CN114069715A - Optimal transformer substation voltage control method and system based on daily voltage qualification rate theory - Google Patents
Optimal transformer substation voltage control method and system based on daily voltage qualification rate theory Download PDFInfo
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- 238000010248 power generation Methods 0.000 claims description 16
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- 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]
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
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Abstract
The invention belongs to the technical field of transformer substations, and particularly relates to a transformer substation voltage control method and system based on daily voltage qualification rate, wherein the daily voltage qualification rate refers to the daily voltage qualification rate of low-voltage residents. According to the invention, firstly, the low-voltage user voltage value interfered by the grid connection of the distributed power supply is removed by a strategy, and then the optimal transformer ratio of the transformer substation and the optimal overall distribution transformation ratio based on the daily voltage qualification rate theory are realized by analyzing the specific relation among the transformer ratio of the transformer substation, the public distribution transformation ratio and the low-voltage user voltage, so that the problems of the accurate control of the transformer substation voltage and the calculation of the overall distribution transformation ratio are finally solved, the accurate positioning of voltage abnormal users without operation and maintenance factors is realized, and meanwhile, the daily voltage qualification rate is also well optimized and improved.
Description
Technical Field
The invention belongs to the technical field of transformer substations, and particularly relates to a transformer substation voltage control method and system based on daily voltage qualification rate, wherein the daily voltage qualification rate refers to the daily voltage qualification rate of low-voltage residents.
Background
The transformer substation is a place for converting voltage and current, receiving electric energy and distributing the electric energy in an electric power system; the low-voltage user voltage qualification rate in the transformer substation is mainly influenced by operation and maintenance factors and equipment factors, wherein the operation and maintenance factors mainly comprise higher-level power supply voltage fluctuation, distribution transformation ratio, load change, photovoltaic power generation and the like; if the influence of operation and maintenance factors is not solved, the equipment transformation is also interfered by data fluctuation, so that the reason of voltage abnormity cannot be determined, and the difficulty is brought to equipment investment and operation and maintenance management.
The current substation voltage control has the following problems: 1. the transformer ratio of the transformer substation lacks an accurate calculation control method; 2. the distribution transformation ratio lacks an effective global calculation regulation and control method; 3. the distributed power supply grid connection affects the voltage of a low-voltage user, and the optimal transformer substation voltage control calculation based on the daily voltage qualification rate theory can be interfered.
Disclosure of Invention
In order to solve the problems, the invention provides a transformer substation voltage control method and system based on the optimal daily voltage qualification rate theory. According to the invention, firstly, the low-voltage user voltage value interfered by the grid connection of the distributed power supply is removed by a strategy, and then the optimal transformer ratio of the transformer substation and the optimal overall distribution transformation ratio based on the daily voltage qualification rate theory are realized by analyzing the specific relation among the transformer ratio of the transformer substation, the public distribution transformation ratio and the low-voltage user voltage, so that the problems of the accurate control of the transformer substation voltage and the calculation of the overall distribution transformation ratio are finally solved, the accurate positioning of voltage abnormal users without operation and maintenance factors is realized, and meanwhile, the daily voltage qualification rate is also well optimized and improved.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a transformer substation voltage control method based on daily voltage qualification rate theory optimization, which comprises the following steps:
obtaining the transformation ratio change of all public distribution transformers at all times in the day and the transformation ratio of the 10kV bus voltage of the transformer substation;
sequentially determining the low-voltage user voltage at all times in the day through the change ratio change and the voltage change ratio; when the low-voltage user voltage at all moments is determined, the low-voltage user voltage interfered by the grid connection of the distributed power supply is eliminated;
calculating and comparing the qualified rate of the corresponding low-voltage user voltage at all moments, and determining the maximum qualified rate value;
and controlling the transformer substation according to the voltage amplitude of the 10kV bus of the transformer substation corresponding to the moment with the maximum qualified rate value and the transformation ratio of all public distribution transformers.
Further, rejecting low-voltage user voltage interfered by the grid connection of the distributed power supply comprises:
acquiring low-voltage user voltages of all distributed power supply distribution transformers at a certain moment;
acquiring all low-voltage power utilization users and power generation users behind a low-voltage user access point of the distributed power supply distribution transformer;
acquiring the sum of all low-voltage power consumer currents and the sum of all power generation consumer currents;
and if the sum of all the low-voltage electricity user currents is smaller than the sum of all the electricity generation user currents, rejecting the low-voltage user voltage of the distributed power supply distribution transformer at the moment.
