CN105790238B - A kind of guard method of bipolar MMC-HVDC transmission system and valve side singlephase earth fault - Google Patents
A kind of guard method of bipolar MMC-HVDC transmission system and valve side singlephase earth fault Download PDFInfo
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- CN105790238B CN105790238B CN201610272015.2A CN201610272015A CN105790238B CN 105790238 B CN105790238 B CN 105790238B CN 201610272015 A CN201610272015 A CN 201610272015A CN 105790238 B CN105790238 B CN 105790238B
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- breaker
- mmc
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- valve side
- transmission system
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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
The embodiment of the present invention provides the guard method of a kind of bipolar MMC-HVDC transmission system and valve side singlephase earth fault, is related to direct current transportation field, can be when there is valve side singlephase earth fault, and disengagement failure current path is to protect system equipment.The specific scheme is that MMC-HVDC transmission system includes both ends, respectively sending end and receiving end, the sending end and the receiving end include the two poles of the earth, and respectively anode and cathode, the sending end and the receiving end are also configured with earthing pole；Breaker is connected between the valve side winding of the MMC that an at least pole of the MMC-HVDC transmission system at least one end is connected, valve outlet and transformer；When occurring interrupted by a phase current of the breaker, the breaker, which disconnects, there is an interrupted phase current.The present invention is used for direct current transportation.
Description
Technical field
The present invention relates to direct current transportation field, due to being related to a kind of bipolar MMC-HVDC transmission system and valve side single-phase earthing
The guard method of failure.
Background technique
It transmits electricity and leads in high voltage direct current (full name in English: High Voltage Direct Current, English abbreviation: HVDC)
In domain, the modularization multi-level converter (full name in English: Modular Multilevel based on half-bridge submodule topology
Converter, English abbreviation: MMC), with its degree of modularity is high, harmonic content is small, small, cost is lost relatively in switching device
Low advantage and be widely adopted.
HVDC transmission system (hereinafter MMC-HVDC transmission system) based on MMC generallys use dipolar configuration, wherein
When one pole is broken down and is latched, in addition a pole can also maintain to operate normally.
Fig. 1 is the schematic diagram of the anode portion of existing bipolar MMC-HVDC transmission system one end, the net side of transformer around
Group is connect with breaker 101, and breaker 101 disconnects in the event of a failure, can play the role of protecting system equipment.
The DC side of bipolar MMC-HVDC transmission system is configured with earthing pole 102, when there is valve side singlephase earth fault,
There are fault current paths between earthing pole 102 and fault ground point 103.
In case where there is valve side singlephase earth fault between the MMC and transformer for connecting anode 105, fault current
Access is as shown by the arrows in Figure 1.It is influenced by 104 voltage on valve side of transformer, when voltage on valve side is negative, even if the change of current after failure
Device locking, earthing pole are discharged by the anti-paralleled diode of non-faulting phase to fault ground point 103, and arrow institute as shown in figure 1 is formed
The fault current path shown.Due to the one-way conduction of diode, which is DC current, this makes transformer 104
There is D.C. magnetic biasing component in current on line side, causes current on line side without zero crossing, thus cannot trigger the disconnection of breaker 101, at this time
Breaker 101 cannot actually play the role of protecting equipment.
In addition, when there is valve side singlephase earth fault in cathode, between earthing pole 102 and fault ground point 103 there is also
Fault current path is disconnected because therefore current on line side cannot trigger breaker 101 without zero crossing, and breaker 101 equally cannot
Play the role of protecting equipment.
In existing bipolar MMC-HVDC transmission system, when there is valve side singlephase earth fault, breaker 101 keeps connecting
State is connect, cannot play the role of protecting equipment, may cause equipment damage.
Summary of the invention
The application provides the guard method of a kind of bipolar MMC-HVDC transmission system and valve side singlephase earth fault, Neng Gou
When there is valve side singlephase earth fault, disengagement failure current path is to protect system equipment.
In order to achieve the above objectives, the application adopts the following technical scheme that
In a first aspect, providing a kind of bipolar MMC-HVDC transmission system, MMC-HVDC transmission system includes both ends, respectively
Sending end and receiving end, the sending end and the receiving end include the two poles of the earth, respectively anode and cathode, the sending end and
The receiving end is also configured with earthing pole；The MMC that an at least pole of the MMC-HVDC transmission system at least one end is connected,
Breaker is connected between valve outlet and the valve side winding of transformer；Occur discontinuously when by a phase current of the breaker
When, the breaker, which disconnects, there is an interrupted phase current.
