CN104810834A - Voltage-sensitivity-based multi-section 500 kV grid reactive compensation switching strategy optimizing method - Google Patents
Voltage-sensitivity-based multi-section 500 kV grid reactive compensation switching strategy optimizing method Download PDFInfo
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Abstract
The invention discloses a voltage-sensitivity-based multi-section 500 kV grid reactive compensation switching strategy optimizing method. The voltage-sensitivity-based multi-section 500 kV grid reactive compensation switching strategy optimizing method comprises the following steps of inputting the grid structure data of a 500 kV grid and the configuration status of a reactive compensation device; based on a voltage sensitivity analysis method, analyzing transformer stations with the voltage over-limit problem under a multi-section situation, establishing a switching sequence list of the active compensation devices of the low-voltage sides of all the 500 kV transformer stations according to the sensitivity of every transformer station to voltage; according to the switching sequence list, switching practical grid reactive compensation devices until the busbar voltages of all the 500 kV transformer stations meet the requirements on the upper limit and the lower limit of operating voltage; obtaining an optimal switching strategy and switching records. According to the voltage-sensitivity-based multi-section 500 kV grid reactive compensation switching strategy optimizing method, the optimized switching strategy can ensure reasonable operation of 500 kV busbar voltage under the condition of continuous multiple sections, and meanwhile, reduce the number of times of switching of the reactive devices, so that the 500 kV transformer stations can meet the requirements on the upper limit and the lower limit of the busbar voltage.
Description
Technical field
The present invention relates to a kind of multibreak 500kV electric network reactive compensation Switching Strategy optimization method based on voltage sensibility, belong to electric network reactive-load voltage optimization technical field.
Background technology
The optimization switching of reactive compensator of electrical network is an important content in operation of power networks, based on existing reactive power compensator configuration and grid structure, in known optimization cycle each node load power of system prerequisite under, the best Switching Strategy of optimizing application technology determination Reactive Power Device, plays the effect reducing via net loss, elimination overload and improve voltage's distribiuting.
Study Reactive Power Device optimize switching problem time mainly contain towards time discontinuity surface static optimization and consider switching frequency restriction overall dynamic optimization two class methods.Static optimization is minimum for target with the system losses optimizing the moment, and considers various operation constraints.The variable of static optimization is only the input group number optimizing moment each Reactive Power Device, less being easy to of the scale of solution space obtains optimization solution at short notice, and both can carry out offline optimization according to the predicted load of following a day, the online load data of system also can be adopted to carry out real-time optimization.But the static optimization method of routine exists distinct issues: Optimized model is only minimum for target with the system losses in each moment, be difficult to consider switching frequency restriction, prioritization scheme does not often possess actual operability.Dynamic optimization, based on the load prediction data of following a day, was divided into some periods by one day, minimum for target with the network loss sum of whole day day part, and limited switching frequency as an important constraints.The control variables of dynamic optimization model comprises the input group number of each node Reactive Power Device of whole day day part, and the dimension of control variables sharply expands, and solution space scale and amount of calculation are all much bigger than static optimization, and its Optimization Solution is very difficult.
In 500kV electrical network actual motion, the switching of substation low-voltage side reactive power compensator is determined according to the change in voltage situation of single substation bus bar by monitor staff usually, there is the shortcomings such as switching frequency is many, voltage regulation result is poor, shortage global optimization.
Summary of the invention
For the deficiency that prior art exists, the object of the invention is to provide a kind of multibreak 500kV electric network reactive compensation Switching Strategy optimization method based on voltage sensibility, the switching sequence list that the present invention is based on voltage sensibility foundation is optimized switching to reactive power compensator, while when ensureing selected, in discontinuity surface, reactive power compensator adds up switching least number of times, and 500kV substation bus bar voltage meets bound requirement.
