CN103560494B - The short circuit current acquisition methods that distribution protection is adjusted - Google Patents
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Abstract
The invention discloses the short circuit current acquisition methods that a kind of distribution protection is adjusted, it includes step 1, sets up power distribution network three-phase network Equivalent Model by calculating three-phase line parameter and transformer T-shaped equivalent transformation；Step 2, asks for the rated load current of power distribution network according to three-phase network Equivalent Model；Step 3, utilizes trouble point in three-phase network Equivalent Model to the mode of root node equiva lent impedance to ask for the fault current of power distribution network；Step 4, by asking for each branch, short-circuit current value by the method for the rated load current of each branch road and fault current addition of vectors.It has the advantage that computational methods are simple, practical, it is fast to calculate speed, and result of calculation is reliable, the most applicable for open loop and weakly loops network, it is not necessary to specially treated, it is to avoid triphase parameter is uneven and three-phase load asymmetry problem.
Description
Technical field
The present invention relates to the short circuit current acquisition methods that a kind of distribution protection is adjusted.
Background technology
The accurately configuration of power distribution network relay protection to power distribution network protective relaying device efficiently, quickly and accurately to faulty section
Domain separation serves vital effect.And the configuration of short circuit current threshold value is an important composition portion of relay protection scheme
Point.Power distribution network has the following characteristics that network topology is general radially, and R/X ratio is relatively big, and circuitry number and nodes are more, three
Imbalance etc. mutually.The adjust acquisition methods of short circuit current of distribution protection is varied, but high pressure asks for method for R/X ratio
Bigger distribution network line, its short circuit current is difficult to calculate accurately；Symmetrical component method needs the triphase parameter of three-phase system to balance,
And the load of power distribution network and line parameter circuit value are generally in unbalanced state；Based on Fault Compensation method and the actual phase sequence side of expression
Method, decoupling component method etc., although the short circuit current that these methods can be suitable for power distribution network obtains, but method is more complicated, calculate effect
Rate is relatively low.
Summary of the invention
The invention provides the short circuit current acquisition methods that a kind of distribution protection is adjusted, which overcome in background technology not
Be applicable to circuit, R/X ratio is relatively big, the protection seting short circuit current of triphase parameter unbalanced system is asked for, and calculates complicated, effect
The shortcoming that rate is relatively low.
The present invention solves being the technical scheme is that of its technical problem
The short circuit current acquisition methods that distribution protection is adjusted, it includes step 1, obtains three-phase line parameter and transformer
T-shaped equivalent transformation, and set up power distribution network three-phase network Equivalent Model according to this；Step 2, asks for joining according to three-phase network Equivalent Model
The rated load current of electrical network；Step 3, utilizes trouble point in three-phase network Equivalent Model to the mode of root node equiva lent impedance to ask
Take the fault current of power distribution network；Step 4, by asking the method for the rated load current of each branch road and fault current addition of vectors
Take each branch, short-circuit current value.
In described step 2, the rated load current step utilizing three-phase network Equivalent Model to ask for each phase of power distribution network includes:
Step 21, from the beginning of root node, carries out node serial number according to BFS method to network node, simultaneously from upper
Down branch road is layered；
Step 22, arranges root node three-phase voltage initial value；
Step 23, according to distribution network line and transformer equivalent model calculate three phase of impedance under each branch road rated condition and
Transformer reduction is on high-tension side equiva lent impedance and admittance；
Step 24, pushes back the rated load current asking for each branch road for method before utilizing distribution trend.
Among one embodiment, by step 1 obtain following parameter: r be the unit resistance of circuit, x be the unit electricity of circuit
Anti-, l is leg length, RgFor ground resistance, XSMFor two-phase mutual impedance；
The impedance matrix Z of any one branch road of described three-phase lineLIt is expressed as:
This ZAA、ZBB、ZCCFor self-impedance, this circuit self-impedance is: ZSS=rl+jxl；
This ZAB、ZBC、ZCAFor mutual impedance, this circuit mutual impedance is: ZSM=Rg+jXSM, Rg=π2×10-4 f,
Wherein, f takes 50Hz, DgFor the current equivalence degree of depth in circuit；DSMBetween circuit two-phase
Distance.
