CN105186467A - Distributed power fault analysis method and protection system - Google Patents
Distributed power fault analysis method and protection system Download PDFInfo
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- CN105186467A CN105186467A CN201510414761.6A CN201510414761A CN105186467A CN 105186467 A CN105186467 A CN 105186467A CN 201510414761 A CN201510414761 A CN 201510414761A CN 105186467 A CN105186467 A CN 105186467A
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Abstract
The present invention discloses a distributed power fault analysis method and a protection system. A fault protection uploads a detected fault current magnitude to a master station. The master station searches a fault feeder by a fault feeder judgment criterion, determines the power supply path where a fault is and then generates a fault judgment vector. A fault area out point is determined through the fault judgment vector, and since the fault area out point is associated with a fault area, the fault area is determined. After the fault area is determined, the master station continues to generate a fault trip vector, a trip command is sent by a relevant IED node, and the fault area is isolated successfully.
Description
Technical field
The present invention relates to a kind of technical field of distributed power source electric generation management, specifically, is a kind of distributed power source failure analysis methods and protection system.
Background technology
Along with people are to the maturation of the growing interest of environmental problem and high-effect small volume generation technology, the quantity of DG and in electric power system shared proportion will be more and more higher.And the access of distributed power source; traditional single supply radial distribution networks is made to become the multi-power system that spreads all over power supply and load; change the radial structure of distribution; change distribution trend; thus a series of impact is created on the operation of system and protection; simultaneously; along with the increase of DG permeability; existing safeguard measure exposes some shortcomings, as can not make full use of DG generating capacity, add requirement to system reserve, easily cause common mode to trip, reduce the power supply reliability etc. of power distribution network.
Summary of the invention
Based on the deficiency that prior art exists, the present invention proposes a kind of distributed power source failure analysis methods and protection system, method comprise that load excision judges, adaptive guard adjusts, fault search and connect switch protection action.
When distributed power source breaks down, distributed power source in non-faulting region possibly cannot provide enough power to load, simultaneously, also the demand that likely power of distributed power source overloads in non-faulting region, therefore, in order to prevent cutting when not cutting enough with power during underpower by mistake, need to be judged by corresponding algorithm.
When carrying out cutting load operation, need to know the detailed data of all loads in microgrid and the significance level of each load, to ensure that system is uninterrupted for the power supply of coulomb balance and important load, and cannot by installing monitoring device at each load place in reality, therefore, adopt algorithm to carry out the information of calculated load, utilize the electric current of connection circuit breaker and the distributed power source measured in real time, the load in zoning:
In formula,
represent the power that load consumes,
represent the gross power flowing to this region,
represent the power that in region, all distributed power sources provide.
According to the current value of on-line measurement, can calculate in real time
with
, thus absorbed power still outside transmitted power when can judge this region, when
during for negative value, represent that electric energy is confessed to other regions in this region.When breaking down in system, protective device can judge whether this region load exceedes the capacity of distributed power source in this region on this basis, region under island operation state, if its distributed power source capacity is greater than load, then do not need cutting load, make to keep balancing for electricity consumption in region by means of only frequency modulation device, when the load in this region is greater than distributed power source capacity, then need to carry out excision load, protective device considers the safety system in region, the situation of fault preload and the importance of load, trip command is sent to the circuit breaker connecting respective negative lotus, the size of the load of excision is:
, in formula, SF is coefficient of safety, gets 1.1.
By power distribution network is carried out subregion, thus make the load capacity approximately equal in the capacity of the distributed power source in each region and region, when can make the excision carrying out load after breaking down, only excise less fluctuating load, Region dividing completes and after determining zone boundary, can QA connection switch adjacent two interregional installations, connect switch not only can action repeatedly, remote motion signal can also be received, connecting relay switch being arranged the simultaneous operation of interlocking simultaneously, to ensure the accuracy protecting correct operation and signal, Surveillance center monitors the electric current of the specific node of the system of flowing through in real time, the protection of relevant operational and system is completed based on the electric current of monitoring, the electric current of monitoring comprises: the electric current on the electric current that all distributed power sources provide and main feeder line, the electric current that the electric current that all interregional connection switches flow through and all zone boundaries are flow through, Surveillance center is provided with memory, store the parameter of all devices in distribution network, as Substation parameters, transmission line parameter, protective device definite value and distributed electrical source dates, the prediction curve of all loads in network, the dividing condition of network area, the parameter in region, the action frequency of protective device under different faults.
