CN110571772A - Power distribution network line automatic reclosing control method adaptive to distributed power supply access - Google Patents
Power distribution network line automatic reclosing control method adaptive to distributed power supply access Download PDFInfo
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- CN110571772A CN110571772A CN201911018882.3A CN201911018882A CN110571772A CN 110571772 A CN110571772 A CN 110571772A CN 201911018882 A CN201911018882 A CN 201911018882A CN 110571772 A CN110571772 A CN 110571772A
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- 238000009826 distribution Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000003044 adaptive effect Effects 0.000 title claims description 6
- 239000011159 matrix material Substances 0.000 claims abstract description 14
- 238000011217 control strategy Methods 0.000 claims abstract description 8
- 239000013598 vector Substances 0.000 claims description 18
- 238000010586 diagram Methods 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/063—Details concerning the co-operation of many similar arrangements, e.g. in a network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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Abstract
The invention provides a power distribution network line automatic reclosing control method suitable for distributed power supply access, which comprises the following steps: 1) establishing a distributed power supply associated line set network topology matrix; 2) setting a reclosing control word of a distributed power supply associated line set; 3) and determining a reclosing control strategy of the circuit containing the distributed power supply. The invention overcomes the defects that the reclosing is stopped and the reclosing needs to be manually switched when the operation mode is changed because the substation is not provided with the line PT in the distributed power supply access line of the power distribution network, effectively prevents the asynchronous reclosing of the distributed power supply access line, improves the power supply reliability, automatically adapts to various operation modes of the line and ensures the safe operation of the power distribution network.
Description
Technical Field
The invention relates to the technical field of relay protection and control of a power system, in particular to a power distribution network line automatic reclosing control method suitable for distributed power supply access.
Background
The power distribution network is arranged at the tail end of a power system, faults of the power distribution network frequently occur due to the fact that a network structure is complex, circuit elements are multiple, and the operating environment is severe, wherein transient faults account for a considerable proportion, and in order to improve power supply reliability, the automatic reclosing technology is widely adopted for power distribution network circuits.
With the access of a large number of distributed power supplies to a power distribution network, the operating characteristics and protection control of the power distribution network are remarkably changed, and if the access line of the distributed power supplies fails, the system side and the distributed power supplies are switched on asynchronously by adopting a conventional reclosing method, so that impact current seriously endangering equipment safety is generated.
In order to prevent asynchronous switching-on, a voltage detection reclosing mode or a reclosing quitting mode is mainly adopted at present, a line PT needs to be arranged on a substation outgoing line side by adopting the voltage detection reclosing mode, at present, lines PT are rarely arranged on a substation side of a distribution network line of 35kV or below, the pressure of high-quality service and reliable power supply is forced, and power failure transformation is difficult to realize, so that the reclosing quitting mode is basically adopted for a distributed power supply access line under most conditions, and the power supply reliability is greatly influenced.
Distribution network line is because of operation mode adjustment such as maintenance, accident handling frequently, and the distributed generator access line changes each time and all needs the relevant net twine reclosing mode of manual adjustment, and distribution network line contacts many, rack structure is complicated in addition, and frequent complicated fortune square adjustment has invisibly increased regulators's operating pressure, makes distribution network safety in production face severe examination.
disclosure of Invention
The invention provides a power distribution network line automatic reclosing control method adaptive to distributed power supply access, and aims to improve the power supply reliability of the distributed power supply access line and automatically adapt to the operation mode adjustment of the distributed power supply access line.
the technical solution of the invention is as follows: a power distribution network line automatic reclosing control method adapting to distributed power supply access comprises the following steps:
(1) establishing a distributed power supply associated line set network topology matrix;
(2) setting a reclosing control word of a distributed power supply associated line set;
(3) And determining a reclosing control strategy of the circuit containing the distributed power supply.
