CN108333474B

CN108333474B - A kind of the delay method of discrimination and system of the fault direction of bus circuit

Info

Publication number: CN108333474B
Application number: CN201810071308.3A
Authority: CN
Inventors: 董新洲; 景柳铭; 官二勇; 王宾; 王豪; 周建华; 何泽家
Original assignee: Tsinghua University; State Grid Shanghai Electric Power Co Ltd; Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Current assignee: Tsinghua University; State Grid Shanghai Electric Power Co Ltd; Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Priority date: 2018-01-25
Filing date: 2018-01-25
Publication date: 2019-11-22
Anticipated expiration: 2038-01-25
Also published as: CN108333474A

Abstract

The present invention provides the delay method of discrimination and system of a kind of fault direction of bus circuit, a kind of computer equipment and a kind of computer readable storage mediums, method includes: to obtain the phase voltage and phase current of each phase in D.C. high voltage transmission inverter side ac bus circuit, and calculate the sequence voltage of bus circuit, sequence electric current and three phase power；Judge that failure then generates corresponding fault-signal if it exists with the presence or absence of failure in bus circuit according to phase voltage and sequence voltage；After generating fault-signal, the direction of the fault component of delay acquisition sequence voltage, sequence failure of the current component and three phase power；Occurred that the opposite direction in bus circuit occurs in the positive direction or failure of bus circuit according to the walking direction failure of fault-signal, the fault component of sequence voltage, sequence failure of the current component and three phase power; the case where not will receive the influence that transient power is swung to, and then avoiding protection system malfunction generation.

Description

A kind of the delay method of discrimination and system of the fault direction of bus circuit

Technical field

The present invention relates to direct current transportation field, the delay in particular to a kind of fault direction of bus circuit differentiates Method, a kind of delay judgement system of the fault direction of bus circuit, a kind of computer equipment and a kind of computer-readable storage Medium.

Background technique

Currently, in the related art, high pressure and ultra high voltage ac line common configuration Unit protection, when receiving end electricity When AC fault occurs for net, DC control system quick response can be caused, disturbance caused by the AC fault of receiving end power grid at this time There may be the replacement of leading disturbance with disturbance caused by DC control system quick response, i.e., DC control system is fast The caused disturbance of speed response may become leading disturbance.Judge that the back side fault in ac transmission system of equipment causes with fault direction Forward dc system disturbance for, with back side failure be in failure it is leading, should be determined as reverse fault at this time, and work as direct current control System quick response processed can be determined as positive failure, i.e., in the case where causing direct current system disturbance even more serious than back side failure There is transient power to swing to, the protection system of respective direction just will appear malfunction.

Summary of the invention

The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.

For this purpose, the first aspect of the present invention proposes a kind of delay method of discrimination of the fault direction of bus circuit.

The second aspect of the present invention proposes a kind of delay judgement system of the fault direction of bus circuit.

The third aspect of the present invention proposes a kind of computer equipment.

The fourth aspect of the present invention proposes a kind of computer readable storage medium.

In view of this, the first aspect of the present invention provides a kind of delay method of discrimination of the fault direction of bus circuit, Include: the phase voltage and phase current of each phase in the bus circuit for obtain the exchange of D.C. high voltage transmission inverter side, and calculates bus electricity Sequence voltage, sequence electric current and the three phase power on road；Judged according to phase voltage and sequence voltage with the presence or absence of failure in bus circuit, if depositing Corresponding fault-signal is then generated in failure；After generating fault-signal, the fault component of delay acquisition sequence voltage, sequence electric current The direction of fault component and three phase power；According to fault-signal, the fault component of sequence voltage, sequence failure of the current component and three-phase The walking direction failure of power occurs that the opposite direction in bus circuit occurs in the positive direction or failure of bus circuit.

In the technical scheme, to the phase voltage of each phase in the bus circuit of D.C. high voltage transmission inverter side exchange and mutually electricity Stream is sampled, and the sequence voltage, sequence electric current and three phase power of bus circuit are calculated separately, when in bus circuit there are when failure, The phase voltage of failure phase can decline, and corresponding sequence voltage can rise, according to the phase voltage of phase each in bus circuit and sequence voltage Variation accurately judges that there are failures for any phase or multiphase in bus circuit, after determining that failure occurs, according to failure phase The variable quantity of phase voltage and sequence voltage, it may be determined that the fault type of failure phase simultaneously generates corresponding fault-signal；Believed according to failure Number and sequence voltage, the phase angle difference of sequence electric current and three phase power direction can judge D.C. high voltage transmission inverter side exchange Bus circuit in there are the direction of failure, this method is delayed by sequence voltage to phase each in bus circuit and sequence electric current It obtains, sampled data shields disturbance caused by DC control system quick response, and then not will receive transient power and swing to Influence, and then generation the case where avoid protection system malfunction increases power grid fortune so that electric network protection system reliability is higher Capable stability.

In addition, the delay method of discrimination of the fault direction of the bus circuit in above-mentioned technical proposal provided by the invention may be used also With following additional technical feature:

In the above-mentioned technical solutions, it is preferable that fault component, the sequence failure of the current component and three of delay acquisition sequence voltage The direction of phase power, and the side according to fault-signal, the fault component of sequence voltage, sequence failure of the current component and three phase power To judge failure occur in the positive direction of bus circuit or the opposite direction of bus circuit, specifically include: when fault-signal be it is single-phase Residual voltage failure point when earth-fault signal or double earthfault signal, in the fault component of delay acquisition sequence voltage Amount, and the zero-sequence current fault component in delay acquisition sequence failure of the current component；When residual voltage fault component lags behind zero When sequence current failure component, judge that the positive direction in bus circuit occurs for failure；When residual voltage fault component is ahead of zero sequence When current failure component, judge that the opposite direction in bus circuit occurs for failure.