The protect types connecting switch comprises: current quick, negative-sequence current fast tripping protection, inverse time current protection, negative phase-sequence inverse time current protection and under-voltage protection.
Current quick provides protection to the three phase short circuit fault that circuit occurs, and judges the size of three-phase current, the protection act when three-phase current is all greater than definite value.
Negative-sequence current fast tripping protection provides protection to the asymmetry short circuit fault that circuit occurs, and judges the size of negative-sequence current, the protection act when negative-sequence current is greater than definite value.
Inverse time current protection is the backup protection of current quick, and for the protection of the three-phase shortcircuit of circuit, adopt inverse time protection strategy, its manner of execution is:
In formula, t is operate time of protection, and K is delayed setting coefficient,
for the phase current values that protector measuring arrives,
for phase current fiducial value.
Negative phase-sequence inverse time current protection is the backup protection of negative-sequence current fast tripping protection, and for the protection of the asymmetry short circuit fault of circuit, adopt inverse time protection strategy, its manner of execution is:
In formula, t is operate time of protection, and K is delayed setting coefficient,
for the negative sequence current value that protector measuring arrives,
for negative-sequence current fiducial value, under-voltage protection, or for under-voltage protection, provide under-voltage protection to the load in microgrid, when line voltage some in three-phase voltage lower than definite value and the time exceedes setting time time, under-voltage protection action.
Further; due to the difference of fault occurrence positions; fault is also different to the distance connecting switch; thus different abort situation can through the impedance of different size to connection switch; thus different short-circuit current values can be produced; simultaneously; dissimilar fault also can produce dissimilar short circuit current; therefore; adaptive adjustment is needed to connect the protection seting value of switch with the change of the change and abort situation that adapt to fault type; first, by the data of monitoring, short-circuit current value when calculating the short circuit of protected circuit end is in real time:
In formula,
for safety factor, get 1.2-1.3,
for fault type,
for the equiva lent impedance of protective device rear end,
for the impedance of protection circuit,
for the equivalent potential of protective device rear end.
The size of short circuit current is relevant with system operation mode, short-circuit-type and short dot position on the line, when on circuit
place is short-circuited, then short circuit current is:
In formula,
for adaptive guard scope
Order
, then adaptive guard scope can be drawn
The fault type of real-time measurement electrical network
, when electrical network is three phase short circuit fault,
get 1, when electrical network is two-phase short-circuit fault,
get
.
After fault occurs, the fault current size detected is uploaded to main website by first each feeder line top IED, and fault feeder is searched for by fault feeder criterion by main website, namely finds out one that fault current is maximum, and corresponding feeder line is fault feeder.Then location, fault zone and isolation is started: fault direction information architecture supply path vector and the fault direction information vector at this place uploaded according to intelligent electronic device IED each on real-time feeder line structure figure and this feeder line, by conversion and some simple vector operations of some vectors, determined the supply path of guilty culprit before this, then breakdown judge vector is generated, determine that fault zone goes out a little by breakdown judge vector, because fault zone goes out a little to be associated with fault zone, thus determine fault zone.After determining fault zone, main website just can continue to generate fault trip vector, sends trip signal, fault zone successfully can be isolated to relevant IED node.
Further, fault search comprise set up fault search model, fault direction judge and fault zone search.
Regard every bar bus of electrical network as node, regard the circuit of connection two buses as limit, according to above swimming over to downstream serial number from big to small.
Namely
, in formula
, n is the number of grid nodes; After fault occurs, the node in failure judgement direction can initiate searching process from each simultaneously.Until the next one that these processes search on fault direction can be judged the node of fault direction and terminate.Namely
One-sidedly to have on the electrical network tip circuit of power supply if fault occurs in only have, then the node experiencing fault current can judge that fault direction is positioned at the downstream of this node.
