CN105490281A - Layered and zoned reactive voltage analysis method based on boundary condition - Google Patents
Layered and zoned reactive voltage analysis method based on boundary condition Download PDFInfo
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Abstract
The invention belongs to the technical field of reactive voltage control of a power grid, in particular relates to a layered and zoned reactive voltage analysis method based on a boundary condition. The layered and zoned reactive voltage analysis method comprises the following steps of making the power grid layered and zoned; determining a researched zone and a boundary thereof; inputting maximum daily load, minimum daily load, output of a power generator, the boundary condition, a reactive compensation configuration condition and a limit value of a regional power grid; carrying out power flow calculation, adjusting reactive compensation capacity, and adjusting the boundary of the regional power grid to the boundary condition; judging whether an out-of-limit situation exists in the voltage in a region or not; and judging whether a power factor of each main transformer conforms to the stipulation of the limit value or not. According to the layered and zoned reactive voltage analysis method, reactive voltage correction and reactive voltage optimization can be fulfilled, the reactive voltage analysis efficiency of a large-sized power grid can be substantially improved, focused analysis can be conducted with regard to a local power grid, and the layered and zoned reactive voltage analysis method is suitably used for situations with relatively complete data of the local power grid and insufficient data of a large power grid; and the layered and zoned reactive voltage analysis method is easy to understand and implement, is proximate to actual running of the power grid, and is suitably for on-line application.
Description
Technical field
The invention belongs to electric network reactive-load voltage control technical field, particularly relate to a kind of layering and zoning reactive voltage analytical method based on boundary condition.
Background technology
In current electric power system, along with load growth and every newly-increased engineering are constantly carried out, grid operating conditions more sophisticated, reactive power/voltage control faces various new challenge.For ensureing voltage running quality, being necessary to follow the tracks of the change of electric network reactive-load voltage condition, carrying out electric network reactive-load voltage analysis in time, propose practicable decision recommendation.Reactive voltage analysis has become the indispensable work of in current power grid construction maintenance process one, to electrical network safe, stable, economical operation is significant.Along with bulk power grid is interconnected, electrical network scale constantly expands, and reactive voltage analysis efficiency is in urgent need to be improved.
At present, mostly concentrate on idle work optimization aspect to the research of reactive power/voltage control, and comparatively lack the research of reactive voltage check method, and bulk power grid analysis efficiency is not high, when only having partial electric grid data, electric network reactive-load voltage analysis is limited.
Summary of the invention
For overcoming the defect existed in prior art, the invention provides a kind of layering and zoning reactive voltage analytical method based on boundary condition, its objective is to provide one significantly can improve electric network reactive-load voltage analysis efficiency, and selective analysis can be carried out for partial electric grid, for operation of power networks decision-making provides the reactive voltage analytical method of guidance.
To achieve the above object of the invention, the technical solution adopted in the present invention is:
Based on the layering and zoning reactive voltage analytical method of boundary condition, comprise the following steps:
Step 1: layering and zoning is carried out to electrical network;
Step 2: determine institute's survey region and border thereof;
Step 3: input maximum, minimum load daily load and generator output, boundary condition, reactive power compensation configuring condition, regional power grid limit value;
Step 4: carry out Load flow calculation, regulates reactive compensation capacity, regional power grid border is adjusted to boundary condition;
Step 5: in judging area, whether voltage exists out-of-limit situation;
Step 6: judge whether each main transformer power factor meets limit value regulation.
The concrete grammar that in described step 1, layering and zoning adopts is: according to different electric pressure layering, same electric pressure electrical network is divided into one deck; In same layer electrical network, carry out subregion according to geographical position and load supply district, which district transformer station is divided according to by which district being powered, and the transformer station of simultaneously being powered by not same district, is assigned in each district by supply load size.
Determine institute's survey region in described step 2, namely need the regional power grid determining next will study according to research; Describedly determine border, refer to the transformer station selecting institute's survey region electrical network and be connected with last layer electrical network, as the border of this survey region.
