CN102916406A - Self-adaption braking method for regional networked differential protection - Google Patents
Self-adaption braking method for regional networked differential protection Download PDFInfo
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- CN102916406A CN102916406A CN2011104451247A CN201110445124A CN102916406A CN 102916406 A CN102916406 A CN 102916406A CN 2011104451247 A CN2011104451247 A CN 2011104451247A CN 201110445124 A CN201110445124 A CN 201110445124A CN 102916406 A CN102916406 A CN 102916406A
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Abstract
The invention relates to a self-adaption braking method for regional networked differential protection (DP). The method comprises the following steps: creating an association link table of each network node according to connection relationships of other network nodes in DP associated with each network node in a regional network; collecting status quantity information and analog quantity information transmitted by each breaker, and calculating a variable quantity of the current of each network node; selecting the network node with the maximum variable quantity of the current as a fault point if an abnormal variation of the current of the network node is detected; acquiring the number of the network nodes associated with the fault point in the association link tables of the network nodes, and adaptively performing main back-up protection on the fault point to select a braking equation according to the numerical value; and if the equation is met, performing protection actions and tripping associated breakers off. In the method, different braking equations and braking coefficients are selected for protected objects adaptively according to the number of the network nodes in the DP, thereby ensuring enough sensitivity in different situations. In addition, no person is needed to participate in setting.
Description
Technical field
The invention belongs to the Relay Protection Technology in Power System field, relate to a kind of self adaptation differential protection braking method that is applied to the centralized protection of regional power grid.
Background technology
In the Regional Networked relaying protection system by high-performance, independently communication system can obtain the current information of a plurality of measurement points easily; can not only finished surface to the differential protection function of independent electric component; can also realize towards the differential protection function in the zone that is formed by a plurality of independent electric components, the current differential protection of quick action, highly sensitive, function admirable is provided for electric power system.
Regional Networked protects main backup protection all to adopt Differential Protection Theory, and main protection Fault Isolation scope definition is all switches that directly link to each other with the fault point, and CT does the multiterminal differential protection with these switches, all switches that tripping links to each other with the fault point during protection action.When backup protection is defined as or malfunctioning switch unusual as a switch CT in the main protection isolation range; all switch CT node currents and this unusual switch CT electric current of replacement of directly linking to each other with switch therewith carry out the multiterminal differential protection with the CT electric current that other fault point directly links to each other; when action protection except all switches that tripping links to each other with the fault point, all switches of also wanting unusual with CT or the malfunctioning switch of tripping directly to link to each other.When a plurality of switches are unusual, the same processing.
Networking current differential protection principle is substantially the same with GPF (General Protection False; also be to satisfy Kirchhoff's current law (KCL); difference is; the object of protection of conventional current differential protection is single electric component, and the object of protection of Regional Networked current differential protection is a zone that comprises a plurality of single electric components.Now not high about the general sensitivity of the braking of Regional Networked differential protection, and need artificial the participation to adjust.
Summary of the invention
The purpose of this invention is to provide a kind of Regional Networked differential protection self adaptation braking method, need the problem of people as adjusting to solve compartmentalization network differential protection braking characteristic.
For achieving the above object, Regional Networked differential protection self adaptation braking method step of the present invention is as follows:
(1) the Regional Networked differential protection is set up the related chained list of each network node according to the annexation of other network nodes in the associated differential protection of each network node in the Local Area Network;
(2) gather by the quantity of state information and the analog quantity information that send on each network node, and calculate each network node current change quantity;
(3) if detecting certain network node electric current abnormal changes, then choose the network node of current anomaly variable quantity maximum as the fault point;
(4) obtain the number of network node that is associated with the fault point in the related chained list of network node, and carry out main backup protection for the fault point and choose the braking equation according to this numerical value is adaptive; Satisfy the circuit breaker that equation then protects action and tripping to be associated.
Further, the associated differential protection of each network node comprises main protection and backup protection in the described step (1).