Order
Then
Under malfunction, the search of fault zone is from all
node initiate, end at the next one that the node of initiating fault zone search is judged on fault direction
node.
Concrete search procedure is:
(1), after experiencing fault current, the division of relevant fault area is by all
node start simultaneously, namely
node start simultaneously:
(2) if node i failure judgement occurs on node j direction, must have
, fault zone search is to node j;
(3) if node j can not judge fault direction, namely
, then continue to forward fault search signal on same direction;
Namely receive the search signal coming from upstream to forward to downstream, or receive the search signal forwarded upstream coming from downstream, have simultaneously
;
(4) repeat the searching method of step 3, continue searching process in next node, until reach the condition of step 5, this searching process terminates;
(5) if node j can judge fault direction, namely
, then the fault zone searching process initiated by node i terminates;
If the search signal that node j receives comes from fault direction, then have simultaneously
; If the search signal received is not come from fault direction,
value constant;
(6) all
corresponding node is all the node in relevant fault area, needs to protective device uploading data.
The invention allows for a kind of distributed power source fault protection system, system is divided into three levels, comprising: system decision-making layer, protection coordination layer and protective reaction layer.Wherein system decision-making layer and protection coordination layer belong to main website SCARD system, and protective reaction layer belongs to each IED and circuit breaker and block switch.Assessment unit, reconfiguration unit and boundary element is comprised in system decision-making layer; Computing unit, decision package and performance element is comprised in protection coordination layer; Measuring unit, detecting unit and performance element is comprised again in protective reaction layer.
Have performance element in three layers, but their execution instruction has different priority, priority reduces successively from top to bottom, and the priority of system decision-making layer is the highest, and conversion zone is positioned at the bottom.
Protective reaction layer mainly completes collection and the acceptance of information and sends trip operation instruction.
Protection coordination layer, the calculating that it is correlated with to the data received from bottom and process, and utilize the basis whether its result breaks down as decision-making distribution network.
System decision-making layer, carries out coordinated monitoring from overall Shang Duige district subsystem, analyzes and makes optimum decision-making.
Assessment unit: the data of filtration system network, select some significant datas, the overall situation, the reliability of grid and economy and fail safe are assessed, also directly can send instruction according to the performance element control switch of result to conversion zone of assessment simultaneously.
Reconfiguration unit: according to the data when data obtained in each layer unit and fault and after fault recovery, carries out network reconfiguration to the power distribution network network configuration after changing.It makes corresponding adjustment by the data (the action situation of switch) received to distribution network structure, forms the distribution net work structure figure broken down and after fault recovery.
Boundary element: extract and operate and the man-machine communication interface of formation in order to aspect network operation personnel make data, as mouse, keyboard etc.
Measuring unit: there is CT subelement, PT subelement and PMU etc.The mainly three-phase voltage of completion system network, the collection of three-phase current and the data such as meritorious and idle also does preliminary process to data.
Detecting unit: do simply process and com-parison and analysis according to the data of measuring unit transmission, does preliminary judgement to the state of grid, if judged that fault occurs, sends actuating signal to performance element simultaneously.
Performance element: the action command accepting this layer of detecting unit or upper strata transmission, and perform dependent instruction, as tripping operation, close a floodgate and signal lamp.
Computing unit: advanced processes analysis and breakdown judge are carried out to the data that conversion zone is uploaded.Comprise data processing subelement and breakdown judge subelement, data processing subelement can do the process such as matrix or vector operation, fourier analysis and wavelet analysis by the related request of breakdown judge subelement to data; And breakdown judge subelement can do the judgement of fault zone, fault type and nature of trouble to fault.
Decision package: decision package, according to the result of the grid state judged in computing unit, performs an analysis and decision-making, draws the action logic of the optimum of power distribution network under running status at that time.
Accompanying drawing explanation
Fig. 1 is the structure of distributed power source fault protection system of the present invention.
Embodiment
A kind of distributed power source failure analysis methods and protection system, method comprises that load excision judges, adaptive guard is adjusted, fault search and connect switch protection action.
When distributed power source breaks down, distributed power source in non-faulting region possibly cannot provide enough power to load, simultaneously, also the demand that likely power of distributed power source overloads in non-faulting region, therefore, in order to prevent cutting when not cutting enough with power during underpower by mistake, need to be judged by corresponding algorithm.
