CN102761108B - Logic operation-based distributed feeder automatization fault judgment method - Google Patents
Logic operation-based distributed feeder automatization fault judgment method Download PDFInfo
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Abstract
The invention relates to a logic operation-based distributed feeder automatization fault judgment method. The method is characterized in that in combination with the features of a power distribution network, an open-loop operating mode and a closed-loop operating mode of the network adopt a unified fault judgment rule, so as to avoid parameter adjustment due to the changing of operating modes. Through a fixed wire connection manner, the direction of the flow passing through a switch is set, and the flow and fault current passing through the switch are converted into unified analog quantity, and the control state of the switch can be obtained according to the logic operation of adjacent switch groups. A voltage-loss reclosing function on one side of the switch is added, so as to effectively avoid the influence on a grid, which is caused by transient fault. The method is concise, convenient and strong in adaptability, and can meet the actual requirement of feeder automatization.
Description
Technical field
The present invention relates to distribution feeder automation field, is a kind of distributed feeder automation fault verification method of logic-based computing specifically.
Background technology
Feed line automatization system, as the important component part of distribution automation, has isolated fault region and makes to perfect region quickly resume power supply function.To the area that reduces to have a power failure, shorten interruption duration, to improve power supply reliability significant.Distributed feed line automatization system is a kind of method that cooperatively interact isolated fault and recovery that relies on equipment room perfects block supply.According to the mode of Fault Isolation, can be divided into the feeder automation of switch fitting-type and " face protection " type feeder automation.The feeder automation of switch fitting-type, without communication, only relies on cooperatively interacting between automation switch isolated fault also to recover to perfect block supply.The type feed line automatization system is because the setting time between need dependence automation switch is poor and multiple shot reclosing carrys out isolated fault, and the Fault Isolation time is long, and system shock is large, and service life of equipment is low." face protection " type feeder automation is a kind of intercoming mutually and passing through the method that the judgement isolated fault of certain logic and recovery perfect block supply between automation switch that rely on; although Fault Isolation speed is fast; little to system shock, but when changing, need to again adjust power system operating mode device parameter.
Summary of the invention
For the problems referred to above, the present invention is based on switch grouping model, rely on fault current and active power direction, a kind of unified fault verification criterion that does not rely on power system operating mode has been proposed, and decision criteria is converted into a series of logical operation, propose the computational methods of a kind of switching logic value and switches set logical value, and used switches set logical value to calculate the action logic value of each switch.
As follows for realizing the technical scheme of above-mentioned purpose: first, switch is pressed to minimum distribution group areas, each switch has two adjacent minimum distribution regions at the most, the adjacent switch in each minimum distribution region is put into respectively to the 1st adjacent switch group and the 2nd adjacent switch group of this switch.
The closed set being comprised of switch and feeder line section is called to distribution region.If all end points in a region are all switches and there is no interior point or all interior points are all T contacts, claim that this region is minimum distribution region.Stipulate that between the switch in each minimum distribution region be adjacent, each switch in minimum distribution region is the adjacent switch of other switches.Adjacent switch in same distribution region is one group.Regulation has the minimum distribution region of same endpoints adjacent, and each switch has two adjacent minimum distribution regions at the most, so each switch has two adjacent switch groups at the most.
Secondly, switch in each adjacent switch group intercoms mutually by feeder-terminal-unit, each feeder-terminal-unit has A, B two ends, to the 1st adjacent switch group of inductive switch and the 2nd adjacent switch group, each switch adopts misphase mode to gather Uab, Ubc, and what definition switch was installed AB phase PT is A end, and what BC phase PT was installed is B end, and meritorious trend flows to B end for just from A end, otherwise for bearing; The judgment criterion in feeder fault interval is: if the meritorious trend in-degree in minimum distribution region is not 0, and out-degree is 0, and the electric current of flowing through is greater than a certain setting value, and fault occurs in this minimum distribution region, and concrete methods of realizing is:
Each switch analog quantity is converted to logical value, by logical operation, determines the running-active status of switch,
The action logic value of definition switch is that 0 expression switch is failure to actuate, and action logic value is 1 expression switch motion separating brake, and action logic value determines jointly by its two adjacent switches set, and concrete formula is:
（1）
Wherein, || be logic OR operator,
a xfor the action logic value of switch x,
vgroup x1,
vgroup x2for the 1st, the 2nd adjacent switch group logical value of switch x,
The switching logic value that adjacent switch group logical value is comprised by it determines jointly, and concrete formula is:
（2）
Wherein, & & is logic and operation symbol,
vN x
j (
j=1,2 ... n) be switch x
ithe logical value that individual adjacent switch group comprises switch,
vN xfor the logical value of switch x,
When switch experience fault current, its switching logic value is by the Fault load flow orientation determination that flows through switch, same switch, and its switching logic value is contrary with in the 2nd adjacent switch group in the 1st adjacent switch group, and specifically formula is:
（3）
Wherein P is the active power that flows through switch, and I is the current value that flows through switch, I
cfor the current setting of switch,
When switch does not experience fault current, its switching logic value is definite by its adjacent switch fault current logical value, and concrete formula is:
（4）
（5）
Wherein
iN xfor the fault current logical value of switch x,
iN x
j (
j=1,2 ... n) be the adjacent switch fault current logical value of switch x,
Frontier node current flowing value is 0, and its processing mode flows through identical with switch no current.
