CN108599176A - A kind of effective offline selection method in cutting load place improving voltage stability - Google Patents
A kind of effective offline selection method in cutting load place improving voltage stability Download PDFInfo
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- CN108599176A CN108599176A CN201810466487.0A CN201810466487A CN108599176A CN 108599176 A CN108599176 A CN 108599176A CN 201810466487 A CN201810466487 A CN 201810466487A CN 108599176 A CN108599176 A CN 108599176A
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- node
- cutting load
- voltage
- load place
- place
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- 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
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Catching Or Destruction (AREA)
Abstract
The present invention provide it is a kind of improve voltage stability effective offline selection method in cutting load place select effective cutting load place according to the voltage magnitude of node before and after real-time electric power network structure and trend and cutting load, include the following steps：A complicated multinode local system is given, it is by multiport Thevenin's equivalence that local system is equivalent at bi-nodal system, each node is calculated to spread of voltage nodeMIndex；One threshold value is setK, weed out index and be less thanKNode, obtaining effective cutting load place, present invention only requires the information of voltage before and after the impedance information for knowing partial electric grid and cutting load, can select effective cutting load place.Compared to existing method, the case where more capable of accurately selecting the effective cutting load place of voltage stability to controlling voltage hazard node, system disturbance can be well adapted to.
Description
Technical field
The invention belongs to technical field of power systems, and in particular to a kind of effective cutting load place for improving voltage stability
Offline selection method.
Background technology
In current power system, Transient Voltage Stability index or voltage deviation is mainly taken to be used as with reference to according to right
Cutting load place with selection is assessed, and more complicated algorithm, larger calculation amount is generally required during this, to each
Class technology has higher requirement.Therefore, it is necessary to design a kind of convenient and simple cutting load place selection mode, to improve electric power
The efficiency of the online cutting load of system, this is of great significance the analysis and solution formulation of electric system.
Invention content
The object of the present invention is to provide a kind of selection methods in relatively effective cutting load place, utilize multiport Dai Weinan
Equivalent principle, according to wide area dynamic information system survey network impedance information, calculate the unstable place of reflecting voltage with it is to be selected
Select the index M of cutting load node contacts level of intimatei, by MiScreening, obtain effective cutting load place.
To achieve the above object, the present invention uses following technical scheme：A kind of effective cutting load improving voltage stability
The offline selection method in place surveys network impedance information according to wide area dynamic information system, selects suitable cutting load place,
Specifically include following steps：Step S1：Assuming that node i is voltage hazard node, by multiport Thevenin's equivalence, by multinode
Power grid is equivalent at two impedance of node i, two node power grid；Calculate correlation metric of each node to spread of voltage node；Step
S2：One threshold value K is set, weeds out the node that index is less than K, obtains effective cutting load place.
In an embodiment of the present invention, in step S1 between the unstable place i and cutting load node j of calculating reflecting voltage
Correlation metric Mj；
Wherein：For the conjugation of node i network impedance inverse；For the conjugation of the mutual impedance of node j and node i；
VjFor the voltage magnitude of node j, Vj' the voltage magnitude for being node j.
In an embodiment of the present invention, 0.2 K.
Compared with prior art, present invention only requires the voltage letters before and after the impedance information for knowing partial electric grid and cutting load
Breath, can select effective cutting load place.Compared to existing method, more can accurately select to control voltage hazard node
The effective cutting load place of voltage stability, the case where system disturbance can be well adapted to.
Description of the drawings
Fig. 1 is the flow chart of effective cutting load place selection.
Fig. 2 is sample calculation IEEE14 node diagrams.
Fig. 3 is two impedance of node i, two node power grid.
Specific implementation mode
Explanation is further explained to the present invention in the following with reference to the drawings and specific embodiments.
A kind of effective offline selection method in cutting load place improving voltage stability, according to wide area dynamic information system
Network impedance information is surveyed, suitable cutting load place is selected, specifically includes following steps：Step S1：Assuming that node i is voltage
Risk symptoms node, it is by multiport Thevenin's equivalence, multinode power grid is equivalent at two impedance of node i, two node power grid；It calculates each
Correlation metric of the node to spread of voltage node；Step S2：One threshold value K is set, the section that index is less than K is weeded out
Point obtains effective cutting load place.The main flow schematic diagram of the present invention is referring to Fig. 1.