When carrying out cutting load operation, need to know the detailed data of all loads in microgrid and the significance level of each load, to ensure that system is uninterrupted for the power supply of coulomb balance and important load, and cannot by installing monitoring device at each load place in reality, therefore, adopt algorithm to carry out the information of calculated load, utilize the electric current of connection circuit breaker and the distributed power source measured in real time, load in zoning
In formula,
represent the power that load consumes,
represent the gross power flowing to this region,
represent the power that in region, all distributed power sources provide; According to the current value of on-line measurement, can calculate in real time
with
, thus absorbed power still outside transmitted power when can judge this region, when
during for negative value, represent that electric energy is confessed to other regions in this region.When breaking down in system, protective device can judge whether this region load exceedes the capacity of distributed power source in this region on this basis, region under island operation state, if its distributed power source capacity is greater than load, then do not need cutting load, make to keep balancing for electricity consumption in region by means of only frequency modulation device, when the load in this region is greater than distributed power source capacity, then need to carry out excision load, protective device considers the safety system in region, the situation of fault preload and the importance of load, trip command is sent to the circuit breaker connecting respective negative lotus, the size of the load of excision is:
, in formula, SF is coefficient of safety, gets 1.1, by power distribution network is carried out subregion, thus make the load capacity approximately equal in the capacity of the distributed power source in each region and region, when can make the excision carrying out load after breaking down, only excise less fluctuating load, Region dividing completes and after determining zone boundary, can QA connection switch adjacent two interregional installations, connect switch not only can action repeatedly, remote motion signal can also be received, connecting relay switch being arranged the simultaneous operation of interlocking simultaneously, to ensure the accuracy protecting correct operation and signal, Surveillance center monitors the electric current of the specific node of the system of flowing through in real time, the protection of relevant operational and system is completed based on the electric current of monitoring, the electric current of monitoring comprises: the electric current on the electric current that all distributed power sources provide and main feeder line, the electric current that the electric current that all interregional connection switches flow through and all zone boundaries are flow through, Surveillance center is provided with memory, store the parameter of all devices in distribution network, as Substation parameters, transmission line parameter, protective device definite value and distributed electrical source dates, the prediction curve of all loads in network, the dividing condition of network area, the parameter in region, the action frequency of protective device under different faults.
The protect types connecting switch comprises: current quick, negative-sequence current fast tripping protection, inverse time current protection, negative phase-sequence inverse time current protection and under-voltage protection.
Current quick provides protection to the three phase short circuit fault that circuit occurs, and judges the size of three-phase current, the protection act when three-phase current is all greater than definite value.
Negative-sequence current fast tripping protection provides protection to the asymmetry short circuit fault that circuit occurs, and judges the size of negative-sequence current, the protection act when negative-sequence current is greater than definite value.
Inverse time current protection is the backup protection of current quick, and for the protection of the three-phase shortcircuit of circuit, adopt inverse time protection strategy, its manner of execution is:
In formula, t is operate time of protection, and K is delayed setting coefficient,
for the phase current values that protector measuring arrives,
for phase current fiducial value.
Negative phase-sequence inverse time current protection is the backup protection of negative-sequence current fast tripping protection, and for the protection of the asymmetry short circuit fault of circuit, adopt inverse time protection strategy, its manner of execution is:
In formula, t is operate time of protection, and K is delayed setting coefficient,
for the negative sequence current value that protector measuring arrives,
for negative-sequence current fiducial value; Under-voltage protection, or for under-voltage protection, provide under-voltage protection to the load in microgrid, when line voltage some in three-phase voltage lower than definite value and the time exceedes setting time time, under-voltage protection action.
Further; due to the difference of fault occurrence positions; fault is also different to the distance connecting switch; thus different abort situation can through the impedance of different size to connection switch; thus different short-circuit current values can be produced; simultaneously; dissimilar fault also can produce dissimilar short circuit current; therefore; adaptive adjustment is needed to connect the protection seting value of switch with the change of the change and abort situation that adapt to fault type; first, by the data of monitoring, short-circuit current value when calculating the short circuit of protected circuit end is in real time:
In formula,
for safety factor, get 1.2-1.3,
for fault type,
for the equiva lent impedance of protective device rear end,
for the impedance of protection circuit,
for the equivalent potential of protective device rear end.
