CN112994050A - Method and device for treating station area unbalance based on standard deviation degree - Google Patents

Method and device for treating station area unbalance based on standard deviation degree Download PDF

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CN112994050A
CN112994050A CN202110509737.6A CN202110509737A CN112994050A CN 112994050 A CN112994050 A CN 112994050A CN 202110509737 A CN202110509737 A CN 202110509737A CN 112994050 A CN112994050 A CN 112994050A
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phase
standard deviation
day
current
mutation data
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CN112994050B (en
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邓才波
安义
周求宽
范瑞祥
郭亮
刘洋
蔡木良
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Nanchang Kechen Electric Power Test Research Co ltd
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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Nanchang Kechen Electric Power Test Research Co ltd
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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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
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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Abstract

The invention discloses a method and a device for treating the unbalance of a distribution room based on standard deviation degree, wherein the method comprises the following steps: calculating the three-phase unbalance degree of each moment every day in a certain time period based on the obtained three-phase current in the certain time period; judging whether an unbalance out-of-limit event occurs at the x-th day t moment or not according to the three-phase unbalance and three-phase active power in a certain time period; if an unbalanced out-of-limit event occurs at the time t of the x day, classifying the phase currents at the time t of the x day into a set
Figure 534268DEST_PATH_IMAGE001
And calculate a set
Figure 920250DEST_PATH_IMAGE001
The standard deviation of the three-phase current at each moment and the standard deviation degree before and after the mutation data point; and selecting an unbalanced treatment scheme based on the standard deviation, the standard deviation, the continuous days and the difference mutation data points of the three-phase current. By calculation ofThe standard deviation degree is beneficial to quickly, accurately and effectively selecting the optimal treatment scheme, the purpose of three-phase balance of the low-voltage distribution network is achieved, and a reference basis is provided for selecting the three-phase unbalance treatment scheme.

Description

Method and device for treating station area unbalance based on standard deviation degree
Technical Field
The invention belongs to the technical field of power quality management, and particularly relates to a method and a device for managing station area unbalance based on standard deviation degree.
Background
In recent years, with the continuous development of economy in China, the load in a power distribution network is increased day by day, and great pressure is brought to the operation of a power grid. Meanwhile, each distribution area in the distribution network in China mostly adopts a three-phase four-wire system wiring mode, most of loads are single-phase loads, and the three-phase loads are unbalanced due to the difference of running time and the nonuniformity of distribution.
In order to solve the problem, various power supply companies adopt different treatment measures, and the main measures are as follows: artificial phase modulation, automatic phase modulation device and additional compensation device. The manual phase modulation realizes three-phase balance mainly by manually adjusting the access phase sequence of user load, and the method generally adjusts once a quarter or half a year, has longer adjustment time interval and is suitable for distribution areas with more consistent load change rules. The automatic phase modulation device can automatically modulate the phase, but the treatment effect and the service life of the device are easily influenced by the load change. The additional compensation device achieves the purpose of three-phase balance by carrying out asymmetric compensation on the load, has the best treatment effect among the three, but has higher investment cost, and is suitable for the transformer area with strong unbalanced time variation and more impact loads.
However, current research on three-phase imbalance abatement focuses on reactive compensation using power devices or optimization of phase sequence adjustment strategies using intelligent algorithms, and little is concerned with optimization for abatement schemes. In addition, operation and maintenance personnel at the present stage often select a treatment scheme according to experience, and a scientific selection method is lacked, so that the treatment effect or the economy is poor. Therefore, the most appropriate treatment scheme needs to be selected from the manual phase modulation device, the automatic phase modulation device and the additional compensation device according to different load characteristics of each transformer area, so that the optimal treatment effect is achieved, and the three-phase balanced operation of the transformer area is realized.
Disclosure of Invention
The invention provides a method and a device for treating the unbalance of a distribution room based on standard deviation degree, which are used for solving at least one technical problem.
