CN115021278B - Switching strategy optimization method for multi-group switching reactive power compensation device of 220kV transformer substation - Google Patents

Switching strategy optimization method for multi-group switching reactive power compensation device of 220kV transformer substation Download PDF

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CN115021278B
CN115021278B CN202210794401.3A CN202210794401A CN115021278B CN 115021278 B CN115021278 B CN 115021278B CN 202210794401 A CN202210794401 A CN 202210794401A CN 115021278 B CN115021278 B CN 115021278B
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switching
transformer
power factor
scheme
reactive
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CN115021278A (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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electrical Variables (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

A switching strategy optimization method for a plurality of groups of switching reactive power compensation devices of a 220kV transformer substation comprises the following steps: collecting data and substation data; inputting data, namely inputting a time interval to be optimized, transformer power at each time point and the like; the power factor analysis is carried out, substation data is calculated according to the power factor analysis model, and whether the power factor of the substation at the time point to be optimized is qualified or not is judged; calculating a switching scheme, namely calculating the time points of unqualified power factors by adopting a switching model to obtain a to-be-switched scheme and adding the to-be-switched scheme to a to-be-switched scheme library; and optimizing the switching scheme, and substituting the unqualified power factor time point data into a power factor judgment model in sequence for calculating aiming at the to-be-switched scheme in the to-be-switched scheme library to obtain the to-be-switched scheme with the largest qualified times. The invention reduces the switching times of the grouping reactive power compensation device while improving the power factor qualification rate of the 220kV transformer substation, and uniformly switches the single-group reactive power compensation device, thereby prolonging the service life of the compensation device.

Description

Switching strategy optimization method for multi-group switching reactive power compensation device 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 a plurality of 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 excessively charged and is not charged and is insufficient in operation, and the problems of large fluctuation compensation effect of a main transformer power factor and the like are caused. The multi-group switching reactive power compensation device divides the whole group reactive power compensation device into a plurality of independent groups, can realize independent group compensation according to actual operation requirements, effectively plays a role in fine compensation of the reactive power compensation device, solves the problem of large fluctuation of power factors of a transformer substation, and is gradually applied to reactive power compensation of the transformer substation.
For a long time, the multi-group switching reactive power compensation device of the 220kV transformer substation still adopts a conventional reactive power compensation switching method: manual control methods and automatic voltage control methods.
The manual control method is characterized in that an operator monitors a 220kV transformer substation in a certain zone, a computer load prediction system is used for judging and assisting to switch the reactive power compensation device according to experience, and when the manual control method is applied to a plurality of groups of switching reactive power compensation devices, the following problems exist: (1) the switching effect is poor; the manual adjustment is often delayed from the dynamic change of the system power flow, so that reactive compensation is not matched with actual requirements, and the power factor of the transformer substation is out of limit. (2) The manual workload is large; the multi-group switching reactive power compensation device is internally provided with a plurality of single-group reactive power compensation devices, the switching workload is several times of that of the conventional reactive power compensation devices, and the workload of operation and maintenance personnel is greatly increased. (3) The switching times are more; when the reactive power change is faster, the manual switching easily causes a plurality of switching times of the single-group reactive power compensation device, thereby reducing the service life of the reactive power compensation device.
The automatic voltage control method aims at optimizing voltage or power factor 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: (1) frequent switching; because the automatic voltage control method has fixed upper and lower limits of control strategy criteria, when the real-time operation data randomly fluctuates around the upper and lower limits of the criteria, the single-group reactive compensation device is frequently switched. (2) Unbalanced switching; the single reactive power compensation devices in the multiple groups of switching reactive power compensation devices are required to be respectively switched, when the automatic voltage control method is used for switching, the switching times among the single groups of reactive power compensation devices are larger, the switching switch with more switching times is damaged, and the switching switch with less switching times generates switch jamming condition due to long-time non-action. (3) The compensation effect is poor; when the method is applied to the multiple groups of switching reactive power compensation devices, the multiple groups of switching reactive power compensation devices of the 220kV transformer substation are not fine enough in compensation, and often cause the condition of overcompensation or undercompensation of the transformer substation, so that the electric energy quality of the 220kV transformer substation is unqualified.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide the switching strategy optimization method for the multi-group switching reactive power compensation devices of the 220kV transformer substation, which can improve the power factor qualification rate of the 220kV transformer substation, ensure that the switching times of the grouping reactive power compensation devices in a selected time interval are 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 220kV transformer operation data, 220kV transformer parameters and capacity, quantity and operation conditions of a plurality of groups of switching reactive power compensation devices;
s2, inputting data: inputting a time interval to be optimized, transformer power at each time point and operation conditions of a plurality of groups of switching reactive power compensation devices at an initial time point;
s3, power factor analysis: calculating substation data according to the power factor analysis model, and judging whether substation power factors at time points to be optimized are qualified or not;
s4, calculating a switching scheme: calculating the time points of unqualified power factors by adopting a switching model to obtain a planned switching scheme and adding the planned switching scheme to a planned switching scheme library;
s5, optimizing a switching scheme: aiming at the to-be-switched scheme in the to-be-switched scheme library, substituting unqualified power factor time point data into a power factor judgment model in sequence to calculate so as to obtain the to-be-switched scheme with the largest qualified times;
based on the switching priority order, outputting an optimized switching scheme according to the quasi-switching scheme with the largest number of times of combining.