The distributed power supply associated line set is a set formed by a distributed power supply access line and a handle contact line thereof in a normal operation mode, and is referred to as an associated set for short.
further, the step (1) of establishing the distributed power supply associated line set network topology matrix specifically includes:
1-1) reading a single line diagram of all lines in an association set from a device asset management system (PMS), the ith line forIndicates that i =1, 2, …, p,pThe number of lines in the relevant concentration is;
1-2) each lineAll distribution automation switches capable of forming ring network operation are numbered according to the single line diagram pole number by taking the transformer substation switch as the starting point, andAcquiring real-time position information of a switch;
1-3) each distributed power supplyMarked according to the single line rod number in the access line ring network,j=1，2，…，q，qFor correlating the number of centralized distributed power supplies, the circuit is operated in normal modeThe number of distributed power supplies contained is recorded as；
1-4) connecting all the associated circuits according to the connection relation of the handles of all the circuits in the association set, the on-off state of the switches and the access positions of the distributed power supplies to form the circuitsAn association set network topology matrix.
further, the step (2) of setting a reclosing control word of the distributed power supply associated line set specifically includes:
2-1) read lineAssociating each switch position signal and a transformer substation switch accident signal in the network topology matrix;
2-2) if the lineIf the switch is shifted, the step 2-3) is carried out, otherwise, the step 2-1) is returned;
2-3) if the lineIf no substation switch accident signal exists, the step 2-4 is carried out, otherwise, the step (3) is carried out;
2-4) according to the lineFrom substation switches to distributed power suppliesSwitching position signals between the access positions forming a circuitTo distributed power supplyadjustment vector of the square of the fortune，i=1，2，…，p，j=1，2，…，qWherein, in the step (A),
，
In the formula (I), the compound is shown in the specification,k=1，2，…，，as a linefrom substation switches to distributed power suppliesThe number of switches between the access positions,Is composed ofan order row vector;
2-5) on the lineAdjustment vector of the square of the fortuneScreening out vectors with all elements being 1 to obtain；
2-6) vectors that will satisfy the conditions of 1-5)the highest order is recorded asThe corresponding distributed power supply number is；
2-7) vectors that will satisfy the conditions of 1-5)number to；
2-8) ifThen lineReclosing control wordsetting to 0, withdrawing the reclosing of the line substation switch, if soThen linereclosing control wordand setting the value to be 1, and starting the reclosing of the line substation switch.
Further, the specific step of determining that the distributed power supply line reclosing control strategy is included in the step (3) includes:
3-1) reading switch accident signals of each line transformer substation in the association set;
3-2) if the lineAccident and reclosing control wordIf the value is 0, entering the step 3-3), otherwise, returning to the step 3-1);
3-3) connecting the linesNumber of reclosure countsSetting to 0;
3-4) read linefrom substation switches to distributed power suppliesVoltage signals connected between pole numbers and on two sides of distribution automatic switch、，f=1，2，…，；
3-5) ifAnd isAnd is，f=1，2，…，If yes, entering the step 3-6), otherwise, ending the process;
in the formuladetermining a limit value for the line without pressure;
3-6) time delaytSecond closing circuitSwitch and circuit of transformer substationNumber of reclosure counts；
WhereintThe reclosing time.
the invention has the beneficial effects that:
The invention overcomes the defects that the reclosing of a distributed power supply access line of a power distribution network is stopped because no line PT is installed on the outgoing line side of a transformer substation, and the reclosing of associated lines needs to be manually switched after the operation mode is adjusted.
Drawings
FIG. 1 is a flow chart of a control method for automatic reclosing of a power distribution network line, which is suitable for distributed power supply access, according to the invention;
FIG. 2 is a diagram of a three-segment two-contact three-power-supply-associated line set representative network topology matrix;
FIG. 3 is a flow chart of a method for setting a distributed power supply associated line set reclosing control word;
Fig. 4 is a flowchart of a control strategy for determining a reclosing lock of a line with distributed power.
in fig. 2, 1-0, 2-0, 3-0, and 4-0 are numbers of corresponding line substation switches, respectively, 1-1, 1-16, 1-29, 1-41, 2-23, 2-9, 2-1, 3-95, 3-61, 3-27, 3-1, 4-89, 4-56, 4-31, and 4-1 are numbers of corresponding line distribution automation switch single line diagrams, respectively, and 1-7, 2-28, and 4-47 are access positions of corresponding line distributed power supplies on the single line diagram, respectively.
Detailed Description
the present invention will be described in further detail with reference to the following drawings and specific examples, but the present invention is not limited to the following embodiments.