Peak day described in described step 3, refer to maximum a day of area power grid load in the middle of a year and minimum one day of load minimum load day respectively, this patent using peak day and minimum load day as two kinds of voltage analysis situations; Described input is maximum, minimum load daily load and generator output, refers to using the load of Japan-China for peak load each plant stand, each generator output as a kind of voltage analysis situation, analyzed area electrical network low voltage problem; Using the load of Japan-China for minimum load each plant stand, each generator output as a kind of voltage analysis situation, analyzed area electrical network high voltage problem; Described boundary condition refers to, using institute's survey region electrical network border transformer station in the voltage of maximum, minimum load day and power factor as boundary condition; Described reactive power compensation configuring condition, refers to and obtains survey region electrical network each transformer station of institute inductive reactive power compensation device configuration total capacity Q
lmax, capacitive reactive power compensation arrangement configuration total capacity Q
cmax; Described regional power grid restriction, refers to regional power grid each plant stand normal operating voltage limit value, power factor limit value;
The mode of carrying out Load flow calculation described in described step 4 comprises:
Mode one: each plant stand load is peak load daily load, each generator output is peak load daily output, within the scope of each Reactive Power Compensation Eqyuipment in Substation configuration total capacity, regulate the reactive compensation capacity dropped into, the voltage of border transformer station and power factor are adjusted to peak day level, calculate each plant stand voltage;
Mode two: each plant stand load is minimum load daily load, each generator output is minimum load daily output, within the scope of each Reactive Power Compensation Eqyuipment in Substation configuration total capacity, regulate the reactive compensation capacity dropped into, the voltage of border transformer station and power factor are adjusted to peak day level, calculate each plant stand voltage.
In judging area described in described step 5, whether voltage exists out-of-limit situation, refer to the voltage result of calculation will obtained in step 4, the each plant stand normal operating voltage limit value inputted with step 3 compares, and judges whether voltage result of calculation exists out-of-limit situation and comprise with under type:
(1) if there is voltage out-of-limit situation, then the out-of-limit reason of analytical voltage, finely tunes the reactive compensation capacity dropped into, and re-starts voltage and calculates; If it is out-of-limit still to there is transformer substation voltage, then exports this transformer station and out-of-limit voltage, carry out next step; If it is out-of-limit to there is not transformer substation voltage, then carry out next step;
(2) if there is not voltage out-of-limit situation, then output area voltage condition is good, carries out next step.
Judge described in described step 6 whether each main transformer power factor meets in the mode that limit value specifies, the power factor of each main transformer calculates, each plant stand normal operate power factor limit value result of calculation and step 3 inputted compares, and judges whether each main transformer power factor exists the situation exceeding limit value;
(1) situation that main transformer power factor exceeds limit value if do not exist, then export this region main transformer power factor good;
(2) situation that main transformer power factor exceeds limit value if exist, then export out-of-limit main transformer and out-of-limit power factor, and analyze out-of-limit reason, and carry out adjusting and optimizing for concrete reason.
In described step 3: input maximum, minimum load daily load and generator output, boundary condition, reactive power compensation configuring condition, regional power grid limit value, refers to that electric network information is inputted PSASP simulation software carries out reactive voltage analysis; Described PSASP simulation software is not limited to a kind of simulation calculation software.
In described step 4: carrying out Load flow calculation can calculate by the multiple computational methods such as Newton-Raphson approach, gauss seidel method, is not limited to a kind of tidal current computing method.
Advantage of the present invention and beneficial effect are:
The present invention is simplified studied electrical network by layering and zoning and boundary condition equivalence; By regulating existing reactive power compensation to drop into capacity, carrying out electric network swim calculating, judging that in electrical network, whether transformer substation voltage is out-of-limit, checking existing reactive-load compensation equipment configuring condition and whether meet relevant regulations and Voltage Cortrol needs; By adjustment main transformer power factor in prescribed limits, electric network reactive-load distribution is optimized.The method is comparatively comprehensive, can carry out reactive voltage check and reactive Voltage Optimum simultaneously; And the method to bulk power grid layering and zoning, significantly improves large scale electric network reactive voltage analysis efficiency by boundary condition equivalence.And selective analysis can be carried out for the regional area electrical network of in bulk power grid by emphasis, do not need the whole network modeling, be applicable to regional power grid data comparatively complete, but the situation of bulk power grid data deficiencies.Easy to understand and realization also press close to operation of power networks reality, are applicable to application on site.