Among one embodiment: also obtained following parameter by step 1: Δ PkRated load for transformer is lost；UNFor becoming
The rated voltage of depressor；SNRated capacity for transformer；Uk% is the percentage of transformer impedance drop；ΔP0For transformer
Rated no-load loss；I0% is the percentage of transformer rated no-load current；
Described transformer each phase parameter after T-shaped equivalent transformation is represented by:
Wherein: RT
All-in resistance for transformer high-low-voltage winding；XTTotal impedance for transformer high-low-voltage winding；GTConductance for transformer；BTFor
The susceptance of transformer.
Among one embodiment: in described step 3, trouble point to the side of root node equiva lent impedance in three-phase network Equivalent Model
Formula is asked for the step of distribution network failure electric current and is included:
Step 31, calculates each branch road under the fault condition that is short-circuited according to distribution network line and transformer equivalent model
Three phase of impedance；
Step 32, calculates fault point and is short-circuited the three-phase voltage after fault calculate trouble point to each branch road of root node
Fault current.
Among one embodiment: described each branch, short-circuit electric current is each branch road rated load current and vectorial the folding of fault current
Add.
The technical program is compared with background technology, and it has the advantage that
1, by first obtaining three-phase line parameter and transformer T-shaped equivalent transformation, and power distribution network three-phase net is set up according to this
Network Equivalent Model；Then the rated load current of power distribution network is asked for according to three-phase network Equivalent Model；Recycling three-phase network etc.
In value model, trouble point to the mode of root node equiva lent impedance asks for the fault current of power distribution network；Finally, by by each branch road
The method of rated load current and fault current addition of vectors is asked for the distribution protection of each branch, short-circuit current value and is adjusted short circuit
Electric current acquisition methods, goes for the distribution network systems that line parameter circuit value is asymmetric, circuit R/X ratio is bigger, is simultaneously suitable for out
The distribution network protection of ring and weak looped distribution network network is adjusted the acquisition of short circuit current, and it is few that the method asks for step, and method is simple, applicability
Extensively.
2, described each branch, short-circuit electric current is each branch road rated load current and the superposition of fault current vector, i.e. short circuit event
Rated load current before barrier and the fault current after fault independently process, it is possible to adapt to engineering calculation needs, it is adaptable to
The short circuit current of large-scale distribution network relay protection obtains.
Accompanying drawing explanation
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Fig. 1 depict distribution protection adjust short circuit current obtain flow chart.
Fig. 2 depicts the feed connection node annexation after layered numbering and hierarchical relational figure.
Fig. 3 depicts power distribution network rated load current and obtains flow chart.
Fig. 4 depicts the PSB tool box of MATLAB and builds the simulation model figure of this feeder line.
Fig. 5 depicts the error curve diagram asking for value and standard value of each branch road three short circuit current.
Fig. 6 depicts each branch road AB line to line fault, and A phase short circuit current asks for the error curve of value and standard value.
Detailed description of the invention
Refer to Fig. 1 to Fig. 6, the short circuit current acquisition methods that distribution protection is adjusted, it includes step 1, obtains three-phase
Line parameter circuit value and transformer T-shaped equivalent transformation, and set up power distribution network three-phase network Equivalent Model according to this；Step 2, according to three-phase net
Network Equivalent Model asks for the rated load current of power distribution network；Step 3, utilizes in three-phase network Equivalent Model trouble point to root node
The mode of equiva lent impedance asks for the fault current of power distribution network；Step 4, by by the rated load current of each branch road and fault current
The method of addition of vectors asks for each branch, short-circuit current value.
(1) as described in step 1 set up power distribution network three-phase network Equivalent Model, first having to obtain following parameter: r is line
The unit resistance on road, x be the unit reactance of circuit, l be leg length, RgFor ground resistance, XSMFor two-phase mutual impedance；
The impedance matrix Z of any one branch road of described three-phase lineLIt is expressed as:
This ZAA、ZBB、ZCCFor self-impedance, this circuit self-impedance is: ZSS=rl+jxl；
ShouldZ AB、ZBC、ZCAFor mutual impedance, this circuit mutual impedance is: ZSM=Rg+jXSM, Rg=π2×10-4 f,
Wherein, f takes 50Hz, DgFor the current equivalence degree of depth in circuit；DSMBetween circuit two-phase
Distance.
Furthermore, following parameter will be obtained: Δ PkRated load for transformer is lost；UNRated voltage for transformer；SN
Rated capacity for transformer；Uk% is the percentage of transformer impedance drop；ΔP0Rated no-load for transformer is lost；
I0% is the percentage of transformer rated no-load current；
Transformer in power distribution network each phase parameter after T-shaped equivalent transformation is represented by:
Wherein: RT
All-in resistance for transformer high-low-voltage winding；XTTotal impedance for transformer high-low-voltage winding；GTConductance for transformer；BTFor
The susceptance of transformer.
