CN106410785A - Anticipated fault-based open capacity pre-warning method of power distribution network - Google Patents
Anticipated fault-based open capacity pre-warning method of power distribution network Download PDFInfo
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- CN106410785A CN106410785A CN201610643228.1A CN201610643228A CN106410785A CN 106410785 A CN106410785 A CN 106410785A CN 201610643228 A CN201610643228 A CN 201610643228A CN 106410785 A CN106410785 A CN 106410785A
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- distribution network
- power distribution
- capacity
- open capacity
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000003466 anti-cipated effect Effects 0.000 title abstract 3
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 238000007363 ring formation reaction Methods 0.000 claims description 5
- 230000010354 integration Effects 0.000 claims description 4
- 239000000470 constituent Substances 0.000 claims description 3
- 238000011161 development Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 239000011159 matrix material Substances 0.000 description 12
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
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- 230000005540 biological transmission Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
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- 150000001875 compounds Chemical class 0.000 description 1
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- 238000007726 management method Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000012795 verification Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
Abstract
The invention relates to an anticipated fault-based open capacity pre-warning method of a power distribution network. The method comprises the following steps of (1) carrying out open capacity estimation on any feeder of the power distribution network; (2) for the open capacity obtained by appointed feeder estimation, scanning all other feeders which can form a ring together with the feeder; and (3) for any adjacent feeder, considering the load rate of transferring loads to the feeder through a tie switch after a serious fault (namely tripping of a feeder outlet switch). The anticipated fault-based open capacity pre-warning method of the power distribution network has the beneficial effects that the condition that key devices do not exceed the limit under different load levels is ensured, meanwhile, the condition that transformers and power circuits of various substations and related upper-stage transformers and power circuits meet the N-1 requirement is also ensured and important load circuits meet the N-2 requirement.
Description
Technical field
The present invention relates to the method for early warning of power distribution network, it is pre- that especially a kind of power distribution network based on forecast failure can open capacity
Alarm method.
Background technology
Power distribution network, when carrying out calculating analysis, has rack and safeguards that closed loop power flow cannot be according to current not in time at present
Grid calculating, often causes tripping operation during cyclization；Popularization with three pairs of wiring simultaneously and the relieving of new forms of energy access, county adjusts
The sole duty of fortune side all exists does not have calculating instrument to help its assessment modification scheme of three pairs of wiring and the assessment of new forms of energy access point
Scheme；Meanwhile, State Grid Corporation of China has issued 10-35 KV distribution net and can open capacity information release management method, county the beginning of the year
Tune needs satisfaction can open capacity and carry out calculating analysis requirement to power distribution network.Based on the above pent-up demand, this project is wished
Hope original province ground intelligence computation on the basis of, propulsion county tune to open exhibition 35kV and following electrical network Load flow calculation, cyclization verification,
" three pairs of wiring " optimizes, distributed energy accesses the work such as check, year mode layout, examining and analyzing, improves upper and lower level electrical network fortune
The integration of line mode, is that the safe and stable operation of power distribution network provides safeguard.
Issue 10-35 KV distribution net at the beginning of State Grid Corporation of China and can open Capacity Assessment tentative method, 10-35 kilovolt
Power distribution network can open capacity and should ensure that transformator, power circuit and related higher level's transformator, power circuit etc. of each transformer station set
Require for meeting N-1, important charge circuit will be met with N-2 and require.With the equipment previous year actual transmissions such as circuit, transformator
Maximum current based on calculated, and consider certain nargin.Therefore, it is possible to monthly be counted using the automatic method calculating
Calculate, the support data of Ye Kuo department provides convenient can be given.
Content of the invention
The invention solves the problems that the shortcoming of above-mentioned prior art, provide a kind of safety and stability, do not occur out-of-limit based on anticipation
The power distribution network of fault can open capacity-warning method.
The present invention solves the technical scheme of its technical problem employing：This power distribution network based on forecast failure can open capacity
Method for early warning, step is as follows：
(1) any one feeder line of distribution is carried out can open capacity and be estimated；
(2) the opened capacity that the assessment of specified feeder line is obtained, all other feedback of scanning and the possible cyclization of this feeder line
Line；
(3) for arbitrary adjacent feeders it is considered to catastrophe failure (i.e. feeder line gate out switch tripping operation) afterwards will by interconnection switch
Its lower on-load transfers to the load factor after this feeder line.
The issue principle that described opened capacity is estimated is to seek, for possessing, the unit joining insertion condition, pass through
System integration Real-Time Sharing can open capacity information；Join insertion condition for temporarily not possessing battalion, by development division, fortune inspection portion
Periodically provide power distribution network planning scheme, and equipment, circuit can open capacity information.0.4 kilovolt of industry expands project, directly open appearance
Amount, constituent parts can be according to practical situation, and determine electrical networks at different levels exempts from examination ＆ approval volumetric(al) standardss, is not less than 315 kilovolt-amperes in principle.
The issue principle that described opened capacity is estimated is that maximum load rate circuit below 70% exempts to examine；?