Further, reject the low pressure user voltage that is incorporated into the power networks and is disturbed by distributed generator, still include:
acquiring power generation user grid-connected voltages of all distributed power supply distribution transformers at a certain moment;
making a difference between the grid-connected voltage and the outlet voltage;
and if the difference between the grid-connected voltage and the outlet voltage is greater than or equal to 0, eliminating the voltage of all low-voltage users at the moment after the grid-connected point of the power generation users.
Further, voltages with the voltage amplitude smaller than 120V and larger than 300V in the low-voltage user voltage in the day are eliminated.
Further, when the transformation ratio change of all public distribution transformers at all times in the day and the voltage change ratio of the 10kV bus of the transformer substation are obtained, the data obtaining frequency is kept consistent.
Further, the determined low-voltage user voltages at all times of the day are stored in a data table, and the low-voltage user voltages in the data table are partitioned according to different times.
Further, the qualification rate of the low-voltage user voltage is as follows: the number of the low-voltage users with the voltage value of the low-voltage users in the preset range is compared with the total number of the upper low-voltage users.
Further, when the low-voltage user voltage at all times in the day is determined through the change ratio, the relation formula is as follows:
wherein ,
indicating the low-voltage user voltage after the change ratio is changed,
representing the ratio of all common distribution variations after change,
representing the current operating ratio of all common distribution transformers,
representing the low voltage user voltage at all times of the day before the change ratio is changed,
is shown as
The table is changed in a matching way,
is shown as
The number of the users with low voltage is reduced,
representing time.
Further, when the low-voltage user voltage at all times in the day is determined through the voltage change ratio, the relation formula is as follows:
wherein ,
represents the low-voltage user voltage after the voltage change,
represents the 10kV bus voltage of the substation after the voltage change,
and the 10kV bus voltage of the transformer substation at all times before the voltage change is shown.
Further, theoretical transformation ratios and global distribution transformation theoretical transformation ratios of the transformer substation at all moments based on the daily voltage qualification rate theory are determined.
In a second aspect, the present invention further provides a transformer substation voltage control system based on the daily voltage yield theory optimization, including:
the transformer substation voltage control system based on the daily voltage qualification rate theory optimization comprises a data acquisition module, a low-voltage user daily voltage calculation module, a voltage qualification rate calculation module and a transformer substation voltage control module.
The data acquisition module configured to: acquiring current operation transformation ratios of all public distribution transformers in the day, operation transformation ratios of transformer substations at all times, 10kV bus voltage values, all low-voltage user voltage values, distributed generation user current voltage values and distribution transformer outlet voltages;
the low-voltage user daily voltage calculation module is configured to: sequentially determining the low-voltage user voltage at all times in the day through the change ratio change and the voltage change ratio; when the low-voltage user voltage at all moments is determined, the low-voltage user voltage interfered by the grid connection of the distributed power supply is eliminated;
the substation control module is configured to: controlling the transformer substation according to the voltage amplitude of the 10kV bus of the transformer substation corresponding to the moment with the maximum qualified rate value and the transformation ratio of all public distribution transformers;
the low-voltage user voltage data yield calculation module is configured to: and calculating and comparing the qualified rate of the corresponding low-voltage user voltage in all the moments, and determining the maximum qualified rate value.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the low-voltage user voltage value interfered by the grid connection of the distributed power supply is eliminated, and the transformer ratio and the distribution transformer ratio calculation based on the transformer substation are carried out according to the specific relation among the 10kV bus voltage value, the distribution transformer outlet voltage value and the low-voltage user voltage value. Calculating and comparing the qualified rate of the corresponding low-voltage user voltage in all moments, and determining the maximum theoretical value of the qualified rate; when the qualification rate theory is the maximum, the transformer ratio of the transformer station and the transformation ratios of all public distribution transformers are obtained, the transformer station voltage control parameters based on the optimal voltage qualification rate are obtained, and the accurate control of the transformer station voltage and the distribution transformation ratios is realized.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the present embodiments, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the present embodiments and together with the description serve to explain the present embodiments without unduly limiting the present embodiments.
FIG. 1 is a block diagram of the programming of an implementation process of embodiment 1 of the present invention;
fig. 2 is a schematic view of a low-voltage electricity consumer access point according to embodiment 1 of the present invention;
fig. 3 is a schematic diagram of a power generation user grid-connected point in embodiment 1 of the present invention.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
Example 1:
the embodiment discloses a transformer substation voltage control method based on daily voltage qualification rate theory optimization, which comprises the following steps:
acquiring current operation transformation ratios of all public distribution transformers in the day, operation transformation ratios of transformer substations at all times, 10kV bus voltage values, all low-voltage user voltage values, distributed generation user current voltage values, distribution transformer outlet voltages and a power supply topological graph containing a distributed power supply;
and eliminating the low-voltage user voltage value interfered by the grid connection of the distributed power supply, and calculating the transformation ratio and the distribution transformation ratio based on the transformer of the transformer substation according to the specific relation among the voltage value of the 10kV bus, the voltage value of the distribution transformer outlet and the low-voltage user voltage value.