As shown in fig. 1, the method for controlling reclosing of a power distribution network line suitable for distributed power access according to the present invention includes the following steps:
Step 1, establishing a distributed power supply associated line set network topology matrix;
FIG. 2 is a diagram of a three-segment two-contact three-distributed power source associated line set representative network topology matrix, in this particular embodiment, a single line diagram of all lines in the associated set is read from a device asset management system (PMS) system, the single line diagram representing all devices actually connected to a line of a power distribution network, the secondiLine circuitit is shown that,i=1，2，…，p，pFor associating the number of lines in the set, each lineNumbering all distribution automation switches capable of forming ring network operation according to single line diagram pole numbers by taking a transformer substation switch as a starting point, and acquiring real-time position information of the switches through a distribution automation system; each distributed power supplyMarked according to the single line rod number in the access line ring network,j=1，2，…，q，qFor correlating the number of centralized distributed power supplies, under the normal operation modeThe number of distributed power supplies contained is recorded as(ii) a And connecting the associated lines according to the connection relation of the handles of each line in the associated set, the on-off state of the switches and the access positions of the distributed power supplies to form an associated set network topology matrix.
Step 2, setting a reclosing control word of the distributed power supply associated line set;
FIG. 3 is a flow chart of a control word for setting a reclosing lock of a distributed power source associated line set, which is accompanied by a switch shift signal when the operation mode of the line is adjusted, in this embodiment, the line is read from the distribution automation systemAssociating switch position signals in the network topology matrix with substation switch accident signals, uploading the distribution automation switch position signals by a distribution automation terminal, synthesizing the substation switch accident signals by 'protection action signals + switch accident opening signals', and uploading the signals by a substation protection device; if the circuit isIf there is switch deflection and there is no accident signal of transformer substation switch, then according to the linefrom substation switches to distributed power suppliesSwitching position signals between the access positions forming a circuitTo distributed power supplyadjustment vector of the square of the fortune，i=1，2，…，p，j=1，2，…，qWherein, in the step (A),
In the formula (I), the compound is shown in the specification,k=1，2，…，，As a linefrom power transformation switches to distributed power suppliesThe number of switches between the access positions,Is composed ofAn order row vector;
if the circuit isFrom substation switches to distributed power suppliesif the switches between the access positions are all in the closed position, the distributed power supply is indicatedis connected to the lineThus will routeadjustment vector of the square of the fortunescreening out the vector with all elements being 1 to obtainWill vectorNumber toand extracting the vectorHighest order numberto characterize the lineThe distributed power supply position farthest away from the switch of the transformer substation corresponds to the distributed power supply with the serial number of(ii) a If it isThen, it indicates the lineAt least 1 distributed power supply with reclosing control wordSetting the voltage value to be 0, and withdrawing the transformer substation switch reclosing soft pressing plate; if it isthen, it indicates the linewithout distributed power supply, its reclosing control wordAnd setting the voltage to be 1, and switching on a reclosing soft pressing plate of the transformer substation switch.
Step 3, determining a reclosing control strategy of the circuit containing the distributed power supply;
Fig. 4 is a flow chart of a reclosing control strategy for a line with a distributed power supply, in this embodiment, substation switching accident signals of each line in an association set are read, the substation switching accident signals can be synthesized by a "protection action signal + a switching accident opening signal", the substation switching accident signals are uploaded by a substation protection device, and the substation switching accident signals are recorded once from action to resetting; if the circuit isAccident and reclosing control wordthe value is 0, the fault happens to the line containing the distributed power supply, and the reclosing count is carried outSet to 0, read lineDistributed power supply from substation switch to farthest distanceVoltage signals connected between pole numbers and on two sides of distribution automatic switch、，f=1，2，…，，、The PT on two sides of the distribution automation switch are collected and uploaded through an automation terminal, if the PT is collected and uploaded through the automation terminalAnd isAnd isDescription of the circuitsWhen the pressure reaches the non-pressure limit value and no coincidence occurs, the time is delayedtSecond closing circuitSwitch of transformer substation, its reclosing count numberThereby realizing a circuitNon-pressure coincidence is realized, and asynchronous switching on with a distributed power supply is avoided;Typically 5% of the rated line voltage can be achieved,tcan be taken as 5 in generals。
Claims (5)
1. A power distribution network line automatic reclosing control method adaptive to distributed power supply access is characterized by comprising the following steps:
(1) Establishing a distributed power supply associated line set network topology matrix;
(2) Setting a reclosing control word of a distributed power supply associated line set;
(3) and determining a reclosing control strategy of the circuit containing the distributed power supply.