(2) as described in step 2, three-phase network Equivalent Model is utilized to ask for the rated load current step bag of each phase of power distribution network
Include:
Step 21, from the beginning of root node, carries out node serial number according to BFS method to network node, simultaneously from upper
Down branch road is layered；
Step 22, makes root node three-phase voltage initial value be respectively as follows: Wherein U is the measurement virtual value of root node line voltage.
Step 23, according to distribution network line and transformer equivalent model calculate three phase of impedance under each branch road rated condition and
Transformer reduction is on high-tension side equiva lent impedance and admittance, and concrete each parameter is calculated as follows；
1) transformer resistance loss (kW) is:Wherein: φ represents each phase of three-phase, Uφ
For the magnitude of voltage of transformer T-shaped equivalent circuit load side, its initial value is identical with root node voltage, PφFor transformer T-shaped equivalent electric
The active power of road load side, QφReactive power for transformer；
2) transformer reactance loss (kvar) is:
3) the vertical component of transformer voltage landing is:
The voltage horizontal component of landing is:
The voltage magnitude of transformer T-shaped equivalent circuit power end is:
Phase place between transformer T-shaped equivalent circuit power end and load side voltage is:
4) transformer conductance loss (kW) is: Δ PyTφ=GT(U′φ)2×10-3；
5) transformer susceptance loss (kW) is: Δ QyTφ=BT(U′φ)2×10-3；
6) injecting power that transformer is totalFor:
7) electric current of calculating transformer T-shaped equivalent circuit power end, in an embodiment, distribution transformer is Dyn connection, by
Each phase power end voltage magnitude U 'φWith voltage phase angle δTφThe line voltage (kV) obtaining high-pressure side D end is:
According to the conservation of energy, by transformer each phase injecting power S 'φ, the line injecting power (kV A) of high-pressure side D end can be obtained
For:
Then the winding current of high voltage side of transformer D end is:
The load phase current of high voltage side of transformer D end is:
Step 24, pushes back the rated load current asking for each branch road for method, concrete steps bag before utilizing distribution trend
Include；
1) front journey is pushed through
If tail node j of this branch road (j) is the end-node of circuit, then flow through the electric current load equal to this node of this branch road
Electric current, it may be assumed that
If tail node j of branch road (j) is not the end-node of circuit, then according to Kirchhoff's current law (KCL), branch road electricity
StreamShould be this branch road load currentWith along its all electric current sums being followed by sub-branch road of direction of tide, it may be assumed that
In formula, h is all set being followed by sub-branch road of node j.
2) backward steps
According to Kirchhoff's second law, the voltage relationship of the head and the tail node of branch road (j) is:
Wherein:For branch road (j)
The voltage of first node.
3) convergence decision condition
The voltage that adjacent twice iterative computation goes out before and after node each on circuit subtracts each other difference by the time less than given
Restrain during error ε, it may be assumed that
In formula: k is iterations.
When iteration convergence, then each branch road load current of kth time iteration gainedIt is the rated load electricity of each branch road
Stream.
(3), in described step 3, in three-phase network Equivalent Model, distribution is asked for the mode of root node equiva lent impedance in trouble point
The step of net fault current includes:
Step 31, calculates each branch road under the fault condition that is short-circuited according to distribution network line and transformer equivalent model
Three phase of impedance:
Wherein: L is trouble point to all branch roads of root node
Set, Zaa, Zbb, ZccFor the self-impedance sum of branch roads all from trouble point to root node, Zab, Zcb, Zac, Zbc, Zba, ZcaFor from
Trouble point is to the mutual impedance sum of all branch roads of root node；
Step 32, calculates fault point and is short-circuited the three-phase voltage after fault calculate trouble point to each branch road of root node
Fault current:
Wherein:WithEvent is being there is for fault point
Three-phase voltage before barrier,Three-phase fault current vector for all branch roads in trouble point to root node.
(4) by obtaining each branch road rated load current and short-circuit current, it is thus achieved that each branch, short-circuit electric current, described
Each branch, short-circuit electric current is each branch road rated load current and the superposition of fault current vector, and i.e. trouble point is to all of root node
The short circuit current on road is:
Wherein, j ∈ L, L are trouble point to the set of all branch roads of root node.
