CN115021278A - Switching strategy optimization method for multiple groups of switching reactive power compensation devices of 220kV transformer substation - Google Patents

Switching strategy optimization method for multiple groups of switching reactive power compensation devices of 220kV transformer substation Download PDF

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CN115021278A
CN115021278A CN202210794401.3A CN202210794401A CN115021278A CN 115021278 A CN115021278 A CN 115021278A CN 202210794401 A CN202210794401 A CN 202210794401A CN 115021278 A CN115021278 A CN 115021278A
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switching
transformer
power factor
reactive
compensation devices
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CN115021278B (en
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徐志伟
吴星仪
叶海
郭冰
孙应春
居尚
虞悦
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Yangzhou Power Supply Branch Of State Grid Jiangsu Electric Power Co ltd
Yangzhou Haochen Power Design Co ltd
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Yangzhou Power Supply Branch Of State Grid Jiangsu Electric Power Co ltd
Yangzhou Haochen Power Design 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/70—Regulating power factor; Regulating reactive current or power
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • 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
    • Y02E40/30—Reactive power compensation

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Abstract

The switching strategy optimization method for multiple groups of switching reactive power compensation devices of the 220kV transformer substation comprises the following steps: collecting data, and collecting substation data; inputting data, inputting a time interval to be optimized, transformer power of each time point and the like; power factor analysis, namely calculating substation data according to a power factor analysis model and judging whether the substation power factor at the time point needing to be optimized is qualified or not; calculating a switching scheme, namely calculating the unqualified power factor time point by adopting a switching model to obtain a simulated switching scheme and adding the simulated switching scheme to a simulated switching scheme library; optimizing a switching scheme, and substituting unqualified power factor time point data into the power factor judgment model in sequence for the simulated switching scheme in the simulated switching scheme library to calculate to obtain the simulated switching scheme with the maximum qualified times. According to the invention, the power factor qualification rate of the 220kV transformer substation is improved, the switching times of the grouped reactive compensation devices are reduced, the single group of reactive compensation devices are switched in a balanced manner, and the service life of the compensation devices is prolonged.

Description

Switching strategy optimization method for multiple groups of switching reactive power compensation devices of 220kV transformer substation
Technical Field
The invention relates to the field of reactive power compensation devices, in particular to a switching strategy optimization method for multiple groups of switching reactive power compensation devices of a 220kV transformer substation.
Background
The conventional fixed-capacity reactive power compensation device configured in the 220kV transformer substation has the problems that a capacitor is over-compensated and is not under-compensated during operation, so that the problems of large fluctuation of the main transformer power factor, poor compensation effect and the like are caused. The multiple groups of switching reactive compensation devices divide the whole group of reactive compensation devices into a plurality of independent groups, independent group compensation can be realized according to actual operation requirements, the fine compensation effect of the reactive compensation devices is effectively exerted, and the problem of large power factor fluctuation of the transformer substation is solved, so that the switching reactive compensation devices are gradually applied to reactive compensation of the transformer substation.
For a long time, the switching method of conventional reactive compensation is still adopted for the multiple groups of switching reactive compensation devices of the 220kV transformer substation: manual control and automatic voltage control.
The manual control method is characterized in that an operator monitors a certain 220kV transformer substation in a certain area, and a computer load prediction system is used for switching the reactive power compensation device according to experience judgment, and when the manual control method is applied to a plurality of groups of switched reactive power compensation devices, the following problems exist: the switching effect is poor; the manual regulation often lags behind the dynamic change of the system tide, so that the reactive compensation is not matched with the actual demand, and the power factor of the transformer substation is out of limit. Secondly, the manual workload is large; a plurality of single-group reactive compensation devices are arranged in the multi-group switching reactive compensation devices, the switching workload is multiple times of that of the conventional reactive compensation devices, and the workload of operation and maintenance personnel is greatly increased. The switching times are more; when the reactive power changes rapidly, manual switching easily causes more switching times of the single group of reactive power compensation devices, so that the service life of the reactive power compensation devices is shortened.