Second aspect provides a kind of guard method of bipolar MMC-HVDC transmission system valve side singlephase earth fault, comprising:
When determining that valve side singlephase earth fault occurs in the pole for being connected with the breaker, separating brake instruction is sent to the breaker；
When a phase current of the breaker occurs interrupted, the breaker, which disconnects, there is an interrupted phase current.
Bipolar MMC-HVDC transmission system provided by the embodiment of the present invention and and valve side singlephase earth fault protection
Method, the cut-in valve side breaker between the valve outlet of MMC and the valve side winding of transformer, the quantity of valve side breaker can be flexible
Configuration.It is connected with a pole of valve side breaker for sending end or receiving end, when there is valve side singlephase earth fault, passes through
The electric current of fault ground point occurs discontinuously, and trigger valve side breaker disconnects, so that disengagement failure current path, plays protection system
The effect of equipment.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, embodiment will be described below
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is the partial schematic diagram of existing bipolar MMC-HVDC transmission system one end；
Fig. 2 is the partial schematic diagram of bipolar MMC-HVDC transmission system provided by the embodiment of the present invention one；
Fig. 3 is current path when breaking down in the embodiment of the present invention one to a pole in bipolar MMC-HVDC transmission system
Rough schematic view；
Fig. 4 is to illustrate schematic diagram to breaker effect in the embodiment of the present invention one；
Fig. 5 is to illustrate schematic diagram to the another of breaker effect in the embodiment of the present invention one；
Fig. 6 illustrates to illustrate for bipolar one end structure of MMC-HVDC transmission system provided by the embodiment of the present invention one
Figure；
Fig. 7 is the guarantor of bipolar MMC-HVDC transmission system valve side singlephase earth fault provided by the embodiment of the present invention two
Maintaining method flow diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
MMC-HVDC transmission system includes sending end and receiving end both ends, and sending end is completed to hand over/straight turn first by MMC
It changes, transmits electric energy to receiving end.Receiving end exports after completing straight/friendship conversion by MMC.
The symmetrical configuration of sending end and receiving end, power transformation process are reciprocal.Only for sending end one in the embodiment of the present invention
End is illustrated, and art technology and personnel can be expressly understood that receiving end according to the structure and power transformation process of sending end
Structure and power transformation process.
The both ends of bipolar MMC-HVDC transmission system include positive and negative polarities, pass through earthing pole and the earth between positive and negative electrode
Connection.In existing bipolar MMC-HVDC transmission system, the source side winding of transformer is connected with breaker, however the breaker exists
Occur to play the role of protecting equipment when the singlephase earth fault of valve side.In the embodiment of the present invention, the event of valve side single-phase earthing
Barrier specifically refers to, the singlephase earth fault occurred on the alternating current circuit between the valve outlet of MMC and the valve side winding of transformer.
When occurring valve side singlephase earth fault it is an object of the invention to discuss, the problem of how protecting system equipment, below in conjunction with this
The embodiment of invention illustrates the scheme for solving the problems, such as this.
Embodiment one
The embodiment of the present invention provides a kind of bipolar MMC-HVDC transmission system, including both ends, respectively sending end and by
Electric end, sending end and receiving end include the two poles of the earth, and respectively anode and cathode, Fig. 2 show bipolar MMC-HVDC transmission system
Part, by taking MMC is the situation of three-phase inverter as an example, a pole 204 of sending end or receiving end connects MMC201.Sending end or
One pole 204 of receiving end can be anode or cathode, this extremely corresponds to earthing pole 205.
The embodiment of the present invention increases valve side breaker, valve on the basis of existing bipolar MMC-HVDC transmission system
Side breaker refers to the breaker 203 between the valve side winding of the valve outlet and transformer 202 that are connected to MMC201.
Under normal operating conditions, breaker 203 is closed.It is single-phase that valve side occurs with the anode of bipolar MMC-HVDC transmission system
In case where ground fault, there is valve side singlephase earth fault, and when breaker 203 remains closed, the simplification of current path
Signal is as shown in Figure 3.Three-phase circuit is respectively A phase, B phase and C phase, and every one-phase circuit is equivalent to be in series with the one of a diode
Rank RL circuit, wherein R is bridge arm reactance series resistance, ground connection electrode resistance, other in ground lead resistance and fault paths has
The equivalent resistance of function loss, L are bridge arm reactance.
When valve side, ground fault occurs in C circuitry phase, earthing pole 205 passes through the diode in A phase and B circuitry phase to failure
Grounding point 206 discharges, and current direction is as shown by the arrows in Figure 3.
During diode current flow, the nought state current expression of fault ground point 206 are as follows:
Wherein:
UmFor valve side line voltage peak, ω is fundamental wave frequency.