In a first aspect, the invention provides a method for calculating the three-phase unbalance degree of each time every day based on the obtained three-phase current of a certain time period in the peak-facing summer or winter period of the previous annual distribution area; judging whether an unbalanced out-of-limit event occurs at the time t of the x day according to the three-phase unbalance and three-phase active power of a certain time period in the peak-facing summer or winter period of the previous year distribution area; if an unbalanced out-of-limit event occurs at the time t of the x day, classifying the phase currents at the time t of the x day into a set
Figure 274655DEST_PATH_IMAGE001
And calculating said set
Figure 243748DEST_PATH_IMAGE001
The standard deviation of the three-phase current at each moment and the standard deviation degree before and after the mutation data point are shown in the specification, wherein the calculation expression of the standard deviation of the three-phase current is as follows:
Figure 320158DEST_PATH_IMAGE002
in the formula (I), the compound is shown in the specification,
Figure 323886DEST_PATH_IMAGE003
respectively as the standard deviation of phase A current, the standard deviation of phase B current and the standard deviation of phase C current on the x-th day,
Figure 578281DEST_PATH_IMAGE004
、
Figure 34670DEST_PATH_IMAGE005
、
Figure 914770DEST_PATH_IMAGE006
the average value of the phase A current on the x-th day, the average value of the phase B current on the x-th day and the average value of the phase C current on the x-th day are respectively,
Figure 773005DEST_PATH_IMAGE007
as set on day x
Figure 463880DEST_PATH_IMAGE001
The number of elements contained in (a) is,
Figure 407565DEST_PATH_IMAGE008
、
Figure 108935DEST_PATH_IMAGE009
、
Figure 821676DEST_PATH_IMAGE010
phase A current, phase B current and phase C current at the ith moment of the x day respectively; the calculation expression of the standard deviation degree before and after the mutation data point is as follows:
Figure 683452DEST_PATH_IMAGE011
in the formula (I), the compound is shown in the specification,
Figure 114434DEST_PATH_IMAGE012
mutation data points on day x, respectively
Figure 336337DEST_PATH_IMAGE013
The standard deviation degree of the front and back A-phase current, the standard deviation degree of the B-phase current and the standard deviation degree of the C-phase current,
Figure 903584DEST_PATH_IMAGE007
as set on day x
Figure 936262DEST_PATH_IMAGE001
The number of mutation data points contained in (a),
Figure 854540DEST_PATH_IMAGE014
、
Figure 614554DEST_PATH_IMAGE015
、
Figure 301887DEST_PATH_IMAGE016
the 1 st to the 1 st mutation data points on the x-th day
Figure 771046DEST_PATH_IMAGE013
Standard deviation of A-phase current of each mutation data point, 1 st mutation data point to the x th mutation data point on x th day
Figure 35674DEST_PATH_IMAGE013
Standard deviation of B-phase current of each mutation data point, 1 st mutation data point to the x th mutation data point on the x th day
Figure 740325DEST_PATH_IMAGE013
The standard deviation of the C-phase current for each of the abrupt change data points,
Figure 157531DEST_PATH_IMAGE017
、
Figure 656645DEST_PATH_IMAGE018
、
Figure 408570DEST_PATH_IMAGE019
respectively on the x-th day
Figure 385753DEST_PATH_IMAGE013
Mutation of data point to
Figure 923045DEST_PATH_IMAGE007
Standard deviation of A-phase current of each mutation data point, day x
Figure 593060DEST_PATH_IMAGE013
Mutation of data point to
Figure 832281DEST_PATH_IMAGE007
Standard deviation of B-phase current of each mutation data point, day x
Figure 613155DEST_PATH_IMAGE013
From time to time
Figure 4953DEST_PATH_IMAGE007
C-phase current standard deviation of the individual mutation data points; and selecting an unbalanced treatment scheme based on the three-phase current standard deviation, the standard deviation, the lasting days and the difference mutation data points.
In a second aspect, the present invention provides a station area imbalance management apparatus based on a standard deviation degree, including: the first calculation module is configured to calculate the three-phase unbalance degree of each time every day based on the obtained three-phase current of a certain time period in the peak-facing summer or winter period of the previous annual distribution area; the judging module is configured to judge whether an unbalance out-of-limit event occurs at the x-th day t moment according to the three-phase unbalance and three-phase active power of a certain time period in the peak-facing summer or winter period of the previous annual distribution area; a second calculation module configured to, if an unbalance out-of-limit event occurs at the time of the xth day, classify the phase currents at the time of the xth day into a set
Figure 845870DEST_PATH_IMAGE001
And calculating said set
Figure 572387DEST_PATH_IMAGE001
The standard deviation of the three-phase current at each moment and the deviation of the standard deviation before and after the sudden change data point, wherein the three-phase currentThe calculated expression for the standard deviation is:
Figure 156952DEST_PATH_IMAGE002
in the formula (I), the compound is shown in the specification,
Figure 403256DEST_PATH_IMAGE003
respectively as the standard deviation of phase A current, the standard deviation of phase B current and the standard deviation of phase C current on the x-th day,
Figure 415075DEST_PATH_IMAGE004
、
Figure 363308DEST_PATH_IMAGE005
、
Figure 751564DEST_PATH_IMAGE006
the average value of the phase A current on the x-th day, the average value of the phase B current on the x-th day and the average value of the phase C current on the x-th day are respectively,
Figure 852375DEST_PATH_IMAGE007
as set on day x
Figure 300674DEST_PATH_IMAGE001
The number of elements contained in (a) is,
Figure 7642DEST_PATH_IMAGE008
、
Figure 934010DEST_PATH_IMAGE009
、
Figure 889327DEST_PATH_IMAGE010
phase A current, phase B current and phase C current at the ith moment of the x day respectively; the calculation expression of the standard deviation degree before and after the mutation data point is as follows:
Figure 508528DEST_PATH_IMAGE011
in the formula (I), the compound is shown in the specification,
Figure 431353DEST_PATH_IMAGE012
mutation data points on day x, respectively
Figure 895833DEST_PATH_IMAGE013
The standard deviation degree of the front and back A-phase current, the standard deviation degree of the B-phase current and the standard deviation degree of the C-phase current,
Figure 971236DEST_PATH_IMAGE007
as set on day x
Figure 761337DEST_PATH_IMAGE001
The number of mutation data points contained in (a),
Figure 905880DEST_PATH_IMAGE014
、
Figure 439629DEST_PATH_IMAGE015
、
Figure 369539DEST_PATH_IMAGE016
the 1 st to the 1 st mutation data points on the x-th day
Figure 64963DEST_PATH_IMAGE013
Standard deviation of A-phase current of each mutation data point, 1 st mutation data point to the x th mutation data point on x th day
Figure 962380DEST_PATH_IMAGE013
Standard deviation of B-phase current of each mutation data point, 1 st mutation data point to the x th mutation data point on the x th day
Figure 34242DEST_PATH_IMAGE013
The standard deviation of the C-phase current for each of the abrupt change data points,
Figure 818658DEST_PATH_IMAGE017
、
Figure 950562DEST_PATH_IMAGE018
、
Figure 69697DEST_PATH_IMAGE019
are respectively asDay x
Figure 945249DEST_PATH_IMAGE013
Mutation of data point to
Figure 849751DEST_PATH_IMAGE007
Standard deviation of A-phase current of each mutation data point, day x
Figure 886977DEST_PATH_IMAGE013
Mutation of data point to
Figure 24566DEST_PATH_IMAGE007
Standard deviation of B-phase current of each mutation data point, day x
Figure 313596DEST_PATH_IMAGE013
From time to time
Figure 197239DEST_PATH_IMAGE007
C-phase current standard deviation of the individual mutation data points; a selection module configured to select an imbalance treatment plan based on the three-phase current standard deviation, the standard deviation, the duration days, and the delta mutation data points.