The automatic voltage control method aims at the voltage or power factor optimization of a 220kV transformer substation, and when the reactive compensation device is applied to a plurality of groups of switching reactive compensation devices, the following problems exist: firstly, frequent switching is carried out; because the automatic voltage control method has fixed upper and lower limits of the control strategy criterion, when real-time operation data randomly fluctuates near the upper and lower limits of the criterion, the single-group reactive compensation device is frequently switched. Unbalanced switching; when the switching is performed by an automatic voltage control method, the switching times of the single group of reactive compensation devices are greatly different, so that the switching switches with more switching times are damaged, and the switching switches with less switching times are subjected to switch jam because the switching switches do not act for a long time. The compensation effect is not good; when the device is applied to multiple groups of switching reactive power compensation devices, the compensation of the multiple groups of switching reactive power compensation devices of the 220kV transformer substation is not fine enough, the over-compensation or under-compensation condition of the transformer substation is often caused, and the electric energy quality of the 220kV transformer substation is unqualified.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a switching strategy optimization method for multiple groups of switching reactive power compensation devices of a 220kV transformer substation, which can improve the power factor qualification rate of the 220kV transformer substation, ensure the switching times of the grouped reactive power compensation devices in a selected time interval to be minimum and realize balanced switching.
The technical scheme of the invention is as follows: the method comprises the following steps:
s1, collecting substation data: the method comprises the steps of obtaining 220kV transformer operation data, 220kV transformer parameters and the capacity, the number and the operation condition of a plurality of groups of switching reactive compensation devices;
s2, input data: inputting a time interval to be optimized, the transformer power of each time point and the operation condition of a plurality of groups of switching reactive power compensation devices at the initial time point;
s3, power factor analysis: calculating substation data according to the power factor analysis model, and judging whether the substation power factor at the time point needing to be optimized is qualified;
s4, calculating a switching scheme: calculating the unqualified power factor time point by using a switching model to obtain a quasi-switching scheme and adding the quasi-switching scheme to a quasi-switching scheme library;
s5, optimizing the switching scheme: according to the quasi-switching scheme in the quasi-switching scheme library, sequentially substituting unqualified power factor time point data into a power factor judgment model for calculation to obtain the quasi-switching scheme with the maximum qualified times;
and outputting an optimized switching scheme according to the simulated switching scheme with the maximum qualified times based on the switching priority order.
Step S3 includes the following steps:
step S31: setting the initial time point in the time interval to be optimized as t equal to 1, substituting the substation data corresponding to different time points t into the power factor analysis model for calculation, if the calculation result is unqualified, turning to the step S33, and if the calculation result is qualified, turning to the step S32;
step S32: setting the total number of the time points of the transformer substation to be optimized as T, and if T is less than T, turning to step S31; otherwise, go to step S5;
step S33: and numbering the unqualified power factor time points in sequence, wherein the number of the first unqualified power factor time point is n-1.
Step S4 includes the following steps:
step S41: calculating the unqualified power factor time point data by using a switching model to obtain a quasi switching scheme and adding the quasi switching scheme to a quasi switching scheme library;
if the switching scheme obtained by calculation is consistent with the existing switching scheme in the quasi-switching scheme library, the switching scheme is not added to the quasi-switching scheme library;
step S42: and when n is n +1, substituting all switching schemes in the simulated switching scheme library and the substation data corresponding to the serial number n into the power factor judgment model for calculation, if the calculation results are unqualified, switching to the step S41, and if the calculation results of 1 or more simulated switching schemes are qualified, switching to the step S32.
Step S5 includes the following steps:
step S51: for each unqualified power factor time point, calculating the quasi-switching schemes in the quasi-switching scheme library in sequence based on the power factor judgment model, judging whether the power factor of each unqualified power factor time point is qualified after different quasi-switching schemes are adopted, and recording the qualified times of each quasi-switching scheme;
step S52: and switching the single group of reactive compensation devices according to the simulated switching scheme with the maximum qualified times based on the switching priority order, and outputting an optimized switching scheme.
In the step S3, in the step S,
the power factor analysis model is as follows:
when the temperature is higher than the set temperature
Figure BDA0003735101860000031
If Q is more than 0 and less than 0.3287P, judging the power factor to be qualified, otherwise, judging the power factor to be unqualified;
when in use
Figure BDA0003735101860000032
If Q is more than 0.3287P, judging the power factor to be qualified, otherwise, judging the power factor to be unqualified;
in the formula: s e The capacity of the high-voltage side of the transformer; p is the active value of the high-voltage side of the transformer; q is the reactive value of the high-voltage side of the transformer.