Further, the number of network node that is associated with the fault point in the described step (4) comprises fault point itself, carries out main backup protection for the fault point and chooses the braking equation according to this numerical value is adaptive, and when numerical value was 2, the braking equation was | I
φ 1+ I
φ 2|＞k*|I
φ 1-I
φ 2|, k=0.7 wherein, when numerical value greater than 2 the time, the braking equation is
Wherein n is the integer greater than 2, and k is the coefficient of ratio, I
φ nIt is the current value of n network node that is associated with the fault point.
Further, described coefficient of ratio k is according to the size adaptation adjustment of n, and when 2＜n≤5, k is 0.5, and when 5＜n≤12, k is 0.6, and when n＞12, k is 0.3.
Further, described network node is to be connected into each interior branch road of regional power grid scope or the circuit breaker on the branch road.
Regional Networked differential protection self adaptation braking method of the present invention is at first during Sampling network node current ANOMALOUS VARIATIONS, take the network node of current change quantity maximum as the fault point, transfer the related chained list of this fault point, and carrying out main backup protection for the fault point and choose the braking equation according to the network node size adaptation of this fault point association; If satisfy the circuit breaker that equation then protects action and tripping to be associated; this method is chosen different braking equation and restraint coefficient according to the quantity that participates in the differential protection network node is adaptive for protected object; guaranteeing has enough sensitivity in different situations, and does not need to think and participate in adjusting.
Description of drawings
Fig. 1 is flow chart of the present invention;
Fig. 2 is allocation plan of system of embodiment;
Fig. 3 is the 1DL chained list schematic diagram by the topology generation of embodiment.
Embodiment
The structure of regional power grid centralized network protection is by centralized protective device, communication network and the comprehensive intelligent cell formation is installed on the spot, and Differential Protection Theory is adopted in regional power grid centralized network protection main protection, and the differential protection with the time limit is adopted in backup protection.Regional Networked differential protection self adaptation braking method as shown in Figure 1, concrete steps are as follows:
(1) the Regional Networked differential protection is according to the annexation of other network nodes in the associated differential protection of each network node in the Local Area Network, set up the related chained list of each network node, network node can be each branch road of being connected into bus or the circuit breaker on the branch road, differential protection main protection and backup protection;
(2) gather quantity of state information and the analog quantity information that send on each network node (circuit breaker), and calculate each network node current change quantity;
(3) if detecting certain network node electric current abnormal changes, then choose the network node of current anomaly variable quantity maximum as the fault point;
(4) obtain the number of network node that is associated with the fault point in the related chained list of network node, and carry out main backup protection for the fault point and choose the braking equation according to this numerical value is adaptive; Satisfy the circuit breaker that equation then protects action and tripping to be associated.
The number of network node that is associated with the fault point comprises fault point itself, carries out main backup protection for the fault point and chooses the braking equation according to this numerical value is adaptive, and when numerical value was 2, the braking equation was | I
φ 1+ I
φ 2|＞k*|I
φ 1-I
φ 2|, k=0.7 wherein, when numerical value greater than 2 the time, the braking equation is
Wherein n is the integer greater than 2, and k is the coefficient of ratio, I
φ nIt is the current value of n network node that is associated with the fault point.Coefficient of ratio k is according to the size adaptation adjustment of n, and when 2＜n≤5, k is 0.5, and when 5＜n≤12, k is 0.6, and when n＞12, k is 0.3.
Below in conjunction with Fig. 2 and Fig. 3 Regional Networked differential protection self adaptation braking method is elaborated:
Be the network diagram of primary system such as Fig. 2, Fig. 3 is the related chained list of the 1DL that generated by topological structure.Can be divided into 5 branch road L1 (containing 1DL, 8DL does differential), L2 (2DL, 9DL), L3 (10DL, 3DL), B1 (4DL, 6DL, 7DL) and (1DL, 2DL, 5DL, 3DL, 4DL); The collection of the magnitude of current is carried out as the collection point take each circuit breaker.L1 line failure among Fig. 2, networked protective device is at first selected the L1 line failure, then dispatches the differential main protection of circuit L1 and the main protection of the associated bus of 1DL.Input formula 1 and formula 2 carry out respectively the calculating of differential main protection, satisfy the circuit breaker that equation then protects action and tripping to be associated.
