CN106300297B - Multiterminal flexible direct current power grid monopole is grounded adaptive reclosing method - Google Patents

Multiterminal flexible direct current power grid monopole is grounded adaptive reclosing method Download PDF

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CN106300297B
CN106300297B CN201610810504.9A CN201610810504A CN106300297B CN 106300297 B CN106300297 B CN 106300297B CN 201610810504 A CN201610810504 A CN 201610810504A CN 106300297 B CN106300297 B CN 106300297B
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failure
fault
reclosing
direct current
grid
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CN106300297A (en
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李斌
何佳伟
戴冬康
李晔
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Tianjin University
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Tianjin University
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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
    • 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
    • H02H3/02—Details
    • H02H3/06—Details with automatic reconnection
    • H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection

Abstract

The invention discloses a kind of multiterminal flexible direct current power grid monopoles to be grounded adaptive reclosing method, this method is directed to based on dc circuit breaker and is based on the typical DC Line Fault isolation scheme of both DC grids of transverter self-cleaning, proposes corresponding reclosing judgment method respectively.This method can prejudge the property that is out of order when failure polar curve road is still in excision state, directly determine whether overlap dc circuit breaker (or dc switch), will not have an adverse effect to rest network.Compared with existing multiterminal flexible direct current power grid reclosing method, effectively prevents it and coincide with caused secondary overvoltage when permanent monopolar grounding fault (when pseudo- bipolar wiring), the impact of secondary overcurrent when bipolar wiring (very) problem.Moreover, this method is applicable in the DC grid of pseudo- bipolar wiring and very bipolar wiring.