Step S3 comprises the steps of:
step S31: setting an initial time point in a time interval to be optimized as t=1, substituting the transformer substation data corresponding to different time points t into a power factor analysis model for calculation, if the calculation result is unqualified, turning to step S33, and if the calculation result is qualified, turning to step S32;
step S32: setting the total number of transformer substation time points to be optimized as T, wherein t=t+1, and if T < T, turning to step S31; otherwise, turning to step S5;
step S33: the unqualified power factor time points are numbered sequentially, and the first unqualified power factor time point is numbered as n=1.
Step S4 comprises the steps of:
step S41: calculating time point data of unqualified power factors by adopting a switching model to obtain a to-be-switched scheme and adding the to-be-switched scheme to a to-be-switched scheme library;
if the calculated switching scheme is consistent with the existing switching scheme in the to-be-switched scheme library, the switching scheme is not added to the to-be-switched scheme library;
step S42: n=n+1, substituting all the switching schemes in the to-be-switched scheme library and the transformer substation data corresponding to the number n into the power factor judgment model for calculation, if the calculation results are all unqualified, turning to step S41, and if 1 or more to-be-switched schemes are qualified, turning to step S32.
Step S5 comprises the steps of:
step S51: calculating the to-be-switched schemes in the to-be-switched scheme library sequentially based on a power factor judging model for each unqualified power factor time point, judging whether the power factor of each unqualified power factor time point is qualified after different to-be-switched schemes are adopted, and recording the qualified times of each to-be-switched scheme;
step S52: based on the switching priority order, switching the single-group reactive compensation device according to the to-be-switched scheme with the largest number of times of combining, and outputting an optimized switching scheme.
In the step S3 of the process,
the power factor analysis model is as follows:
when (when)If the power factor is more than 0 and less than 0.3287P, judging that the power factor is qualified, otherwise, judging that the power factor is unqualified;
when (when)If Q is more than 0.3287P, judging that the power factor is qualified, otherwise, judging that the power factor is unqualified;
wherein: s is 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 power value of the high-voltage side of the transformer.
In the step S4 of the process,
the switching model is divided into a peak load switching model and a valley load switching model;
when (when)The peak load switching model is adopted:
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 (when)Adopting a low-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)
wherein: s is 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 power value of the high-voltage side of the transformer; p (P) 1 The active value of the medium voltage side of the transformer; q (Q) 1 The reactive value of the medium voltage side of the transformer; p (P) 2 The active value of the low-voltage side of the transformer; q (Q) 2 The reactive value of the low-voltage side of the transformer; q (Q) c The sum of the capacities of the single-group reactive compensation devices is calculated; q (Q) c ' is the total capacity of a single set of reactive compensation devices that are not put into operation; q (Q) d The sum of the capacities of the single reactive compensation devices to be cut off; q (Q) d ' is the total capacity of a single set of reactive compensation devices that have been put into operation; u (U) d1 % is the percentage of the high-voltage resistance voltage of the transformer; u (U) d2 % is the percentage of the medium voltage impedance voltage of the transformer; u (U) d3 % is the voltage percent of the transformer voltage impedance; i 0 % is the percentage of no-load current.
