CN108599184A - A kind of offline selection method in effective reactive-load compensation place of electric system - Google Patents
A kind of offline selection method in effective reactive-load compensation place of electric system Download PDFInfo
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- CN108599184A CN108599184A CN201810466394.8A CN201810466394A CN108599184A CN 108599184 A CN108599184 A CN 108599184A CN 201810466394 A CN201810466394 A CN 201810466394A CN 108599184 A CN108599184 A CN 108599184A
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The present invention relates to a kind of offline selection methods in effective reactive-load compensation place of electric system.According to real-time electric power network structure and trend, the reactive-load compensation place sequence of system is obtained, specifically：First, a voltage hazard node is given, and by multiport Thevenin's equivalence that local system is equivalent at bi-nodal system；Then, correlation metric of each candidate compensation buses to spread of voltage place is calculated；And, calculating is normalized in obtained correlation metric again；Finally, a threshold value K is set, weeds out the node that correlation metric is less than K, obtains the set in effective reactive-load compensation place.The present invention can accurately screen effective candidate compensation buses, quickly improve the voltage stability of system.
Description
Technical field
The invention belongs to technical field of power systems, are related to a kind of offline choosing in effective reactive-load compensation place of electric system
A kind of selection method, and in particular to offline choosing in effective reactive-load compensation place of the electric system based on network structure and voltage magnitude
Selection method.
Background technology
In current power system, Transient Voltage Stability index or sensitivity analysis is mainly taken to be used as with reference to according to right
The control of reactive power compensating place is assessed, and more complicated algorithm, larger calculation amount is generally required during this, to all kinds of
Technology has higher requirement.Therefore, it is necessary to design a kind of convenient and simple idle control place selection mode, to improve electric power
The efficiency of System Reactive Power control, this is of great significance the analysis and solution formulation of electric system.
The present invention surveys network impedance information using principle equivalent multiport Dai Weinan, according to wide area dynamic information system
And voltage magnitude, calculate the index M in the unstable place of reflecting voltage and candidate compensation buses close relation degreej, by phase
The normalization of closing property index calculates and screening, obtains effective candidate compensation buses offline.
Invention content
The purpose of the present invention is to provide a kind of offline selection methods in effective reactive-load compensation place of electric system, it is only necessary to
Know the impedance information of partial electric grid and the information of voltage that the control of each candidate compensation buses is front and back, effective idle benefit can be obtained
Repay the selection method in place.
To achieve the above object, the technical scheme is that：A kind of effective reactive-load compensation place of electric system from
Line selection selection method, the voltage magnitude before and after network impedance information and control is surveyed according to wide area dynamic information system, and selection is effective
Reactive-load compensation place, specific implementation steps are as follows：
Step S01, assume that node i is voltage hazard node, it is by multiport Thevenin's equivalence, multinode power grid is equivalent
At two impedance of node i, two node power grid；The unstable place i of reflecting voltage is calculated with the correlation between candidate compensation buses j to refer to
Mark 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 before node j controls, Vj' for the voltage magnitude after node j control；
Step S02, on the basis of the maximum value of all correlation of nodes indexs, all obtained correlation metrics are carried out
Normalization calculates：
Wherein：MaFor the correlation metric of node a；KaFor the correlation metric after the normalization of node a；MmaxFor all sections
The maximum value of point correlation metric；
Step S03, the adjustability of candidate compensation buses j is calculated：
Wherein：ηjFor the regulating power of candidate compensation buses j；QjReactive power is adjusted for the residue of node j；QmaxFor section
Reactive power is adjusted in the maximum of point j.
Step S04, threshold value K and η are set, K is weeded outa＜ K or ηjThe candidate compensation buses of ＜ η obtain effective idle
Compensate node set.
Compared to the prior art, the invention has the advantages that：Present invention only requires the impedances for knowing partial electric grid
Information of voltage before and after information and the control of each candidate compensation buses, can obtain the selection method in effective reactive-load compensation place；Phase
Than in existing method, can accurately screen effective candidate compensation buses, the voltage stability of system is quickly improved.
Description of the drawings
Fig. 1 is sample calculation IEEE14 node diagrams.
Fig. 2 is two impedance of node i, two node power grid.
Fig. 3 is the selection method flow chart in effective reactive-load compensation place.
Specific implementation mode
Below in conjunction with the accompanying drawings, technical scheme of the present invention is specifically described.