Description

Multiterminal flexible direct current power grid monopole is grounded adaptive reclosing method
Technical field
The present invention relates to protecting electrical power system control field, more particularly to a kind of suitable for multiterminal flexible direct current power grid Novel unipolar alternate is grounded adaptive reclosing method.
Background technology
When monopolar grounding fault occurs for overhead transmission line in multiterminal flexible direct current power grid, after cutting off failure polar curve road, remaining net Network remains to continue to run with.It is contemplated that overhead transmission line transient fault probability of happening is higher, needs to configure reclosing method and sentence Disconnected nature of trouble, to ensure quickly overlap removed circuit after failure vanishes in the case of transient fault.
Currently, the monopole ground connection reclosing judgment method configured in multiterminal flexible direct current power grid is usually：In excision failure Circuit simultaneously undergoes the going after free process of a period of time, overlaps dc circuit breaker (or the direct current for being removed faulty line both ends Switch, is specifically dependent upon the fault isolation schemes that power grid is taken).It is fault that the realization of failure pole tension can be established by judgement The judgement of matter：If failure pole can set up normal operating voltage, show that failure has disappeared, is transient fault, overlaps Success；If failure pole still can not set up normal operating voltage, show that fault point still has, is permanent fault, overlaps Failure, carries out Fault Isolation again.
This method is simple and reliable, but when coinciding with permanent monopolar grounding fault, can generate two to DC grid The harm that secondary overvoltage, secondary overcurrent are impacted.It, can be due to the voltage control strategy of DC grid when system is using pseudo- bipolar wiring And DC voltage bias is generated in non-faulting pole and transverter exchange side, to cause secondary overvoltage to impact system；When straight When galvanic electricity net is using very bipolar wiring, then secondary overcurrent harm can be generated due to transverter submodule capacitance secondary discharge.Cause This, it is necessary to design a kind of adaptive reclosing method of multiterminal flexible direct current power grid monopole ground connection that can prejudge nature of trouble.
Invention content
When coinciding with permanent monopolar grounding fault for the reclosing method configured in current multiterminal flexible direct current power grid The problem of secondary overvoltage, secondary overcurrent can be caused to impact to system, the present invention proposes a kind of multiterminal flexible direct current power grid monopole It is grounded adaptive reclosing method, can realize the anticipation of nature of trouble.
The present invention proposes a kind of adaptive reclosing method of multiterminal flexible direct current power grid monopole ground connection, and this method is directed to base In dc circuit breaker and it is based on the typical DC Line Fault isolation scheme of both DC grids of transverter self-cleaning, is proposed respectively Corresponding reclosing judgment method, is as follows：
1, when DC grid, which is based on dc circuit breaker, realizes Fault Isolation, monopole is grounded the judgement packet of adaptive reclosing Include following steps：
It is real according to protection signal tripping failure polar curve road both ends dc circuit breaker after step 1, generation monopolar grounding fault The excision on existing failure polar curve road.It should be noted that non-faulting pole extremely corresponding with failure is without being removed.
Step 2, experience remove the delay Δ t of free process1After, measure failure pole line-to-earth voltage Uf；
Step 3, by failure pole tension UfJudge setting valve U with reclosingsetIt is compared：According to electrostatic between transmission line of electricity Principle of induction, if Uf>Uset, the failure is judged for transient fault, in delay Δ t2After overlap dc circuit breaker；If Uf<Uset, Judge the failure for permanent fault, misaligned dc circuit breaker；
(2), when DC grid, which is based on transverter self-cleaning, realizes Fault Isolation, monopole is grounded sentencing for adaptive reclosing It is disconnected to include the following steps：
Step 1 after monopolar grounding fault occurs, is latched each transverter in DC grid, realizes the clear of fault current immediately Except (when current conversion station is very bipolar wiring, each current conversion station only needs locking failure extremely to correspond to transverter, and non-faulting extremely corresponds to the change of current Device still maintains normal operation)；
After step 2, removing fault current, according to the fast-speed direct current at the protection signal tripping failure polar curve road both ends received Switch realizes the physical isolation on failure polar curve road；Equally, non-faulting corresponding with failure polar curve road pole is without excision；
Bu Zhou <3>, unlock DC grid in all transverters, restore continuing to run with for rest network；
Bu Zhou <4>, experience remove the delay Δ t of free process1After, measure failure pole line-to-earth voltage Uf；
Step 5, by failure pole tension UfJudge setting valve U with reclosingsetIt is compared：According to electrostatic between transmission line of electricity Principle of induction, if Uf>Uset, the failure is judged for transient fault, in delay Δ t2After overlap dc switch；If Uf<Uset, sentence The fixed failure is permanent fault, misaligned dc switch.
Propose threshold value U in above-mentioned reclosing judgment methodsetSynchronizing calculation method.Specific Principles are：If fault point It always exists, removed failure pole line voltage distribution will be always by fault point clamper near 0 value；If fault point has disappeared, Removed failure polar curve road will be induced due to electrostatic induction still in perfecting under pole acts on for charging operation state Certain voltage (this is also the cardinal principle of adaptive reclosing method proposed by the present invention).Accordingly, the present invention is proposed such as formula (1) U shown insetSynchronizing calculation method；
In above formula, UhealthFor non-faulting pole working voltage over the ground；K is safety factor, is generally taken as 5~10；α21、α11Point The mutual coefficient of potential of two interpolars and non-faulting pole self-potential coefficient are not represented, its calculation formula point can be obtained according to electrostatic field correlation theory Not as shown in formula (2)~(3).
In above formula, ε0For permittivity of vacuum, 8.85 × 10 are generally taken-9F/km；L is overhead transmission line length；H is overhead line Road distance to the ground；D distances between positive and negative anodes；R0For overhead transmission line radius.
Compared with prior art, the monopole that the present invention designs is grounded adaptive reclosing judgment method and passes through to being in excision The measurement of status fault polar curve road residual voltage size is compared, and can just be prejudged and is out of order when failure pole is still in excision state Property.Thoroughly avoiding existing reclosing method, to coincide with the secondary overvoltage generated when permanent monopolar grounding fault (pseudo- bipolar When wiring), secondary overcurrent endanger when bipolar wiring (very).Moreover, equal to the DC grid of pseudo- bipolar wiring and very bipolar wiring It is applicable in.
Description of the drawings
Fig. 1 is multiterminal flexible direct current power grid monopolar grounding fault schematic diagram；
Fig. 2 is that the multiterminal flexible direct current power grid of the present invention realizes that monopole when Fault Isolation is grounded certainly based on dc circuit breaker Adapt to reclosing method logic diagram；
Fig. 3 is that the multiterminal flexible direct current power grid of the present invention realizes that monopole when Fault Isolation is grounded based on transverter self-cleaning Adaptive reclosing method logic diagram.
Specific implementation mode
Invention is further described in detail with reference to the accompanying drawings and embodiments.The embodiment is according to the technology of the present invention side Case is implemented, and gives detailed specific embodiment and operating process, but the application range of the present invention is not limited to following realities Apply example.
As shown in Figure 1, for multiterminal flexible direct current power grid monopolar grounding fault schematic diagram in embodiment, specially four ends are pseudo- double The flexible direct current topological structure of electric of pole wiring.
When DC grid realizes Fault Isolation using dc circuit breaker, the adaptive reclosing method tool of monopolar grounding fault Body implementation steps are as shown in Figure 2：
Step 1-1, after generation monopolar grounding fault (abort situation is as shown in fig. 1), believed according to the protection received Number corresponding dc circuit breaker S in tripping failure polar curve road both ends1、S2(with failure extremely corresponding non-faulting pole both ends dc circuit breaker S3、S4Without implementing trip operation), hereafter rest network can restore normal operation.
Step 1-2, delay 150ms ensures that circuit is gone after dissociating, and measures line-to-ground electricity in position failure pole shown in Fig. 1 Press Uf。
Step 1-3, by failure pole tension UfWith setting valve UsetIt is compared：
According to electrostatic induction principle between transmission line of electricity, if Uf>Uset, show that residual voltage occurs in circuit, fault point has disappeared It loses, judges the failure for transient fault, after delay 10ms (ensuring that failure polar curve road opposite end also completes reclosing and judges) Overlap dc circuit breaker；
If Uf<Uset, show that circuit residual voltage very little, fault point still have, judge that the failure for permanent fault, does not weigh Close dc circuit breaker.
When DC grid, which is based on transverter self-cleaning, realizes Fault Isolation, all current conversion stations, which must use, has failure certainly The transverter of Scavenging activity.The adaptive reclosing of monopolar grounding fault judges that specific implementation step is as shown in Figure 3：
Step 2-1, it is latched all transverters in DC grid immediately after monopolar grounding fault occurring, realizes fault current It removes.It should be noted that when current conversion station is very bipolar wiring, each current conversion station only needs locking failure extremely to correspond to transverter, and Non-faulting extremely corresponds to transverter and still maintains normal operation.
Step 2-2, after measuring fault current and having reset, according to the protection signal tripping failure polar curve road received The fast-speed direct current switch S at both ends1、S2(with failure extremely corresponding non-faulting pole both ends dc switch S3、S4It is dynamic without implementing tripping Make).
Step 2-3, all transverters in DC grid are unlocked, realize continuing to run with for rest network.
Step 2-4, delay 150ms ensures that circuit is gone after dissociating, and measures line-to-ground electricity in position failure pole shown in Fig. 1 Press Uf。
Step 2-5, by failure pole tension UfWith setting valve UsetIt is compared：
According to electrostatic induction principle between transmission line of electricity, if Uf>Uset, show that residual voltage occurs in circuit, fault point has disappeared It loses, judges the failure for transient fault, (ensure that failure polar curve road opposite end also completes reclosing judgement) after the 10ms that is delayed After overlap dc switch；
If Uf<Uset, show that circuit residual voltage very little, fault point still have, judge that the failure for permanent fault, does not weigh Close dc switch.
U among the abovesetIt can be calculated according to formula (1)~(3), and in conjunction with DC grid overhead transmission line parameter, the present embodiment Middle k takes 10.