In the technical scheme, when single-phase earthing or double earthfault occur in bus circuit, zero is obtained after delay Sequence voltage fault component and zero-sequence current fault component, when residual voltage fault component lags behind zero-sequence current fault component, That is the phase angle of zero-sequence current fault component can determine that failure occurs in bus greater than the phase angle of residual voltage fault component at this time The positive direction of circuit；When residual voltage fault component is ahead of zero-sequence current fault component, i.e. residual voltage fault component Phase angle is greater than the phase angle of zero-sequence current, then can determine that the opposite direction in bus circuit occurs for failure.

In any of the above-described technical solution, it is preferable that fault component, the sequence failure of the current component of delay acquisition sequence voltage With the direction of three phase power, and according to fault-signal, the fault component of sequence voltage, sequence failure of the current component and three phase power Walking direction failure occur in the positive direction of bus circuit or the opposite direction of bus circuit, further includes: when fault-signal be two When phase short circuit fault signal, negative sequence voltage fault component in the fault component of delay acquisition sequence voltage, and delay acquisition sequence electricity Negative-sequence current fault component in the fault component of stream；When negative sequence voltage fault component lags behind negative-sequence current fault component, Judge that the positive direction in bus circuit occurs for failure；When negative sequence voltage fault component is ahead of negative-sequence current fault component, sentence Opposite direction in bus circuit occurs for disconnected failure.

In the technical scheme, when two-phase short-circuit fault occurs in bus circuit, negative sequence voltage failure is obtained after delay Component and negative-sequence current fault component, when negative sequence voltage fault component lags behind negative-sequence current fault component, i.e. negative-sequence current The phase angle of fault component is greater than the phase angle of negative sequence voltage fault component, can determine that the pros in bus circuit occur for failure at this time To；When negative sequence voltage fault component is ahead of negative-sequence current fault component, i.e., the phase angle of negative sequence voltage fault component is greater than negative The phase angle of sequence electric current can then determine that the opposite direction in bus circuit occurs for failure.

In any of the above-described technical solution, it is preferable that fault component, the sequence failure of the current component of delay acquisition sequence voltage With the direction of three phase power, and according to fault-signal, the fault component of sequence voltage, sequence failure of the current component and three phase power Walking direction failure occur in the positive direction of bus circuit or the opposite direction of bus circuit, further includes: when fault-signal be three When phase fault signal, the direction of delay acquisition three phase power；When the direction of three phase power be timing, judge failure occur in bus The positive direction of circuit；When the direction of three phase power is negative, judge that the opposite direction in bus circuit occurs for failure.

In the technical scheme, when three-phase fault occurs in bus circuit, the direction of three phase power is obtained after delay, when The direction of three phase power is positive, i.e., when three phase power is positive value, determines that the positive direction in bus circuit occurs for failure；When three-phase function The direction of rate is negative, i.e., when three phase power is negative value, determines that the opposite direction in bus circuit occurs for failure.

By carrying out delay post-sampling to the sequence voltage in circuit, sequence electric current and three phase power, DC control can be shielded Disturbance caused by system quick response, and then not will receive the influence that transient power is swung to, and then avoid protection system mistake Dynamic situation occurs, so that electric network protection system reliability is higher, increases the stability of operation of power networks.

In any of the above-described technical solution, it is preferable that judge to whether there is in bus circuit according to phase voltage and sequence voltage Failure, specifically: when single-phase circuit in bus circuit phase voltage be lower than the first phase voltage threshold value, and residual voltage be higher than zero sequence When voltage threshold, judge that ground fault occurs in single-phase circuit；Or when the phase voltage of in bus circuit quarter-phase circuit is below Second phase voltage threshold value, and when negative sequence voltage is above negative sequence voltage threshold value, judge that double earthfault occurs in quarter-phase circuit Or two-phase short-circuit fault；Or when the phase voltage of three-phase circuit is below third phase voltage threshold, judge that three-phase fault occurs.

In the technical scheme, phase voltage threshold value and sequence voltage threshold value are set, sample the phase voltage of each phase in bus circuit, Sequence voltage can determine this when single phase voltage is lower than the first phase voltage threshold value, and residual voltage is higher than residual voltage threshold value Singlephase earth fault mutually has occurred；When the phase voltage for appointing two-phase while being lower than the second phase voltage threshold value, and negative sequence voltage is higher than negative When sequence voltage threshold value, it can determine that line to line fault or double earthfault has occurred in the two-phase；When the phase voltage of three-phase is below When third phase voltage threshold, it can determine and three-phase fault has occurred；This method only need to the phase voltage of phase each in bus circuit and Sequence voltage, which carries out sampling, whether there is failure in decision circuitry, and determines fault type, and method is simple, be easy to implement, Wherein the first phase voltage threshold value, the second phase voltage threshold value, third phase voltage threshold, residual voltage threshold value and negative sequence voltage threshold value can According to the actual conditions of different power grids, it is set as suitable specific value for different power grids.

In any of the above-described technical solution, it is preferable that the judging result of fault direction exports after being delayed.

In the technical scheme, the judging result of fault direction exports after being delayed, and during the delay process, systems stay is adopted The phase voltage of each phase, sequence voltage, sequence electric current and three phase power in sample circuit, such as phase voltage of each phase, sequence voltage, sequence electric current and three The case where phase power changes, and judging result also accordingly changes at this time, further avoids protection system malfunction generation, so that Electric network protection system reliability is higher, increases the stability of operation of power networks.

Second aspect of the present invention provides a kind of delay judgement system of the fault direction of bus circuit, comprising: calculates mould Block, breakdown judge module, delay sampling module and fault direction judgment module；Computing module is inverse for obtaining D.C. high voltage transmission Become the phase voltage and phase current of each phase in the bus circuit of top-cross stream, and calculates the sequence voltage of bus circuit, sequence electric current and three-phase Power；Breakdown judge module is used to be judged according to phase voltage and sequence voltage to whether there is failure in bus circuit, if it exists failure Then generate corresponding fault-signal；The sampling module that is delayed is used for after generating fault-signal, the failure point of delay acquisition sequence voltage The direction of amount, sequence failure of the current component and three phase power；Fault direction judgment module is used for according to fault-signal, sequence voltage Positive direction or failure in bus circuit occurs for the walking direction failure of fault component, sequence failure of the current component and three phase power The opposite direction in bus circuit occurs.