Finally, if system is temporary fault, after Fault Isolation, switch one side decompression reclosing; For guaranteeing the success of switch reclosures function, transformer station's outlet breaker configuration delaying current speed protection function, if switch detects fault current after overlapping again, switch will be latched in gate-dividing state.
If system is temporary fault, after Fault Isolation, temporary fault is eliminated, and for guaranteeing normal region power supply, needs to increase switch one side decompression reclosing function.For guaranteeing the success of switch reclosures function, transformer station's outlet breaker should configure delaying current speed protection function.
If switch detects fault current after overlapping again, illustrate that fault is permanent fault, switch will be latched in gate-dividing state.
Advantage of the present invention is: the present invention applies unified fault verification criterion by distribution open loop operational mode and operation with closed ring mode, has avoided the parameter tuning after operational mode changes; By link mode specified flow, cross the direction of tide of switch, the trend, the fault current that flow through switch are converted to unified analog quantity, the logical operation of dependence adjacent switch group obtains the state of a control of switch; Increase switch one side decompression coincidence function, effectively avoided the impact of temporary fault on electrical network.The present invention, in conjunction with power distribution network feature, has provided a kind of distributed feeder automation fault verification method of logic-based computing, and the method, by switch fault analog quantity is converted to a series of amount of logic, obtains the executing state of switch by logical operation.And then isolated fault, recover to perfect block supply.This algorithm divided ring operation and operation with closed ring power distribution network have versatility, and for feeder line temporary fault, have provided a kind of temporary fault processing method, have effectively avoided the impact of temporary fault on electrical network.
Accompanying drawing explanation
Fig. 1 is an open loop power distribution network;
Fig. 2 is a closed loop distribution power flow figure;
Fig. 3 is the schematic diagram after the BD region temporary fault of power distribution network shown in Fig. 1 is isolated;
Fig. 4 is the schematic diagram after B mono-side decompression reclosing;
Fig. 5 is the schematic diagram after D mono-side decompression reclosing.
Embodiment
Utilize method proposed by the invention to carry out the detailed process of distributed feeder automation fault verification as follows:
embodiment mono-
Power distribution network as shown in Figure 1, when system open loop moves, if when break down in switch BD interval, switch S 1, A, B experience fault current, and switch C, D do not experience fault current.According to formula (1)～(5), have:
Switch S 1 flows through fault current, and active power direction is for to flow to region S1A from switch, therefore
vN s1=1, its adjacent switch A experiences fault current, and active power direction is for flowing out region S1A event
vN s11=0, by formula (2)
vgroup s11=1 & & 0}=0, so
a s1=0, switch S 1 is failure to actuate.
switch A flows through fault current, and active power direction is from region S1A outflow, inflow region ABC.Therefore for its first adjacent set, the logical value of switch A
vN abe 0, the logical value of switch S 1
vN a1be 1, its first adjacent switches set
vgroup a1value be 0; For its second adjacent switches set, the logical value of switch A
vN abe 1, the active power direction of switch B is for flowing out region ABC, so its logical value
vN a1be 0, switch C does not experience fault current, and its switching logic value determines jointly by switch ABC, and according to formula (5), the fault current logical value of switch A, B is all 1, and the fault current logical value of switch C is 0, by the logical value of formula (4) switch C, is 1.So second switch group logical value
vgroup a2be 0.In sum, by the action logic of the known switch A of formula (1), be 0, switch A is failure to actuate.