In the step S5 of the process,
the power factor judging model is as follows:
when (when)If satisfy->Or->Judging the power factor to be qualified, otherwise, judging the power factor to be unqualified; when->If satisfy->Judging the power factor to be qualified, otherwise, judging the power factor to be unqualified;
wherein: s is 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 power value of the high-voltage side of the transformer; q (Q) 2 The reactive value of the low-voltage side of the transformer; q (Q) c The sum of the capacities of the single-group reactive compensation devices is calculated; q (Q) d The sum of the capacities of the single reactive compensation devices to be cut off; u (U) d1 % is the percentage of the high-voltage resistance voltage of the transformer; u (U) d3 % is the voltage resistance of the transformer.
In step S5, the single reactive power compensation device of the multiple groups of switching reactive power compensation devices needs to set switching sequence priority, the single reactive power compensation device which is cut off earliest has the highest switching priority, and the single reactive power compensation device which is cut off earliest has the highest switching priority;
and after each switching of the single reactive compensation device, the switching and cutting priority is reordered.
Capacity sum Q of single-group reactive compensation device to be put into c The sum of the capacity combination numbers of the single-group reactive power compensation devices which are not put into operation is taken as a value, and a larger capacity value which meets the calculation condition is optimized;
capacity sum Q of single-group reactive compensation device to be cut off d The sum of the capacity combinations of the single reactive compensation device currently running is preferably smaller capacity values meeting the calculation conditions.
In operation, the invention can improve the power factor qualification rate of the 220kV transformer substation in a plurality of continuous time intervals, reduce the switching times of the grouping reactive power compensation devices, and uniformly switch the single-group reactive power compensation devices, thereby effectively reducing the failure rate of the reactive power compensation devices and prolonging the service life of the compensation devices.
When the load changes quickly, the switching strategy optimization method has the advantages that the selection time interval is shorter, the compensation of the multiple groups of switching reactive power compensation devices is finer, the effect is better, 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 invention is described in further detail below with reference to the accompanying drawings. As shown in fig. 1, the invention provides a switching strategy optimization method for a plurality of groups of switching reactive power compensation devices of a 220kV transformer substation, which comprises the following steps:
s1, collecting data
Collecting 220kV transformer operation data, 220kV transformer parameters and capacity, quantity and operation conditions of a plurality of groups of switching reactive power compensation devices;
s2, inputting data
And inputting the time interval to be optimized, the transformer power of each time point and the running conditions of a plurality of groups of switching reactive power compensation devices of the initial time point.
S3, power factor analysis
And calculating substation data according to the power factor analysis model, and judging whether the substation power factor at the time point to be optimized is qualified or not. The power factor analysis model is:
when (when)If the power factor 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->If Q > 0.3287P is satisfied, the power factor is judged to be qualified, otherwise, the power factor is judged to be unqualified.
Wherein: s is 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 power value of the high-voltage side of the transformer;
step S3 comprises the steps of:
step S31: setting an initial time point in a time interval to be optimized as t=1, substituting the transformer substation data corresponding to different time points t into a power factor analysis model for calculation, if the calculation result is unqualified, turning to step S33, and if the calculation result is qualified, turning to step S32;
step S32: setting the total number of transformer substation time points to be optimized as T, wherein t=t+1, and if T < T, turning to step S31; otherwise, go to step S5 (i.e., step S51);
step S33: the unqualified power factor time points are numbered sequentially, and the first unqualified power factor time point is numbered as n=1.
S4, calculating a switching scheme
And calculating the time points of the unqualified power factors by adopting a switching model to obtain a planned switching scheme and adding the planned switching scheme to a planned switching scheme library. The switching model is divided into a peak load switching model and a valley load switching model.
When (when)The peak load switching model is adopted:
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 (when)Adopting a low-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)
wherein: s is 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 power value of the high-voltage side of the transformer; p (P) 1 The active value of the medium voltage side of the transformer; q (Q) 1 The reactive value of the medium voltage side of the transformer; p (P) 2 The active value of the low-voltage side of the transformer; q (Q) 2 The reactive value of the low-voltage side of the transformer; q (Q) c The sum of the capacities of the single-group reactive compensation devices is calculated; q (Q) c ' is the total capacity of a single set of reactive compensation devices that are not put into operation; q (Q) d The sum of the capacities of the single reactive compensation devices to be cut off; q (Q) d ' is the total capacity of a single set of reactive compensation devices that have been put into operation; u (U) d1 % is the percentage of the high-voltage resistance voltage of the transformer; u (U) d2 % is the percentage of the medium voltage impedance voltage of the transformer; u (U) d3 % is the voltage percent of the transformer voltage impedance; i 0 % is the percentage of no-load current.
