CN102025159A - Comprehensive evaluation method and system of stability of quiescent voltage - Google Patents

Comprehensive evaluation method and system of stability of quiescent voltage Download PDF

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CN102025159A
CN102025159A CN 201010599850 CN201010599850A CN102025159A CN 102025159 A CN102025159 A CN 102025159A CN 201010599850 CN201010599850 CN 201010599850 CN 201010599850 A CN201010599850 A CN 201010599850A CN 102025159 A CN102025159 A CN 102025159A
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power margin
power
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threshold value
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CN102025159B (en
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王波
赵全刚
张荣华
杜明田
曹原
张海成
李芳芳
李升�
赵文丽
张君
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Binzhou Power Supply Co of State Grid Shandong Electric Power Co Ltd
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • 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
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    • 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
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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Abstract

The invention discloses a comprehensive evaluation method and system of stability of quiescent voltage. The comprehensive evaluation method comprises the following steps: acquiring power grid model parameters and power real-time state information; carrying out quiescent voltage stability calculation on the power grid by using a continuous tidal current calculation method, wherein the continuous tidal current calculation method is as follows: calculating the power margin index of each load node, power margin index of each region and power margin index of overall power grid; and calculating comprehensive evaluation index of stability of voltage. In the comprehensive evaluation method of the stability of the quiescent voltage, the on-line monitoring operation of the stability of the voltage is realized through using a mode which is easy for a dispatcher to understand, thereby having significance of ensuring safe and stable operation of the power grid. The comprehensive evaluation method is simple and visual, is easy to realize and understand, and has better operability.