Claims (1)

1. a kind of multiterminal flexible direct current power grid monopole is grounded adaptive reclosing method, which is characterized in that this method is directed to and is based on Dc circuit breaker and be based on the typical DC Line Fault isolation scheme of both DC grids of transverter self-cleaning, propose phase respectively The reclosing judgment method answered, is as follows：
When DC grid, which is based on dc circuit breaker, realizes Fault Isolation, the judgement that monopole is grounded adaptive reclosing includes following Step：
Step (1) after monopolar grounding fault occurs, according to protection signal tripping failure polar curve road both ends dc circuit breaker, is realized The excision on failure polar curve road, non-faulting pole extremely corresponding with failure is without being removed；
Step (2), experience remove the delay Δ t of free process1After, measure failure pole line-to-earth voltage Uf；
Step (3), by failure pole tension UfJudge setting valve U with reclosingsetIt is compared：If Uf>Uset, judge that the failure is Transient fault, in delay Δ t2After overlap dc circuit breaker；If Uf<Uset, judge the failure for permanent fault, it is misaligned straight Flow breaker；
When DC grid, which is based on transverter self-cleaning, realizes Fault Isolation, judgement that monopole is grounded adaptive reclosing include with Lower step：
Step (1) after monopolar grounding fault occurs, is latched each transverter in DC grid, realizes the removing of fault current immediately, When current conversion station is very bipolar wiring, each current conversion station only needs locking failure extremely to correspond to transverter, and non-faulting extremely corresponds to transverter Still maintain normal operation；
Step (2) after removing fault current, is opened according to the fast-speed direct current at the protection signal tripping failure polar curve road both ends received It closes, realizes the physical isolation on failure polar curve road；Equally, non-faulting pole extremely corresponding with failure is not removed；
All transverters in step (3), unlock DC grid, restore continuing to run with for rest network；
Step (4), experience remove the delay Δ t of free process1After, measure failure pole line-to-earth voltage Uf；
Step (5), by failure pole tension UfJudge setting valve U with reclosingsetIt is compared：If Uf>Uset, judge that the failure is Transient fault, in delay Δ t2After overlap dc switch；If Uf<Uset, judge the failure for permanent fault, misaligned direct current Switch；
Wherein, reclosing judges setting valve UsetIt is calculated according to electrostatic induction principle, adaptive setting formula (1) is as follows；
Wherein, UhealthFor non-faulting pole working voltage over the ground；K is safety factor；α21、α11Respectively represent the mutual current potential system of two interpolars Number and non-faulting pole self-potential coefficient, calculation formula is respectively as shown in formula (2)~(3)：
Wherein, ε0For permittivity of vacuum；L is overhead transmission line length；H is overhead transmission line distance to the ground；D distances between positive and negative anodes； R0For overhead transmission line radius.
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