Step S4 comprises the steps of:
step S41: calculating time point data of unqualified power factors by adopting a switching model to obtain a to-be-switched scheme and adding the to-be-switched scheme to a to-be-switched scheme library;
if the calculated switching scheme is consistent with the existing switching scheme in the to-be-switched scheme library, the switching scheme is not added to the to-be-switched scheme library;
step S42: n=n+1, substituting all the switching schemes in the to-be-switched scheme library and the transformer substation data corresponding to the number n into the power factor judgment model for calculation, if the calculation results are all unqualified, turning to step S41, and if 1 or more to-be-switched schemes are qualified, turning to step S32.
S5, optimizing switching scheme
And substituting the unqualified power factor time point data into a power factor judgment model in sequence for calculation aiming at the to-be-switched schemes in the to-be-switched scheme library to obtain the to-be-switched scheme with the largest qualified times. The single reactive power compensation device of the multiple groups of switching reactive power compensation devices is required to be provided with switching sequence priority, the single reactive power compensation device which is cut off earliest is the highest in switching priority, and the single reactive power compensation device which is cut off earliest is the highest in switching priority. And after each switching of the single reactive compensation device, the switching and cutting priority is reordered. Based on the switching priority order, switching the single-group reactive compensation device according to the to-be-switched scheme with the largest number of times of combining, and outputting an optimized switching scheme. The power factor judging model is as follows:
when (when)If satisfy->Or->And judging the power factor to be qualified, otherwise, judging the power factor to be unqualified.
When (when)If satisfy->And judging the power factor to be qualified, otherwise, judging the power factor to be unqualified.
Wherein: s is 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 power value of the high-voltage side of the transformer; q (Q) 2 The reactive value of the low-voltage side of the transformer; q (Q) c The sum of the capacities of the single-group reactive compensation devices is calculated; q (Q) d The sum of the capacities of the single reactive compensation devices to be cut off; u (U) d1 % is the percentage of the high-voltage resistance voltage of the transformer; u (U) d3 % is the voltage resistance of the transformer.
Step S5 comprises the steps of:
step S51: calculating the to-be-switched schemes in the to-be-switched scheme library sequentially based on a power factor judging model for each unqualified power factor time point, judging whether the power factor of each unqualified power factor time point is qualified after different to-be-switched schemes are adopted, and recording the qualified times of each to-be-switched scheme;
step S52: based on the switching priority order, switching the single-group reactive compensation device according to the to-be-switched scheme with the largest number of times of combining, and outputting an optimized switching scheme.
In the steps S4 and S5, the capacity and Q of the single-group reactive compensation device are to be put into c The sum of the capacity combination numbers of the single-group reactive power compensation devices which are not put into operation is taken as a value, and a larger capacity value which meets the calculation condition is optimized; capacity sum Q of single-group reactive compensation device to be cut off d The sum of the capacity combinations of the single reactive compensation device currently running is preferably smaller capacity values meeting the calculation conditions.
The calculation result of the peak load switching model is the capacity and Q of the reactive power compensation device to be put into a single group c Or to cut off the capacity and Q of a single set of reactive compensation devices d One of them.
The implementation process of the invention is further illustrated step by a 220kV substation example.
(1) Collecting data
The method comprises the steps of collecting parameters of a 220kV transformer substation transformer, and the capacities and the numbers of a plurality of groups of switching reactive power compensation devices are as follows: the number of the transformers is 1, and the capacity of the transformers is 180/180/90MVA; high-voltage resistance voltage percentage U of transformer d1 % =13.5%; percentage U of medium voltage impedance voltage of transformer d2 -0.5%; voltage percent U of transformer d3 "% = 50.5%; percentage no-load current I 0 The percent is=0.04 percent, and 4 sets of 6Mvar multi-group switching reactive power compensation devices (grouping party) are configured at presentThe formula is 1.2+1.2+1.2+1.2+1.2+1.2Mvar, and 5 single-group reactive power compensation devices are arranged in each multi-group switching reactive power compensation device. In addition, 220kV transformer operation data are collected in real time.
(2) Input data
The time interval to be optimized is set by the user, and the shorter the time interval to be optimized is, the more frequent the compensation switching of the multi-group switching reactive power compensation device is, the finer the compensation is, and the effect is better. In this embodiment, 10 typical operation data of a time interval to be optimized are selected for illustration, the operation data of the 220kV transformer are shown in table 1, and the operation conditions of the multi-group switching reactive power compensation device at the initial time point are shown in table 2.