It can be seen that the electric current for flowing through fault ground point 206 by constant fundamental frequency AC compounent according to (1) formulaWith the DC component of decayingComposition.
Due to ω L > > R, it is believed thatPeak value of the initial value of DC component close to AC compounent.But with
The passage of time, DC component constantly decay, will be interrupted in a fundamental frequency cycles internal fault electric current, fault current is fallen to
Zero.
When occurring interrupted by a phase current of breaker 203, breaker 203 is disconnected.
As shown in connection with fig. 4, in a kind of specific embodiment, when breaker 203 disconnects, A phase, B phase and C phase current are equal
It disconnects, the electric current for flowing through fault ground point 206 is cut off.
Alternatively, optional, in another specific embodiment, breaker 203 has the ability of split-phase disconnection.In conjunction with
Shown in Fig. 5, when the electric current of the fault ground point 206 of C valve side C circuitry phase occurs interrupted, breaker 203 only disconnects C phase current,
A phase and the conducting of B phase current are kept, i.e., breaker 203, which only disconnects, an interrupted phase current occurs, flows through fault ground point with cutting
206 electric current.
Breaker 20 is specifically as follows a three-phase alternating current breaker, is connected to the outlet of three-phase valve and the transformer of MMC201
Between 203 three-phase valve side winding.Alternatively, breaker 20 can also be three single phase ac breakers, it is connected to
Between each phase valve outlet of MMC201 and each phase valve side winding of transformer 202.
MMC-HVDC transmission system both ends (sending end and receiving end) positive and negative anodes correspond to MMC201 and transformation
Device 202.MMC201 can be for using the MMC of half-bridge submodule topology.In Fig. 2 and subsequent drawings inside MMC201 submodule it
Between dotted line connection indicate submodule quantity can have it is multiple.Transformer 202 can be double for single-phase two-winding transformer, three-phase
Winding transformer, single-phase three-winding transformer or three-phase three-winding transformer etc..
A breaker 203 can be all connected between each MMC201 and transformer 202, it can also be only at some
A breaker 203 is connected between MMC201 and transformer 202.Fig. 2 show in the sending end MMC201 that is connected of anode and
The situation of a breaker 203 is connected between transformer 202.
As shown in connection with fig. 6, the anode 204 and cathode of bipolar MMC-HVDC transmission system one end (sending end or receiving end)
Between 206 MMC201 respectively connected and transformer 202, it is all connected with a breaker 203, is led between anode 204 and cathode 206
Earthing pole 205 is crossed to connect with the earth.Preferably, MMC201 and transformer that sending end positive and negative anodes and receiving end positive and negative anodes are connected
Between 202, it is all connected with a breaker 203, i.e. the structure of sending end and receiving end all can be structure shown in fig. 6.
Bipolar MMC-HVDC transmission system provided by the embodiment of the present invention, in the valve outlet of MMC and the valve of transformer
Cut-in valve side breaker between the winding of side, the quantity flexibly configurable of valve side breaker.Sending end or receiving end are connected
There is a pole of valve side breaker, when there is valve side singlephase earth fault, discontinuously triggering occurs by the electric current of fault ground point
Valve side breaker disconnects, so that disengagement failure current path, plays the role of protecting system equipment.
Embodiment two
Bipolar MMC-HVDC transmission system provided by one based on the embodiment of the present invention, the embodiment of the present invention two provide
A kind of guard method of bipolar MMC-HVDC transmission system valve side singlephase earth fault, for controlling described in embodiment one kind
Bipolar MMC-HVDC transmission system.Referring to shown in Fig. 7, comprising the following steps:
701, when determining that valve side singlephase earth fault occurs in the pole for being connected with breaker, by sending for a pole of breaking down
The MMC of electric end and receiving end locking, non-faulting pole continues to run.
In a kind of specific embodiment, bipolar MMC-HVDC transmission system includes control protective module, for detecting
Valve side singlephase earth fault.Wherein valve side singlephase earth fault refers between the valve outlet of MMC and the valve side winding of transformer
The singlephase earth fault occurred on alternating current circuit.When control protective module detects that the pole for being connected with valve side breaker occurs
When the singlephase earth fault of valve side, the MMC of failure pole sending end and receiving end is latched, non-faulting pole continues to run.
702, it when determining that valve side singlephase earth fault occurs in the pole for being connected with valve side breaker, is sent out to valve side breaker
Separating brake is sent to instruct.
The quantity of bipolar MMC-HVDC transmission system internal valve side breaker is configurable, can be only in some MMC and transformation
Connection valve side breaker between device can also be all connected with valve side breaker between each MMC and transformer.Control protective module
It can detecte and valve side singlephase earth fault whether occur, and send separating brake to the valve side breaker of failure pole when detecting failure
Instruction.