In a third aspect, an electronic device is provided, comprising: the system comprises at least one processor and a memory which is in communication connection with the at least one processor, wherein the memory stores instructions which can be executed by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor can execute the steps of the station area unbalance treatment method based on the standard deviation degree of any embodiment of the invention.
In a fourth aspect, the present invention also provides a computer program product comprising a computer program stored on a non-volatile computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, cause the computer to perform the steps of the standard deviation based station area imbalance management method according to any one of the embodiments of the present invention.
According to the method and the device for treating the unbalance of the transformer area based on the standard deviation degree, the unbalance of three-phase currents at each moment is calculated based on the collected data, and a set is calculated
Figure 530000DEST_PATH_IMAGE020
And the three-phase current standard deviation and the standard deviation degree at each moment are selected based on the optimal treatment scheme, so that the three-phase imbalance of the transformer area can be accurately and effectively treated, the operation is easy, and the practicability is high.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flowchart of a method for managing an imbalance of a distribution room based on a standard deviation according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for treating an imbalance of a distribution room based on a standard deviation according to an embodiment of the present invention;
FIG. 3 is a graph of a three-phase current curve for 10kV Taketom port line for 3 months and 17 days according to an embodiment of the present invention;
fig. 4 is a three-phase current graph of 10kV911 masa line, pin 01, official change for 3 months and 2 days according to an embodiment of the present invention;
fig. 5 is a three-phase current curve diagram of 10kV916 catalpa line catalpa village sentry board brain changes for 3 months and 15 days according to an embodiment of the present invention;
fig. 6 is a block diagram of a structure of a station area imbalance management apparatus based on a standard deviation degree according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flow chart of a method for treating an imbalance of a distribution room based on a standard deviation according to the present application is shown.
As shown in fig. 1, in S101, based on the obtained three-phase currents in the time period T, a three-phase imbalance degree at each time every day in the certain time period is calculated;
in S102, judging whether an unbalance out-of-limit event occurs at the x-th day T moment according to the three-phase unbalance and the three-phase active power in the time period T;
in S103, if the unbalance out-of-limit event occurs at the x-th day t, the phase currents at the x-th day t are collected into a set
Figure 764672DEST_PATH_IMAGE001
And calculating said set
Figure 591814DEST_PATH_IMAGE001
The standard deviation of the three-phase current at each moment and the standard deviation degree before and after the mutation data point;
in S104, an imbalance treatment scheme is selected based on the three-phase current standard deviation, the standard deviation, the duration days and the delta mutation data points.
The method comprises the steps of firstly obtaining three-phase current and three-phase active power in a time period T, calculating three-phase unbalance degrees of each time every day, then judging whether an unbalance out-of-limit event occurs at the time T or not according to the three-phase current unbalance degrees and the three-phase active power, and if the unbalance out-of-limit event occurs, classifying each phase current at the time T of the x-th day into a set
Figure 595542DEST_PATH_IMAGE001
And calculate a set
Figure 364784DEST_PATH_IMAGE001
And finally, selecting an unbalanced treatment scheme according to the three-phase current standard deviation and the three-phase current standard deviation degree, the lasting days and the mutation data points, so that the optimal treatment scheme can be quickly, accurately and effectively selected by calculating the standard deviation degree, the purpose of three-phase balance of the low-voltage distribution network is realized, and a reference basis is provided for selecting the unbalanced treatment scheme.
Referring to fig. 2, a flowchart of a method for treating an imbalance of a distribution room based on a standard deviation degree according to an embodiment of the present application is shown.