Wherein
Wherein
What the braking equation of formula 1 adopted is the phasor difference of both sides electric current, and the braking equation of formula 2 adopts be the multiterminal electric current absolute value and.If this is the length in identification 1DL chained list both sides was 2 (containing contact own) then uses formula 1, if chained list length greater than 2, then uses formula 2 to carry out.
When the CT of main protection association or malfunctioning switch; during such as the 5DL malfunctioning switch; need to utilize the adaptive increase protection range of topological structure; namely adopt 1DL; 2DL; 3DL; the electric current of four nodes of 4DL is finished differential backup protection; need to choose different braking characteristics this moment for the differential backup protection of networking; the Regional Networked backup protection is because the parts number that connects is more, and the differential equation that adopts formula 2 to carry out can cause sensitivity, therefore considers the method according to the automatic coefficient of how many self adaptation adjustment rates that participates in computing element; shown in formula 3,4.
Symbol implication in formula (1)-(4) and the accompanying drawing:
I
dBe differential current, I
rBe stalling current, k is restraint coefficient, I
φ nBe the electric current of fault branch n, the network node quantity of n for being associated with the fault point, DL is circuit breaker, and B1 is transformer, and NULL represents the link without next stage.
Claims (5)
1. Regional Networked differential protection self adaptation braking method is characterized in that the step of the method is as follows:
(1) the Regional Networked differential protection is set up the related chained list of each network node according to the annexation of other network nodes in the associated differential protection of each network node in the Local Area Network;
(2) gather quantity of state information and the analog quantity information that send on each network node, and calculate each network node current change quantity;
(3) if detecting certain network node electric current changes, then choose the network node of current change quantity maximum as the fault point;
(4) obtain the number of network node that is associated with the fault point in the related chained list of network node, and carry out main backup protection for the fault point and choose the braking equation according to this numerical value is adaptive; Satisfy the circuit breaker that equation then protects action and tripping to be associated.
2. Regional Networked differential protection adaptive approach according to claim 1, it is characterized in that: the associated differential protection of each network node comprises main protection and backup protection in the described step (1).
3. Regional Networked differential protection self adaptation braking method according to claim 2; it is characterized in that; the number of network node that is associated with the fault point in the described step (4) comprises fault point itself; carry out main backup protection for the fault point and choose the braking equation according to this numerical value is adaptive; when numerical value was 2, the braking equation was
, k=0.7 wherein, when numerical value greater than 2 the time, the braking equation is
, wherein n is the integer greater than 2, k is the coefficient of ratio,
It is the current value of n network node that is associated with the fault point.
4. Regional Networked differential protection self adaptation braking method according to claim 3 is characterized in that, described coefficient of ratio k is according to the size adaptation adjustment of n, when
The time, k is 0.5, when
The time, k is 0.6, when
The time, k is 0.3.
5. each described Regional Networked differential protection adaptive approach is characterized in that according to claim 1-4, and described network node is to be connected into each interior branch road of regional power grid scope or the circuit breaker on the branch road.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109075566A (en) * | 2016-04-13 | 2018-12-21 | 通用电器技术有限公司 | The method for operating differential protection scheme |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001197656A (en) * | 2000-01-07 | 2001-07-19 | Meidensha Corp | Relay for protecting current differential operation of power transmission line |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001197656A (en) * | 2000-01-07 | 2001-07-19 | Meidensha Corp | Relay for protecting current differential operation of power transmission line |
Non-Patent Citations (2)
| Title |
|---|
| 刘静: "《T型线路电流差动保护方案研究》", 《中国优秀硕士学位论文全文数据库》 * |
| 汤俊: "《电网广域电流差动保护算法研究》", 《中国优秀硕士学位论文全文数据库》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109075566A (en) * | 2016-04-13 | 2018-12-21 | 通用电器技术有限公司 | The method for operating differential protection scheme |
| CN109075566B (en) * | 2016-04-13 | 2020-04-07 | 通用电器技术有限公司 | Method of operating a differential protection scheme |
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