CN105119267A - Static voltage stable level analyzing method for power grid - Google Patents

Static voltage stable level analyzing method for power grid Download PDF

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Publication number
CN105119267A
CN105119267A CN201510396169.8A CN201510396169A CN105119267A CN 105119267 A CN105119267 A CN 105119267A CN 201510396169 A CN201510396169 A CN 201510396169A CN 105119267 A CN105119267 A CN 105119267A
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static voltage
electrical network
voltage stability
analysis method
power grid
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CN105119267B (en
Inventor
黄霆
黄道姗
林韩
蔡振才
李海坤
林因
苏青梅
杨里
徐振华
项胤兴
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Economic and Technological Research Institute of State Grid Fujian Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Fujian Electric Power Co Ltd
State Grid Fujian Electric Power Co Ltd
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Abstract

The invention relates to a static voltage stable level analyzing method for a power grid. The method includes determining level year means data, forming a stable-state calculating data file and conducting trend calculation, forming desirable accident set and determining fault based on ground-state data with excellent convergence, conducting static voltage stable calculation and analysis, determining voltage stable weak nodes of the power grid at a power limit point through modal analysis, and improving the static voltage stable level by applying reactive compensation measures on weak nodes of the power grid. The power transmission profile of a regional power grid is taken into consideration, the consideration scope of static voltage stability is expanded, and the voltage collapse analysis is more thoroughly. The stable-state calculating data file is rapidly updated based on on-line power grid data and through database technology, and the work efficiency is improved.