As shown in fig. 2, a method for treating an imbalance of a distribution room based on a standard deviation degree specifically includes the following steps:
the method comprises the following steps: acquiring three-phase current and three-phase active power of one month in the peak-facing summer or winter period of the transformer area in the last year, and calculating three-phase unbalance degree at each moment every day;
step two: judging whether an unbalanced out-of-limit event occurs at the moment t or not through the three-phase current unbalance degree and the three-phase active power, and if so, classifying the currents of all the phases at the moment t into a set
Figure 821173DEST_PATH_IMAGE001
；
Step three: computing collections
Figure 452005DEST_PATH_IMAGE001
Standard deviation of three-phase current at each moment and standard deviation before and after mutation data points;
step four: if it is
Figure 310240DEST_PATH_IMAGE021
In the middle of the total number of the components is two or more than two
Figure 244524DEST_PATH_IMAGE022
（
Figure 922630DEST_PATH_IMAGE022
The standard deviation threshold value of the three-phase current) is adopted, and the days of the situation account for more than 20 days of one month in the period of meeting peak summer or winter, which shows that the three-phase current curves in the region have consistent fluctuation rules and are suitable for treatment by adopting manual phase change.
Step five: if it is
Figure 357153DEST_PATH_IMAGE023
In the middle of the table, two or more than two
Figure 69894DEST_PATH_IMAGE022
At the mutation data point
Figure 915359DEST_PATH_IMAGE013
Front and back satisfy
Figure 346341DEST_PATH_IMAGE024
Two or more than two of the total number of the particles are less than
Figure 584555DEST_PATH_IMAGE025
（
Figure 151803DEST_PATH_IMAGE025
A three-phase current standard deviation degree threshold value,
Figure 433748DEST_PATH_IMAGE022
≠
Figure 86447DEST_PATH_IMAGE025
) Mutation data points
Figure 862773DEST_PATH_IMAGE013
，
Figure 550106DEST_PATH_IMAGE026
Wherein, in the step (A),
Figure 2953DEST_PATH_IMAGE027
、
Figure 142947DEST_PATH_IMAGE028
are all relevant parameters of the value range of the mutation data points,
Figure 457385DEST_PATH_IMAGE029
the number of elements contained in the set A (x) of the x-th day and the number of days of the situation account for more than 20 days of one month in the period of summer or winter of meeting the peak, which shows that the three-phase current curve of the region shows sectional fluctuation and has the characteristic of short-time continuous interleaving, and an automatic phase modulation device is selected for treatment;
step six: and if the requirement is not met, selecting an additional compensation device for treatment.
Wherein, the unbalance degree of the three-phase current is realized at the x-th day t in the step one
Figure 999225DEST_PATH_IMAGE030
The calculation method comprises the following steps:
Figure 622973DEST_PATH_IMAGE031
in the formula (I), the compound is shown in the specification,
Figure 250264DEST_PATH_IMAGE030
the unbalance degree of the three-phase current is obtained,
Figure 368392DEST_PATH_IMAGE032
、
Figure 30318DEST_PATH_IMAGE033
and
Figure 824967DEST_PATH_IMAGE034
phase A current, phase B current and phase C current are respectively at the time t of the x-th day.
Wherein, the judging method in the second step is as follows:
if the data at the time t meet the following two conditionsDetermining that the mutation data point can be classified into a set
Figure 673975DEST_PATH_IMAGE001
. The conditions were as follows:
1）
Figure 861373DEST_PATH_IMAGE035
；
in the formula (I), the compound is shown in the specification,
Figure 502439DEST_PATH_IMAGE036
the unbalance degree of the three-phase current is obtained,
Figure 343356DEST_PATH_IMAGE037
the threshold value of the unbalance degree of the three-phase current is set;
2）
Figure 555026DEST_PATH_IMAGE038
or
Figure 139591DEST_PATH_IMAGE039
；
In the formula (I), the compound is shown in the specification,
Figure 635163DEST_PATH_IMAGE040
at the time of day x
Figure 646982DEST_PATH_IMAGE041
The active power of the phase(s),
Figure 611527DEST_PATH_IMAGE041
is one of phase A, phase B and phase C,
Figure 734203DEST_PATH_IMAGE042
is a single-phase load rate threshold of the distribution transformer,
Figure 355721DEST_PATH_IMAGE043
rated capacity of distribution transformer for transformer area;
Figure 538440DEST_PATH_IMAGE044
respectively the active power of phase A, the active power of phase B and the active power of phase C at the time t of the x day,
Figure 724702DEST_PATH_IMAGE045
is the three-phase total load rate threshold value of the distribution transformer.
