CN103779964B - Stability limitation monitoring method - Google Patents
Stability limitation monitoring method Download PDFInfo
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- CN103779964B CN103779964B CN201410013474.XA CN201410013474A CN103779964B CN 103779964 B CN103779964 B CN 103779964B CN 201410013474 A CN201410013474 A CN 201410013474A CN 103779964 B CN103779964 B CN 103779964B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/40—Display of information, e.g. of data or controls
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a stable-limit monitoring method and relates to the field of power grid and solves a technical problem that in the prior technology, monitoring work load of a multi-level step digital combination limit method is large. In the limit monitoring method, according to a power-flow change of a second line after trip of a first line, a coefficient of power-flow transference of the first line to the second line is calculated and according to an instant power-flow value of the first line, an instant power-flow value of the second line and the coefficient of power-flow transference of the first line to the second line, the power-flow value of the second line after the trip of the first line is obtained and monitored so as to be smaller than a rated load power flow of the second line so that it can be ensured that after trip of any of the lines, overload does not happen in the other line. The stable-limit monitoring method is applicable to power-flow monitoring of power-grid fault faces.
Description
[technical field]
The present invention relates to electrical network field, especially a kind of limit method for supervising
[background technology]
Existing electrical network section limit mode provides so that discrete type is digital, for multi-line form section often use many grades of ladder combination of numbers limits, as control circuit 1 trend be less than 500MW while control circuit 2 trend be less than 500MW; And when circuit 1 trend does not reach 600MW more than 500MW, need control circuit 2 trend to be less than 400MW; When circuit 1 trend does not reach 700MW more than 600MW, control circuit 2 trend is needed to be less than 300MW.Another circuit overload is caused after preventing a wherein tripping operation by which.But the method for supervising of this section tidal current lacks operability in actual electric network is run, and operating process needs to monitor each road trend, increase monitoring workload.And the power supply capacity utilizing electrical network can not be given full play to by which.
[summary of the invention]
The invention provides a kind of stability limitation method for supervising, realize visual linear limit, directly perceived, easy, accurate.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of stability limitation method for supervising, comprises the following steps:
A. power flow transfer coefficient is calculated, electrical network comprises first line and the second circuit, the current trend value of first line is a, the current trend value of the second circuit is b, after first line tripping operation, the trend value of first line becomes 0, and now the trend value of the second circuit becomes b ', can obtain first line to the power flow transfer coefficient r=of the second circuit (b '-b)/a;
B. calculate the trend value of rear second circuit of first line tripping operation, the instantaneous trend value of first line is A, and the instantaneous trend value of the second circuit is B, the trend value C=A*r+B of the second circuit after first line tripping operation;
C., in monitoring system, after the tripping operation of monitoring first line, the change of the trend value C of the second circuit, controls the rated load trend that this value is less than the second circuit;
D., when the rated load trend of the trend value C of the second circuit after first line tripping operation close to the second circuit, reduce the trend value of first line or reduce the trend value of the second circuit.
Further, described monitoring system comprises display screen, the change curve of trend value C of rear second circuit of described display screen display first line tripping operation and the rated load trend index line of the second circuit, the peak value of change curve takes b step close to during rated load trend index line.
Further, described power flow transfer coefficient is relevant to electrical network parameter, and when trend changes, transfer ratio remains unchanged.
Beneficial effect of the present invention:
Stability limitation method for supervising of the present invention, according to the change of the trend of the second circuit after first line tripping operation, calculate the power flow transfer coefficient of first line to the second circuit, according to the instantaneous trend value of first line, the instantaneous trend value of the second circuit and the power flow transfer coefficient of first line to the second circuit draw the trend value C of rear second circuit of first line tripping operation, monitoring C value is less than the rated load trend of the second circuit, after wherein a certain road tripping operation can be ensured, another road can not be transshipped, a section is integrated into by needing the multiple sections paid close attention to, only need the trend value monitoring this section to reflect whether the required multiple section tidal currents controlled are out-of-limit comprehensively, directly perceived accurately easy, very clear, reduce monitoring difficulty, alleviate monitoring workload.
These features of the present invention and advantage will be detailed in detailed description of the invention below exposure.
[detailed description of the invention]
A kind of stability limitation method for supervising provided by the invention, comprises the following steps:
Step one, calculate power flow transfer coefficient, the current trend value of first line is a, the current trend value of the second circuit is b, after first line tripping operation, the trend value of first line becomes 0, and now the trend value of the second circuit becomes b ', can obtain first line to the power flow transfer coefficient r=of the second circuit (b '-b)/a; It should be noted that power flow transfer coefficient is relevant to electrical network parameter, when trend changes, transfer ratio remains unchanged, and can obtain power flow transfer coefficient by electrical network simulation softward.
Step 2, calculate the trend value of rear second circuit of first line tripping operation, the instantaneous trend value of first line is A, and the instantaneous trend value of the second circuit is B, the trend value C=A*r+B of the second circuit after first line tripping operation;
Step 3, in monitoring system, after the tripping operation of monitoring first line, the change of the trend value C of the second circuit, controls the rated load trend that this value is less than the second circuit.The monitoring system adopted comprises display screen, and the change curve of trend value C of rear second circuit of display screen display first line tripping operation and the rated load trend index line of the second circuit, the peak value of change curve takes following steps close to during index line.
Step 4, after first line tripping operation during rated load trend close to the second circuit of the trend value C of the second circuit, reduces the trend value of first line or reduces the trend value of the second circuit, can reduce trend value C.