The short circuit current of other non-faulting branch roads of system is:
WhereinL is trouble point to the set of all branch roads of root node.
In one specific embodiment, a feeder system of certain transformer station, application BFS layering number algorithm pair
Feed connection node is numbered, then node annexation after numbering and hierarchical relational as in figure 2 it is shown, its interior joint 8,11,13,
15,16,17,18,19,20,21,25,26 and 27 is transformer node.The line length of each branch road, circuit unit resistance in Fig. 2
As shown in table 1 with circuit unit reactance；The numbering of each transformer node in Fig. 2, transformer parameter are as shown in table 2.
Assuming that the three-phase voltage initial value of root node 0 is respectively as follows: Flow chart can obtain the rated load current of system the most as shown in Figure 3, the rated load electricity of each branch road
Stream is as shown in table 3.And then by each branch impedance in trouble point to root node and ask for the fault current of trouble point, finally lead to
Cross the rated load current of each branch road and the method for fault current addition of vectors to the electricity of each branch road after asking for system jam
Stream, in the case of the most each branch road generation three-phase shortcircuit, the short circuit current of each branch road is as shown in table 4；Each step down side generation three-phase
Under short-circuit conditions, flow through on high-tension side short circuit current as shown in table 5.When there is phase fault in circuit AB phase, each branch road short
Road electric current is as shown in table 6；When each step down side occurs AB phase phase fault, flow through short circuit current such as table 7 institute of trouble point
Show.
For verifying the validity of this short circuit current acquisition methods, the PSB tool box of MATLAB is utilized to build the imitative of this feeder line
True mode, as shown in Figure 4.Simulation model emulation is utilized to obtain, in the case of each branch road generation three-phase shortcircuit, the three-phase of each branch road
Short circuit current is as shown in table 8；In the case of each step down side generation three-phase shortcircuit, flow through on high-tension side short circuit current such as table
Shown in 9.When each branch road AB phase phase fault, the short circuit current flowing through trouble point is as shown in table 10；Send out at step down side
During raw AB phase phase fault, the short circuit current flowing through trouble point is as shown in table 11.
Each branch road simulation model gained short circuit current can be specified for explanation application as the standard value of this feeder line short circuit current
The correctness of short circuit current striked by the method that load current and fault current are added, each branch road three-phase of Fig. 5 visual representation is short
The acquired value of road electric current and the error of standard value；The each branch road AB phase phase fault of Fig. 6 visual representation, asking of A phase short circuit current
Value and the error of standard value.Striked by the method being added from Fig. 5 and Fig. 6, application rated load current and fault current
The method of short circuit current and the error of standard value, in the error range of 5%, can apply to during distribution protection adjusts, and this is joined
Net short circuit current setting method is simply effective, and reliably, and applicability is wide.
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Table 8
Table 9
Table 10
Table 11
The above, only present pre-ferred embodiments, therefore the scope that the present invention implements can not be limited according to this, i.e. depend on
The equivalence change that the scope of the claims of the present invention and description are made with modify, all should still belong in the range of the present invention contains.
Claims (5)
1. the short circuit current acquisition methods that distribution protection is adjusted, it is characterised in that: include
Step 1, obtains three-phase line parameter and transformer T-shaped equivalent transformation, and sets up power distribution network three-phase network equivalence mould according to this
Type；
Step 2, asks for the rated load current of power distribution network according to three-phase network Equivalent Model；Including:
Step 21, from the beginning of root node, carries out node serial number according to BFS method to network node, the most from top to bottom
Branch road is layered；
Step 22, arranges root node three-phase voltage initial value；
Step 23, calculates three phase of impedance under each branch road rated condition and transformation according to distribution network line and transformer equivalent model
Device reduction is on high-tension side equiva lent impedance and admittance；
Step 24, pushes back the rated load current asking for each branch road for method before utilizing distribution trend;
Step 3, utilizes trouble point in three-phase network Equivalent Model to the mode of root node equiva lent impedance to ask for the fault of power distribution network
Electric current；
Step 4, by asking for each branch, short-circuit electricity by the method for the rated load current of each branch road and fault current addition of vectors
Flow valuve.