In the technical scheme, to the phase voltage of each phase in the bus circuit of D.C. high voltage transmission inverter side exchange and mutually electricity Stream is sampled, and the sequence voltage, sequence electric current and three phase power of bus circuit are calculated separately, when in bus circuit there are when failure, The phase voltage of failure phase can decline, and corresponding sequence voltage can rise, according to the phase voltage of phase each in bus circuit and sequence voltage Variation can accurately judge that there are failures for any phase or multiphase in bus circuit, after determining that failure occurs, according to failure phase Phase voltage and sequence voltage variable quantity, it may be determined that the fault type of failure phase simultaneously generates corresponding fault-signal；According to failure The direction of signal and sequence voltage, the phase angle difference of sequence electric current and three phase power can judge D.C. high voltage transmission inversion top-cross There are the fault direction of failure in the bus circuit of stream, this method by sequence voltage to phase each in bus circuit and sequence electric current into Line delay obtains, and sampled data shields disturbance caused by DC control system quick response, and then not will receive transient state function The influence that rate is swung to, and then generation the case where avoid protection system malfunction increase so that electric network protection system reliability is higher The stability of operation of power networks.

In the above-mentioned technical solutions, it is preferable that delay sampling module further include: the first delay sampling submodule；Failure side To judgment module further include: Fisrt fault walking direction submodule；First delay sampling submodule is used to when fault-signal be single Residual voltage failure point when phase earth-fault signal or double earthfault signal, in the fault component of delay acquisition sequence voltage Amount, and the zero-sequence current fault component in delay acquisition sequence failure of the current component；Fisrt fault walking direction submodule is used for When residual voltage fault component lags behind zero-sequence current fault component, judge that the positive direction in bus circuit occurs for failure；When When residual voltage fault component is ahead of zero-sequence current fault component, judge that the opposite direction in bus circuit occurs for failure.

In any of the above-described technical solution, it is preferable that delay sampling module further include: the second delay sampling submodule；Therefore Hinder walking direction module further include: the second fault direction judging submodule；Second delay sampling submodule is for working as fault-signal When for two-phase short-circuit fault signal, negative sequence voltage fault component in the fault component of delay acquisition sequence voltage, and delay acquisition Negative-sequence current fault component in sequence failure of the current component；Second fault direction judging submodule is used to work as negative sequence voltage failure When component lags behind negative-sequence current fault component, judge that the positive direction in bus circuit occurs for failure；When negative sequence voltage failure point When amount is ahead of negative-sequence current fault component, judge that the opposite direction in bus circuit occurs for failure.

In any of the above-described technical solution, it is preferable that delay sampling module further include: third delay sampling submodule；Therefore Hinder walking direction module further include: third fault direction judging submodule；Third delay sampling submodule is for working as fault-signal When for three-phase fault signal, the direction of delay acquisition three phase power；Third fault direction judging submodule is for working as three phase power Direction be timing, judge failure occur bus circuit positive direction；When the direction of three phase power is negative, judge that failure is sent out The raw opposite direction in bus circuit.

In any of the above-described technical solution, it is preferable that breakdown judge module is specifically used for: when single-phase circuit in bus circuit Phase voltage be lower than the first phase voltage threshold value, and residual voltage be higher than residual voltage threshold value when, judge to connect in single-phase circuit Earth fault；Or when appointing the phase voltage of quarter-phase circuit to be below the second phase voltage threshold value in bus circuit, and negative sequence voltage is above When negative sequence voltage threshold value, judge that double earthfault or two-phase short-circuit fault occur in quarter-phase circuit；Or the phase when three-phase circuit When voltage is below third phase voltage threshold, judge that three-phase fault occurs.

In the technical scheme, phase voltage threshold value and sequence voltage threshold value are set, sample the phase voltage of each phase in bus circuit, Sequence voltage can determine this when single phase voltage is lower than the first phase voltage threshold value, and residual voltage is higher than residual voltage threshold value Singlephase earth fault mutually has occurred；When the phase voltage for appointing two-phase while being lower than the second phase voltage threshold value, and sequence voltage is higher than negative phase-sequence When voltage threshold, it can determine that line to line fault or double earthfault has occurred in the two-phase；When the phase voltage of three-phase is all lower than When third phase voltage threshold, it can determine and three-phase fault has occurred in route；This method only needs the phase to phase each in bus circuit Voltage and sequence voltage, which carry out sampling, whether there is failure in decision circuitry, and determine fault type, and method is simple, is easy Implement, wherein the first phase voltage threshold value, the second phase voltage threshold value, third phase voltage threshold, residual voltage threshold value and negative sequence voltage Threshold value can be set as suitable specific value for different power grids according to the actual conditions of different power grids.

Third fermentation of the invention provides a kind of computer equipment, including memory, processor and is stored in described deposit On reservoir and the computer program that can run on the processor；The processor is realized such as when executing the computer program The delay method of discrimination of the fault direction of bus circuit described in any of the above-described technical solution, therefore, which includes Whole beneficial effects of the delay method of discrimination of the fault direction of bus circuit described in any of the above-described technical solution.

The fourth aspect of the present invention provides a kind of computer readable storage medium, is stored thereon with computer program, institute State prolonging for the fault direction that the bus circuit as described in any of the above-described technical solution is realized when computer program is executed by processor When method of discrimination, therefore, which includes the failure of bus circuit described in any of the above-described technical solution Whole beneficial effects of the delay method of discrimination in direction.

Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description Obviously, or practice through the invention is recognized.