Below in conjunction with the drawings and specific embodiments, the preferred embodiment of the present invention is described in detail.It is emphasized that following explanation is only exemplary, instead of in order to limit the scope of the invention and apply.
Accompanying drawing explanation
Fig. 1 is the layering and zoning reactive voltage analytical method flow chart that the present invention is based on boundary condition;
Fig. 2 is the electric network wiring scheme that the embodiment of the present invention provides.
Embodiment
Embodiment 1:
The present invention is a kind of layering and zoning reactive voltage analytical method based on boundary condition, and as shown in Figure 1, Fig. 1 is the layering and zoning reactive voltage analytical method flow chart based on boundary condition, and concrete operation step comprises:
Step 1: layering and zoning is carried out to electrical network.
The concrete grammar that described layering and zoning adopts is: according to different electric pressure layering, same electric pressure electrical network is divided into one deck; In same layer electrical network, carry out subregion according to geographical position and load supply district, which district transformer station is divided according to by which district being powered, and the transformer station of simultaneously being powered by not same district, is assigned in each district by supply load size.
Step 2: determine institute's survey region and border thereof.
Describedly determine institute's survey region, namely need the regional power grid determining next will study according to research.
Describedly determine border, refer to the transformer station selecting institute's survey region electrical network and be connected with last layer electrical network, as the border of this survey region.
Step 3: input maximum, minimum load daily load and generator output, boundary condition, reactive power compensation configuring condition, regional power grid limit value.
Described peak day, refer to maximum a day of area power grid load in the middle of a year and minimum one day of load minimum load day respectively, this patent using peak day and minimum load day as two kinds of voltage analysis situations.
Described input is maximum, minimum load daily load and generator output, refers to using the load of Japan-China for peak load each plant stand, each generator output as a kind of voltage analysis situation, analyzed area electrical network low voltage problem; Using the load of Japan-China for minimum load each plant stand, each generator output as a kind of voltage analysis situation, analyzed area electrical network high voltage problem.
Described boundary condition refers to, using institute's survey region electrical network border transformer station in the voltage of maximum, minimum load day and power factor as boundary condition.
Described reactive power compensation configuring condition, refers to and obtains survey region electrical network each transformer station of institute inductive reactive power compensation device configuration total capacity Q
lmax, capacitive reactive power compensation arrangement configuration total capacity Q
cmax.
Described regional power grid limit value, refers to regional power grid each plant stand normal operating voltage limit value, power factor limit value.
The various simulation softwares such as above-mentioned electric network information input PSASP are carried out reactive voltage analysis, is not limited to a kind of simulation software.
Step 4: carry out Load flow calculation, regulates reactive compensation capacity, regional power grid border is adjusted to boundary condition.
Can in PSASP simulation software, two kinds of modes be divided to carry out Load flow calculation:
Mode one: each plant stand load is peak load daily load, each generator output is peak load daily output, within the scope of each Reactive Power Compensation Eqyuipment in Substation configuration total capacity, regulate the reactive compensation capacity dropped into, the voltage of border transformer station and power factor are adjusted to peak day level, calculate each plant stand voltage.
Mode two: each plant stand load is minimum load daily load, each generator output is minimum load daily output, within the scope of each Reactive Power Compensation Eqyuipment in Substation configuration total capacity, regulate the reactive compensation capacity dropped into, the voltage of border transformer station and power factor are adjusted to peak day level, calculate each plant stand voltage.
In this step, the method for carrying out Load flow calculation also comprises carries out Load flow calculation by computational methods such as Newton-Raphson approach, your computational methods of Gauss's Saden, is not limited to a kind of tidal current computing method.
Step 5: in judging area, whether voltage exists out-of-limit situation.
In above-mentioned steps 4, after PSASP Load flow calculation, the voltage result of calculation EACEL under exportable mode one, mode 2 two kinds of modes shows, and conveniently carries out sequence and compares.
In described judging area, whether voltage exists out-of-limit situation, refers to the voltage result of calculation will obtained in step 4, and each plant stand normal operating voltage limit value inputted with step 3 compares, and judges whether voltage result of calculation exists out-of-limit situation.
