fig. 4, in a kind of specific embodiment, when chopper 203 disconnects, A phase,
B phase and C phase current all disconnect, and the electric current flowing through fault ground point 206 is cut off.
Or, optionally, in another kind of specific embodiment, chopper 203 possesses split-phase and breaks
The ability opened.Shown in Fig. 5, when the electric current of the fault ground point 206 of C valve side C circuitry phase goes out
Time now discontinuously, chopper 203 only disconnects C phase current, keeps A phase and the conducting of B phase current, i.e.
Chopper 203 only disconnects and an interrupted phase current occurs, to cut off the electricity flowing through fault ground point 206
Stream.
Chopper 20 is specifically as follows a three-phase alternating current chopper, is connected to the three-phase valve of MMC201
Between the three-phase valve side winding of outlet and transformator 203.Or, chopper 20 can also be three
Single phase ac chopper, is connected to each phase valve outlet and the transformator 202 of MMC201
Between the winding of each phase valve side.
MMC-HVDC transmission system two ends (sending end and receiving end) both positive and negative polarity all corresponding one
MMC201 and a transformator 202.MMC201 can be to use half-bridge submodule topology
MMC.In Fig. 2 and subsequent drawings, the dotted line between the internal submodule of MMC201 connects expression
The quantity of module can have multiple.Transformator 202 can be single-phase two-winding transformer, three-phase double wrap
Group transformator, single-phase three-winding transformer or three-phase three-winding transformer etc..
A chopper 203 can be all connected with between each MMC201 and transformator 202, it is possible to
To be only connected a chopper 203 between some MMC201 with transformator 202.Shown in Fig. 2
By connecting a chopper 203 between the MMC201 connected at sending end positive pole and transformator 202
Situation.
Shown in Fig. 6, bipolar MMC-HVDC transmission system one end (sending end or receiving end)
Positive pole 204 and negative pole 206 MMC201 and the transformator 202 that each connect between, be all connected with
One chopper 203, is connected with the earth by earthing pole 205 between positive pole 204 and negative pole 206.
Preferably, the MMC201 that sending end both positive and negative polarity and receiving end both positive and negative polarity are connected and transformator 202
Between, being all connected with a chopper 203, the i.e. structure of sending end and receiving end all can be for Fig. 6 institute
The structure shown.
The bipolar MMC-HVDC transmission system that embodiments of the invention are provided, at the valve of MMC
Cut-in valve side chopper between the valve side winding of outlet and transformator, the quantity of valve side chopper can be flexible
Configuration.Sending end or receiving end are connected and has a pole of valve side chopper, occurring that valve side is single-phase
During earth fault, the electric current through fault ground point occurs that discontinuously, trigger valve side chopper disconnects, from
And disengagement failure current path, play the effect of protection system equipment.
Embodiment two
The bipolar MMC-HVDC transmission system provided based on embodiments of the invention one, the present invention
Embodiment two protection of a kind of bipolar MMC-HVDC transmission system valve side singlephase earth fault is provided
Method, for controlling a kind of described bipolar MMC-HVDC transmission system of embodiment.With reference to figure
Shown in 7, comprise the following steps:
701, when determining that connection has a pole of chopper valve side singlephase earth fault occur, will occur
The sending end of fault one pole and the MMC locking of receiving end, non-faulting pole continues to run.
In a kind of specific embodiment, bipolar MMC-HVDC transmission system includes controlling protection
Module, is used for detecting valve side singlephase earth fault.Wherein valve side singlephase earth fault refers to MMC's
The singlephase earth fault occurred on alternating current circuit between the valve side winding of valve outlet and transformator.When
Control protection module and detect when connection has a pole of valve side chopper valve side singlephase earth fault occur,
By the MMC locking of fault pole sending end and receiving end, non-faulting pole continues to run.
702, when determining that connection has a pole of valve side chopper valve side singlephase earth fault occur, to
Valve side chopper sends separating brake instruction.
The quantity of bipolar MMC-HVDC transmission system internal valve side chopper can configure, can be only at certain
One is connected valve side chopper between MMC with transformator, it is also possible at each MMC and transformator
Between be all connected with valve side chopper.Control protection module and can detect whether that the single-phase earthing event of valve side occurs
Barrier, and send separating brake instruction when fault being detected to the valve side chopper of fault pole.
For example, when sending end positive pole goes out to occur valve side singlephase earth fault, by sending end be subject to
Electricity rectifies the equal locking of MMC of pole, and the MMC of sending end and receiving end negative pole is properly functioning.
703, when a phase current of valve side chopper occurs interrupted, it is interrupted that chopper disconnects appearance
One phase current.
After valve side chopper receives separating brake instruction, disconnect when a phase current occurs interrupted.
The bipolar MMC-HVDC transmission system valve side single-phase earthing event that embodiments of the invention are provided
The guard method of barrier, when detecting that sending end or receiving end connection have a pole of valve side chopper to occur
During the singlephase earth fault of valve side, send separating brake instruction to the valve side chopper of correspondence position, when through event
When the electric current of barrier earth point occurs interrupted, valve side chopper disconnects, thus disengagement failure current path,
Play the effect of protection system equipment.