Detailed description of the invention

Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures Obviously and it is readily appreciated that, in which:

Fig. 1 shows the stream of the delay method of discrimination of the fault direction of bus circuit according to an embodiment of the invention Cheng Tu；

Fig. 2 shows the delay method of discrimination of the fault direction of bus circuit according to another embodiment of the invention Flow chart；

Fig. 3 shows the zero of the delay method of discrimination of the fault direction of bus circuit according to an embodiment of the invention The angle relationship figure of sequence electric current and residual voltage；

Fig. 4 shows the zero of the delay method of discrimination of the fault direction of bus circuit according to an embodiment of the invention The waveform diagram of sequence electric current and residual voltage；

Fig. 5 shows the delay method of discrimination of the fault direction of the bus circuit of still another embodiment in accordance with the present invention Flow chart；

Fig. 6 shows the delay method of discrimination of the fault direction of the bus circuit of still another embodiment in accordance with the present invention Flow chart；

Fig. 7 shows the delay method of discrimination of the fault direction of the bus circuit of still another embodiment in accordance with the present invention Flow chart；

Fig. 8 shows the delay method of discrimination of the fault direction of the bus circuit of still another embodiment in accordance with the present invention Flow chart；

Fig. 9 shows the delay method of discrimination of the fault direction of the bus circuit of still another embodiment in accordance with the present invention Flow chart；

Figure 10 shows the delay judgement system of the fault direction of bus circuit according to an embodiment of the invention Block diagram；

Figure 11 shows the delay judgement system of the fault direction of bus circuit according to another embodiment of the invention Block diagram；

Figure 12 shows the delay judgement system of the fault direction of bus circuit according to another embodiment of the invention Block diagram；

Figure 13 shows the delay judgement system of the fault direction of bus circuit according to another embodiment of the invention Block diagram；

Figure 14 shows the delay judgement system of the fault direction of bus circuit according to an embodiment of the invention Fault point schematic diagram；

Figure 15 shows the delay judgement system of the fault direction of bus circuit according to an embodiment of the invention Each phase voltage waveform figure of line fault.

Specific embodiment

To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application Feature in example and embodiment can be combined with each other.

In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below Specific embodiment limitation.

The delay of the fault direction of the bus circuit described according to some embodiments of the invention is described referring to Fig. 1 to Figure 15 Method of discrimination, bus circuit fault direction delay judgement system, computer equipment and computer readable storage medium.

As shown in Figure 1, the present invention provides a kind of failure sides of bus circuit in the embodiment of first aspect present invention To delay method of discrimination, comprising: S102, obtain D.C. high voltage transmission inverter side exchange bus circuit in each phase phase voltage And phase current, and calculate the sequence voltage of bus circuit, sequence electric current and three phase power；S104 judges according to phase voltage and sequence voltage It whether there is failure in bus circuit, failure then generates corresponding fault-signal if it exists；S106, after generating fault-signal, The direction of the fault component of delay acquisition sequence voltage, sequence failure of the current component and three phase power；S108, according to fault-signal, Pros in bus circuit occur for the walking direction failure of the fault component of sequence voltage, sequence failure of the current component and three phase power To or failure occur bus circuit opposite direction.

In this embodiment, to the phase voltage and phase current of each phase in the bus circuit of D.C. high voltage transmission inverter side exchange Sampled, calculate separately the sequence voltage, sequence electric current and three phase power of bus circuit, when in bus circuit there are when failure, therefore The phase voltage of barrier phase can decline, and corresponding sequence voltage can rise, according to the change of the phase voltage of phase each in bus circuit and sequence voltage Change can accurately judge that there are failures for any phase or multiphase in bus circuit, after determining that failure occurs, according to failure phase The variable quantity of phase voltage and sequence voltage, it may be determined that the fault type of failure phase simultaneously generates corresponding fault-signal；Believed according to failure Number and sequence voltage, the phase angle difference of sequence electric current and three phase power direction can judge D.C. high voltage transmission inverter side exchange Bus circuit in there are the fault direction of failure, this method is carried out by sequence voltage to phase each in bus circuit and sequence electric current Delay acquisition, sampled data shields disturbance caused by DC control system quick response, and then not will receive transient power The influence swung to, and then generation the case where avoid protection system malfunction increase electricity so that electric network protection system reliability is higher Net the stability of operation.

In one embodiment of the invention, it is preferable that as shown in Figures 2 to 4, the delay of the fault direction of bus circuit Method of discrimination, comprising: S202, obtain D.C. high voltage transmission inverter side exchange bus circuit in each phase phase voltage and mutually electricity Stream, and calculate the sequence voltage of the bus circuit, sequence electric current and three phase power；S204 judges female according to phase voltage and sequence voltage It whether there is failure in line circuit, failure then generates corresponding fault-signal if it exists；S206, when fault-signal is single-phase earthing When fault-signal or double earthfault signal, residual voltage fault component in the fault component of delay acquisition sequence voltage, and Zero-sequence current fault component in delay acquisition sequence failure of the current component；S208, when residual voltage fault component lags behind zero When sequence current failure component, judge that the positive direction in bus circuit occurs for failure；S210, when residual voltage fault component is ahead of When zero-sequence current fault component, judge that the opposite direction in bus circuit occurs for failure.

When single-phase earthing occurs in bus circuit or obtained when double earthfault, after delay residual voltage fault component and Zero-sequence current fault component, when residual voltage fault component lags behind zero-sequence current fault component, as shown in figure 3, i.e. zero sequence The phase angle of current failure component is greater than the phase angle of residual voltage fault component, can determine that failure occurs in bus circuit at this time Positive direction；When residual voltage fault component is ahead of zero-sequence current fault component, as shown in figure 4, the waveform of residual voltage is super The preceding waveform with zero-sequence current can then determine that the opposite direction in bus circuit occurs for failure.