In the step S4, in the step S,
the switching model is divided into a peak load switching model and a valley load switching model;
when in use
Figure BDA0003735101860000033
Adopting a peak load switching model:
0＜QS e -Q c S e +I 0 ％+U d1 ％(P 2 +(Q-Q c ) 2 )+U d2 ％(P 1 2 +Q 1 2 )+U d3 ％(P 2 2 +(Q 2 -Q c ) 2 )＜0.3287PS e (1)
Q c ≤Q c ′ (2)
0＜QS e +Q d S e +I 0 ％+U d1 ％(P 2 +(Q+Q d ) 2 )+U d2 ％(P 1 2 +Q 1 2 )+U d3 ％(P 2 2 +(Q 2 +Q d ) 2 )＜0.3287PS e (3)
Q d ≤Q d ′ (4)
when in use
Figure BDA0003735101860000034
Adopting a valley load switching model:
QS e +Q d S e +I 0 ％+U d1 ％(P 2 +(Q+Q d ) 2 )+U d2 ％(P 1 2 +Q 1 2 )+U d3 ％(P 2 2 +(Q 2 +Q d ) 2 )＞0.3287PS e (5)
Q d ≤Q d ′ (6)
in the formula: s e The capacity of the high-voltage side of the transformer; p is the active value of the high-voltage side of the transformer; q is the reactive value of the high-voltage side of the transformer; p 1 The value is the active value of the medium voltage side of the transformer; q 1 The value is the reactive value of the medium-voltage side of the transformer; p 2 The value is the active value of the low-voltage side of the transformer; q 2 The value is the reactive value of the low-voltage side of the transformer; q c The sum of the capacities of a single group of reactive compensation devices is planned to be input; q c ' is the total capacity of a single group of reactive power compensation devices which are not put into operation; q d The sum of the capacities of a single group of reactive power compensation devices is to be cut; q d ' is the total capacity of a single group of reactive power compensation devices which are put into operation; u shape d1 % is the voltage percentage of the high-voltage impedance of the transformer; u shape d2 % is the voltage percentage of the medium voltage impedance of the transformer; u shape d3 % is the voltage percentage of the low-voltage impedance of the transformer; i is 0 % is percent no-load current.
In the step S5, in the step S,
the power factor judgment model is as follows:
when in use
Figure BDA0003735101860000041
If satisfy
Figure BDA0003735101860000042
Or
Figure BDA0003735101860000043
Judging that the power factor is qualified, otherwise, judging that the power factor is unqualified; when in use
Figure BDA0003735101860000044
If satisfy
Figure BDA0003735101860000045
Judging that the power factor is qualified, otherwise, judging that the power factor is unqualified;
in the formula: s. the e The capacity of the high-voltage side of the transformer; p is the active value of the high-voltage side of the transformer; q is the reactive value of the high-voltage side of the transformer; q 2 The value is the reactive value of the low-voltage side of the transformer; q c The sum of the capacities of the single group of reactive power compensation devices is planned to be input; q d The sum of the capacities of a single group of reactive compensation devices is to be cut; u shape d1 % is the voltage percentage of the high-voltage impedance of the transformer; u shape d3 % is the voltage percentage of the low voltage impedance of the transformer.
In step S5, switching order priorities need to be set for the single group of reactive power compensation devices of the multiple groups of switching reactive power compensation devices, the single group of reactive power compensation devices that are switched earliest have the highest input priority, and the single group of reactive power compensation devices that are switched earliest have the highest cutting priority;
and after each switching of the single group of reactive compensation devices, the switching-in priority and the switching-off priority are reordered.
Capacity and Q of virtual single-group reactive power compensation device c In the sum of the capacity combinations of a single group of reactive power compensation devices not yet put into operationTaking values, preferably large capacity values which meet calculation conditions;
capacity and Q of single-group reactive power compensation device to be cut d And taking the sum of the capacity combination number of the single group of reactive compensation devices which are currently running, preferably selecting a smaller capacity value which meets the calculation condition.