As shown in figure 3, a kind of offline selection method in effective reactive-load compensation place of electric system of the present invention, according to wide
Voltage magnitude before and after domain dynamic information system actual measurement network impedance information and control, selects effective reactive-load compensation place, has
Body realizes that steps are as follows：
Step S01, assume that node i is voltage hazard node, it is by multiport Thevenin's equivalence, multinode power grid is equivalent
At two impedance of node i, two node power grid；The unstable place i of reflecting voltage is calculated with the correlation between candidate compensation buses j to refer to
Mark 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 before node j controls, Vj' for the voltage magnitude after node j control；
Step S02, on the basis of the maximum value of all correlation of nodes indexs, all obtained correlation metrics are carried out
Normalization calculates：
Wherein：MaFor the correlation metric of node a；KaFor the correlation metric after the normalization of node a；MmaxFor all sections
The maximum value of point correlation metric；
Step S03, the adjustability of candidate compensation buses j is calculated：
Wherein：ηjFor the regulating power of candidate compensation buses j；QjReactive power is adjusted for the residue of node j；QmaxFor section
Reactive power is adjusted in the maximum of point j.
Step S04, threshold value K and η are set, K is weeded outa＜ K or ηjThe candidate compensation buses of ＜ η obtain effective idle
Compensate node set.
It is specific embodiments of the present invention below.
The calculated examples selection IEEE14 node systems (as shown in Figure 1) of the method for the present invention.Certain moment, in node 13 and section
Break between point 14, node 14 becomes 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. 2.
Second step：Calculate the index Mi of reflecting voltage risk symptoms node and reactive-load compensation place substantial connection, result such as table 1
It is shown.
M index of the 1 each candidate compensation buses of table to node 14
Third walks：Obtained index is normalized, the results are shown in Table 2
Normalization index of the 2 each candidate compensation buses of table to node 14
4th step：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 above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made
When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.
Claims (1)
1. a kind of offline selection method in effective reactive-load compensation place of electric system, which is characterized in that believed according to wide area dynamic
Breath system surveys the voltage magnitude before and after network impedance information and control, selects effective reactive-load compensation place, specific implementation step
It is rapid as follows：
Step S01, assume 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 the correlation metric M between the unstable place i and candidate compensation buses j of reflecting voltagej；
Wherein：For the conjugation of node i network impedance inverse；For the conjugation of the mutual impedance of node j and node i；VjFor
Voltage magnitude before node j controls, Vj' for the voltage magnitude after node j control；
Step S02, on the basis of the maximum value of all correlation of nodes indexs, normalizing is carried out to all obtained correlation metrics
Change and calculates：
Wherein：MaFor the correlation metric of node a；KaFor the correlation metric after the normalization of node a；MmaxFor all node phases
The maximum value of closing property index；
Step S03, the adjustability of candidate compensation buses j is calculated：
Wherein：ηjFor the regulating power of candidate compensation buses j；QjReactive power is adjusted for the residue of node j；QmaxFor node j
Maximum be adjusted reactive power.
Step S04, threshold value K and η are set, K is weeded outa＜ K or ηjThe candidate compensation buses of ＜ η obtain effective reactive-load compensation
Node set.
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| CN201810466394.8A CN108599184B (en) | 2018-05-16 | 2018-05-16 | Offline selection method for effective reactive power compensation place of power system |
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| CN201810466394.8A CN108599184B (en) | 2018-05-16 | 2018-05-16 | Offline selection method for effective reactive power compensation place of power system |
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| CN108599184A true CN108599184A (en) | 2018-09-28 |
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Citations (4)
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|---|---|---|---|---|
| CN103199549A (en) * | 2013-04-10 | 2013-07-10 | 湖南大学 | Receiving-end power grid dynamic reactive power compensation equipment configuration position selecting method |
| CN104617585A (en) * | 2015-02-13 | 2015-05-13 | 东南大学 | Reactive compensation configuration method |
| CN106026118A (en) * | 2016-05-26 | 2016-10-12 | 国家电网公司 | Power grid dynamic reactive compensation node selection method based on node voltage recovery indexes |
| CN107658881A (en) * | 2017-09-27 | 2018-02-02 | 国网上海市电力公司 | Voltage stability critical point determination methods based on Thevenin's equivalence method |
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2018
- 2018-05-16 CN CN201810466394.8A patent/CN108599184B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199549A (en) * | 2013-04-10 | 2013-07-10 | 湖南大学 | Receiving-end power grid dynamic reactive power compensation equipment configuration position selecting method |
| CN104617585A (en) * | 2015-02-13 | 2015-05-13 | 东南大学 | Reactive compensation configuration method |
| CN106026118A (en) * | 2016-05-26 | 2016-10-12 | 国家电网公司 | Power grid dynamic reactive compensation node selection method based on node voltage recovery indexes |
| CN107658881A (en) * | 2017-09-27 | 2018-02-02 | 国网上海市电力公司 | Voltage stability critical point determination methods based on Thevenin's equivalence method |
Non-Patent Citations (1)
| Title |
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| FUYUAN HUANG: "A grid-side reactive power control strategy for highly offshore wind power penetrated systems", 《JOURNAL OF RENEWABLE AND SUSTAINABLE ENERGY》 * |
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