In one embodiment of the invention, it is preferable that as shown in figure 5, the delay of the fault direction of bus circuit differentiates Method, comprising: S302 obtains the phase voltage and phase current of each phase in the bus circuit of D.C. high voltage transmission inverter side exchange, and Calculate the sequence voltage, sequence electric current and three phase power of the bus circuit；S304 judges bus circuit according to phase voltage and sequence voltage In whether there is failure, failure then generates corresponding fault-signal if it exists；S306, when fault-signal is two-phase short-circuit fault letter Number when, the negative sequence voltage fault component in the fault component of delay acquisition sequence voltage, and delay acquisition sequence failure of the current component In negative-sequence current fault component；S308 judges failure when negative sequence voltage fault component lags behind negative-sequence current fault component The positive direction in bus circuit occurs；S310 judges event when negative sequence voltage fault component is ahead of negative-sequence current fault component Opposite direction in bus circuit occurs for barrier.

Negative sequence voltage fault component and negative-sequence current event are obtained when two-phase short-circuit fault occurs in bus circuit, after delay Hinder component, when negative sequence voltage fault component lags behind negative-sequence current fault component, i.e. the phase angle of negative-sequence current fault component is big In the phase angle of negative sequence voltage fault component, it can determine that the positive direction in bus circuit occurs for failure at this time；When negative sequence voltage event Barrier component is when being ahead of negative-sequence current fault component, i.e. the phase angle of the negative sequence voltage fault component phase angle that is greater than negative-sequence current, then It can determine that the opposite direction in bus circuit occurs for failure.

In one embodiment of the invention, it is preferable that as shown in fig. 6, the delay of the fault direction of bus circuit differentiates Method, comprising: S402 obtains the phase voltage and phase current of each phase in the bus circuit of D.C. high voltage transmission inverter side exchange, and Calculate the sequence voltage, sequence electric current and three phase power of the bus circuit；S404 judges bus circuit according to phase voltage and sequence voltage In whether there is failure, failure then generates corresponding fault-signal if it exists；S406, when fault-signal is three-phase fault signal When, the direction of delay acquisition three phase power；S408, when the direction of three phase power be timing, judge failure occur in bus circuit Positive direction；S410 judges that the opposite direction in bus circuit occurs for failure when the direction of three phase power is negative.

When three-phase fault occurs in bus circuit, the direction of three phase power is obtained after delay, when the direction of three phase power It is positive, i.e., when three phase power is positive value, determines that the positive direction in bus circuit occurs for failure；When the direction of three phase power is negative, When i.e. three phase power is negative value, determine that the opposite direction in bus circuit occurs for failure.

In one embodiment of the invention, it is preferable that as shown in fig. 7, the delay of the fault direction of bus circuit differentiates Method, comprising: S502 obtains the phase voltage and phase current of each phase in the bus circuit of D.C. high voltage transmission inverter side exchange, and Calculate sequence voltage, sequence electric current and the three phase power of bus circuit；S504, when the phase voltage of single-phase circuit in bus circuit is lower than the One phase voltage threshold value, and residual voltage be higher than residual voltage threshold value when, judge that ground fault occurs in single-phase circuit, and generate therefore Hinder signal；S506, after generating fault-signal, fault component, sequence failure of the current component and the three-phase of delay acquisition sequence voltage The direction of power；S508, according to the side of fault-signal, the fault component of sequence voltage, sequence failure of the current component and three phase power To judge failure occur bus circuit positive direction or failure occur bus circuit opposite direction.

Phase voltage threshold value and sequence voltage threshold value are set, samples the phase voltage of each phase, sequence voltage in bus circuit, works as single-phase Voltage be lower than the first phase voltage threshold value, and residual voltage be higher than residual voltage threshold value when, can determine that single-phase connect mutually has occurred in this Earth fault；Whether this method only needs to sample the phase voltage and sequence voltage of phase each in bus circuit and can deposit in decision circuitry In failure, and determine fault type, method is simple, be easy to implement, wherein the first phase voltage threshold value, the second phase voltage threshold value, Third phase voltage threshold, residual voltage threshold value can be according to the actual conditions of different power grids, for different electricity from negative sequence voltage threshold value Net is set as suitable specific value.

Or as shown in figure 8, the fault direction of bus circuit delay method of discrimination, comprising: S602, obtain high-voltage dc transmission The phase voltage and phase current of each phase in the bus circuit of electric inverter side exchange, and calculate the sequence voltage of bus circuit, sequence electric current and Three phase power；S604, when appointing the phase voltage of quarter-phase circuit to be below the second phase voltage threshold value in bus circuit, and negative sequence voltage is equal When higher than negative sequence voltage threshold value, judge that double earthfault or two-phase short-circuit fault occur in quarter-phase circuit, and generates failure letter Number；S606, after generating fault-signal, fault component, sequence failure of the current component and the three phase power of delay acquisition sequence voltage Direction；S608 sentences according to the direction of fault-signal, the fault component of sequence voltage, sequence failure of the current component and three phase power Disconnected failure occurs that the opposite direction in bus circuit occurs in the positive direction or failure of bus circuit.

Phase voltage threshold value and sequence voltage threshold value are set, the phase voltage of each phase, sequence voltage in bus circuit are sampled, when a two-phase Phase voltage be lower than the second phase voltage threshold value, and negative sequence voltage be higher than negative sequence voltage threshold value when, can determine that the two-phase has occurred Line to line fault or double earthfault；This method only needs to sample the phase voltage and sequence voltage of phase each in bus circuit It whether there is failure in decision circuitry, and determine fault type, method is simple, it is easy to implement, wherein the first phase voltage threshold value, Second phase voltage threshold value, third phase voltage threshold, residual voltage threshold value can be according to the reality of different power grids from negative sequence voltage threshold value Situation is set as suitable specific value for different power grids.

Or as shown in figure 9, the fault direction of bus circuit delay method of discrimination, comprising: S702, obtain high-voltage dc transmission The phase voltage and phase current of each phase in the bus circuit of electric inverter side exchange, and calculate the sequence voltage of bus circuit, sequence electric current and Three phase power；S704 judges that three-phase fault occurs, and raw when the phase voltage of three-phase circuit is below third phase voltage threshold At fault-signal；S706, after generating fault-signal, the fault component of delay acquisition sequence voltage, sequence failure of the current component and The direction of three phase power；S708, according to fault-signal, the fault component of sequence voltage, sequence failure of the current component and three phase power Walking direction failure occur bus circuit positive direction or failure occur bus circuit opposite direction.