To achieve these goals, the present invention realizes by the following technical solutions:
Multibreak the 500kV electric network reactive compensation Switching Strategy optimization method based on voltage sensibility of the present invention, comprises following step:
(1) 500kV grid nodes, circuit, transformer, load data and reactive power compensator quantity and capacity is inputted, the node voltage of electrical network and the Switching Strategy of line power and reactive power compensator under the continuous operating time section quantity of input needs optimization, each section, Switching Strategy comprises optimum Switching Strategy, recently Switching Strategy and up-to-date Switching Strategy;
(2) based on voltage sensibility analytical method, the transformer station that there is voltage out-of-limit problem in multibreak situation is analyzed, the transformer station of voltage out-of-limit is there is under determining discontinuity surface of many times, calculate 500kV reactive compensator of electrical network to the voltage sensibility of voltage out-of-limit transformer station, set up the switching priority sequence table of all 500kV substation low-voltage side reactive power compensators according to sensitivity height;
(3) according to switching sequence list, switching is carried out to actual electric network reactive power compensator, until the busbar voltage of all 500kV transformer stations meets the requirement of working voltage bound;
(4) the optimum Switching Strategy of 500kV reactive compensator of electrical network in multibreak situation and switching record is finally obtained.
Step (2)-(4) specifically comprise following step:
To the continuous operating time section quantity optimized be needed to be set to T, optimum Switching Strategy be set to STR
0, recently Switching Strategy be set to STR
1sTR is set to up-to-date Switching Strategy
2, switching record is set to ACT, wherein: STR
0, STR
1and STR
2comprise the switching state of all 500kV Reactive Power Compensation Eqyuipment in Substations, described switching state comprises number of units and capacity; ACT records time of the reactive power compensator switching of each transformer station, number of units and capacity, and the state of the 500kV reactive power compensator under discontinuity surface time first is set to up-to-date Switching Strategy STR
2; t
e=0 (t
ediscontinuity surface when representing the 0th);
Step0: arrange t=1, discontinuity surface when representing first, by STR
2be updated to STR
0and STR
1, ACT empties;
Step1: by STR
2the operation of power networks data substituted under t section carry out Load flow calculation (computational methods are prior art, repeat no more) herein, and all 500kV transformer stations that there is the out-of-limit situation of busbar voltage are designated as S set TA
o; As STA
ofor sky, show to there is not out-of-limit situation, turn step2; If STA
obe not empty, show to there is voltage out-of-limit situation, turn step3;
Step2:t=t+1, if t > is T, turns step7; Otherwise, turn step1;
Step3: calculate 500kV reactive compensator of electrical network to STA
oin the voltage sensibility of all transformer stations, the preferential switching sequence list of reactive power compensator is set up according to voltage sensibility size, reactive power compensator is dropped into successively according to switching sequence list, and carry out Load flow calculation, until the 500kV substation bus bar voltage under t section meets bound requirement, and switching operation is updated to STR
2if, t
e=t, turns step4;
Step4:t
e=t
e-1, as t
e=0, turn step0; Otherwise, turn step5;
Step5: by STR
2substitute into t
eoperation of power networks data under section carry out Load flow calculation, judge whether to there is the out-of-limit situation of 500kV transformer substation voltage, as existed, turn step6; If do not existed, turn step4;
Step6: compare STR
1and STR
2, by different Reactive Power Device switching state updating to ACT, turn step2;
Step7: export optimum Switching Strategy STR
0and ACT, terminate to calculate.
In described step (3), according to switching sequence list, switching is carried out to actual electric network reactive power compensator, and by electric power system specialty analysis software BPA, simulation analysis calculating is carried out to multiple electrical network profile data, whether checking there is the out-of-limit of 500kV substation bus bar voltage, meets service requirement.
While Switching Strategy after optimization of the present invention ensures that 500kV busbar voltage is rationally run in continuous multiple section situation, decrease the switching frequency of Reactive Power Device, 500kV substation bus bar voltage meets bound requirement, extend the useful life of reactive power compensator, play the effect reducing via net loss, elimination overload and improve voltage's distribiuting, improve economy and the stability of operation of power networks.
Accompanying drawing explanation
Fig. 1 is multibreak the 500kV electric network reactive compensation Switching Strategy optimization method workflow diagram based on voltage sensibility of the present invention.
Embodiment
The technological means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.
The present invention is a kind of multibreak 500kV electric network reactive compensation Switching Strategy optimization method based on voltage sensibility, it is the voltage out-of-limit problem that in employing voltage sensibility ANALYSIS OF CALCULATING multibreak situation, transformer station exists, thus decide its switching priority according to the height of each Reactive Power Compensation Eqyuipment in Substation to busbar voltage sensitivity, obtain the Switching Strategy after the optimization of 500kV electric network reactive compensation, the economical operation of decrease switching frequency, improve voltage regulation result, achieve global optimization and electrical network.Its concrete steps are as follows:
(1) 500kV Net Frame of Electric Network data and reactive power compensator configuring condition is determined, and continuous operating time section quantity, profile data and Switching Strategy to be optimized.