During work, the power factor qualification rate of the 220kV transformer substation can be improved in a plurality of continuous time intervals, the switching times of the grouped reactive power compensation devices are reduced, the single group of reactive power compensation devices are switched in a balanced mode, the fault rate of the reactive power compensation devices is effectively reduced, and the service life of the compensation devices is prolonged.
According to the switching strategy optimization method, when the load change is fast, the shorter the selection time interval is, the finer the compensation of the multiple groups of switching reactive compensation devices is, the better the effect is, the power supply quality of the 220kV transformer substation is effectively improved, and the power grid loss is reduced.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings. As shown in fig. 1, the invention provides a switching strategy optimization method for multiple groups of switching reactive power compensation devices of a 220kV substation, which comprises the following steps:
s1, collecting data
Collecting 220kV transformer operation data, 220kV transformer parameters and the capacity, the number and the operation condition of a plurality of groups of switching reactive compensation devices;
s2, inputting data
And inputting a time interval to be optimized, the transformer power of each time point and the operation condition of a plurality of groups of switching reactive power compensation devices at the initial time point.
S3 power factor analysis
And calculating the data of the transformer substation according to the power factor analysis model, and judging whether the power factor of the transformer substation at the time point needing to be optimized is qualified. The power factor analysis model is:
when in use
Figure BDA0003735101860000051
If the Q is more than 0 and less than 0.3287P, the power factor is judged to be qualified, otherwise, the power factor is judged to be unqualified. When in use
Figure BDA0003735101860000052
If Q > 0.3287P is satisfied, the power factor is judged to be qualified, otherwise, the power factor is judged to be unqualified.
In the formula: s e The capacity of the high-voltage side of the transformer; p is the active value of the high-voltage side of the transformer; q is the reactive value of the high-voltage side of the transformer;
step S3 includes the following steps:
step S31: setting the initial time point in the time interval to be optimized as t equal to 1, substituting the substation data corresponding to different time points t into the power factor analysis model for calculation, if the calculation result is unqualified, turning to the step S33, and if the calculation result is qualified, turning to the step S32;
step S32: setting the total number of the time points of the transformer substation to be optimized as T, and if T is less than T, turning to step S31; otherwise, go to step S5 (i.e., step S51);
step S33: and numbering the unqualified power factor time points in sequence, wherein the number of the first unqualified power factor time point is n equal to 1.
S4, calculating a switching scheme
And calculating the unqualified power factor time point by using a switching model to obtain a simulated switching scheme and adding the simulated switching scheme to a simulated switching scheme library. The switching model is divided into a peak load switching model and a valley load switching model.
When in use
Figure BDA0003735101860000053
Adopting a peak load switching model:
0＜QS e -Q c S e +I 0 ％+U d1 ％(P 2 +(Q-Q c ) 2 )+U d2 ％(P 1 2 +Q 1 2 )+U d3 ％(P 2 2 +(Q 2 -Q c ) 2 )＜0.3287PS e (1)
Q c ≤Q c ′ (2)
0＜QS e +Q d S e +I 0 ％+U d1 ％(P 2 +(Q+Q d ) 2 )+U d2 ％(P 1 2 +Q 1 2 )+U d3 ％(P 2 2 +(Q 2 +Q d ) 2 )＜0.3287PS e (3)
Q d ≤Q d ′ (4)
when in use
Figure BDA0003735101860000054
Adopting a valley load switching model:
QS e +Q d S e +I 0 ％+U d1 ％(P 2 +(Q+Q d ) 2 )+U d2 ％(P 1 2 +Q 1 2 )+U d3 ％(P 2 2 +(Q 2 +Q d ) 2 )＞0.3287PS e (5)
Q d ≤Q d ′ (6)
in the formula: s e The capacity of the high-voltage side of the transformer; p is the active value of the high-voltage side of the transformer; q is the reactive value of the high-voltage side of the transformer; p is 1 The value is the active value of the medium-voltage side of the transformer; q 1 The value is the reactive value of the medium-voltage side of the transformer; p 2 The value is the active value of the low-voltage side of the transformer; q 2 The value is the reactive value of the low-voltage side of the transformer; q c The sum of the capacities of a single group of reactive compensation devices is planned to be input; q c ' is the total capacity of a single group of reactive power compensation devices which are not put into operation; q d The sum of the capacities of a single group of reactive compensation devices is to be cut; q d ' is the total capacity of a single group of reactive power compensation devices which are put into operation; u shape d1 % is the voltage percentage of the high-voltage impedance of the transformer; u shape d2 % is the voltage percentage of the medium voltage impedance of the transformer; u shape d3 % is the voltage percentage of the low-voltage impedance of the transformer; i is 0 % is percent no-load current.