Description

A kind of electrical network static voltage stability horizontal analysis method
Technical field
The present invention relates to operation and control of electric power system field, particularly a kind of electrical network static voltage stability horizontal analysis method.
Background technology
Power system voltage stabilization assessment is the pith in electricity net safety stable computational analysis.The object of voltage stabilization computational analysis is the static state of verification electrical network, transient state and growth process voltage stability, determines the safety and stability measure that the reactive-load compensation equipment allocation plan of electrical network, reactive power/voltage control strategy, low-voltage load sheding scheme etc. ensure voltage stabilities.
So far, the theoretical system of Voltage-stabilizing Problems is not yet perfect, and correlative study mainly concentrates on steady stability aspect.Conventional static voltage stability analysis method is introduced: first, by calculating the Voltage Stability Level of each voltage stabilization safety index (load bus power margin, area power nargin and the whole network power margin, and static voltage stability reserve factor) evaluation system; Secondly, by model analysis or the relatively weak region of Sensitivity Analysis Method identification voltage stabilization; Finally, by the region relatively weak at voltage stabilization, the measure such as reactive power compensator or the construction of reinforced region rack is installed and promotes electrical network static voltage stability level.Refer to Chinese invention patent (application number 201010599850.X).
In recent years, along with appearance and the extensive use of phase angle measurement unit (PMU), the appraisal procedure of the local Voltage Stability Level utilizing local metric data to carry out comes into one's own gradually and applies.Refer to Chinese invention patent (application number 200910263112.5).
Existing static voltage stability analysis method, only considers load bus/area power margin index size, had not considered transmission cross-section transmission power limit index.And in reality, the main thoroughfare that transmission cross-section is got in touch with external electrical network/power supply mutually as one's respective area electrical network, all can there is certain impact in the Voltage Stability Level of its transmission power size on the section of sending/receiving end electrical network.In information-based systems construction, prior art lays particular emphasis on quasi real time electrical network operating mode to quiescent voltage application more and carries out operation monitoring.Consider that the development of voltage collapse is comparatively slow, arrange so static voltage stability more should be applied to electrical network mode, plan the aspects such as power grid security proficiency assessment.
Summary of the invention
In view of this, the object of the invention is to propose a kind of electrical network static voltage stability horizontal analysis method, add the consideration to regional power grid transmission cross-section, extend the limit of consideration of static voltage stability.
The present invention adopts following scheme to realize: a kind of electrical network static voltage stability horizontal analysis method, specifically comprises the following steps:
Step S1: determine forcasted years mode data;
Step S2: form stable state calculated data file;
Step S3: this part of stable state calculated data formed according to step S2, carries out basic tidal current analysis calculating, if the distribution of numerical convergence, trend rationally and voltage is not out-of-limit, then enters step S4, otherwise returns step S1;
Step S4: form contingency set;
Step S5: static voltage stability analysis;
Step S6: weak node identification;
Step S7: formulate measure for improvement.
Further, forcasted years mode described in described step S1 comprise annual peak load mode, year minimum load mode and each maintenance mode of electrical network.Preferably, consider that general urban distribution network is under peak load mode, reactive load demand is comparatively large, and terminal voltage is relatively low; And under minimum load mode, electric network reactive-load has residue, voltage is relatively higher.So, generally can consider above-mentioned two kinds of operational modes by emphasis.
Further, described step S2 is specially: utilize database technology, sets up the contrast relationship table of electrical network CIM and BPA model, then based on electrical network E file, the data of BPA model are upgraded fast, generates BPA flow data file, and then obtain stable state calculated data file.
Further, contingency set described in described step S4 comprises electrical network normal mode and electric network fault mode, described electric network fault mode comprises the locking of direct current one pole, DC bipolar block, contact with foreign countries circuit N-1, common-tower double-return N-2, circuit N-2 in circuit N-1, region in region, main transformer N-1 in region.
Further, described step S5 specifically comprises the following steps:
Step S51: designing and calculating scene;
Step S52: the result index determining static voltage stability analysis;
Step S53: the index in calculation procedure S52, and judge whether each margin index exceeds standard, if exceed standard, enter step S6, otherwise, return step S1.
Especially, need the content considered to comprise in scene: the regional power grid scope that (1) clearly will calculate, Nei He district of district external power grid interconnection, determine regional power grid scope; (2) setting regions electrical network scope internal loading, generating set are exerted oneself growth pattern; (3) setting voltage range criterion.
Further, the result index of described static voltage stability analysis comprises load bus power margin, region/the whole network power margin, static voltage stability reserve factor and section transmission power limit.
