CN104407216A - Method for obtaining line parameters of power system - Google Patents
Method for obtaining line parameters of power system Download PDFInfo
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- CN104407216A CN104407216A CN201410578358.2A CN201410578358A CN104407216A CN 104407216 A CN104407216 A CN 104407216A CN 201410578358 A CN201410578358 A CN 201410578358A CN 104407216 A CN104407216 A CN 104407216A
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Abstract
The invention discloses a method for obtaining line parameters of a power system, which can ensure accuracy of calculation results, realizes batch calculation of multiple lines and greatly improves the efficiency. The method is realized through a computer and comprises the following steps: (1), obtaining pole and tower information, ground wire information, lead information and cable information which are included by a line needing to be calculated; (2), obtaining a pole and tower detail list: obtaining pole and tower models, ground wire models, lead models, cable models, spans, height differences, wiring forms and ground resistivity which are included by the line needing to be calculated; (3), selecting the line needing to be calculated; (4), calculating the line in the step (3) to obtain unit impedance of each stage of poles and towers, impedance of each stage of poles and towers and line impedance; and (5), storing the calculation results in the step (4).
Description
Technical field
The invention belongs to the technical field of electric power invention relay protection setting calculation, relate to a kind of method obtaining the line parameter circuit value of electric system particularly.
Background technology
As ensureing the important defence line that power system stability is run, relay protection must meet " selectivity ", " quick-action ", " sensitivity ", " reliability " these four basic demands (being called for short " four property ").The reliability of relay protection comprises mistake action and rejecting action two layers of meaning does not occur, and line parameter circuit value is the most basic foundation of computational scheme protection definite value, so will meet four property of relay protection, must ensure the accuracy of line parameter circuit value.
On-the-spot is all generally that the shaft tower all to this circuit manages to the management of circuit, and shaft tower has a variety of model, wire also has a variety of model, the mode of connection also has 9 kinds, therefore in order to the accuracy needs ensureing line parameter circuit value are according to different shaft towers, different wire ground wires, the different modes of connection carries out computing respectively, such use is manually come to calculate one by one and was both easily gone wrong, and also seems very loaded down with trivial details.
At present along with the increase day by day of electrical network scale, electric network composition is increasingly sophisticated, what the framework of various circuit also became thereupon becomes increasingly complex, the model of wire gets more and more, the circuit that grid company dispatching office at different levels is responsible for also gets more and more, thus the complexity of route parameter calculation work is increased substantially.And now mostly the unrealized circuit of company of county 100% survey, the theory calculate parameter that adopts more, computing method disunity, therefore a kind of can batch and to calculate the accurate method obtaining the line parameter circuit value of electric system be very necessary.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, and provide a kind of method obtaining the line parameter circuit value of electric system, it can ensure the accuracy of result of calculation, and the batch realizing many circuits calculates, and efficiency improves greatly.
Technical solution of the present invention is: the method for the line parameter circuit value of this acquisition electric system, and the method is realized by computing machine, and comprises the following steps:
(1) shaft tower information, ground wire information, wire information, cable information that calculative circuit comprises is obtained;
(2) shaft tower detail list is obtained: obtain shaft tower model, ground wire model, wire type, cable signal, span, the discrepancy in elevation, connection type, ground resistivity that calculative circuit comprises;
(3) calculative circuit is selected;
(4) circuit of step (3) is calculated, obtain shaft tower unit at different levels impedance, shaft tower impedance at different levels, line impedance;
(5) result of calculation of step (4) is preserved.
First this method by obtaining the shaft tower information detail list of many circuits, the mode of connection, wire type, ground wire information, span and the discrepancy in elevation, select calculative circuit afterwards, unified calculating is carried out to the circuit selected, once can calculate parameter in need easily, so the accuracy of result of calculation can be ensured, the batch realizing many circuits calculates, and efficiency improves greatly.
Accompanying drawing explanation
Fig. 1 shows the process flow diagram of the method for the line parameter circuit value according to acquisition electric system of the present invention;
Fig. 2 shows the process flow diagram of the step (4) of the method for the line parameter circuit value according to acquisition electric system of the present invention.
Embodiment
As shown in Figure 1-2, the method for the line parameter circuit value of this acquisition electric system, the method is realized by computing machine, and comprises the following steps:
(1) shaft tower information, ground wire information, wire information, cable information that calculative circuit comprises is obtained;
(2) shaft tower detail list is obtained: obtain shaft tower model, ground wire model, wire type, cable signal, span, the discrepancy in elevation, connection type, ground resistivity that calculative circuit comprises;
(3) calculative circuit is selected;
(4) circuit of step (3) is calculated, obtain shaft tower unit at different levels impedance, shaft tower impedance at different levels, line impedance;
(5) result of calculation of step (4) is preserved.
First this method by obtaining the shaft tower information detail list of many circuits, the mode of connection, wire type, ground wire information, span and the discrepancy in elevation, select calculative circuit afterwards, unified calculating is carried out to the circuit selected, once can calculate parameter in need easily, so the accuracy of result of calculation can be ensured, the batch realizing many circuits calculates, and efficiency improves greatly.
Preferably, the circuit in described step (3) is one or more.