Switch B flows through fault current, and active power direction is from region ABC outflow, inflow region BD.Therefore for its first adjacent set, the logical value of switch B is 0, the logical value of switch A
vN abe 1, switch C does not experience fault current, and its switching logic value determines jointly by switch ABC, and by formula (4), (5), the logical value of switch C is 1, therefore its first adjacent switches set logical value
vgroup b1be 0; For the second adjacent switches set, the logical value of switch B is 1, and switch D does not experience fault current, and its switching logic value is determined jointly by BD.According to the fault current logical value of formula (5) switch B, be 1, the fault current logical value of switch D is 0, by the switching logic value of formula (4) switch D
vN bbe 1, therefore the adjacent switches set logical value of switch B second
vgroup b2be 1, in sum, by formula (1), the action logic value of known switch B is 1, and switch B moves separating brake.
Switch C does not experience fault current, and for the first adjacent switches set ABC, the logical value of switch A is 1, and the logical value of switch B is 0, and the logical value of switch C is 1, its first adjacent switches set logical value
vgroup c1be 0; For the second adjacent switches set, its adjacent switch is frontier node, does not experience fault current, and its switching logic value determines jointly by adjacent switch C, and by formula (4) (5), the fault current logical value of switch C and frontier node is 0, and switching logic value is all 0.Therefore its second adjacent switches set logical value
vgroup c2be 0, by formula (1), the action logic value of known switch C is 0, and switch C is failure to actuate.
Switch D does not experience fault current, and for the first adjacent switches set, the logical value of switch B is 1, and the logical value of switch D is 1, its first adjacent switches set logical value
vgroup d1be 1; For the second adjacent switches set, switch E is interconnection switch, does not experience fault current, and according to formula (4) (5), the fault current logical value of switch DE is 0, and switching logic value is all 0, therefore its second adjacent switches set logical value
vgroup d2be 0, by formula (1), the action logic value of known switch D is 1, and switch D moves separating brake.
Other switches, owing to not experiencing fault current, are all 0 according to its fault current logical value of formula (4) (5), and switching logic value is all 0, therefore adjacent switch class value is also all 0, obviously, switch motion logical value is also all 0, and switch is failure to actuate.
So far, whole Fault Isolation is disposed, switch B, D separating brake, and fault is isolated in this interval, and interconnection switch E delay time, to rear startup closing function, recovers perfecting the power supply of section DE.
embodiment bis-
When system operation with closed ring, for power distribution network shown in Fig. 1, if break down in switch BD interval, switch S 1, A, B, D, E, F, G, H, S2 all experience fault current, and switch C does not experience fault current.The meritorious trend of its fault flows to as shown in Figure 2:
Identical when the analysis of switch S 1, A, C moves with open loop, repeat no more.
Switch B experiences fault current, and to its first adjacent switches set ABC, the logical value of switch A is 1, and the logical value of switch B is 0, and the logical value of switch C is the logical value of 1, the first adjacent set
vgroup b1be 0; For the second adjacent switches set BD, the logical value of switch B
vN bbe 1, switch D flows through fault current, and active power direction is for flowing into interval B D, therefore its switching logic value
vN b1be 1, therefore its second adjacent switches set logical value
vgroup b2be 1, by formula (1), the action logic value of known switch B is 1, and switch B moves separating brake.
Switch D experiences fault current, and to its first adjacent switches set BD, the logical value of switch B is 1, and the logical value of switch D is 1, the logical value of its first adjacent set
vgroup d1be 1; For the second adjacent switches set DE, because the active power direction of switch D is for flowing out interval DE, therefore its switching logic value is 0, switch E flows through fault current, and active power direction is for flowing into interval DE, therefore its switching logic value is 1, therefore the second adjacent switches set logical value
vgroup d2be 0, by formula (1), the action logic value of known switch D is 1, and switch D moves separating brake.
The analysis of the analysis of switch E, F, G, H, S2 switch S 1, A during to open loop is similar, and switch neither moves, and repeats no more.
embodiment tri-
If system is temporary fault, after Fault Isolation, temporary fault is eliminated, and for guaranteeing normal region power supply, needs to increase switch one side decompression reclosing function.For guaranteeing the success of switch reclosures function, transformer station's outlet breaker should configure delaying current speed protection function.
If switch detects fault current after overlapping again, illustrate that fault is permanent fault, switch will be latched in gate-dividing state.