The method for calculating the standard deviation of the three-phase current in the third step comprises the following steps:
Figure 651070DEST_PATH_IMAGE002
in the formula (I), the compound is shown in the specification,
Figure 121234DEST_PATH_IMAGE003
respectively as the standard deviation of phase A current, the standard deviation of phase B current and the standard deviation of phase C current on the x-th day,
Figure 474855DEST_PATH_IMAGE004
、
Figure 148413DEST_PATH_IMAGE005
、
Figure 878472DEST_PATH_IMAGE006
the average value of the phase A current on the x-th day, the average value of the phase B current on the x-th day and the average value of the phase C current on the x-th day are respectively,
Figure 203143DEST_PATH_IMAGE007
as set on day x
Figure 727665DEST_PATH_IMAGE001
The number of elements contained in (a) is,
Figure 888519DEST_PATH_IMAGE008
、
Figure 422269DEST_PATH_IMAGE009
、
Figure 601446DEST_PATH_IMAGE010
phase A current, phase B current and phase C current at the ith moment of the x day respectively;
the calculation expression of the standard deviation degree before and after the mutation data point is as follows:
Figure 296870DEST_PATH_IMAGE011
in the formula (I), the compound is shown in the specification,
Figure 945020DEST_PATH_IMAGE012
mutation data points on day x, respectively
Figure 16881DEST_PATH_IMAGE013
The standard deviation degree of the front and back A-phase current, the standard deviation degree of the B-phase current and the standard deviation degree of the C-phase current,
Figure 50565DEST_PATH_IMAGE007
as set on day x
Figure 182469DEST_PATH_IMAGE001
The number of mutation data points contained in (a),
Figure 52336DEST_PATH_IMAGE014
、
Figure 927888DEST_PATH_IMAGE015
、
Figure 816079DEST_PATH_IMAGE016
the 1 st to the 1 st mutation data points on the x-th day
Figure 118884DEST_PATH_IMAGE013
Standard deviation of A-phase current of each mutation data point, 1 st mutation data point to the x th mutation data point on x th day
Figure 741626DEST_PATH_IMAGE013
Standard deviation of B-phase current of each mutation data point, 1 st mutation data point to the x th mutation data point on the x th day
Figure 889711DEST_PATH_IMAGE013
The standard deviation of the C-phase current for each of the abrupt change data points,
Figure 897987DEST_PATH_IMAGE017
、
Figure 371694DEST_PATH_IMAGE018
、
Figure 216153DEST_PATH_IMAGE019
respectively on the x-th day
Figure 699087DEST_PATH_IMAGE013
Mutation of data point to
Figure 561870DEST_PATH_IMAGE007
Standard deviation of A-phase current of each mutation data point, day x
Figure 206478DEST_PATH_IMAGE013
Mutation of data point to
Figure 538233DEST_PATH_IMAGE007
Standard deviation of B-phase current of each mutation data point, day x
Figure 293699DEST_PATH_IMAGE013
From time to time
Figure 294146DEST_PATH_IMAGE007
Standard deviation of C-phase current for each abrupt data point.
The application takes 10kV Huang reclaiming stone portline, 10kV911 Marsha line Yangong No. 01 public transform and 10kV916 Huacatalpine catalpine mountain village sentry brain public transform as examples to verify the correctness and the effectiveness of the method provided by the application. The method comprises the following specific steps:
Figure 844076DEST_PATH_IMAGE046
Figure 663127DEST_PATH_IMAGE047
Figure 222285DEST_PATH_IMAGE048
as can be seen from Table 3, the standard deviations of the three-phase currents are respectively 14.8%, 11.5% and 12.2%, and the standard deviations are all larger than 8%, so that the possibility that the transformer area is treated by adopting artificial phase modulation is eliminated. Because 25 counting points are counted after data are removed in 17 days in 3 months, the station area can be divided into 13 according to the selection principle of mutation data points: 00 and 13: 30 two cases. When the mutation data point is 13: at 00, the degree of standard deviation is 25%, 58.77%, 68.81%, two of which are greater than 50%; when the mutation data point is 13: at 30, the degree of standard deviation was 23.4%, 84.44%, 71.24%, two of which were greater than 50%. In addition, the number of days that the platform appeared for 3 months was counted and was 26 days in total. In conjunction with the selection method presented herein, additional compensation devices should be employed for remediation. With reference to fig. 3, it can be observed that the three-phase current curve fluctuation characteristics of the distribution area meet the selection result requirements in days 3 and 17.
Figure 59659DEST_PATH_IMAGE049
Figure 46070DEST_PATH_IMAGE050
As can be seen from Table 5, the standard deviation degrees are respectively 15.72%, 24.85% and 7.34%, wherein the standard deviation degrees are more than 8%, so that the possibility of treatment by adopting artificial phase modulation in the region is eliminated. According to the mutation data point selection principle, setting the 3 month and 2 day mutation data points of the platform area as 16: 00, standard deviation degrees before and after mutation data points are 25.31%, 32.6%, 95.93%, and two of them are less than 50%. In addition, the number of days that the platform appeared for 3 months was counted and was 23 days in total. In combination with the selection method proposed herein, an automatic commutation device should be employed for remediation. With reference to fig. 4, it can be observed that the three-phase current curve fluctuation characteristics of the distribution area meet the selection result requirements in 3 months and 2 days.
Figure 86838DEST_PATH_IMAGE051
Figure 184107DEST_PATH_IMAGE052
As can be seen from Table 7, the standard deviation of the plateau at day 3 and day 15 was 4.14%, 13.96% and 6.02%, respectively, with both being less than 8%, and the plateau was found to be 23 days in total at month 3. In combination with the selection method presented herein, it can be judged that the block is suitable for remediation using artificial phase modulation. And as can be observed by combining the graph 5, the fluctuation characteristic of the three-phase current curve of the platform region can be observed to meet the requirement of the selection result within 3 months and 15 days.
Referring to fig. 6, a block diagram of a device for treating an imbalance of a distribution room based on a standard deviation degree according to an embodiment of the present invention is shown.
As shown in fig. 6, the device 200 for treating the imbalance of the transformer area includes a first calculating module 210, a determining module 220, a second calculating module 230, and a selecting module 240.