The size of short circuit current is relevant with system operation mode, short-circuit-type and short dot position on the line, when on circuit
place is short-circuited, then short circuit current is:
In formula,
for adaptive guard scope;
Order
, then can draw adaptive guard scope:
The fault type of real-time measurement electrical network
, when electrical network is three phase short circuit fault,
get 1, when electrical network is two-phase short-circuit fault,
get
.
After fault occurs, the fault current size detected is uploaded to main website by first each feeder line top IED, and fault feeder is searched for by fault feeder criterion by main website, namely finds out one that fault current is maximum, and corresponding feeder line is fault feeder.Then location, fault zone and isolation is started: fault direction information architecture supply path vector and the fault direction information vector at this place uploaded according to intelligent electronic device IED each on real-time feeder line structure figure and this feeder line, by conversion and some simple vector operations of some vectors, determined the supply path of guilty culprit before this, then breakdown judge vector is generated, determine that fault zone goes out a little by breakdown judge vector, because fault zone goes out a little to be associated with fault zone, thus determine fault zone.After determining fault zone, main website just can continue to generate fault trip vector, sends trip signal, fault zone successfully can be isolated to relevant IED node.
Further, fault search comprise set up fault search model, fault direction judge and fault zone search.
Regard every bar bus of electrical network as node, regard the circuit of connection two buses as limit, according to above swimming over to downstream serial number from big to small.
Namely
, in formula
, n is the number of grid nodes, after namely fault occurs, the node in failure judgement direction can initiate searching process from each simultaneously.Until the next one that these processes search on fault direction can be judged the node of fault direction and terminate.Namely
One-sidedly to have on the electrical network tip circuit of power supply if fault occurs in only have, then the node experiencing fault current can judge that fault direction is positioned at the downstream of this node.
Order
Then
Under malfunction, the search of fault zone is from all
node initiate, end at the next one that the node of initiating fault zone search is judged on fault direction
node.
Concrete search procedure is:
(1), after experiencing fault current, the division of relevant fault area is by all
node start simultaneously, namely
node start simultaneously;
(2) if node i failure judgement occurs on node j direction, must have
, fault zone search is to node j;
(3) if node j can not judge fault direction, namely
, then continue to forward fault search signal on same direction,
Namely receive the search signal coming from upstream to forward to downstream, or receive the search signal forwarded upstream coming from downstream, have simultaneously
;
(4) repeat the searching method of step 3, continue searching process in next node, until reach the condition of step 5, this searching process terminates;
(5) if node j can judge fault direction, namely
, then the fault zone searching process initiated by node i terminates;
If the search signal that node j receives comes from fault direction, then have simultaneously
; If the search signal received is not come from fault direction,
value constant;
(6) all
corresponding node is all the node in relevant fault area, needs to protective device uploading data.
The invention allows for a kind of distributed power source fault protection system, system is divided into three levels, comprising: system decision-making layer, protection coordination layer and protective reaction layer.Wherein system decision-making layer and protection coordination layer belong to main website SCARD system, and protective reaction layer belongs to each IED and circuit breaker and block switch.Assessment unit, reconfiguration unit and boundary element is comprised in system decision-making layer; Computing unit, decision package and performance element is comprised in protection coordination layer; Measuring unit, detecting unit and performance element is comprised again in protective reaction layer.
Have performance element in three layers, but their execution instruction has different priority, priority reduces successively from top to bottom, and the priority of system decision-making layer is the highest, and conversion zone is positioned at the bottom.
Protective reaction layer mainly completes collection and the acceptance of information and sends trip operation instruction.
Protection coordination layer, the calculating that it is correlated with to the data received from bottom and process, and utilize the basis whether its result breaks down as decision-making distribution network.
System decision-making layer, carries out coordinated monitoring from overall Shang Duige district subsystem, analyzes and makes optimum decision-making.