Further, described step S6 is specially: the result calculated based on step S5 static voltage stability, and at stability limit point, place carries out model analysis, spread of voltage region and lose stable characteristic feature in certainty annuity, and then realizes weak node identification.
Further, described step S6 is specially: the result calculated based on step S5 static voltage stability, and on P-V curve, any point carries out model analysis, spread of voltage region and lose stable characteristic feature in certainty annuity, and then realizes weak node identification.
Further, for a power delivery scheme, if system can not meet the requirement of voltage stability margin, then need to formulate measure for improvement at weak node.In described step S7, measure comprises prevention and control, has carry load tap changer, generator operation Voltage Cortrol, shunt capacitance reactance switching etc. as regulated; Emergency control, as cutting load etc.; And planning proposal, as reinforcing mat shelf structure, increase local set grid-connection etc.
Compared with prior art, the stable state calculated data file processing technology adopted in electrical network real-time monitoring system is applied to off-line analysis and calculates by the present invention (1), based on this technology, the data file of the quick formation voltage stability Calculation of existed system data (SCADA system, Load Forecasting system, generation schedule system, maintenance scheduling system) can be utilized, for electrical network mode arranges, plans that power grid security proficiency assessment provides convenient, eliminate artificial organized data file link, greatly increase work efficiency; (2) in Network Voltage Stability evaluation process, except calculated load node power nargin, area power nargin, the whole network power margin and static voltage stability reserve factor index, also emphasis considers section transmission power limit index, add the consideration to regional power grid transmission cross-section, extend the limit of consideration of static voltage stability.
Accompanying drawing explanation
Fig. 1 is the inventive method flow chart.
Fig. 2 is that in the embodiment of the present invention, stable state calculated data file forms schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
As shown in Figure 1, present embodiments provide a kind of electrical network static voltage stability horizontal analysis method, specifically comprise the following steps:
Step S1: determine forcasted years mode data;
Step S2: form stable state calculated data file;
Step S3: this part of stable state calculated data formed according to step S2, carries out basic tidal current analysis calculating, if the distribution of numerical convergence, trend rationally and voltage is not out-of-limit, then enters step S4, otherwise returns step S1;
Step S4: form contingency set;
Step S5: static voltage stability analysis;
Step S6: weak node identification;
Step S7: formulate measure for improvement.
In the present embodiment, forcasted years mode described in described step S1 comprise annual peak load mode, year minimum load mode and each maintenance mode of electrical network.Preferably, consider that general urban distribution network is under peak load mode, reactive load demand is comparatively large, and terminal voltage is relatively low; And under minimum load mode, electric network reactive-load has residue, voltage is relatively higher.So, generally can consider above-mentioned two kinds of operational modes by emphasis.
In the present embodiment, described step S2 is specially: utilize database technology, sets up the contrast relationship table of electrical network CIM and BPA model, then based on electrical network E file, the data of BPA model are upgraded fast, generates BPA flow data file, and then obtain stable state calculated data file.
In the present embodiment, contingency set described in described step S4 comprises electrical network normal mode and electric network fault mode, described electric network fault mode comprises the locking of direct current one pole, DC bipolar block, contact with foreign countries circuit N-1, common-tower double-return N-2, circuit N-2 in circuit N-1, region in region, main transformer N-1 in region.
In the present embodiment, described step S5 specifically comprises the following steps:
Step S51: designing and calculating scene;
Step S52: the result index determining static voltage stability analysis;
Step S53: the index in calculation procedure S52, and judge whether each margin index exceeds standard, if exceed standard, enter step S6, otherwise, return step S1.
Especially, in the present embodiment, need the content considered to comprise in scene: the regional power grid scope that (1) clearly will calculate, Nei He district of district external power grid interconnection, determine regional power grid scope; (2) setting regions electrical network scope internal loading, generating set are exerted oneself growth pattern; (3) setting voltage range criterion.
In the present embodiment, the result index of described static voltage stability analysis comprises load bus power margin, region/the whole network power margin, static voltage stability reserve factor and section transmission power limit.
In the present embodiment, described step S6 is specially: the result calculated based on step S5 static voltage stability, at stability limit point, place carries out model analysis, spread of voltage region and lose stable characteristic feature in certainty annuity, and then realizes weak node identification.
In the present embodiment, described step S6 is specially: the result calculated based on step S5 static voltage stability, on P-V curve, any point carries out model analysis, spread of voltage region and lose stable characteristic feature in certainty annuity, and then realizes weak node identification.
In the present embodiment, for a power delivery scheme, if system can not meet the requirement of voltage stability margin, then need to formulate measure for improvement at weak node.In described step S7, measure comprises prevention and control, has carry load tap changer, generator operation Voltage Cortrol, shunt capacitance reactance switching etc. as regulated; Emergency control, as cutting load etc.; And planning proposal, as reinforcing mat shelf structure, increase local set grid-connection etc.