For power distribution network shown in Fig. 1, when temporary fault occurs in BD region, switch BD is separating brake, isolated fault, as shown in Figure 3.After switch BD separating brake, if Failure elimination, now switch B detects one side decompression, starts a side decompression reclosing function, as shown in Figure 4.After switch B closes a floodgate, region BD normal power supply, now switch D detects one side decompression, starts a side decompression reclosing function, as shown in Figure 5, whole restoration so far.
Claims (1)
1. a distributed feeder automation fault verification method for logic-based computing, is characterized in that adopting following steps:
First, by switch, by minimum distribution group areas, each switch has two adjacent minimum distribution regions at the most, the adjacent switch in each minimum distribution region is put into respectively to the 1st adjacent switch group and the 2nd adjacent switch group of this switch;
Secondly, switch in each adjacent switch group intercoms mutually by feeder-terminal-unit, each feeder-terminal-unit has A, B two ends, and to the 1st adjacent switch group of inductive switch and the 2nd adjacent switch group, each switch adopts misphase mode to gather Uab, Ubc, Uab is AB phase line voltage, Ubc is BC phase line voltage, and what definition switch was installed AB phase PT is A end, and what BC phase PT was installed is B end, and meritorious trend flows to B end for just from A end, otherwise for bearing; The judgment criterion in feeder fault interval is: if the meritorious trend in-degree in minimum distribution region is not 0, and out-degree is 0, and the electric current of flowing through is greater than a certain setting value, and fault occurs in this minimum distribution region, and concrete methods of realizing is:
Each switch analog quantity is converted to logical value, by logical operation, determines the running-active status of switch,
The action logic value of definition switch is that 0 expression switch is failure to actuate, and action logic value is 1 expression switch motion separating brake, and action logic value determines jointly by its two adjacent switches set, and concrete formula is:
A
x＝{Vgroup
x1||Vgroup
x2} (1)
Wherein, || be logic OR operator, A
xfor the action logic value of switch x, Vgroup
x1, Vgroup
x2for the 1st, the 2nd adjacent switch group logical value of switch x,
The switching logic value that adjacent switch group logical value is comprised by it determines jointly, and concrete formula is:
Vgroup
xi＝(VN
x&&VN
x1&&VN
x2&&…&&VN
xn) (2)
Wherein, & & is logic and operation symbol, VN
xjfor the logical value that i adjacent switch group of switch x comprises switch, j=1,2 ... n, VN
xfor the logical value of switch x,
When switch experience fault current, its switching logic value is by the Fault load flow orientation determination that flows through switch, same switch, and its switching logic value is contrary with in the 2nd adjacent switch group in the 1st adjacent switch group, and specifically formula is:
Wherein P is the active power that flows through switch, and I is the current value that flows through switch, I
cfor the current setting of switch, when switch does not experience fault current, its switching logic value is definite by its adjacent switch fault current logical value, and concrete formula is:
VN
x＝(IN
x||IN
x1||IN
x2…||IN
xn) (4)
IN wherein
xfor the fault current logical value of switch x, IN
xjfor the adjacent switch fault current logical value of switch x, j=1,2 ... n,
Frontier node current flowing value is 0, and it is identical that its processing mode and switch no current flow through,
Finally, if system is temporary fault, after Fault Isolation, switch one side decompression reclosing; For guaranteeing the success of switch reclosures function, transformer station's outlet breaker configuration delaying current speed protection function, if switch detects fault current after overlapping again, switch will be latched in gate-dividing state.
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| CN105548801B (en) * | 2015-12-02 | 2018-12-07 | 南京四方亿能电力自动化有限公司 | Fault Locating Method suitable for power distribution network operation with closed ring |
| CN106100117A (en) * | 2016-06-15 | 2016-11-09 | 国家电网公司 | Distributed feeder-terminal-unit collocation method based on minimum distribution region |
| CN106646124B (en) * | 2016-12-09 | 2019-03-26 | 国网江苏省电力公司淮安供电公司 | A kind of feeder fault self-adapting diagnostic method of Thief zone distributed generation resource |
| CN109001595A (en) * | 2018-08-13 | 2018-12-14 | 陕西银河天地智能配网技术有限公司 | Feeder automation testing scheme may be programmed automatic generation method |
| CN109995003B (en) * | 2019-04-22 | 2021-03-16 | 北京天能继保电力科技有限公司 | Intelligent distributed feeder automation method based on state quantity |
| CN112505463B (en) * | 2020-12-07 | 2022-08-16 | 广西电网有限责任公司电力科学研究院 | Logic testing device capable of automatically identifying terminal roles |
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