Assessment unit: the data of filtration system network, select some significant datas, the overall situation, the reliability of grid and economy and fail safe are assessed, also directly can send instruction according to the performance element control switch of result to conversion zone of assessment simultaneously.
Reconfiguration unit: according to the data when data obtained in each layer unit and fault and after fault recovery, carries out network reconfiguration to the power distribution network network configuration after changing.It makes corresponding adjustment by the data (the action situation of switch) received to distribution network structure, forms the distribution net work structure figure broken down and after fault recovery.
Boundary element: extract and operate and the man-machine communication interface of formation in order to aspect network operation personnel make data, as mouse, keyboard etc.
Measuring unit: there is CT subelement, PT subelement and PMU etc.The mainly three-phase voltage of completion system network, the collection of three-phase current and the data such as meritorious and idle also does preliminary process to data.
Detecting unit: do simply process and com-parison and analysis according to the data of measuring unit transmission, does preliminary judgement to the state of grid, if judged that fault occurs, sends actuating signal to performance element simultaneously.
Performance element: the action command accepting this layer of detecting unit or upper strata transmission, and perform dependent instruction, as tripping operation, close a floodgate and signal lamp.
Computing unit: advanced processes analysis and breakdown judge are carried out to the data that conversion zone is uploaded.Comprise data processing subelement and breakdown judge subelement, data processing subelement can do the process such as matrix or vector operation, fourier analysis and wavelet analysis by the related request of breakdown judge subelement to data; And breakdown judge subelement can do the judgement of fault zone, fault type and nature of trouble to fault.
Decision package: decision package, according to the result of the grid state judged in computing unit, performs an analysis and decision-making, draws the action logic of the optimum of power distribution network under running status at that time.
The foregoing is only of the present invention and be preferably not limited to the present invention, obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (6)
1. a distributed power source failure analysis methods, is characterized in that, method comprises that load excision judges, adaptive guard adjusts, fault search and connect switch protection action.
2. distributed power source failure analysis methods as claimed in claim 1, is characterized in that, the load in zoning,
In formula,
represent the power that load consumes,
represent the gross power flowing to this region,
represent the power that in region, all distributed power sources provide.
3. distributed power source failure analysis methods as claimed in claim 2, it is characterized in that, the size of the load of excision is
, in formula, SF is coefficient of safety, gets 1.1.
4. distributed power source failure analysis methods as claimed in claim 3, it is characterized in that, the protect types connecting switch comprises: current quick, negative-sequence current fast tripping protection, inverse time current protection, negative phase-sequence inverse time current protection and under-voltage protection, current quick provides protection to the three phase short circuit fault that circuit occurs, judge the size of three-phase current, the protection act when three-phase current is all greater than definite value, negative-sequence current fast tripping protection provides protection to the asymmetry short circuit fault that circuit occurs, judge the size of negative-sequence current, the protection act when negative-sequence current is greater than definite value, inverse time current protection is the backup protection of current quick, for the protection of the three-phase shortcircuit of circuit, adopt inverse time protection strategy, its manner of execution is:
In formula, t is operate time of protection, and K is delayed setting coefficient,
for the phase current values that protector measuring arrives,
for phase current fiducial value, negative phase-sequence inverse time current protection is the backup protection of negative-sequence current fast tripping protection, and for the protection of the asymmetry short circuit fault of circuit, adopt inverse time protection strategy, its manner of execution is:
In formula, t is operate time of protection, and K is delayed setting coefficient,
for the negative sequence current value that protector measuring arrives,
for negative-sequence current fiducial value, under-voltage protection, provide under-voltage protection to the load in microgrid, when line voltage some in three-phase voltage lower than definite value and the time exceedes setting time time, under-voltage protection action;
By the data of monitoring, short-circuit current value when calculating the short circuit of protected circuit end is in real time:
In formula,
for safety factor, get 1.2-1.3,
for fault type,
for the equiva lent impedance of protective device rear end,
for the impedance of protection circuit,
for the equivalent potential of protective device rear end,
When on circuit
place is short-circuited, then short circuit current is:
In formula,
for adaptive guard scope;
Order
, then can draw adaptive guard scope:
The fault type of real-time measurement electrical network
, when electrical network is three phase short circuit fault,
get 1, when electrical network is two-phase short-circuit fault,
get
.