Description

A kind of static voltage stability integrated evaluating method and system
Technical field
The present invention relates to power system analysis and control field, specifically, relate to a kind of static voltage stability integrated evaluating method and system.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of static voltage stability integrated evaluating method and system, the voltage stable state of electric power system integral body is provided the scoring of an integral body.
The present invention adopts following technological means to realize goal of the invention:
A kind of static voltage stability integrated evaluating method is characterized in that, comprises the steps:
(1) obtains electric network model parameter and real-time power network state information;
(2) electrical network is carried out static voltage stability and calculate, adopt the continuous tide computational methods, comprise and calculate each load bus power margin index k respectively Load, each regional power margin index k AreaPower margin index k with the whole network Net
(3) calculating voltage is stablized comprehensive evaluation index:
(3.1) voltage is stablized the comprehensive evaluation index total points and is initialized as full marks S Fullmark
(3.2) power margin of load bus, regional power margin and the whole network power margin and predefined nargin threshold value index are made comparisons, as this mark, formula is as follows less than the power margin difference summation of threshold value:
Figure 201010599850X100002DEST_PATH_IMAGE002
Figure 201010599850X100002DEST_PATH_IMAGE004
Figure 201010599850X100002DEST_PATH_IMAGE006
In the formula, i represents the load bus number, and j represents number of regions,
Figure 201010599850X100002DEST_PATH_IMAGE008
,
Figure 201010599850X100002DEST_PATH_IMAGE010
,
Figure 201010599850X100002DEST_PATH_IMAGE012
Represent predefined load bus desire degree threshold value index, regional desire degree threshold value index, the whole network desire degree threshold value index respectively,
Figure 201010599850X100002DEST_PATH_IMAGE014
Represent the power desire degree of load bus i,
Figure 201010599850X100002DEST_PATH_IMAGE016
The power desire degree of zone j;
(3.3) stablize from voltage and deduct each mark the comprehensive evaluation index total points, specifically subtract the branch standard according to this predefined weight calculation:
Figure 201010599850X100002DEST_PATH_IMAGE018
In the formula,
Figure 201010599850X100002DEST_PATH_IMAGE020
Represent load bus predefine weight,
Figure 201010599850X100002DEST_PATH_IMAGE022
Represent regional predefine weight,
Figure 201010599850X100002DEST_PATH_IMAGE024
Represent the whole network predefine weight, last obatained score S TotalBe the comprehensive evaluation index of current system static voltage stability.
As the further qualification to the technical program, described electric network model parameter comprises series resistance, series reactance, shunt conductance, shunt susceptance, the no-load voltage ratio of transformer and the impedance of impedance, capacitor and reactor of transmission line.
As the further qualification to the technical program, described real-time power network state information comprises meritorious, idle and electric current, switch and the disconnecting link state of voltage, phase angle, line and the transformer of each node bus.
A kind of static voltage stability overall evaluation system is characterized in that, comprising:
Information acquisition module: obtain electric network model parameter and real-time power network state information;
Static voltage stability computing module: electrical network is carried out static voltage stability calculate, adopt the continuous tide computational methods, comprise and calculate each load bus power margin index k respectively Load, each regional power margin index k AreaPower margin index k with the whole network Net
Voltage is stablized the overall merit module: voltage is stablized the comprehensive evaluation index total points and is initialized as full marks S Fullmark;The power margin of load bus, regional power margin and the whole network power margin and predefined nargin threshold value index are made comparisons, and as this mark, formula is as follows less than the power margin difference summation of threshold value:
Figure 770474DEST_PATH_IMAGE002
Figure 749931DEST_PATH_IMAGE004
In the formula, i represents the load bus number, and j represents number of regions,
Figure 800244DEST_PATH_IMAGE008
,
Figure 424735DEST_PATH_IMAGE010
,
Figure 309515DEST_PATH_IMAGE012
Represent predefined load bus desire degree threshold value index, regional desire degree threshold value index, the whole network desire degree threshold value index respectively,
Figure 389597DEST_PATH_IMAGE014
Represent the power desire degree of load bus i,
Figure 650815DEST_PATH_IMAGE016
The power desire degree of zone j;
(3.3) stablize from voltage and deduct each mark the comprehensive evaluation index total points, specifically subtract the branch standard according to this predefined weight calculation:
Figure 132743DEST_PATH_IMAGE018
In the formula,
Figure 188423DEST_PATH_IMAGE020
Represent load bus predefine weight,
Figure 818119DEST_PATH_IMAGE022
Represent regional predefine weight, Represent the whole network predefine weight, last obatained score S TotalBe the comprehensive evaluation index of current system static voltage stability.
As the further qualification to the technical program, described electric network model parameter comprises series resistance, series reactance, shunt conductance, shunt susceptance, the no-load voltage ratio of transformer and the impedance of impedance, capacitor and reactor of transmission line.
As the further qualification to the technical program, described real-time power network state information comprises meritorious, idle and electric current, switch and the disconnecting link state of voltage, phase angle, line and the transformer of each node bus.