Calculating and comparing the qualified rate of the corresponding low-voltage user voltage in all moments, and determining the maximum theoretical value of the qualified rate;
when the qualification rate theory is the maximum, the transformer ratio of the transformer station and the transformation ratios of all public distribution transformers are obtained, the transformer station voltage control parameters based on the optimal voltage qualification rate are obtained, and the accurate control of the transformer station voltage and the distribution transformation ratios is realized.
As shown in fig. 1, the implementation process of this embodiment is as follows:
in this embodiment, the data is acquired and sorted as follows:
in this embodiment, the 10kV bus voltage of the transformer substation in the day is obtained
The spreadsheet or database tools may be applied for collation, written as:
wherein ,
indicating the time of day.
In this embodiment, all public distribution transformers under 10kV station buses of the substation are counted
In this embodiment, all distribution transformers can be set as national standard three-level transformers, and sorted by spreadsheet or database tools, and recorded as:
wherein ,
is shown as
The station common distribution becomes.
In this embodiment, the low-voltage user voltages at all times in the same day are collected, sorted by using a spreadsheet or a database tool, and recorded as:
wherein ,
is shown as
The station common distribution is changed in such a way that,
is shown as
And (4) users.
In this embodiment, statistics is performed on distributed power distribution transformers installed in order, power generation user currents of all distributed power distribution transformers in the distribution power distribution transformer in the next day are collected, and the power generation user currents are sorted by using a spreadsheet or a database tool and recorded as:
wherein ,
is shown as
The table is changed in a matching way,
is shown as
And (4) users.
In this embodiment, statistics is performed on the distributed power distribution transformer installed in order, all low-voltage power consumption user currents under the intra-day distributed power distribution transformer are collected, and the currents are sorted by using a spreadsheet or a database tool and recorded as:
wherein ,
is shown as
The table is changed in a matching way,
is shown as
And (4) users.
In this embodiment, all the distributed power distribution transformers are statistically sorted, and the grid-connected voltages of all the power generation users under the distributed power distribution transformers are collected and recorded as
Collecting and recording the outlet voltage of the distribution transformer of the distributed power supply
, wherein ,
is shown as
The table is changed in a matching way,
indicates the second under the second distribution
And a power generation user.
In this embodiment, the power supply topological diagram of the distributed power supply distribution transformer is statistically organized and installed.
In this embodiment, the data checking and processing is as follows:
in this embodiment, gather the 10kV station busbar voltage of the inner day transformer station, the collection frequency can be set by oneself, but it should be consistent with the collection frequency and the collection time of the low-voltage user voltage, and it is ensured that the acquired 10kV station busbar voltage of the inner day transformer station is accurate and comprehensive.
In the embodiment, the voltage acquisition frequency and the acquisition time of the intra-day low-voltage user are consistent with the acquisition frequency and the acquisition time of the bus voltage of the 10kV substation of the transformer substation; after the voltage of the users at the low voltage of the next day is obtained, the low voltage user voltages with the voltage amplitude smaller than 120V and larger than 300V in the voltage of the users at the low voltage of the next day can be screened and eliminated by applying the screening function of the electronic form or the database.
In this embodiment, as shown in fig. 2, the low-voltage user voltages of all distributed power supply distribution transformers at a certain time are analyzed, and according to the topological graph, the sum of all low-voltage user currents after the low-voltage user access point of the distributed power supply distribution transformer is used
Decrease, decreaseTo sum all the electricity generation user currents
It is written as:
when in use
And in time, the low-voltage user voltage of the distributed power supply distribution transformer at the moment is removed, and the low-voltage user voltage does not participate in the following calculation.
In this embodiment, as shown in fig. 3, the grid-connected voltage of the power generation users of all the distributed power supply distribution transformers at a certain time is analyzed
The grid-connected voltage and the outlet voltage are compared
Make a difference, record as:
wherein ,
and
synchronization number when
And in time, the voltage of all low-voltage users at the moment after the power generation user grid connection point is removed, and the low-voltage users do not participate in the following calculation.