The circuit of heavy load rate 70%～85%, power supply station examines；The circuit of maximum load rate 85～100%, O＆M maintenance portion examines；
The circuit of maximum load rate more than 100%, wouldn't examine.
The invention has the advantages that：This invention ensures that each key equipment is not all out-of-limit under each load level, with
When also ensure that the transformator of each transformer station, power circuit and the equipment such as related higher level's transformator, power circuit meet N-1 will
Ask, important charge circuit will be met with N-2 and require.
Brief description
Fig. 1 be fault after power system schematic diagram.
Specific embodiment
The invention will be further described below：
This power distribution network based on forecast failure can open capacity-warning method, and step is as follows：
(1) any one feeder line of distribution is carried out can open capacity and be estimated；
(2) the opened capacity that the assessment of specified feeder line is obtained, all other feedback of scanning and the possible cyclization of this feeder line
Line；
(3) for arbitrary adjacent feeders it is considered to catastrophe failure (i.e. feeder line gate out switch tripping operation) afterwards will by interconnection switch
Its lower on-load transfers to the load factor after this feeder line.
The issue principle that the opened capacity that state's net is issued is estimated is to seek, for possessing, the unit joining insertion condition,
Capacity information can be opened by system integration Real-Time Sharing；Join insertion condition for temporarily not possessing battalion, by development division, fortune inspection
Portion periodically provides power distribution network planning scheme, and equipment, circuit can open capacity information.0.4 kilovolt of industry expands project, directly opens
Capacity, constituent parts can be according to practical situation, and determine electrical networks at different levels exempts from examination ＆ approval volumetric(al) standardss, is not less than 315 kilovolt-amperes in principle.
The issue principle that local the opened capacity implemented is estimated is that maximum load rate circuit below 70% exempts to examine
Batch；The circuit of maximum load rate 70%～85%, power supply station examines；The circuit of maximum load rate 85～100%, O＆M maintenance portion
Examination ＆ approval；The circuit of maximum load rate more than 100%, wouldn't examine.
Based on mentioned above principle, any one feeder line of distribution can be carried out opening capacity with being estimated, to protect
Demonstrate,prove distribution transforming, feeder line, main transformer etc. under each load level all not out-of-limit.
According to mentioned above principle issue opened capacity although can ensure that under each load level, key equipment is not all got over
Limit, but occur in that load shifts it is possible to generation equipment is out-of-limit after there is forecast failure.The method of the present invention is effective to be obtained
Prevent the problems referred to above, need on the basis of can opening Capacity Assessment it is considered to security constraint, carry out opening the pre- of capacity
Alert.
Algorithm steps for forecast failure are：
(1) fault impact element is separated from network, the promise calculating former network is paused equivalent parametersWithFor
Keep former electrical network constant, the method for negative impedance branch road in parallel can simulate the removal of this set of pieces, as shown in Figure 1.This figure
In,WithIt is the Norton equivalence of multiple-port network parameter of electrical network before fault, if these elements being affected by fault are to fault prosthomere
The contribution matrix y of point admittance matrix represents, accesses-y and is equivalent to remove this set of pieces from system, is affected by fault
This set of pieces be Y to the contribution of fault posterior nodal point admittance matrixf.The left side of aa ' axis is the electric power system model before fault,
Right side is the circuit (compensation circuit being also simulated failure and accessing) being affected part by fault, due to the different Y of faultfIt is
Change, work as YfDuring=y, this part resultant admittance is zero, represents and does not have fault to occur.As long as therefore can be aa ' axis right part
Description is clear, is then added to before the fault in left side in power system it is easy to calculate the electricity of post-fault system.
(2) calculate the admittance Δ Y being affected part by faultfWith the electric current flowing through compensation circuit
Calculate Δ YfWhen, the right side circuit of aa ' axis in Fig. 1 is carried out abbreviation process, eliminates internal node, only retain and
The port node of interface on the left of aa ' axis.
ΔYf=-y+Yf(1)
Calculate the electric current flowing through this partFormula as follows：
It should be noted that, this electric currentNot current in the fault point, but the compensation circuit accessing for simulated failure etc.
Electric current on value branch admittance.
(3) utilizeSeek the voltage of each node of electrical network after fault.
In formula,For grid nodes voltage column vector, Z before faultfSave in original grid nodes impedance matrix and port
The matrix of the corresponding row composition of point,Compensation injection current column vector for port.The essence of this formula is the section after fault
Before point voltage is equal to fault, voltage adds the change in voltage affecting due to fault.
Above step (1) and step (3) should be calculated using order components, because this part is that original electrical network is counted
Calculate, and the phase component of original electrical network is coupling, and order components are that three sequence decouplings are separate.Step (2) can be used
Phase component can also be calculated with order components, when being calculated using order components, YfIt is between sequence, to have coupling, other parameters are between sequence
Decoupling；When being calculated using phase component, YfIt is alternate decoupling, but other parameters are that alternate have coupling.Due to being fault
The element of impact is few, and the matrix order being related to calculate is not high, no matter is used which kind of component, amount of calculation is more or less the same.In software,
Calculate according to order components, now, (2) formula should be write as 0,1,2 coordinate form
Equally, (3) formula can be write as 0,1,2 coordinate form
It should be noted that,In formula (2)Difference be,Each of element be 3 × 3 diagonal
Wire matrix, diagonal element is the Equivalent admittance of zero sequence, positive sequence and negative phase-sequence respectively, equallyIn each element be 3 × 1 row
Matrix, only positive-sequence component, zero-sequence component and negative sequence component are 0.