Preferably, the line parameter circuit value obtaining every bar circuit in described step (4) comprises step by step following:
(4.1) shaft tower unit at different levels impedance is calculated: first obtain shaft tower model, ground wire model, conductor signal, cable model, the mode of connection, ground resistivity; Then the information of the corresponding model of database is found according to these models; Shaft tower unit at different levels impedance is calculated according to these information and computing formula again;
(4.2) shaft tower impedance at different levels is calculated: the length first calculating shaft tower at different levels according to span and the discrepancy in elevation; Then judge, show that circuit belongs to the length L of every one-level shaft tower; Afterwards the length belonging to every one-level shaft tower is multiplied by the impedance of shaft tower unit again and draws this grade of shaft tower impedance;
(4.3) computational scheme impedance: the shaft tower impedance of shaft tower at different levels is added, draws line impedance.In addition, in described step (4.2), judgement comprises step by step following:
A () is when this shaft tower is door frame:
If 1. this shaft tower wire type is pole line, then L is 0;
If 2. this shaft tower wire type is cable, then shaft tower unit positive sequence, zero sequence impedance are positive sequence, the zero sequence impedances of cable, and L is cable length; Cable positive sequence, zero sequence impedance are taken from: below the row that management > device parameter > cable information > is corresponding;
L takes from: management > input parameter > cable length;
B () be not when this shaft tower is door frame:
1. upper level shaft tower is door frame, and next stage shaft tower is not door frame:
2. upper level shaft tower is not door frame, and next stage shaft tower is not door frame:
3. upper level shaft tower is not door frame, and next stage shaft tower is door frame:
4. upper level shaft tower is door frame, and next stage shaft tower is door frame:
In formula: p is the correction factor of circuit, is defaulted as 1.
X
1, y
1for span and the discrepancy in elevation of upper level shaft tower
X
2, y
2for span and the discrepancy in elevation of this shaft tower.
Advantage of the present invention is as follows:
1. the batch achieving circuit calculates, and namely can calculate the parameter of many circuits simultaneously;
2., based on the calculating of shaft tower information, namely can calculate the line parameter circuit value of needs according to shaft tower information and shaft tower detail list.
The above; it is only preferred embodiment of the present invention; not any pro forma restriction is done to the present invention, every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong to the protection domain of technical solution of the present invention.
Claims (3)
1. obtain a method for the line parameter circuit value of electric system, it is characterized in that: the method is realized by computing machine, and comprise the following steps:
(1) shaft tower information, ground wire information, wire information, cable information that calculative circuit comprises is obtained;
(2) shaft tower detail list is obtained: obtain shaft tower model, ground wire model, wire type, cable signal, span, the discrepancy in elevation, connection type, ground resistivity that calculative circuit comprises;
(3) calculative circuit is selected;
(4) circuit of step (3) is calculated, obtain shaft tower unit at different levels impedance, shaft tower impedance at different levels, line impedance;
(5) result of calculation of step (4) is preserved.
2. the method for the line parameter circuit value of acquisition electric system according to claim 1, is characterized in that: the circuit in described step (3) is one or more.
3. the method for the line parameter circuit value of acquisition electric system according to claim 2, is characterized in that:
The line parameter circuit value obtaining every bar circuit in described step (4) comprises step by step following:
(4.1) shaft tower unit at different levels impedance is calculated: first obtain shaft tower model, ground wire model, conductor signal, cable model, the mode of connection, ground resistivity; Then the information of the corresponding model of database is found according to these models; Shaft tower unit at different levels impedance is calculated according to these information and computing formula again;
(4.2) shaft tower impedance at different levels is calculated: the length first calculating shaft tower at different levels according to span and the discrepancy in elevation; Then judge, show that circuit belongs to the length L of every one-level shaft tower; Afterwards the length belonging to every one-level shaft tower is multiplied by the impedance of shaft tower unit again and draws this grade of shaft tower impedance;
(4.3) computational scheme impedance: the shaft tower impedance of shaft tower at different levels is added, draws line impedance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410578358.2A CN104407216A (en) | 2014-10-24 | 2014-10-24 | Method for obtaining line parameters of power system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410578358.2A CN104407216A (en) | 2014-10-24 | 2014-10-24 | Method for obtaining line parameters of power system |
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| CN104407216A true CN104407216A (en) | 2015-03-11 |
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| CN201410578358.2A Pending CN104407216A (en) | 2014-10-24 | 2014-10-24 | Method for obtaining line parameters of power system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034117A (en) * | 2007-04-02 | 2007-09-12 | 武汉大学 | Power transmission line power frequency parameters measuring method and device |
| CN102707145A (en) * | 2012-05-29 | 2012-10-03 | 辽宁省电力有限公司沈阳供电公司 | Power frequency parameter calculation method of high voltage transmission line |
| CN103700300A (en) * | 2013-12-12 | 2014-04-02 | 深圳供电局有限公司 | Teaching simulation power transmission line and method for simulating power transmission line |
| CN104361209A (en) * | 2014-10-23 | 2015-02-18 | 国网甘肃省电力公司天水供电公司 | Method for obtaining line parameters under various frameworks |
-
2014
- 2014-10-24 CN CN201410578358.2A patent/CN104407216A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034117A (en) * | 2007-04-02 | 2007-09-12 | 武汉大学 | Power transmission line power frequency parameters measuring method and device |
| CN102707145A (en) * | 2012-05-29 | 2012-10-03 | 辽宁省电力有限公司沈阳供电公司 | Power frequency parameter calculation method of high voltage transmission line |
| CN103700300A (en) * | 2013-12-12 | 2014-04-02 | 深圳供电局有限公司 | Teaching simulation power transmission line and method for simulating power transmission line |
| CN104361209A (en) * | 2014-10-23 | 2015-02-18 | 国网甘肃省电力公司天水供电公司 | Method for obtaining line parameters under various frameworks |
Non-Patent Citations (3)
| Title |
|---|
| 周学君: "输电线参数测量方法", 《广东电力》 * |
| 翁军，黄柏麟: "《高压送电线路工频电气参数计算软件》开发与应用", 《电力建设》 * |
| 胡中慧，傅中 等: "500KV输电线路零序阻抗的测量及研究", 《电力系统保护与控制》 * |
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Application publication date: 20150311 |
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