For example, when sending end anode goes out, and valve side singlephase earth fault occurs, sending end and receiving end is positive
MMC is latched, and the MMC of sending end and receiving end cathode is operated normally.
703, when a phase current of valve side breaker occurs interrupted, breaker, which disconnects, there is an interrupted phase current.
After valve side breaker receives separating brake instruction, disconnected when a phase current occurs interrupted.
The guard method of bipolar MMC-HVDC transmission system valve side singlephase earth fault provided by the embodiment of the present invention,
When valve side singlephase earth fault occurs in the pole for detecting that sending end or receiving end are connected with valve side breaker, to corresponding position
The valve side breaker set sends separating brake instruction, and when occurring interrupted by the electric current of fault ground point, valve side breaker is disconnected, from
And disengagement failure current path, play the role of protecting system equipment.
More than, it is merely preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto, it is any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, such as
Various replacements etc. to transformer in bipolar MMC-HVDC transmission system, should be covered by the protection scope of the present invention.
Protection scope of the present invention should be subject to the protection scope in claims.
Claims (8)
1. a kind of bipolar modules multilevel converter-high voltage direct current MMC-HVDC transmission system, including both ends, respectively power transmission
End and receiving end, the sending end and the receiving end include the two poles of the earth, respectively anode and cathode, the sending end and described
Receiving end is also configured with earthing pole；It is characterized in that,
The MMC that an at least pole of the MMC-HVDC transmission system at least one end is connected, the valve side of valve outlet and transformer
Breaker is connected between winding；When occurring interrupted by a phase current of the breaker, the breaker, which disconnects, to be occurred
An interrupted phase current；
The breaker is a three-phase alternating current breaker, is connected to the three-phase valve outlet of the MMC and the three-phase valve of transformer
Between the winding of side, alternatively, the breaker is three single phase ac breakers, each phase valve for being connected to the MMC goes out
Between line and each phase valve side winding of transformer.
2. MMC-HVDC transmission system according to claim 1, which is characterized in that
The MMC is the MMC using half-bridge submodule topology.
3. MMC-HVDC transmission system according to claim 1, which is characterized in that
The breaker has the ability of split-phase disconnection.
4. MMC-HVDC transmission system according to claim 1-3, which is characterized in that
The transformer be it is following any one:
Single-phase two-winding transformer；
Three-phase two-simulation transformer；
Single-phase three-winding transformer；
Three-phase three-winding transformer.
5. a kind of guard method of bipolar MMC-HVDC transmission system valve side singlephase earth fault is applied to such as claim 1-3
Described in any item MMC-HVDC transmission systems, which is characterized in that the guard method includes:
When determining that valve side singlephase earth fault occurs in the pole for being connected with the breaker, separating brake is sent to the breaker and is referred to
It enables；
When a phase current of the breaker occurs interrupted, the breaker, which disconnects, there is an interrupted phase current.
6. guard method according to claim 5, which is characterized in that the method also includes:
When determining that valve side singlephase earth fault occurs in the pole for being connected with the breaker, by the sending end of a pole that breaks down
It is latched with the MMC of receiving end.
7. guard method according to claim 5, which is characterized in that when the breaker has the ability of split-phase disconnection
When, the breaker, which disconnects, there is an interrupted phase current, comprising:
It only disconnects and an interrupted phase current occurs, other phase currents is kept to be connected；
Or an interrupted phase current will occur and other phase currents disconnect.
8. according to the described in any item guard methods of claim 5-7, which is characterized in that the singlephase earth fault includes:
The singlephase earth fault occurred on alternating current circuit between the valve outlet of MMC and the valve side winding of transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| 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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| 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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| CN107093890B (en) * | 2017-06-02 | 2019-03-08 | 南京南瑞继保电气有限公司 | A kind of flexible direct current converter station internal fault switchgear distribution and sweep-out method |
| 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 |
| CN111224569B (en) * | 2020-02-20 | 2021-01-26 | 浙江大学 | Low full-bridge proportion submodule hybrid MMC and direct current fault processing strategy 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 |
| CN102403886A (en) * | 2011-11-03 | 2012-04-04 | 南方电网科学研究院有限责任公司 | Method for protecting direct current line transient short-circuit fault of modular multiple-level converter |
| 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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| 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 |
| CN102403886A (en) * | 2011-11-03 | 2012-04-04 | 南方电网科学研究院有限责任公司 | Method for protecting direct current line transient short-circuit fault of modular multiple-level converter |
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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 |