Above, the only present invention preferably detailed description of the invention, but protection scope of the present invention not office
Being limited to this, any those familiar with the art, can in the technical scope that the invention discloses
The change readily occurred in or replacement, such as to transformator each in bipolar MMC-HVDC transmission system
Plant replacement etc., all should contain within protection scope of the present invention.Protection scope of the present invention should be with
Scope of the claims is as the criterion.
Claims (10)
1. bipolar modules multilevel converter-HVDC MMC-HVDC transmission system, bag
Including two ends, respectively sending end and receiving end, described sending end and described receiving end all include the two poles of the earth, point
Not Wei positive pole and negative pole, described sending end and described receiving end are also configured with earthing pole；It is characterized in that,
The MMC that at least one pole of described MMC-HVDC transmission system at least one end is connected, its valve
It is connected between outlet and the valve side winding of transformator and has chopper；When the phase current through described chopper
When occurring interrupted, described chopper disconnects and an interrupted phase current occurs.
MMC-HVDC transmission system the most according to claim 1, it is characterised in that
Described MMC is the MMC using half-bridge submodule topology.
MMC-HVDC transmission system the most according to claim 1, it is characterised in that
Described chopper possesses the ability that split-phase disconnects.
MMC-HVDC transmission system the most according to claim 3, it is characterised in that
Described chopper is specially a three-phase alternating current chopper, and the three-phase valve being connected to described MMC goes out
Between the three-phase valve side winding of line and transformator.
MMC-HVDC transmission system the most according to claim 3, it is characterised in that
Described chopper is three single phase ac choppers, is connected to each phase valve of described MMC
Between outlet and each phase valve side winding of transformator.
6., according to the MMC-HVDC transmission system described in any one of claim 1-5, its feature exists
In,
Described transformator be following any one:
Single-phase two-winding transformer；
Three-phase two-simulation transformer；
Single-phase three-winding transformer；
Three-phase three-winding transformer.
7. a guard method for bipolar MMC-HVDC transmission system valve side singlephase earth fault, should
For the MMC-HVDC transmission system as described in any one of claim 1-5, it is characterised in that institute
State guard method to include:
When determining that connection has a pole of described chopper valve side singlephase earth fault occur, to described open circuit
Device sends separating brake instruction；
When a phase current of described chopper occurs interrupted, described chopper disconnects and an interrupted phase occurs
Electric current.
Guard method the most according to claim 7, it is characterised in that described method also includes:
When determining that connection has a pole of described chopper valve side singlephase earth fault occur, will break down
The sending end of one pole and the MMC locking of receiving end.
Guard method the most according to claim 7, it is characterised in that when described chopper possesses
During the ability that split-phase disconnects, described chopper disconnects and an interrupted phase current occurs, including:
Only disconnect and an interrupted phase current occurs, keep other phase current to turn on；
Or will appear from an interrupted phase current, and other phase current all disconnects.
10. according to the guard method described in any one of claim 7-9, it is characterised in that described single-phase
Earth fault includes:
Occurred on alternating current circuit between valve outlet and the valve side winding of transformator of MMC single-phase connects
Earth fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610272015.2A CN105790238B (en) | 2016-04-27 | 2016-04-27 | A kind of guard method of bipolar MMC-HVDC transmission system and valve side singlephase earth fault |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610272015.2A CN105790238B (en) | 2016-04-27 | 2016-04-27 | A kind of guard method of bipolar MMC-HVDC transmission system and valve side singlephase earth fault |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110470947A (en) * | 2019-08-15 | 2019-11-19 | 天津大学 | A kind of ground electrode circuit fault distance-finding method suitable for MMC direct current system |
| EP3595116A4 (en) * | 2017-06-02 | 2020-12-16 | NR Electric Co., Ltd. | Fault switch configuration and clearing method in flexible dc converter station |
| US20240030715A1 (en) * | 2020-02-20 | 2024-01-25 | Zhejiang University | Submodule hybrid mmc with low full-bridge ratio and dc fault processing method thereof |
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| US5768079A (en) * | 1996-09-25 | 1998-06-16 | Cooper Industries, Inc. | Adaptive ground and phase fault detection for a power distribution system |
| CN102934310A (en) * | 2010-06-01 | 2013-02-13 | Abb技术有限公司 | Interface arrangement between AC and DC systems using grounding switch |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3595116A4 (en) * | 2017-06-02 | 2020-12-16 | NR Electric Co., Ltd. | Fault switch configuration and clearing method in flexible dc converter station |
| CN110470947A (en) * | 2019-08-15 | 2019-11-19 | 天津大学 | A kind of ground electrode circuit fault distance-finding method suitable for MMC direct current system |
| CN110470947B (en) * | 2019-08-15 | 2021-08-31 | 天津大学 | Grounding electrode line fault distance measurement method suitable for MMC direct current system |
| US20240030715A1 (en) * | 2020-02-20 | 2024-01-25 | Zhejiang University | Submodule hybrid mmc with low full-bridge ratio and dc fault processing method thereof |
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| CN105790238B (en) | 2019-02-15 |
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Effective date of registration: 20210608 Address after: 510700 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: China Southern Power Grid Research Institute Co.,Ltd. Address before: 510080 Guangzhou, Yuexiu District, Guangdong Province Dongfeng East Road, 6 water tower, Guangdong tower. Patentee before: China Southern Power Grid Research Institute Co.,Ltd. Patentee before: CSG POWER GRID TECHNOLOGY RESEARCH CENTER |
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