Compared with prior art, advantage of the present invention and good effect are: static voltage stability integrated evaluating method of the present invention, the mode that one dispatcher understands easily, realized the in-service monitoring operation that voltage is stable, significant to the safe and stable operation of guaranteeing electrical network, this method simple, intuitive is easy to realize and understand that better operability is arranged.
Description of drawings
Fig. 1 is the flow chart of the preferred embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment the present invention is done further to describe in detail.
Referring to Fig. 1, this preferred embodiment is an example with Binzhou Prefecture's electrical network,
Binzhou electrical network belongs to area power grid, and is larger, and structure is comparatively complicated, and power supply reliability is had relatively high expectations, and the static voltage stability of Home Network is badly in need of comprehensively understanding and grasping.
Electrical network construction characteristic and ruuning situation according to Binzhou electrical network, set comprehensive index full marks value is 100, set node power nargin threshold value, division power nargin threshold value and the whole network power margin threshold value according to current the whole network loading condition and be respectively 20,5 and 2, set weighted value and be respectively 0.4,0.3 and 0.3.
(1) obtains electric network model parameter and real-time power network state information from the energy management model;
(2) electrical network is carried out static voltage stability and calculate, adopt the continuous tide computational methods, comprise and calculate each load bus power margin index k respectively Load, each regional power margin index k AreaPower margin index k with the whole network Net
(3) calculating voltage is stablized comprehensive evaluation index:
(3.1) voltage is stablized the comprehensive evaluation index total points and is initialized as full marks S Fullmark
(3.2) power margin of load bus, regional power margin and the whole network power margin and predefined nargin threshold value index are made comparisons, as this mark, formula is as follows less than the power margin difference summation of threshold value:
Figure 286890DEST_PATH_IMAGE002
Figure 529784DEST_PATH_IMAGE004
Figure 833726DEST_PATH_IMAGE006
In the formula, i represents the load bus number, and j represents number of regions,
Figure 921899DEST_PATH_IMAGE008
,
Figure 627687DEST_PATH_IMAGE010
,
Figure 775902DEST_PATH_IMAGE012
Represent predefined load bus desire degree threshold value index, regional desire degree threshold value index, the whole network desire degree threshold value index respectively,
Figure 567141DEST_PATH_IMAGE014
Represent the power desire degree of load bus i,
Figure 456075DEST_PATH_IMAGE016
The power desire degree of zone j;
(3.3) stablize from voltage and deduct each mark the comprehensive evaluation index total points, specifically subtract the branch standard according to this predefined weight calculation:
Figure 16369DEST_PATH_IMAGE018
In the formula,
Figure 601066DEST_PATH_IMAGE020
Represent load bus predefine weight,
Figure 614021DEST_PATH_IMAGE022
Represent regional predefine weight,
Figure 371892DEST_PATH_IMAGE024
Represent the whole network predefine weight, last obatained score S TotalBe the comprehensive evaluation index of current system static voltage stability.
[0015]Described electric network model parameter comprises series resistance, series reactance, shunt conductance, shunt susceptance, the no-load voltage ratio of transformer and the impedance of impedance, capacitor and reactor of transmission line.
Described real-time power network state information comprises meritorious, idle and electric current, switch and the disconnecting link state of voltage, phase angle, line and the transformer of each node bus.
A kind of static voltage stability overall evaluation system comprises:
Information acquisition module: obtain electric network model parameter and real-time power network state information from the energy management model;
Static voltage stability computing module: electrical network is carried out static voltage stability calculate, adopt the continuous tide computational methods, comprise and calculate each load bus power margin index k respectively Load, each regional power margin index k AreaPower margin index k with the whole network Net
Voltage is stablized the overall merit module: voltage is stablized the comprehensive evaluation index total points and is initialized as full marks S Fullmark;The power margin of load bus, regional power margin and the whole network power margin and predefined nargin threshold value index are made comparisons, and as this mark, formula is as follows less than the power margin difference summation of threshold value:
Figure 537426DEST_PATH_IMAGE002
Figure 542291DEST_PATH_IMAGE004
Figure 790345DEST_PATH_IMAGE006
In the formula, i represents the load bus number, and j represents number of regions,
Figure 273279DEST_PATH_IMAGE008
, , Represent predefined load bus desire degree threshold value index, regional desire degree threshold value index, the whole network desire degree threshold value index respectively,
Figure 472944DEST_PATH_IMAGE014
Represent the power desire degree of load bus i,
Figure 759569DEST_PATH_IMAGE016
The power desire degree of zone j;
(3.3) stablize from voltage and deduct each mark the comprehensive evaluation index total points, specifically subtract the branch standard according to this predefined weight calculation:
Figure 696432DEST_PATH_IMAGE018
In the formula,
Figure 790903DEST_PATH_IMAGE020
Represent load bus predefine weight,
Figure 265746DEST_PATH_IMAGE022
Represent regional predefine weight,
Figure 106795DEST_PATH_IMAGE024
Represent the whole network predefine weight, last obatained score S TotalBe the comprehensive evaluation index of current system static voltage stability.
[0018]Described electric network model parameter comprises series resistance, series reactance, shunt conductance, shunt susceptance, the no-load voltage ratio of transformer and the impedance of impedance, capacitor and reactor of transmission line.
Described real-time power network state information comprises meritorious, idle and electric current, switch and the disconnecting link state of voltage, phase angle, line and the transformer of each node bus.
 