The first calculating module 210 is configured to calculate three-phase imbalance degrees at each moment every day based on the obtained three-phase currents in the time period T; the judging module 220 is configured to judge whether an unbalance out-of-limit event occurs at the xth day T moment according to the three-phase unbalance and the three-phase active power in the time period T; a second calculating module 230 configured to, if an unbalance out-of-limit event occurs at the time of the xth day, classify the phase currents at the time of the xth day into a set
Figure 141568DEST_PATH_IMAGE001
And calculating said set
Figure 298880DEST_PATH_IMAGE001
The standard deviation of the three-phase current at each moment and the standard deviation degree before and after the mutation data point; the selection module 240 is used to select the module,and the method is configured to select an imbalance treatment scheme based on the three-phase current standard deviation, the standard deviation, the duration days and the difference mutation data points.
It should be understood that the modules recited in fig. 6 correspond to various steps in the method described with reference to fig. 1. Thus, the operations and features described above for the method and the corresponding technical effects are also applicable to the modules in fig. 6, and are not described again here.
In other embodiments, an embodiment of the present invention further provides a non-volatile computer storage medium, where the computer storage medium stores computer-executable instructions, and the computer-executable instructions may execute the method for treating the imbalance of the transformer area in any of the above method embodiments;
as one embodiment, a non-volatile computer storage medium of the present invention stores computer-executable instructions configured to:
calculating three-phase unbalance degrees of each moment every day in a certain time period based on the obtained three-phase current in the time period T;
judging whether an unbalance out-of-limit event occurs at the x-th day T moment or not according to the three-phase unbalance and the three-phase active power in the time period T;
if an unbalanced out-of-limit event occurs at the time t of the x day, classifying the phase currents at the time t of the x day into a set
Figure 92523DEST_PATH_IMAGE001
And calculating said set
Figure 118117DEST_PATH_IMAGE001
The standard deviation of the three-phase current at each moment and the standard deviation degree before and after the mutation data point;
and selecting an unbalanced treatment scheme based on the three-phase current standard deviation, the standard deviation, the lasting days and the difference mutation data points.
The non-volatile computer-readable storage medium may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the station area unbalance management apparatus, and the like. Further, the non-volatile computer-readable storage medium may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the non-transitory computer readable storage medium optionally includes memory remotely located from the processor, and these remote memories may be connected to the station area imbalance abatement device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
An embodiment of the present invention further provides a computer program product, where the computer program product includes a computer program stored on a non-volatile computer-readable storage medium, and the computer program includes program instructions, and when the program instructions are executed by a computer, the computer executes any one of the above-mentioned station area imbalance management methods.
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 7, the electronic device includes: one or more processors 310 and a memory 320, with one processor 310 being illustrated in fig. 7. The electronic device may further include: an input device 330 and an output device 340. The processor 310, the memory 320, the input device 330, and the output device 340 may be connected by a bus or other means, as exemplified by the bus connection in fig. 7. The memory 320 is a non-volatile computer-readable storage medium as described above. The processor 310 executes various functional applications and data processing of the server by running the nonvolatile software programs, instructions and modules stored in the memory 320, so as to implement the station imbalance management method of the above-mentioned method embodiment. The input device 330 may receive input numeric or character information and generate key signal inputs related to user settings and function control of the station area unbalance management apparatus. The output device 340 may include a display device such as a display screen.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
As an embodiment, the electronic device is applied to a platform area imbalance abatement device, and is used for a client, and the electronic device includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to:
calculating three-phase unbalance degrees of each moment every day in a certain time period based on the obtained three-phase current in the time period T;
judging whether an unbalance out-of-limit event occurs at the x-th day T moment or not according to the three-phase unbalance and the three-phase active power in the time period T;
if an unbalanced out-of-limit event occurs at the time t of the x day, classifying the phase currents at the time t of the x day into a set
Figure 805450DEST_PATH_IMAGE001
And calculating said set
Figure 9030DEST_PATH_IMAGE001
The standard deviation of the three-phase current at each moment and the standard deviation degree before and after the mutation data point;
and selecting an unbalanced treatment scheme based on the three-phase current standard deviation, the standard deviation, the lasting days and the difference mutation data points.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (8)

1. A method for treating the unbalance of a distribution room based on standard deviation degree is characterized by comprising the following steps:
calculating three-phase unbalance degrees of each moment every day in the time period T based on the obtained three-phase current in the time period T;