Especially, this enforcement additionally provides following specific implementation process:
As shown in Figure 2, electrical network typical case day E file, CIM during deriving history from SCADA system, for typical case's day electrical network static electric voltage stability analysis; To analyze the electrical network of planning period, then, except electrical network typical case day data file during above-mentioned history, also need result data files corresponding during derivation programming from Load Forecasting system, generation schedule system, maintenance scheduling system.
Set up the offline database towards BPA data model, set up corresponding showing with BPA model, comprise in table: subregion, ACBUS, ACLINE, LINEHG, TRAN, DCBUS, DCLINE, string are mended, etc.; Part corresponding relation is listed below.
BPA data name Database field is named
B* AC Bus_Card Key
OWNER AC Bus_Owner
Name AC Bus_Name
KV AC Bus_KV
ZONE AC Bus_Zone
LOAD P(MW) AC Bus_Load P
LOAD Q(MVar) AC Bus_Load Q
PMAX(MW) AC Bus_Pmax
PGEN(MW) AC Bus_PGen
Utilize offline database, steady state data file under the various mode of generation electrical network, then carries out Load flow calculation.
In steady state data file basis, all contingent faults are set, then filter out comparatively serious fault and carry out subsequent calculations.Screening principle: the fault that all users set is analyzed, finds out the fault that those voltage stability margins are minimum.The voltage stability margin of each fault refers to the power transmitting level P of initial launch point before fault 0with the power transmitting level P of the operating point that last trend solution after fault exists nbetween difference (P n-P 0).
Quiet steady analysis mainly contains two kinds of application modes: in interregional One-dimensional power transmission, region, increasing load and increasing are exerted oneself. for regional power grid, design the growth pattern of load, generator output respectively, then static voltage stability calculating is carried out to electrical network under normal mode, failure mode (fault type derives from the result of Contingency screening).
For somewhere electrical network, result of calculation is as follows.
(1) load bus reactive power nargin size is as shown in the table.
Sequence number Transformer station's title 110kV side (Mvar)
1 A transformer station -309
2 B transformer station -214
3 C transformer station -144
4 D transformer station -226
5 E transformer station -284
(2) region/the whole network power margin, static voltage stability reserve factor index are as shown in the table.
Before fault A station owner becomes N-1 A station owner becomes N-2
Initial voltage 0.98 0.9457 0.9747
Limiting voltage 0.61 0.6295 0.8291
Reserve factor 38% 33% /
Normal duty 1152 1152 1152
Limit power 2075 1635 399
Power margin 80% 42% -65%
(3) section transmission power limit is as shown in the table.
Before fault A section N-1 A section N-2
Initial voltage 0.99 0.98 0.96
Recover power 4061 4058 4056
Limiting voltage 0.91 0.89 0.90
Limit power 6314 6092 5323
Nargin coefficient 55% 50% 31%
To region/the whole network, section, respectively at its limit power point place, carry out model analysis, according to the size of participation factors, determine electrical network static voltage stability weak spot.Result of calculation is as shown in the table, and weak spot generally chooses the larger node of participation factors.
Sequence number Nodename Participation factors
1 A transformer station 10kV bus 1.000
2 A transformer station 110kV bus 0.966
3 B transformer station 10kV bus 0.737
4 B transformer station 110kV bus 0.727
5 C transformer station 10kV bus 0.560
Margin index is not met to the electrical network of standard-required, by formulating measure for improvement, until margin index meets the demands.Such as to by power, generally by the input, ULTC tap-c hange control, cutting load etc. of regulator generator and SVC voltage control, capacitor and reactor; Section ability to transmit electricity is general by increasing transmission line construction etc.
Especially, in implementation process, computational analysis adopts Chinese DianKeYuan BPA software.
In sum, first the present invention utilizes database technology, sets up the contrast relationship table of electrical network CIM and BPA model, then based on electrical network E file, upgrades fast BPA model data, generates BPA flow data file, obtains stable state calculated data file.This method, the data file of the quick formation voltage stability Calculation of existed system data (SCADA system, Load Forecasting system, generation schedule system, maintenance scheduling system) can be utilized, for electrical network mode arranges, plans that power grid security proficiency assessment provides convenient, eliminate artificial organized data file link, greatly increase work efficiency.Secondly, voltage collapse the very corn of a subject is that system cannot meet reactive requirement and causes, and its influencing factor may for too to use parallel capacitive compensation, but also likely exceeding delivery limits because of transmission cross-section through-put power causes.The present invention proposes, and on existing method basis, increases the consideration to transmission cross-section transmission power limit, except consider mains supply region by except power, consider the ability to transmit electricity of grid power transmission passage simultaneously, more thorough to voltage collapse analysis.Finally, in effect, the present invention more fits voltage collapse mechanism, and assessment result is closer to reality; In source data process, make full use of existing automated system, steady state data file under the various mode of generation, eliminates artificial organized data file link, increases work efficiency fast.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.