Step S4 includes the following steps:
step S41: calculating the unqualified power factor time point data by using a switching model to obtain a quasi-switching scheme and adding the quasi-switching scheme to a quasi-switching scheme library;
if the switching scheme obtained by calculation is consistent with the existing switching scheme in the quasi-switching scheme library, the switching scheme is not added to the quasi-switching scheme library;
step S42: and when n is n +1, substituting all switching schemes in the simulated switching scheme library and the substation data corresponding to the serial number n into the power factor judgment model for calculation, if the calculation results are unqualified, switching to the step S41, and if the calculation results of 1 or more simulated switching schemes are qualified, switching to the step S32.
S5 optimizing switching scheme
And aiming at the quasi-switching scheme in the quasi-switching scheme library, sequentially substituting the unqualified power factor time point data into the power factor judgment model for calculation to obtain the quasi-switching scheme with the maximum qualified times. The single group of reactive compensation devices of the multiple groups of switching reactive compensation devices need to be set with switching sequence priority, the single group of reactive compensation devices which are switched earliest are switched to have the highest input priority, and the single group of reactive compensation devices which are switched earliest are switched to have the highest switching priority. And after each switching of the single group of reactive compensation devices, the switching-in priority and the switching-off priority are reordered. And switching the single group of reactive compensation devices according to the simulated switching scheme with the most qualified times based on the switching priority order, and outputting an optimized switching scheme. The power factor judgment model is as follows:
when the temperature is higher than the set temperature
Figure BDA0003735101860000061
If satisfy
Figure BDA0003735101860000062
Or
Figure BDA0003735101860000063
The power factor is judged to be qualified, otherwise, the power factor is judged to be unqualified.
When in use
Figure BDA0003735101860000064
If satisfy
Figure BDA0003735101860000065
The power factor is judged to be qualified, otherwise, the power factor is judged to be unqualified.
In the formula: s e The capacity of the high-voltage side of the transformer; p is the active value of the high-voltage side of the transformer; q is the reactive value of the high-voltage side of the transformer; q 2 The value is the reactive value of the low-voltage side of the transformer; q c The sum of the capacities of a single group of reactive compensation devices is planned to be input; q d The sum of the capacities of a single group of reactive compensation devices is to be cut; u shape d1 % is the voltage percentage of the high-voltage impedance of the transformer; u shape d3 % is the voltage percentage of the low voltage impedance of the transformer.
Step S5 includes the following steps:
step S51: for each unqualified power factor time point, calculating the quasi-switching schemes in the quasi-switching scheme library in sequence based on the power factor judgment model, judging whether the power factor of each unqualified power factor time point is qualified after different quasi-switching schemes are adopted, and recording the qualified times of each quasi-switching scheme;
step S52: and switching the single group of reactive compensation devices according to the simulated switching scheme with the maximum qualified times based on the switching priority order, and outputting an optimized switching scheme.
In steps S4 and S5, the capacity and Q of the single group of reactive power compensation device are planned to be input c Taking a value in the sum of the capacity combination numbers of the single group of reactive compensation devices which are not put into operation, and preferably selecting a larger capacity value which meets the calculation condition; capacity and Q of single-group reactive power compensation device to be cut d And taking the sum of the capacity combination number of the single group of reactive compensation devices which are currently running, preferably selecting a smaller capacity value which meets the calculation condition.
The calculation result of the peak load switching model is the capacity and Q of the single group of reactive power compensation devices to be put into c Or the capacity and Q of a single group of reactive power compensation devices to be cut d One kind of (1).
The implementation of the invention is further illustrated by the 220kV substation example.