(1) if there is voltage out-of-limit situation, then the out-of-limit reason of analytical voltage, finely tunes the reactive compensation capacity dropped into, again in PSASP software, carries out Load flow calculation.If it is out-of-limit still to there is transformer substation voltage, then exports this transformer station and out-of-limit voltage, carry out next step; If it is out-of-limit to there is not transformer substation voltage, then carry out next step.
(2) if there is not voltage out-of-limit situation, then output area voltage condition is good, carries out next step.
Step 6: judge whether each main transformer power factor meets limit value regulation.
After respectively Load flow calculation being carried out to mode one, mode 2 two kinds of modes in PSASP software, conveniently can export the power factor of each main transformer, each plant stand normal operate power factor limit value that main transformer power factor (PF) calculating result and step 3 input is compared, judges whether each main transformer power factor exists the situation exceeding limit value.
(1) situation that main transformer power factor exceeds limit value if do not exist, then export this region main transformer power factor good.
(2) situation that main transformer power factor exceeds limit value if exist, then export out-of-limit main transformer and out-of-limit power factor, and analyze out-of-limit reason.And carry out adjusting and optimizing for concrete reason.
Embodiment 2:
Below using the Inner Mongol in 2015 Chifeng electrical network as one embodiment of the present of invention, summary of the invention of the present invention is described further.
First layering and zoning is carried out to Chifeng's electrical network, be divided into four layers by 500kV, 220kV, 66kV, 10kV; Citing research 66kV level electrical network, by load supply district and geographical position subregion, be divided into Zhong jing system, flat village system, bright and beautiful mountain system system, Chifeng's system, golden ditch girder system system, woods east system, Tianshan Mountains system, too native system, western suburb system, Ningcheng system, hot-water heating system, black red system, large plate system, Yuanbaoshan Power Station system, new favour system, copper all system, city east system totally 17 regions.
Determine that survey region is 66kV brocade mountain system system, brocade Mountain area, Inner Mongol Chifeng electric network wiring scheme as shown in Figure 2.
Determine that the border in this region is that 220kV Jin Shan becomes, boundary condition comprises Jin Shan and becomes 66kV side voltage, Jin Shan change high-pressure side power factor.
Input the peak load daily load (peak load) at each station, minimum load daily load (minimum load), and reactive power compensator configuring condition, as shown in table 1.This area without power plant, so do not need input generating set load daily output situation.
Input bright and beautiful mountain electrical network boundary condition numerical value:
(1) low voltage condition (peak day): Jin Shan becomes 66kV side voltage is 65.3kV; Jin Shan becomes high-pressure side power factor 0.957;
(2) high voltage situation (minimum load day): Jin Shan becomes 66kV side voltage is 67.5kV; Jin Shan becomes high-pressure side power factor 0.991.
Input area electrical network limit value comprises: each 66kV transformer station normally runs busbar voltage and controls between 64.02-70.62kV; Each transformer station 10kV side bus voltage control 10-10.7kV; The controlled 0.8-0.85 of generator power factor of access 66kV electrical network controls; 66kV main transformer power factor controlling is at 0.9-1; 220kV main transformer power factor controlling is at 0.95-1.
Use PSASP software to carry out Load flow calculation, the reactive compensation capacity of regulating allocation to large Smaller load two kinds of modes, regional power grid border is adjusted to boundary condition respectively.
As calculated, under large load method, Wang Yedian becomes 66kV busbar voltage and is low to moderate 61.4kV, and after Western Hills change input capacitor, 10kV busbar voltage is 9.95kV, all lower than normal operating voltage lower limit; It is 10.87kV that Wang Yedian becomes 10kV bus, runs the upper limit higher than voltage.Under Smaller load mode, it is 10.8kV that Wang Yedian becomes 10kV busbar voltage into 11kV, Niu Yingzi become 10kV busbar voltage, all runs the upper limit higher than voltage.
Wang Yedian becomes, Niu Yingzi becomes main transformer power factor all lower than 0.9, does not meet service requirement.
1, analyze reason: Wang Yedian change and belong to system end station, load or burden without work is comparatively large, and load power factor is low, is 0.78, cause occurring low-voltage problem, and this station does not configure reactive power compensator.Be optimized to 0.9 at the load power factor become by Wang Yedian, and to after the load or burden without work local compensation that little mansion becomes, 40 homes become on same circuit, after Wang Yedian becomes new input 6Mvar capacitor, 66kV busbar voltage can rise to acceptability limit.