(2) adopt voltage sensibility analytic approach to analyze the transformer station that there is voltage out-of-limit problem in multibreak situation, set up the switching sequence list of the whole network reactive power compensator;
Computational methods detailed process based on voltage sensibility is as follows:
To the continuous operating time section quantity optimized be needed to be set to T, correlated variables comprises optimum Switching Strategy STR
0, nearest Switching Strategy STR
1with up-to-date Switching Strategy STR
2, switching operation ACT, wherein: STR
0, STR
1and STR
2comprise the switching state (number of units and capacity) of all 500kV Reactive Power Compensation Eqyuipment in Substations; ACT records time of the reactive power compensator switching of each transformer station, number of units and capacity.
Step0: discontinuity surface t=1 when remembering first, is updated to STR by the Switching Strategy of reactive power compensator under the t period
0, STR
1and STR
2, ACT=φ, t
e=0;
Step1: by STR
2the operation of power networks data substituted under t section carry out Load flow calculation, and all 500kV transformer stations that there is the out-of-limit situation of busbar voltage are designated as S set TA
o; As STA
o=φ, turns step2; Otherwise, turn step3;
Step2:t=t+1, if t > is T, turns step7; Otherwise, turn step1;
Step3: calculate all reactive power compensators to STA
oin the voltage sensibility of all transformer stations, according to STR
2sTA is formed with the capacity of Reactive Power Device
omiddle transformer station Reactive Power Device switching priority sequence table, carries out the switching operation of Reactive Power Device, ensures to meet voltage bound requirement under t section, and Switching Strategy is updated to STR based on switching sequence list and voltage out-of-limit value
2if, t
e=t turns step4;
Step4:t
e=t
e-1, as t
e=0, turn step5; Otherwise, turn step6;
Step5:STR
0=STR
1=STR
2, turn step2:;
Step6: by STR
2substitute into t
eunder section, operation of power networks data carry out Load flow calculation, as there is the 500kV transformer station of voltage out-of-limit, and contrast STR
2and STR
1the difference of middle Reactive Power Device switching state, and by the switching time t of relevant Reactive Power Device
eaCT is added into, STR with switching capacity
1=STR
2, turn step2:;
Step7: export optimum Switching Strategy STR
0and ACT, terminate to calculate.
By above Algorithm Analysis, the Reactive Power Compensation Eqyuipment in Substation Switching Strategy that there is voltage out-of-limit problem obtains optimization, thus can set up the switching sequence list of all 500kV substation low-voltage side Reactive Power Devices according to the sensitivity height of each transformer station to voltage;
(3) table is selected the switching of Reactive Power Device and is ensured that whole 500kV substation bus bar voltage meets bound requirement in order;
(4) the optimum Switching Strategy of 500kV reactive compensator of electrical network and switching record is obtained; While Switching Strategy after optimization ensures that 500kV busbar voltage is rationally run in continuous multiple section situation, decrease the switching frequency of Reactive Power Device, extend the useful life of reactive power compensator, play the effect reducing via net loss, elimination overload and improve voltage's distribiuting, improve the economy of operation of power networks.
Consider the deficiency of existing Jiangsu Power Grid 500kV Reactive Power Compensation Eqyuipment in Substation Switching Strategy, above-mentioned optimization method is adopted to be optimized, compared with conventional Switching Strategy, while Switching Strategy after optimization ensures that 500kV busbar voltage is rationally run in continuous multiple section situation, reduce the equipment loss that cost of labor in operation of power networks and Reactive Power Device frequent switching cause, and economic benefit has long-lasting.
More than show and describe general principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection range is defined by appending claims and equivalent thereof.
Claims (3)
1., based on multibreak 500kV electric network reactive compensation Switching Strategy optimization method of voltage sensibility, it is characterized in that, comprise following step:
(1) 500kV grid nodes, circuit, transformer, load data and reactive power compensator quantity and capacity is inputted, the node voltage of electrical network and the Switching Strategy of line power and reactive power compensator under the continuous operating time section quantity of input needs optimization, each section, described Switching Strategy comprises optimum Switching Strategy, recently Switching Strategy and up-to-date Switching Strategy;
(2) based on voltage sensibility analytical method, the transformer station that there is voltage out-of-limit problem in multibreak situation is analyzed, the transformer station of voltage out-of-limit is there is under determining discontinuity surface of many times, calculate 500kV reactive compensator of electrical network to the voltage sensibility of voltage out-of-limit transformer station, set up the switching priority sequence table of all 500kV substation low-voltage side reactive power compensators according to sensitivity height;
(3) according to switching sequence list, switching is carried out to actual electric network reactive power compensator, until the busbar voltage of all 500kV transformer stations meets the requirement of working voltage bound;
(4) the optimum Switching Strategy of 500kV reactive compensator of electrical network in multibreak situation and switching record is finally obtained.