In an embodiment of the present invention, in step S1 between the unstable place i and cutting load node j of calculating reflecting voltage
Correlation metric Mj；
Wherein：For the conjugation of node i network impedance inverse；For the conjugation of the mutual impedance of node j and node i；
VjFor the voltage magnitude of node j, Vj' the voltage magnitude for being node j.
Calculated examples select IEEE14 node systems (as shown in Figure 2).Certain moment occurs disconnected between node 13 and node 14
Line, node 14 become voltage hazard node.
The first step：By Thevenin's equivalence, complex electric network is equivalent at two impedance of node i, two node power grid, and result is such as
Shown in Fig. 3.
Second step：Calculate the index Mi of reflecting voltage risk symptoms node and cutting load place substantial connection, result such as 1 institute of table
Show.
M index of the 1 each cutting load node of table to node 14
Third walks：One threshold value K=0.2 is set, weeds out the node that index is less than K, obtains effective reactive-load compensation
Node, node 14, node 9, node 10.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification should all belong to the covering scope of the present invention.
Claims (3)
1. a kind of effective offline selection method in cutting load place improving voltage stability, it is characterised in that：According to wide area dynamic
Information system surveys network impedance information, selects suitable cutting load place, specifically includes following steps：
Step S1：Assuming that node i is voltage hazard node, by multiport Thevenin's equivalence, by the equivalent Cheng Jie of multinode power grid
Two impedances of point i, two node power grid；Calculate correlation metric of each node to spread of voltage node；
Step S2：One threshold value K is set, weeds out the node that index is less than K, obtains effective cutting load place.
2. the electric system cutting load place selection method according to claim 1 based on network structure and voltage magnitude,
It is characterized in that：The correlation metric M between the unstable place i and cutting load node j of reflecting voltage is calculated in step S1j；
Wherein：For the conjugation of node i network impedance inverse；For the conjugation of the mutual impedance of node j and node i；VjFor
The voltage magnitude of node j, Vj' the voltage magnitude for being node j.
3. the electric system cutting load place selection method according to claim 1 based on network structure and voltage magnitude,
It is characterized in that：K is 0.2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810466487.0A CN108599176A (en) | 2018-05-16 | 2018-05-16 | A kind of effective offline selection method in cutting load place improving voltage stability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810466487.0A CN108599176A (en) | 2018-05-16 | 2018-05-16 | A kind of effective offline selection method in cutting load place improving voltage stability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108599176A true CN108599176A (en) | 2018-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810466487.0A Pending CN108599176A (en) | 2018-05-16 | 2018-05-16 | A kind of effective offline selection method in cutting load place improving voltage stability |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102055191A (en) * | 2010-12-31 | 2011-05-11 | 重庆大学 | Wide area load shedding control method for quiescent voltage stabilization considering external power grid equivalence |
| US9866029B2 (en) * | 2014-11-04 | 2018-01-09 | Nec Corporation | Enhancing power system voltage stability using grid energy storage for voltage support |
-
2018
- 2018-05-16 CN CN201810466487.0A patent/CN108599176A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102055191A (en) * | 2010-12-31 | 2011-05-11 | 重庆大学 | Wide area load shedding control method for quiescent voltage stabilization considering external power grid equivalence |
| US9866029B2 (en) * | 2014-11-04 | 2018-01-09 | Nec Corporation | Enhancing power system voltage stability using grid energy storage for voltage support |
Non-Patent Citations (3)
| Title |
|---|
| 李鹏: "一种防止电压失稳的切负荷控制方法", 《电网技术》 * |
| 杜洪艳: "《复变函数与积分变换》", 31 January 2012, 华中师范大学出版社 * |
| 杨欢欢: "直流系统无功动态特征及其对受端电网暂态电压稳定的影响", 《电力自动化设备》 * |
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Application publication date: 20180928 |