This algorithm has unique distinction to the process of fault branch very much.The element that fault directly affects is drawn from network by it
Branch away, according to abort situation and type by element segments, increase node, form small-sized node admittance together with faulty circuit
Matrix, then processes this group node admittance matrix with order components or phase components method, eliminates newly-increased node and just can obtain Yf, then and-
Y constitutes the compensation admittance Δ Y that should access togetherfIt is added in former network.This method can keep that former network is constant, and fault causes
Correction be confined on minority element.
Different simple fault types, YfValue be different, the phase component of various simple fault circuit and order components
The impedance matrix of form and admittance matrix can be found in other documents.This algorithm can also simulate an increasingly complex set of pieces fault
Situation, such as generation cross line fault, or have the transmission line malfunction of Mutual Inductance Coupling, and multiple compound contingency.Divide for fault from now on
The extension of analysis function lays the foundation.
In addition to the implementation, the present invention can also have other embodiment.All employing equivalents or equivalent transformation shape
The technical scheme becoming, all falls within the protection domain of application claims.
Claims (3)
1. a kind of power distribution network based on forecast failure can open capacity-warning method, it is characterized in that：Step is as follows：
(1) any one feeder line of distribution is carried out can open capacity and be estimated；
(2) the opened capacity that the assessment of specified feeder line is obtained, all other feeder line of scanning and the possible cyclization of this feeder line；
(3) for arbitrary adjacent feeders it is considered to catastrophe failure (i.e. feeder line gate out switch tripping operation) passes through interconnection switch afterwards by under it
On-load transfers to the load factor after this feeder line.
2. the power distribution network based on forecast failure according to claim 1 can open capacity-warning method, it is characterized in that：Described
The issue principle that is estimated of opened capacity be, for the unit possessing battalion and joining insertion condition, real-time by the system integration
Share and can open capacity information；Join insertion condition for temporarily not possessing battalion, periodically provide power distribution network by development division, fortune inspection portion
Programme, and equipment, circuit can open capacity information.0.4 kilovolt of industry expands project, directly opens capacity, constituent parts can root
According to practical situation, determine electrical networks at different levels exempts from examination ＆ approval volumetric(al) standardss, is not less than 315 kilovolt-amperes in principle.
3. the power distribution network based on forecast failure according to claim 1 can open capacity-warning method, it is characterized in that：Described
The issue principle that is estimated of opened capacity be that maximum load rate circuit below 70% exempts to examine；Maximum load rate 70%
～85% circuit, power supply station examines；The circuit of maximum load rate 85～100%, O＆M maintenance portion examines；Maximum load rate
More than 100% circuit, wouldn't examine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610643228.1A CN106410785A (en) | 2016-08-08 | 2016-08-08 | Anticipated fault-based open capacity pre-warning method of power distribution network |
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| CN201610643228.1A CN106410785A (en) | 2016-08-08 | 2016-08-08 | Anticipated fault-based open capacity pre-warning method of power distribution network |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107221928A (en) * | 2017-05-23 | 2017-09-29 | 国网浙江省电力公司杭州供电公司 | A kind of feeder line based on TSC can access capacity calculation methods and location regulation method |
| CN112583006A (en) * | 2020-12-04 | 2021-03-30 | 国家电网有限公司 | Power distribution network load access decision and promotion method |
| CN114069606A (en) * | 2021-09-28 | 2022-02-18 | 国网安徽省电力有限公司滁州供电公司 | Automatic computing system for simulating load transfer during full shutdown of transformer substation |
-
2016
- 2016-08-08 CN CN201610643228.1A patent/CN106410785A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107221928A (en) * | 2017-05-23 | 2017-09-29 | 国网浙江省电力公司杭州供电公司 | A kind of feeder line based on TSC can access capacity calculation methods and location regulation method |
| CN107221928B (en) * | 2017-05-23 | 2024-02-06 | 国网浙江省电力公司杭州供电公司 | TSC-based feeder accessible capacity calculation method and position adjustment method |
| CN112583006A (en) * | 2020-12-04 | 2021-03-30 | 国家电网有限公司 | Power distribution network load access decision and promotion method |
| CN112583006B (en) * | 2020-12-04 | 2022-06-03 | 国家电网有限公司 | Power distribution network load access decision and promotion method |
| CN114069606A (en) * | 2021-09-28 | 2022-02-18 | 国网安徽省电力有限公司滁州供电公司 | Automatic computing system for simulating load transfer during full shutdown of transformer substation |
| CN114069606B (en) * | 2021-09-28 | 2023-06-06 | 国网安徽省电力有限公司滁州供电公司 | Automatic calculation system for simulating load transfer during complete stop of transformer substation |
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Application publication date: 20170215 |