The short circuit current acquisition methods that distribution protection the most according to claim 1 is adjusted, it is characterised in that: described step
In 1, obtain following parameter: r be the unit resistance of circuit, x be the unit reactance of circuit, l be leg length, RgFor the earth electricity
Resistance, XSMFor two-phase mutual impedance；
The impedance matrix Z of any one branch road of described three-phase lineLIt is expressed as:
This ZAA、ZBB、ZCCFor self-impedance, this circuit self-impedance is: Zss=rl+jxl；
This ZAB、ZBC、ZCAFor mutual impedance, this circuit mutual impedance is: ZSM=Rg+jXSM, Rg=π2×10-4F,
Wherein, f takes 50Hz, DgFor the current equivalence degree of depth in circuit；DSMFor the distance between circuit two-phase.
The short circuit current acquisition methods that distribution protection the most according to claim 1 is adjusted, it is characterised in that: described step
In 1, obtain following parameter: Δ PkRated load for transformer is lost；UNRated voltage for transformer；SNFor transformer
Rated capacity；Uk% is the percentage of transformer impedance drop；ΔP0Rated no-load for transformer is lost；I0% is transformer
The percentage of rated no-load current；
Described transformer each phase parameter after T-shaped equivalent transformation is represented by:
, wherein: RTFor becoming
The all-in resistance of depressor high-low pressure winding；XTTotal impedance for transformer high-low-voltage winding；GTConductance for transformer；BTFor transformation
The susceptance of device.
The short circuit current acquisition methods that distribution protection the most according to claim 1 is adjusted, it is characterised in that: described step
3, in three-phase network Equivalent Model, trouble point to the mode of root node equiva lent impedance is asked for the step of distribution network failure electric current and is included:
Step 31, calculates each branch road three-phase under the fault condition that is short-circuited according to distribution network line and transformer equivalent model
Impedance；
Step 32, calculate fault point be short-circuited the three-phase voltage after fault and calculate trouble point to each branch road of root node therefore
Barrier electric current.
The short circuit current acquisition methods that distribution protection the most according to claim 1 is adjusted, it is characterised in that: described each
Road short circuit current is each branch road rated load current and the superposition of fault current vector.
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| CN107766609A (en) * | 2017-09-06 | 2018-03-06 | 全球能源互联网研究院有限公司 | The stray inductance extracting method and device of a kind of IGBT module |
| CN110783897A (en) * | 2019-09-25 | 2020-02-11 | 北京交通大学 | GPU acceleration-based power grid short-circuit current parallel computing method and system |
| CN113659571A (en) * | 2021-08-13 | 2021-11-16 | 云南电网有限责任公司电力科学研究院 | Prediction device and method for predicting short-circuit current of power grid in-operation transformer in real time |
| CN114878963B (en) * | 2022-05-06 | 2023-01-06 | 广西电网有限责任公司 | Multi-source power distribution network short-circuit current extreme value calculation method based on CFO |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074939A (en) * | 2010-11-17 | 2011-05-25 | 华北电网有限公司 | Online examination method of relay protection setting value based on dynamic short-circuit current |
| CN102820648A (en) * | 2012-08-03 | 2012-12-12 | 冶金自动化研究设计院 | Method for reconstructing power distribution networks of iron and steel enterprises |
| CN103258301A (en) * | 2013-04-19 | 2013-08-21 | 国家电网公司 | Power supply reliability evaluating method applicable to county power grid |
| US8527932B2 (en) * | 2010-10-04 | 2013-09-03 | Ford Global Technologies, Llc | Method of optimizing automotive electrical wiring |
-
2013
- 2013-11-04 CN CN201310538157.5A patent/CN103560494B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8527932B2 (en) * | 2010-10-04 | 2013-09-03 | Ford Global Technologies, Llc | Method of optimizing automotive electrical wiring |
| CN102074939A (en) * | 2010-11-17 | 2011-05-25 | 华北电网有限公司 | Online examination method of relay protection setting value based on dynamic short-circuit current |
| CN102820648A (en) * | 2012-08-03 | 2012-12-12 | 冶金自动化研究设计院 | Method for reconstructing power distribution networks of iron and steel enterprises |
| CN103258301A (en) * | 2013-04-19 | 2013-08-21 | 国家电网公司 | Power supply reliability evaluating method applicable to county power grid |
Non-Patent Citations (2)
| Title |
|---|
| 变结构支路短路电流计算的复合序网法模型研究;罗庆跃等;《电力自动化设备》;20060630;第26卷(第6期);第13-15页 * |
| 基于GIS的配网潮流与网损计算的应用研究;张立国;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;20060815;第21-48页 * |
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