Further, two, prosperous industry pasture main transformer no-load voltage ratio is inconsistent, is respectively 63 ± 2 × 2.5%/11,66 ± 2 × 2.5%/11.No-load voltage ratio is inconsistent causes idle flowing in station, reduce further prosperous industry pasture Variable power factor.The most high tap position that two main transformers can be adjusted to no-load voltage ratio close is respectively 1 grade and 3 grades.
Solution: suggestion improves load power factor, and prosperous industry pasture Variable power factor is optimized to 0.9.Current Wang Yedian station does not configure reactive power compensator, considers that this station relocates newly-built, and suggestion new website should at least configure 6Mvar capacitor.
2, analyze reason: Niu Yingzi change and have two No-load changer main transformers at present, the capacitor of one group of 1.2Mvar.Low and two the inconsistent main transformer power factors that cause of main transformer no-load voltage ratio of load power factor are lower than 0.9.Under size mode, there is the problem regulating difficulty in 10kV busbar voltage.As calculated, main transformer shunting switch is adjusted to 2 grades for the most rational operational taps.
Solution: suggestion improves load power factor, seeks sub-Variable power factor and is optimized to 0.9, Niu Yingzi and becomes and have and relocate newly-built plan by ox, and with the growth of load, the high voltage problem of 10kV side will be alleviated to some extent.
3, reason is analyzed: Western Hills become 10kV busbar voltage pressure regulation difficulty, at present the capacitor of a configuration 1.5Mvar, and #1 main transformer is totally 17 gears, on-load voltage regulation; #2 main transformer is totally 5 gears, No-load changer.#1 main transformer is at 5 grades, and #2 is relatively reasonable operational taps at 1 grade.
Solution: suggestion Western Hills become the capacitor of an increase 2Mvar.
After above-mentioned Voltage Cortrol, solve voltage and the out-of-limit problem of main transformer power factor, regional voltage condition is good, and reactive voltage distribution is optimized.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Table 1: input information table.
Claims (9)
1., based on the layering and zoning reactive voltage analytical method of boundary condition, it is characterized in that: comprise the following steps:
Step 1: layering and zoning is carried out to electrical network;
Step 2: determine institute's survey region and border thereof;
Step 3: input maximum, minimum load daily load and generator output, boundary condition, reactive power compensation configuring condition, regional power grid limit value;
Step 4: carry out Load flow calculation, regulates reactive compensation capacity, regional power grid border is adjusted to boundary condition;
Step 5: in judging area, whether voltage exists out-of-limit situation;
Step 6: judge whether each main transformer power factor meets limit value regulation.
2. the layering and zoning reactive voltage analytical method based on boundary condition according to claim 1, is characterized in that: the concrete grammar that in described step 1, layering and zoning adopts is: according to different electric pressure layering, same electric pressure electrical network is divided into one deck; In same layer electrical network, carry out subregion according to geographical position and load supply district, which district transformer station is divided according to by which district being powered, and the transformer station of simultaneously being powered by not same district, is assigned in each district by supply load size.
3. the layering and zoning reactive voltage analytical method based on boundary condition according to claim 1, is characterized in that: determine institute's survey region in described step 2, namely needs the regional power grid determining next will study according to research; Describedly determine border, refer to the transformer station selecting institute's survey region electrical network and be connected with last layer electrical network, as the border of this survey region.
4. the layering and zoning reactive voltage analytical method based on boundary condition according to claim 1, it is characterized in that: peak day described in described step 3, refer to maximum a day of area power grid load in the middle of a year and minimum one day of load minimum load day respectively, this patent using peak day and minimum load day as two kinds of voltage analysis situations;
Described input is maximum, minimum load daily load and generator output, refers to using the load of Japan-China for peak load each plant stand, each generator output as a kind of voltage analysis situation, analyzed area electrical network low voltage problem; Using the load of Japan-China for minimum load each plant stand, each generator output as a kind of voltage analysis situation, analyzed area electrical network high voltage problem;
Described boundary condition refers to, using institute's survey region electrical network border transformer station in the voltage of maximum, minimum load day and power factor as boundary condition;
Described reactive power compensation configuring condition, refers to and obtains survey region electrical network each transformer station of institute inductive reactive power compensation device configuration total capacity, capacitive reactive power compensation arrangement configuration total capacity;
Described regional power grid restriction, refers to regional power grid each plant stand normal operating voltage limit value, power factor limit value.