Phase voltage threshold value and sequence voltage threshold value are set, the phase voltage of each phase, sequence voltage in bus circuit are sampled, when three-phase When phase voltage is below third phase voltage threshold, it can determine and three-phase fault has occurred；This method is only needed to each in bus circuit The phase voltage and sequence voltage of phase, which carry out sampling, whether there is failure in decision circuitry, and determine fault type, method letter It is single, it is easy to implement, wherein the first phase voltage threshold value, the second phase voltage threshold value, third phase voltage threshold, residual voltage threshold value and negative Sequence voltage threshold value can be set as suitable specific value for different power grids according to the actual conditions of different power grids.

In one embodiment of the invention, it is preferable that the judging result of fault direction exports after being delayed.

Phase voltage threshold value and sequence voltage threshold value are set, samples the phase voltage of each phase, sequence voltage in bus circuit, works as single-phase Voltage be lower than the first phase voltage threshold value, and residual voltage be higher than residual voltage threshold value when, can determine that single-phase connect mutually has occurred in this Earth fault；It, can be true when the phase voltage of two-phase is lower than the second phase voltage threshold value, and negative sequence voltage is higher than negative sequence voltage threshold value Line to line fault or double earthfault mutually has occurred in fixed this；It, can be with when the phase voltage of three-phase is below third phase voltage threshold Three-phase fault has occurred in determination；This method only needs that the phase voltage and sequence voltage of phase each in bus circuit are sampled and be can determine whether It whether there is failure in circuit, and determine fault type, method is simple, is easy to implement, wherein the first phase voltage threshold value, second Phase voltage threshold value, third phase voltage threshold, residual voltage threshold value and negative sequence voltage threshold value can according to the actual conditions of different power grids, It is set as suitable specific value for different power grids.

The judging result of fault direction exports after being delayed, during the delay process, each phase in systems stay sample circuit Phase voltage, sequence voltage, sequence electric current and three phase power, phase voltage, sequence voltage, sequence electric current and the three phase power of such as each phase become The case where change, judging result also accordingly changes at this time, further avoids protection system malfunction generation, so that electric network protection system Reliability is higher, increases the stability of operation of power networks.

As shown in Figure 10, the delay that the embodiment of second aspect of the present invention provides a kind of fault direction of bus circuit is sentenced Other system, comprising: computing module 1, breakdown judge module 2, delay sampling module 3 and fault direction judgment module 4；Computing module The phase voltage and phase current of each phase in 1 bus circuit for obtaining the exchange of D.C. high voltage transmission inverter side, and calculate bus electricity Sequence voltage, sequence electric current and the three phase power on road；Breakdown judge module 2 according to phase voltage and sequence voltage for judging in bus circuit With the presence or absence of failure, failure then generates corresponding fault-signal if it exists；The sampling module 3 that is delayed is used to generate fault-signal Afterwards, the direction of the fault component of delay acquisition sequence voltage, sequence failure of the current component and three phase power；Fault direction judgment module 4 according to the walking direction failure of fault-signal, the fault component of sequence voltage, sequence failure of the current component and three phase power for sending out Opposite direction in bus circuit occurs for raw positive direction or failure in bus circuit.

In one embodiment of the invention, as shown in figure 11, the delay judgement system of the fault direction of bus circuit, packet It includes: computing module 1, the delay of breakdown judge module 2, first sampling submodule 31 and Fisrt fault walking direction submodule 41；The One delay sampling submodule 31 is used for when fault-signal is singlephase earth fault signal or double earthfault signal, and delay obtains Take the residual voltage fault component in the fault component of sequence voltage, and the zero-sequence current in delay acquisition sequence failure of the current component Fault component；Fisrt fault walking direction submodule 41 is used to lag behind zero-sequence current fault component when residual voltage fault component When, judge that the positive direction in bus circuit occurs for failure；When residual voltage fault component is ahead of zero-sequence current fault component, Judge that the opposite direction in bus circuit occurs for failure.

When single-phase earthing occurs in bus circuit or obtained when double earthfault, after delay residual voltage fault component and Zero-sequence current fault component, when residual voltage fault component lags behind zero-sequence current fault component, i.e., zero-sequence current failure is divided The phase angle of amount is greater than the phase angle of residual voltage fault component, can determine that the positive direction in bus circuit occurs for failure at this time；When When residual voltage fault component is ahead of zero-sequence current fault component, i.e., the phase angle of residual voltage fault component is greater than zero-sequence current Phase angle, then can determine failure occur bus circuit opposite direction.

In one embodiment of the invention, it is preferable that as shown in figure 12, the delay of the fault direction of bus circuit differentiates System, comprising: computing module 1, the delay of breakdown judge module 2, second sampling submodule 32 and the second fault direction judge submodule Block 42；Second delay sampling submodule 32 is used for when fault-signal is two-phase short-circuit fault signal, delay acquisition sequence voltage Negative sequence voltage fault component in fault component, and the negative-sequence current fault component in delay acquisition sequence failure of the current component； Second fault direction judging submodule 42 is used for when negative sequence voltage fault component lags behind negative-sequence current fault component, judges event Positive direction in bus circuit occurs for barrier；When negative sequence voltage fault component is ahead of negative-sequence current fault component, failure is judged The opposite direction in bus circuit occurs.

In one embodiment of the invention, as shown in figure 13, the delay judgement system of the fault direction of bus circuit, packet It includes: computing module 1, breakdown judge module 2, third delay sampling submodule 33 and third fault direction judging submodule 43；The Three delay sampling submodules 33 are used for when fault-signal is three-phase fault signal, the direction of delay acquisition three phase power；Third Fault direction judging submodule 43 is used to when the direction of three phase power be timing, judges that the pros in bus circuit occur for failure To；When the direction of three phase power is negative, judge that the opposite direction in bus circuit occurs for failure.