5. distributed power source failure analysis methods as claimed in claim 4, it is characterized in that, fault search comprises sets up fault search model, fault direction judgement and fault zone search, regard every bar bus of electrical network as node, regard the circuit of connection two buses as limit, according to above swimming over to downstream serial number from big to small
Namely
, in formula
, n is the number of grid nodes
After fault occurs, the node in failure judgement direction can initiate searching process from each, until the next one that these processes search on fault direction can be judged the node of fault direction and terminate, namely simultaneously
One-sidedly to have on the electrical network tip circuit of power supply if fault occurs in only have, then the node experiencing fault current can judge that fault direction is positioned at the downstream of this node,
Order
Then
Under malfunction, the search of fault zone is from all
node initiate, end at the next one that the node of initiating fault zone search is judged on fault direction
node,
Concrete search procedure is:
(1), after experiencing fault current, the division of relevant fault area is by all
node start simultaneously, namely
node start simultaneously;
(2) if node i failure judgement occurs on node j direction, must have
, fault zone search is to node j;
(3) if node j can not judge fault direction, namely
, then continue to forward fault search signal on same direction,
Namely receive the search signal coming from upstream to forward to downstream, or receive the search signal forwarded upstream coming from downstream, have simultaneously
;
(4) repeat the searching method of step 3, continue searching process in next node, until reach the condition of step 5, this searching process terminates;
(5) if node j can judge fault direction, namely
, then the fault zone searching process initiated by node i terminates;
If the search signal that node j receives comes from fault direction, then have simultaneously
; If the search signal received is not come from fault direction,
value constant;
(6) all
corresponding node is all the node in relevant fault area, to protective device uploading data.
6. the protection system of the distributed power source failure analysis methods of an application as described in claim 1-5, it is characterized in that, described system comprises: system decision-making layer, protection coordination layer and protective reaction layer, comprise assessment unit, reconfiguration unit and boundary element in system decision-making layer, computing unit, decision package and performance element is comprised in protection coordination layer, measuring unit is comprised in protective reaction layer, detecting unit and performance element, protective reaction layer mainly completes collection and the acceptance of information and sends trip operation instruction, protection coordination layer carries out the calculating of being correlated with and process from the data that bottom receives, and utilize the basis whether its result breaks down as decision-making distribution network, system decision-making floor carries out coordinated monitoring from overall Shang Duige district subsystem, analyze and make optimum decision-making, the data of assessment unit filtration system network, the overall situation, the reliability of grid and economy and fail safe are assessed, also directly can send instruction according to the performance element control switch of result to conversion zone of assessment simultaneously, reconfiguration unit is according to the data when data obtained in each layer unit and fault and after fault recovery, network reconfiguration is carried out to the power distribution network network configuration after changing, the man-machine communication interface that boundary element is formed is used as data and extracts and operation, measuring unit has CT subelement, PT subelement and PMU, the three-phase voltage of completion system network, the collection of three-phase current and meritorious and idle data also does preliminary process to data, the data processing that detecting unit transmits according to measuring unit com-parison and analysis, preliminary judgement is done to the state of grid, if judged that fault occurs, send actuating signal to performance element simultaneously, performance element accepts the action command of this layer of detecting unit or upper strata transmission, and perform dependent instruction, computing unit carries out Treatment Analysis and breakdown judge to the data that conversion zone is uploaded, comprise data processing subelement and breakdown judge subelement, data processing subelement according to the requirement of breakdown judge subelement to data processing, breakdown judge subelement does the judgement of fault zone, fault type and nature of trouble to fault, decision package: decision package is according to the result of the grid state judged in computing unit, perform an analysis and decision-making, draw the action logic of the optimum of power distribution network under running status at that time.
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| CN112766639B (en) * | 2020-12-28 | 2023-03-28 | 上海电力大学 | Distribution network multi-fault first-aid repair task rapid distribution method |
| CN113834997A (en) * | 2021-08-24 | 2021-12-24 | 国网河南省电力公司漯河供电公司 | Method for positioning fault area of power distribution network containing photovoltaic power supply based on wide area protection system |
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