5. the layering and zoning reactive voltage analytical method based on boundary condition according to claim 1, is characterized in that: the mode of carrying out Load flow calculation described in described step 4 comprises:
Mode one: each plant stand load is peak load daily load, each generator output is peak load daily output, within the scope of each Reactive Power Compensation Eqyuipment in Substation configuration total capacity, regulate the reactive compensation capacity dropped into, the voltage of border transformer station and power factor are adjusted to peak day level, calculate each plant stand voltage;
Mode two: each plant stand load is minimum load daily load, each generator output is minimum load daily output, within the scope of each Reactive Power Compensation Eqyuipment in Substation configuration total capacity, regulate the reactive compensation capacity dropped into, the voltage of border transformer station and power factor are adjusted to peak day level, calculate each plant stand voltage.
6. the layering and zoning reactive voltage analytical method based on boundary condition according to claim 1, it is characterized in that: in judging area described in described step 5, whether voltage exists out-of-limit situation, refer to the voltage result of calculation will obtained in step 4, the each plant stand normal operating voltage limit value inputted with step 3 compares, and judges whether voltage result of calculation exists out-of-limit situation and comprise with under type:
(1) if there is voltage out-of-limit situation, then the out-of-limit reason of analytical voltage, finely tunes the reactive compensation capacity dropped into, and re-starts voltage and calculates; If it is out-of-limit still to there is transformer substation voltage, then exports this transformer station and out-of-limit voltage, carry out next step; If it is out-of-limit to there is not transformer substation voltage, then carry out next step;
(2) if there is not voltage out-of-limit situation, then output area voltage condition is good, carries out next step.
7. the layering and zoning reactive voltage analytical method based on boundary condition according to claim 1, it is characterized in that: described in described step 6, judge whether each main transformer power factor meets in the mode that limit value specifies, the power factor of each main transformer calculates, each plant stand normal operate power factor limit value result of calculation and step 3 inputted compares, and judges whether each main transformer power factor exists the situation exceeding limit value;
(1) situation that main transformer power factor exceeds limit value if do not exist, then export this region main transformer power factor good;
(2) situation that main transformer power factor exceeds limit value if exist, then export out-of-limit main transformer and out-of-limit power factor, and analyze out-of-limit reason, and carry out adjusting and optimizing for concrete reason.
8. the layering and zoning reactive voltage analytical method based on boundary condition according to claim 1, it is characterized in that: in described step 3: input maximum, minimum load daily load and generator output, boundary condition, reactive power compensation configuring condition, regional power grid limit value, refers to that electric network information is inputted PSASP simulation software carries out reactive voltage analysis; Described PSASP simulation software is not limited to a kind of simulation calculation software.
9. the layering and zoning reactive voltage analytical method based on boundary condition according to claim 1, it is characterized in that: in described step 4: carrying out Load flow calculation can calculate by the multiple computational methods such as Newton-Raphson approach, gauss seidel method, is not limited to a kind of tidal current computing method.
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| CN106130005A (en) * | 2016-05-13 | 2016-11-16 | 国家电网公司 | 220kV sub area division boundary node processing method based on geographical zone |
| CN109103947A (en) * | 2018-08-24 | 2018-12-28 | 国家电网公司西北分部 | A method of plant stand no-power vacancy is determined using reactive balance |
| CN109347117A (en) * | 2018-11-30 | 2019-02-15 | 国网河北省电力有限公司 | A kind of power distribution network energy storage bidirectional converter Reactive-power control method |
| CN110601212A (en) * | 2019-09-23 | 2019-12-20 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Method and system for determining main transformer transformation ratio of power grid based on reactive power optimization configuration |
| CN110797879A (en) * | 2019-11-15 | 2020-02-14 | 国网浙江省电力有限公司经济技术研究院 | Power grid reactive resource allocation method based on voltage avoidance out-of-limit |
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