This stability limitation method for supervising improves original many grades of ladder combination of numbers limits, and changing ladder discrete type limit is the linear limit of intelligent visual.By use of the present invention, eliminate many grades of ladders, realize linear monitoring control, can the load of control circuit comparatively close to rated value, make full use of mains supply ability, economic and social benefit is remarkable.
Below in conjunction with matrix embodiment, technical scheme of the present invention is described in detail, but following embodiment is only the preferred embodiments of the present invention, and not all.Based on the embodiment in embodiment, those skilled in the art under the prerequisite not making creative work obtain other embodiment, all belong to protection scope of the present invention.
Be a certain application example in actual electric network below.Have first line section and the second line section in certain electrical network, after tripping for preventing first line, the second Line Flow exceedes its short-time overload capacity 330MW, formulates corresponding stability limitation.
The first step: calculate first line to the power flow transfer coefficient of the second circuit.Being calculated by electrical network simulation softward, can this transfer ratio be 0.32.
According to original limit method for supervising, be provided with first line trend value and the second Line Flow value, need to monitor first line section and the second line section simultaneously, namely when first line trend value is below 500MW, control the second Line Flow value at below 170MW; When first line trend value is more than 500MW below 600MW, control the second Line Flow value at below 130MW; When first line trend value is more than 600MW below 700MW, the second circuit load disturbance value is at below 100MW; Which is third gear stairstepping, very inconvenient during policer operation.Therefore make improvements, as next step.
Second step: provide limit monitoring arithmetic expression.First line and the actual trend value of the second circuit represent with A and B respectively, and transfer ratio r is 0.32, then limit monitoring arithmetic expression is C=A*0.32+B.
3rd step: in monitoring system, the trend value of the second circuit after the tripping operation of monitoring first line, also the C value in namely above-mentioned, and mark rated load trend index line with the rated load trend 330MW of the second circuit, by monitoring that whether C value is more than 330MW, intuitively can reflect whether first line and the second Line Flow transfinite.
When C value change curve exceedes rated load trend index line, reduce the trend value of first line or reduce the trend value of the second circuit.
By above-described embodiment, object of the present invention is reached by fully effective.The personage being familiar with this technology should be understood that and the present invention includes but the content described in not limitting detailed description of the invention above.Anyly do not depart from amendment of the present invention and all will comprise within the scope of the appended claims.
Claims (3)
1. a stability limitation method for supervising, is characterized in that comprising the following steps:
A. power flow transfer coefficient is calculated, electrical network comprises first line and the second circuit, the current trend value of first line is a, the current trend value of the second circuit is b, after first line tripping operation, the trend value of first line becomes 0, and now the trend value of the second circuit becomes b ', can obtain first line to the power flow transfer coefficient r=of the second circuit (b '-b)/a;
B. calculate the trend value of rear second circuit of first line tripping operation, the instantaneous trend value of first line is A, and the instantaneous trend value of the second circuit is B, the trend value C=A*r+B of the second circuit after first line tripping operation;
C., in monitoring system, after the tripping operation of monitoring first line, the change of the trend value C of the second circuit, controls the rated load trend that this value is less than the second circuit;
D., when the rated load trend of the trend value C of the second circuit after first line tripping operation close to the second circuit, reduce the trend value of first line or reduce the trend value of the second circuit.
2. a kind of stability limitation method for supervising according to claim 1, it is characterized in that: described monitoring system comprises display screen, the change curve of trend value C of rear second circuit of described display screen display first line tripping operation and the rated load trend index line of the second circuit, the peak value of change curve takes b step close to during rated load trend index line.
3. a kind of stability limitation method for supervising according to claim 1 and 2, is characterized in that: described power flow transfer coefficient is relevant to electrical network parameter, and when trend changes, transfer ratio remains unchanged.
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| CN201410013474.XA CN103779964B (en) | 2014-01-10 | 2014-01-10 | Stability limitation monitoring method |
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| CN201410013474.XA CN103779964B (en) | 2014-01-10 | 2014-01-10 | Stability limitation monitoring method |
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| CN103779964B true CN103779964B (en) | 2015-03-25 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201430470Y (en) * | 2009-06-29 | 2010-03-24 | 西安兴汇电力科技有限公司 | Non-outrage load transfer system of high-voltage network distribution circuit |
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| JP5645783B2 (en) * | 2011-09-16 | 2014-12-24 | 東京瓦斯株式会社 | Power system support system |
| CN102882207A (en) * | 2012-09-18 | 2013-01-16 | 安徽省电力公司 | Method for controlling scheduling tidal current limit of power grid |
| CN102946097B (en) * | 2012-10-22 | 2015-03-25 | 中国电力科学研究院 | Method for controlling thermal stability in real time by combining automatic gain control (AGC) system and manual scheduling |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201430470Y (en) * | 2009-06-29 | 2010-03-24 | 西安兴汇电力科技有限公司 | Non-outrage load transfer system of high-voltage network distribution circuit |
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Effective date of registration: 20150108 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: Huzhou Power Supply Company of State Grid Zhejiang Electric Power Company Applicant after: HUZHOU ELECTRIC POWER DESIGN INSTITUTE CO., LTD. Address before: 313000 Huzhou economic and Technological Development Zone, Zhejiang, Phoenix Road, No. 777, No. Applicant before: State Grid Corporation of China Applicant before: Huzhou Power Supply Company of State Grid Zhejiang Electric Power Company |
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