2. multibreak the 500kV electric network reactive compensation Switching Strategy optimization method based on voltage sensibility according to claim 1, it is characterized in that, step (2)-(4) specifically comprise following step:
To the continuous operating time section quantity optimized be needed to be set to T, optimum Switching Strategy be set to STR
0, recently Switching Strategy be set to STR
1sTR is set to up-to-date Switching Strategy
2, switching record is set to ACT, wherein: STR
0, STR
1and STR
2comprise the switching state of all 500kV Reactive Power Compensation Eqyuipment in Substations, described switching state comprises number of units and capacity; ACT records time of the reactive power compensator switching of each transformer station, number of units and capacity, and the state of the 500kV reactive power compensator under discontinuity surface time first is set to up-to-date Switching Strategy STR
2; t
e=0;
Step0: arrange t=1, discontinuity surface when representing first, by STR
2be updated to STR
0and STR
1, ACT empties;
Step1: by STR
2the operation of power networks data substituted under t section carry out Load flow calculation, and all 500kV transformer stations that there is the out-of-limit situation of busbar voltage are designated as S set TA
o; As STA
ofor sky, show to there is not out-of-limit situation, turn step2; If STA
obe not empty, show to there is voltage out-of-limit situation, turn step3;
Step2:t=t+1, if t > is T, turns step7; Otherwise, turn step1;
Step3: calculate 500kV reactive compensator of electrical network to STA
oin the voltage sensibility of all transformer stations, the preferential switching sequence list of reactive power compensator is set up according to voltage sensibility size, reactive power compensator is dropped into successively according to switching sequence list, and carry out Load flow calculation, until the 500kV substation bus bar voltage under t section meets bound requirement, and switching operation is updated to STR
2if, t
e=t, turns step4;
Step4:t
e=t
e-1, as t
e=0, turn step0; Otherwise, turn step5;
Step5: by STR
2substitute into t
eoperation of power networks data under section carry out Load flow calculation, judge whether to there is the out-of-limit situation of 500kV transformer substation voltage, as existed, turn step6; If do not existed, turn step4;
Step6: compare STR
1and STR
2, by different Reactive Power Device switching state updating to ACT, turn step2;
Step7: export optimum Switching Strategy STR
0and ACT, terminate to calculate.
3. multibreak the 500kV electric network reactive compensation Switching Strategy optimization method based on voltage sensibility according to claim 1, is characterized in that,
In described step (3), according to switching sequence list, switching is carried out to actual electric network reactive power compensator, and by electric power system specialty analysis software BPA, simulation analysis calculating is carried out to multiple electrical network profile data, whether checking there is the out-of-limit of 500kV substation bus bar voltage, meets service requirement.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023933A (en) * | 2015-10-27 | 2017-08-08 | 阿自倍尔株式会社 | Thermal source runs servicing unit and method |
| CN109713680A (en) * | 2019-03-11 | 2019-05-03 | 云南电网有限责任公司电力科学研究院 | Based on the area power grid voltage quickly regulating method for improving Sensitivity Method |
| CN110826228A (en) * | 2019-11-07 | 2020-02-21 | 国网四川省电力公司电力科学研究院 | Regional power grid operation quality limit evaluation method |
| CN115021278A (en) * | 2022-07-07 | 2022-09-06 | 扬州浩辰电力设计有限公司 | Switching strategy optimization method for multiple groups of switching reactive power compensation devices of 220kV transformer substation |
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| CN107023933A (en) * | 2015-10-27 | 2017-08-08 | 阿自倍尔株式会社 | Thermal source runs servicing unit and method |
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| CN115021278B (en) * | 2022-07-07 | 2023-09-29 | 扬州浩辰电力设计有限公司 | Switching strategy optimization method for multi-group switching reactive power compensation device of 220kV transformer substation |
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