Table 1 220kv transformer operating data
Table 2 initial time Point operation conditions of multiple groups of switching reactive compensation devices
(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 to be optimized is qualified or not. The failed power factor time points are numbered sequentially, the first failed power factor time point is numbered n=1, and the power factor analysis results are shown in table 3.
TABLE 3 Power factor analysis results
(4) Switching scheme calculation
And calculating a switching scheme, namely firstly adopting a switching model to calculate the time points of unqualified power factors in the table 3, and the calculation results are shown in the table 4. The proposed switching scheme in table 4 was then added to the proposed switching scheme library, which is shown in table 5.
TABLE 4 calculation results of pseudo-switching scheme
TABLE 5 library of pseudo-switching schemes
(4) Optimized switching scheme
For the proposed switching scheme in table 5, the unqualified power factor time point data in table 3 are substituted into the power factor judgment model in sequence to calculate, whether the power factor of each unqualified power factor time point is qualified after different proposed switching schemes are adopted is judged, the qualified times of each proposed switching scheme are recorded, and the calculation result is shown in table 6.
TABLE 6 results of pass times calculation for pseudo-switching scheme
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As can be seen from table 6, the number of pass of the proposed switching scheme b is the largest. The single reactive power compensation device of the multi-group switching reactive power compensation device is required to be provided with switching sequence priority, the single reactive power compensation device which is cut off earliest is highest in switching priority, the set switching priority is shown in a table 7 according to the actual running condition of the reactive power compensation device, the single reactive power compensation device with the total capacity of 20.4Mvar is put into according to a planned switching scheme b based on the switching priority sequence, and the single reactive power compensation device is used as an optimized switching scheme and output, and the optimized switching scheme is shown in the table 7.
TABLE 7 switching priority order Table and optimized switching scheme
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Claims (8)

  1. The switching strategy optimization method for the multi-group switching reactive power compensation device of the 220kV transformer substation is characterized by comprising the following steps of:
    s1, collecting substation data: the method comprises 220kV transformer operation data, 220kV transformer parameters and capacity, quantity and operation conditions of a plurality of groups of switching reactive power compensation devices;
    s2, inputting data: inputting a time interval to be optimized, transformer power at each time point and operation conditions of a plurality of groups of switching reactive power compensation devices at an initial time point;
    s3, power factor analysis: calculating substation data according to the power factor analysis model, and judging whether substation power factors at time points to be optimized are qualified or not;
    s4, calculating a switching scheme: calculating the time points of unqualified power factors by adopting a switching model to obtain a planned switching scheme and adding the planned switching scheme to a planned switching scheme library;
    s5, optimizing a switching scheme: aiming at the to-be-switched scheme in the to-be-switched scheme library, substituting unqualified power factor time point data into a power factor judgment model in sequence to calculate so as to obtain the to-be-switched scheme with the largest qualified times;
    based on the switching priority order, outputting an optimized switching scheme according to the to-be-switched scheme with the largest number of times of combining;
    step S5 comprises the steps of:
    step S51: calculating the to-be-switched schemes in the to-be-switched scheme library sequentially based on a power factor judging model for each unqualified power factor time point, judging whether the power factor of each unqualified power factor time point is qualified after different to-be-switched schemes are adopted, and recording the qualified times of each to-be-switched scheme;
    step S52: based on the switching priority order, switching the single-group reactive compensation device according to the to-be-switched scheme with the largest number of times of combining, and outputting an optimized switching scheme.
  2. 2. The method for optimizing the switching strategy of the multi-group switching reactive power compensation device of the 220kV transformer substation according to claim 1 is characterized in that:
    step S3 comprises the steps of:
    step S31: setting an initial time point in a time interval to be optimized as t=1, substituting the transformer substation data corresponding to different time points t into a power factor analysis model for calculation, if the calculation result is unqualified, turning to step S33, and if the calculation result is qualified, turning to step S32;
    step S32: setting the total number of transformer substation time points to be optimized as T, wherein t=t+1, and if T < T, turning to step S31; otherwise, turning to step S5;
    step S33: the unqualified power factor time points are numbered sequentially, and the first unqualified power factor time point is numbered as n=1.