(1) Collecting data
The method comprises the following steps of collecting 220kV transformer substation transformer parameters and the capacity and the number of a plurality of groups of switching reactive compensation devices: the number of the transformers is 1, and the capacity of the transformers is 180/180/90 MVA; high voltage impedance voltage percentage U of transformer d1 Percent is 13.5 percent; transformer medium voltage impedance voltage percentage U d2 Percent is-0.5 percent; low voltage impedance voltage percentage U of transformer d3 50.5 percent; percent no load current I 0 Percent is 0.04 percent, 4 sets of 6Mvar multi-group switching reactive compensation devices (the grouping mode is 1.2+1.2+1.2+1.2+1.2+1.2Mvar) are configured, and 5 single-group reactive compensation devices are arranged in each multi-group switching reactive compensation device. In addition, the operation data of the 220kV transformer are collected in real time.
(2) Inputting data
The time interval needing to be optimized is set by a user, the shorter the time interval needing to be optimized is, the more frequent the compensation switching of the multiple groups of switching reactive compensation devices is, the more precise the compensation is, and the better the effect is. In this embodiment, 10 typical operation data of a time interval to be optimized are selected for explanation, the operation data of the 220kV transformer is shown in table 1, and the operation conditions of the multiple groups of switching reactive power compensation devices at the initial time point are shown in table 2.
Meter 1220 kV transformer operation data
Figure BDA0003735101860000071
Figure BDA0003735101860000081
TABLE 2 initial time points for the operation of the multiple groups of switching reactive power compensation devices
Figure BDA0003735101860000082
Figure BDA0003735101860000091
(3) Power factor analysis
And calculating the substation data in the table 1 by adopting a power factor analysis model, and judging whether the substation power factor at the time point needing to be optimized is qualified. The unqualified power factor time points are numbered in sequence, the number n of the first unqualified power factor time point is 1, and the power factor analysis result is shown in table 3.
TABLE 3 Power factor analysis results
Figure BDA0003735101860000092
Figure BDA0003735101860000101
(4) Switching scheme calculation
And (4) calculating a switching scheme, namely firstly calculating the unqualified power factor time point in the table 3 by using a switching model, wherein the calculation result is shown in the table 4. And then adding the virtual switching scheme in the table 4 to a virtual switching scheme library, wherein the virtual switching scheme library is shown in a table 5.
Table 4 calculation results of pseudo switching scheme
Figure BDA0003735101860000102
TABLE 5 pseudo switching scheme library
Figure BDA0003735101860000103
(4) Optimized switching scheme
For the simulated switching schemes in table 5, the unqualified power factor time point data in table 3 are sequentially substituted into the power factor judgment model for calculation, whether the power factor of each unqualified power factor time point is qualified after different simulated switching schemes are adopted is judged, the qualified times of each simulated switching scheme are recorded, and the calculation result is shown in table 6.
Table 6 calculation results of the qualified times of the pseudo switching scheme
Figure BDA0003735101860000104
Figure BDA0003735101860000111
As can be seen from table 6, the number of pass times of the pseudo switching scheme b is the largest. The switching sequence priority is required to be set for a single group of reactive compensation devices of multiple groups of switching reactive compensation devices, the switching priority of the single group of reactive compensation devices which are cut off earliest is highest, the cutting priority of the single group of reactive compensation devices which are put into earliest is highest, the set switching priority is shown in a table 7 according to the actual operation condition of the reactive compensation devices, the single group of reactive compensation devices with the total capacity of 20.4Mvar are put into a virtual switching scheme b based on the switching priority sequence, and the single group of reactive compensation devices are used as an optimized switching scheme and output, and the optimized switching scheme is shown in a table 7.