2. the method for controlling automatic reclosing of a power distribution network line adaptive to distributed power access according to claim 1, wherein the specific step of establishing the network topology matrix of the distributed power association line set in the step (1) comprises:
1-1) reading a single line diagram of all lines in the associative set from the production management system, secondiline circuitIt is shown that,i=1，2，…，p，pThe number of lines in the relevant concentration is;
1-2) each lineNumbering all distribution automation switches capable of forming ring network operation according to single line diagram pole numbers by taking a transformer substation switch as a starting point, and acquiring real-time position information of the switches;
1-3) each distributed power supplyMarked according to the single line rod number in the access line ring network,j=1，2，…，q，qfor correlating the number of centralized distributed power supplies, the circuit is operated in normal modeThe number of distributed power supplies contained is recorded as；
1-4) connecting all the associated circuits according to the connection relation of the handles of all the circuits in the association set, the on-off state of the switches and the access positions of the distributed power supplies to form the circuitsan association set network topology matrix.
3. The method for controlling automatic reclosing of a power distribution network line adapting to distributed power access according to claim 1, wherein the specific step of setting a reclosing control word of a distributed power associated line set in the step (2) comprises:
2-1) reading each switch position signal and a transformer substation switch accident signal in the association set network topology matrix;
2-2) if the lineif the switch is shifted, the step 2-3) is carried out, otherwise, the step 2-1) is returned;
2-3) if the lineif no substation switch accident signal exists, the step 2-4 is carried out, otherwise, the step (3) is carried out;
2-4) according to the linefrom substation switches to distributed power suppliesSwitching position signals between the access positions forming a circuitTo distributed power supplyAdjustment vector of the square of the fortune，i=1，2，…，p，j=1，2，…，qWherein, in the step (A),
，
in the formula (I), the compound is shown in the specification,k=1，2，…，，As a lineFrom substation switches to distributed power suppliesThe number of switches between the access positions,Is composed ofAn order row vector;
2-5) on the lineAdjustment vector of the square of the fortunescreening out vectors with all elements being 1 to obtain；
2-6) vectors that will satisfy the conditions of 2-5)The highest order is recorded asThe corresponding distributed power supply number is；
2-7) vectors that will satisfy the conditions of 2-5)Number to；
2-8) ifN i greater than or equal to 1, the linereclosing control wordsetting to 0, withdrawing the reclosing of the line substation switch, if soThen linereclosing control wordAnd setting the value to be 1, and starting the reclosing of the line substation switch.
4. the method for controlling automatic reclosing of power distribution network lines adapting to distributed power access according to claim 3, wherein the specific step of determining that the control strategy of reclosing of the power distribution network lines comprises the following steps:
3-1) reading switch accident signals of each line transformer substation in the association set;
3-2) if the lineAccident and reclosing control wordif the value is 0, entering 3-3), otherwise, returning to 3-1);
3-3) connecting the linesNumber of reclosure countsSetting to 0;
3-4) read lineFrom substation switches to distributed power suppliesVoltage signal connected between pole numbers and on two sides of distribution automatic switchNumber (C)、，f=1，2，…，；
3-5) ifAnd isand is，f=1，2，…，If so, entering 3-6), otherwise, ending the flow;
In the formuladetermining a limit value for the line without pressure;
3-6) time delaytSecond closing circuitSwitch and circuit of transformer substationNumber of reclosure counts；
WhereintThe reclosing time.
5. The method for controlling automatic reclosing of a power distribution network line adaptive to distributed power access according to any one of claims 2 to 4, wherein the association set is a distributed power association line set, specifically a set consisting of a distributed power access line and a handle contact line thereof in a normal operation mode.
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2019
- 2019-10-24 CN CN201911018882.3A patent/CN110571772B/en active Active
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| US20150081126A1 (en) * | 2013-07-16 | 2015-03-19 | GridEdge Networks, Inc. | Method and system for distributed generation trip protection using power line carrier signaling |
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| CN103944153A (en) * | 2014-04-25 | 2014-07-23 | 湖南大学 | Self-adaption intelligent protection method for power distribution network applied to high-permeability distributed power supply |
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