judging whether an unbalance out-of-limit event occurs at the x-th day T moment or not according to the three-phase unbalance and the three-phase active power in the time period T;
if an unbalanced out-of-limit event occurs at the time t of the x day, classifying the phase currents at the time t of the x day into a set
Figure 893795DEST_PATH_IMAGE001
And calculating said set
Figure 342094DEST_PATH_IMAGE001
The standard deviation of the three-phase current at each moment and the standard deviation degree before and after the mutation data point are shown in the specification, wherein the calculation expression of the standard deviation of the three-phase current is as follows:
Figure 793935DEST_PATH_IMAGE002
in the formula (I), the compound is shown in the specification,
Figure 844937DEST_PATH_IMAGE003
respectively as the standard deviation of phase A current, the standard deviation of phase B current and the standard deviation of phase C current on the x-th day,
Figure 190467DEST_PATH_IMAGE004
、
Figure 419454DEST_PATH_IMAGE005
、
Figure 483225DEST_PATH_IMAGE006
the average value of the phase A current on the x-th day, the average value of the phase B current on the x-th day and the average value of the phase C current on the x-th day are respectively,
Figure 337918DEST_PATH_IMAGE007
as set on day x
Figure 537955DEST_PATH_IMAGE001
The number of elements contained in (a) is,
Figure 937843DEST_PATH_IMAGE008
、
Figure 223331DEST_PATH_IMAGE009
、
Figure 616135DEST_PATH_IMAGE010
phase A current, phase B current and phase C current at the ith moment of the x day respectively;
the calculation expression of the standard deviation degree before and after the mutation data point is as follows:
Figure 811624DEST_PATH_IMAGE011
in the formula (I), the compound is shown in the specification,
Figure 772627DEST_PATH_IMAGE012
mutation data points on day x, respectively
Figure 670045DEST_PATH_IMAGE013
The standard deviation degree of the front and back A-phase current, the standard deviation degree of the B-phase current and the standard deviation degree of the C-phase current,
Figure 476327DEST_PATH_IMAGE007
as set on day x
Figure 526323DEST_PATH_IMAGE001
The number of mutation data points contained in (a),
Figure 392647DEST_PATH_IMAGE014
、
Figure 777361DEST_PATH_IMAGE015
、
Figure 652913DEST_PATH_IMAGE016
the 1 st to the 1 st mutation data points on the x-th day
Figure 557415DEST_PATH_IMAGE013
Standard deviation of A-phase current of each mutation data point, 1 st mutation data point to the x th mutation data point on x th day
Figure 860221DEST_PATH_IMAGE013
Standard deviation of B-phase current of each mutation data point, 1 st mutation data point to the x th mutation data point on the x th day
Figure 466651DEST_PATH_IMAGE013
The standard deviation of the C-phase current for each of the abrupt change data points,
Figure 880315DEST_PATH_IMAGE017
、
Figure 639324DEST_PATH_IMAGE018
、
Figure 113031DEST_PATH_IMAGE019
respectively on the x-th day
Figure 206757DEST_PATH_IMAGE013
Mutation of data point to
Figure 158533DEST_PATH_IMAGE007
Standard deviation of A-phase current of each mutation data point, day x
Figure 37627DEST_PATH_IMAGE013
Mutation of data point to
Figure 682235DEST_PATH_IMAGE007
Standard deviation of B-phase current of each mutation data point, day x
Figure 534697DEST_PATH_IMAGE013
From time to time
Figure 165529DEST_PATH_IMAGE007
C-phase current standard deviation of the individual mutation data points;
and selecting an unbalanced treatment scheme based on the three-phase current standard deviation, the standard deviation, the lasting days and the difference mutation data points.
2. The method for treating the unbalance of the distribution room based on the standard deviation degree according to claim 1, wherein the calculation expression of the unbalance degree of the three-phase current is as follows:
Figure 758185DEST_PATH_IMAGE020
in the formula (I), the compound is shown in the specification,
Figure 698328DEST_PATH_IMAGE021
the unbalance degree of the three-phase current is obtained,
Figure 642013DEST_PATH_IMAGE022
、
Figure 342116DEST_PATH_IMAGE023
and
Figure 54857DEST_PATH_IMAGE024
phase A current, phase B current and phase C current are respectively at the time t of the x-th day.
3. The method for treating the imbalance of the distribution room based on the standard deviation degree of the distribution room according to claim 1, wherein the first condition triggered by the imbalance out-of-limit event is as follows:
Figure 900322DEST_PATH_IMAGE025
；
in the formula (I), the compound is shown in the specification,
Figure 331303DEST_PATH_IMAGE026
the unbalance degree of the three-phase current is obtained,
Figure 303938DEST_PATH_IMAGE027
the threshold value of the unbalance degree of the three-phase current is set;
the second condition triggered by the imbalance out-of-limit event is:
Figure 526978DEST_PATH_IMAGE028
or
Figure 418711DEST_PATH_IMAGE029
；
In the formula (I), the compound is shown in the specification,
Figure 212354DEST_PATH_IMAGE030
at the time of day x
Figure 113314DEST_PATH_IMAGE031
The active power of the phase(s),
Figure 659702DEST_PATH_IMAGE031
is one of phase A, phase B and phase C,
Figure 987915DEST_PATH_IMAGE032
is a single-phase load rate threshold of the distribution transformer,
Figure 3276DEST_PATH_IMAGE033
rated capacity of distribution transformer for transformer area;
Figure 707927DEST_PATH_IMAGE035
respectively the active power of phase A, the active power of phase B and the active power of phase C at the time t of the x day,
Figure 374400DEST_PATH_IMAGE036
is the three-phase total load rate threshold value of the distribution transformer.
4. The method for treating the imbalance of the distribution room based on the standard deviation degree of the three-phase current, according to claim 1, wherein the selecting the imbalance treatment scheme based on the standard deviation of the three-phase current, the standard deviation degree of the standard deviation, the continuous days and the difference mutation data points comprises:
if the standard deviation of the phase A current, the standard deviation of the phase B current and the standard deviation of the phase C current on the x-th day meet two or more than two
Figure 139094DEST_PATH_IMAGE037
And if the continuous days exceed the preset days threshold value, selecting a manual commutation control scheme, wherein,W 1and the standard deviation threshold value of the three-phase current is obtained.