In this embodiment, the relationship between the change of the common distribution transformation ratio and the low-voltage user voltage is as follows:
wherein ,
indicating the low-voltage user voltage after the change ratio is changed,
representing the ratio of all common distribution variations after change,
representing the current operating ratio of all common distribution transformers,
representing the low voltage user voltage at all times of the day before the change ratio is changed,
is shown as
The table is changed in a matching way,
is shown as
The number of the users with low voltage is reduced,
representing time.
In this embodiment, the low-voltage user voltage value data tables for recording all the changes of the distribution transformation ratio are sorted, and the number of the sorted data tables is arranged
And (3) opening the table, numbering the table one by one, and recording as follows:
. wherein ,
the first to indicate the arrangement after the change of the distribution transformation ratio
The voltage value data table of low voltage user, it should be noted here that each table corresponds to a time.
In the embodiment, the voltage transformation ratio of the 10kV bus of the transformer substation and the voltage transformation ratio
The relationship of the low-voltage user voltage values in the sheet table is as follows:
considering only time, and not tables, the expression is:
wherein ,
represents the low-voltage user voltage after the voltage change,
represents the 10kV bus voltage of the substation after the voltage change,
and the 10kV bus voltage of the transformer substation at all times before the voltage change is shown.
In the embodiment, the number of users with the amplitude of the low-voltage user voltage between 198V and 235.4V at each moment of each table is calculated by the formula (9), and only the selection is carried out
And counting the voltage amplitude of the 10kV bus of the transformer substation with the maximum number of qualified low-voltage users at each moment in the sheet into a data sheet, and recording the data sheet
，
Number of tables and
all are as follows
And (5) opening the paper.
In this example, statistics
The number of qualified low voltage users between 198V-235.4V in the table is recorded as
The total number of users is recorded as
The low-voltage user voltage qualification rate calculation formula is as follows:
in this embodiment, the pass rate of the low-voltage user voltage
And when the daily voltage qualification rate of the low-voltage user is the maximum, the voltage amplitude and the distribution transformation ratio of the 10kV bus of the transformer substation are calculated based on the voltage amplitude and the public distribution transformation ratio of the 10kV bus of the transformer substation with the optimal daily voltage qualification rate of the low-voltage user and recorded as the calculation results
And
and further obtaining the optimal theoretical transformation ratio of the transformer substation based on the low-voltage user voltage qualification rate theory.
Example 2:
the embodiment provides a transformer substation voltage control system based on daily voltage qualification rate theory is optimal, includes:
the transformer substation voltage control system based on the daily voltage qualification rate theory optimization comprises a data acquisition module, a low-voltage user daily voltage calculation module, a low-voltage user voltage data qualification rate calculation module and a transformer substation control module;
the data acquisition module configured to: acquiring current operation transformation ratios of all public distribution transformers in the day, operation transformation ratios of transformer substations at all times, 10kV bus voltage values, all low-voltage user voltage values, distributed generation user current voltage values and distribution transformer outlet voltages;
the low-voltage user daily voltage calculation module is configured to: sequentially determining the low-voltage user voltage at all times in the day through the change ratio change and the voltage change ratio; when the low-voltage user voltage at all moments is determined, the low-voltage user voltage interfered by the grid connection of the distributed power supply is eliminated;
the low-voltage user voltage data yield calculation module is configured to: calculating and comparing the qualified rate of the corresponding low-voltage user voltage at all moments, and determining the maximum qualified rate value;
the substation control module is configured to: and controlling the voltage of the transformer substation according to the voltage amplitude of the 10kV bus of the transformer substation corresponding to the moment with the maximum qualified rate value and the transformation ratio of all public distribution transformers.
By applying the method of the embodiment, voltage data of a certain transformer substation and all low-voltage users belonging to the transformer substation for three consecutive days are sorted, analyzed, judged and calculated, optimal transformer substation voltage analysis data suitable for voltage data of all low-voltage resident users are generated within a specified voltage range, and voltage practitioners set parameters of a transformer substation management system according to the data, so that the voltage qualification rate of the low-voltage users of the transformer substation is improved by 1.5%, a large amount of manpower and material resources are saved, cost investment is saved, the electric energy quality is greatly improved, and the potential value is mined.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can make various modifications and variations. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present embodiment should be included in the protection scope of the present embodiment.
Claims (10)
1. The optimal transformer substation voltage control method based on the daily voltage qualification rate theory is characterized by comprising the following steps of:
obtaining the transformation ratio change of all public distribution transformers at all times in the day and the transformation ratio of the 10kV bus voltage of the transformer substation;
sequentially determining the low-voltage user voltage at all times in the day through the change ratio change and the voltage change ratio; when the low-voltage user voltage at all moments is determined, the low-voltage user voltage interfered by the grid connection of the distributed power supply is eliminated;
calculating and comparing the qualified rate of the corresponding low-voltage user voltage at all moments, and determining the maximum qualified rate value;
and controlling the transformer substation according to the voltage amplitude of the 10kV bus of the transformer substation corresponding to the moment with the maximum qualified rate value and the transformation ratio of all public distribution transformers.