TABLE 7 switching priority order table and optimized switching scheme
Figure BDA0003735101860000112
Figure BDA0003735101860000121
Figure BDA0003735101860000131

Claims (9)

  1. The method for optimizing the switching strategy of the multiple groups of switching reactive power compensation devices of the 1.220kV transformer substation is characterized by comprising the following steps of:
    s1, collecting substation data: the method comprises the steps of obtaining 220kV transformer operation data, 220kV transformer parameters and the capacity, the number and the operation condition of a plurality of groups of switching reactive compensation devices;
    s2, input data: inputting a time interval to be optimized, the transformer power of each time point and the operation condition of a plurality of groups of switching reactive power compensation devices at the initial time point;
    s3, power factor analysis: calculating substation data according to the power factor analysis model, and judging whether the substation power factor at the time point needing to be optimized is qualified;
    s4, calculating a switching scheme: calculating the unqualified power factor time point by using a switching model to obtain a quasi-switching scheme and adding the quasi-switching scheme to a quasi-switching scheme library;
    s5, optimizing the switching scheme: according to the quasi-switching scheme in the quasi-switching scheme library, sequentially substituting unqualified power factor time point data into a power factor judgment model for calculation to obtain the quasi-switching scheme with the maximum qualified times;
    and outputting an optimized switching scheme according to the simulated switching scheme with the maximum qualified times based on the switching priority order.
  2. 2. The switching strategy optimization method for the multiple groups of switching reactive power compensation devices of the 220kV transformer substation according to claim 1, characterized in that:
    step S3 includes the following steps:
    step S31: setting the initial time point in the time interval to be optimized as t equal to 1, substituting the substation data corresponding to different time points t into the power factor analysis model for calculation, if the calculation result is unqualified, turning to the step S33, and if the calculation result is qualified, turning to the step S32;
    step S32: setting the total number of the time points of the transformer substation to be optimized as T, and if T is less than T, turning to step S31; otherwise, go to step S5;
    step S33: and numbering the unqualified power factor time points in sequence, wherein the number of the first unqualified power factor time point is n-1.
  3. 3. The switching strategy optimization method for the multiple groups of switching reactive power compensation devices of the 220kV transformer substation according to claim 2, characterized in that:
    step S4 includes the following steps:
    step S41: calculating the unqualified power factor time point data by using a switching model to obtain a quasi-switching scheme and adding the quasi-switching scheme to a quasi-switching scheme library;
    if the switching scheme obtained by calculation is consistent with the existing switching scheme in the quasi-switching scheme library, the switching scheme is not added to the quasi-switching scheme library;
    step S42: and when n is n +1, substituting all switching schemes in the simulated switching scheme library and the substation data corresponding to the serial number n into the power factor judgment model for calculation, if the calculation results are unqualified, switching to the step S41, and if the calculation results of 1 or more simulated switching schemes are qualified, switching to the step S32.
  4. 4. The switching strategy optimization method for the multiple groups of switching reactive power compensation devices of the 220kV transformer substation according to claim 3, characterized in that:
    step S5 includes the following steps:
    step S51: for each unqualified power factor time point, calculating the quasi-switching schemes in the quasi-switching scheme library in sequence based on the power factor judgment model, judging whether the power factor of each unqualified power factor time point is qualified after different quasi-switching schemes are adopted, and recording the qualified times of each quasi-switching scheme;
    step S52: and switching the single group of reactive compensation devices according to the simulated switching scheme with the maximum qualified times based on the switching priority order, and outputting an optimized switching scheme.
  5. 5. The switching strategy optimization method for the multiple groups of switching reactive power compensation devices of the 220kV transformer substation according to claim 1, characterized in that: in the step S3, in the step S,
    the power factor analysis model is as follows:
    when in use
    Figure FDA0003735101850000021
    If Q is more than 0 and less than 0.3287P, judging the power factor to be qualified, otherwise, judging the power factor to be unqualified;
    when in use
    Figure FDA0003735101850000022
    If Q is more than 0.3287P, judging the power factor to be qualified, otherwise, judging the power factor to be unqualified;
    in the formula: s e The capacity of the high-voltage side of the transformer; p is the active value of the high-voltage side of the transformer; q is the reactive value of the high-voltage side of the transformer.