5. The method for treating the imbalance of the distribution room based on the standard deviation degree of the three-phase current according to claim 1, wherein the selecting the imbalance treatment plan based on the standard deviation of the three-phase current, the standard deviation degree of the standard deviation, the continuous days and the difference mutation data points further comprises:
if the standard deviation of the phase A current, the standard deviation of the phase B current and the standard deviation of the phase C current on the x-th day meet two or more than two
Figure 641751DEST_PATH_IMAGE037
At the mutation data point
Figure 884513DEST_PATH_IMAGE038
Mutation data points before and after meeting x-th day
Figure 405493DEST_PATH_IMAGE013
The standard deviation degrees of the front and back A-phase currents, the standard deviation degree of the B-phase currents and the standard deviation degree of the C-phase currents are two or more than two less than
Figure 75509DEST_PATH_IMAGE039
And if the continuous days exceed the preset days threshold, selecting a governing scheme of the automatic phase modulation device, wherein,W 1is a three-phase current standard deviation threshold value,W 2is a three-phase current standard deviation degree threshold value,
Figure 65462DEST_PATH_IMAGE040
，
Figure 236549DEST_PATH_IMAGE041
、
Figure 752981DEST_PATH_IMAGE042
are all relevant parameters of the value range of the mutation data points,
Figure DEST_PATH_IMAGE043
the number of elements included in the set A (x) on day x.
6. The utility model provides a platform district unbalance management device based on standard deviation degree of deviation which characterized in that includes:
the first calculation module is configured to calculate three-phase unbalance degrees at each moment every day based on the obtained three-phase currents in the time period T;
the judging module is configured to judge whether an unbalance out-of-limit event occurs at the x-th day T moment according to the three-phase unbalance and the three-phase active power in the time period T;
a second calculation module configured to, if an unbalance out-of-limit event occurs at the time of the xth day, classify the phase currents at the time of the xth day into a set
Figure 266002DEST_PATH_IMAGE001
And calculating said set
Figure 986659DEST_PATH_IMAGE001
The standard deviation of the three-phase current at each moment and the standard deviation degree before and after the mutation data point are shown in the specification, wherein the calculation expression of the standard deviation of the three-phase current is as follows:
Figure 712169DEST_PATH_IMAGE002
in the formula (I), the compound is shown in the specification,
Figure 83108DEST_PATH_IMAGE003
respectively as the standard deviation of phase A current, the standard deviation of phase B current and the standard deviation of phase C current on the x-th day,
Figure 219560DEST_PATH_IMAGE004
、
Figure 308739DEST_PATH_IMAGE005
、
Figure 572361DEST_PATH_IMAGE006
the average value of the phase A current on the x-th day, the average value of the phase B current on the x-th day and the average value of the phase C current on the x-th day are respectively,
Figure 797806DEST_PATH_IMAGE007
as set on day x
Figure 370739DEST_PATH_IMAGE001
The number of elements contained in (a) is,
Figure 822580DEST_PATH_IMAGE008
、
Figure 14527DEST_PATH_IMAGE009
、
Figure 219112DEST_PATH_IMAGE010
phase A current, phase B current and phase C current at the ith moment of the x day respectively;
the calculation expression of the standard deviation degree before and after the mutation data point is as follows:
Figure 838312DEST_PATH_IMAGE011
in the formula (I), the compound is shown in the specification,
Figure 511870DEST_PATH_IMAGE012
mutation data points on day x, respectively
Figure 632142DEST_PATH_IMAGE013
The standard deviation degree of the front and back A-phase current, the standard deviation degree of the B-phase current and the standard deviation degree of the C-phase current,
Figure 566600DEST_PATH_IMAGE007
as set on day x
Figure 232067DEST_PATH_IMAGE001
The number of mutation data points contained in (a),
Figure 517555DEST_PATH_IMAGE014
、
Figure 175938DEST_PATH_IMAGE015
、
Figure 230482DEST_PATH_IMAGE016
the 1 st to the 1 st mutation data points on the x-th day
Figure 332430DEST_PATH_IMAGE013
Standard deviation of A-phase current of each mutation data point, 1 st mutation data point to the x th mutation data point on x th day
Figure 964269DEST_PATH_IMAGE013
Standard deviation of B-phase current of each mutation data point, 1 st mutation data point to the x th mutation data point on the x th day
Figure 36130DEST_PATH_IMAGE013
The standard deviation of the C-phase current for each of the abrupt change data points,
Figure 86126DEST_PATH_IMAGE017
、
Figure 218030DEST_PATH_IMAGE018
、
Figure 602743DEST_PATH_IMAGE019
respectively on the x-th day
Figure 212716DEST_PATH_IMAGE013
Mutation of data point to
Figure 117218DEST_PATH_IMAGE007
Standard deviation of A-phase current of each mutation data point, day x
Figure 550517DEST_PATH_IMAGE013
Each protrusionVariable data point to
Figure 297893DEST_PATH_IMAGE007
Standard deviation of B-phase current of each mutation data point, day x
Figure 586923DEST_PATH_IMAGE013
From time to time
Figure 470565DEST_PATH_IMAGE007
C-phase current standard deviation of the individual mutation data points;
a selection module configured to select an imbalance treatment plan based on the three-phase current standard deviation, the standard deviation, the duration days, and the delta mutation data points.
7. An electronic device, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any of claims 1 to 5.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method of any one of claims 1 to 5.
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