  3. 3. The method for optimizing the switching strategy of the multi-group switching reactive power compensation device of the 220kV transformer substation according to claim 2 is characterized in that:
    step S4 comprises the steps of:
    step S41: calculating time point data of unqualified power factors by adopting a switching model to obtain a to-be-switched scheme and adding the to-be-switched scheme to a to-be-switched scheme library;
    if the calculated switching scheme is consistent with the existing switching scheme in the to-be-switched scheme library, the switching scheme is not added to the to-be-switched scheme library;
    step S42: n=n+1, substituting all the switching schemes in the to-be-switched scheme library and the transformer substation data corresponding to the number n into the power factor judgment model for calculation, if the calculation results are all unqualified, turning to step S41, and if 1 or more to-be-switched schemes are qualified, turning to step S32.
  4. 4. The method for optimizing the switching strategy of the multi-group switching reactive power compensation device of the 220kV transformer substation according to claim 1 is characterized in that: in the step S3 of the process,
    the power factor analysis model is as follows:
    when (when)If the power factor is more than 0 and less than 0.3287P, judging that the power factor is qualified, otherwise, judging that the power factor is unqualified;
    when (when)If Q is more than 0.3287P, judging that the power factor is qualified, otherwise, judging that the power factor is unqualified;
    wherein: s is 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 power value of the high-voltage side of the transformer.
  5. 5. The method for optimizing the switching strategy of the multi-group switching reactive power compensation device of the 220kV transformer substation according to claim 1 is characterized in that: in the step S4 of the process,
    the switching model is divided into a peak load switching model and a valley load switching model;
    when (when)The peak load switching model is adopted:
    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 (when)Adopting a low-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)
    wherein: s is 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 power value of the high-voltage side of the transformer; p (P) 1 The active value of the medium voltage side of the transformer; q (Q) 1 The reactive value of the medium voltage side of the transformer; p (P) 2 The active value of the low-voltage side of the transformer; q (Q) 2 The reactive value of the low-voltage side of the transformer; q (Q) c The sum of the capacities of the single-group reactive compensation devices is calculated; q (Q) c ' is the total capacity of a single set of reactive compensation devices that are not put into operation; q (Q) d The sum of the capacities of the single reactive compensation devices to be cut off; q (Q) d ' is the total capacity of a single set of reactive compensation devices that have been put into operation; u (U) d1 % is the percentage of the high-voltage resistance voltage of the transformer; u (U) d2 % is the percentage of the medium voltage impedance voltage of the transformer; u (U) d3 % is the voltage percent of the transformer voltage impedance; i 0 % is the percentage of no-load current.
  6. 6. The method for optimizing the switching strategy of the multi-group switching reactive power compensation device of the 220kV transformer substation according to claim 1 is characterized in that: in the step S5 of the process,
    the power factor judging model is as follows:
    when (when)If satisfy->Or (b)Judging the power factor to be qualified, otherwise, judging the power factor to be unqualified; when->If satisfy->Judging the power factor to be qualified, otherwise, judging the power factor to be unqualified;
    wherein: s is 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 power value of the high-voltage side of the transformer; q (Q) 2 The reactive value of the low-voltage side of the transformer; q (Q) c To be put intoThe sum of the capacities of the single-group reactive compensation devices; q (Q) d The sum of the capacities of the single reactive compensation devices to be cut off; u (U) d1 % is the percentage of the high-voltage resistance voltage of the transformer; u (U) d3 % is the voltage resistance of the transformer.
  7. 7. The method for optimizing the switching strategy of the multi-group switching reactive power compensation device of the 220kV transformer substation according to claim 1 is characterized in that: in step S5, the single reactive power compensation device of the multiple groups of switching reactive power compensation devices needs to set switching sequence priority, the single reactive power compensation device which is cut off earliest has the highest switching priority, and the single reactive power compensation device which is cut off earliest has the highest switching priority;
    and after each switching of the single reactive compensation device, the switching and cutting priority is reordered.
  8. 8. The method for optimizing the switching strategy of the multi-group switching reactive power compensation device of the 220kV transformer substation according to claim 5 or 6, wherein the method comprises the following steps of:
    capacity sum Q of single-group reactive compensation device to be put into c The sum of the capacity combination numbers of the single-group reactive power compensation devices which are not put into operation is taken as a value, and a larger capacity value which meets the calculation condition is optimized;
    capacity sum Q of single-group reactive compensation device to be cut off d The sum of the capacity combinations of the single reactive compensation device currently running is preferably smaller capacity values meeting the calculation conditions.
CN202210794401.3A 2022-07-07 2022-07-07 Switching strategy optimization method for multi-group switching reactive power compensation device of 220kV transformer substation Active CN115021278B (en)

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