  6. 6. The switching strategy optimization method for the multiple groups of switching reactive power compensation devices of the 220kV transformer substation according to claim 1, characterized in that: in the step S4, in the step S,
    the switching model is divided into a peak load switching model and a valley load switching model;
    when in use
    Figure FDA0003735101850000023
    Adopting a peak load switching model:
    0＜QS e -Q c S e +I 0 ％+U d1 ％(P 2 +(Q-Q c ) 2 )+U d2 ％(P 1 2 +Q 1 2 )+U d3 ％(P 2 2 +(Q 2 -Q c ) 2 )＜0.3287PS e (1)
    Q c ≤Q c ' (2)
    0＜QS e +Q d S e +I 0 ％+U d1 ％(P 2 +(Q+Q d ) 2 )+U d2 ％(P 1 2 +Q 1 2 )+U d3 ％(P 2 2 +(Q 2 +Q d ) 2 )＜0.3287PS e (3)
    Q d ≤Q d ' (4)
    when in use
    Figure FDA0003735101850000024
    Adopting a valley load switching model:
    QS e +Q d S e +I 0 ％+U d1 ％(P 2 +(Q+Q d ) 2 )+U d2 ％(P 1 2 +Q 1 2 )+U d3 ％(P 2 2 +(Q 2 +Q d ) 2 )＞0.3287PS e (5)
    Q d ≤Q d ' (6)
    in the formula: s e The capacity of the high-voltage side of the transformer; p is the active value of the high-voltage side of the transformer; q is the reactive value of the high-voltage side of the transformer; p 1 The value is the active value of the medium-voltage side of the transformer; q 1 The value is the reactive value of the medium-voltage side of the transformer; p 2 The value is the active value of the low-voltage side of the transformer; q 2 The value is the reactive value of the low-voltage side of the transformer; q c The sum of the capacities of a single group of reactive compensation devices is planned to be input; q c ' is the total capacity of a single group of reactive power compensation devices which are not put into operation; q d The sum of the capacities of a single group of reactive compensation devices is to be cut; q d ' is the total capacity of a single group of reactive power compensation devices which are put into operation; u shape d1 % is the voltage percentage of the high-voltage impedance of the transformer; u shape d2 % is the voltage percentage of the medium voltage impedance of the transformer; u shape d3 % is the voltage percentage of the low-voltage impedance of the transformer; i is 0 % is percent no-load current.
  7. 7. The switching strategy optimization method for the 220kV transformer substation multi-group switching reactive power compensation device according to claim 1, characterized in that: in the step S5, in the step S,
    the power factor judgment model is as follows:
    when in use
    Figure FDA0003735101850000031
    If satisfy
    Figure FDA0003735101850000032
    Or
    Figure FDA0003735101850000033
    Judging that the power factor is qualified, otherwise, judging that the power factor is unqualified;
    when in use
    Figure FDA0003735101850000034
    If satisfy
    Figure FDA0003735101850000035
    Judging that the power factor is qualified, otherwise, judging that the power factor is unqualified;
    in the formula: s e The capacity of the high-voltage side of the transformer; p is the active value of the high-voltage side of the transformer; q is the reactive value of the high-voltage side of the transformer; q 2 The value is the reactive value of the low-voltage side of the transformer; q c The sum of the capacities of a single group of reactive compensation devices is planned to be input; q d The sum of the capacities of a single group of reactive compensation devices is to be cut; u shape d1 % is the voltage percentage of the high-voltage impedance of the transformer; u shape d3 % is the voltage percentage of the low voltage impedance of the transformer.
  8. 8. The switching strategy optimization method for the multiple groups of switching reactive power compensation devices of the 220kV transformer substation according to claim 1, characterized in that: in step S5, switching order priorities need to be set for the single group of reactive power compensation devices of the multiple groups of switching reactive power compensation devices, the single group of reactive power compensation devices that are switched earliest have the highest input priority, and the single group of reactive power compensation devices that are switched earliest have the highest cutting priority;
    and after each switching of the single group of reactive compensation devices, the switching-in priority and the switching-off priority are reordered.
  9. 9. The switching strategy optimization method for the multiple groups of switching reactive power compensation devices of the 220kV transformer substation according to claim 6 or 7, which is characterized in that:
    capacity and Q of virtual single-group reactive power compensation device c Taking a value in the sum of the capacity combination numbers of the single group of reactive compensation devices which are not put into operation, and preferably selecting a larger capacity value which meets the calculation condition;
    capacity and Q of single-group reactive power compensation device to be cut d At present running listAnd the sum of the capacity combination numbers of the reactive compensation devices is preferably a smaller capacity value which meets the calculation condition.
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