In one embodiment of the invention, it is preferable that breakdown judge module 4 is specifically used for: when single-phase in bus circuit The phase voltage of circuit be lower than the first phase voltage threshold value, and residual voltage be higher than residual voltage threshold value when, judge to send out in single-phase circuit Raw ground fault；Or when appointing the phase voltage of quarter-phase circuit to be below the second phase voltage threshold value in bus circuit, and negative sequence voltage is equal When higher than negative sequence voltage threshold value, judge that double earthfault or two-phase short-circuit fault occur in quarter-phase circuit；Or work as three-phase circuit Phase voltage when being below third phase voltage threshold, judge that three-phase fault occurs.

In this embodiment, phase voltage threshold value and sequence voltage threshold value are set, phase voltage, the sequence of each phase in bus circuit are sampled Voltage can determine the phase when single phase voltage is lower than the first phase voltage threshold value, and residual voltage is higher than residual voltage threshold value Singlephase earth fault has occurred；When appoint two-phase phase voltage be lower than the second phase voltage threshold value, and sequence voltage be higher than negative sequence voltage threshold When value, it can determine that line to line fault or double earthfault mutually has occurred in this；When the phase voltage of three-phase is below third phase voltage When threshold value, it can determine and three-phase fault has occurred；This method only needs to carry out the phase voltage and sequence voltage of phase each in bus circuit Sampling can whether there is failure in decision circuitry, and determine fault type, and method is simple, is easy to implement, wherein the first phase Voltage threshold, the second phase voltage threshold value, third phase voltage threshold, residual voltage threshold value can be according to different electricity from negative sequence voltage threshold value The actual conditions of net are set as suitable specific value for different power grids.

It is specific as shown in Figure 14 and Figure 15, in the bus circuit shown in Figure 14, failure has occurred at point F1, at this time the mother The phase voltage of each phase is as shown in figure 15 in line circuit, and wherein the phase voltage of A phase is decreased obviously, the A Xiang Xiang electricity after decline It forces down in the first phase voltage threshold value, calculates the sequence voltage of A phase at this time, if residual voltage is higher than residual voltage threshold value at this time, It can judge in the bus circuit shown in Figure 14, singlephase earth fault has occurred in the A phase of route.

In this embodiment, the judging result of fault direction exports after being delayed, during the delay process, systems stay sampling The phase voltage of each phase, sequence voltage, sequence electric current and three phase power in circuit, such as phase voltage, sequence voltage, sequence electric current and the three-phase of each phase The case where power changes, and judging result also accordingly changes at this time, further avoids protection system malfunction generation, so that electric Net protection system reliability is higher, increases the stability of operation of power networks.

The embodiment of the third aspect of the present invention provides a kind of computer equipment, including memory, processor and storage On the memory and the computer program that can run on the processor；The processor executes the computer program The delay method of discrimination of the fault direction of bus circuit of the Shi Shixian as described in above-mentioned any embodiment, therefore, which sets Whole beneficial effects of the delay method of discrimination of the standby fault direction including bus circuit described in any of the above-described embodiment.

The embodiment of the fourth aspect of the present invention provides a kind of computer readable storage medium, is stored thereon with computer Program realizes the fault direction of the bus circuit as described in above-mentioned any embodiment when the computer program is executed by processor Delay method of discrimination, therefore, which includes the event of bus circuit described in any of the above-described embodiment Hinder whole beneficial effects of the delay method of discrimination in direction.

In the description of the present invention, term " multiple " then refers to two or more, unless otherwise restricted clearly, term The orientation or positional relationship of the instructions such as "upper", "lower" is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of retouching It states the present invention and simplifies description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific Orientation construction and operation, therefore be not considered as limiting the invention；Term " connection ", " installation ", " fixation " etc. should all It is interpreted broadly, for example, " connection " may be fixed connection or may be dismantle connection, or integral connection；It can be straight Connect it is connected, can also be indirectly connected through an intermediary.It for the ordinary skill in the art, can be according to specific feelings Condition understands the concrete meaning of above-mentioned term in the present invention.

In the description of the present invention, the description meaning of term " one embodiment ", " some embodiments ", " specific embodiment " etc. Refer to that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one implementation of the invention In example or example.In the present invention, schematic expression of the above terms are not necessarily referring to identical embodiment or example.And And the particular features, structures, materials, or characteristics of description can be in any one or more of the embodiments or examples with suitable Mode combines.

The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims

1. a kind of delay method of discrimination of the fault direction of bus circuit characterized by comprising

The phase voltage and phase current of each phase in the bus circuit of D.C. high voltage transmission inverter side exchange are obtained, and calculates the bus Sequence voltage, sequence electric current and the three phase power of circuit；

Judge that failure then generates if it exists with the presence or absence of failure in the bus circuit according to the phase voltage and the sequence voltage Corresponding fault-signal；

After generating the fault-signal, the fault component of sequence voltage described in delay acquisition, the sequence failure of the current component and The direction of the three phase power；

According to the fault-signal, the fault component of the sequence voltage, the sequence failure of the current component and the three phase power Walking direction described in failure occur to occur in the positive direction of the bus circuit or the failure in the anti-of the bus circuit Direction.

2. the delay method of discrimination of the fault direction of bus circuit according to claim 1, which is characterized in that the delay Obtain the fault component of the sequence voltage, the direction of the sequence failure of the current component and the three phase power and described According to the direction of the fault-signal, the fault component of the sequence voltage, the sequence failure of the current component and the three phase power Judge that the failure occurs to specifically include in the positive direction of the bus circuit or the opposite direction of the bus circuit:

When the fault-signal is singlephase earth fault signal or double earthfault signal, sequence voltage described in delay acquisition Residual voltage fault component in fault component, and the zero-sequence current failure in sequence failure of the current component described in delay acquisition point Amount；

When the residual voltage fault component lags behind the zero-sequence current fault component, judge that the failure occurs described The positive direction of bus circuit；

When the residual voltage fault component is ahead of the zero-sequence current fault component, judge that the failure occurs described The opposite direction of bus circuit.