Claims (9)

1. an electrical network static voltage stability horizontal analysis method, is characterized in that comprising the following steps:
Step S1: determine forcasted years mode data;
Step S2: form stable state calculated data file;
Step S3: this part of stable state calculated data formed according to step S2, carries out basic tidal current analysis calculating, if the distribution of numerical convergence, trend rationally and voltage is not out-of-limit, then enters step S4, otherwise returns step S1;
Step S4: form contingency set;
Step S5: static voltage stability analysis;
Step S6: weak node identification;
Step S7: formulate measure for improvement.
2. a kind of electrical network static voltage stability horizontal analysis method according to claim 1, is characterized in that: forcasted years mode described in described step S1 comprise annual peak load mode, year minimum load mode and each maintenance mode of electrical network.
3. a kind of electrical network static voltage stability horizontal analysis method according to claim 1, it is characterized in that: described step S2 is specially: utilize database technology, set up the contrast relationship table of electrical network CIM and BPA model, then based on electrical network E file, the data of BPA model are upgraded fast, generate BPA flow data file, and then obtain stable state calculated data file.
4. a kind of electrical network static voltage stability horizontal analysis method according to claim 1, it is characterized in that: the contingency set described in described step S4 comprises electrical network normal mode and electric network fault mode, described electric network fault mode comprises the locking of direct current one pole, DC bipolar block, contact with foreign countries circuit N-1, common-tower double-return N-2, circuit N-2 in circuit N-1, region in region, main transformer N-1 in region.
5. a kind of electrical network static voltage stability horizontal analysis method according to claim 1, is characterized in that: described step S5 specifically comprises the following steps:
Step S51: designing and calculating scene;
Step S52: the result index determining static voltage stability analysis;
Step S53: the index in calculation procedure S52, and judge whether each margin index exceeds standard, if exceed standard, enter step S6, otherwise, return step S1.
6. a kind of electrical network static voltage stability horizontal analysis method according to claim 5, is characterized in that: the result index of described static voltage stability analysis comprises load bus power margin, region/the whole network power margin, static voltage stability reserve factor and section transmission power limit.
7. a kind of electrical network static voltage stability horizontal analysis method according to claim 1, it is characterized in that: described step S6 is specially: the result calculated based on step S5 static voltage stability, at stability limit point, place carries out model analysis, spread of voltage region and lose stable characteristic feature in certainty annuity, and then realize weak node identification.
8. a kind of electrical network static voltage stability horizontal analysis method according to claim 1, it is characterized in that: described step S6 is specially: the result calculated based on step S5 static voltage stability, on P-V curve, any point carries out model analysis, spread of voltage region and lose stable characteristic feature in certainty annuity, and then realize weak node identification.
9. a kind of electrical network static voltage stability horizontal analysis method according to claim 1, is characterized in that: in described step S7, measure comprises prevention and control, emergency control and planning proposal.
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CN106972494A (en) * 2017-05-18 2017-07-21 广西大学 A kind of AC-DC hybrid power grid sends section conveying power optimization method outside
CN107069747A (en) * 2017-03-27 2017-08-18 国网浙江省电力公司电力科学研究院 A kind of minimum start-up mode based on regional voltage stabilization determines method
CN109167357A (en) * 2018-10-18 2019-01-08 国网山东省电力公司泰安供电公司 A method of the optimization power grid static security analysis time

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105490281A (en) * 2015-12-04 2016-04-13 国网内蒙古东部电力有限公司电力科学研究院 Layered and zoned reactive voltage analysis method based on boundary condition
CN105490281B (en) * 2015-12-04 2018-01-09 国网内蒙古东部电力有限公司电力科学研究院 Layering and zoning reactive voltage analysis method based on boundary condition
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CN107069747A (en) * 2017-03-27 2017-08-18 国网浙江省电力公司电力科学研究院 A kind of minimum start-up mode based on regional voltage stabilization determines method
CN107069747B (en) * 2017-03-27 2019-07-26 国网浙江省电力公司电力科学研究院 A kind of minimum start-up mode based on regional voltage stabilization determines method
CN106972494A (en) * 2017-05-18 2017-07-21 广西大学 A kind of AC-DC hybrid power grid sends section conveying power optimization method outside
CN109167357A (en) * 2018-10-18 2019-01-08 国网山东省电力公司泰安供电公司 A method of the optimization power grid static security analysis time

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