2. The optimal transformer substation voltage control method based on the daily voltage yield theory as claimed in claim 1, characterized in that when determining the low-voltage user voltage at all times in the day through the transformation ratio change, the relation adopted is as follows:
wherein ,
indicating the low-voltage user voltage after the change ratio is changed,
representing the ratio of all common distribution variations after change,
representing the current operating ratio of all common distribution transformers,
representing the low voltage user voltage at all times of the day before the change ratio is changed,
is shown as
The table is changed in a matching way,
is shown as
The number of the users with low voltage is reduced,
representing time.
3. The optimal transformer substation voltage control method based on the daily voltage yield theory as claimed in claim 2, characterized in that when the low-voltage user voltages at all times in the day are determined through the voltage change ratio, the relation adopted is as follows:
wherein ,
represents the low-voltage user voltage after the voltage change,
represents the 10kV bus voltage of the substation after the voltage change,
and the 10kV bus voltage of the transformer substation at all times before the voltage change is shown.
4. The optimal transformer substation voltage control method based on the daily voltage qualification rate theory of claim 1, wherein the step of eliminating the low-voltage user voltage interfered by the grid connection of the distributed power supply comprises the following steps:
acquiring low-voltage user voltages of all distributed power supply distribution transformers at a certain moment;
acquiring all low-voltage power utilization users and power generation users behind a low-voltage user access point of the distributed power supply distribution transformer;
acquiring the sum of all low-voltage power consumer currents and the sum of all power generation consumer currents;
and if the sum of all the low-voltage electricity user currents is smaller than the sum of all the electricity generation user currents, rejecting the low-voltage user voltage of the distributed power supply distribution transformer at the moment.
5. The optimal transformer substation voltage control method based on the daily voltage qualification rate theory of claim 4, wherein the low-voltage user voltage interfered by the grid connection of the distributed power supply is eliminated, and the method further comprises the following steps:
acquiring power generation user grid-connected voltages of all distributed power supply distribution transformers at a certain moment;
making a difference between the grid-connected voltage and the outlet voltage;
and if the difference between the grid-connected voltage and the outlet voltage is greater than or equal to 0, eliminating the voltage of all low-voltage users at the moment after the grid-connected point of the power generation users.
6. The optimal transformer substation voltage control method based on the daily voltage yield theory as claimed in claim 1, characterized in that voltages with a voltage amplitude smaller than 120V and larger than 300V in the daily low-voltage user voltage are rejected.
7. The optimal transformer substation voltage control method based on the daily voltage qualification rate theory as claimed in claim 1, wherein when the transformation ratio change of all public distribution transformers at all times in the day and the voltage change ratio of a 10kV bus of a transformer substation are obtained, the data obtaining frequency is kept consistent.
8. The optimal transformer substation voltage control method based on the daily voltage qualification rate theory as claimed in claim 1, wherein the determined low voltage user voltages at all times of the day are stored in a data table, and the low voltage user voltages in the data table are partitioned according to different times.
9. The optimal transformer substation voltage control method based on the daily voltage qualification rate theory as claimed in claim 1, wherein the qualification rate of the low-voltage user voltage is as follows: the number of the low-voltage users with the voltage value of the low-voltage users in the preset range is compared with the total number of the upper low-voltage users.
10. The optimal transformer substation voltage control system based on the daily voltage qualification rate theory is characterized by comprising a data acquisition module, a low-voltage user daily voltage calculation module, a low-voltage user voltage data qualification rate calculation module and a transformer substation control module;
the data acquisition module configured to: obtaining the transformation ratio change of all public distribution transformers at all times in the day and the transformation ratio of the 10kV bus voltage of the transformer substation;
the low-voltage user daily voltage calculation module is configured to: sequentially determining the low-voltage user voltage at all times in the day through the change ratio change and the voltage change ratio; when the low-voltage user voltage at all moments is determined, the low-voltage user voltage interfered by the grid connection of the distributed power supply is eliminated;
the low-voltage user voltage data yield calculation module is configured to: calculating and comparing the qualified rate of the corresponding low-voltage user voltage at all moments, and determining the maximum qualified rate value;
the substation control module is configured to: and controlling the transformer substation according to the voltage amplitude of the 10kV bus of the transformer substation corresponding to the moment with the maximum qualified rate value and the transformation ratio of all public distribution transformers.
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