3. the delay method of discrimination of the fault direction of bus circuit according to claim 1, which is characterized in that the delay Obtain the fault component of the sequence voltage, the direction of the sequence failure of the current component and the three phase power and described According to the direction of the fault-signal, the fault component of the sequence voltage, the sequence failure of the current component and the three phase power Judge that the failure occurs in the positive direction of the bus circuit or the opposite direction of the bus circuit, further includes:

Negative phase-sequence electricity when the fault-signal is two-phase short-circuit fault signal, in the fault component of sequence voltage described in delay acquisition Press fault component, and the negative-sequence current fault component in sequence failure of the current component described in delay acquisition；

When the negative sequence voltage fault component lags behind the negative-sequence current fault component, judge that the failure occurs described The positive direction of bus circuit；

When the negative sequence voltage fault component is ahead of the negative-sequence current fault component, judge that the failure occurs described The opposite direction of bus circuit.

4. the delay method of discrimination of the fault direction of bus circuit according to claim 1, which is characterized in that the delay Obtain the fault component of the sequence voltage, the direction of the sequence failure of the current component and the three phase power and described According to the direction of the fault-signal, the fault component of the sequence voltage, the sequence failure of the current component and the three phase power Judge that the failure occurs in the positive direction of the bus circuit or the opposite direction of the bus circuit, further includes:

When the fault-signal is three-phase fault signal, the direction of three phase power described in delay acquisition；

When the direction of the three phase power is timing, judge that the positive direction in the bus circuit occurs for the failure；

When the direction of the three phase power is negative, judge that the opposite direction in the bus circuit occurs for the failure.

5. the delay method of discrimination of the fault direction of bus circuit according to any one of claim 1 to 4, feature exist In, it is described to be judged to whether there is failure in the bus circuit according to the phase voltage and the sequence voltage, specifically:

When single-phase circuit in the bus circuit the phase voltage be lower than the first phase voltage threshold value, and residual voltage be higher than zero sequence When voltage threshold, judge that ground fault occurs in the single-phase circuit；Or

When appointing the phase voltage of quarter-phase circuit to be below the second phase voltage threshold value in the bus circuit, and negative sequence voltage is high When negative sequence voltage threshold value, judge that double earthfault or two-phase short-circuit fault occur in the quarter-phase circuit；Or

When the phase voltage of three-phase circuit is below third phase voltage threshold, judge that three-phase fault occurs.

6. the delay method of discrimination of the fault direction of bus circuit according to any one of claim 1 to 4, feature exist In the judging result of fault direction exports after being delayed.

7. a kind of delay judgement system of the fault direction of bus circuit characterized by comprising

Computing module, for obtaining the phase voltage and phase current of each phase in the bus circuit that D.C. high voltage transmission inverter side exchanges, And calculate the sequence voltage of the bus circuit, sequence electric current and three phase power；

Breakdown judge module, for being judged in the bus circuit according to the phase voltage and the sequence voltage with the presence or absence of event Barrier, failure then generates corresponding fault-signal if it exists；

Be delayed sampling module, is used for after generating the fault-signal, the fault component of sequence voltage described in delay acquisition, the sequence The direction of failure of the current component and the three phase power；

Fault direction judgment module, for according to the fault component of the fault-signal, the sequence voltage, the sequence electric current therefore Hinder failure described in the walking direction of component and the three phase power to occur to send out in the positive direction of the bus circuit or the failure The raw opposite direction in the bus circuit.

8. the delay judgement system of the fault direction of bus circuit according to claim 7, which is characterized in that the delay Sampling module further include:

First delay sampling submodule, for being singlephase earth fault signal or double earthfault signal when the fault-signal When, the residual voltage fault component in the fault component of sequence voltage described in delay acquisition, and the event of sequence electric current described in delay acquisition Hinder the zero-sequence current fault component in component；

The fault direction judgment module further include:

Fisrt fault walking direction submodule, for lagging behind the zero-sequence current failure point when the residual voltage fault component When amount, judge that the positive direction in the bus circuit occurs for the failure；

9. the delay judgement system of the fault direction of bus circuit according to claim 7, which is characterized in that the delay Sampling module further include:

Second delay sampling submodule, is used for when the fault-signal is two-phase short-circuit fault signal, sequence described in delay acquisition Negative sequence voltage fault component in the fault component of voltage, and the negative-sequence current in sequence failure of the current component described in delay acquisition Fault component；

The fault direction judgment module further include:

Second fault direction judging submodule, for lagging behind the negative-sequence current failure point when the negative sequence voltage fault component When amount, judge that the positive direction in the bus circuit occurs for the failure；

10. the delay judgement system of the fault direction of bus circuit according to claim 7, which is characterized in that described to prolong When sampling module further include:

Third delay sampling submodule, is used for when the fault-signal is three-phase fault signal, three-phase function described in delay acquisition The direction of rate；

The fault direction judgment module further include:

Third fault direction judging submodule judges that the failure occurs for being timing when the direction of the three phase power The positive direction of the bus circuit；

11. the delay judgement system of the fault direction of bus circuit according to any one of claims 7 to 10, feature It is, the breakdown judge module is specifically used for:

12. the delay judgement system of the fault direction of bus circuit according to any one of claims 7 to 10, feature It is, the judging result of fault direction exports after being delayed.

13. a kind of computer equipment, including memory, processor and it is stored on the memory and can be on the processor The computer program of operation, which is characterized in that the processor realizes such as claim 1 to 6 when executing the computer program Any one of described in bus circuit fault direction delay method of discrimination.

14. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program The delay differentiation side of the fault direction such as bus circuit described in any one of claims 1 to 6 is realized when being executed by processor Method.