Calculating the stable comprehensive evaluation index value of voltage according to set code of points is 92 minutes.According to comprehensive evaluation index as can be known, the static electric voltage stability of Binzhou electrical network meets the demands, and the global voltage level of stability is better.

Claims (6)

1. a static voltage stability integrated evaluating method is characterized in that, comprises the steps:
Obtain electric network model parameter and real-time power network state information;
Electrical network is carried out static voltage stability calculate, adopt the continuous tide computational methods, comprise and calculate each load bus power margin index k respectively Load, each regional power margin index k AreaPower margin index k with the whole network Net
Calculating voltage is stablized comprehensive evaluation index:
(3.1) voltage is stablized the comprehensive evaluation index total points and is initialized as full marks S Fullmark
(3.2) power margin of load bus, regional power margin and the whole network power margin and predefined nargin threshold value index are made comparisons, as this mark, formula is as follows less than the power margin difference summation of threshold value:
Figure 630342DEST_PATH_IMAGE002
Figure 882332DEST_PATH_IMAGE004
In the formula, i represents the load bus number, and j represents number of regions,
Figure 201010599850X100001DEST_PATH_IMAGE007
, ,
Figure 201010599850X100001DEST_PATH_IMAGE009
Represent predefined load bus desire degree threshold value index, regional desire degree threshold value index, the whole network desire degree threshold value index respectively, Represent the power desire degree of load bus i,
Figure 201010599850X100001DEST_PATH_IMAGE011
The power desire degree of zone j;
(3.3) stablize from voltage and deduct each mark the comprehensive evaluation index total points, specifically subtract the branch standard according to this predefined weight calculation:
Figure 201010599850X100001DEST_PATH_IMAGE012
In the formula,
Figure 201010599850X100001DEST_PATH_IMAGE013
Represent load bus predefine weight,
Figure 201010599850X100001DEST_PATH_IMAGE014
Represent regional predefine weight,
Figure 201010599850X100001DEST_PATH_IMAGE015
Represent the whole network predefine weight, last obatained score S TotalBe the comprehensive evaluation index of current system static voltage stability.
2. according to the described static voltage stability integrated evaluating method of claim 1, it is characterized in that: described electric network model parameter comprises series resistance, series reactance, shunt conductance, shunt susceptance, the no-load voltage ratio of transformer and the impedance of impedance, capacitor and reactor of transmission line.
3. according to the described static voltage stability integrated evaluating method of claim 1, it is characterized in that described real-time power network state information comprises meritorious, idle and electric current, switch and the disconnecting link state of voltage, phase angle, line and the transformer of each node bus.
4. a static voltage stability overall evaluation system is characterized in that, comprising:
Information acquisition module: obtain electric network model parameter and real-time power network state information;
Static voltage stability computing module: electrical network is carried out static voltage stability calculate, adopt the continuous tide computational methods, comprise and calculate each load bus power margin index k respectively Load, each regional power margin index k AreaPower margin index k with the whole network Net
Voltage is stablized the overall merit module: voltage is stablized the comprehensive evaluation index total points and is initialized as full marks S Fullmark;The power margin of load bus, regional power margin and the whole network power margin and predefined nargin threshold value index are made comparisons, and as this mark, formula is as follows less than the power margin difference summation of threshold value:
Figure 844472DEST_PATH_IMAGE002
Figure 472899DEST_PATH_IMAGE004
Figure 584687DEST_PATH_IMAGE006
In the formula, i represents the load bus number, and j represents number of regions,
Figure 7578DEST_PATH_IMAGE007
,
Figure 207746DEST_PATH_IMAGE008
,
Figure 639865DEST_PATH_IMAGE009
Represent predefined load bus desire degree threshold value index, regional desire degree threshold value index, the whole network desire degree threshold value index respectively,
Figure 343510DEST_PATH_IMAGE010
Represent the power desire degree of load bus i,
Figure 202881DEST_PATH_IMAGE011
The power desire degree of zone j;
Stablize from voltage and to deduct each mark the comprehensive evaluation index total points, specifically subtract the branch standard according to this predefined weight calculation:
Figure 624766DEST_PATH_IMAGE012
In the formula,
Figure 670695DEST_PATH_IMAGE013
Represent load bus predefine weight, Represent regional predefine weight,
Figure 524699DEST_PATH_IMAGE015
Represent the whole network predefine weight, last obatained score S TotalBe the comprehensive evaluation index of current system static voltage stability.
5. according to the described static voltage stability overall evaluation system of claim 4, it is characterized in that described electric network model parameter comprises series resistance, series reactance, shunt conductance, shunt susceptance, the no-load voltage ratio of transformer and the impedance of impedance, capacitor and reactor of transmission line.
6. according to the described static voltage stability overall evaluation system of claim 4, it is characterized in that described real-time power network state information comprises meritorious, idle and electric current, switch and the disconnecting link state of voltage, phase angle, line and the transformer of each node bus.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102163846A (en) * 2011-05-24 2011-08-24 清华大学 Regional power grid network reconstruction method taking loss reduction and load balancing as targets
CN103413031A (en) * 2013-07-25 2013-11-27 国家电网公司 Continuous power flow computation method based on line voltage stabilization index
CN105137244A (en) * 2015-09-10 2015-12-09 南方电网科学研究院有限责任公司 Method and system for realizing stabilized monitoring of static voltage in electric power system
CN106887848A (en) * 2015-12-16 2017-06-23 南京南瑞继保电气有限公司 Voltage power-less real-time control method based on Fuzzy Pattern Recognition

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CN101359026A (en) * 2008-09-17 2009-02-04 中国电力科学研究院 Full-time-domain voltage stability synthesis assessment method

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CN101359026A (en) * 2008-09-17 2009-02-04 中国电力科学研究院 Full-time-domain voltage stability synthesis assessment method

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《Intelligent Computation Technology and Automation,2008 International Conference On》 20081231 Yingni Mao,Maojun Li Optimal Reactive Power Planning Based on Simulated Annealing Particle Swarm Algorithm Considering Static Voltage Stability 106-110 1-6 , *
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102163846A (en) * 2011-05-24 2011-08-24 清华大学 Regional power grid network reconstruction method taking loss reduction and load balancing as targets
CN103413031A (en) * 2013-07-25 2013-11-27 国家电网公司 Continuous power flow computation method based on line voltage stabilization index
CN103413031B (en) * 2013-07-25 2016-03-23 国家电网公司 A kind of continuous tide computational methods based on branch-based voltage stability index
CN105137244A (en) * 2015-09-10 2015-12-09 南方电网科学研究院有限责任公司 Method and system for realizing stabilized monitoring of static voltage in electric power system
CN105137244B (en) * 2015-09-10 2018-06-19 南方电网科学研究院有限责任公司 It is used to implement the method and system that static voltage stability monitors in electric system
CN106887848A (en) * 2015-12-16 2017-06-23 南京南瑞继保电气有限公司 Voltage power-less real-time control method based on Fuzzy Pattern Recognition
CN106887848B (en) * 2015-12-16 2019-07-19 南京南瑞继保电气有限公司 Voltage power-less real-time control method based on Fuzzy Pattern Recognition

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